JPH08276966A - Microwave cooking packaging - Google Patents

Abstract

PURPOSE: To specify a site to be heated and broken to improve workability of a cook by providing a protruding part from an end rim of a seal toward contents. CONSTITUTION: A back-lined seal bag has a V-shaped site on a heat-sealed part on a side and contains contents (f) in a packaging bag sealed by a top seal (e), a center seal (g) and a bottom seal (h). A distance between an outer rim (a) and an inner rim (b) of the heat-sealed part exhibits a seal width of a V-shaped site or a U-shaped site and the sealed part has its tip (d). A packaged object sealed by such heat-sealing has its internal pressure raised by heating as moisture in the contents (f) is vaporized, and the pressure applies force for peeling off a sheet to the object. The force is first concentrated to the tip (d) of the V-shaped site, peeling is caused from the site and advances toward an outer rim of the heat-sealed part, and the V-shaped site is unsealed before force is dispersed uniformly inside the entire package.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a food packaging article that is cooked in a microwave oven, and is particularly easy to open and
The present invention relates to a packaged product for microwave oven cooking, which can remarkably improve the workability of a cook in a convenience store, a supermarket, a food section of a department store, a restaurant, a home, or the like in order to specify the opening location.

[0002]

2. Description of the Related Art Conventionally, microwave oven foods that are cooked together with a packaging bag are usually heat-shielded with an easily-openable film by a center sealer, then filled with contents, and then a series of upper and lower horizontal sealers. After being subjected to the above process, it is used as a backrest seal body.

[0003]

SUMMARY OF THE INVENTION Such a packaged article is
When heated in the microwave as it is, the expansion of water vapor from the contents ruptures the bag from the relatively weak seal strength,
In some cases, the contents leak out due to the bag breakage, and therefore, it is usually complicated to cook before it is heated, and it is necessary to make a few holes with a needle-shaped material before cooking.

[0004] The problem to be solved by the present invention is to provide a packaged article for microwave oven cooking which can specify the place where the bag is heated and ruptured when it is heated by the microwave oven, and which significantly improves the workability of the cook. It is in.

[0005]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have found that in an easily openable heat-sealed packaged article filled with contents such as foods, at least one place of the seal portion. It was found that the cooking work by the microwave oven was remarkably improved by providing a convex shaped portion in the direction from the edge to the contents, and completed the present invention.

That is, the present invention is a packaged article which is composed of an easily peelable film, has a heat seal portion formed therein, and is filled with contents, wherein the heat seal portion is an outer edge portion. The present invention relates to a packaged article for microwave oven cooking, characterized in that it has a convex-shaped portion in the direction of the contents.

The easily peelable film used in the present invention may be any of an interfacial peel type film, an interlayer peel type multilayer film and a cohesive failure type film. The interfacial peeling type film may be formed by sealing different types of sheets, and examples of the combination thereof include a combination of a polystyrene film and an ethylene vinyl acetate copolymer film, a polyethylene terephthalate and an ethylene vinyl acetate. A combination with a copolymer film and the like can be mentioned.

As the delamination-type multi-layer film, any of different kinds of multi-layer type films can be used. For example, polyethylene, polypropylene, ethylene-butene copolymer, ionomer resin, ethylene-vinyl acetate copolymer, and these resins as one component. A multilayer film composed of a resin arbitrarily selected from resins such as a polymer alloy containing

The cohesive failure type film is not particularly limited as long as it is composed of a resin component having a sea-island structure obtained by mixing various resins, and ethylene vinyl acetate copolymer Examples of the film include a resin composed of a resin mixture of polyethylene and polypropylene, a resin mixture of polyethylene and polypropylene, and the like.

Among the above-mentioned (1) to (4), the delamination type multilayer film is preferable from the viewpoint that the peelability is particularly good and the effect of the present invention becomes remarkable, and among the above-mentioned multilayer films, the first layer forming the surface layer is particularly preferable. The layer (the layer that is fused at the time of sealing) is polyethylene, and the second layer is laminated on it.
The layer is a two-layer polypropylene film, or the first layer forming the surface layer is polypropylene and the second layer is an ethylene-butene copolymer;
It is preferable that the layer is a three-layer polyethylene film from the viewpoint of excellent strength and peelability of the package.

When the delamination film is used, the thickness thereof is 20 to 50 μm, especially 25 to 4
It is preferably 0 μm. The ratio of the thickness of each layer is not particularly limited, but in the case of a two-layer type, the first layer has a thickness of 5 to 30% of the total layer and the second layer has a thickness of 95%. Is preferably 70% to 70%, and in the case of a three-layer type, the first layer is 5 to 30%, the second layer is 5 to 30%, and the third layer is
It is preferred that the layer is 90-40%.

Further, the delaminated film may be a non-stretched film, a uniaxially stretched film or a biaxially stretched film. Above all, a composite film obtained by laminating a stretched film on a multilayer film of a non-stretched film is preferable from the viewpoint of the strength of the package.

Here, as the stretched film, from the viewpoint of strength and heat resistance, biaxially stretched polyethylene terephthalate, 2
Examples include axially stretched nylon and biaxially stretched polypropylene. The thickness of these stretched films is not particularly limited, but is 10 to 50 μm, and particularly 15 to 30 μm.
It is preferred that

The stretched film preferably further has a barrier layer for blocking oxygen.
Specific examples thereof include EVOH (saponified product of ethylene-vinyl acetate copolymer) and vinylidene chloride, but it is preferable to stack them so that the barrier value is 8 cc / 24 hr, mm ² or less.

The method for producing the film is not particularly limited and may be any of a T-die coextrusion method, a round die method coextrusion method, a multi-layer extrusion coating method and the like. From the viewpoint of productivity, the T die method is used. The coextrusion method and the round die method are preferably used.

In forming a film after extrusion, as described above, it may be unstretched, uniaxially stretched or biaxially stretched, but a multilayer film is formed by coextrusion without stretching, Further, it is preferable to laminate a stretched film from the viewpoint of the strength of the obtained package, the fusion property at the time of sealing, the sealing strength and the like.

The easily peelable package can be formed into a bag by heat-sealing the film described in detail. Here, the method of heat sealing is not particularly limited, and various methods such as direct sealing with a bar sealer, impulse sealing with a momentary high current, high frequency sealing, ultrasonic sealing, etc. can be applied, but among them, bag manufacturing is easy. From the point of view, direct sealing with a bar sealer is preferable.

The suitable range of the seal strength varies depending on the material of the film used, but normally, the seal strength at room temperature should be 300 to 1500 g / 15 mm or less, preferably 300 to 1000 g / 15 mm. It is preferable in terms of excellent openability afterward.

In the present invention, a seal bar having a V-shaped or U-shaped shape as shown in FIG. 2 is used as the seal bar used at the time of heat sealing, so that a heat having a desired seal shape can be obtained. A seal can be formed.

Specific examples of the easily peelable package include a backrest seal bag, a gusset seal bag, a tubular two-way seal bag, a three-way seal bag, and a four-way seal bag. Although it may be possible, even if the package is opened explosively due to a sudden increase in pressure during cooking with a microwave oven, the opening point can be restricted and the safety of the operator can be maintained. It is preferably a seal bag.

The bag-making method of the easily peelable package is not particularly limited, and a method of continuously filling the contents and bag-making with a bag-making filling machine can be mentioned. Examples include horizontal pillow packaging machine "S-5000I" manufactured by Omori Machinery Co., Ltd. here,
In order to form a heat-sealed portion having a V-shaped portion or a U-shaped portion having a depth larger than the seal width in the obtained packaged article among the seal bars used in the packaging machine, for example, FIG. A seal bar having a V-shaped structure as shown in can be used.

The sealing temperature varies depending on the film used or the bag-making speed and is not particularly limited.
For example, when it is performed in a stationary state, it may be appropriately selected within the range of 120 to 200 ° C., but the first layer is polyethylene and the second layer laminated thereon is a two-layer type film of polypropylene. And, when the biaxially stretched sheet is laminated on the second layer, the temperature is preferably 120 to 150 ° C., and the first layer forming the surface layer is polypropylene, and the second layer is When it is an ethylene-butene copolymer, the third layer is a three-layer polyethylene film, and a biaxially stretched sheet is laminated on the third layer, the temperature may be 140 to 200 ° C. preferable. Further, from the viewpoint of productivity, the center seal is preferably sealed while running the film at a high speed.
When traveling at 5 to 20 m / min, the temperature is preferably 200 to 280 ° C. in any of the above laminated films.

In the microwave-cooked packaged article thus obtained, the easily peelable package is a backrest seal bag, a gusset seal bag, a tubular two-way seal bag, a three-way seal bag,
The shape differs depending on whether it is a four-sided seal bag or not, but a V-shaped portion or a U-shaped portion having a depth larger than the seal width is provided in at least one portion of the heat seal portion in the content direction. The heat seal portion is formed so as to have the tip portion on the side. That is, since it has a V-shaped portion or a U-shaped portion,
At the time of cooking by microwave oven, the force concentrates on the tip of the V-shaped portion or the U-shaped portion as the internal pressure increases, and as a result, the force is reliably opened from the portion and the effect of the present invention is exhibited. Is something that can be done.

The number of V-shaped portions or U-shaped portions on the heat-sealed portion is not particularly limited, but the heat tends to concentrate during cooking, and the workability is also improved, so that the heat treatment is performed. It is preferable to have one or two places on one side of the seal portion, and it is preferable to have one at one place.

Further, in the present invention, the V-shaped portion or the U-shaped portion is not limited to a U-shaped or V-shaped portion, but is seen from the front of the article in at least one portion of the linear heat seal portion. As long as it has a shape that travels unevenly, it may be a V-shape having a sharp or obtuse tip, or a U-shape or an arc shape having a curved protrusion. It may be. Here, the tip portion always faces the content direction, and the depth of the V-shaped portion or the U-shaped portion is larger than the seal width. Where V-shaped part or U
The depth of the character-shaped portion refers to the shortest length from the line outside the heat-sealed portion (the straight line connecting the bending points at the outer edge of the heat-sealed portion) to the deepest portion of the recess in the V-shaped portion or the U-shaped portion.

The depth of the V-shaped portion or the U-shaped portion is
The width is not particularly limited as long as it is larger than the seal width, but it is preferably 1.1 to 20 times the seal width, and particularly 2 from the viewpoint of easy opening.
It is preferably ˜4 times.

Further, the shape of the V-shaped portion or the U-shaped portion is preferably a V-shaped portion having a sharp tip portion from the viewpoint of easy peeling.

An example of such a backpack sealing bag having a V-shaped structure on one side of the heat-sealed portion in the packaged product for microwave cooking according to the present invention will be described in detail with reference to FIG. As mentioned above, there is a package bag in which the content (f) is contained in a packaging bag which is sealed by the top seal (e), the center seal (g) and the bottom seal (h). Here, a indicates the outer edge portion of the heat seal portion, b indicates the inner edge portion of the heat seal portion, and the distance between the outer edge portion a and the inner edge portion b is the “seal width of the V-shaped portion or the U-shaped portion”. . Further, c indicates the deepest part of the concave portion in the V-shaped portion or U-shaped portion, and d indicates the tip of the V-shaped portion or the U-shaped portion. Furthermore, "the depth of the V-shaped portion or the U-shaped portion" means the bending point (a
-1), the shortest distance from the straight line connecting (a-2) to the deepest part c of the recess.

The contents (f) to be stored in the microwave-cooked packaging article are not particularly limited, and any food that can be cooked in a microwave oven may be used. Therefore, the improvement effect of the present invention becomes remarkable when the food is a semi-solid food.

Next, FIG. 3 shows how the article shown in FIG. 1 is opened by heating and cooking. That is, in the packaged article of the present invention sealed by heat sealing, the internal pressure increases due to the evaporation of water in the content (f) due to heating, and the pressure causes the packaged article to have a force for peeling the sheet. Join. The force first concentrates on the tip d of the V-shaped portion, peels off from the portion and progresses toward the outer edge of the heat-sealed portion, and before the uniform distribution of the force on the entire inside of the package, V occurs. The letter-shaped part is to be opened.

[0031]

The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples.

Example 1 12 μm of vinylidene-coated biaxially stretched polyethylene terephthalate film and a coextruded multilayer film “DIFAREN PP-10” manufactured by Dainippon Ink and Chemicals, Inc.
0 ”30 μm (polyethylene / ethylene-butene random copolymer / polypropylene = 80/10/10) is used for packaging with a horizontal pillow packaging machine“ S-5000I ”manufactured by Omori Machinery Co., Ltd. Speed 75 Individual/
In minutes (pitch 220 mm), the top seal bar uses a V-shaped central part shown in Fig. 2 and has a solid seal, and the bottom seal bar and the center seal bar are straight lines set in the packaging machine. We used a general product from the above to wrap the kneaded product of microwave-cooked food, and identified the opening property and the opening location. FIG. 4 shows a perspective view of a packaged product after packaging.

The seal temperature is 160 ° C./150° C. for the top seal and the bottom seal and 25 ° C. for the center seal.
Performed at 0 ° C.

The top seal of the obtained packaged article had the following shape. Seal width: 3 mm Concavo-convex shape: V-shaped Depth of V-shaped part: 7 mm Width between bending points: 15 mm

Evaluation results Twenty samples were prepared and a commercial microwave oven 1500W
As a result of visual inspection after heating for 25 seconds, all were opened from the top seal part.

Example 2 The same packaging material as in Example 1 and the type in which only the top seal bar was processed to have two V-shapes under the same packaging conditions were used. The location was identified.

The V-shape itself in the top seal of the obtained packaged article was exactly the same as in Example 1. Evaluation Results Similar to Example-1, 20 samples for commercial microwave oven 1500 W × 25 seconds were visually evaluated after cooking, and all samples were opened from the top seal portion.

Example 3 The same packaging material as in Example 1 was used, and under the same packaging conditions, the top seal bar alone was replaced by a type processed to have two V-shapes. The location was identified.

The top seal of the obtained packaged article had the following shape. Seal width: 3 mm Concavo-convex shape: U-shaped Depth of U-shaped part: 7 mm Width between bending points: 15 mm

Comparative Example 1 The same packaging material as in Example 1 and the same type of top seal bar as the bottom seal bar were set under the same packaging conditions as in Example 1.
Similarly to the above, the opening property and the opening location were specified.

Evaluation Results As in Examples 1 and 2, the results of visual inspection after heating and cooking with a commercial microwave oven for 1,500 W × 25 seconds using 20 samples, all 20 were opened, but as shown in Table 1 It wasn't constant.

Therefore, it has been clarified that the processing of the top seal bar shown in Examples 1 and 2 is very effective for keeping the unsealed portion constant.

[0043]

[Table 1]

Comparative Example 2 Under the same packaging conditions as in Comparative Example 1, a top seal bar of the same type as the bottom seal bar was set, and vinylidene-coated biaxially oriented polyethylene terephthalate 12μ and ethylene vinyl acetate copolymer were used as the packaging material. Thing 30μ
Using a multilayer film obtained by extrusion laminating polyethylene with 20 μm, the unsealing property and the unsealed portion were specified.

Evaluation Results Similar to Comparative Example 1, 20 samples were heat-cooked with a commercial microwave oven for 1,500 W × 25 seconds, and the result of visual judgment was 12 as shown in the table below. There were 8 pieces that had high sealing strength and were not opened. In addition, the opening location is not constant, and 6 out of 12 opened
The contents could not be eaten because the contents were scattered in the microwave oven due to the influence of the internal pressure.

[0046]

[Table 2]

[0047]

According to the present invention, it is possible to provide a packaged article for microwave oven cooking in which the place to be opened by heating can be specified when heating with a microwave oven, and the workability of the cook is significantly improved.

[Brief description of drawings]

FIG. 1 is a front view of a packaged article for microwave cooking according to the present invention.

FIG. 2 is a perspective view of a top seal bar having one V-shape.

[Fig. 3] Fig. 3 is a process drawing showing the state of opening by heating and cooking.

FIG. 4 is a perspective view of the microwave oven packaged article of the present invention.

[Explanation of symbols]

 a: Outer edge of heat seal part a-1: Bend point a-2: Bend point b: Inner edge part of heat seal part c: Deepest part of V-shaped part d: Tip part of V-shaped part e: Top seal Part f: Contents g: Center seal part h: Bottom seal part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Saburo Ishii 1-3 Nedo, Kashiwa-shi, Chiba Itoham Co., Ltd.

Claims (10)

[Claims] 1. An easily peelable packaging body having a heat-sealing portion, which is filled with contents and has a V-shaped portion having a depth larger than a seal width in a part of the heat-sealing portion, or A packaged article for microwave cooking, wherein the U-shaped portion is formed so as to have its tip on the content direction side. 2. The packaged article for microwave cooking according to claim 1, wherein the easily peelable package having the heat-sealed portion is composed of an interlayer peelable multilayer film. 3. A multilayer coextruded film made of different kinds of materials constituting an easily peelable package, wherein the first layer forming the surface layer is polypropylene and the second layer laminated thereon is ethylene-butene. The microwave oven cooking packaging article according to claim 1 or 2, which is a copolymer or a third layer polyethylene. 4. The packaged article for microwave cooking according to claim 3, wherein the ratio of the thickness of the first layer to the thickness of the second layer of the laminated film is former / latter = 0.01 to 1.0. 5. The depth of the V-shaped portion or the U-shaped portion formed in the heat seal portion is 1.1 with respect to the seal width.
The packaging article for microwave oven cooking according to claim 1, 2, 3 or 4, which is about 20 times. 6. The packaged article for microwave cooking according to claim 5, wherein one or two V-shaped portions or U-shaped portions are provided on one side of the heat-sealed portion. 7. The packaging article for microwave oven cooking according to claim 1, wherein the easily peelable packaging body having a heat-sealed portion is a backrest packaging body made of a coextruded multilayer film. . 8. The seal strength at room temperature of a heat-sealing portion having a V-shaped portion or a U-shaped portion is 300 to 150.
The packaging article for microwave oven cooking according to any one of claims 1 to 7, which has a weight of 0 g / 15 mm. 9. The packaged article for microwave cooking according to any one of claims 1 to 5, wherein the content is a semisolid food placed on a tray. 10. The packaged article for microwave cooking according to claim 9, wherein the tray is a hygroscopic tray.