U.S. patent application number 16/959502 was filed with the patent office on 2021-02-25 for self-standing packing bag with spout.
The applicant listed for this patent is HOSOKAWA YOKO CO., LTD.. Invention is credited to Raizo KUGE, Tomonari SHINOHARA.
Application Number | 20210053737 16/959502 |
Document ID | / |
Family ID | 1000005209187 |
Filed Date | 2021-02-25 |
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United States Patent
Application |
20210053737 |
Kind Code |
A1 |
KUGE; Raizo ; et
al. |
February 25, 2021 |
SELF-STANDING PACKING BAG WITH SPOUT
Abstract
In a self-standing packing bag with a spout of the present
invention, a bottom section is formed by a bottom member that is
half folded at a fold line and is attached to an inside of a lower
portion of the trunk section such that the fold line faces upward,
an extending direction of the fold line of the bottom section and a
closing direction of an upper end of the trunk section intersect
each other on a horizontal projection plane, and side end portions
of two regions of the bottom member divided by the fold line are
planarly bonded to an inside of the trunk section in an overlapping
state.
Inventors: |
KUGE; Raizo; (Hanno-shi,
JP) ; SHINOHARA; Tomonari; (Iruma-gun, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
HOSOKAWA YOKO CO., LTD. |
Chiyoda-ku, Tokyo |
|
JP |
|
|
Family ID: |
1000005209187 |
Appl. No.: |
16/959502 |
Filed: |
January 25, 2019 |
PCT Filed: |
January 25, 2019 |
PCT NO: |
PCT/JP2019/002500 |
371 Date: |
July 1, 2020 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B65D 75/5883 20130101;
B65D 75/008 20130101; B65D 2231/001 20130101 |
International
Class: |
B65D 75/58 20060101
B65D075/58; B65D 75/00 20060101 B65D075/00 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 2, 2018 |
JP |
2018-017413 |
Claims
1. A self-standing packing bag with a spout comprising: a trunk
section which is formed in a cylindrical shape and of which an
upper end is closed; a bottom section which is attached to a lower
portion of the trunk section; and a spout which is attached to an
upper end of the trunk section, wherein the bottom section is
formed by a bottom member that is half folded at a fold line and is
attached to an inside of the lower portion of the trunk section
such that the fold line faces upward, wherein an extending
direction of the fold line of the bottom section and a closing
direction of the upper end of the trunk section intersect each
other on a horizontal projection plane, and wherein side end
portions of two regions of the bottom member divided by the fold
line are planarly bonded to an inside of the trunk section in an
overlapping state.
2. The self-standing packing bag with the spout according to claim
1, wherein the spout has a check valve function.
Description
TECHNICAL FIELD
[0001] The present invention relates to a self-standing packing bag
with a spout.
[0002] Priority is claimed on Japanese Patent Application No.
2018-017413 filed on Feb. 2, 2018, the content of which is
incorporated herein by reference.
BACKGROUND ART
[0003] As a bag formed of a soft packing material such as a plastic
film, a self-standing bag, that is, a self-standing packaging bag
(standing pouch) is known. As the self-standing packing bag, there
is known a packing bag which is formed such that side end portions
of a bottom member are sandwiched by side end portions of a trunk
member while the half folded bottom member forming a bottom section
is inserted into a lower portion of a cylindrical trunk section so
that its fold line faces upward, the side end portions are
heat-sealed, and their lower ends are heat-sealed over the entire
circumference. In such a conventional self-standing packing bag, a
closing direction of the upper end of the trunk section is
generally parallel to the fold line of the bottom section. In such
a self-standing packing bag, when the amount of the contents
decreases, the distance between the horizontal facing surfaces of
the film forming the trunk section gradually decreases to be in
contact with each other and the horizontal thickness of the
container is thinned so as to be flat. As a result, it is difficult
to sufficiently secure self-standing ability. Here, various
measures for improving self-standing ability of such a
self-standing packing bag have been proposed from the past and as
one of the measures, a packing bag shown in Patent Document 1 is
known.
[0004] The standing pouch (the self-standing packing bag) of Patent
Document 1 has a shape in which an extending direction of the fold
line of the bottom section and an extending direction of a sealed
spout of the upper end of the trunk section intersect each other on
a horizontal projection plane. In the packing bag of Patent
Document 1, since the directions of the spout of the trunk section
and the bottom section are set as described above, the fold line of
the bottom section extends in a direction different from the flat
surface of the upper portion of the trunk section and the
self-standing packing bag spreads three-dimensionally even when the
distance between the facing surfaces of the facing films forming
the trunk section in the upper portion of the trunk section
decreases to be flat with a decrease in the amount of the contents.
Accordingly, self-standing ability can be secured. Additionally, in
the self-standing packing bag of Patent Document 1, when bonding
the bottom section to the trunk section, the side end portion of
the bottom section is sandwiched by the trunk member and is bonded
from the outer surface side of the trunk section by heat-sealing or
the like.
[0005] On the other hand, among the packaging bags, a soy sauce
container formed of a soft packing material may have a check valve
function at a spout to prevent external air from entering the
container for the purpose of preventing oxidation and the like. In
such a packing bag having the check valve function, when the amount
of the contents decreases, external air does not enter.
Accordingly, the internal volume decreases and hence a distance
between the horizontal facing surfaces of the films forming the
trunk section is narrowed to be in a close contact state. As a
result, it is more difficult to maintain self-standing ability
compared to the packing bag without the check valve function. Here,
Patent Document 2 discloses a self-standing pouch having a check
valve function, which is a self-standing pouch having a double
structure of an inner bag formed of a synthetic resin film and
filled with contents and an outer bag having a side seal portion,
capable of standing on its bottom, formed of a synthetic resin
film, and containing the inner bag. Further, Patent Document 3
discloses a liquid-filled packaging structure having a double
structure of a non-self-standing liquid-filled packaging body and a
self-standing packaging bag formed of a laminated film.
CITATION LIST
Patent Literature
[0006] [Patent Document 1]
[0007] Japanese Unexamined Patent Application, First Publication
No. 2001-247135 [0008] [Patent Document 2]
[0009] Japanese Unexamined Patent Application, First Publication
No. 2015-006891 [0010] [Patent Document 3]
[0011] Japanese Unexamined Patent Application, First Publication
No. 2010-018323
SUMMARY OF INVENTION
Technical Problem
[0012] In the self-standing packing bag disclosed in Patent
Document 1, when bonding the bottom section to the trunk section,
the side end portion of the bottom section is sandwiched by the
trunk section and is bonded from the outer surface side of the
trunk section by heat-sealing or the like to form the bonded
portion. Then, there is a change in the width of the content
container from the upper end of the joint. That is, the trunk
section above the upper end of the bonded portion spreads over its
full width with the contents contained therein, but in a portion
provided with the bonded portion, that is, the lower portion of the
trunk section provided with the bottom member, the bonded portion
prevents the trunk section from spreading by the width of the
bonded portion. As a result, when the internal pressure of the bag
increases such as when the bag is dropped, the load of the contents
is locally and largely applied to the upper end of the bonded
portion. Accordingly, there is a problem that the bonded portion is
broken and the bag is easily broken. Further, in a state in which
the remaining amount of the contents is small, the contents are
accumulated on the upper end of the bonded portion as described
above and hence the contents cannot be discharged completely.
[0013] Further, in the self-standing pouch of Patent Document 2 and
the liquid-filled packaging structure of Patent Document 3, since
the inner bag filled with the contents does not have self-standing
ability in the structure having the check valve function, the outer
bag is allowed to secure self-standing ability by a double bag
structure. However, due to the double structure, it is difficult to
visually check a decrease in the amount of the contents from the
outside. Further, there is a problem that the manufacture is
difficult and the cost is high.
[0014] The present invention has been made in view of the
above-described circumstances and an object of the present
invention is to provide a self-standing packing bag with a spout
which is formed of a soft and thin material such as a
single-structure laminated film, can reliably and sufficiently
secure self-standing ability, and prevents an easy breakage of an
upper end in a bonded portion between a trunk section and a bottom
section side end portion.
Solution to Problem
[0015] A self-standing packing bag with a spout of the present
invention includes: a trunk section which is formed in a
cylindrical shape and of which an upper end is closed; a bottom
section which is attached to a lower portion of the trunk section;
and a spout which is attached to an upper end of the trunk section,
wherein the bottom section is formed by a bottom member that is
half folded at a fold line and is attached to an inside of the
lower portion of the trunk section such that the fold line faces
upward, wherein an extending direction of the fold line of the
bottom section and a closing direction of the upper end of the
trunk section intersect each other on a horizontal projection
plane, and wherein side end portions of two regions of the bottom
member divided by the fold line are planarly bonded to an inside of
the trunk section in an overlapping state.
[0016] In the self-standing packing bag with the spout of the
present invention, since the extending direction of the fold line
of the bottom section and the closing direction of the upper end of
the trunk section intersect each other on the horizontal projection
plane, self-standing ability can be secured since the fold line of
the bottom section spreads in a direction different from the upper
portion of the trunk section even when a gap between the facing
surfaces of the trunk section is gradually narrowed from above so
as to be flat with a decrease in the amount of the contents.
[0017] Further, in the self-standing packing bag with the spout of
the present invention, a bonded portion which is planarly bonded to
the inner surface of the trunk section is formed while the side end
portions of two regions of the bottom member overlap each other.
With this structure, since the lower portion of the trunk section
does not have the bonded portion which prevents the spreading width
of the trunk section, it is possible to prevent the load of the
contents from being locally applied to the upper end of the bonded
portion even when the internal pressure of the bag increases such
as when the bag is dropped and to prevent the breakage from the
bonded portion in advance. Further, even in a state in which the
amount of the contents is small, it is possible to prevent a
problem that the contents are accumulated on the upper end of the
bonded portion and the contents cannot be completely
discharged.
[0018] Further, in the self-standing packing bag with the spout of
the present invention, the spout may have a check valve
function.
[0019] In the self-standing packing bag with the spout with such a
check valve function, air is hardly introduced from the outside
even when the bag is filled with contents such as soy sauce which
is liable to be oxidized or deteriorated by contact with air and
hence the oxidization or deterioration of the contents can be
prevented. On the other hand, when the spout has the check valve
function, in the conventional general packaging bags, adhesion
between the facing surfaces of the trunk section is likely to occur
due to an internal negative pressure with a decrease in the amount
of contents and the trunk section is substantially flat.
Accordingly, it is difficult to secure self-standing ability. For
that reason, a container having a double structure was used in
order to secure self-standing ability. However, since the extending
direction of the fold line of the bottom section and the closing
direction of the upper end of the trunk section intersect each
other on the horizontal projection plane as described above,
self-standing ability can be sufficiently secured only by the
self-standing packing bag formed of a soft and thin material such
as a single-structure laminated film without a double structure
even when the amount of the contents decreases.
Effects of Invention
[0020] According to the self-standing packing bag with the spout of
the present invention, sufficient self-standing ability can be
secured even when the amount of the contents decreases. According
to the self-standing packing bag with the spout of the present
invention, at the same time, the load of the contents is not
locally applied to the upper end of the bonded portion between the
trunk section and the side end portion of the bottom member and the
breakage from the bonded portion can be prevented in advance.
According to the self-standing packing bag with the spout of the
present invention, it is possible to prevent a problem that the
contents are accumulated on the upper end of the bonded portion and
the contents cannot be completely discharged even when the
remaining amount of the contents is small. Further, even when the
spout has the check valve function, self-standing ability can be
secured by the self-standing packing bag formed of a
single-structure laminated film or the like.
BRIEF DESCRIPTION OF DRAWINGS
[0021] FIG. 1 is a perspective view showing a. self-standing
packing bag with a spout of a first embodiment of the present
invention.
[0022] FIG. 2 is a front view of the self-standing packing bag with
the spout of the embodiment.
[0023] FIG. 3 is a bottom view of the self-standing packing bag
with the spout of the embodiment.
[0024] FIG. 4A is a schematic view showing a method of folding a
bottom member before bonding the bottom member to a trunk member in
a self-standing packing bag manufacturing process of the
embodiment.
[0025] FIG. 4B is a schematic view showing the method of folding
the bottom member before bonding the bottom member to the trunk
member in the self-standing packing bag manufacturing process of
the embodiment.
[0026] FIG. 5 is a development view of the self-standing packing
bag showing an example of a state in which the bottom member is
bonded to the trunk member in the manufacturing process.
[0027] FIG. 6 is an enlarged cutaway perspective view showing the
inside of the self-standing packing bag in a circled portion VI of
FIG. 1.
[0028] FIG. 7 is a cross-sectional view showing an example of a
spout of a second embodiment of the present invention.
[0029] FIG. 8 is a longitudinal sectional view of a check valve
incorporated in an exemplary spout of the second embodiment.
[0030] FIG. 9 is a bottom view of the check valve incorporated in
the exemplary spout of the second embodiment.
[0031] FIG. 10A is a schematic view gradually showing a first half
of an exemplary procedure of a method of folding a self-standing
packing bag with a spout of the present invention.
[0032] FIG. 10B is a schematic view gradually showing the first
half of the exemplary procedure of the method of folding the
self-standing packing bag with the spout of the present
invention.
[0033] FIG. 10C is a schematic view gradually showing the first
half of the exemplary procedure of the method of folding the
self-standing packing bag with the spout of the present
invention.
[0034] FIG. 11A is a schematic view gradually showing a second half
of the exemplary procedure of the method of folding the
self-standing packing bag with the spout of the present
invention.
[0035] FIG. 11B is a schematic view gradually showing the second
half of the exemplary procedure of the method of folding the
self-standing packing bag with the spout of the present
invention.
[0036] FIG. 11C is a schematic view gradually showing the second
half of the exemplary procedure of the method of folding the
self-standing packing bag with the spout of the present
invention.
DESCRIPTION OF EMBODIMENTS
[0037] Hereinafter, a self-standing packing bag with a spout of a
first embodiment of the present invention will be described in
detail with reference to FIGS. 1 to 6.
[0038] A self-standing packing bag with a spout 1 of this
embodiment is shown in FIGS. 1 to 3.
[0039] As shown in FIG. 1, the self-standing packing bag with the
spout 1 of this embodiment includes a trunk section 10 which is
formed in a cylindrical shape, a self-standing packing bag 1A which
includes a bottom section 12 provided inside the trunk section 10
so as to close its lower portion, and a spout 14 which is provided
in an upper end portion of the trunk section 10.
[0040] The trunk section 10 is formed by a trunk member 10A formed
of a soft thin material (such as a film or a sheen such as a resin
film. The thin material forming the trunk member 10A is preferably
formed of a laminated film having at least a base material layer
forming the outermost layer and a sealant layer forming the
innermost layer and the following laminated films are exemplary
examples.
[0041] As the base material layer of the trunk member 10A, a film
having excellent printability and further having piercing strength,
tensile strength, impact resistance, and the like is preferable.
Examples of base material layer include polyethylene terephthalate,
polypropylene, polyamide, ethylene vinyl alcohol copolymer, and the
like and a biaxially stretched film or a uniaxially stretched film
is preferable. Further, in order to impart a barrier property to
oxygen and water vapor to these films, a vapor-deposited film
obtained by vapor-depositing a metal such as aluminum or magnesium
or an oxide such as silicon oxide, a coated film coated with a
barrier coating agent such as polyvinylidene chloride, or the like
may be used. The base material layer may be a single unit of the
above-described films or a laminate thereof.
[0042] The sealant layer of the trunk member 10A is a layer that
can be heated and melted to be heat-sealed within a temperature
range that can maintain the shape of the base material layer.
Examples of the material of the sealant layer include polyethylene
such as high-density polyethylene, low-density polyethylene, and
linear low-density polyethylene, polypropylene, and the like and
these unstretched films and those obtained by extruding a resin in
a layered form are preferable.
[0043] The laminated film may have an intermediate layer between
the base material layer and the sealant layer if necessary.
[0044] Examples of the intermediate layer of the trunk member 10A
include films having functionalities such as oxygen barrier
properties, water vapor barrier properties, tearability, piercing
strength, tensile strength, and impact resistance. Specific
examples of the intermediate layer include a metal foil such as
aluminum, the vapor-deposited film, and the coated film.
[0045] The laminated film composed of the base material layer, the
sealant layer, and the intermediate layer used if necessary can be
manufactured by a known method such as a dry lamination method
using an adhesive and an extrusion lamination method using a
heat-adhesive resin.
[0046] Additionally, the trunk member 10A may be a single-layer
film which is formed of a heat-sealable film.
[0047] For example, the trunk section 10 is made by using a
rectangular trunk member 10A such that one end 10Aa and the other
end 10Ab of the trunk member 10A are continuously bonded in a
linear shape in a self-standing direction so as to be formed in a
hollow cylindrical shape on the whole. A portion which is bonded in
this way so that the trunk member 10A has a hollow cylindrical
shape is referred to as a trunk section bonded portion 10a.
Further, the bonding means is not particularly limited as long as
the bonding operation is performed in a liquid-tight manner. For
example, both ends of the trunk member 10A are butted and the
inside of the butted portion is bonded using a bonding film (not
shown). As the bonding film, a film having a double-sided
heat-sealing property formed of a material that can be heat-sealed
with the sealant layer of the trunk member 10A is preferable.
Specific examples include a single-layer film formed of
polyethylene or polypropylene or a multilayer film in which both
layers are formed of polyethylene or polypropylene. It is
preferable to bond the trunk section bonded portion 10a by
heat-sealing using these films. Since it is possible to prevent the
bonded portion from protruding on the outer surface of the trunk
section 10 by applying such a bonding means, the appearance becomes
good and the feeling when holding the self-standing packaging bag
1A by hand also becomes good. Further, both ends of the trunk
member 10A may be bonded by a known method such as envelope seam
sealing and butt seam sealing.
[0048] The upper end of the trunk section 10 is provided with a
closing portion 10b in which a cylindrical opening is closed
linearly. In this embodiment, a part of the closing portion 10b has
a shape cut obliquely with respect to the vertical axis direction
and has a structure in which the contents can be easily discharged.
The closing portion 10b does not need to be essentially formed in a
shape obliquely and the opening may be closed. A means for closing
the closing portion 10b is not particularly limited, but
heat-sealing or the like may be applied.
[0049] The closing portion 10b is provided with a spout member 14A
which is a spout 14 for pouring out the contents. In this
embodiment, the spout member 14A is provided in an obliquely cut
portion of the closing portion 10b. The spout member 14A of this
embodiment has a known configuration formed of a synthetic resin or
the like and may include a bonded portion 14Aa which is bonded to
the trunk section 10 of the self-standing packing bag 1A and a
discharge portion 14Ab which protrudes toward the outside of the
trunk section 10 and discharges the contents.
[0050] Examples of the synthetic resin used for the spout member
14A include polyolefin resin, polyamide resin, polyester resin,
(meth)acrylic resin, vinyl chloride resin, vinylidene chloride
resin, polyether sulfone, ethylene-vinyl alcohol copolymer, and the
like. Among them, polyolefin resins are preferred because of their
excellent workability and low cost. At least the bonded portion
14Aa is preferably formed of a material that can be heat-sealed
with the sealant layer of the trunk member 10A. That is, it is
preferable that the bonded portion 14Aa is formed of the same resin
as the resin constituting the sealant layer.
[0051] Further, a cap 14B which can open and close the opening of
the discharge portion 14Ab of the spout member 14A is provided.
[0052] The bottom section 12 is formed by a bottom member 12A
formed of a soft thin material such as a resin film. As the thin
material forming the bottom member 12A, the same material as that
used for the trunk member 10A can be used. The same thin material
as that of the trunk member 10A or a different thin material may be
used. However, in the case of the bonding by heat-sealing, the
sealant layers are preferably formed of the same type of resin that
can be bonded to each other.
[0053] The bottom section 12 uses the rectangular bottom member 12A
and is half folded at a straight fold line 16 extending from one
end to the other end along the center line thereof. Then, the
bottom section is disposed at the inside of the lower portion of
the trunk section 10 such that the fold line 16 faces upward and
the outer edge portion of the bottom member 12A is bonded to the
lower portion inner surface of the trunk member 10A, so that the
lower portion of the trunk section 10 is closed by the bottom
section 12. Furthermore, the bonding structure and the bonding
method for the bottom member 12A and the trunk member 10A will be
described in detail later again with reference to FIGS. 4A to
6.
[0054] In the self-standing packing bag 1A of this embodiment, as
show in FIG. 3, the closing direction of the upper end of the trunk
section 10, that is, the extending direction D1 of the linear
portion of the closing portion 10b and the extending direction D2
of the fold line 16 in the bottom section 12 intersect each other
at a predetermined angle .theta. while being projected to a
horizontal plane. That is, when bonding the closing portion 10b of
the upper end of the trunk section 10, the closing portion 10b is
bonded so that the extending direction D1 of the closing portion
10b is not parallel to the extending direction D2 of the fold line
16 of the bottom section 12. In this way, since the direction D1 of
the closing portion 10b and the direction D2 of the fold line 16 of
the bottom section 12 intersect each other on the horizontal
projection plane when viewed from the extending direction of the
trunk section, the self-standing packing bag 1A can secure high
self-standing ability since the trunk section 10 is
three-dimensionally spread in different directions at the upper
part and the lower part.
[0055] Here, the intersection angle .theta. is not particularly
limited, but is preferably 90.degree. or an angle close to
90.degree. from the viewpoint of securing higher self-standing
ability.
[0056] Further, the bonding structure of the bottom member 12A and
the trunk member 10A of this embodiment will be described with
reference to FIGS. 4A to 6 in addition to FIGS. 1 to 3.
Furthermore, FIGS. 4A and 4B are schematic views showing a method
of folding the bottom member 12A at a step before the bottom member
12A is bonded to the trunk member 10A. Further, FIG. 5 is a
development view of the self-standing packing bag 1A showing a
state in which side end portions 123 and 124 of the bottom member
12A are bonded to the inner surface of the rectangular trunk member
10A at a step before the trunk member 10A is formed in a
cylindrical shape and FIG. 6 is an enlarged cutaway perspective
view showing the inside of the self-standing packing bag 1A in a
circled portion VI of FIG. 1 in a state in which the side end
portions 123 and 124 of the bottom member 12A are bonded to the
inner surface of the trunk member 10A.
[0057] However, in FIG. 6, the thicknesses of the trunk member 10A,
the bottom member 12A, and the bonding film 132 are drawn to be
extremely thicker than actual ones for easy understanding.
[0058] Here, in the description below, in the trunk section 10, a
vertical plane along the direction D2 of the fold line 16 of the
bottom section 12 is used as a region division reference, a surface
(region) shown on the left front side in FIG. 1 is set as a trunk
section front surface 101, and a rear surface (region) is set as a
trunk section rear surface 102. Further, also in the bottom section
12, the fold line 16 is used as a division reference, a surface
shown on the left front side in FIG. 1 is set as a bottom section
front surface 121 and a rear surface is set as a bottom section
rear surface 122. Similarly, in the bottom member 12A, as shown in
FIGS. 4A and 4B which will be described again, both ends of the
bottom section front surface 121 in a direction along the fold line
direction D2 are referred to as the side end portions 123, both
ends of the bottom section rear surface 122 in a direction along
the fold line direction D2 are referred to as the side end portions
124, an end of the bottom section front surface 121 in a direction
orthogonal to the fold line direction D2 is referred to as a width
end portion 125, and an end of the bottom section rear surface 122
in a direction orthogonal to the fold line direction D2 is referred
to as a width end portion 126.
[0059] As shown in FIG. 6, in both side end portions of the bottom
member 12A, the side end portion 123 of the bottom section front
surface 121 and the side end portion 124 of the bottom section rear
surface 122 overlap each other and the width end portion 125 of the
bottom section front surface 121 and the width end portion 126 of
the bottom section rear surface 122 overlap each other. In this
state, the inner surfaces of the bottom section front surface 121
and the trunk section front surface 101 face each other and the
trunk member 10A and the bottom member 12A overlap each other so
that the lower end 10Ac of the trunk member 10A overlaps the width
end portions 125 and 126 of the bottom member 12A. The bottom
member 12A is folded together with the trunk member 10A and the
side end portions 123 and 124 of the bottom member 12A are bonded
to the inner surface of the trunk section rear surface 102 by the
bonding film 132.
[0060] The means for bonding the side end portions 123 and 124 of
the bottom member 12A and the trunk member 10A is not particularly
limited, but in this embodiment, since the bonding film 132 is
disposed on the inner surface of the trunk section rear surface 102
and the bottom member 12A so as to cover the entire side end
portions 123 and 124 of the bottom member 12A in the height
direction using the bonding film 132 having a double-sided
heat-sealing property and the side end portions 123 and 124 of the
bottom member 12A are heat-sealed to form a bonded portion 150, the
side end portions 123 and 124 of the bottom member 12A are planarly
bonded to the inner surface of the trunk section rear surface 102.
Specific examples of the bonding film having double-sided heat
sealing properties include a single-layer film formed of
polyethylene or polypropylene or a multilayer film formed of
polyethylene or polypropylene on both sides.
[0061] As a procedure of bonding the side end portions 123 and 124
of the bottom member 12A to the trunk member 10A, for example, a
procedure shown in FIGS. 4A to 6 can be applied.
[0062] First, as shown in FIG. 4A, for example, the rectangular
bottom member 12 4 is prepared, the center line is set as the fold
line 16, the bottom member is folded along the fold line 16 so that
the sealant layer surface faces the front side, and the bottom
member is half folded so that the bottom section front surface 121
and the bottom section rear surface 122 overlap each other as shown
in FIG. 4B.
[0063] Then, the bottom member 12A that is half folded as shown in
FIG. 4B is disposed at a position corresponding to the lower side
of the trunk section 10 in a self-standing direction so as to be
located on the side of the sealant layer surface (the inner surface
side of the trunk section 10) of the rectangular trunk member 10A
as shown in FIG. 5.
[0064] Then, the bonding film 132 is disposed on the sealant layer
surface of the trunk member 10A so as to cover the entire side end
portions 123 and 124 of the bottom member 124 in the height
direction by using the bonding film 132 having a double-sided
heat-sealing property and the sealant layer surface of the trunk
member 10A, the bottom member 12A, and the bonding film 132 are
heat-sealed across the entire side end portions 123 and 124 of the
bottom member 124 in the height direction so as to form the bonded
portion 150. Since the bottom section front surface 121 is bonded
to the sealant layer surface of the trunk member 10A in the side
end portion 123 of the bottom member 12A by the bonded portion 150
so that the side end portions 123 and 124 of the bottom member 12A
are closed, the side end portions 123 and 124 of the bottom member
12A are bonded to the sealant layer surface of the trunk member
10A.
[0065] After the side end portions 123 and 124 of the bottom member
12A are planarly bonded to the trunk member 10A in this way, one
end 10Aa and the other end 10Ab of the trunk member 10A are
linearly butted along the self-standing direction of the trunk
section 10 and the butted portion is bonded by heat-sealing or the
like using an adhesive tape as described above so as to form the
trunk section bonded portion 10a. Accordingly, the trunk member 10A
is formed in a cylindrical shape so that the bonded surface of the
bottom member 12A is located at the inside. At this time, as
indicated by an arrow P in FIG. 6, the side end portions 123 and
124 of the bottom member 12A are folded together with the trunk
member 10A.
[0066] Then, the width end portions 125 and 126 of the bottom
member 12A are bonded to the lower portion inner surface of the
trunk member 10A by heat-sealing so as to form the lower end seal
portion 130. In addition, the lower end seal portion 130 may be
formed in a linear shape, but a boat shape is preferable from the
viewpoint of easy opening of the bottom section 12. Accordingly,
the lower end seal portion 130 has a boat shape in FIGS. 1 and
2.
[0067] As described above, the lower portion of the trunk section
10 is closed by the bottom section 12.
[0068] Further, since the closing portion 10b is formed by closing
the upper end portion of the trunk section 10 by a heat-sealing
method or the like in a direction intersecting the extending
direction of the fold line 16 of the bottom section 12 on the
horizontal projection plane and the closing portion lob is provided
with the spout 14, the self-standing packing bag with the spout 1
is formed. In the case of the self-standing packing bag with the
spout 1 of this embodiment, the spout member 14A is inserted into
the upper end portion of the trunk section 10 before closing the
closing portion 10b and the bonded portion 14Aa of the spout member
14A is sandwiched by the trunk section 10 and is heat-sealed to be
the closing portion 10b. Accordingly, the self-standing packing bag
with the spout 1 is formed.
[0069] The bonded portion 150 of the trunk member 10A and the side
end portions 123 and 124 of the bottom member 12A of this
embodiment is planarly bonded to the inner surface of the trunk
section 10 while the side end portions 123 and 124 of the bottom
member 12A overlap each other. For that reason, as shown in FIG. 6,
the trunk section 10 spreads in the width direction on the whole
also in the lower portion of the bottom section 12. Thus, there is
no bonded portion that disturbs the spreading of the trunk section
and protruding toward the inside of the trunk section as described
in Patent Document 1 and it is possible to prevent the riding of
the contents on the upper end of the bonded portion even when the
contents are stored. As a result, it is possible to prevent the
load of the contents from being locally applied to the upper end of
the bonded portion and to prevent the breakage from the bonded
portion in advance. Further, it is possible to prevent a problem
that the contents cannot be discharged completely since the
contents are accumulated on the upper end of the bonded portion
even when the remaining amount of the contents is small.
[0070] For self-standing ability, since the direction D1 of the
closing portion 10b of the upper end of the trunk section 10 and
the direction D2 of the fold line 16 of the bottom section 12
intersect each other on the horizontal projection plane as
described above, the self-standing packing bag 1A can secure
self-standing ability since the lower portion of the trunk section
10 three-dimensionally spreads and the facing inner surfaces hardly
move close to be in close contact with each other even when the
amount of the contents decreases. Further, in this embodiment,
since the trunk section bonded portion 10a for forming the trunk
member 10A in a cylindrical shape is continuous from the upper end
to the lower end, the trunk section bonded portion 10a functions as
a support column. Furthermore, since the bonded portion 150 with
respect to the trunk section 10 in the side end portions 123 and
124 of the bottom section 12 also functions as a support column,
self-standing ability is more excellent.
[0071] Further, in this embodiment, the spout is formed by the
spout member, but the present invention is not limited thereto. In
short, any structure that allows communication between the inside
and the outside of the packaging bag may be used. Thus, for
example, the spout may be formed such that a part of the thin
material of the trunk member protrudes outward and the protruding
portion is cut off with scissors or the like to be opened. Further,
the spout can be also formed such that the upper end of the trunk
section is closed over the entire width and the closed portion is
cut off with scissors or the like to be opened.
[0072] In this embodiment, the bonding film 132 is disposed on each
of the side end portions 123 and 124 of the bottom member 12A, but
the present invention is not limited thereto. For example, the
entire bottom member 12A may be covered. In that case, the bonding
film has a width exceeding both end portions 123 and 124 of the
bottom member 12A and is folded together with the fold line 16 of
the bottom member 12A to be disposed on the trunk member 10A.
[0073] In a self-standing packing bag with a spout of a second
embodiment, the spout has a check valve function. The self-standing
packing bag of this embodiment is the same as the self-standing
packing bag with the spout of the first embodiment except that the
spout has a check valve function. Here, the check valve function
means a function that allows the flow of contents (fluid) from the
inside of the packaging bag to the outside and does not suck fluid
such as air from the outside even when the amount of contents
decrease and the inside tends to have a negative pressure. In this
way, when the spout has a check valve function, air is hardly
introduced from the outside even when the bag is tilled with
contents such as soy sauce which is liable to be oxidized or
deteriorated by contact with air and hence the oxidization or
deterioration of the contents can be prevented.
[0074] When the spout has the check valve function, in the
conventional general packaging bags, adhesion between the facing
surfaces of the trunk section is likely to occur due to a decrease
in the amount of contents and the three-dimensionality of the
packaging bag is lost to be a flat shape. Accordingly, it is
difficult to secure self-standing ability. For that reason, it was
necessary to have a double structure using a self-standing
container at the outside in order to secure self-standing ability.
In contrast, in the self-standing packing bag with the spout of the
present invention, since the upper portion and the lower portion
have different facing surfaces of the trunk section, excellent
self-standing ability is maintained even when the facing surfaces
of the trunk section move close to each other due to a decrease in
the amount of the contents as described above. Accordingly, even
when the spout has the check valve function, self-standing ability
can be sufficiently secured only by the self-standing packing bag
with the spout formed of a soft and thin material such as a
single-structure laminated film without a double structure.
Further, it is easy to visually check a decrease in the amount of
the contents from the outside. Furthermore, the manufacture is easy
and the cost is low. Therefore, it is very excellent as a packaging
bag for soy sauce or the like, which is liable to be oxidized or
deteriorated when exposed to air.
[0075] An example of a specific structure of the spout 14 having a
check valve function of the second embodiment will be described
below with reference to FIGS. 7 to 9. Further, FIG. 7 shows an
overall configuration of the spout 14 having a check valve function
and FIGS. 8 and 9 show a check valve 200 incorporated in the spout
14.
[0076] As shown in FIG. 7, the spout 14 having the check valve
function includes the spout member 14A which includes the bonded
portion 14Aa located at the inside of the trunk member 10A at the
upper end of the trunk section 10 of the self-standing packing bag
with the spout 1 and sandwiched between the inner surfaces of the
trunk member 10A and the discharge portion 14Ab bonded to the upper
end of the bonded portion 14Aa and holding the check valve 200, the
check valve 200 which is incorporated in the spout member 14A, and
the cap 14B which is threaded into the upper end of the spout
member 14A.
[0077] Flanges 204A and 204B are formed to protrude in two steps on
the lower outer periphery of the discharge portion 14Ab. The bonded
portion 14Aa is located at the inside of the trunk member 10A and
is bonded to the trunk member 10A while being sandwiched between
the inner surfaces of the trunk member 10A.
[0078] For example, as shown in FIGS. 8 and 9, the check valve 200
includes a hollow cylindrical member 210 and a valve member 211.
The valve member 211 includes a spout member 212, an urging member
214 that has, for example, a coil spring shape and of which a base
end portion 214a is supported by the inner end portion of the spout
member 212, and a valve body 216 which is provided at the lower end
of the urging member 214, the spout member 212 is fixed to one end
(the upper end in FIG. 8) of the cylindrical member 210 in the
axial direction, and the valve member 211 is fixed to the
cylindrical member 210 so that the urging member 214 and the valve
body 216 are built in the cylindrical member 210. An inlet 218 of
the lower end of the cylindrical member 210 is provided with a
valve seat portion 220. The urging member 214 is configured to
close the inlet 218 by pressing the valve body 216 against the
valve seat portion 220. The inside of the spout member 212 is
provided with a pouring passage 212A of which a lower end
communicates with the cylindrical member 210 and an upper end is
provided with a pouring outlet 212Aa.
[0079] The urging member 214 is used to urge the valve body 216 in
a direction in which the valve body 216 is pressed against the
valve seat portion 220 of the inlet 218 at a predetermined pressure
and an elastic urging force is set such that the inlet 218 is
closed in a normal state (a state in which no pressure is applied
to the self-standing packaging bag with the spout 1 from outside by
fingers to pour out contents) and the urging member is elastically
compressed by the pressure from the inside of the self-standing
packing bag with the spout 1 so as to form a gap between the valve
body 216 and the valve seat portion 220 and open the inlet 218 in a
state in which a certain degree of a pressure is applied to the
self-standing packing bag with the spout 1 from the outside by
fingers.
[0080] In the spout 14 with the check valve 200, the valve body 216
is pressed against the valve seat portion 220 so that the inlet 218
is closed in a normal state, that is, a state in which no pressure
is applied to the self-standing packing bag with the spout 1 from
the outside by fingers so as to pour out the contents. Then, in
this state, air is prevented from entering the spout 14 from the
outside to the inside of the self-standing packaging bag with the
spout 1 via the spout 14 regardless of the presence or absence of
the cap 14B. On the other hand, when the cap 14B is separated and a
certain degree or more of a pressure is applied to the
self-standing packing bag with the spout 1 from the outside by
fingers, a pressure is applied from the self-standing packing bag
with the spout 1 to the valve body 216. Then, when the pressure
becomes larger than the urging force of the urging member 214, the
urging member 214 is elastically compressed and a gap is formed
between the valve body 216 and the valve seat portion 220 so that
the inlet 218 is opened. Thus, the contents in the self-standing
packing bag with the spout 1 can pass from the inlet 218 through
the passage 224 in the cylindrical member 210 and the pouring
passage 212A of the spout member 212 and can be poured from the
pouring outlet 212Aa to the outside of the self-standing packing
bag with the spout 1.
[0081] Further, the structure of the check valve is not limited to
the above-described check valve. In short, the check valve may have
a check function.
[0082] In the self-standing packing bag with the spout of the
present invention, since the extending direction of the fold line
of the bottom section intersects the closing direction of the upper
end of the trunk section, the three-dimensional shape is maintained
even when the contents are not stored. When transporting or storing
such a self-standing packing bag with the spout in a state in which
the contents are not stored, it is preferable to fold the bag into
a flat shape so as to save a space and maintain a stable
posture.
[0083] As a folding method, for example, there is a method
gradually shown in FIGS. 10A, 10B, 10C, 11A, 11B, and 11C. This
method will be described next. FIG. 11A shows a step to be
performed next to FIG. 10C.
[0084] FIG. 10A schematically shows the self-standing packing bag
with the spout 1 of the first embodiment before the bag not filled
with the contents is folded. From this state, as shown in FIG. 10B,
a lower portion (a portion including the bottom section 12) 300C of
the trunk section 10 of the self-standing packing bag with the
spout 1 is made flat along the extending direction of the fold line
16 of the bottom section 12. That is, the bottom section front
surface 121 and the bottom section rear surface 122 which are
divided by the fold line 16 of the bottom section 12 overlap each
other so that the lower portion 300C of the self-standing packing
bag with the spout 1 is made flat. Next, the upper portion 300A of
the trunk section 10 or the closing portion 10b of the upper end is
made flat in the extending direction. Here, in the lines descending
from both side end portions of the closing portion 10b of the trunk
section 10, the lower end points where the upper portion of the
trunk section 10 is flat are referred to as upper portion lower end
side end portions 305 and 306. At this time, an intermediate
portion 300B between the flat upper portion 300A and the fiat lower
portion 300C of the trunk section 10 spreads three-dimensionally.
Here, a three-dimensional intermediate portion below the upper
portion lower end side end portion 305 in the trunk section front
surface 101 is referred to as an intermediate portion front surface
portion 301 and a three-dimensional intermediate portion below the
upper portion lower end side end portion 306 in the trunk section
rear surface 102 is referred to as an intermediate portion rear
surface portion 302.
[0085] Next, as shown in FIG. 10C, in the lower portion 300C of the
trunk section 10, a line following the fold line 16 of the bottom
section 12 and connecting both side ends of the trunk section 10 is
used as a first auxiliary fold line 303A for folding, the trunk
section 10 and the bottom section 12 located below the first
auxiliary fold line 303A are set as the lower part 304, and the
lower part 304 is folded forward by 90.degree. in an overlapping
flat state. Further, in some cases, the lower part 304 may be
folded forward by 180.degree. in an overlapping flat state, but
here, in order to make the figure of the subsequent procedure easy
to understand, the subsequent procedure will be described by
assuming that the lower part 304 is folded forward by 90.degree. in
an overlapping flat state as described above.
[0086] Further, as shown in FIGS. 11A to 11B, the intermediate
portion front surface portion 301 is mountain-folded along a second
auxiliary fold line 303B and a third auxiliary fold line 303C which
are hypotenuses of a triangle so that the intermediate portion
front surface portion 301 forms a triangle in which the upper
portion lower end side end portion 305 is an apex and the first
auxiliary fold line 303A is a base. Similarly, a fourth auxiliary
fold line 303D and a fifth auxiliary fold line 303E which are
hypotenuses of a triangle are mountain-folded so that the
intermediate portion rear surface portion 302 forms a triangle in
which the upper portion lower end side end portion 306 is an apex
and the first auxiliary fold line 303A is a base.
[0087] In a state shown in FIG. 11B, the self-standing packing bag
with the spout 1 still has a three-dimensional shape, but the
intermediate portion 300B of the trunk section 10 is also flat on
the same plane as the lower portion 300C. Here, as shown in FIGS.
11B to 11C, the upper portion 300A of the trunk section 10 is
folded along a fifth auxiliary fold line 307 which is a line
connecting the upper portion lower end side end portions 305 and
306 corresponding to the apexes of the above-described triangle and
is inclined on the same plane as the intermediate portion 300B and
the lower portion 300C. Accordingly, as shown in FIG. 11C, the
entire self-standing packing bag with the spout 1 is made flat.
[0088] Further, the triangle in which the upper portion lower end
side end portion 305 is an apex and the first auxiliary fold line
303A is a base and the triangle in which the upper portion lower
end side end portion 306 is an apex and the first auxiliary fold
line 303A is a base are isosceles triangles when the extending
direction of the fold line 16 of the bottom section 12 intersects
the extending direction of the closing portion 10b closing the
upper end of the trunk section 10 at 90.degree..
[0089] Further, in the method of folding the self-standing packing
bag with the spout, the intermediate portion of the trunk section
may be folded before the upper portion of the trunk section is made
flat. Furthermore, in the description above, a folding method from
the lower portion of the trunk section has been described, but a
folding method from the upper portion of the trunk section may be
used.
[0090] Further, instead of folding the lower part 304 shown in FIG.
10C by 90.degree. in an overlapping flat state, the lower part 304
may be folded backward by 90.degree. in an overlapping flat state,
but is preferably folded forward as shown in FIG. 10C. This is
because the trunk section bonded portion 10a having a more
complicated structure than the trunk section front surface 101 is
folded by 90.degree. and 180.degree. (when the lower part faces
reversely in FIG. 11B) when the lower part is folded backward. In
this case, the folding is difficult.
[0091] Further, in the manufactured self-standing packing bag with
the spout, since there is a case in which the lower portion or the
upper portion of the bottom section and the trunk section may be
flat, a state shown in FIG. 10A may be omitted in that case.
[0092] Although the preferred embodiments of the present invention
have been described, the above-described embodiments are merely
examples within the scope of the spirit of the present invention
and the components can be added, omitted, substituted, and modified
in other forms without departing from the spirit of the present
invention. That is, the present invention is not limited to the
description above, is limited only by the accompanied claims, and
can be, of course, appropriately modified within its scope.
INDUSTRIAL APPLICABILITY
[0093] According to the present invention, since it is possible to
provide the self-standing packing bag with the spout including: the
trunk section which is formed in a cylindrical shape and of which
the upper end is closed; the bottom section which is attached to
the lower portion of the trunk section; and the spout which is
attached to the upper end of the trunk section, it is possible to
reliably secure self-standing ability and to reduce the possibility
of the bag breakage at the upper end of the bonded portion with a
structure in which contents hardly ride on a bonded portion between
the trunk section and the bottom section.
REFERENCE SIGNS LIST
[0094] 1: Self-standing packing bag with spout
[0095] 10: Trunk section
[0096] 10A: Trunk member
[0097] 10b: Closing portion
[0098] 12: Bottom section
[0099] 12A: Bottom member
[0100] 123, 124: Side end portion of bottom member
[0101] 14: Spout
[0102] 16: Fold line
* * * * *