U.S. patent application number 17/635278 was filed with the patent office on 2022-09-15 for multi-compartment retort package.
The applicant listed for this patent is AMCOR FLEXIBLES NORTH AMERICA, INC.. Invention is credited to Kevin D. Glaser, James R. Lames, Carol W. Umphlett.
Application Number | 20220289458 17/635278 |
Document ID | / |
Family ID | 1000006416497 |
Filed Date | 2022-09-15 |
United States Patent
Application |
20220289458 |
Kind Code |
A1 |
Lames; James R. ; et
al. |
September 15, 2022 |
MULTI-COMPARTMENT RETORT PACKAGE
Abstract
A retortable package includes a body defining a perimeter and a
peripheral seal formed along the perimeter of the body. The
peripheral seal includes at least one peripheral self-venting
region and at least one peripheral non-venting region. The
retortable package further includes an intermediate seal formed
within the perimeter of the body and contiguous with the peripheral
seal. The intermediate seal divides the body into two compartments.
The compartments receive respective products therein. Upon heating
of the products, the intermediate seal ruptures before the at least
one peripheral self-venting region ruptures. Further, the at least
one peripheral self-venting region ruptures before the at least one
peripheral non-venting region ruptures.
Inventors: |
Lames; James R.; (Appleton,
WI) ; Glaser; Kevin D.; (Appleton, WI) ;
Umphlett; Carol W.; (Appleton, WI) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
AMCOR FLEXIBLES NORTH AMERICA, INC. |
Neenah |
WI |
US |
|
|
Family ID: |
1000006416497 |
Appl. No.: |
17/635278 |
Filed: |
September 17, 2019 |
PCT Filed: |
September 17, 2019 |
PCT NO: |
PCT/US2019/051538 |
371 Date: |
February 14, 2022 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B65D 81/3266 20130101;
B65D 81/3461 20130101; B65D 2205/00 20130101; B65D 2581/3494
20130101 |
International
Class: |
B65D 81/32 20060101
B65D081/32; B65D 81/34 20060101 B65D081/34 |
Claims
1. A retortable package comprising: a body defining a perimeter; a
peripheral seal formed along the perimeter of the body, the
peripheral seal comprising at least one peripheral self-venting
region and at least one peripheral non-venting region; and an
intermediate seal formed within the perimeter of the body and
contiguous with the peripheral seal, the intermediate seal dividing
the body into two compartments, the compartments receiving
respective products therein; wherein the intermediate seal further
comprises at least one intermediate self-venting region and at
least one intermediate non-venting region; wherein the least one
intermediate self-venting region protrudes inwardly into one of the
compartments relative to the at least one intermediate non-venting
region of the intermediate seal; and wherein, upon heating of the
products, the intermediate seal ruptures before the at least one
peripheral self-venting region ruptures, wherein the at least one
peripheral self-venting region ruptures before the at least one
peripheral non-venting region ruptures and, the at least one
intermediate self-venting region ruptures before the at least one
intermediate non-venting region ruptures.
2-3. (canceled)
4. The retortable package of claim 1, wherein a minimum width of
the at least one intermediate self-venting region is less than a
minimum width of the at least one intermediate non-venting
region.
5. The retortable package of claim 1, wherein the at least one
intermediate self-venting region is V-shaped or curved.
6. The retortable package of claim 1, wherein the body further
comprises a top edge, a bottom edge, and a pair of side edges
connecting the top and bottom edges, wherein the body further
defines a longitudinal axis extending between the top edge and the
bottom edge.
7. The retortable package of claim 6, wherein the intermediate seal
is parallel to the longitudinal axis of the body.
8. The retortable package of claim 6, wherein the intermediate seal
is perpendicular to the longitudinal axis of the body.
9. The retortable package of claim 6, wherein the intermediate seal
is inclined obliquely to the longitudinal axis of the body.
10. The retortable package of claim 1, wherein the peripheral seal
comprises two peripheral self-venting regions disposed adjacent to
one of the compartments.
11. The retortable package of claim 1, wherein each of the two
compartments is adjacent to a peripheral self-venting region.
12. A retortable package comprising: a body defining a perimeter; a
peripheral seal formed along the perimeter of the body, the
peripheral seal comprising at least one peripheral self-venting
region and at least one peripheral non-venting region; and an
intermediate seal formed within the perimeter of the body and
contiguous with the peripheral seal, the intermediate seal dividing
the body into two compartments, the compartments receiving
respective products therein; wherein, upon heating of the products,
the intermediate seal ruptures before the at least one peripheral
self-venting region ruptures, wherein the at least one peripheral
self-venting region ruptures before the at least one peripheral
non-venting region ruptures; wherein the body further comprises a
gusset fold, the gusset fold forming a first folded region and a
second folded region, and wherein the intermediate seal further
comprises a main portion disposed above the gusset fold, a first
branch portion disposed in the first folded region, and a second
branch portion disposed in the second folded region.
13. (canceled)
14. The retortable package of claim 1, wherein a width of the
intermediate seal is from 2 mm to 8 mm.
15. The retortable package of claim 1, wherein a width of the
peripheral seal is greater than 6 mm.
16. The retortable package of claim 1, wherein the peripheral seal
has a peel strength of greater than 2500 gram-force/inch.
17. The retortable package of claim 1, wherein at least 50% of a
length of the intermediate seal ruptures upon heating of the
products.
18. (canceled)
19. A retortable package comprising: a body defining a perimeter,
the body comprising a gusset fold forming a first folded region and
a second folded region; a peripheral seal formed along the
perimeter of the body, the peripheral seal comprising at least one
peripheral self-venting region and at least one peripheral
non-venting region, wherein the peripheral seal is at least
partially peelable; and an intermediate seal formed within the
perimeter of the body and contiguous with the peripheral seal, the
intermediate seal dividing the body into two compartments, the
compartments receiving respective products therein, wherein the
intermediate seal further comprises a main portion disposed above
the gusset fold, a first branch portion disposed in the first
folded region, and a second branch portion disposed in the second
folded region; wherein, upon heating of the products, the
intermediate seal ruptures before the at least one peripheral
self-venting region ruptures, wherein the at least one peripheral
self-venting region ruptures before the at least one peripheral
non-venting region ruptures.
Description
TECHNICAL FIELD
[0001] The present application relates generally to
multi-compartment packages, and to self-venting retortable packages
and packaged products including those packages.
BACKGROUND
[0002] Retort operations are used for the sterilization and thermal
processing of food or other products contained within its primary
packaging components. Food packed in a retort package, such as a
pouch, is transferred to an autoclave where it is subjected to
temperatures generally exceeding the boiling point of water for an
extended period. The autoclave process also uses over-pressure to
complete the sterilization step.
[0003] Conventional packages meant for use in microwave ovens
cannot tolerate retort conditions without seal failure or other
detrimental effects. Some containers, known to withstand retort
conditions, cannot adequately vent internal pressures arising from
microwave heating, or at least not in a controlled manner.
Inadequate venting may cause sudden, undesirable bursting of the
container and loss/splattering of its contents.
[0004] In certain applications, a packaged product that contains
more than one type of food item is desirable. However, retorting a
combination of two food items can adversely affect a quality of the
final product. Therefore, mixing of the food items prior to the
retort sterilization process is not desirable. Conventional
containers typically require a user to manually open a portion of
the package and then mix the food items, either prior to or after
microwave heating.
SUMMARY
[0005] A multi-compartment retortable package has been developed
that can be used to package two products without mixing. The
retortable package can maintain seal strength even after being
subjected to retort conditions. After retorting, the package can be
subjected to microwave heating during which the two products
combine. The two products are combined without any manual
intervention. Further, the retortable package may vent but does not
fail or disintegrate upon microwave heating.
[0006] One embodiment of the retortable package includes a body
defining a perimeter and a peripheral seal formed along the
perimeter of the body. The peripheral seal includes at least one
peripheral self-venting region and at least one peripheral
non-venting region. The peripheral seal is at least partially
peelable. The retortable package further includes an intermediate
seal formed within the perimeter of the body and contiguous with
the peripheral seal. The intermediate seal divides the body into
two compartments. The compartments receive respective products
therein. Upon heating of the products, the intermediate seal
ruptures before the at least one peripheral self-venting region
ruptures. Further, the at least one peripheral self-venting region
ruptures before the at least one peripheral non-venting region
ruptures.
[0007] In some embodiments, the intermediate seal further includes
at least one intermediate self-venting region and at least one
intermediate non-venting region. The at least one intermediate
self-venting region ruptures before the at least one intermediate
non-venting region ruptures.
[0008] In some embodiments, the least one intermediate self-venting
region protrudes inwardly into one of the compartments relative to
the at least one intermediate non-venting region of the
intermediate seal.
[0009] In some embodiments, a minimum width of the at least one
intermediate self-venting region is less than a minimum width of
the at least one intermediate non-venting region.
[0010] In some embodiments, the at least one intermediate
self-venting region is V-shaped or curved.
[0011] In some embodiments, the body further includes a top edge, a
bottom edge, and a pair of side edges connecting the top and bottom
edges. The body further defines a longitudinal axis extending
between the top edge and the bottom edge.
[0012] In some embodiments, the intermediate seal is parallel to
the longitudinal axis of the body.
[0013] In some embodiments, the intermediate seal is perpendicular
to the longitudinal axis of the body.
[0014] In some embodiments, the intermediate seal is inclined
obliquely to the longitudinal axis of the body.
[0015] In some embodiments, the peripheral seal includes two
peripheral self-venting regions disposed adjacent to one of the
compartments.
[0016] In some embodiments, the peripheral seal includes two
peripheral self-venting regions. Each peripheral self-venting
region is disposed adjacent to a respective compartment from the
two compartments.
[0017] In some embodiments, the body further includes a gusset
fold. The gusset fold forms a first folded region and a second
folded region.
[0018] In some embodiments, the intermediate seal further includes
a main portion disposed above the gusset fold, a first branch
portion disposed in the first folded region, and a second branch
portion disposed in the second folded region.
[0019] In some embodiments, a width of the intermediate seal is
from about 2 mm to about 8 mm.
[0020] In some embodiments, a width of the peripheral seal is
greater than about 6 mm.
[0021] In some embodiments, the peripheral seal has a peel strength
of greater than about 2500 gram-force/inch.
[0022] In some embodiments, at least 50% of a length or an area of
the intermediate seal ruptures upon heating of the products.
[0023] One embodiment of a packaged product includes a retortable
package. The retortable package includes a body defining a
perimeter and a peripheral seal formed along the perimeter of the
body. The peripheral seal includes at least one peripheral
self-venting region and at least one peripheral non-venting region.
The peripheral seal is at least partially peelable. The retortable
package further includes an intermediate seal formed within the
perimeter of the body and contiguous with the peripheral seal. The
intermediate seal divides the body into a first compartment and a
second compartment sealed from the first compartment. The packaged
product further includes a first product received within the first
compartment and a second product received within the second
compartment. Upon heating of the first and second products, at
least 50% of a length or an area of the intermediate seal ruptures
and the first and second products mix together. The intermediate
seal ruptures before the at least one peripheral self-venting
region ruptures. Further, the at least one peripheral self-venting
region ruptures before the at least one peripheral non-venting
region ruptures.
[0024] In some embodiments, the first product and the second
product have different water contents.
[0025] In some embodiments, the first compartment and the second
compartment have different volumes.
[0026] One embodiment of a retortable package includes a body
defining a perimeter and a peripheral seal formed along the
perimeter of the body. The body includes a gusset fold forming a
first folded region and a second folded region. The peripheral seal
includes at least one peripheral self-venting region and at least
one peripheral non-venting region. The peripheral seal is at least
partially peelable. The retortable package further includes an
intermediate seal formed within the perimeter of the body and
contiguous with the peripheral seal. The intermediate seal divides
the body into two compartments. The compartments receive respective
products therein. The intermediate seal further includes a main
portion disposed above the gusset fold, a first branch portion
disposed in the first folded region, and a second branch portion
disposed in the second folded region. Upon heating of the products,
the intermediate seal ruptures before the at least one peripheral
self-venting region ruptures. Further, the at least one peripheral
self-venting region ruptures before the at least one peripheral
non-venting region ruptures.
[0027] There are several aspects of the present subject matter
which may be embodied separately or together. These aspects may be
employed alone or in combination with other aspects of the subject
matter described herein, and the description of these aspects
together is not intended to preclude the use of these aspects
separately or the claiming of such aspects separately or in
different combinations.
BRIEF DESCRIPTION OF THE DRAWINGS
[0028] The disclosure may be more completely understood in
consideration of the following detailed description of various
embodiments of the disclosure in connection with the accompanying
drawings, in which:
[0029] FIG. 1A is a schematic plan view of a container;
[0030] FIG. 1B is a schematic sectional view of the container taken
along a line A-A' in FIG. 1A;
[0031] FIGS. 2A-2D depict an exemplary use of a packaged
product;
[0032] FIG. 3A is a schematic plan view of a container;
[0033] FIG. 3B is a schematic sectional view of the container taken
along a line B-B' in FIG. 3A.
[0034] FIG. 3C is a schematic sectional view of the container taken
along a line E-E' in FIG. 3A.
[0035] FIG. 4A is a schematic plan view of a container;
[0036] FIG. 4B is a schematic sectional view of the container taken
along a line C-C' in FIG. 4A;
[0037] FIG. 5A is a schematic plan view of a container;
[0038] FIG. 5B is a schematic sectional view of the container taken
along a line D-D' in FIG. 5A; and
[0039] FIGS. 6A-6D depict various self-venting regions that are
suitable for containers described herein.
[0040] The drawings show some but not all embodiments. The elements
depicted in the drawings are illustrative and not necessarily to
scale, and the same (or similar) reference numbers denote the same
(or similar) features throughout the drawings.
DETAILED DESCRIPTION
[0041] The present application describes a retortable package and a
packaged product including the retortable package. The retortable
package includes a body defining a perimeter and a peripheral seal
formed along the perimeter of the body. The peripheral seal
includes at least one peripheral self-venting region and at least
one peripheral non-venting region. The peripheral seal is at least
partially peelable. The retortable package further includes an
intermediate seal formed within the perimeter of the body and
contiguous with the peripheral seal. The intermediate seal divides
the body into two compartments. The compartments receive respective
products therein. Upon heating of the products, the intermediate
seal ruptures before the at least one peripheral self-venting
region ruptures. Further, the at least one peripheral self-venting
region ruptures before the at least one peripheral non-venting
region ruptures.
[0042] The intermediate seal ruptures due to an increase in
pressure within one or both compartments. Such pressure is normally
attained upon heating the retortable package in a microwave oven to
bring the product therein to a sufficient temperature to vaporize
water or ice in the packaged products and/or cause significant
expansion of the enclosed gases. Rupture of the intermediate seal
allows the products to combine. The retortable package may
therefore enable mixing of the products without any manual
intervention. The intermediate seal ruptures before the one or more
peripheral self-venting regions rupture. This preferential rupture
sequence can be achieved by geometry (e.g., an inward protrusion),
seal width (e.g., less seal width), sealing conditions (e.g., lower
sealing temperature, time and/or pressure), design of the
compartments, and/or properties of the products (e.g., water
content). After the rupture of the intermediate seal, venting of
gases may occur at the peripheral self-venting regions. The
peripheral self-venting regions can allow a controlled release of
internal pressure, thereby avoiding sudden, undesirable bursting of
the retortable package and loss/splattering of its contents. The
retortable package can also be subject to retort conditions without
compromising the integrity of the intermediate seal and the
peripheral seal.
[0043] FIGS. 1A and 1B each depict an exemplary self-venting
retortable package 100 (hereinafter referred to as "package 100")
including a body 102 defining a perimeter 104. Package 100 further
includes a peripheral seal 106 formed along perimeter 104 of body
102. Body 102 further includes a top edge 104A, a bottom edge 104B,
and a pair of side edges 104C connecting top and bottom edges 104A,
104B. Body 102 further defines a longitudinal axis "LA1" extending
between top edge 104A and bottom edge 104B. Each of top edge 104A,
bottom edge 104B, and side edges 104C may be linear, curved, or a
combination of both. Peripheral seal 106 therefore extends along
top edge 104A, bottom edge 104B and side edges 104C. In some
embodiments of the retortable package, the peripheral seal 106
extends along top edge 104A and side edges 104C, and bottom edge
104B comprises a fold in the body material. The peripheral seal 106
may extend along the perimeter 104, exactly on the edges or
slightly offset from one or more of the edges.
[0044] Peripheral seal 106 may be formed from heating and
compressing overlapping layers of multilayer films at perimeter 104
of body 102. For example, peripheral seal 106 may be formed from
heat sealing overlapping portions of a single multilayer film,
separate multilayer films, or a multilayer film and a package
bottom that may be formed of a rigid or flexible plastic
material.
[0045] Peripheral seal 106 includes at least one peripheral
self-venting region 106A and at least one peripheral non-venting
region 106B. As shown in FIG. 1A, peripheral seal 106 includes two
peripheral self-venting regions 106A and two peripheral non-venting
regions 106B. Peripheral self-venting regions 106A are
interchangeably referred to as self-venting regions 106A.
Similarly, peripheral non-venting regions 106B are interchangeably
referred to as non-venting regions 106B. Each non-venting region
106B is continuous. In FIG. 1A, self-venting regions 106A is
located on respective side edges 104C of body 102. However, number
and location of self-venting regions 106A may be varied as per
application requirements.
[0046] Self-venting regions 106A and non-venting regions 106B may
have different seal shapes or geometries, seal widths and/or
sealing conditions (sealing time, temperature, pressure etc.). Seal
width may be measured along a width dimension that is perpendicular
to perimeter 104 of body 102 along which peripheral seal 106
extends. In FIG. 1A, each self-venting region 106A may have a
curved shape, for example, a partial circle (such as a
semi-circle), or a partial ellipse (such as a semi-ellipse). In
alternative embodiments, each self-venting region 106A may be
V-shaped. Further, each non-venting region 106B is substantially
linear along its length.
[0047] According to representative embodiments, a width "W1" of
peripheral seal 106 is greater than about 6 mm. Width "W1" of
peripheral seal 106 may be substantially constant or vary along
perimeter 104. For example, a minimum width of each self-venting
region 106A may be less than or equal to a minimum width of each
non-venting region 106B. Further, peripheral seal 106 is at least
partially peelable. For example, peripheral seal 106 is at least
peelable at top edge 104A of body 102. According to representative
embodiments, peripheral seal 106 has a peel strength of greater
than about 2500 gram-force/inch.
[0048] Body 102 further includes a gusset fold 108 (indicated with
a horizontal dashed line in FIG. 1A) at a level near bottom edge
104B of body 102. Gusset fold 108 may extend substantially
perpendicular to longitudinal axis "LA1" of body 102. Further,
gusset fold 108 may be substantially parallel to bottom edge 104B.
As shown in FIG. 1B, gusset fold 108 forms a first folded region
110A and a second folded region 110B. Gusset fold 108 may be
inserted to provide a specific package type, namely a gusseted
pouch, having the capability of being free standing. In general,
however, aspects of the application discussed herein are broadly
applicable to a wide variety of package types, including pouches
having at least one, and preferably at least two, peripheral heat
seals. In addition to stand-up pouches, pillow pouches are also
representative.
[0049] Package 100 further includes an intermediate seal 112 formed
within perimeter 104 of body 102 and contiguous with peripheral
seal 106. Intermediate seal 112 divides body 102 into two
compartments 114A, 114B. Compartments 114A, 114B receive respective
products therein. As shown in FIG. 1A, intermediate seal 112 is
perpendicular to longitudinal axis "LA1" of body 102. Compartment
114A is positioned between top edge 104A and intermediate seal 112,
while compartment 114B is positioned between intermediate seal 112
and bottom edge 104B. Compartment 114A may be interchangeably
referred to as a first compartment 114A, while compartment 114B may
be interchangeably referred to as a second compartment 114B.
Therefore, intermediate seal 112 divides body 102 into first
compartment 114A and second compartment 114B sealed from first
compartment 114A. In some embodiments, first and second
compartments 114A, 114B have different volumes. In alternative
embodiments, first and second compartments 114A, 114B have
substantially similar volumes. As shown in FIG. 1A, two peripheral
self-venting regions 106A are disposed adjacent to one of
compartments 114A, 114B, i.e., first compartment 114A. However, in
alternative embodiments, each self-venting region 106A may be
disposed adjacent to a respective compartment 114A or 114B from two
compartments 114A, 114B. In other words, venting may be provided in
each of first and second compartments 114A, 114B. Self-venting
regions 106A protrude inwardly into compartment 114A relative to
non-venting regions 106B.
[0050] In some embodiments, a first product is received within
first compartment 114A. A second product in received within second
compartment 114B. In some embodiments, the first product and the
second product have different water contents. Package 100 along
with first and second products received within first and second
compartments 114A, 114B, respectively, form a packaged product. The
packaged product may be subject to retort conditions for
sterilization of first and second products. Body 102, peripheral
seal 106 and intermediate seal 112 may be configured to withstand
retort conditions and microwave cooking without delamination,
separation or degradation. Specifically, intermediate seal 112 and
peripheral seal 106 may not include any film layer that melts under
temperatures typically encountered in retort processing.
[0051] Intermediate seal 112 is further positioned between top edge
104A and gusset fold 108. Intermediate seal 112 further extends
between side edges 104C. In some embodiments, intermediate seal 112
may be positioned mid-way between top and bottom edges 104A, 104B.
However, the position of intermediate seal 112 may vary as per
application requirements. In some alternative embodiments,
intermediate seal 112 may be substantially parallel to longitudinal
axis "LA1" of body 102. In yet other embodiments, intermediate seal
112 may be inclined obliquely to longitudinal axis "LA1" of body
102. According to the embodiment of FIG. 1A, intermediate seal 112
is substantially linear. Further, a width "W2" of intermediate seal
112 is substantially constant along its length. In alternative
embodiments, width "W2" of intermediate seal 112 may vary along its
length. According to representative embodiments, width "W2" of
intermediate seal 112 is from about 2 mm to about 8 mm. In some
embodiments, width "W2" of intermediate seal 112 is less than width
"W1" of peripheral seal 106.
[0052] Intermediate seal 112 may have various alternative
configurations. In alternative embodiments, intermediate seal 112
may further include at least one intermediate self-venting region
(not shown in FIGS. 1A and 1B) and at least one intermediate
non-venting region. The at least one intermediate self-venting
region and the at least one intermediate non-venting region may
have different seal shapes or geometries, seal widths and/or
sealing conditions (sealing time, temperature, pressure etc.). The
at least one intermediate self-venting region may protrude inwardly
into one of compartments 114A, 114B relative to the at least one
intermediate non-venting region of the intermediate seal. Further,
a minimum width of the at least one intermediate self-venting
region may be less than a minimum width of the at least one
intermediate non-venting region. The at least one intermediate
self-venting region may be V-shaped or curved. In cases where
intermediate seal 112 intersects gusset fold 108, intermediate seal
112 may further include a main portion (not shown in FIGS. 1A and
1B) disposed above gusset fold 108, a first branch portion disposed
in first folded region 110A, and a second branch portion disposed
in second folded region 110B.
[0053] Intermediate seal 112 may be formed from heating and
compressing overlapping layers of multilayer films of body 102. For
example, intermediate seal 112 may be formed from heat sealing
overlapping portions of a single multilayer film or separate
multilayer films.
[0054] Upon heating of the products received within first and
second compartments 114A, 114B, intermediate seal 112 ruptures
before at least one peripheral self-venting region 106A ruptures.
In cases where intermediate seal 112 includes an intermediate
self-venting region, the intermediate self-venting region may
rupture before the intermediate non-venting region ruptures.
Further, at least one peripheral self-venting region 106A ruptures
before at least one peripheral non-venting region 106B. In other
words, intermediate seal 112 ruptures before self-venting regions
106A rupture. Self-venting regions 106A rupture before non-venting
regions 106B rupture. Preferably, non-venting regions 106B do not
rupture due to product heating.
[0055] Heating of package 100 in a microwave oven may vaporize
water or ice in products received within first and second
compartments 114A, 114B and/or cause significant expansion of
enclosed gases. Pressure within one or both of the first and second
compartments 114A, 114B may therefore increase and cause rupture of
intermediate seal 112 first. In some embodiments, at least 50% of a
length or an area of intermediate seal 112 ruptures upon heating of
the products. In some other embodiments, at least 60%, 70%, 80% or
90% of the length or the area of intermediate seal 112 ruptures
upon heating of the products. The rupture of intermediate seal 112
to a certain extent (e.g., at least 50%) may enable mixing of
products received within first and second compartments 114A, 114B.
Peripheral self-venting regions 106A may rupture next and allow
venting of pressure within body 102. Further, the mixed products
can continue to be heated without significant disruption, splatter,
and/or loss. After heating is completed, the peripheral seal 106 at
the top edge 104A of body 102 may be peeled open manually to gain
access to the mixed products. Top edge 104A of body 102 may be torn
off to gain access to the mixed products.
[0056] Package 100 is self-venting, meaning that gases can escape
package 100, preferably in a controlled manner, when a threshold
pressure (e.g., from about 2 psig to about 5 psig) is reached
within package 100. Such a pressure is normally attained upon
heating package 100 in a microwave oven to a sufficient temperature
to vaporize water or ice in the packaged products and/or cause
significant expansion of the enclosed gases. The escape of gases
upon heating preferably occurs at self-venting regions 106A having
a particular construction (e.g., in terms of seal width) and
geometry (e.g., an inward protrusion) that can be varied to adjust
the venting characteristics, including the threshold pressure, as
well as the direction and even velocity of the escaping vapors.
[0057] FIGS. 2A-2D show exemplary use of a packaged product 200
including package 100 of FIGS. 1A and 1B. Referring to FIGS. 1A-IB
and 2A-2D, packaged product 200 includes package 100, a first
product 202 received within first compartment 114A, and a second
product 204 received within second compartment 114B. First and
second products 202, 204 may be food products. As a non-limiting
example, first product 202 is a sauce (e.g., red sauce) and second
product 204 is pasta. Alternatively, first product 202 may be pasta
and second product 204 may be sauce. Packaged product 200 may be
subject to retort conditions in order to sterilize first and second
products 202, 204. First and second products 202, 204 may be
shelf-stable due to retorting and not require refrigeration before
use. Retorting may occur within an autoclave where packaged product
200 is subjected to temperatures generally exceeding the boiling
point of water for an extended period. The autoclave may apply an
opposing, external pressure that balances an internal pressure
exerted by first and second products 202, 204. Peripheral seal 106
and intermediate seal 112 may therefore remain intact during retort
process.
[0058] After retorting, packaged product 200 may be placed in a
microwave oven. During the microwave heating process, first and
second products 202, 204 may be heated and generate steam that
causes first and second compartments 114A, 114B to expand as there
is no external pressure inside the microwave oven to counteract the
internal pressure of the package. Residual gas inside first and
second compartments 114A, 114B may also expand and apply pressure.
Expansion of first and second compartments 114A, 114B is
schematically shown in FIG. 2A. As shown in FIG. 2B, intermediate
seal 112 ruptures first, due to the expansion of first and/or
second compartments 114A, 114B. A rate of expansion may depend on
various factors, for example, amount of first and second products
202, 204, the volumes of first and second compartments 114A, 114B,
water contents of first and second products 202, 204 and an amount
of residual gas in each of first and second compartments 114A,
114B. The expansion of first and second compartments 114A, 114B may
cause intermediate seal 112 to at least partially open. For
example, at least 50% of the length or the area of intermediate
seal 112 ruptures and first and second products 202, 204 mix
together. In other examples, at least 60%, 70%, 80% or 90% of the
length or the area of intermediate seal 112 ruptures. Opening of
intermediate seal 112 may allow first product 202 (i.e., sauce) to
fall on top of second product 204 (i.e., pasta). This may cause
first and second products 202, 204 to mix together. In some cases,
a weight of first product 202 may fully open intermediate seal
112.
[0059] In some cases, second compartment 114B may have a design
and/or food content (e.g., high water content) that causes a larger
pressure build-up in second compartment 114B than first compartment
114A. This may ensure that intermediate seal 112 ruptures before
self-venting regions 106A.
[0060] After first and second products 202, 204 are mixed, a
resultant mixture 206 may continue to be heated causing package 100
to expand. This may apply pressure on self-venting regions 106A. As
shown in FIG. 2C, self-venting regions 106A rupture due to pressure
build-up inside package 100. Mixture 206 can cook further for a
remainder of the microwave heating process without disintegration
of package 100. As shown in FIG. 2D, peripheral seal 106 at top
edge 104A of package 100 may be manually peeled after microwave
heating to gain access to the cooked mixture 206. Alternatively,
the a portion of the package may be removed via tearing, for
example at a tear notch, allowing access to the mixture 206.
[0061] The mixing of first and second products 202, 204 and venting
of package 100, upon exposure to sufficient microwave heating, can
therefore be achieved in a controlled and desirable manner, without
significant disruption, splatter, and/or loss of the package
contents, to the benefit of the end user. Mixing and venting may be
based on a more controllable mechanical, rather than thermal,
breakage of intermediate seal 112 and peripheral seal 106. Further,
as discussed above, intermediate seal 112 and peripheral seal 106
may not include any film layer that melts under temperatures
typically encountered in microwave cooking or in retort processing.
Intermediate seal 112 may rupture first at a first threshold
pressure, while self-venting regions 106A may rupture next at a
second threshold pressure greater than the first threshold
pressure.
[0062] Packaged product 200 including package 100 may also allow
first and second products 202, 204 to be sealed from one another
before the microwave heating process. This may be desirable in
applications where retorting a combination of two products can
adversely impact a quality of the final product (i.e., cooked
combination). Thus, package 100 may allow two products to be
combined during microwave heating while still maintaining desirable
properties (e.g., texture, taste etc.) of the final product.
Packaged product 200 may also not require refrigeration before use
due to retorting. The end user may be only required to put packaged
product 200 inside a microwave oven and initiate the microwave
heating process.
[0063] FIGS. 3A, 3B and 3C illustrate a retortable package 300
(hereinafter referred to as "package 300") according to another
embodiment of the present application. Package 300 includes a body
302 defining a perimeter 304. Package 300 further includes a
peripheral seal 306 formed along perimeter 304 of body 302. Body
302 further includes a top edge 304A, a bottom edge 304B, and a
pair of side edges 304C connecting top and bottom edges 304A, 304B.
Body 302 further defines a longitudinal axis "LA2" extending
between top edge 304A and bottom edge 304B. Each of top edge 304A,
bottom edge 304B, and side edges 304C may be linear, curved, or a
combination of both. Peripheral seal 306 therefore extends along
top edge 304A, bottom edge 304B and side edges 304C. Peripheral
seal 306 includes two peripheral self-venting regions 306A and two
peripheral non-venting regions 306B.
[0064] Body 302 further includes a gusset fold 308 (indicated with
a horizontal dashed line in FIG. 3A) at a level near bottom edge
304B of body 302. Gusset fold 308 may extend substantially
perpendicular to longitudinal axis "LA2" of body 302. Further,
gusset fold 308 may be substantially parallel to bottom edge 304B.
As shown in FIG. 3C, gusset fold 308 forms a first folded region
310A and a second folded region 310B.
[0065] Package 100 further includes an intermediate seal 312 formed
within perimeter 304 of body 302 and contiguous with peripheral
seal 306. Intermediate seal 312 divides body 302 into two
compartments 314A, 314B. Compartments 314A, 314B receive respective
products therein. Intermediate seal 312 is parallel to longitudinal
axis "LA2" of body 302. Intermediate seal 312 extends from top edge
304A to bottom edge 304B. Each of compartments 314A, 314B is
positioned between respective side edge 304C and intermediate seal
312. Each peripheral self-venting region 306A is disposed adjacent
to a respective compartment 314A, 314B.
[0066] Intermediate seal 312 further includes an intermediate
self-venting region 312A and two intermediate non-venting regions
312B separated by intermediate self-venting region 312A.
Intermediate self-venting region 312A and each intermediate
non-venting region 312B may have different seal shapes or
geometries, seal widths and/or sealing conditions (sealing time,
temperature, pressure etc.). Intermediate self-venting region 312A
protrudes inwardly into compartment 314A relative to intermediate
non-venting regions 312B of intermediate seal 312. In some
embodiments, a minimum width of intermediate self-venting region
312A may be less than a minimum width of each intermediate
non-venting region 312B. As shown in FIG. 3A, intermediate
self-venting region 312A is V-shaped. In alternative embodiments,
intermediate self-venting region 312A may be curved. Further,
intermediate self-venting region 312A is an off-center feature and
is located proximate top edge 304A. However, a position of
intermediate self-venting region 312A may vary along a length of
intermediate seal 312. In an alternative embodiment, intermediate
self-venting region 312A may be centrally located along
intermediate seal 312.
[0067] Intermediate seal 312 intersects gusset fold 308.
Intermediate seal 312 may have to be present on both sides of
gusset fold 308 in order to seal compartments 314A 314B from each
other. Referring to FIGS. 3B and 3C, intermediate seal 312 further
includes a main portion 315 disposed above gusset fold 308, a first
branch portion 316 in first folded region 310A, and a second branch
portion 318 disposed in second folded region 310B. Intermediate
seal 312 may have a substantially Y-shaped configuration. First and
second branch portions 316, 318 seal compartments 314A, 314B from
each other in first and second folded region 310A, 310B,
respectively. Main portion 315 may be linear or curved. Similarly,
each of first and second branch portions 316, 318 may be linear or
curved.
[0068] Upon heating of the products, intermediate seal 312 ruptures
before peripheral self-venting regions 306A rupture. Further,
intermediate self-venting region 312A ruptures before intermediate
non-venting regions 312B rupture. Rupture of intermediate seal 312
may start at intermediate self-venting region 312A. Subsequently,
at least 50% of a length or an area of intermediate seal 312 may
open to allowing mixing of the products.
[0069] FIGS. 4A and 4B illustrate a retortable package 400
(hereinafter referred to as "package 400") according to another
embodiment of the present application. Package 400 includes a body
402 defining a perimeter 404. Package 400 further includes a
peripheral seal 406 formed along perimeter 404 of body 402. Body
402 further includes a top edge 404A, a bottom edge 404B, and a
pair of side edges 404C connecting top and bottom edges 404A, 404B.
Body 402 further defines a longitudinal axis "LA3" extending
between top edge 404A and bottom edge 404B. Each of top edge 404A,
bottom edge 404B, and side edges 404C may be linear, curved, or a
combination of both. Peripheral seal 406 therefore extends along
top edge 404A, bottom edge 404B and side edges 404C. Peripheral
seal 406 includes a peripheral self-venting region 406A disposed on
one side edge 404C and two peripheral non-venting regions 406B
separated by peripheral self-venting region 406A.
[0070] Body 402 further includes a gusset fold 408 (indicated with
a horizontal dashed line in FIG. 4A) at a level near bottom edge
404B of body 402. Gusset fold 408 may extend substantially
perpendicular to longitudinal axis "LA3" of body 402. Further,
gusset fold 408 may be substantially parallel to bottom edge 404B.
As shown in FIG. 4B, gusset fold 408 forms a first folded region
410A and a second folded region 410B.
[0071] Package 400 further includes an intermediate seal 412 formed
within perimeter 404 of body 402 and contiguous with peripheral
seal 406. Intermediate seal 412 divides body 402 into two
compartments 414A 414B. Compartments 414A, 414B receive respective
products therein. Intermediate seal 412 is inclined obliquely to
longitudinal axis "LA3" of body 402. An angle "A1" between
intermediate seal 412 and longitudinal axis "LA3" may be from about
20 degrees to about 70 degrees. Intermediate seal 412 extends
between side edges 404C. Peripheral self-venting region 406A is
disposed adjacent to compartment 414A.
[0072] Intermediate seal 412 further includes an intermediate
self-venting region 412A and two intermediate non-venting regions
412B separated by intermediate self-venting region 412A.
Intermediate self-venting region 412A and each intermediate
non-venting region 412B may have different seal shapes or
geometries, seal widths and/or sealing conditions (sealing time,
temperature, pressure etc.). Intermediate self-venting region 412A
protrudes inwardly into compartment 414A relative to intermediate
non-venting regions 412B of intermediate seal 412. In some
embodiments, a minimum width of intermediate self-venting region
412A may be less than a minimum width of each intermediate
non-venting region 412B. As shown in FIG. 4A, intermediate
self-venting region 412A is curved. In alternative embodiments,
intermediate self-venting region 412A may be V-shaped. Further,
intermediate self-venting region 412A may be centrally located
along intermediate seal 412.
[0073] Upon heating of the products, intermediate seal 412 ruptures
before peripheral self-venting regions 406A rupture. Further,
intermediate self-venting region 412A ruptures before intermediate
non-venting regions 412B rupture. Rupture of intermediate seal 412
may start at intermediate self-venting region 412A. Subsequently,
at least 50% of a length or an area of intermediate seal 412 may
open to allowing mixing of the products.
[0074] FIGS. 5A and 5B illustrate a retortable package 500
(hereinafter referred to as "package 500") according to another
embodiment of the present application. Package 500 includes a body
502 defining a perimeter 504. Package 500 further includes a
peripheral seal 506 formed along perimeter 504 of body 502. Body
502 further includes a top edge 504A, a bottom edge 504B, and a
pair of side edges 504C connecting top and bottom edges 504A, 504B.
Body 502 further defines a longitudinal axis "LA4" extending
between top edge 504A and bottom edge 504B. Each of top edge 504A,
bottom edge 504B, and side edges 504C may be linear, curved, or a
combination of both. Peripheral seal 506 therefore extends along
top edge 504A, bottom edge 504B and side edges 504C. Peripheral
seal 506 includes a peripheral self-venting region 506A disposed on
one side edge 504C and two peripheral non-venting regions 506B
separated by peripheral self-venting region 506A.
[0075] Body 502 further includes a gusset fold 508 (indicated with
a horizontal dashed line in FIG. 5A) at a level near bottom edge
504B of body 502. Gusset fold 508 may extend substantially
perpendicular to longitudinal axis "LA4" of body 502. Further,
gusset fold 508 may be substantially parallel to bottom edge 504B.
As shown in FIG. 5B, gusset fold 508 forms a first folded region
510A and a second folded region 510B.
[0076] Package 500 further includes an intermediate seal 512 formed
within perimeter 504 of body 502 and contiguous with peripheral
seal 506. Intermediate seal 512 divides body 502 into two
compartments 514A, 514B. Compartments 514A, 514B receive respective
products therein. Intermediate seal 512 is inclined obliquely to
longitudinal axis "LA4" of body 502. An angle "A2" between
intermediate seal 512 and longitudinal axis "LA4" may be from about
20 degrees to about 70 degrees. Intermediate seal 512 extends from
top edge 504A to one side edge 504C. Peripheral self-venting region
506A is disposed adjacent to compartment 514B.
[0077] As shown in FIG. 5A, intermediate seal 512 is curved. Due to
the position and shape of intermediate seal 512, compartments 514A
and 514B have different shapes and volumes. Specifically, the
volume of compartment 514A is less than the volume of compartment
514B. Designs of compartments 514A, 514B may be such that there is
larger pressure build-up in one of compartments 514A 514B. This may
ensure that intermediate seal 512 ruptures before peripheral
self-venting region 506A. Upon heating of the products,
intermediate seal 512 ruptures before peripheral self-venting
regions 506A rupture. At least 50% of a length or an area of
intermediate seal 512 may open to allowing mixing of the
products.
[0078] FIGS. 6A-6D illustrate various embodiments of self-venting
regions. The self-venting regions may be incorporated in an
intermediate seal or a peripheral seal of a representative package
described above.
[0079] FIG. 6A illustrates a self-venting region 602A which is
V-shaped. Self-venting region 602A may protrude inwardly into a
compartment (not shown in FIG. 6A) relative to a non-venting region
604A.
[0080] FIG. 6B illustrates a self-venting region 602B which is
curved. Self-venting region 602B may be a partial circle (such as a
semi-circle), or a partial ellipse (such as a semi-ellipse).
Self-venting region 602B may protrude outwardly relative to a
non-venting region 604B.
[0081] FIG. 6C illustrates a self-venting region 602C which is
curved. Self-venting region 602C may be a partial circle (such as a
semi-circle), or a partial ellipse (such as a semi-ellipse).
Self-venting region 602C may protrude inwardly into a compartment
(not shown in FIG. 6C) relative to a non-venting region 604C.
[0082] FIG. 6D illustrates a self-venting region 602D. A minimum
width "W3" of self-venting region is less than a minimum width "W4"
of a non-venting region 604D.
[0083] Self-venting regions 602A, 602B, 602C, 602D may rupture
before corresponding non-venting regions 604A, 604B, 604C, 604D
rupture when the corresponding packages are heated.
[0084] Further aspects of the present application relate to
multilayer films used in forming one or both sides of the packages
described above, and particularly one or both sides of the
peripheral seal and the intermediate seal. The ability of such
films to withstand retort operations generally requires all film
layers to have a sufficiently high melting point. As noted above,
preferably such films do not include any film layer having a
melting temperature of less than about 900.degree. C. (194.degree.
F.), less than about 100.degree. C. (212.degree. F.), or even less
than about 110.degree. C. (230.degree. F.). In the case of film
layers including blends of polymers, the individual components of
the blends may have melting temperatures that do not meet these
requirements, as long as the blend itself has a sufficiently high
melting temperature.
[0085] In addition, the multilayer films, as well as packages
having such films, preferably have seal strength, stability, heat
resistance, and oxygen and water vapor transmission properties that
allow them to be subjected to retort conditions without loss of
desired functional characteristics.
[0086] For example, in the case of a representative retortable
package including a peripheral seal and an intermediate seal as
described above, even after conditions mimicking a retort heat
treatment, the package has a seal strength of the peripheral seal
and/or the intermediate seal generally from about 1,700 g/in (3.75
lb/in) to about 34,000 g/in (75 lb/in), and typically from about
3,400 g/in (7.5 lb/in) to about 13,600 g/in (30 lb/in), according
to ASTM-F88. Advantageously, high seal strength stability of the
package is also exhibited, based on a loss in seal strength of
generally less than about 35%, typically less than about 20%, and
often less than about 10%, upon being subjected to conditions
mimicking a retort heat treatment. Representative conditions
mimicking a retort heat treatment, corresponding to the above seal
strength and seal strength stability properties, include exposure
of the package to (1) a temperature of 110.degree. C. (230.degree.
F.) for 30 minutes, (2) a temperature of 110.degree. C.
(230.degree. F.) for 60 minutes, (3) a temperature of 135.degree.
C. (275.degree. F.) for 30 minutes, or (4) a temperature of
135.degree. C. (275.degree. F.) for 60 minutes. Furthermore,
multilayer films described herein also have acceptable heat
resistance, in terms of not undergoing delamination. Preferably, no
delamination of the film structure is observed after the film is
subjected to 100.degree. C. (212.degree. F.) for 30 minutes, or
even for 60 minutes. Further properties of representative films
include a barrier-oxygen transmission rate of generally from about
0.16 cc/m2/day (0.01 cc/100 in2/day) to about 62 cc/m2/day (4
cc/100 in2/day), and typically from about 0.16 cc/m2/day (0.01
cc/100 in2/day) to about 1.6 cc/m2/day (0.1 cc/100 in2/day) at a
temperature of 23.degree. C. (73.degree. F.), and/or a
barrier-water vapor transmission rate of generally from about 0.47
g/m2/day (0.03 g/100 in2/day) to about 7.8 g/m2/day (0.5 g/100
in2/day), and typically from about 0.47 g/m2/day (0.03 g/100
in2/day) to about 3.9 cc/m2/day (0.25 g/100 in2/day) at a
temperature of 100.degree. C. (212.degree. F.) and 90% relative
humidity.
[0087] The multilayer film includes a sealing layer that forms a
peripheral seal and an intermediate seal of the package, including
the self-venting and non-venting regions, as described above. In
regions where the multilayer film is sealed (e.g., by heat), this
sealing layer is bonded to a suitable base material, such as a
rigid or flexible package bottom, for example, including
polypropylene or polyethylene. The base material may also be
another multilayer film of the same type or of a different type.
For example, if the multilayer film is folded upon itself and heat
sealed at overlapping edges to provide a package volume bounded by
non-sealed areas of the film, the multilayer film and base
material, as well as the sealing layers being bonded, are
necessarily the same. In regions where the multilayer film is not
sealed, the sealing layer is the innermost layer, facing the
interior of the package and often contacting the package contents,
such as food, directly.
[0088] A preferred sealing layer contains (1) a polypropylene or
(ii) a blend of polypropylene and at least one other polyolefin.
Polyolefins include polyolefin plastomers, such as, for example
polyethylene that may be blended in the sealing layer. The
polyolefin may be high-density polyethylene. The sealing layer may
contain (i) a cast retortable grade polypropylene (ii) a coextruded
polypropylene polymer or copolymer, or (iii) a blend of a
coextruded polypropylene polymer or copolymer and at least one
other polyolefin. In one particular embodiment, the sealing layer
comprises 100% by weight of cast retortable grade
polypropylene.
[0089] The thickness of the sealing layer is generally from about
10 .mu.m (0.39 mils) to about 500 .mu.m (20 mils), and typically
from about 50 .mu.m (2 mils) to about 200 .mu.m (7.9 mils). In
addition to the sealing layer, the multilayer film further includes
an outer layer facing the exterior of the package and disposed
furthest from the package contents. In the case of 2-layer films,
the outer layer and sealing layer are adjacent and bonded directly
to one another. In the case of films including further layers
(i.e., 3 or more total layers), the outer and sealing layers are
not adjacent, but separated by these further layers, being disposed
therebetween. A representative outer layer includes, but is not
limited to (i) biaxially oriented nylon (ii) biaxially oriented
polypropylene or (iii) biaxially oriented polyethylene
terephthalate.
[0090] In representative films, an adhesive layer or a primer layer
may be disposed between the outer and sealant layers. In the
particular case of a 3-layer film, the adhesive or primer may be
adjacent both the outer and sealant layers (i.e., sandwiched
between these layers). Any adhesive or primer used should be
suitable to resist delamination or other failure during the retort
process.
[0091] Representative films including more than 3 layers may also
include, but are not limited to, (i) one or more further biaxially
oriented nylon or biaxially oriented polyethylene terephthalate
layers, as described in the outer layer, and/or (ii) one or more
further adhesive or primer layers, as described above. Such
multilayer films may also comprise functional layers, including
functional barrier layers such as ethylene vinyl alcohol copolymer
or an oxide coating.
[0092] The total thickness of a representative, multilayer film
used in a self-venting, retortable package, as described herein, is
generally from about 51 .mu.m (2 mils) to about 380 .mu.m (15
mils), and typically from about 74 .mu.m (2.9 mils) to about 150
.mu.m (6 mils).
[0093] A representative 5-layer film, for example, includes the
following layers, in order: an outer layer of biaxially oriented
polyethylene terephthalate, a polyurethane adhesive layer, a
biaxially oriented nylon layer, a second polyurethane adhesive
layer, and a polypropylene sealant layer. Another representative
5-layer film, for example, includes the following layers, in order:
an outer layer of biaxially oriented polyethylene terephthalate, a
polyurethane adhesive layer, an aluminum foil layer, a second
polyurethane adhesive layer, and a polypropylene sealant layer.
[0094] The following examples are set forth as representative of
the present application. These examples are not to be construed as
limiting the scope of the application as other equivalent
embodiments will be apparent in view of the present disclosure and
appended claims.
Comparative Example 1: Package with Horizontal Intermediate Seal
Forming Top and Bottom Compartments
[0095] A self-venting one-compartment pouch made on a production
Totani machine was used to create a multi-compartment retortable
package. Four ounces of pasta sauce was filled in the bottom
compartment. A horizontal intermediate seal was made, connecting
the side seals. About 0.55 ounces of pasta was filled above the
intermediate seal and a top seal was made. The seal conditions of
the horizontal intermediate seal were 385.degree. F. (196.1.degree.
C.) to 390.degree. F. (199.degree. C.) for 0.5 to 0.6 seconds at 70
pounds per square inch (psi). Both the intermediate seal and the
top seal were made without consideration of venting and the seals
were as strong as the other perimeter seals. The package was then
processed through a retort cycle. After retorting, package was
subjected to microwave heating. The packaged failed during
microwave heating, tearing through the body of the bottom
compartment and causing some of the pasta sauce to spill from the
tear. The intermediate seal did not open and the pasta and sauce
did not mix.
Example 1: Package with Horizontal Intermediate Seal Forming Top
and Bottom Compartments, Including Venting Region in Intermediate
Seal
[0096] A package was made and filled using the process described in
Comparative Example 1 above. However, the intermediate seal was
made using a shaped seal bar with a "venting" region that protruded
into the bottom compartment of the pouch and also had a narrower
width than the remainder of the intermediate seal. The package was
then processed through a retort cycle. After retorting, package was
subjected to microwave heating. The intermediate seal failed after
about 30 seconds of microwave heating, allowing the pasta to fall
into the sauce. After the food products mixed, the peripheral
self-venting region of the peripheral seal failed. The remainder of
the peripheral seal was intact.
Comparative Example 2: Package with Horizontal Intermediate Seal
Forming Top and Bottom Compartments, Pouch Vented Prior to
Microwave Heating
[0097] A package was made and filled using the process described in
Example 1 above. The package was then processed through a retort
cycle. After retorting, a small cut was placed in the top
compartment, effectively venting this compartment. The package was
subjected to microwave heating. The self-venting region of the
intermediate seal opened, but the remainder of the intermediate
seal did not open and the pasta and sauce did not completely mix.
Because the top compartment had been vented prior to the
intermediate seal venting, there was not enough pressure in the top
compartment to force a larger opening in the intermediate seal.
Example 2: Package with Vertical Intermediate Seal Forming Two
Horizontal Compartments
[0098] The vertical intermediate seal includes an intermediate
self-venting region pointing towards the compartment containing a
sauce. The other compartment contained noodles. Seal Conditions of
the vertical intermediate seal between compartments were
385.degree. F. (196.1.degree. C.) to 390.degree. F. (199.degree.
C.) for 1.5 seconds at 70 psi. A vented sealing bar was used to
make the vertical intermediate seal. During the microwave process,
the two compartments expanded and the vertical intermediate seal
opened up along its entire length. The products in the two
compartments mixed after the vertical intermediate seal opened.
[0099] The description, examples, embodiments, and drawings
disclosed are illustrative only and should not be interpreted as
limiting. The present invention includes the description, examples,
embodiments, and drawings disclosed; but it is not limited to such
description, examples, embodiments, or drawings. As briefly
described above, the reader should assume that features of one
disclosed embodiment can also be applied to all other disclosed
embodiments, unless expressly indicated to the contrary.
Modifications and other embodiments will be apparent to a person of
ordinary skill in the packaging arts, and all such modifications
and other embodiments are intended and deemed to be within the
scope of the present invention.
Embodiments
[0100] A. A retortable package comprising: a body defining a
perimeter; a peripheral seal formed along the perimeter of the
body, the peripheral seal comprising at least one peripheral
self-venting region and at least one peripheral non-venting region;
and an intermediate seal formed within the perimeter of the body
and contiguous with the peripheral seal, the intermediate seal
dividing the body into two compartments, the compartments receiving
respective products therein; wherein, upon heating of the products,
the intermediate seal ruptures before the at least one peripheral
self-venting region ruptures, wherein the at least one peripheral
self-venting region ruptures before the at least one peripheral
non-venting region ruptures. B. The retortable package of
embodiment A, the intermediate seal further comprises at least one
intermediate self-venting region and at least one intermediate
non-venting region, wherein the at least one intermediate
self-venting region ruptures before the at least one intermediate
non-venting region ruptures. C. The retortable package of
embodiment A or B, wherein the least one intermediate self-venting
region protrudes inwardly into one of the compartments relative to
the at least one intermediate non-venting region of the
intermediate seal. D. The retortable package of any one of
embodiment B or C, wherein a minimum width of the at least one
intermediate self-venting region is less than a minimum width of
the at least one intermediate non-venting region. E. The retortable
package of any one of embodiments B-D, wherein the at least one
intermediate self-venting region is V-shaped or curved. F. The
retortable package of any one of embodiments A-E, wherein the body
further comprises a top edge, a bottom edge, and a pair of side
edges connecting the top and bottom edges, wherein the body further
defines a longitudinal axis extending between the top edge and the
bottom edge. G. The retortable package of embodiment F, wherein the
intermediate seal is parallel to the longitudinal axis of the body.
H. The retortable package of embodiment F, wherein the intermediate
seal is perpendicular to the longitudinal axis of the body. I. The
retortable package of embodiment F, wherein the intermediate seal
is inclined obliquely to the longitudinal axis of the body. J. The
retortable package of any previous embodiment, wherein the
peripheral seal comprises two peripheral self-venting regions
disposed adjacent to one of the compartments. K. The retortable
package of any one of embodiments A-I, wherein each of the two
compartments is adjacent to a peripheral self-venting region. L.
The retortable package of any previous embodiment, wherein the body
further comprises a gusset fold, the gusset fold forming a first
folded region and a second folded region. M. The retortable package
of embodiment L, wherein the intermediate seal further comprises a
main portion disposed above the gusset fold, a first branch portion
disposed in the first folded region, and a second branch portion
disposed in the second folded region. N. The retortable package of
any previous embodiment, wherein a width of the intermediate seal
is from 2 mm to 8 mm. O. The retortable package of any previous
embodiment, wherein a width of the peripheral seal is greater than
6 mm. P. The retortable package of any previous embodiment, wherein
the peripheral seal has a peel strength of greater than 2500
gram-force/inch. Q. The retortable package of any previous
embodiment, wherein at least 50% of a length of the intermediate
seal ruptures upon heating of the products. R. A packaged product
comprising: [0101] a retortable package comprising: [0102] a body
defining a perimeter; [0103] a peripheral seal formed along the
perimeter of the body, the peripheral seal comprising at least one
peripheral self-venting region and at least one peripheral
non-venting region; and [0104] an intermediate seal formed within
the perimeter of the body and contiguous with the peripheral seal,
the intermediate seal dividing the body into a first compartment
and a second compartment sealed from the first compartment; [0105]
a first product received within the first compartment; and [0106] a
second product received within the second compartment; [0107]
wherein, upon heating of the first and second products, at least
50% of a length of the intermediate seal ruptures and the first and
second products mix together, wherein the intermediate seal
ruptures before the at least one peripheral self-venting region
ruptures, wherein the at least one peripheral self-venting region
ruptures before the at least one peripheral non-venting region
ruptures. S. The packaged product of embodiment R, wherein the
first product and the second product have different water contents.
T. The packaged product of embodiment R or S, wherein the first
compartment and the second compartment have different volumes. U. A
retortable package comprising: [0108] a body defining a perimeter,
the body comprising a gusset fold forming a first folded region and
a second folded region; [0109] a peripheral seal formed along the
perimeter of the body, the peripheral seal comprising at least one
peripheral self-venting region and at least one peripheral
non-venting region, wherein the peripheral seal is at least
partially peelable; and [0110] an intermediate seal formed within
the perimeter of the body and contiguous with the peripheral seal,
the intermediate seal dividing the body into two compartments, the
compartments receiving respective products therein, wherein the
intermediate seal further comprises a main portion disposed above
the gusset fold, a first branch portion disposed in the first
folded region, and a second branch portion disposed in the second
folded region; [0111] wherein, upon heating of the products, the
intermediate seal ruptures before the at least one peripheral
self-venting region ruptures, wherein the at least one peripheral
self-venting region ruptures before the at least one peripheral
non-venting region ruptures.
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