JP2002284251A - Nonbursting package for heating by microwave oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a package for heating by microwave oven wherein a pressure release and air discharge do not accompany a pop sound or an explosion sound due to a positional relationship of a non-heat-sealed section as an air discharging means when the inside of the package has reached a specified internal pressure. SOLUTION: This package for heating by microwave oven has a branched section. In such a package for heating by microwave oven, the non-heat-sealed section for discharging gas is formed at least at one location in a manner to be opened to the external edge side of the branched section, at one section on the external edge side of the heat-sealed section of the branched section. Also, at an optional place of the 15 mm width including the non-heat-sealed section, the length (HO) from the internal edge of the heat-sealed section to the distal end of the non-heat-sealed section, and the maximum peeling strength (S) of a cut piece of the 15 mm width, of which the total surface is heat-sealed satisfies a relationship of HO>1×10<4> ×(21-36 O/S)<-4> for the package for heating by microwave oven preventing burst.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package in which cooked or semi-cooked food or the like is sealed, and more particularly, to a package which is pressurized with heating in a cooking device such as a microwave oven. The present invention relates to a package for heating a microwave oven which prevents bursts in which gas such as air inside the package is smoothly exhausted from a spot-shaped opening formed in the package together with a quiet opening sound.

[0002]

2. Description of the Related Art Conventionally, contents such as foods are packaged,
Japanese Patent Application Laid-Open No. 2000-18577 discloses a package for heating and cooking that can be cooked by a microwave oven and that can prevent the package from being ruptured due to an internal heating pressure.
No. 7 is known. In this package, the joint between the joints is formed as an easy-open seal, and one or more of the joints are provided with an easy-to-permeate means. When the internal pressure of the package increases due to heating, pressure can be released from the joint between the joints. It is configured as follows.

[0003] Japanese Patent Laid-Open No. 10-101154 discloses a similar packaging bag for heat treatment using a microwave oven. This package body is provided with a non-seal portion in a seal portion formed in a palm shape, and a swelling seal portion locally swelled toward the inside of the packaging bag corresponding to the non-seal portion,
When the internal pressure of the package increases due to heating, the pressure is released from the swelling seal portion through the non-seal portion.

Japanese Patent Application Laid-Open No. Hei 10-59433 discloses a similar packaging bag for heat treatment using a microwave oven. In this package, a thin film interposed seal portion is provided in a part of the heat seal portion so that the thin film interposed seal portion is smaller than the seal strength of the non-thin film interposed seal portion. Is formed in a narrow seal portion, and when the inside of the bag reaches a predetermined pressure, the pressure can be automatically released.

[0005]

However, the above-mentioned Japanese Unexamined Patent Application Publication No.
In the package disclosed in 000-185777, the sealability of the easy-open seal is not constant due to the sealing conditions. Since the positional relationship and the relationship of the shape and the like are not clear, there is a possibility that gas explosion or explosion may be accompanied even if pressure is released.

Further, in the packaging bag disclosed in Japanese Patent Application Laid-Open No. H10-101154, even if the pressure between the non-seal portion and the swelling seal portion as the easy-to-permeate means is not clear, pressure can be released. May cause gas plosives and explosions. Further, the peel strength of the seal portion is 150 g to 1200 g.
Because of the g / 15 mm width, this packaging bag is highly likely to be unexpectedly peeled off from the bulging seal portion by an impact at the time of dropping or the like.

Further, in the packaging bag disclosed in Japanese Patent Application Laid-Open No. 10-59433, since the entire thin film interposed seal portion is formed as a weak seal portion, the bag is broken by an impact at the time of dropping or the like. In addition to the danger, once the peeling starts, the peeling opening may be severely broken, resulting in a loud opening sound or the possibility of the contents being scattered.

The present invention solves the above-mentioned problem in the conventional microwave heating package by reducing the pressure loss when the package reaches a predetermined internal pressure in the positional relationship of the non-heat-sealing portion as the exhaust means. It is another object of the present invention to provide a package for heating a microwave oven, which does not cause explosion or explosion of exhaust gas. Further, it is another object of the present invention to provide a microwave heating package capable of performing a retort sterilization treatment. further,
An object of the present invention is to provide a microwave oven heating package having impact resistance against inadvertent peeling or bag breakage during distribution or dropping.

[0009]

To achieve the above object, a first aspect of the present invention is directed to a microwave oven heating package having a branch portion, wherein the non-heat-sealing portion for gas exhaust includes the branch portion. Part of the outer edge side of the heat seal part,
A length (H0) from an inner edge of the heat-sealed portion to a tip of the non-heat-sealed portion at an arbitrary place having a width of 15 mm including at least one non-heat-sealed portion and formed at at least one location to be open to the outer edge side of the branch portion; And the maximum peel strength (S) of a 15 mm wide heat-sealed section is given by the formula: H
0> 1 × 10 ⁴ × (21−360 / S) ⁻⁴ The structure of the package for heating a microwave oven in which burst satisfying the relationship of ⁻⁴ is prevented.

[0010] Further, the present invention is directed to a package for heating a microwave oven which prevents a burst in which the width (W0) of the non-heat-sealed portion at a point 1 mm from the tip of the non-heat-sealed portion for gas exhaust is less than 20 mm. .

Further, the present invention provides a package for heating a microwave oven which prevents a burst in which the seal width (W1) at the tip of the non-heat sealing portion for gas exhaust is 16 mm or less.

Further, at least a part of the non-heat-sealing portion for gas exhaust includes a central top portion on the outer edge side of the branch portion,
A package for heating a microwave oven that prevents a burst formed near or within a circle passing through three points, that is, a point passing through an inner edge side of a branch portion and an inner edge side of a heat seal portion of a pouch body, is provided.

According to a second aspect of the present invention, in a microwave oven heating package having a branch portion, at least a part of an inner edge side of the heat seal portion of the branch portion has a convex portion projecting toward the contents. In the convex portion forming portion, at least one non-heat-sealing portion for gas exhaust whose one end is open to the outer edge side of the heat seal portion and the other end is sealed in the convex portion direction is formed, 15mm including non-heat-sealed part
At an arbitrary position of the width, the width direction length (W
2) and at least one of the combinations of the length (H1) from the inner edge of the projection to the tip of the non-heat-sealed portion and the maximum peel strength (S) of the 15 mm-wide heat-sealed section,
Formula, H1> 1 × 10 ⁴ × (W2 + 6-360 / S) ⁻⁴
The structure of the package for heating a microwave oven in which the burst satisfying the above relationship is prevented.

Further, the present invention is directed to a package for heating a microwave oven which prevents a burst in which the width (W3) of the non-heat-sealed portion at a point 1 mm from the tip of the non-heat-sealed portion for gas exhaust is less than 20 mm. .

Further, there is provided a package for heating a microwave oven which prevents a burst in which the seal width (W4) at the tip of the non-heat sealing portion for gas exhaust is 16 mm or less.

According to a third aspect of the present invention, in a microwave oven heating package having a branch portion, a weak seal portion and a strong seal portion are adjacent to at least a part of the heat seal portion of the branch portion in parallel. A microwave heating package is formed, wherein a weak seal portion is continuous, and a strong seal portion is prevented from being discontinuous through a discontinuous portion for gas exhaustion.

[0017] Further, the seal strength of the weak seal portion is less than 15 N / 15 mm width at room temperature, and the seal strength of the strong seal portion is 15 N / 15 mm width or more at room temperature. In the configuration of the package.

Further, at an arbitrary location having a width of 15 mm including the discontinuous portion for exhausting gas, the length (W5) of the strong seal portion in the width direction and the length from the inner edge to the outer edge of the strong seal portion (W5) At least one of the combinations of H2) and the maximum peel strength (S) of the heat-sealed section having a width of 15 mm was determined by the formula: H2> 1 × 10 ⁴ × (W5 + 6-36)
0 / S) ^-4 , which prevents the burst satisfying the relationship of ^-4 .

Further, there is provided a package for heating a microwave oven which prevents a burst in which the discontinuous portion for gas exhaust is formed as a weak seal portion.

Further, there is provided a package for heating a microwave oven in which a discontinuous portion for gas exhaust is formed as a non-heat-sealed portion to prevent a burst.

Still further, in the structure of the microwave oven heating package according to the present invention, the burst portion having at least one branch chamber in which the branch portion is branched is prevented.

According to the present invention, the position and the shape of the non-heat-sealing portion, which is the exhaust means, are specified in the microwave heating package having the branch portion by the configuration of the present invention, so that it can be used in a cooking device such as a microwave oven. The gas inside the package body pressurized by the heating is smoothly exhausted with a quiet opening sound without explosive sound or explosive sound. In addition, by specifying the positional relationship of the non-heat-sealed portion, it is possible to obtain a microwave oven heating package having a branch portion excellent in impact resistance and retort sterilization treatment.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 5 show an example of the first invention of the present application. A heating package 1 formed by heat-sealing four sides of a rectangular shape has a front surface or a back surface of the heating package 1. Has a branch portion 2. A part of the heat seal portion 4 on the long side of the branch portion 2 includes a non-heat seal portion 3.
Are formed in at least one place.

[0024] In the retort sterilizing bag, the seal strength of the heat seal portion is required to be 23 N / 15 mm width or more (JIS Z 0238). This requirement is 15 mm at any place including the non-heat-sealed part.
When a piece of width is cut out, the length (H0) from the inner edge of the heat seal portion to the tip of the non-heat seal portion shown in FIG.
And the maximum peel strength (S) of the 15 mm wide heat-sealed section is given by the formula: H0> 1 × 10 ⁴ × (21-360 /
S) It can be achieved by forming the non-heat-sealed portion 3 so as to satisfy the relationship of ^-4 . By satisfying this relational expression, it is possible to provide a microwave oven heating package excellent in impact resistance and sealing reliability.

The relationship between the length (H0) from the inner edge of the heat-sealed portion to the tip of the non-heat-sealed portion and the maximum peel strength (S) of a 15 mm-wide heat-sealed section is as follows:
It is derived as a result of repeated experiments by the present inventors, and what satisfies this relational expression is that the sealing strength of the heat seal portion is 23 N / 15 mm width corresponding to the retort as is clear from FIG. If the above relation is not satisfied, the seal strength of 23 N / 15 mm width or more cannot be achieved.

It should be noted that the relationship between H0 and S will be supplemented with reference to FIG. 3. If the width of the heat-sealing portion including the non-heat-sealing portion 3 is arbitrarily set to 15 mm, the shape of the heat-sealing portion is as shown in FIG. As shown in FIG.
It can be considered as a rectangle consisting of the vertical H0. When the length from the inner edge of the rectangular heat seal portion to the tip of the non-heat seal portion is H0, the relational expression H0> 1 ×
What is necessary is just to form so as to satisfy 10 ⁴ × (21−360 / S) ⁻⁴ .

The relational expression H0> 1 × 10 ⁴ × (21-3
60 / S) ^-4 is a heat-sealed portion not including a non-heat-sealed portion as shown in FIG.
It must also be satisfied with a rectangle consisting of zero (maximum peel strength S).

The heating package of the present invention has a width (W) of the non-heat-sealed portion at a point (L) 1 mm from the lowest point of the non-heat-sealed portion 3 from the viewpoint of suppressing the opening sound at the time of gas discharge.
0) is preferably formed to be less than 20 mm.
As shown in FIG. 4, the width of W0 as defined in the present invention means that a line parallel to the inner edge line of the side seal portion is drawn from the lowest point of the non-heat seal portion 3, and the non-heat seal portion is drawn from the parallel line. The width of the non-heat-sealed portion 3 when a line is drawn in parallel with the parallel line at a point (L) of 1 mm inward of the portion 3, meaning that this width is formed to be less than 20 mm. I have.

The seal width (W) at the tip of the non-heat-sealed portion 3
It is preferable that 1) be at most about 16 mm. As shown in FIG. 4, the width of W1 defined in the present invention refers to the width of the non-heat-sealed portion 3 when a parallel line with the inner edge of the side-sealed portion is drawn from the lowest point of the non-heat-sealed portion 3. , Which means that the width is formed to be at most about 16 mm. This is because if the thickness is more than 16 mm, the peeling of the heat seal portion does not concentrate on the tip end portion, which may lead to rupture of the entire package.

Further, in the heating package according to the present invention, as shown in FIG. 5, at least a part of the non-heat-sealed portion 3 is formed such that the outer edge side central top X of the branch portion and the inner edge side of the branch portion. It is preferable to be formed close to or within the circumference of a circle passing through three points Y and Z where the point and the inner side of the heat seal portion of the packaging body intersect. This rule stipulates that, even when two or more non-heat-sealed portions are formed, at least one portion of the non-heat-sealed portion 3 is close to a circle or included in the circumference. Means

The case where the branching portion is provided at the center of the package body will be described with respect to the above configuration. First, the pressure in the package inside which is increased by heating the microwave oven is, first, the portion closest to the center of the package body, that is, In order to concentrate near the center of the heat seal portion 4 at the branch portion, it is important that an opening where the heat seal portion 4 and the non-heat seal portion 3 communicate with each other first is formed in this portion. According to experiments by the present inventors, if at least a part of the non-heat-sealed portion 3 is formed within the range of a circle connecting three points of X, Y, and Z, opening by heating will cause a popping sound or It was confirmed that the explosion was performed without explosion.

FIGS. 6 to 8 show an example of the second invention of the present application, in which a part of the heat seal portion 4 of the branch portion has a convex portion 8 projecting toward the content storage portion side. A non-seat seal portion 3 is formed corresponding to the convex portion, which is narrower than the width of the convex portion, is open to the outer edge side of the heat seal portion 4, and has a tip located in the convex portion. The size and length of the protruding protrusion are not particularly limited, but may be any as long as the pressure concentrates on the protrusion when the pressure inside the package increases.

Shortly after the pressure due to the internal pressure is concentrated and the protruding portion 8 starts to coagulate and separate, the gas flows into the non-heat-sealing portion 3 formed on the heat sealing portion 4 corresponding to the protruding portion 8.
To be released to the outside. The non-heat-sealed portion 3 is formed with one end opened to the outer edge side of the heat-sealed portion 4 and the other end sealed in the direction of the convex portion 8. The tip of the non-heat-sealed portion 3 in the direction of the convex portion 8 may enter the convex portion 8.

Further, in the present configuration, the heat sealing portion
The requirement that the seal strength of No. 4 be 23 N / 15 mm width or more is based on the length (W2) of the protrusion in the width direction shown in FIG.
And the length from the inner edge of the protrusion to the tip of the non-heat-sealed portion (H
1) and at least one of the combinations of the maximum peel strengths (S) of the sections heat-sealed with a width of 15 mm,
Formula, H1> 1 × 10 ⁴ × (W2 + 6-360 / S) ⁻⁴
Can be achieved by forming the convex portion 8 and the non-heat-sealed portion 3 so as to satisfy the following relationship. By satisfying this relational expression, it is possible to provide a microwave oven heating package excellent in impact resistance and sealing reliability.

Note that W2, H1 and S in FIG.
Complementing the relationship, the shape of the heat-sealed portion including the heat-sealed portion 4 including the non-heat-sealed portion 3 and the convex portion 8 is W2 · H1 as shown in FIGS. 7B and 7C. It can be thought of as a rectangle. Then, W2, H1, and S of this rectangle are represented by the relational expression, H1> 1.
That is, it is only necessary to be formed so as to satisfy × 10 ⁴ × (W2 + 6-360 / S) ^-4 .

The non-heat-sealed portion 3 does not necessarily mean that the inner layers are not heat-sealed with each other, and may have a configuration in which the inner and outer layers of the relevant portion are missing.

The shapes of the convex portion 8 and the non-heat-sealed portion 3 are each arbitrarily formed. For example, as shown in FIG. 8, the shape of the convex portion is tapered at the tip and the non-heat-sealed portion is trapezoidal. Any shape can be adopted.
In addition, according to the present invention, as shown in FIG. 8, the non-heat-sealing portion 3 formed by a line parallel to the inner edge side of the branch portion, passing above the lowermost point of the non-heat-sealing portion by 1 mm (L).
If the width (W3) is less than 20 mm, any shape can be selected. The lower limit of W3 may be as small as possible as long as it has a function as a non-heat-sealing portion for gas exhaustion, but is about 4 mm. If it is 20 mm or more, the opening at the time of gas discharge does not become a spot-shaped one previously formed as the non-heat-sealing part 3, and even if the pressure can be released, a quiet opening sound accompanied by a bursting sound and explosion sound of the gas. And the exhaust cannot be done smoothly.

The seal width (W) at the tip of the non-heat-sealed portion 3
4) is preferably about 16 mm at the maximum.
This is because if the thickness is more than 16 mm, the peeling of the heat seal portion does not concentrate on the tip end portion, which may lead to rupture of the entire package.

FIGS. 9 to 12 show an example of the third invention of the present application. At least a part of the heat seal portion of the branch portion 2 includes a continuous weak seal portion 9 and a discontinuous strong seal portion 10. Are characterized in that they are adjacent in parallel. Hereinafter, the heat seal area where the weak seal part and the strong seal part are formed in parallel may be referred to as an “open area”.

At least a part of the branch portion is provided with a weak seal portion 9 which can be peeled off by the pressure in the package increased by heating.
And an unsealing area formed of a strong seal portion 10 formed in a discontinuous state and juxtaposed adjacent thereto.
In the configuration of the opening area, a strong seal portion 10 is formed along the outer edge side or the inner edge side of the branch portion, and a weak seal portion 9 is formed adjacent thereto along the outer edge side or the inner edge side of the branch portion. .

Therefore, when the strong seal portion 10 is formed on the outer edge side of the branch portion, the weak seal portion 9 is formed adjacent to the strong seal portion 10 on the inner edge side of the branch portion. The arrangement of the strong seal portions 10 may be such that the outer edge side of the branch portion is a weak seal portion and the inner edge side is a strong seal portion. What is important in the configuration of the unsealing area is that the strong seal portion 10 is discontinuous and the weak seal portion 9 is formed continuously. This discontinuous part 11
The gas in the package is discharged to the outside through the package.

That is, the internal pressure increased when the package is heated is limited by the size of the opening at the discontinuous portion 11 of the strong seal portion 10, the weak seal portion 9 adjacent thereto is separated, and gas is released. It is discharged to the outside. A strong seal means that the seal strength at room temperature is 15 N / 15 mm width or more, and a weak seal means that the seal strength at room temperature is less than 15 N / 15 mm width. If the sealing strength of the strong sealing portion is less than this value, the size of the opening cannot be regulated by the width of the non-heat sealing portion, so that it does not become a spot-like one, and the gas discharge accompanying heating cooking is smoothly performed.
Moreover, it cannot be performed without making an unpleasant gas opening sound.

The location where the opening area is formed may be any location as long as it is at least one location of the branch portion, and the other heat seal portions are formed as strong seal portions. The discontinuous portion 11 of the strong seal portion 10 may be formed as a weak seal portion or may be formed as a non-heat seal portion. When the discontinuous portion 11 is formed as a weakly sealed portion, the overall sealing strength is higher than that when the portion is formed as a non-heat-sealed portion, and is particularly suitable as a retort-compatible package. Further, as the non-heat-sealed portion, the portion may be unsealed or may be cut out.

The structure of the strong seal portion 10 can be formed into any shape as long as it is discontinuous.
However, the present invention is not limited to these, and it is only necessary that the discontinuous portion 11 of the strong seal portion 10 exists between the base portions.

The shortest distance between the strong seal portions is as follows:
Although not particularly limited, the upper limit is preferably 16 mm or less for the purpose of the present invention of discharging gas in the package under a quiet opening sound without explosion or explosion. .

The sealing strength of the strong seal is 15 N / 15
If the width is equal to or more than the width, the object can be achieved. However, if the width satisfies the retort requirement of 23 N / 15 mm or more, as shown in FIG.
At least one of the combination of the width (W5) of the strong seal portion in the width direction, the length (H2) from the inner edge to the outer edge of the strong seal portion, and the maximum peel strength (S) of the 15-mm-wide strongly heat-sealed section is satisfied. , Formula, H2> 1 × 10 ⁴ × (W5 +
6-360 / ^S) can be achieved by satisfying ^-4 relationship. By satisfying this relational expression, it is possible to provide a microwave oven heating package excellent in impact resistance and sealing reliability.

The relationship between W5, H2 and S is supplemented by using the configuration shown in FIG. 11A. If the width of 15 mm including the discontinuous portion 11 of the strong seal portion is arbitrarily taken, The shape of the heat seal part is 10mm (W5)
It becomes a rectangle of × 5 mm (H2). From this rectangle, the relational expression, H2> 1 × 10 ⁴ × (W5 + 6-360 /
S) What is necessary is just to form so as to satisfy ^-4 .

Note that this relational expression, H2> 1 × 10 ⁴ ×
(W5 + 6-360 / S) ^-4 is shown in FIG.
When the strong seal portion as shown in (c) is divided by a discontinuous portion, the length (W5) of the strong seal portion in the width direction is defined as the sum of the lengths of the strong seal portion in the width direction (W5 = Wα + Wβ). Can be applied. From this, all of the configurations shown in FIG. 11 are 10 mm (W5) × 5 mm (H2), and satisfy the relational expression when the maximum peel strength S is 50 N / 15 mm.

The length in the width direction of the strong seal portion (W5)
The relationship between the length (H2) from the inner edge to the outer edge of the strong seal portion and the maximum peel strength (S) of the 15 mm-wide heat-sealed section was derived as a result of repeated experiments by the present inventors. What satisfies this relational expression, as is clear from FIG. 12 (b), is that the seal strength of the heat seal portion achieves a retort-compatible width of 23 N / 15 mm or more. If not satisfied, a seal strength of 23 N / 15 mm width or more cannot be achieved.

The branch portion may be as shown in FIG. 9B, but it is effective to form at least one branch chamber as shown in FIG. 9A for the package of the present invention. That is, by providing the branch chamber, it is possible to prevent inadvertent peeling or bag breakage due to local stress concentration due to an external impact during distribution and handling of the package. Further, by bending the branch portion having the branch chamber along the pouch main body, it is possible to reduce the impact force applied to the branch portion from the pouch main body.

The material constituting the package of the present invention is such that polyethylene, polypropylene or propylene and an α-olefin other than propylene such as ethylene, butene-1, hexene-1 and octene-1 are used as the inner layer serving as the sealing surface. And a thermoplastic resin having heat sealing properties, such as polyester and nylon.

Further, as the outer layer laminated with these,
For example, polyolefins such as biaxially stretched polypropylene, ethylene-vinyl acetate copolymer (EVA), EVA saponified product, ion-crosslinked olefin copolymer (ionomer): aromatic vinyl copolymers such as polystyrene and styrene-butadiene copolymer Polymer: vinyl halide polymer such as polyvinyl chloride, vinylidene chloride resin, etc .: Nitrile polymer such as polyacrylic resin, acrylonitrile-styrene copolymer, acrylonitrile-styrene-butadiene copolymer: biaxially stretched polyethylene terephthalate, Polyesters such as polytetramethylene terephthalate: various polycarbonates: polyacetals such as polyoxymethylene: thermoplastic resins such as aliphatic, aromatic polyamides and polyimides can be used alone or by laminating two or more kinds. . Also, for the purpose of imparting gas barrier properties,
A non-metal deposited film, flaky material, or oxygen-absorbing material may be used. The laminated film may have not only a structure of two layers but also a structure of three or more layers in terms of oxygen barrier properties.

Further, in the package of the present invention, the material constituting the strong seal portion is such that polypropylene or propylene, ethylene, butene-
Copolymers with α-olefins other than propylene, such as 1, hexene-1, and octene-1, and thermoplastic resins having heat sealing properties, such as polyester and nylon, are used.

As the weak seal portion, the inner layer of one seal surface may be the same as the material forming the strong seal portion, and the type of the polymer forming the other film inner layer may be appropriately changed. Seal strength 15N / 15m at room temperature
What is necessary is just to adopt suitably so that it may become less than m width.

The outer layer laminated with these inner layers may be the same as described above.

The total thickness of the laminated film is appropriately determined depending on the type and size of the package, but is not limited to polyethylene terephthalate (12 μm) / nylon (15 μm).
m) / polypropylene (70 μm) was used, and a bag made by heat-sealing the laminated films together on the polypropylene side was used.

The production method of this laminated film is not particularly limited, and means for laminating with an adhesive between an inner layer and an outer layer, laminating means by thermal lamination,
Any means such as a bonding means by coextrusion can be employed.

The form of the package of the present invention may be a bag such as a four-sided or three-sided sealed pouch, a standing pouch, or the like.
Alternatively, the configuration of the present invention can be employed for sealing with a sealing material such as a cup or a tray.

The structure of the package of the present invention described above can be applied to any package which is heated and cooked in a microwave oven or the like, but the seal strength is max 23 N / 15 mm.
In a retort pouch that is required to be not less than the width, it is possible to more effectively achieve the object of the present invention of smoothly discharging the gas in the pouch without a plosive sound or an explosion sound.

[0060]

The present invention will be described below based on examples and comparative examples. The examples and the like are for describing preferred embodiments of the present invention, and the present invention is not limited thereto.

Example 1 A laminate of 12 μm polyethylene terephthalate / 15 μm nylon / 70 μm polypropylene (PP) was heat-sealed with the PP layers as inner surfaces, and 100 mm × 15 mm as shown in FIG.
A heat-seal portion peel strength test piece having a width of mm was prepared. In the test piece, when the length in the width direction is (W) and the length in the vertical direction is (H), the heat seal portion forms a rectangular heat seal portion of W × H, and has a peel strength. Was measured. The results when W was 15, 13, 11, 9, 7 and 5 mm and H was 10, 7, 5, 3 and 1 mm are shown in Table 1 for maximum peel strength S: 50 N and 30 N / 15 mm width, respectively.

[0062]

[Table 1]

Similarly, W, H, and S were further subdivided, and from the obtained results, a relational expression satisfying a peel strength of 23 N, H> 1
× 10 ⁴ × (W + 6-360 / S) ^-4 was derived (FIG. 12). W: The relational expression when the width is 15 mm (constant) is H> 1 × 104 × (21-360 / S) −4, and the relational diagram is shown in FIG.

(First Invention) <Example 2> 12 μm polyethylene terephthalate / 1
A laminate of 5 μm nylon / 70 μm polypropylene (PP) is heat-sealed with the PP layers as inner surfaces (heat-sealing width 10 mm, maximum peel strength S: 50 N / 15 mm).
Width), with a branch of 10 mm height, 130 m
An mx 170 mm branch pouch was prepared. A semicircle + rectangular non-heat seal portion 3 shown in FIG. 1 is provided near the center of the outer edge side of the branch portion, and the length H0 between the tip of the non-heat seal portion and the inner edge side of the heat seal portion is 0.5, 1 2,4
mm (H0> 1 × 10 ⁴ × (21-360 / S) ⁻⁴ )
As a package for heating a microwave oven. Table 2 shows the relationship between the length H0 and the dimension of the non-heat-sealed portion.

[0065]

[Table 2]

The package was filled with 180 g of curry and sealed to obtain a package for heating a microwave oven. The package is
C. for 30 minutes under a pressurized steam retort, and furthermore, a peel test of a heat-sealed part (Tensilon (ORIENTEC)
Peeling speed 300 mm / mi by UCT-5T
n, room temperature 23 ° C, humidity 45%), drop test (height 1.2)
m, 10 times) and a microwave heating test, and the results are shown in Table 3.

[0067]

[Table 3]

As a result, there was no bag breakage due to the retort treatment and the drop test, and in the microwave oven heating, all the non-heat-sealed portions 3 were opened with small holes, and the contents could be heated without scattering.

<Comparative Example 1> The length H0 between the tip of the non-heat-sealed portion and the inner edge of the heat-sealed portion was set to 0.2 mm (H0
<1 × 10 ⁴ × (21-360 / S) ⁻⁴ ), except that it was the same as the microwave oven package (the non-heat-sealed portion 3 had a rectangular height of 6.8 mm) used in Example 1. Was used. When the package was subjected to a pressurized steam retort treatment at 120 ° C. for 30 minutes, the bag was broken during the retort treatment.

Example 3 12 μm polyethylene tereph
Tarate / 15μm nylon / 70μm polypropylene
(PP) is heat-sealed with the PP layers as inner surfaces.
(Heat seal width 10 mm, maximum peel strength S: 50
N / 15mm width) and has a branch part with a height of 10mm
A branch pouch measuring 130 mm × 170 mm was manufactured.
A non-heat-sealed portion 3 is provided near the center of the outer edge of the branch portion.
Length H0: 2 mm (H0> 1 × 10 ⁴× (21-360
/ S)^-4) And the non-heat seal shown in FIG.
The width W0 of the tapered part is changed to 2, 5, 10 and 15 mm
I let you. The package is filled with 180 g of curry, sealed, and
This was used as a package for heating a microwave oven. The package is kept at 120 ° C, 3
Perform 0 minute pressurized steam retort treatment and heat seal
Test (Tensilon (made by ORIENTEC, model no.
UC-5T), peeling speed 300 mm / min, room temperature 23
℃, humidity 45%) and microwave oven (commercially available, 500
W) A heating test was performed, and the results are shown in Table 4.

[0071]

[Table 4]

As a result, a small hole was opened in the non-heat-sealed portion 3 under any conditions, the opening sound was small, and the heating was possible without scattering of the contents.

<Comparative Example 3> The same package (H0: 2 mm) as used in Example 3 was used except that the width W0 of the non-heat-sealed portion shown in FIG. 4 was changed to 20 mm and 25 mm. And a heating test using a microwave oven. Table 5 shows the results.

[0074]

[Table 5]

As a result, the opening sound was loud under any of the conditions. In particular, in the case of the package having W0 of 25 mm, the contents were found to be scattered when opened by the microwave oven.

<Embodiment 4> The seal width W1 at the tip of the non-heat-sealed portion shown in FIG.
A microwave oven was performed using the same package (H0: 2 mm) as used in Example 3 except that the thickness was changed to 16 mm and 16 mm. The results are shown in Table 6.

[0077]

[Table 6]

As a result, in all the packages, the opening sound was quiet, and the contents could be heated without scattering.

<Comparative Example 4> The same package as that used in Example 4 (H0: 2 mm) was heated in a microwave oven except that the seal width W1 at the tip of the non-heat-sealed portion was set to 20 mm. As a result, in a package having W1 of 20 mm,
Upon heating in a microwave oven, the opening sound was loud and the contents were scattered.

<Example 5> A laminate of 12 μm polyethylene terephthalate / 15 μm nylon / 70 μm polypropylene (PP) was heat-sealed with the PP layers as inner surfaces (heat-sealing width 10 mm, maximum peel strength S: 50).
N / 15 mm width) to produce a branch pouch of 130 mm × 170 mm having a branch portion with a height of 10 mm.
85m from the short side of the heat seal part on the outer edge of this branch
A non-heat-sealing portion 3 (H0: 5 mm), which is a combination of a semicircle having a diameter of 8 mm and a rectangle having a length of 1 mm and a width of 8 mm, is provided at m (center of the branch portion), 60 mm, and 30 mm, respectively. And The package was filled with 180 g of curry and sealed to obtain a package for heating a microwave oven. The package was subjected to a pressurized steam retort treatment at 120 ° C. for 30 minutes, and a microwave oven heating test was performed. Table 7 shows the results
It was shown to.

[0081]

[Table 7]

As a result, in all the packages, there was no bag breakage due to the retort treatment, and the opening sound was small and the contents were not scattered by heating in the microwave oven.

Comparative Example 5 A non-heat-sealed portion was provided at a position 20 mm from the short side of the heat-sealed portion.
A package for heating a microwave oven was obtained in the same manner as in Example 5.
In the same manner as in Example 5, filling and sealing were performed, and a retort treatment and a microwave heating test were performed. As a result, the bag was not broken during the retort treatment, but in the microwave heating test, the bag was explosively opened from the center of the branch portion, and the contents were scattered.

(Second Invention) <Example 6> 12 μm polyethylene terephthalate / 1
A laminate of 5 μm nylon / 70 μm polypropylene (PP) is heat-sealed with the PP layers as inner surfaces (heat-sealing width 10 mm, maximum peel strength S: 50 N / 15 mm).
Width), with a branch of 10 mm height, 130 m
An mx 170 mm branch pouch was prepared. A protrusion 8 is provided on the content side of the branch shown in FIG. 7, and the distance between the lowest point of the protrusion 8 and the lowest point of the non-heat-sealed portion shown in FIG. H1 is 5)
And the non-heat-sealed portion 3 was provided up to a position of 7 mm to obtain a package for heating a microwave oven. The convex shape has a convex height of 7
mm, the width of the protrusion is 20 mm, and the shape of the protrusion is rectangular. The non-heat-sealed portion 3 has a shape obtained by combining a semicircle with a tip diameter of 4 mm and a rectangle. The packaging bag was filled with water and curry and sealed to obtain a packaging bag for microwave heating. The packaging bag was subjected to a pressurized steam retort treatment at 120 ° C. for 30 minutes, and further subjected to a peeling test of the heat-sealed portion 4 (tensilon (manufactured by ORIENTEC, model number UCT-5T) at a peeling speed of 300 mm / min, at room temperature of 23 ° C. and humidity of 45) %)
And a microwave oven heating test. The results are shown in Table 8.

[0085]

[Table 8]

The shape of H1 of 7 mm is determined by referring to FIG. 7 (c) in consideration of the rectangular heat-sealed portion of W2-H1, W2 = 8 mm, H1 = 7, and H1 is 5 mm.
Is W2 = 8 mm and H1 = 5 mm. When this result is applied to the graph of FIG. 12A, H1 is 5 mm.
And the shape of 7 mm is a relational expression, H1> 1 × 10 ⁴ × (W
2 + 6-360 / S) ^-4 . From these test results, all shapes have good openability in the microwave oven test, and the maximum seal strength satisfies the width of 23 N / 15 mm or more, so that a retort-compatible package excellent in impact resistance is obtained.

Comparative Example 6 A microwave oven was heated in the same manner as in Example 6 except that the tip of the non-heat-sealed portion 3 was disposed at a position 3 mm from the inner edge near the center of the branch portion without providing the convex portion 8. A package was prepared. In the same manner as in Example 6, filling and sealing were performed, and a retort treatment, a peel test of the heat-sealed portion 4, and a microwave heating test were performed. Table 9 shows the evaluation results.

[0088]

[Table 9]

It was confirmed that the packaging bag having no projection formed a popping sound when heated in a microwave oven.

<Comparative Example 7> The convex portion width was 10 mm and H1 was 7
The same test as in Example 6 was performed, except that mm was used. The result was no burst, and the opening sound was small, but did not satisfy the relational expression of WHS (W2 = 3 mm, H1 = 7 mm, S = 50).
N / 15mm width), the maximum seal strength is 23N / 1
It was recognized that it was not feasible as a retort food package with a width of less than 5 mm.

(Third Invention) <Example 7> 12 μm polyethylene terephthalate / 1
A laminate of 5 μm nylon / 70 μm polypropylene (PP) is heat-sealed with the PP layers as inner surfaces (heat-sealing width 10 mm, maximum peel strength S: 50 N / 15 mm).
Width), with a branch of 10 mm height, 130 m
An mx 170 mm branch pouch was prepared. A strip-shaped (130 mm × 5 mm) easy-opening film (Toray 9501A, thickness 50 μm) is inserted into the content portion of the branch portion, heat-sealed, and the weak seal portion 9, the strong seal portion 10, and the discontinuous portion are formed. No. 11 was provided as a non-heat-sealed part to obtain a packaging bag for heating a microwave oven. The shape of the strong seal portion 10 and the shape of the non-heat-sealed portion have the shapes shown in FIG. 9A (rectangular shape of strong seal portion 10 mm × 5 mm: square of non-heat-sealed portion 5 mm × 5 mm). The packaging bag was filled with water and curry and sealed to obtain a packaging bag for microwave heating. The packaging bag was subjected to a pressurized steam retort treatment at 120 ° C. for 30 minutes, and a peeling test in an opening area [peeling speed (trade name: UCT-5T, manufactured by ORIENTEC, model number UCT-5T): 300 mm / min, room temperature 23 ° C., humidity 45
%] And a microwave heating test. Table 10 shows the evaluation results.

[0092]

[Table 10]

<Comparative Example 8> The strong seal portion is continuous, that is,
A packaging bag for heating a microwave oven was prepared in the same manner as in Example 7 except that no discontinuous portion was provided. Using this bag,
In the same manner as in Example 7, filling and sealing were performed, and a retort treatment, a peeling test of an opened area, and a microwave heating test were performed. Table 11 shows the evaluation results.

[0094]

[Table 11]

It was confirmed that a packaging bag which did not form a discontinuous portion serving as an opening mouth produced a popping sound when the microwave oven was heated.

Example 8 A packaging bag for heating a microwave oven was prepared in the same manner as in Example 7 except that the shape of the strong seal portion 10 and the shape of the non-heat-sealed portion as a discontinuous portion were respectively as shown in Table 12. Produced. In the same manner as in Example 7, filling and sealing, retort treatment, peeling test of the opened area,
A microwave heating test was performed. Table 12 shows the evaluation results.

[0097]

[Table 12]

From the results, it was confirmed that the opening could be regulated by the width of the discontinuous portion of the strong seal portion if the seal strength of the strong seal portion as the opening area was 15 N / 15 mm width or more at room temperature.

<Embodiment 9> A discontinuous portion is weakly sealed.
That is, a packaging bag for heating a microwave oven was produced in the same manner as in Example 7, except that the strong seal portion was discontinuous via the weak seal portion. Using this, the same as in Example 7,
Sealing, retort treatment, peeling test of the opened area, and microwave heating test were performed. Table 13 shows the evaluation results.

[0100]

[Table 13]

From the results, it was confirmed that even if the discontinuous portion serving as the opening is formed as a weak seal portion, the opening is smoothly performed for discharging the gas.

<Example 10> A package for heating a microwave oven was manufactured in the same manner as in Example 7, except that the discontinuous portion was replaced with a defective portion. Using this, in the same manner as in Example 7,
Sealing, retort treatment, peeling test of the opened area, and microwave heating test were performed. Table 14 shows the evaluation results.

[0103]

[Table 14]

As a result, it was confirmed that even if the discontinuous portion serving as the opening was formed as a defective portion, the opening was smoothly performed for discharging the gas.

Example 11 A laminate of 12 μm polyethylene terephthalate / 15 μm nylon / 70 μm polypropylene was cut into a size of 100 mm × 15 mm width, and a strong seal portion and a non-heat seal portion (discontinuous portion) within a width of 10 × 15 mm. Was formed, heat sealing was performed on the inner surfaces of the PP layers to prepare a test piece shown in FIG. In this test piece, when the horizontal length of the strong seal portion shown in FIG. 13 is (W) and the vertical length of the strong seal portion is (H), a rectangular heat seal portion of W × H is shown. Was prepared, and the peel strength was measured. W is 10, 7.5 and 5
mm, H is 5 mm, the result is the maximum peel strength S: 50
Table 15 shows the N / 15 mm width. Strong seal part
A test piece of the discontinuous part-strong seal part was prepared in the same manner, and the measurement results are shown in Table 15.

[0106]

[Table 15]

Similarly, W, H, and S are further subdivided, and from the obtained results, a relational expression that satisfies a peel strength of 23 N or more:
H> 1 × 10 ⁴ × (W + 6-360 / S) ^-4 was derived.

[0108]

As described above, according to the package for heating a microwave oven having a branch portion according to the present invention, the gas inside the package which is pressurized by heating in a cooking device such as a microwave oven can be used.
It has the effect of being smoothly exhausted with a quiet opening sound without plosives or explosions. Further, there is an effect that a package for heating a microwave oven having excellent impact resistance and retort sterilization property can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of an example of a package for heating a microwave oven according to the first invention of the present application.

FIG. 2 is a graph for explaining the regulation of heat seal strength in the package for heating a microwave oven of the present invention.

FIG. 3 is an explanatory view showing locations of test pieces that define the sealing strength of the package for heating a microwave oven of the present invention.

FIG. 4 is a partially enlarged view for explaining the definition of the tip shape of the non-heat-sealed portion in the package for heating a microwave oven of the present invention.

FIG. 5 is an explanatory view showing a preferred positional relationship of a non-heat-sealed portion in the package for heating a microwave oven of the present invention.

FIG. 6 is a perspective view of an example of a package for heating a microwave oven according to the second invention of the present application.

FIG. 7 is a reference diagram for explaining a relational expression of a length (W2) of the protrusion in the width direction and a length (H1) from the inner edge of the protrusion to the tip of the non-heat-sealed portion according to the present invention.

FIG. 8 is a partially enlarged view for explaining a tip shape and a convex portion of the non-heat-sealed portion of the invention.

FIG. 9 is a perspective view of an example of a package for heating a microwave oven according to the third invention of the present application.

FIG. 10 is a partial schematic view showing an example of a shape of a strong seal portion of the heat seal portion of the invention.

FIG. 11 is a reference drawing of a test piece for defining heat seal strength in a strong seal portion of the heat seal portion of the invention.

FIG. 12 is a graph for explaining the regulation of the heat seal strength in the package for heating a microwave oven of the present invention.

FIG. 13 is a schematic view of a test piece for measuring a heat-sealed portion in the package for heating a microwave oven according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Package 2 Branch part 3 Non-heat seal part 4 Heat seal part 5 Outer edge side 6 Inner edge side 7 Branch room 8 Convex part 9 Weak seal part 10 Strong seal part 11 Discontinuous part

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Tsunehisa Namiki 22-4 Okazawacho, Hodogaya-ku, Yokohama-shi, Kanagawa Prefecture Inside the Toyo Seikan Group Research Institute

Claims (13)

[Claims] 1. A package for heating a microwave oven having a branch portion, wherein a non-heat-sealing portion for gas exhaust is open to a part of an outer edge side of the heat seal portion of the branch portion and to an outer edge side of the branch portion. The length (H0) from the inner edge of the heat-sealed portion to the tip of the non-heat-sealed portion was heat-sealed at an arbitrary location having a width of 15 mm including at least one non-heat-sealed portion. The maximum peel strength (S) of the section is expressed by the formula: H0> 1 × 10 ⁴
× (21-360 / S) ^-4 . A package for heating a microwave oven, wherein burst is prevented, which satisfies the relationship of ^-4 . 2. The width (W) of the non-heat-sealed portion at a point 1 mm from the tip of the non-heat-sealed portion for gas exhaustion.
The package according to claim 1, wherein 0) is less than 20 mm. 3. The package according to claim 1, wherein a seal width (W1) at a tip of the non-heat-sealing portion for gas exhaust is 16 mm or less. 4. At least a part of the non-heat-sealing portion for gas exhaust is formed at three points: a central top on the outer edge side of the branch portion, and a point where the inner edge side of the branch portion and the inner edge side of the heat seal portion of the pouch body intersect. The package for heating a microwave oven in which a burst is prevented according to any one of claims 1 to 3, wherein the package is formed near or within a circle passing through the microwave oven. 5. A package for heating a microwave oven having a branch portion, wherein at least a part of an inner edge side of the heat seal portion of the branch portion has a protrusion protruding toward the content, and the protrusion formation portion is provided. At least one non-heat-sealing portion for gas exhaust is formed, one end of which is open to the outer edge side of the heat-sealing portion, and the other end is sealed in the direction of the convex portion. The length (W2) of the convex portion in the width direction at an arbitrary position in the width, the length (H1) from the inner edge of the convex portion to the tip of the non-heat-sealed portion, and the maximum peel strength (S) of the 15 mm-wide heat-sealed section. ) Is at least one of the combinations of the formula: H1> 1 × 10 ⁴ ×
(W2 + 6-360 / S) A package for heating a microwave oven, wherein burst is prevented, which satisfies the relationship of ^-4 . 6. The width (W) of the non-heat-sealed portion at a point 1 mm from the tip of the non-heat-sealed portion for gas exhaustion.
The package according to claim 5, wherein 3) is less than 20 mm. 7. The package for heating a microwave oven in which a burst is prevented according to claim 5, wherein a seal width (W4) at a tip of the non-heat-sealing portion for gas exhaust is 16 mm or less. 8. A package for heating a microwave oven having a branch portion, wherein a weak seal portion and a strong seal portion are formed adjacent to each other at least partially in the heat seal portion of the branch portion, and A microwave-heated package in which a burst is prevented, wherein a weak seal portion is continuous and a strong seal portion is discontinuous via a discontinuous portion for gas exhaust. 9. The seal strength of the weak seal portion at room temperature is less than 15 N / 15 mm width, and the seal strength of the strong seal portion at room temperature is 15 N / 15 mm width or more. A package for heating a microwave oven, wherein the burst is prevented as described in (1). 10. The method according to claim 1, further comprising a discontinuous portion for exhausting the gas.
At an arbitrary location having a width of 5 mm, the length (W5) of the strong seal portion in the width direction, the length (H2) from the inner edge to the outer edge of the strong seal portion, and the maximum peel strength of the 15 mm-wide strongly heat-sealed section ( At least one of the combinations in S) has the formula: H2> 1 × 10 ⁴ × (W5 + 6-360 / S)
^10. The relation of claim 8 or 9 being satisfied.
A package for heating a microwave oven, wherein the burst is prevented as described in (1). 11. The package for heating a microwave oven according to claim 8, wherein the discontinuous portion for gas exhaust is formed as a weak seal portion. 12. The package for heating a microwave oven in which burst is prevented according to claim 8, wherein the discontinuous portion for exhausting gas is formed as a non-heat-sealed portion. 13. The package for heating a microwave oven in which burst is prevented according to claim 1, wherein the branch portion has at least one branch chamber.