CN114126975A - Packaging bag (WU JI KE LI) - Google Patents
Packaging bag (WU JI KE LI) Download PDFInfo
- Publication number
- CN114126975A CN114126975A CN202080051748.8A CN202080051748A CN114126975A CN 114126975 A CN114126975 A CN 114126975A CN 202080051748 A CN202080051748 A CN 202080051748A CN 114126975 A CN114126975 A CN 114126975A
- Authority
- CN
- China
- Prior art keywords
- packaging bag
- layer
- sealing
- steam
- seal portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 67
- 238000007789 sealing Methods 0.000 claims abstract description 45
- 239000000565 sealant Substances 0.000 claims description 11
- 229920005989 resin Polymers 0.000 claims description 10
- 239000011347 resin Substances 0.000 claims description 10
- 239000006260 foam Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims 1
- 238000009413 insulation Methods 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 93
- 238000005187 foaming Methods 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 6
- 229920005672 polyolefin resin Polymers 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 235000013611 frozen food Nutrition 0.000 description 3
- -1 polypropylene Polymers 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 229920000092 linear low density polyethylene Polymers 0.000 description 2
- 239000004707 linear low-density polyethylene Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 229920001179 medium density polyethylene Polymers 0.000 description 1
- 239000004701 medium-density polyethylene Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920005653 propylene-ethylene copolymer Polymers 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D33/00—Details of, or accessories for, sacks or bags
- B65D33/01—Ventilation or drainage of bags
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package
- B65D81/3446—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package specially adapted to be heated by microwaves
- B65D81/3461—Flexible containers, e.g. bags, pouches, envelopes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Food Science & Technology (AREA)
- Package Specialized In Special Use (AREA)
- Bag Frames (AREA)
- Wrappers (AREA)
Abstract
Provided is a packaging bag which has excellent heat insulation properties and can prevent leakage of contents. According to the present invention, there is provided a packaging bag configured such that a flexible film is welded to a sealing portion, wherein the packaging bag is provided with a steam discharge sealing portion which forms a steam flow path in accordance with an increase in internal pressure, the film is provided with a foamed layer, and the steam discharge sealing portion is provided in the sealing portion.
Description
Technical Field
The present invention relates to a packaging bag suitable for heating the contents thereof with a microwave oven.
Background
Patent document 1 discloses a packaging bag for frozen food which generates steam by heating, which is composed of a laminated film formed by simultaneously extruding a foamed layer composed of a polyolefin-based resin and a solid layer composed of a polyolefin-based resin by means of a blow molding machine, and when it is used to seal-pack the frozen food and directly heated by a microwave oven, popping sound and breaking are given out when it is edible.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2015-20746
Disclosure of Invention
(problems to be solved by the invention)
The packaging bag of patent document 1 is heated in a microwave oven to increase the internal pressure of the packaging bag, and the packaging bag is broken to release steam from the inside of the packaging bag. The features of patent document 1 are: the size of the rupture opening formed at the time of rupture is reduced by combining the foamed layer and the solid layer, but it is difficult to completely control the formation portion of the rupture opening in the packaging bag, and it is difficult to completely eliminate the possibility that the contents are leaked out due to the formation portion of the rupture opening.
The present invention has been made in view of such circumstances, and provides a packaging bag which has excellent heat insulation properties and can suppress leakage of contents.
(means for solving the problems)
According to the present invention, there is provided a packaging bag comprising a flexible film welded to a sealing portion, the packaging bag comprising a steam discharge sealing portion which forms a steam flow path in response to an increase in internal pressure, wherein the film comprises a foamed layer, and the steam discharge sealing portion is provided in the sealing portion.
The packaging bag of the present invention is excellent in heat insulation properties because it is composed of a film having a foamed layer. Further, since the steam discharge seal portion is provided in the seal portion of the film, when the internal pressure rises due to heating in the microwave oven, a steam flow path is formed in the steam discharge seal portion to discharge the steam inside the packaging bag. This makes it possible to form the steam flow path at a specific position at all times, thereby suppressing leakage of the built-in components.
Various embodiments of the present invention are exemplified below. The embodiments shown below can be combined with each other.
Preferably, the packaging bag is a packaging bag in which a notch is provided in the film at a position closer to the outside of the packaging bag than the inner edge of the steam vent seal portion and adjacent to the inner edge.
Preferably, the packaging bag is a packaging bag in which the film includes a base material layer, the foamed layer, and a sealant layer in this order from the outer surface side of the packaging bag, and the sealant layer is made of a resin having a lower melting point than the base material layer.
Preferably, the packaging bag is one in which the steam vent seal portion includes a spot seal portion, and the thickness of the seal layer at the spot seal portion is smaller than the thickness of the seal layer at another portion of the steam vent seal portion.
Preferably, the packaging bag has a thickness of the sealing layer in the spot sealing portion of 50 μm or less.
Drawings
Fig. 1 shows a packaging bag 1 according to embodiment 1 of the present invention, fig. 1A is a perspective view, and fig. 1B is a plan view of the vicinity of a steam vent seal portion 6 c.
Fig. 2 is a sectional view taken along line a-a in fig. 1B.
Fig. 3 is a right side view showing a state in which the packaging bag 1 in a sealed state accommodating the contents is heated.
Fig. 4 is a cross-sectional view of a portion corresponding to the area a in fig. 2, showing a state after the steam flow path penetrating the foamed layer 9b is formed.
Fig. 5 is a cross-sectional view of a portion of the packaging bag 1 according to embodiment 2 of the present invention, which portion corresponds to the area a in fig. 2.
Fig. 6 is a cross-sectional view showing a state after a steam flow path penetrating through foam layer 9b is formed in packaging bag 1 of fig. 5.
Fig. 7 is a plan view corresponding to fig. 1B, showing another mode of the steam discharge seal portion 6 c.
Detailed Description
The following describes embodiments of the present invention. Various feature items exemplified in the embodiments shown below can be combined with each other. Further, each feature independently establishes the invention.
1. Embodiment 1
As shown in fig. 1A, a packaging bag 1 according to embodiment 1 of the present invention is configured by forming a flexible film 9 into a bag shape. The packaging bag 1 includes a front surface 2 and a rear surface 3. The front surface portion 2 and the rear surface portion 3 are welded by heat sealing at the sealing portion 4. The seal 4 includes a top seal 4t formed along the upper side 1t of the packaging bag 1 and a side seal 4s formed along the right side 1r or the left side 1 l. The bottom side 1b of the packaging bag 1 is not welded before the contents are stored, and the contents are stored in the packaging bag 1 and then welded to form a bottom seal portion 4 b. Thus, the sealing portion 4 is provided over the entire circumference of the packaging bag 1, and the inside of the packaging bag 1 is sealed.
As shown in fig. 2, the film 9 is a laminated film preferably composed of a plurality of layers including a base layer 9a, a foamed layer 9b, and a sealant layer 9c laminated thereon, and the sealant layer 9c is an innermost layer. The sealing layer 9c is preferably a non-foamed (solid) layer. In the seal portion 4, the seal layers 9c are welded to each other. In one example, the film 9 may be formed by laminating films each composed of the base layer 9a, the foamed layer 9b, and the sealant layer 9 c.
The base layer 9a is preferably made of a resin such as nylon, ethylene- α -olefin copolymer, polypropylene, high-density polyethylene, linear low-density polyethylene, or polyethylene terephthalate. The thickness of the base material layer 9a other than the sealing portion 4 is, for example, 30 to 100 μm, preferably 40 to 80 μm.
The sealing layer 9c is preferably made of a resin having a lower melting point than the base layer 9 a. The sealing layer 9c is made of, for example, an olefin resin such as low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, propylene-ethylene copolymer, olefin resin graft-modified with other ethylenically unsaturated carboxylic acid or anhydride thereof, a polyamide resin having a relatively low melting point or low softening point, a polyester resin, or an ethylene-vinyl acetate copolymer resin. The thickness of the sealing layer 9c other than the sealing portion 4 is, for example, 25 to 60 μm, preferably 30 to 50 μm.
The foamed layer 9b may be made of the resin mentioned in the above description of the base layer 9a or the sealant layer 9c, and is preferably made of a resin having a lower melting point than the base layer 9 a. The foamed layer 9b is preferably made of an olefin resin (preferably polyethylene).
The foaming ratio of the foaming layer 9b is, for example, 1.2 to 3.5 times, preferably 2.0 to 3.0 times, and more preferably 2.3 to 2.8 times. When the expansion ratio is less than 1.2 times, it is difficult to form a foam, and when it exceeds 3.5 times, it is difficult to form a uniform foam. The expansion ratio is: density of resin before foaming/density of foamed layer after foaming (bulk density). The foaming layer 9b preferably includes a plurality of interconnected cells connected to each other in addition to the single cells. At this time, the steam flow path is easily formed through the foaming layer 9 b. The thickness of the foamed layer 9b outside the sealing part 4 is, for example, 30 to 80 μm, preferably 40 to 70 μm.
The surface of the foamed layer 9b has irregularities derived from bubbles. Since the sealing layer 9c covers the foamed layer 9b, the uneven shape of the foamed layer 9b is also reflected on the sealing layer 9c, and the uneven shape is also formed on the surface of the sealing layer 9 c. The concave-convex shape can improve the sliding property of the built-in object.
Since the foamed layer 9b contains a large number of cells, the light transmittance is low. Therefore, the contents sealed in the packaging bag 1 cannot be seen from the outside, and the packaging bag looks beautiful.
The foamed layer 9b is excellent in heat insulation. Therefore, when the frozen food is stored in the packaging bag 1, the frost formation on the surface of the packaging bag 1 can be suppressed. Further, the rise of the surface temperature of the packaging bag 1 when the contents are heated in the microwave oven can be suppressed. Therefore, it is possible to suppress the possibility of being burned when the surface of the packaging bag 1 is contacted immediately after heating with the microwave oven.
The film 9 is not limited to the configuration shown in fig. 2, and may be formed by arranging the base layer 9a, the sealant layer 9c, and the foam layer 9b in this order. At least one of the base layer 9a and the sealing layer 9c may be omitted. Further, a layer other than the base layer 9a, the foamed layer 9b, and the sealant layer 9c may be provided. For example, a printing layer or an adhesive layer may be provided between the base layer 9a and the foamed layer 9 b. The base layer 9a may be formed of a plurality of layers.
As shown in fig. 1A, the front surface portion 2 includes a front surface lower portion 2d and a front surface upper portion 2 u. The front surface lower portion 2d and the front surface upper portion 2u are welded to the rear surface portion 3, respectively. As shown in fig. 2, the front surface lower portion 2d and the front surface upper portion 2u are connected to each other at an overlapping portion 5 formed by overlapping in a mutually folded state. As shown in fig. 1A, the front surface lower portion 2d and the front surface upper portion 2u are welded to the pair of side seal portions 6a, the pair of end seal portions 6b, and the steam discharge seal portion 6c at the overlapping portion 5. The side seal portion 6a is provided at the overlapping portion 5 at a position along the right side 1r and the left side 1 l. The end seal portion 6b is provided to connect the side seal portion 6a and the steam discharge seal portion 6 c. The end seal portion 6b is narrowed in width from the side seal portion 6a toward the steam discharge seal portion 6 c. As shown in fig. 1B, the steam vent seal portion 6c has a substantially V-shape, and the inner edge 6c1 thereof also has a substantially V-shape curved toward the inside of the packaging bag 1. The notch 12 is provided closer to the outer side of the package 1 than the inner side edge 6c1 and adjacent to the inner side edge 6c 1.
As shown in fig. 1B, a point seal portion 6c2 is provided near the front stage of the steam discharge seal portion 6 c. The spot sealing portion 6c2 preferably protrudes further toward the inside of the packaging bag 1 than the inside edge 6c1 of the steam vent sealing portion 6 c. After the formation of the steam discharge seal portion 6c, heat sealing may be performed with a force stronger than the compressive strength at the time of forming the steam discharge seal portion 6c to form the point seal portion 6c 2. At this time, when the dot seal portion 6c2 is formed, the resin flows around, so that a thick portion (not shown) may be formed at the peripheral edge of the dot seal portion 6c 2. Further, since the sealant layer 9c is formed of a resin having a lower melting point than that of the base material layer 9a, the degree of thinning of the sealant layer 9c becomes particularly high at the point sealing portion 6c 2. The thickness of the seal layer 9c at the point seal portion 6c2 is smaller than the thickness of the seal layer 9c at other portions of the steam discharge seal portion 6 c. In the point seal portion 6c2, the foam layer 9b may be a solid layer by breaking the bubbles at the time of pressing. In the point seal portion 6c2, the seal strength is weakened by thinning the seal layer 9c, and therefore, a steam flow path is easily formed in the steam discharge seal portion 6 c. The thickness of the sealing layer 9c in the spot sealing portion 6c2 is preferably 50 μm or less. The thickness is, for example, 1 to 50 μm, specifically, for example, 1, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 μm, and may be in a range of any 2 values exemplified herein. This is because if the thickness is too large, it is difficult to discharge the steam, and peeling may occur at the side seal portion 6 a.
After the package bag 1 is filled with the contents, as shown in fig. 3, a bottom seal portion 4b is formed on the lower side 1b of the package bag 1. Whereby the inside of the packing bag 1 is sealed.
When the packaging bag 1 filled with the content is heated in the microwave oven, the internal pressure of the packaging bag 1 is increased by the steam generated from the moisture contained in the content, and as shown in fig. 3, the packaging bag 1 is expanded, whereby the seal in the vicinity of the substantially V-shaped tip of the steam discharge seal portion 6c is peeled off, a steam flow path is formed, and the steam is discharged to the outside through the steam flow path.
In the packaging bag 1 not having the foamed layer 9b, the films welded to the steam vent seal portion 6c (here, the film constituting the front surface lower portion 2d and the film constituting the front surface upper portion 2 u) are completely peeled off to form a gap therebetween, and thereby a steam flow path is formed, and therefore the cross-sectional area of the steam flow path is likely to increase. Thus, if the steam flow path is formed, a large amount of steam is immediately discharged to rapidly decrease the internal pressure of the packaging bag 1, and the braising effect of the contents is easily decreased.
On the other hand, in the packaging bag 1 having the foamed layer 9b as in the present embodiment, as shown in fig. 4, when the peeling of the steam discharge sealing portion 6c is started with the increase of the internal pressure and the steam flow path 6d communicating the inside of the packaging bag 1 and the foamed layer 9b is formed, the steam can be discharged to the outside through the steam flow path 6d, the foamed layer 9b, and the notch 12. Since a large number of bubbles are present in the foamed layer 9b and the thickness of the partition wall separating adjacent bubbles is very thin, the bubble is easily broken by the pressure of the steam to form a flow path for the steam. Since the notch 12 is provided at a position adjacent to the inner edge of the steam discharge seal portion 6c, the steam passing through the steam flow path in the foam layer 9b is quickly discharged from the notch 12. The cross-sectional area of the steam flow path formed by such a principle is very small. Therefore, the steam in the packaging bag 1 is discharged slowly, and the stewing effect of the built-in objects is improved. In the case where the notch 12 is not provided in the packaging bag 1, the steam passing through the steam flow path in the foam layer 9b may be discharged from the end face of the film 9.
2. Embodiment 2
In embodiment 1, the dot seal portion 6c2 is formed by heating while pressing from both sides of the overlapping portion 5, but in this embodiment, as shown in fig. 5, the dot seal portion 6c2 is formed by heating while pressing from one side (preferably, the front surface lower portion 2d side) of the overlapping portion 5.
When the dot seal portion 6c2 is formed in this way, the foamed layer 9b1 on the side to be pressed (front surface lower portion 2d side in the present embodiment) is heated to a higher degree than the foamed layer 9b2 on the side not to be pressed (front surface upper portion 2u side in the present embodiment), and the bubbles are easily broken. Therefore, the air permeability of the foamed layer 9b2 is higher than that of the foamed layer 9b 1. When the internal pressure of the packaging bag 1 rises, as shown in fig. 6, the steam flow path 6d extending to the foam layer 9b2 is easily formed. As a result, the steam inside the packaging bag 1 is discharged to the outside through the steam flow path 6d, the foamed layer 9b2, and the notch 12 as the internal pressure of the packaging bag 1 increases.
Since the front upper portion 2u of the overlapping portion 5 is formed by folding the film concavely, when the steam port is formed in the front upper portion 2u of the overlapping portion 5, the contents are hard to leak when the packaging bag 1 is shrunk by discharging the steam.
3. Other embodiments
The present invention can also be implemented in the following manner.
The packaging bag 1 may have a shape capable of standing up.
The steam discharge seal portion 6c is not limited to a substantially V-shape, but may be U-shape or the like.
In the above embodiment, the outer edge 6c3 of the steam discharge seal 6c and the inner edge 6c1 have similar shapes (i.e., substantially V-shaped), but the outer edge 6c3 may have another shape. For example, as shown in fig. 7, the outer edge 6c3 may have a linear shape. In the above embodiment, the notch 12 is provided in the unsealed portion, but in the embodiment of fig. 7, the notch 12 may be provided in the sealed portion.
The overlapping portion 5 may be omitted. At this time, the steam discharge seal portion 6c is provided at another place. For example, the steam vent seal portion 6c may be provided in a convex shape at the peripheral seal portion 4 (the top seal portion 4t, the side seal portion 4s, or the bottom seal portion 4b) of the packaging bag 1, or the steam vent seal portion 6c may be provided in connection with the peripheral seal portion 4, or the steam vent seal portion 6c may be provided separately from the peripheral seal portion 4.
(symbol description)
1: packaging bag, 1 b: the following, 1 l: left side, 1 r: right side, 1 t: upper side, 2: front surface portion, 2 d: front surface lower portion, 2 u: front surface upper portion, 3: rear surface portion, 4: sealing portion, 4 b: bottom seal portion, 4 s: side seal portion, 4 t: top seal, 5: overlapping portion, 6 a: side seal portion, 6 b: end seal portion, 6 c: steam discharge seal, 6c 1: inside edge, 6c 2: dot seal portion, 6 d: steam flow path, 7: steam discharge seal portion, 9: film, 9 a: base material layer, 9 b: foaming layer, 9b 1: foaming layer, 9b 2: foaming layer, 9 c: sealing layer, 12: and (4) a notch.
Claims (5)
1. A packaging bag, which is constructed by welding a flexible film to a seal part,
comprises a steam discharge sealing part which forms a steam flow path along with the rise of the internal pressure,
the film is provided with a foamed layer,
the steam discharge sealing part is provided to the sealing part.
2. The packaging bag according to claim 1, wherein,
the film is provided with a notch at a position closer to the outside of the packaging bag than the inner side edge of the steam discharge seal portion and adjacent to the inner side edge.
3. The packaging bag according to claim 1 or 2,
the film comprises a base material layer, the foam layer, and a sealant layer in this order from the outer surface side of the packaging bag,
the sealing layer is made of a resin having a melting point lower than that of the base layer.
4. The packaging bag according to claim 3, wherein,
the steam discharge sealing part is provided with a point sealing part,
the thickness of the sealing layer at the spot sealing portion is smaller than the thickness of the sealing layer at other portions of the steam discharge sealing portion.
5. The packaging bag according to claim 3 or 4,
the wall thickness of the sealing layer in the spot sealing portion is 50 μm or less.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019140887A JP2021024573A (en) | 2019-07-31 | 2019-07-31 | Packaging bag |
| JP2019-140887 | 2019-07-31 | ||
| PCT/JP2020/028649 WO2021020330A1 (en) | 2019-07-31 | 2020-07-27 | Packaging bag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114126975A true CN114126975A (en) | 2022-03-01 |
| CN114126975B CN114126975B (en) | 2024-01-09 |
Family
ID=74229151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080051748.8A Active CN114126975B (en) | 2019-07-31 | 2020-07-27 | Packaging bag (GY) |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2021024573A (en) |
| CN (1) | CN114126975B (en) |
| TW (1) | TW202110722A (en) |
| WO (1) | WO2021020330A1 (en) |
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| JPH0418273A (en) * | 1990-04-27 | 1992-01-22 | Toyo Alum Kk | Food package |
| JPH11310278A (en) * | 1998-04-30 | 1999-11-09 | Meiwa Packs:Kk | Packaging body having perfect sealing property and automatic pressure control function |
| JP2001287774A (en) * | 2000-04-06 | 2001-10-16 | Dainippon Printing Co Ltd | Packaging bag corresponding to microwave oven and packaging material used therein |
| JP2012086497A (en) * | 2010-10-21 | 2012-05-10 | Tosoh Corp | Foamed laminate for microwave oven cooking |
| JP2013086871A (en) * | 2011-10-14 | 2013-05-13 | Shinwa Sangyo Kk | Method of manufacturing packaging bag or bag packaging body of microwave cooking food, and packaging bag or bag packaging body of microwave cooking food |
| JP2013163546A (en) * | 2012-02-13 | 2013-08-22 | Kyoraku Co Ltd | Packaging bag |
| JP5468169B1 (en) * | 2013-09-20 | 2014-04-09 | 日生化学株式会社 | Packaging bag for heating |
| CN103998350A (en) * | 2011-12-28 | 2014-08-20 | 京洛株式会社 | Packaging bag |
| CN104010947A (en) * | 2011-12-28 | 2014-08-27 | 京洛株式会社 | Packaging bag |
| JP2017218180A (en) * | 2016-06-06 | 2017-12-14 | 株式会社Ｒｉｎｎｓ | Packaging bag and film sheet for packaging bag |
| WO2018008117A1 (en) * | 2016-07-06 | 2018-01-11 | 日生化学株式会社 | Packaging bag |
| JP2019038594A (en) * | 2017-08-28 | 2019-03-14 | 凸版印刷株式会社 | Packaging bag |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001130624A (en) * | 1999-11-08 | 2001-05-15 | Daicel Chem Ind Ltd | Thermoplastic resin sheet |
| JP2003225978A (en) * | 2002-02-01 | 2003-08-12 | Sumitomo Chem Co Ltd | Foamed polypropylene resin sheet |
| WO2018003117A1 (en) * | 2016-07-01 | 2018-01-04 | 三菱電機株式会社 | Communication system and communication method |
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2019
- 2019-07-31 JP JP2019140887A patent/JP2021024573A/en active Pending
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2020
- 2020-07-27 CN CN202080051748.8A patent/CN114126975B/en active Active
- 2020-07-27 WO PCT/JP2020/028649 patent/WO2021020330A1/en active Application Filing
- 2020-07-28 TW TW109125408A patent/TW202110722A/en unknown
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| JPH0418273A (en) * | 1990-04-27 | 1992-01-22 | Toyo Alum Kk | Food package |
| JPH11310278A (en) * | 1998-04-30 | 1999-11-09 | Meiwa Packs:Kk | Packaging body having perfect sealing property and automatic pressure control function |
| JP2001287774A (en) * | 2000-04-06 | 2001-10-16 | Dainippon Printing Co Ltd | Packaging bag corresponding to microwave oven and packaging material used therein |
| JP2012086497A (en) * | 2010-10-21 | 2012-05-10 | Tosoh Corp | Foamed laminate for microwave oven cooking |
| JP2013086871A (en) * | 2011-10-14 | 2013-05-13 | Shinwa Sangyo Kk | Method of manufacturing packaging bag or bag packaging body of microwave cooking food, and packaging bag or bag packaging body of microwave cooking food |
| CN103998350A (en) * | 2011-12-28 | 2014-08-20 | 京洛株式会社 | Packaging bag |
| CN104010947A (en) * | 2011-12-28 | 2014-08-27 | 京洛株式会社 | Packaging bag |
| JP2013163546A (en) * | 2012-02-13 | 2013-08-22 | Kyoraku Co Ltd | Packaging bag |
| JP5468169B1 (en) * | 2013-09-20 | 2014-04-09 | 日生化学株式会社 | Packaging bag for heating |
| JP2017218180A (en) * | 2016-06-06 | 2017-12-14 | 株式会社Ｒｉｎｎｓ | Packaging bag and film sheet for packaging bag |
| WO2018008117A1 (en) * | 2016-07-06 | 2018-01-11 | 日生化学株式会社 | Packaging bag |
| JP2019038594A (en) * | 2017-08-28 | 2019-03-14 | 凸版印刷株式会社 | Packaging bag |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021020330A1 (en) | 2021-02-04 |
| TW202110722A (en) | 2021-03-16 |
| JP2021024573A (en) | 2021-02-22 |
| CN114126975B (en) | 2024-01-09 |
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