JP2001171756A - Packaging bag and package having self pressure regulating function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag and a package having self pressure regulating functions in a packaging format employing a mechanism for making a sealant layer easy to peel wherein (i) the format can be designed so that it is reliably broken when a predetermined internal pressure is reached, and (ii) even in the case of the package which receives an object not to be heated such as a foodstuff with a tray in a pillow-type packaging bag comprising a hutt-seamed seal strip along an approximate center line of the barrel on one of surfaces of the bag, the bag can be broken only from a specific region on side seal strips of both side rims when the internal pressure is raised. SOLUTION: The sealant layer 2 of the bag made of a laminate sheet comprising a base sheet 1 and the sealant layer 2 is constituted of a plurality of polyolefin based resin layers including a first layer 2a to be an internal surface of the bag and a second layer 2b adjacent to the first layer 2a. Peeling strength values P25, P90 of an interface between the first 2a and the second 2b layers of the seal of the bag at 25 deg.C and 90 deg.C are set to 1.0 to 2.5 kg/15 mm and 0.01 to 0.2 kg/15 mm, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a packaging bag capable of automatically releasing the internal pressure when the food reaches a predetermined internal pressure when the food is heated or cooked in a microwave oven. And packaging.

[0002]

2. Description of the Related Art When a package containing food in a bag is heated or cooked in a microwave oven as it is, the inside of the package is over-pressurized by generated steam, and finally the package is ruptured. Contents may squirt or splatter into the range. Such a rupture not only causes loss of food, contamination in the microwave oven, shortens the life of the microwave oven, but also poses a danger to the surrounding people.

[0003] Therefore, prior to cooking using a heater such as a microwave oven, it is necessary for the consumer to scratch the bag with scissors or a cutter. When is small, it is not possible to effectively prevent the contents from spurting or scattering due to rupture. On the other hand, when the degree of damage is large, the steaming effect of the food becomes insufficient. Therefore, it is desirable to adopt a method of providing a mechanism for releasing pressure in the bag itself constituting the package so as not to cause excessive pressure.

Conventionally, various mechanisms have been proposed to release excessive pressure. One of the mechanisms (first mechanism) is to provide a through hole for escape of water vapor in a bag or a container. In addition, there is a system in which the escape holes are covered with a label-like film and are automatically opened when the inside is pressurized, and many applications have been filed.

As another mechanism (a second mechanism) related to the present invention, a mechanism in which a sealant layer has an easy peeling property has been proposed as exemplified below.

For example, Japanese Utility Model Publication No. 2-15789 (Japanese Utility Model Application Publication No. Sho 62-45235) discloses a packaging bag for a microwave oven in which packaging materials made of a heat-resistant synthetic resin layer are heat-bonded to each other. , There is shown a packaging bag for a microwave oven, in which at least a part of the thermal bonding portion of the peripheral edge is a non-stretched polypropylene film and the other is a mixed resin film of polypropylene and polyethylene. In addition, although the test was performed using both of the above films, a polyester film on the outer surface of those films,
There is also a description that a heat-resistant reinforcing material such as a nylon film or a paper base may be laminated, and both films may be arranged only on a part of the periphery of the packaging bag.

Japanese Patent Application Laid-Open No. 5-319444 discloses a packaging bag in which a sealant easy to delaminate is laminated on the inner surface of a base film, and the sealants are heat-bonded with the sealants facing each other. I have. In the embodiment, a sealant having a three-layer structure is used, and delamination occurs in any part of the sealant and the sealant is opened.

[0008]

However, a packaging bag for a microwave oven disclosed in Japanese Utility Model Publication No. 2-15789, which employs the above-mentioned second mechanism (a mechanism for making the sealant layer easy peelable), and Japanese Unexamined Patent Publication No. HEI 5-15789. In any of the packaging bags disclosed in JP-A-319444, even if the bag is ruptured when the pressure inside the bag is increased, it is unstable in terms of the internal pressure at which the rupture occurs. In some cases, the steaming effect may be insufficient, or the steam may burst after being in an excessively pressurized state. In addition, it is impossible to predict where in the heat seal portion the bag will break.

Further, in a package in which food is stored in a pillow packaging bag without a tray or on a tray,
There is a torso seal band along almost the center line of the torso on one side of the pillow packaging bag, so when subjected to microwave heating, only when the bag breaks from the side seal bands on both sides of the bag Alternatively, the bag may be broken from the torso sealing band. Therefore, when heating in a microwave oven, the upper part of the torso seal band should be on the upper side. During heating or cooking, consumers usually place the torso with the torso seal band down (even if there is a cautionary note that the torso with the torso seal band up). ), You will be struggling with product design.

[0010] Under such a background, the present invention is directed to a packaging form employing a mechanism for making the sealant layer easy peelable, and (i) reliably breaking the bag when a predetermined internal pressure is reached. That can be designed to
(ii) In addition, even if the package body contains non-heated items such as food with trays in a pillow packaging bag in which a torso-sealed seal band exists along the substantially center line of the torso on one side of the bag, When it rises, the bag can be broken only from a specific part of the side seal band on both sides, so that heating or cooking by microwave oven can be performed with the side with the trunk gasket seal band facing down. It is an object of the present invention to provide a packaging bag and a package having an automatic pressure regulation function provided with functions such as what can be performed.

[0011]

According to the present invention, there is provided a packaging bag or package having an automatic pressure regulation function, which is formed from a laminated sheet having a layer structure of a base material sheet (1) / a sealant layer (2). Alternatively, in a package body in which contents are filled and packaged, the sealant layer (2) is a first layer on the inner surface side of the bag.
(2a) and a second layer (2b) adjacent to the first layer (2a), comprising a multi-layer polyolefin resin layer, and,
The first in the sealing part when it is a packaging bag or package
The peel strength at the interface between the layer (2a) and the second layer (2b) depends on the temperature 2
When the peel strengths at 5 ° C. and 90 ° C. are P ₂₅ and P ₉₀ , respectively, P ₂₅ is 1.0 to _2.5 kg / 15 mm, P ₉₀
Is 0.01 to 0.2 kg / 15 mm.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.

<Laminated Sheet> In the packaging bag of the present invention or the package body in which contents are filled and packaged, the bag is formed by laminating the base sheet (1) / the sealant layer (2). Bags are made from sheets. The filling of the contents may be performed at the time of bag making, or may be performed after the bag making.

<Base Sheet (1)> As the base sheet (1), a single-layer or multi-layer plastic film is preferably used. Particularly important plastics films are biaxially stretched nylon film, biaxially stretched polypropylene film, biaxially stretched polyester film,
Examples include a relatively high melting point non-stretched nylon film and a relatively high melting point non-stretched polypropylene film. These films may be those coated with a gas barrier resin such as polyvinylidene chloride or ethylene-vinyl alcohol copolymer, or those obtained by laminating layers of these gas barrier resins. Further, a layer such as a transparent vapor-deposited layer, paper, or a nonwoven fabric may be included together with the plastic film. The thickness of the plastic film in the base sheet (1) is often about 8 to 50 μm.

<Sealant layer (2)> Sealant layer (2)
Is the first layer (2a), which is the inner surface of the bag (the heat-sealed surface during bag making)
And a second layer (2b) adjacent to the first layer (2a). "First layer (2
a) / second layer (2b), for example, a "first layer (2a) /" to which a third layer (2c) similar to the second layer (2b) is added.
Second layer (2b) / third layer (2c) ". Since the latter configuration is symmetrical, there is an advantage that curling when forming the sealant layer (2) is prevented.

The above-mentioned sealant layer (2) (a first layer (2a) on the inner surface side of the bag and a second layer (2b) adjacent to the first layer (2a))
Is preferably composed of a coextruded multilayer film from the viewpoint of the production process. The lamination with the base sheet (1) at this time is usually performed by a dry lamination method. However, the lamination of the base sheet (1) and the sealant layer (2) can be carried out by co-extruding the respective layers constituting the sealant layer (2) on the base sheet (1) via an anchor coating layer, or by laminating the base sheet.
It is also possible to perform sandwich extrusion lamination of (1) and the sealant layer (2).

Each layer constituting the sealant layer (2) can be arbitrarily designed as long as it exhibits a peel strength as described below, as long as it is a polyolefin resin layer. A specific example is as follows.

First, as the first layer (2a) on the inner surface side of the bag, a blended layer of linear low-density polyethylene and low-density polyethylene, a low-density polyethylene layer, an ethylene-vinyl acetate copolymer layer, an ethylene-vinyl acetate layer, Examples include an acrylate copolymer layer, an ionomer, and an ethylene-rich ethylene-propylene copolymer. Among these, a blend layer of linear low-density polyethylene and low-density polyethylene is particularly important, and the blend ratio of linear low-density polyethylene to low-density polyethylene at this time is 15:85 to 50: 50, especially 20: 80-45:
55, above all, often in the range of 25:75 to 40:60.

Examples of the second layer (2b) adjacent to the first layer (2a) include a polypropylene layer and a high-density polyethylene layer. Here, a layer suitable for the polypropylene layer is a layer of a propylene-based polymer (copolymer or terpolymer) called CPP.

"First layer (2a) / second layer (2b) / third layer (2c)"
As the third layer (2c), a layer similar to the first layer (2a) or a linear low-density polyethylene (for example, having a density of 0.9
45 to 0.900, especially 0.935 to 0.910).

The thickness of each layer constituting the sealant layer (2) can be appropriately set, but the thickness of the first layer (2a) is 3 to 20 μm.
m (especially 5 to 15 μm), and the second layer (2b) is 5 to 50 μm
(Especially 10 to 40 μm) and a second layer more than the first layer (2a).
It is desirable that the layer (2b) be thicker. Third
The layer (2c) is optional and need not be provided, but if provided, it is 3 to 20 μm (particularly 5 to 15 μm
).

In the above description, since the first layer (2a) and the second layer (2b) have a great influence on the peel strength at the interface between the two layers described below, pay sufficient attention to the resin composition and the film thickness. It is desirable to select the optimal design in consideration of experimental knowledge.

<Exfoliation of interface between first layer (2a) and second layer (2b)>
Strength) and, in the present invention, a packaging bag or package.
Between the first layer (2a) and the second layer (2b) in the sealing portion
Is required to have a specific range of peel strength at the interface
You. That is, at the temperature of 25 ° C. and 90 ° C.
Peel strength is P _{twenty five}, P₉₀And P_{twenty five}But
1.0 ~ 2.5kg / 15mm 、 P₉₀Is 0.01-0.2kg / 15mm
is necessary. The preferred range is P_{twenty five}Is 1.1 ~ 2.0kg / 15
mm, P₉₀Is 0.02 to 0.15kg / 15mm. Particularly preferred range
The box is P_{twenty five}Is 1.2-1.8kg / 15mm, P₉₀Is 0.03-0.10kg / 1
5 mm.

[0024] When the peel strength P ₂₅ is too small, since the sealing deficient in handling steps of the package, unreliable in terms of preservability of the contents. On the other hand, increasing the peel strength P ₂₅ itself does not cause any particular problem. However, if the peel strength P ₂₅ is excessively increased, the combination of the resins used for the first layer (2a) and the second layer (2b) becomes difficult. Disappears. next,
If the peel strength _P90 is too small, the steaming effect during heating or cooking will be insufficient. On the other hand, when the peeling strength _P90 is too large, the sealing strength becomes excessive, so that the bag becomes too swelled at the time of heating in the microwave oven, and the internal pressure up to the breaking of the bag becomes large, so that the bag breaking portion becomes large, and is severe. Sometimes, when the bag is broken, the contents may squirt or splatter.

<Packaging bag and package> As described above,
In the packaging bag of the present invention or the package body in which the contents are filled and packaged, the bag is made from a laminated sheet having a layer structure of base material sheet (1) / sealant layer (2). The filling of the contents may be performed at the time of bag making, or may be performed after the bag making.

Any bag can be used as long as it has a heat seal portion (seal band) on at least one of the four sides or on the body.

In this case, since a particularly important thing is a pillow packaging bag or a pillow package, such a pillow packaging system will be described in detail below.

The pillow wrapping bag or pillow wrapping body has a torso-sealed sealing band (S ₁ ) extending toward both ends of the bag along substantially the center line of the torso of one side of the bag, and at least one of the two ends. And an edge sealing band (S ₂ ) for sealing the edge.
The method of pillow packaging by the automatic filling machine is as follows: (a) The contents (with or without a tray) are rolled up and traversed at a predetermined pitch while sticking on the back (spreading the trunk of the body) Horizontal pillow packaging, heat sealing in the direction, then cutting at the center of the heat sealing zone;
There is a vertical pillow package in which contents are filled from above while a cylindrical sheet is provided with a seal serving as a bottom portion in a transverse direction. In addition, when filling the contents by manual filling or semi-automatic method, a method of filling the contents into a pillow packaging bag having an opening and then heat sealing the opening is adopted.

In the above-mentioned pillow packaging, as shown in a plan view in FIG. 1 and a bottom view in FIG. 2 described later, the shape of the edge seal band (S ₂ ) is (S ₁ )
At the portion where the edge seal band (S ₂ ) of the C-shaped portion is bent, and the width d of the edge seal band (S ₂ ) at the C-shaped portion is changed to the shape of the edge seal band (S It is particularly desirable to make the band width D smaller than the band width D in the other portions of ₂ ). Note that the band width d refers to the narrowest portion of the C shape.

As shown in FIG. 7, various modifications can be made to the C-shaped portion of the edge seal band (S ₂ ) which is formed into a C-shaped curve. However, in FIG. 7, the torso seal band (S ₁ ) is omitted for simplicity.

The band width d is 20 to 70% of the band width D, especially 3
Suitably, it is set to 0 to 60%. Generally, the band width D is often about 10 mm in consideration of the reliability of the seal. Therefore, for example, when the band width D is 10 mm, the band width d is 2 to 7 mm, particularly 3 to 6 mm. Is normal.

<Usage and Usage> Packaging bag or package having the above structure (particularly pillow packaging bag or pillow package)
Is particularly suitable as a packaging bag or package for foods for heating or cooking foods containing water in a microwave oven. In this case, in addition to putting the food as it is into a package,
In many cases, foods are packaged in a tray to be packaged. In addition, not only foods but also other materials can be heated.

Taking the case where the package is a pillow package having a trunk gasket seal band (S ₁ ) as an example, when heating or cooking with a microwave oven, the trunk gasket seal band is used. The side with (S ₁ ) may be either the lower surface or the upper surface, but the fact that it can be the lower surface is also one of the features of the present invention. Especially when the contents are food with a tray, the surface opposite to the one with the trunk gasket seal band (S ₁ ) is the surface of the product, so heating or cooking by microwave oven is the product form It is advantageous to any of the three manufacturers, that is, the manufacturer, the store, and the consumer, that it can be performed in a street posture (a posture in which the side with the trunk gasket seal band (S ₁ ) is the lower surface).

<Operation> Next, the torso garment described above is used.
Band (S₁) And C-shaped edge seal band (S_Two) And
The operation is explained by taking the case of a pillow package as an example.
I do. Heat the pillow package with a microwave oven or
When subjected to cooking, the bag will swell,
Is the torso seal band (S₁) Near the center and the edge
Band (S _Two), (S_Two).
You. However, the edge seal band (S_Two) Torso seal
Obi (S₁), A C-shaped bay inside the bag
It has a curved shape and the edge seal band (S_Two)
d is the edge seal band (S_Two) Band width in other parts of)
Since it is smaller than D, C that protrudes inside the bag
The maximum stress is applied to the U-shaped curved part, and the part of the band width d is peeled off.
Release and break the bag. Trunk Gassho Seal Band (S₁With central part
Since the stress is also applied to the band, the band may peel slightly.
However, since the band width D is large, the band width of the C-shaped curved portion
The part of d will surely break the bag first.

The peel strength at the interface between the first layer (2a) and the second layer (2b) of the sealant layer (2) is a predetermined design that is large in normal state but small in high temperature. Since the value is set to a value, when the package is subjected to heating or cooking by a microwave oven, the necessary steaming effect can be exhibited, and at the same time, the internal pressure can be prevented from becoming excessively high.

[0036]

The present invention will be further described with reference to the following examples. In the figure, the seal band
(S ₁ ), the edge seal band (S ₂ )) are indicated by scattered points.

Example 1 FIG. 1 is a plan view showing an example of a packaging bag and a package according to the present invention. FIG. 2 is a bottom view of the packaging bag or package of FIG. FIG. 3 is an enlarged sectional view showing an example of a layer configuration of a laminated sheet constituting the packaging bag or package of FIG. FIG.
FIG. 2 is an explanatory diagram schematically showing an example of the packaging bag or package of FIG. 1. FIG. 5 is an explanatory view schematically showing a state at the time of bag breakage when heating or cooking with a microwave oven is performed.

By the inflation method, the following “first
Layer (2a) / Second layer (2b) "
m was formed into a sealant layer (2) consisting of a co-extruded two-layer film. 1st layer (2a): 0: 100, 3 by weight ratio of linear low density polyethylene (LLDPE) having a density of 0.920 and low density polyethylene (LDPE) having a density of 0.920 having a thickness of 10 μm.
Blend layer of 0:70, 50:50 or 70:30 (in this order, Cases 1, 2, 3, and 4) Second layer (2b): 30 μm thick propylene-based polymer layer

The thus obtained “first layer (2a) / second layer”
(2b) ", the second layer (2b)
A 15 μm-thick biaxially stretched nylon film (O-Ny) as an example of the base material sheet (1) was dry-laminated using a urethane-based adhesive so that the side was on the base material sheet (1) side. As a result, a laminated sheet having a layer structure of the base sheet (1) / the sealant layer (2) was obtained (see FIG. 3).

Using, as a sample, a heat-sealed sheet having a width of 15 mm with the sealant layer (2) side of the laminated sheet facing each other, a peel strength P ₂₅ at a temperature of ₂₅ ° C. and a peel strength P ₉₀ at a temperature of 90 ° C. were measured. did. Measurement is JIS Z0
238. That is, using an autograph manufactured by Shimadzu Corporation, in an oven, the sample was gripped by a chuck connected to the upper load cell and a chuck from below, and the internal temperature of the oven was raised to 25 ° C. for 3 hours. Or 9
After holding at 0 ° C. for 3 hours, the lower chuck was pulled downward at a speed of 300 mm / min.

Table 1 shows the measurement results. The numerical values of the peel strength in Table 1 are the average values of the number of tests n = 6.

[0042]

[Table 1]

From the above results, Case 3 was optimal for the first layer (2a).
For a), the blend formulation of Case 3 was adopted.

Using the formulation of Case 3 as the first layer (2a), the "base sheet (1) / sealant layer (2)", that is, "first layer (2a) / second layer (2b) / base" Material sheet (O-Ny) (1) ". Next, using this laminated sheet, a horizontal pillow packaging bag (package) having a size of 205 mm × 130 mm was prepared as shown in a plan view in FIG. 1 and a bottom view in FIG. This horizontal pillow packaging bag has a trunk-side palm-sealing seal band (S ₁ ) extending substantially along the center line of the trunk on one side of the bag toward both ends of the bag, and an edge seal band (S ₂ ) And (S ₂ ). In the horizontal pillow packaging, the contents (foods) with a tray are rolled up, heat-sealed at a predetermined pitch while being attached to the back (spreading on the trunk), and then cut at the center of the heat-sealing band. It was done by doing.

The shape of the edge seal band (S ₂ ) of the horizontal pillow packaging bag (package) is matched with the trunk-side palm-sealing seal band (S ₁ ) by devising the shape of the seal plate. It has a shape that curves in a C-shape toward the body of the bag at the site. C
The width d (the narrowest portion of the C-shape) of the edge seal band (S ₂ ) in the character-shaped portion is 5 mm, and the band width D in the other portions of the edge seal band (S ₂ ) is 10 mm. Set to. In addition, the band width of the torso sealing band (S ₁ ) was set to 15 mm.

The package thus obtained was subjected to a transportation test under conditions simulating distribution in a frozen state, but no breakage of the bag or abnormality of the contents was observed, and none of the seal bands was damaged. It was confirmed that.

When 20 or more randomly sampled samples out of the many packages obtained above were placed in a microwave oven and heated as they were, steam was generated with the elapse of heating time, and the internal pressure increased. The package begins to swell, but when it reaches a certain pressure, two edge seal bands
One of the (S ₂ ) and (S ₂ ) C-shaped curved portions peeled off at the curved portion to cause bag breakage, and the internal pressure was smoothly and automatically released. In this case, although the side of the inner line in the vicinity of the center portion of the body portion twofold tension seal strip (S ₁₎ there may be a slight peeling is observed, the sealing of the barrel twofold tension seal strip (S ₁₎ There was no situation that was harmed.

Thus, for a number of test samples,
One of the two edge seal bands (S ₂ ) and (S ₂ ) has a problem that the bag breaks only from the seal portion of the curved portion in one of the C-shaped portions, and the bag breaks from the other seal portion. In addition, no trouble occurred when the power of the microwave oven was variously changed.

Embodiment 2 FIG. 6 is an enlarged sectional view showing another example of the layer structure of the laminated sheet forming the packaging bag or package of the present invention.

By the inflation method, the following “first
A sealant layer (2) consisting of a coextruded three-layer film having a total thickness of 40 μm and having a layer structure of “layer (2a) / second layer (2b) / third layer (2c)” was formed. The first layer (2a): a 7: 7 m thick, 40:60 blended layer of linear low-density polyethylene with a density of 0.920 and low-density polyethylene with a density of 0.920 (in this order, Cases 1, 2, 3, and 4);・ The second layer (2b): a propylene polymer layer having a thickness of 26 μm ・ The third layer (2c): a linear low density polyethylene layer having a thickness of 7 μm and a density of 0.920

The thus obtained “first layer (2a) / second layer”
(2b) / third layer (2c) ”is an example of a base sheet (1) in which the third layer (2c) side is the base sheet (1) side. Was dry-laminated on one side of a biaxially stretched polyethylene terephthalate (PET) having a thickness of 12 μm using a urethane-based adhesive. Thus, a laminated sheet having a layer structure of the base sheet (1) / the sealant layer (2) was obtained.

Using a laminated sheet heat-sealed to a width of 15 mm with the sealant layer (2) side facing each other as a sample, a temperature of 25 ° C. was obtained in the same manner as in Example 1.
When the peel strength P _25, the peel strength was measured P ₉₀ at a temperature 90 ° C. in the peel strength P ₂₅ is 1.50 kg / 15 mm,
Peel strength P ₉₀ was 0.03 kg / 15 mm.

Using the above laminated sheet, a horizontal pillow packaging bag (package) was prepared in the same manner as in Example 1, and a test for one month under a condition simulating distribution and a microwave heating test were performed. As in the case of Example 1, no trouble occurred.

[0054]

According to the packaging bag or package of the present invention, in the laminated sheet having the layer structure of the base material sheet (1) / the sealant layer (2), the sealant layer (2) is located between the inner side of the bag and the sealant layer (2). A first layer (2a) and a second layer (2b) adjacent to the first layer (2a)
And the peel strength of the interface between the first layer (2a) and the second layer (2b) in the sealing portion when the packaging bag or the package is formed. When the peel strengths at 25 ° C. and 90 ° C. are P ₂₅ and P ₉₀ , respectively, P ₂₅ is 1.0 to _2.5 kg / 15 mm, P ₉₀
Is set to be 0.01 to 0.2 kg / 15 mm.

Therefore, the sealability is not impaired in the distribution process or the storage process, and when the package is subjected to heating or cooking by a microwave oven, the required steaming effect is exhibited as designed, It is possible to reliably prevent the internal pressure from becoming excessively high.

Further, the packaging bag or package of the present invention is a pillow package having a preferred embodiment of a body-sealed sealing band (S ₁ ) and a C-shaped curved edge sealing band (S ₂ ). In addition to the above-described effects, the C of the edge seal band (S ₂ )
There is also an advantage that heating or cooking by a microwave oven can be performed with the trunk gasket-sealing seal band (S ₁ ) down, since the bag is reliably broken from the portion curved in the shape of a letter.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a packaging bag and a package of the present invention.

FIG. 2 is a bottom view of the packaging bag or package of FIG.

FIG. 3 is an enlarged cross-sectional view showing an example of a layer configuration of a laminated sheet constituting the packaging bag or package of FIG.

FIG. 4 is an explanatory diagram schematically showing an example of the packaging bag or package of FIG. 1;

FIG. 5 is an explanatory view schematically showing a state at the time of bag breaking when heating or cooking by heating with a microwave oven is performed.

FIG. 6 is an enlarged sectional view showing another example of the layer structure of the laminated sheet forming the packaging bag or package of the present invention.

FIG. 7 is an explanatory diagram showing an example of a C-shaped seal band formed on a side seal band (S ₂ ).

[Explanation of symbols]

(1) ... substrate sheet, (2) ... sealant layer, (2a) ... first
Layer, (2b): Second layer, (2c): Third layer, (S ₁ ): Trunk gasoline sealing band, (S ₂ ): Edge sealing band

Claims (5)

[Claims] 1. A packaging bag made from a laminated sheet having a layer structure of a base material sheet (1) / a sealant layer (2) or a package in which contents are filled and packed therein, wherein said sealant layer (2) ) Comprises a multi-layer polyolefin resin layer including a first layer (2) on the inner surface side of the bag and a second layer (2b) adjacent to the first layer (2a); The first in the seal part when it is a bag or a package
The peel strength at the interface between the layer (2a) and the second layer (2b) depends on the temperature 2
When the peel strengths at 5 ° C. and 90 ° C. are P ₂₅ and P ₉₀ , respectively, P ₂₅ is 1.0 to _2.5 kg / 15 mm, P ₉₀
Is 0.01 to 0.2 kg / 15 mm, the packaging bag or package having an automatic pressure regulation function. 2. A packaging bag or package body comprising: a body-side palm-sealing seal band (S ₁ ) extending toward both ends of the bag along a substantially center line of the body on one side of the bag; and at least one of the both edges. edge seal strip for sealing the edges (S ₂₎ pillow packaging bags and a or packaging bag or package having an automatic pressure regulating function of claim 1 wherein the pillow packaging. 3. The shape of the edge seal band (S ₂ ) is curved into a C-shape toward the body of the bag at a position where the edge seal band (S ₂ ) is joined with the torso seal band (S ₁ ). The width d of the edge seal band (S ₂ ) in the C-shaped portion is smaller than the width D of the other portion of the edge seal band (S ₂ ). The packaging bag or the package having an automatic pressure adjusting function according to claim 2, which has an automatic pressure adjusting function. 4. A multilayer polyolefin-based sealant layer (2) comprising a first layer (2a) on the inner surface side of the bag and a second layer (2b) adjacent to the first layer (2a). The packaging bag or package having an automatic pressure regulation function according to claim 1, wherein the packaging bag or package is constituted by a co-extruded multilayer film composed of a resin layer. 5. A packaging bag or a package having an automatic pressure control function according to claim 1, which is a packaging bag or a package for packaging food with or without a tray for heating or cooking by a microwave oven.