JPH09150864A - Packing body for cooking and method of relieving pressure therein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a packing body due to pressure increase by cooking the inside by providing a joining part to join plastic films by a heat seal pulling the joining part to one side part of the packing body, and forming the plastic films as an easily-openable seal to relieve the pressure. SOLUTION: One side surface of end sides 1a, 1b of a plastic film 1 is abutted on each other, and first joining part 2 by a heat seal is provided to make the film 1 cylindrical. Then, the first joining part 2 is pulled to one side part, and a second joining part 3 is provided on a cylindrical lower part in a similar manner to form a hand-joining shaped bag 4. After contents 5 is put in the bag 4, a third joining part 6 is formed on a cylindrical upper part in a similar manner to obtain a packing body A by performing the sealed packing. The first joining part 2 is of easily-openable seal, and functioned as a pressure relieving part 7, and facilitates peeling when the desired internal pressure due to heating is reached to allow this pressure to be rapidly relieved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package filled with food or the like, which allows the contents such as food to be cooked in a microwave oven as it is, and prevents the package from rupturing due to an internal heating rise pressure. The present invention relates to a heat treatment package and a heat release package pressure relief method.

[0002]

2. Description of the Related Art Conventionally, many packaged foods have been prepared in which cooked or semi-cooked foods are filled in a heat-resistant plastic packaging bag and cooked by a microwave oven immediately before eating. .

However, when the packaged food is heated by a microwave oven, the internal pressure rises due to the thermal expansion of water vapor and the internal air inside the bag, and finally the expansion pressure causes the bag to burst and the contents to be scattered. Moreover, there is a drawback that the inside of the microwave oven is contaminated.

Therefore, before microwave cooking, a small hole is made in the bag in advance to suppress the rise in the internal pressure and prevent the bag from bursting.

However, in this method, the steam generated by the start of heating is immediately discharged to the outside of the bag, and the steaming cooking effect due to the steam is reduced, and the food inside the bag is dried so that the taste is improved. Deterioration.

Developed to eliminate these drawbacks,
Further, as shown in FIG. 9 and FIG. 10, there is provided a packing body which is a multi-purpose bag which is opened in the longitudinal direction of the bag due to its usability when the bag is torn from a notch provided at a proper position. Has been done.

In this case, when the internal pressure rises above a certain level, the palm part 50 heat-sealed with an easy-open film that peels off at that location to release the pressure is a bag 51.
It is provided at the center in the width direction (single dimension direction).

Therefore, when this was put into a microwave oven and cooked, the film was strained due to the expansion due to the increase of the internal pressure, and the heat-sealed gas palm section 50 was folded as shown in FIG. According to the crease, the piece of the gas palm section 50 comes into close contact with the bag 51 and the peeling angle becomes 0, and even if the internal pressure rises, the peeling action of the seal section cannot be given. Out of steam,
That is, in the figure, the relief pressure indicated by the arrow p is obstructed, and eventually the internal pressure increased to the limit point of the bag strength,
The bag 51 had a big problem of bursting.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is a packaging body formed of a plastic film in the shape of a palm, and has an easy-opening property which is the palm portion. By molding the first joint part to one side of the package, the contents such as food can be cooked in a microwave oven while being packaged, and steam expanded due to the rising pressure inside can be smoothed. An object of the present invention is to provide a package for heat treatment which can prevent the package from bursting and a method for releasing pressure of the package for heat treatment.

[0010]

[Means for Solving the Problems] The means of the present invention for achieving the above-mentioned object is a first method in which the same surface sides are brought into contact with each other by a plastic film and they are joined together in a palm shape by heat sealing with a predetermined width. In a packaging body in which a joint portion is provided and the contents for heat treatment are hermetically packaged therein, the first joint portion is provided by being offset to one side portion of the packaging body, and is packaged by heating. It is in the constitution of a package for heat treatment which is an easily-openable seal that releases pressure when the internal pressure of the body rises.

This easy-open seal has a constitution of a heat treatment package having a peeling force of 1200 g / 15 mm or less when heated at 90 ° C.

Further, a plastic film is formed so that both sides thereof are brought into contact with each other on one side surface thereof, and a first joint portion by heat sealing having a predetermined width is provided to form the film into a tubular shape. In the state of being shifted to the side portion of the cylindrical shape, a second joint portion is provided on one side of the cylindrical shape by heat sealing to form a pouch-shaped bag body, and then the inside is filled with the contents to form the cylindrical shape. In a package for heat treatment in which the other side is heat-sealed to form a third joint portion and hermetically packaged, the first joint portion is an easy-open seal, and the easy-open seal is 90 In the constitution of the heat treatment package, the peeling force when heated at ℃ is 1200 g / 15 mm or less.

Further, by using a plastic film, the both sides are brought into contact with each other on one side and a first joint portion by heat sealing having a predetermined width is provided to make the film into a tubular shape. In the state of being biased to the side portion of the side opening, a second joint portion by heat sealing is provided in the tubular opening to form a palm-shaped bag body, and the other side of the side portion where the first joint portion is biased An opening is formed by incision at the edge, the contents are filled into the bag body through this opening, and the opening is formed into a third joint by heat sealing to form a hermetically sealed package for heat treatment. The first joint portion is an easily-openable seal, and the easily-openable seal has a heat treatment packaging body having a peeling force of 1200 g / 15 mm or less when heated at 90 ° C.

Then, the package is housed in a microwave oven to heat-treat the contents, and the package is expanded due to air expansion and generation of water vapor inside the package, whereby the surface on the first joint portion side is expanded. In the above, the short piece side is substantially erected with the first joining portion sandwiched therebetween to avoid contact or proximity of this short piece surface with one side surface of the joined first joining portion. There is a pressure relief method for a heat treatment package in which opening is caused to promote pressure relief from a pressure relief portion at a proper position in the first joint portion.

Further, the pressure relief portion is provided so as to be located substantially at the top of the expansion of the package when the first joint portion is heated and expanded.

[0016]

The present invention configured as described above has the following effects.

In a package formed in the shape of a palm, the first joint portion serving as the palm has an easy-opening property, and is formed in a state in which it is biased to one side of the package. There is.

Therefore, after the contents are filled in the inside, the upper part is hermetically sealed by heat sealing to form a heat treatment package suitable for storage and management.

When this is heat-treated, it is housed in a microwave oven and heated at a predetermined temperature and for a certain period of time. If the internal pressure rises due to the generation of water vapor or thermal expansion of the internal air accompanying this heating, The pressure relief part provided in one joint part separates and the internal gas is discharged, and the pressure drops.

At this time, since the first joint portion is attached so as to be biased to one side in the packaging body, when the packaging body is inflated, the short piece side is substantially erected by the tension due to the expansion on both sides of the first joint portion. The first joint portion rises to the upper surface of the packaging body due to the tension of the packaging film on the opposite long side of the packaging body, and the one side surface of the first joining portion and the packaging surface are brought into contact with or close to each other. Avoided.

Further, since the communication hole of the pressure relief portion is located at the upper part of the package, the contents do not leak from the communication hole.

For this reason, the excess pressure that has risen in the package acts on the proper position of the first joint portion having the easy-opening property and causes peeling, so that the internal pressure is released.

When the proper position of the first joint portion, that is, the pressure relief portion is provided so as to be positioned substantially at the top of the expansion of the package during heat expansion, the pressure is easily released.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an example of the heat treatment package and the method of releasing pressure of the heat treatment package according to the present invention will be described with reference to the drawings.

In FIGS. 1 to 3, reference numeral A denotes a heat treatment package, which accommodates an article to be used by applying a predetermined amount of heat to the inside thereof and heat-treats it by a heating means such as a microwave oven at the time of its use. , It is for tearing a part of it and taking out the contents.

The configuration of the first example is shown in FIG.
As shown in (a), the plastic film 1
The both sides 1a and 1b are brought into contact with each other on one side surface (the same surface of the upper surface in the figure), and a first bonding portion 2 by heat sealing having a predetermined width is provided to form the film 1 into a tubular shape.
In a state where the first joint portion 2 is biased to one side portion,
As shown in (b), after the second joint portion 3 by heat sealing is provided on the lower portion of the tubular shape to form the palm-shaped bag body 4,
A package A is obtained by filling the contents 5 into the inside thereof and forming the third joint portion 6 by heat sealing on the cylindrical upper portion and hermetically packaging.

Further, in the configuration of the second example, as shown in FIG. 5A, both ends 1a and 1b of the plastic film 1 are abutted against each other on one side surface (the same surface of the upper surface in the figure). The film 1 is formed into a tubular shape by providing a first joining portion 2 by heat sealing with a predetermined width, and the first joining portion 2 is biased to one side portion, and the first joining portion 2 is provided on both sides of the tubular shape. Second joints 3 and 3 by heat sealing are provided in the openings 1e and 1f to form a palm-shaped bag body 4, and an opening is formed by cutting into the other side edge 1g of the side where the first joint 1 is offset. 1
h is formed, and the contents 5 are introduced from the opening 1h into the bag body.
Is filled, and the opening 1j is heat-sealed to form the third joint portion 6 and hermetically sealed to obtain the package A.

In the second example, although not shown, two plastic films are preliminarily superposed on each other, and the first joint portion is formed by heat-sealing in a chisel shape with the one side portion biased to one side. After further forming a second joint by heat sealing on both sides and filling the content from the remaining one opening, this opening is provided with a third joint by heat sealing and the inside is hermetically sealed. It is also possible to form a heat treatment package.

The above-mentioned plastic film 1
Is made of a plastic material having heat resistance to heating in a microwave oven. For example, a biaxially stretched film made of polypropylene, polyamide, polyester, ethylene-vinyl alcohol copolymer, or the like, a vinylidene chloride-acrylate copolymer is used. Substrates such as a coalesced film, an aluminum oxide vapor-deposited biaxially stretched polyester film, and a polymetaxylylene adipamide polyamide stretched film (including a co-extruded laminated film with 6-nylon) are used.

The above-mentioned first joint portion 2 is an easily-openable seal. For example, the plastic film 1 is made by combining the above-mentioned base material with a suitable polyolefin resin as a sealant layer to be an easy-open film.
Or an easy-open film tape to be inserted between the palms when forming the first joint portion 2, and provided on the whole surface or a part thereof in the length direction, of which part In the case of insertion into the package A, as shown in FIG. 4, it is provided so as to be located at the substantially expanded top X of the package A, that is, at the substantially central part of the package A at the time of thermal expansion. It becomes a pressure relief portion 7 described later.

The easy-open film has a peel strength of 150 to 1800 g / 15 m at its seal portion.
m, preferably about 500-800 g / 15 mm. However, the peeling strength is 300% in accordance with the test method for sealed packaging bags based on the Food Sanitation Law-Z0238.
It is a value measured in mm / min.

Furthermore, the above-mentioned easy-open seal of the first joint portion 2 has the following features when the sealant layer is provided on the base material.
Melting point (testing method according to ASTM D2117) is 12
A polyolefin resin or the like having a temperature of 0 ° C. or lower, preferably 90 to 105 ° C. is used.

As another example, a tape made of a polyolefin resin or the like having a melting point of 120 ° C. or lower, preferably 90 to 105 ° C. is inserted into the easily openable seal portion, or
It is also possible to apply a resin having these characteristics, and in that case, a sealant layer of the base material having a melting point higher than that of the tape by 10 ° C. or more is used.

The easy-open seal of the first joint portion 2 has a peel force of 150 to 120 when heated at 90 ° C.
0 g / 15 mm, preferably 500 g / 15 mm or less is suitable.

Further, as shown in FIG. 1, the pressure relief portion 7 is formed in the entire width direction of the first joint portion 2, so that the pressure is most likely to be applied to the package A when heated and expanded. Part X starts peeling first.

However, as a better means of relieving pressure, FIG. 3 (a) in the first example and FIG. 7 (a) in the second example.
As shown in, the total length L of the package A at the first joint portion 2
A non-sealing portion 7a having a semicircular shape, a triangular shape, a quadrangular shape or the like is formed on the outer edge side in the width direction of the first joint portion 2 so as to be located at a substantially central portion (a dimension position of L / 2) in the middle position. To do.

Further, as shown in FIG. 3 (b) in the first example and FIG. 7 (b) in the second example, a triangle, a quadrangle or a semicircle is formed on the outer edge side in the width direction of the first joint portion 2. The cut-off portion 7b is formed.

In any case, since the width of the first joint portion 2 is narrowed by the non-sealing portion 7a and the cut portion 7b, when the desired internal pressure at the time of heating is reached. The first joint portion 2 is easily peeled off and the pressure is quickly released.

Incidentally, FIG. 1 (c), FIG. 3 and FIG.
(D), 8 in FIG. 7 is a notch for tearing when opened at a proper position of the package A, which is provided near the first joint 2 on the short side of the package A or on the other side. It is provided or the like, and an opening is obtained in parallel toward the long side of the package A. This means that the package A is turned upside down when the contents 5 are transferred to a container such as a plate. If the notch 8 is opened to prevent the contents 5 from leaking, the contents 5 can be easily taken out like the three-sided bag.

Particularly in the second example, when opening from the notch 8, the shape is similar to that of a general three-sided bag, so that there is no leakage of the contents when transferring to a plate or the like, and handling thereof Will be good.

The first example of the embodiment of the present invention thus constituted is, for example, a conventional pouch with a composite film 1 made of a heat-resistant biaxially stretched polyamide base material and a sealant layer film. Bag making machine (not shown)
Therefore, as shown in FIG. 1A, both end sides 1a, 1
The first bonding portion 2 by heat sealing is provided by abutting b so that their upper surfaces are flush with each other.
Is cylindrical.

Then, in a state where the first joint portion 2 is biased to one side portion in the length direction, FIG.
As shown in FIG. 5, the lower part of the tubular shape is provided with the second joint part 3 by heat sealing to form the palm-shaped bag body 4.

When the contents 5 such as a food product having fluidity, for example, entangled with food, is filled into the inside of the bag body 4 thus formed, and the heat-sealed third joint portion 6 is formed on the cylindrical upper portion. The package A for heat treatment, which is hermetically sealed and is suitable for storage and management, is formed.

When the package A is cooked at the time of eating, it can be eaten immediately after opening if it is housed in a conventional microwave oven and heated at a predetermined temperature and time.

In the heating by the microwave oven, when the internal pressure rises above a certain level due to the generation of water vapor in the inside and the thermal expansion of the previously sealed internal air, the first joint portion is heated. 2 pressure relief section 7
However, this internal pressure causes peeling, and the pressure is reduced by discharging vapors such as water vapor and expanded air inside.

At this time, since the first joint portion 2 is attached so as to be biased to one side in the package A, when the package A expands, as shown in FIG. The short piece side 1c is placed in a substantially upright state by the tension due to the expansion with the joint portion 2 interposed therebetween, and the opposite long piece side 1d of the package A is formed.
Due to the tension of the film, as shown in FIG. 2B, the first joint portion 2 rises to the upper surface of the package A, and one side surface of the first joint portion 2 and the short side 1c surface of the package A. So-called constant peeling angle θ that avoids contact or proximity of
Is obtained.

Therefore, the excessive pressure that has risen in the package A is applied to the proper place of the first joint portion 2 having the easy opening property, that is,
It acts in the pressure relief portion 7 and peels off the pressure relief portion 7 by cohesive failure or the like. Therefore, by releasing the internal pressure, the package A
Is prevented from bursting.

In this pressure relief action, the pressure relief portion 7 of the first joint portion 2 is located at the substantially expanded top X of the package A when heated and expanded, as shown in FIG. If it is provided in advance, the pressure relief effect will be further improved, and since the communication hole of the pressure relief portion is located at the upper part of the package, leakage of the contents does not occur from this communication hole. It is a thing.

Further, the first joint portion 2 in this package A is
When heated in a microwave oven, as described above, due to the heating and relieving action thereof, a crease having a predetermined peeling angle θ is formed, and even after the heating is completed, the first bonding portion is formed. By moving 2 to one side,
Since the opening of the communicating hole of the pressure relief portion 7 keeps a predetermined upright state in which this folding tendency is not restored, as shown by an imaginary line in FIG. The leakage of the object 5 does not occur.

Furthermore, if the non-sealing portion 7a and the cutout portion 7b are provided in the pressure relief portion 7, the relief of the internal pressure can be further improved.

As shown in FIG. 8 (a), the ratio of the above-mentioned first joint portion 2 to the one side portion of the package A is in the width direction of the package A, and one end portion As shown in FIG. 8 (b), it is within a range of about 40% from one end 1s from a position closer to the center by a dimension z than 1s,
Preferably, it is within the range of 30% from the one end 1s.

When the first joint portion 2 is set at a position of 40% or more within this range, the peeling angle becomes close to 0 and the relief effect is remarkably reduced, as described in the section of the prior art. Similarly, when the first joint portion 2 is formed without providing the dimension z described above, similarly, the relief pressure action is reduced, and even if the relief pressure is released, the content from the communicating hole due to this relief pressure is A leak of material occurs.

The operation of the second example of the embodiment of the present invention is also the same as that of the first example described above, as shown in FIG. 6, and thus the same effect is exerted. Therefore, detailed description thereof will be omitted.

[0054]

According to the present invention having the above-described structure, the first joint portion having the easy-opening property is provided so as to be biased to one side portion of the package so that when the package expands, The short piece side is placed in a substantially upright state by the tension due to expansion across the one joint portion, and the tension of the packaging film on the opposite long piece side causes the first joint portion to rise up to the upper surface of the packaging body, and the first joint By avoiding contact or proximity of one side surface of the package and the package surface, a sufficient peeling angle can be obtained at this first joint, and smooth escaping of the internal pressure of the package can be achieved, resulting in overexpansion. It is possible to prevent the package from bursting.

Particularly, at the time of thermal expansion at the first joint,
By providing the pressure relief portion so as to be positioned substantially at the top of the expansion of the package, the excess pressure in the package can be more smoothly released.

Further, when the package is heated, the heating and the relief pressure form a crease with a predetermined peeling angle at the first joint portion to make the fold upward, and the package shrinks after the relief. Even if the contents do not leak out. And the like.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a manufacturing process of a heat treatment package of a first example adopting the method of the present invention.

FIG. 2 is a cross-sectional view of the heat treatment package in FIG. 1, in which (a) represents before or after heating, and (b) represents during heating.

FIG. 3 is a front view showing each example of the first joint portion in FIG.

FIG. 4 is a vertical sectional side view of the packaging body in FIG.

FIG. 5 is a perspective view showing a manufacturing process of the heat treatment package of the second example adopting the method of the present invention.

6 is a cross-sectional view of the heat treatment package in FIG. 5, in which (a) represents before or after heating, and (b) represents during heating.

FIG. 7 is a front view showing each example of the first joint portion in FIG.

FIG. 8 is an explanatory diagram showing a first joint portion forming position in the packaging body for heat treatment according to the example of the present invention.

FIG. 9 is a perspective view showing a conventional food packaging bag.

10 is a plan view of FIG. 9.

[Explanation of symbols]

 1 Plastic Film 1a, 1b Both End Sides of Film 1 2 First Joining Part 3 Second Joining Part 4 Bag 5 Contents 6 Third Joining A A Heat Treatment Package 7 Relief Part X Expansion Top

Claims (6)

[Claims] 1. A first joint portion, which is made of a plastic film and is brought into contact with each other on the same surface side thereof, and is joined in a palm-shape by heat sealing with a predetermined width, and the contents for heat treatment are hermetically sealed therein. In the packaging body, the first joint portion is provided so as to be biased to one side portion of the packaging body, and when the internal pressure of the packaging body due to heating rises, the easy-open seal is provided. A package for heat treatment, characterized in that 2. A plastic film is used to bring the same surface side into contact with each other and to provide a first joint portion which is joined in a palm shape by heat sealing with a predetermined width, and the contents for heat treatment are hermetically packaged therein. In the packaging body, the first joint portion is provided so as to be biased to one side portion of the packaging body, and when the internal pressure of the packaging body due to heating rises, the easy-open seal is provided. The easy-open seal has a peel force of 1200 g / 15 mm or less when heated at 90 ° C., which is a heat-treating package. 3. A plastic film having both ends thereof abutting each other on one side thereof, and provided with a first joining portion by heat sealing having a predetermined width to form the film into a tubular shape,
In a state where the first joint portion is biased to one side portion, a tubular joint side is provided with a second joint portion by heat sealing to form a pouch-shaped bag body, and then the contents are placed inside thereof. In a package for heat treatment in which the third side of the tubular shape is filled and sealed to form a third joint by heat sealing, the first joint is an easy-open seal. The easy-open seal has a peeling force of 1200 g / 15 mm or less when heated at 90 ° C., which is a package for heat treatment. 4. A plastic film is formed into a tubular shape by providing both ends of the plastic film with one side surface thereof in contact with each other and providing a first joint portion by heat sealing with a predetermined width,
In a state where the first joint portion is offset to one side portion, a second joint portion by heat sealing is provided in the tubular opening portion to form a palm-shaped bag body, and the first joint portion is separated from each other. An opening is formed on the other side edge of the drawn side by cutting, the contents are filled into the inside of the bag through this opening, and the opening is formed into a third joint by heat sealing, and sealed and packaged. In the heat treatment package, the first joint portion is an easy-open seal, and the easy-open seal has a peel force of 1 when heated at 90 ° C.
A package for heat treatment, which is 200 g / 15 mm or less. 5. A first joint portion, which is made of a plastic film and abutted on the same surface side to each other, and is joined in a palm shape by heat sealing with a predetermined width, is provided with a heat-sealing content sealed therein. The first joining portion is an easily openable seal that is provided by being biased to one side portion of the packaging body and releases the pressure when the internal pressure of the packaging body increases due to heating. A package for heat treatment, wherein the package is housed in a microwave oven to heat-treat the contents, and the package is expanded due to air expansion and generation of water vapor inside the package, whereby the first joint portion is formed. On the side surface, the short piece side is substantially erected while sandwiching the first joint portion,
This short side surface is prevented from contacting or approaching one side surface of the joined first joint portion to cause easy opening due to the expansion pressure of the heating, and the escape from the relief portion at a proper position in the first joint portion. A pressure relief method for a package for heat treatment, characterized in that pressure is accelerated. 6. The relief package of the heat treatment package according to claim 5, wherein the pressure relief portion is provided so as to be located at a substantially expansion top of the packaging body at the time of thermal expansion at the first joint portion. Pressure method.