CN114126975B - Packaging bag (GY) - Google Patents
Packaging bag (GY) Download PDFInfo
- Publication number
- CN114126975B CN114126975B CN202080051748.8A CN202080051748A CN114126975B CN 114126975 B CN114126975 B CN 114126975B CN 202080051748 A CN202080051748 A CN 202080051748A CN 114126975 B CN114126975 B CN 114126975B
- Authority
- CN
- China
- Prior art keywords
- sealing
- layer
- front surface
- packaging bag
- steam
- 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.)
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Links
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 45
- 238000007789 sealing Methods 0.000 claims abstract description 71
- 239000006260 foam Substances 0.000 claims abstract description 32
- 239000000463 material Substances 0.000 claims description 15
- 238000005187 foaming Methods 0.000 claims description 14
- 229920005989 resin Polymers 0.000 claims description 10
- 239000011347 resin Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 238000009413 insulation Methods 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 92
- 229920005672 polyolefin resin Polymers 0.000 description 5
- 239000007787 solid Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 235000013611 frozen food Nutrition 0.000 description 3
- 230000002093 peripheral effect Effects 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
- 238000010030 laminating Methods 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
- 239000000758 substrate Substances 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
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 239000005001 laminate film Substances 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
- 238000000465 moulding Methods 0.000 description 1
- 229920001778 nylon Polymers 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
- 238000000638 solvent extraction Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
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 a content. According to the present invention, there is provided a packaging bag comprising a flexible film welded to a sealing portion, wherein the packaging bag comprises a steam discharge sealing portion forming a steam flow path as an internal pressure rises, the film comprises a foam 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 its contents by a microwave oven.
Background
Patent document 1 discloses a packaging bag for frozen foods which generates water vapor by heating, comprising a laminate film formed by simultaneously extruding a foamed layer made of a polyolefin resin and a solid layer made of a polyolefin resin by means of an inflation molding machine, and when the packaging bag is used for sealing and packaging frozen foods and directly heated by means of a microwave oven, popping sound is emitted and broken when the packaging bag is edible.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 2015-20746
Disclosure of Invention
(problem to be solved by the invention)
The package bag of patent document 1 is heated by a microwave oven, and the internal pressure of the package bag increases, so that the package bag breaks, and the steam inside the package bag is released. The characteristics of patent document 1 are: the size of the rupture hole formed at the time of rupture is made small by combining the foamed layer and the solid layer, but it is difficult to completely control the formation site of the rupture hole in the package bag and to completely exclude the possibility that the contents are leaked out due to the site of formation of the rupture hole.
The present invention has been made in view of such circumstances, and provides a packaging bag which is excellent in heat insulation and can suppress leakage of a content.
(means for solving the problems)
According to the present invention, there is provided a packaging bag comprising a flexible film having a foam layer and a steam discharge seal portion forming a steam flow path in response to an increase in internal pressure, the flexible film being welded to the seal portion, the steam discharge seal portion being provided in the seal portion.
The packaging bag of the present invention is composed of a film having a foamed layer, and therefore has excellent heat insulation properties. Further, since the steam discharge seal portion is provided in the seal portion of the film, when the internal pressure rises with heating by the microwave oven, a steam flow path is formed in the steam discharge seal portion, and the steam inside the packaging bag is discharged. This can always form a steam flow path at a specific position, thereby suppressing leakage of the contents.
Various embodiments of the present invention are illustrated below. The embodiments shown below may be combined with each other.
Preferably, the packaging bag is a packaging bag in which the film is provided with a notch at a position closer to the outside of the packaging bag than the inner edge of the steam discharge 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 foam layer, and a sealing layer in this order from the outer surface side of the packaging bag, and the sealing layer is made of a resin having a lower melting point than the base material layer.
Preferably, the packaging bag is a packaging bag in which the steam discharge seal portion includes a spot seal portion, and the thickness of the seal layer in the spot seal portion is smaller than the thickness of the seal layer in other portions of the steam discharge seal portion.
Preferably, the package bag is a package bag having a wall thickness of 50 μm or less of the seal layer in the spot seal portion.
Drawings
Fig. 1 shows a package 1 according to embodiment 1 of the present invention, in which fig. 1A is a perspective view and fig. 1B is a plan view of the vicinity of a steam discharge seal portion 6c.
FIG. 2 is a section A-A of FIG. 1B.
Fig. 3 is a right side view showing a state in which the package bag 1 in a sealed state accommodating the contents is heated.
Fig. 4 is a cross-sectional view showing a portion corresponding to the region a in fig. 2 in a state after the steam flow passage penetrating the foam 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 corresponding to the region a in fig. 2.
Fig. 6 is a cross-sectional view showing a state after a steam flow path penetrating the foam layer 9b is formed in the package bag 1 of fig. 5.
Fig. 7 is a plan view corresponding to fig. 1B, showing another embodiment of the steam discharge seal portion 6c.
Detailed Description
Embodiments of the present invention are described below. Various features illustrated in the embodiments shown below can be combined with each other. Each feature is independently established.
1. Embodiment 1
As shown in fig. 1A, a package bag 1 according to embodiment 1 of the present invention is configured by forming a flexible film 9 into a bag shape. The package 1 includes a front surface portion 2 and a rear surface portion 3. The front surface portion 2 and the rear surface portion 3 are welded by heat sealing at a sealing portion 4. The seal portion 4 includes a top seal portion 4t formed along the upper side 1t of the package 1 and a side seal portion 4s formed along the right side 1r or the left side 1 l. The lower edge 1b of the package 1 is not welded before accommodating the contents, and the bottom seal 4b is formed by accommodating the contents in the package 1 and then welding the same. Thus, the sealing portion 4 is provided around the entire periphery of the package 1, and the inside of the package 1 is sealed.
As shown in fig. 2, the film 9 is preferably a laminated film formed by laminating a plurality of layers including a base material layer 9a, a foam layer 9b, and a sealing layer 9c, and the sealing layer 9c is the innermost layer. The sealing layer 9c is preferably a non-foamed (solid) layer. In the sealing portion 4, the sealing layers 9c are welded to each other. In one example, the film 9 may be formed by laminating films each including the base material layer 9a, the foam layer 9b, and the sealing layer 9 c.
The base material layer 9a is preferably made of a resin such as nylon, ethylene- α -olefin copolymer, polypropylene, high-density polyethylene, linear low-density polyethylene, polyethylene terephthalate, or the like. The thickness of the base layer 9a outside 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 material layer 9 a. The sealing layer 9c is composed of, for example, an olefin resin such as a low-density polyethylene, a linear low-density polyethylene, a medium-density polyethylene, a high-density polyethylene, a propylene-ethylene copolymer, or an olefin resin modified by grafting another ethylenically unsaturated carboxylic acid or an anhydride thereof, a polyamide resin having a relatively low melting point or a low softening point, a polyester resin, or an ethylene-vinyl acetate copolymer resin. The thickness of the sealing layer 9c outside the sealing portion 4 is, for example, 25 to 60 μm, preferably 30 to 50 μm.
The foaming layer 9b may be composed of the resin mentioned in the above description about the base material layer 9a or the sealing layer 9c, preferably, a resin having a lower melting point than the base material layer 9 a. The foaming 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. If the expansion ratio is less than 1.2 times, it is difficult to form foam, whereas if it exceeds 3.5 times, it is difficult to form uniform foam. The expansion ratio means: density of resin before foaming/density of foamed layer after foaming (bulk density). The foaming layer 9b preferably includes a plurality of connected cells connected by connecting the cells in addition to the individual cells. At this time, a steam flow path is easily formed through the foam layer 9 b. The thickness of the foam layer 9b outside the sealing portion 4 is, for example, 30 to 80. Mu.m, preferably 40 to 70. Mu.m.
The surface of the foam layer 9b has irregularities derived from bubbles. Since the sealing layer 9c covers the foaming layer 9b, the uneven shape of the foaming 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 bubbles, the light transmittance is low. Therefore, the contents sealed in the package 1 cannot be seen from the outside, and are beautiful.
The foamed layer 9b is excellent in heat insulation. Therefore, when the frozen food is contained in the packaging bag 1, frosting on the surface of the packaging bag 1 can be suppressed. Further, the increase in the surface temperature of the packaging bag 1 when the contents are heated by the microwave oven can be suppressed. Therefore, the possibility of being scalded when the surface of the packaging bag 1 is touched immediately after heating by the microwave oven can be suppressed.
The film 9 is not limited to the configuration shown in fig. 2, and may be formed by arranging the base material layer 9a, the sealing layer 9c, and the foaming layer 9b in this order. At least one of the base material layer 9a and the sealing layer 9c may be omitted. The substrate layer 9a, the foam layer 9b, and the sealing layer 9c may be provided. For example, a print layer or an adhesive layer may be provided between the base material layer 9a and the foam layer 9 b. The base material 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 2u. The front surface lower portion 2d and the front surface upper portion 2u are respectively welded to the rear surface portion 3. As shown in fig. 2, the front surface lower portion 2d and the front surface upper portion 2u are connected at a superposed portion 5 formed by superposing in a mutually folded state. As shown in fig. 1A, at the overlapping portion 5, the front surface lower portion 2d and the front surface upper portion 2u are welded at a pair of side seal portions 6a, a pair of end seal portions 6b, and a steam discharge seal portion 6c. In the overlapping portion 5, a side seal portion 6a is provided 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 6c. The end seal portion 6b narrows in width from the side seal portion 6a toward the steam discharge seal portion 6c. As shown in fig. 1B, the steam discharge 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 package bag 1. A notch 12 is provided at a position closer to the outside of the package 1 than the inside edge 6c1 and adjacent to the inside edge 6c 1.
As shown in fig. 1B, a spot seal portion 6c2 is provided near the front stage of the steam discharge seal portion 6c. The spot seal portion 6c2 preferably protrudes further toward the inside of the package bag 1 than the inner edge 6c1 of the steam discharge seal portion 6c. 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 spot seal portion 6c2. At this time, the resin flows around when the spot sealing portion 6c2 is formed, and a thick portion (not shown) may be formed around the periphery of the spot sealing portion 6c2. Further, since the sealing layer 9c is formed of a resin having a lower melting point than the base material layer 9a, the degree of thinning of the sealing layer 9c becomes particularly high in the spot seal portion 6c2. The thickness of the sealing layer 9c at the spot seal 6c2 is smaller than the thickness of the sealing layer 9c at other portions of the vapor discharge seal 6c. In the spot sealing portion 6c2, the foam layer 9b may be a solid layer by breaking bubbles at the time of pressing. In the spot seal portion 6c2, the seal strength is weakened by thinning of the seal layer 9c, so that a steam flow path is easily formed in the steam discharge seal portion 6c. The thickness of the sealing layer 9c at the spot sealing portion 6c2 is preferably 50 μm or less. The thickness is, for example, 1 to 50. Mu.m, specifically, 1, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50. Mu.m, or any of the values between 2 values exemplified herein. If the thickness is too large, it is difficult to discharge the vapor, and the side seal 6a may be peeled off.
After the package 1 is filled with the contents, a bottom seal 4b is formed on the lower side 1b of the package 1 as shown in fig. 3. Whereby the inside of the package 1 is sealed.
When the packaging bag 1 filled with the contents is heated by the microwave oven, the internal pressure of the packaging bag 1 is raised by the steam generated from the moisture contained in the contents, and as shown in fig. 3, the packaging bag 1 is inflated, whereby the seal in the vicinity of the front end of the substantially V-shaped 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 having no foam layer 9b, the films welded to the steam discharge 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 from each other to form a gap therebetween, thereby forming a steam flow path, and therefore the cross-sectional area of the steam flow path tends to be large. Thus, when the steam flow path is formed, a large amount of steam is immediately discharged, so that the internal pressure of the packaging bag 1 is rapidly reduced, and the stewing effect of the contents is easily reduced.
On the other hand, in the packaging bag 1 having the foam layer 9b as in the present embodiment, as shown in fig. 4, when the steam flow path 6d communicating the interior of the packaging bag 1 and the foam layer 9b is formed by starting the peeling at the steam discharge seal portion 6c as the internal pressure increases, steam can be discharged to the outside through the steam flow path 6d, the foam layer 9b, and the notch 12. Since a large number of bubbles are present in the foam layer 9b and the thickness of the partition wall partitioning the adjacent bubbles is extremely thin, the flow path of the steam is easily broken by the pressure of the steam. Since the notch 12 is provided adjacent to the inner edge of the steam discharge seal portion 6c, steam passing through the steam flow path in the foam layer 9b is rapidly 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 package bag 1 is discharged at a low rate, and the effect of stewing the contents is improved. In the case where the notch 12 is not provided in the packaging bag 1, there is a possibility that the steam passing through the steam flow path in the foam layer 9b can be discharged from the end face of the film 9.
2. Embodiment 2
Embodiment 2 of the present invention will be described with reference to fig. 5 to 6. Similar to embodiment 1, this embodiment is different in the structure of the spot sealing portion 6c2, and is a main difference. Hereinafter, description will be made centering on the distinguishing point.
In embodiment 1, the spot sealing 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 spot sealing 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 spot sealing portion 6c2 is formed in this way, the foam layer 9b1 on the pressed side (the front surface lower portion 2d side in the present embodiment) heats up to a higher degree than the foam layer 9b2 on the non-pressed side (the front surface upper portion 2u side in the present embodiment), and the bubbles are likely to collapse. Therefore, the air permeability of the foam layer 9b2 is higher than that of the foam layer 9b1. When the internal pressure of the packaging bag 1 increases, as shown in fig. 6, the steam flow path 6d extending to the foam layer 9b2 is easily formed. As a result, as the internal pressure of the packaging bag 1 increases, the steam in the packaging bag 1 is discharged to the outside through the steam flow path 6d, the foam layer 9b2, and the notch 12.
Since the front surface upper portion 2u of the overlapping portion 5 is formed by concavely folding the film, when the front surface upper portion 2u of the overlapping portion 5 forms a steam port, steam is discharged, and the contents hardly leak out when the package bag 1 is collapsed.
3. Other embodiments
The invention may also be implemented as follows.
The package 1 may be in a shape that can be raised.
The steam discharge seal portion 6c is not limited to a substantially V-shape, but may be U-shaped or the like.
In the above embodiment, the outer edge 6c3 and the inner edge 6c1 of the steam discharge seal portion 6c are similar in shape (i.e., substantially V-shaped), but the outer edge 6c3 may be other shapes. 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 position. For example, the sealing portion 4 (the top sealing portion 4t, the side sealing portion 4s, or the bottom sealing portion 4 b) at the peripheral edge of the package bag 1 may be provided in a convex shape of the steam discharge sealing portion 6c, or the steam discharge sealing portion 6c connected to the sealing portion 4 at the peripheral edge may be provided, or the steam discharge sealing portion 6c may be provided independently of the sealing portion 4 at the peripheral edge.
(symbol description)
1: packaging bag, 1b: the following, 1l: left side, 1r: right side, 1t: upper edge, 2: front surface portion, 2d: front surface lower part, 2u: front surface upper part, 3: rear surface portion, 4: sealing part, 4b: bottom seal, 4s: side seal portion, 4t: top seal, 5: overlapping portion, 6a: side seal portion, 6b: end seal portion, 6c: steam discharge seal portion, 6c1: inboard edge, 6c2: spot sealing part, 6d: steam flow path, 7: steam discharge seal part, 9: film, 9a: substrate layer, 9b: foaming layer, 9b1: foaming layer, 9b2: foaming layer, 9c: sealing layer, 12: and (5) a notch.
Claims (3)
1. A packaging bag comprising a flexible film welded at a seal portion, wherein,
the package has a front surface portion and a rear surface portion,
the front surface portion and the rear surface portion are welded at the sealing portion by heat sealing,
the front surface portion has a front surface lower portion and a front surface upper portion,
the front surface lower portion and the front surface upper portion are respectively welded to the rear surface portion,
the front surface lower portion and the front surface upper portion are connected at a superposed portion formed by superposing in a mutually folded state,
the packaging bag is provided with a steam discharge sealing part which forms a steam flow path along with the rise of internal pressure,
the film is provided with a layer of foam,
the steam discharge sealing part is arranged on the sealing part,
a notch is provided in the film at a position closer to the outside of the package than the inside edge of the steam discharge seal portion and adjacent to the inside edge,
the film comprises a base material layer, the foaming layer and a sealing layer from the outer surface side of the packaging bag in sequence,
the sealing layer is composed of a resin having a lower melting point than the base material layer,
the steam discharge sealing part is provided with a point sealing part,
the thickness of the sealing layer at the point sealing portion is smaller than the thickness of the sealing layer at other portions of the vapor discharge sealing portion,
when the steam flow path connecting the inside of the packaging bag and the foam layer is formed by starting the peeling of the steam discharge seal portion as the internal pressure of the packaging bag increases, the steam moves through the spot seal portion via the steam flow path and the foam layer, moves through the foam layer after passing through the spot seal portion, and is discharged to the outside via the notch,
the spot sealing portion is formed by heating while pressing from one side of the overlapping portion.
2. The package of claim 1 wherein,
the sealing layer at the point sealing portion has a wall thickness of 50 μm or less.
3. The packaging bag according to claim 1 or 2, wherein,
the one side is the front surface lower side.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-140887 | 2019-07-31 | ||
| JP2019140887A JP2021024573A (en) | 2019-07-31 | 2019-07-31 | Packaging bag |
| PCT/JP2020/028649 WO2021020330A1 (en) | 2019-07-31 | 2020-07-27 | Packaging bag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114126975A CN114126975A (en) | 2022-03-01 |
| CN114126975B true 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 |
| 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 |
| 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 |
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| JPH11310278A (en) * | 1998-04-30 | 1999-11-09 | Meiwa Packs:Kk | Packaging body having perfect sealing property and automatic pressure control function |
| 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 |
| JP2017218180A (en) * | 2016-06-06 | 2017-12-14 | 株式会社Ｒｉｎｎｓ | Packaging bag and film sheet for packaging bag |
| 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 WO PCT/JP2020/028649 patent/WO2021020330A1/en active Application Filing
- 2020-07-27 CN CN202080051748.8A patent/CN114126975B/en active Active
- 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 |
| 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 |
| 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 |
|---|---|
| JP2021024573A (en) | 2021-02-22 |
| WO2021020330A1 (en) | 2021-02-04 |
| TW202110722A (en) | 2021-03-16 |
| CN114126975A (en) | 2022-03-01 |
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