U.S. patent application number 12/259590 was filed with the patent office on 2009-02-19 for multi-compartment package.
Invention is credited to Edward Anthony Bezek, Anthony Robert Knoerzer, Garrett William Kohl, Brad Dewayne Rodgers, Steven Kenneth Tucker.
Application Number | 20090047395 12/259590 |
Document ID | / |
Family ID | 39638840 |
Filed Date | 2009-02-19 |
United States Patent
Application |
20090047395 |
Kind Code |
A1 |
Bezek; Edward Anthony ; et
al. |
February 19, 2009 |
Multi-Compartment Package
Abstract
A method for making a multi-compartment microwavable package
having one or more open or closed compartments within the package,
and method and apparatus for manufacturing the same, constructed by
modification to existing vertical form, fill and seal packaging
machines. The invention involves producing a multi-compartment bag
having an internal permeable wall between compartments from a
single sheet of flexible packaging film. A food product can be
placed into the first compartment and steam pack can be placed into
the second compartment.
Inventors: |
Bezek; Edward Anthony;
(Frisco, TX) ; Rodgers; Brad Dewayne; (Frisco,
TX) ; Kohl; Garrett William; (Barrington Hills,
IL) ; Tucker; Steven Kenneth; (Hurst, TX) ;
Knoerzer; Anthony Robert; (Parker, TX) |
Correspondence
Address: |
CARSTENS & CAHOON, LLP
P O BOX 802334
DALLAS
TX
75380
US
|
Family ID: |
39638840 |
Appl. No.: |
12/259590 |
Filed: |
October 28, 2008 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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11622121 |
Jan 11, 2007 |
7458195 |
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12259590 |
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11036802 |
Jan 14, 2005 |
7178313 |
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11622121 |
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Current U.S.
Class: |
426/113 ;
206/219; 383/120; 383/38; 426/120; 426/122 |
Current CPC
Class: |
B65B 2220/10 20130101;
B65B 9/2056 20130101; B65D 75/54 20130101; B65B 29/10 20130101;
B65B 9/20 20130101; B65D 81/3261 20130101; B65B 2230/02 20130101;
B65B 29/08 20130101; B65B 2220/14 20130101 |
Class at
Publication: |
426/113 ;
206/219; 383/38; 383/120; 426/120; 426/122 |
International
Class: |
B65D 30/22 20060101
B65D030/22; B65D 81/34 20060101 B65D081/34 |
Claims
1-17. (canceled)
18. A multi-compartment package, comprising: a first compartment
(1018); a second compartment (1020) wherein said first compartment
(1018) and said second compartment (1020) are separated by an inner
permeable wall (1040) having a compartment terminal end (926),
wherein said second compartment (1020) further comprises: an
overlap segment (1030) having an overlap end (922), wherein said
overlap end (922) is sealed to said inner permeable wall (1040) by
a first longitudinal seal (1022) and wherein said compartment
terminal end (926) is sealed to said overlapped segment (1030) by a
second longitudinal seal (1026); wherein said first compartment
(1018) and said second compartment (1020) have a first transverse
seal, a second transverse seal, said first and said second
transverse seals each extending across opposite edges of said first
compartment (1018) and said second compartment (1020) and sealing
all layers of said first compartment (1018) and said second
compartment (1020) together; and wherein said longitudinal seals
(1022 1026) extend from said first transverse seal to said second
transverse seal.
19. The multi-compartment package of claim 18 wherein said package
is made from a single sheet of film.
20. The multi-compartment package of claim 18 wherein said first or
said second longitudinal seals further comprise cold seals.
21. The multi-compartment package of claim 18 wherein said first or
said second compartments contain a food product.
22. The multi-compartment package of claim 21 wherein said food
product comprises an expandable food product.
23. The multi-compartment package of claim 18 wherein either of
said first or said second compartments contain a steam pack.
24. The multi-compartment package of claim 18 wherein said first
compartment comprises at least one gusset.
25. The method of claim 18 wherein said inner permeable compartment
wall (1040) comprises a plurality of perforations (912).
26. The method of claim 18 wherein said inner permeable compartment
wall (1040) fractures open upon application of heat or physical
stress.
Description
CROSS REFERENCE TO RELATED APPLICATION
[0001] This application is a continuation-in-part of U.S.
application Ser. No. 11/036,802 entitled "Method for Making a
Package Having at Least Two Items" and filed on Jan. 14, 2005.
BACKGROUND OF THE INVENTION
[0002] 1. Technical Field
[0003] The present invention relates to a method for making a
microwavable package having a permeable compartment constructed
using a modified vertical form, fill, and seal packaging machine,
and the apparatus and method for making same, that provides for a
single piece construction of the package. The invention allows for
use of existing converter and packaging technology to produce a
microwavable package having one or more permeable compartments with
minimal increased cost and minimal modification.
[0004] 2. Description of Related Art
[0005] Vertical form, fill, and seal packaging machines are
commonly used in the snack food industry for forming, filling, and
sealing bags of chips and other like products. One such packaging
machine is seen diagrammatically in FIG. 1. This drawing is
simplified and does not show the cabinet and support structures
that typically surround a machine, but it demonstrates the working
of the machine well. Packaging film 110 is taken from a roll 112 of
film and passed through tensioners 114 that keep it taut. The film
then passes over a former 116, which directs the film into a
vertical tube around a product delivery cylinder 118. As the tube
is pulled downward by drive belts 120 the vertical tube of film is
sealed along its length by a vertical sealer 122, forming a back
seal 124. The machine then applies a pair of heat sealing jaws 126
against the tube to form a transverse seal 128. This transverse
seal 128 acts as the top seal on the bag 130 below the sealing jaws
126 and the bottom end seal on the bag 132 being filled and formed
above the jaws 126. After the transverse seal has been formed, a
cut is made across the sealed area to separate the finished bag 130
below the seal 128 from the partially completed bag 132 above the
seal. The tube is then pushed downward to draw out another package
length. Before the sealing jaws form each transverse seal, the
product to be packaged is sent through the product delivery
cylinder 118 and is held within the tube above the transverse seal
128. The material that is fed into the form, fill and seal machine
is typically a packaging film such as polypropylene, polyester,
paper, polyolefin extrusions, adhesive laminates, and other such
materials, or from layered combinations of the above. For many food
products, where flavor retention is important, a metalized layer
will form the inner most layer.
[0006] One modification to a vertical form, fill, and seal
packaging machine is disclosed in U.S. Pat. No. 6,722,106 ("the
'106 patent"), which is assigned to the same assignee as the
present invention. The '106 patent discloses a method for making a
free standing package called a vertical stand up pouch. The
modification uses two forming plates 104 and a tension bar 102 to
hold the packaging film tube in tension from inside the tube.
Tension is applied on the outside of the film and in the opposite
direction of the tension provided by the forming plates 104 by a
fixed or stationary tucker mechanism 106 positioned between the
forming plates 104. When the tucker bar 106 is properly positioned,
it provides a crease or fold in the tube of the packaging film
between the two forming plates 104. This creates a gusset 135 that
permits the package to stand upright on the gusset 135. The crease
is formed prior to formation of the transverse seal by the seal
jaws 126. Consequently, once the transverse seal is formed, the
crease becomes an integral feature of one side of the package.
[0007] The vertical form and fill machine thereafter operates
basically as previously described in the prior art, with the
sealing jaws 126 forming a lower transverse seal (and upper
transverse seal for the bag below), and product being introduced
through the forming tube 101 into the sealed tube of packaging film
which now has a crease on one side. The film is then pulled
downward by moving belts 120 and the upper transverse seal is
formed, thereby completing the package. An example of the vertical
stand up package formed is shown in FIGS. 2a and 2b. The outside
layer of packaging film show the graphics 179 oriented 90 degrees
clockwise from graphics orientation normally present on a pillow
pouch formed by a standard prior art vertical form, fill and seal
machine. As shown in FIG. 2b the transverse seals 128 of the
vertical stand up package are oriented vertically once the bag
stands up on one end as shown in FIG. 2b. FIG. 2a shows the crease
176 that was formed by the tucker bar 106 and forming plates 104
shown in FIG. 1 to create a gusset 135 that permits the package to
stand upright. Various modifications of the vertical stand up
pouch, methods for making the pouch, and apparatuses for making the
pouch are disclosed in U.S. Pat. Nos. 6,729,109 and 6,679,034.
[0008] Another self standing flexible pouch is disclosed in U.S.
Pat. No. 6,679,630 also assigned to the same assignee as the
present invention. FIG. 3a is cross-sectional view of the self
standing flexible package disclosed in the '630 patent. Referring
to FIG. 3a, the '630 patent teaches a package 70 having a flap 78
formed by creating a bend 84 in the film to form an inner portion
of flap 78. An opening 90 is formed between the inner and outer
portions of the flap 78. FIG. 3b shows a completed package 70 in a
standing or display position. Referring to FIGS. 3a and 3b, as
package 70 is shown standing, flap 78 extends outward and away from
back forming pocket 80. To enclose and retain any product within
the package a back seal 124 seals the film tube and transverse end
seals 128 seal the terminal ends of package 70. The transverse
seals 128 also serve to retain the flap 78 to the terminal ends of
package 70. Unfortunately, the '630 patent requires the flap 78 to
be manually drawn away from the back for the package 70 to stand
erect with the use of a flap 78. Thus, the package requires manual
manipulation to stand up. In addition, because packages are
typically opened at the transverse seals, product can spill out of
the package after the package is opened, when the package is in the
stand up position. Thus, there is a need to provide a package
having a compartment or pocket that permits the compartment to hold
different contents than are held in the main portion of a package
when the package stands erect. Consequently, a need exists for a
vertical stand-up package having one or more open compartments that
are accessible while the package is standing erect that minimizes
the use of film. The prior art discloses other containers often
associated with TV dinners having multi-compartment food containers
where the compartments are adjacent and integrated into the
container. Unfortunately, many of these food containers are made
from more expensive thermoforming techniques. Consequently, a need
exists for a multi-compartment food container that can be made from
an economical modification of a vertical form, fill, and seal
machine.
[0009] Further, a need also exists for an economical method for
making a multi-compartment container having a porous wall between
the compartments. Such container can be useful for microwave oven
applications.
SUMMARY OF THE INVENTION
[0010] The proposed invention involves producing a microwavable
package having one or more permeable compartments constructed from
a single sheet of material using a vertical form, fill, and seal
machine modified with a spiral former, a first and second filling
structure, and an optional gusseting mechanism. The former receives
flexible packaging film and forms a tube having an overlap end and
an inner end comprising a permeable portion. The overlap is sealed
to the tube thereby causing the inner end to form an internal
permeable compartment wall. The optional gusseting mechanism
creates a vertical tuck along the length of the bag while it is
being formed permitting the package to stand up once the transverse
end seals are made. In one embodiment, two gussets are made to
permit the package to expand upon microwave heating.
[0011] The method disclosed and the package formed as a consequence
is a substantial improvement over prior art packages having a
compartment. The method works on existing vertical form, fill, and
seal machines requiring little modification. There are no jaw
carriage modifications involved. The bag makers can be easily
converted back to a pillow pouch configuration with a relatively
few simple changes. A microwave safe film sheet having a permeable
portion can easily be used in place of a traditional film sheet.
The above as well as additional features and advantages of the
present invention will become apparent in the following written
detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The novel features believed characteristic of the invention
are set forth in the appended claims. The invention itself,
however, as well as a preferred mode of use, further objectives and
advantages thereof, will be best understood by reference to the
following detailed description of illustrative embodiments when
read in conjunction with the accompanying drawings, wherein:
[0013] FIG. 1 is a perspective view of a prior art form, fill, and
seal machine.
[0014] FIGS. 2a and 2b are perspective views of prior art vertical
stand-up packages.
[0015] FIG. 3a is a cross-sectional view of a prior art package
capable of self support having a pouch.
[0016] FIG. 3b is a perspective view of a prior art package.
[0017] FIG. 4 is a perspective view of one embodiment of the
present invention depicting a modified form, fill, and seal
machine.
[0018] FIG. 5a is a simplified top view of the dual delivery tube
assembly of one embodiment of the present invention.
[0019] FIG. 5b is a cut away perspective view of the package in
accordance with one embodiment of the present invention.
[0020] FIG. 5c is a cut-away side view of the package in accordance
with one embodiment of the present invention.
[0021] FIG. 5d depicts a cut away top view of one embodiment of the
present invention having salsa poured into the compartment.
[0022] FIG. 6a is a front view of one embodiment of the vertical
stand-up package having a compartment.
[0023] FIG. 6b is a perspective bottom view of the package depicted
in FIG. 6a.
[0024] FIG. 7a is a perspective view of a folding device adjacent
the vertical form fill and seal machine along line 7A-7A of FIG. 4
in accordance with one embodiment of the present invention.
[0025] FIG. 7b is a perspective view of the folding device depicted
in FIG. 7a along line 7B-7B of FIG. 4
[0026] FIG. 7c is a perspective view of a folding device depicted
in FIG. 7a along line 7C-7C of FIG. 4.
[0027] FIG. 8a is a simplified top view of the multi-delivery tube
assembly in accordance with one embodiment of the present
invention.
[0028] FIG. 8b is a cut-away perspective view of the package made
from the assembly depicted in FIG. 8a.
[0029] FIG. 9 is a perspective view of one embodiment of the
present invention depicting a modified form, fill, and seal machine
utilizing a permeable packaging film having a plurality of
perforations disposed about a portion of the width and along the
longitudinal axis of the film sheet.
[0030] FIG. 10a is a cut-away perspective view of the package made
from the assembly depicted in FIG. 9.
[0031] FIG. 10b depicts a cut away elevational view of a package
made in accordance with one embodiment of the present
invention.
DETAILED DESCRIPTION
[0032] FIG. 4 is a perspective view of one embodiment of the
present invention depicting a modified form, fill, and seal
machine. A spiral former 426 receives the packaging film 110 and
directs the compartment terminal end 410 around a fill tube or
first filling structure 418 to receive a first item 718. The former
426 simultaneously directs the tube terminal end 622 (film overlap
end) to overlap the compartment terminal end 410 (film inner end).
Thus, in the embodiment shown, the spiral former 426 creates a tube
having an enclosed channel in communication with a first filling
structure 418 and an open channel in communication with a second
filling structure 420. The second filling structure 420 is adjacent
the first filling structure 418 and situated so as to permit a
second item 720 to be placed in the open channel. The open channel
becomes the compartment when the package is sealed.
[0033] FIG. 5a is a simplified top view depicting the former and
dual delivery tube assembly of one embodiment of the present
invention. In the embodiment shown, an indention in the first
filling structure 418 creates a channel for placement of the second
filling structure 420. This indention, however, is not required and
is shown to be illustrative of one embodiment. The film tube
comprises an inner compartment wall 640 bounded by a compartment
terminal end 410 and a compartment seal end 422.
[0034] Referring to FIGS. 4 and 5a, as the film tube is pulled
downward by drive belts 120, the vertical tube terminal end 622 of
film is sealed to the compartment seal end 422 by a vertical sealer
122. The vertical sealer 122 can use heat seal or cold seal
technology. The tube then passes over two forming plates 104 and a
tension bar 102. A tucker bar 106, positioned between the forming
plates 104, provides a crease or fold in the tube of packaging film
between the two forming plates 104. The sealing jaws 126 then form
a first end seal.
[0035] FIG. 5b is a cut away perspective view of the package in
accordance with one embodiment of the present invention. Referring
to FIGS. 5a and 5b, the lap seal 522, created by the vertical
sealer 122, has sealed the seal end 422 of the compartment wall 640
and the tube terminal end 622. The compartment terminal end 410 of
the compartment wall 640 is secured within the package by the first
end seal 631 at the location generally depicted by numeral 412. A
compartment 620 is thereby formed that is bounded by an overlapped
segment of film 520, or overlap wall 520 of the tube, the lap seal
522 and the compartment wall 640. The main portion 618 is bounded
by the compartment wall 640 and the gusset 680.
[0036] FIG. 5c is a cut-away side view of the package in accordance
with one embodiment of the present invention. In the embodiment
shown, the package 600 comprises two compartments 618 620 open to
one another. A first item 718 rests in the main portion 618 of the
package 600 while a second item 720 is disposed within the
compartment portion 620 of the package 600. The first and second
items are separated by a compartment wall 640. As shown by FIG. 5c,
the package is formed by a single sheet of film formed into a tube
having an overlap wall 520. The terminal end 622 of the overlap
wall 520 is sealed with a lap seal 522 to the compartment seal end
422 of the compartment wall 640. It should be noted that the height
of the compartment wall 640 can be adjusted as desired.
Additionally, as will be discussed in greater detail below, the top
of the compartment wall 640 can be sealed to the overlap wall 520
to form a closed compartment. Such embodiment could prove
advantageous, for example, to permit placement of a liquid in
either compartment or to prevent the compartments from sharing
headspace.
[0037] Referring to FIGS. 4, 5a, and 5b, upon completion of the
first end seal 631, a first item 718 can be dropped through a first
filling structure 418 in communication with the main portion 618 of
the tube. Similarly, a second item 720 can be dropped through a
second filling structure 420 in communication with the compartment
portion 620 of the tube. The items can be dropped simultaneously.
Once the first item 718 and second item 720 have been placed in the
package, a second end seal can be provided by the sealing jaws
126.
[0038] FIG. 6a is a front view of one embodiment of the vertical
stand up package having a compartment. FIG. 6b is a bottom
perspective view of the package depicted in FIG. 6a. The flexible
vertical stand up package 600 rests on the gusset 680 having a
crease 676 and, unlike a standard pillow pouch package, the end
seals 631 are oriented in a vertical direction. A score line 615
can facilitate opening the package by removing the top. In a
preferred embodiment, the lap seal 522 is located adjacent the
gusset 680 to provide additional stability for the stand up package
600.
[0039] One advantage of the package formed by the present invention
is that complementary items can be stored in the package. For
example, in one embodiment the first item can comprise tortilla
chips and the second item can comprise pre-packaged salsa. The
salsa can be pre-packaged in a traditional pillow package by a
prior art vertical form, fill, and seal machine similar to that
depicted in FIG. 1. The vertical stand up package can then be
opened, the pre-packaged salsa can be retrieved from the open
compartment, opened, and poured into the pouch from which it was
retrieved. In an alternative embodiment, salsa or other liquid can
be directly placed into a closed compartment.
[0040] FIG. 5d depicts a cut away top view of one embodiment of the
present invention having salsa poured into the compartment 620.
Salsa, when poured into the compartment 620, applies pressure at
the compartment wall 640 and can press the compartment wall 640 in
the direction of the arrows 623 shown in FIG. 5c and FIG. 5d to
form a dipping well. Surprisingly, when the compartment terminal
end 410 is folded over a portion of the compartment wall 640, the
integrity of the compartment 620 is enhanced and salsa, or other
product, is less likely to spill from the compartment 620 over the
compartment wall 640 into the main portion 618 of the package.
Thus, the present invention permits a consumer to purchase a
package having chips and salsa, and to then use the package to
consume the chips and salsa directly from the stand up package
without the chips spilling out of the package or using (and
potentially dirtying) a salsa dish. Such package can be ideal for
picnics or anytime a ready-to-eat product is desired.
[0041] FIG. 7a is a perspective view of a folding device adjacent
the vertical form fill and seal machine along line 7A-7A of FIG. 4
in accordance with one embodiment of the present invention. FIG. 7b
is a perspective view of the folding device depicted in FIG. 7a
along line 7B-7B of FIG. 4. FIG. 7c is a perspective view of a
folding device depicted in FIG. 7a along line 7C-7C of FIG. 4.
Referring to FIGS. 4, 5c, 7a-7c, the rolled edge can be formed with
a folding device 700 near the former 426 to permit a portion of the
film which eventually becomes the compartment wall 640 terminal end
410 to fold over a portion of itself so as to provide a j-shaped
rolled edge or fold having a trough 411 and a terminal end 410. In
the embodiment shown, the folding device 700 comprises a tucker bar
702 and a pair of rollers 704 705. The angle that the tucker bar
702 engages the film 110 can be adjusted to obtain the desired
fold. In the embodiment shown, the v-shaped bottom roller 704
comprises a channel 706. The top disc-shaped roller 705 is disposed
within the channel 706. The tucker bar 702, positioned between the
tensioner 114 and the pair of rollers 704 705 provides a j-shaped
fold having a terminal end 410 and a trough end 411.
[0042] While the folding device 700 as shown comprises a tucker bar
702 and a pair of rollers 704 705, in one embodiment, the folding
device 700 comprises the tucker bar 702. In one embodiment, the
trough end 411 of the fold passes through the channel 706 of the
bottom v-shaped roller 704. The outer edge of the disc-shaped top
roller 705 is bounded on two sides by the packaging film 110 as the
packaging film 110 passes through the channel 706 of the bottom
v-shaped roller 704. In one embodiment, the former 426 comprises a
gutter 710 mounted adjacent the edge of the former. The gutter 710
can be substantially perpendicular to the former edge.
[0043] FIG. 8a is a simplified top view of the multi-delivery tube
assembly in accordance with one embodiment of the present
invention. In the embodiment shown, extensions 160 are attached to
the first filling structure 418. As shown in FIG. 8a, the
multi-delivery tube assembly comprises a first filling structure
418, a second filling structure 420 and a third filling structure
421. In addition, the multi-delivery tube assembly depicted in FIG.
8a comprises a first vertical sealer 122, a second vertical sealer
124 and a third vertical sealer 126 for sealing portions of the
overlap segment 520 of film to a portion of the inner compartment
wall 640.
[0044] FIG. 8b is a cut-away perspective view of the package made
from the assembly depicted in FIG. 8a. As shown in the Figure, the
overlap segment 520 comprises a first longitudinal seal 522, a
second longitudinal seal 524, and a third longitudinal seal 526. In
the embodiment shown, the package comprises three compartments 618
620 621 closed from one another. In one embodiment, one or more of
the longitudinal seals 522 524 526 comprises a cold seal. Cold seal
technology is well known in the art and is widely used to close
food packages having heat-sensitive foods such as chocolate bars
where heat sealing of the package is not desirable. Cold seal
adhesives are typically coated or printed onto a flexible packaging
film to permit sealing of the package with pressure.
[0045] It should be noted that there are several potential
embodiments of the present invention. For example, referring to
FIG. 8b, in one embodiment if the third longitudinal seal 526 is
omitted, the package can have a first compartment 618, a sealed
second compartment 620 and a third open compartment 621. Thus, a
package having two compartments 618 621 open to one another and a
closed compartment 620 can be produced.
[0046] Examples of package applications, such as complementary
products that can be packaged together in the main portion and
compartment include crackers and cheese, cake mix and pre-packaged
icing, or ready to eat cereal, milk, and/or a utensil such as a
spoon. A pre-packaged seasoning can be placed in the compartment
portion and a dehydrated food, such as noodles, can be placed in
the main portion. The seasoning can be removed, water added to the
main portion 618, the entire package can then be heated in a
microwave, the seasoning can be added, and the consumer can consume
the food product directly from the main portion 618 of the
package.
[0047] Promotional items can be also placed in the compartment with
product placed in the main portion of the package. Thus, a consumer
desiring to immediately access the promotional item can easily do
so without immersing one's hand and fingers in product. For
example, a promotional coupon can be placed into compartment
portion of the package while potato chips are placed into the main
portion. A consumer may only want a portion of potato chips, but
may want to also access the promotional coupon. The promotional
coupon, in prior art packages having no compartment often falls to
the bottom of the package. Thus, a consumer may be forced, in a
prior art package, to dig with his or her hand through the potato
chips in order to access the promotional coupon. The present
invention, on the other hand, permits a consumer to simply reach
directly into the compartment to retrieve the promotional coupon
without contacting product. The food package need not be limited to
shelf-stable food products. For example, the package of the present
invention can be used to store cereal and pre-packaged milk in the
refrigerated section of a grocery store.
[0048] FIG. 9 is a perspective view of one embodiment of the
present invention depicting a modified form, fill, and seal machine
utilizing a packaging film 910 having a permeable portion. In the
embodiment shown, the permeable portion comprises a plurality of
perforations 912, wherein the perforations 912 are disposed about a
portion of the width and along the longitudinal axis of the film
sheet 910. Of course, such embodiment is provided for purposes of
illustration and not limitation. In one embodiment, the permeable
portion can fracture open upon application of heat or physical
stress. In one embodiment, the permeable portion is permeable to
steam. A spiral former 426 receives the permeable packaging film
910 and directs the compartment terminal end (film inner end) 926
around a fill tube or first filling structure 418 to receive a
first item 918. In one embodiment, the first item 918 comprises a
microwavable food product. In one embodiment, the microwavable food
product comprises half-product pellets. Half product pellets are
known in the art and gradually expand upon microwave heating to
form puffed pieces. Examples of such half-products are disclosed in
U.S. Pat. Nos. 4,251,551 and 4,409,250.
[0049] The former 426 simultaneously directs the overlap end 922 to
overlap the compartment terminal end 926. FIG. 10a is a cut-away
perspective view of the package made from the assembly depicted in
FIG. 9. Referring to FIG. 9 and FIG. 10a, the spiral former 426
creates a first tube (that eventually results in a first
compartment 1018 as shown in FIG. 10a) in communication with a
first filling structure 418 and a second tube (that eventually
results in a second compartment 1020 as shown in FIG. 10b) in
communication with a second filling structure 420. The first and
second tubes are separated by an inner permeable wall 1040, wherein
the inner permeable wall 1040 has a compartment terminal end 926
that terminates inside the first tube. The second tube is defined
by an overlapped segment of film 1030 and the inner permeable
compartment wall 1040. The second filling structure 420 is adjacent
the first filling structure 418 and situated so as to permit a
second item 920 to be placed in the second compartment 1020. In one
embodiment, the second item 920 comprises a steam pack assembly as
disclosed in U.S. patent application Ser. No. 11/185,402 filed on
Jul. 20, 2005, and assigned to the same assignee as the present
invention.
[0050] As the film sheet 910 comprising two tubes is pulled
downward by drive belts 120, the compartment terminal end 922 and
overlap end 926 are sealed with vertical sealers 122 126 to seal
the overlapped segment 1030 to the permeable compartment wall 1040.
In one embodiment, the tubes then pass over oppositely positioned
forming plates 104 and tucker bars 106 to provide gussets 1080 in
the package. Although the embodiment depicted in FIG. 9 shows
equipment for a double gusseted package, such example is shown for
purposes of illustration and not limitation. The package in
accordance with various embodiments of the present invention can
have no gussets, or can have one or more gussets. Referring back to
FIG. 9, upon completion of the longitudinal seals 1022 1026, the
sealing jaws 126 can be used to make a first end seal. A first item
918 can then be placed into the first filling structure 418 in
communication with the first tube and a second item 920 can be
simultaneously placed through the second filling structure 420 in
communication with the second tube. The film can be drawn downward
by the drive belts 120 and a second transverse end seal can be used
to make the first compartment 1018 and second compartment 1020. As
shown in FIG. 10a, each compartment comprises an inner permeable
compartment wall 1040 bounded by a first longitudinal seal 1022 and
a second longitudinal seal 1026. In the embodiment shown, the
package comprises two compartments 1018 1020 closed from one
another.
[0051] In one embodiment, one or more of the longitudinal seals
1022 1026 comprises a cold seal. Cold seal technology is well known
in the art and is widely used to close food packages having
heat-sensitive foods such as chocolate bars where heat sealing of
the package is not desirable. Cold seal adhesives are typically
coated or printed onto a flexible packaging film to permit sealing
of the package with pressure.
[0052] FIG. 10b depicts a cut away elevational view of a package
made in accordance with one embodiment of the present invention. As
shown in FIG. 10b, the first item 918 comprises an expandable food
pellet in the first compartment 1018 and the second item 920
comprises a steam pack in the second compartment 1020. As shown two
gussets 1080 can be provided to permit the first compartment 1018
to expand as the food product expands upon heating in a microwave.
Even in the absence of food product expansion, the gussets 1080 can
beneficially permit the first compartment 1018 to expand as steam
generated by a steam pack in the second compartment 1020 through
the perforations 912 in the inner permeable compartment wall 1040
and into the first compartment 1018.
[0053] The are several advantages provided by the present
invention. First, the present invention provides a way to keep a
food product separate from a steam or flavor emitting source.
Direct contact with the steam or flavor emitting source and the
food product is undesirable because moisture (liquid) rather than
steam (gas) can contact the food product. Similarly, any
condensation that contacts the food product is also undesirable.
Moisture or condensation in contact with some food products can
make certain food products soggy. Similarly, in some food products
including half-products, condensation can lead to hard areas within
the cooked product and facilitate pieces of food "welding"
undesirably together into larger, congealed pieces. Further,
condensation can prevent optimal expansion of a half-product.
Advantageously, the present invention provides a package having a
porous barrier between steam source and the food product such that
the source itself does not contact the food product, yet the
volatilized components from the source are in communication with
the food product. The present invention can be achieved with
relatively inexpensive modification of existing form, fill, and
seal machinery to produce a package having an internal permeable
wall between compartments. While the invention has been
particularly shown and described with reference to a preferred
embodiment, it will be understood by those skilled in the art that
various changes in form and detail may be made therein without
departing from the spirit and scope of the invention.
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