JP2002145354A - Sealed packaging bag applicable to heating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealed packaging bag for a microwave oven in which vapor can be discharged surely and efficiently from a location where a vapor discharging mechanism is arranged. SOLUTION: There is provided a vapor discharging mechanism comprised of a heat seal region for the innermost layer films where the heat seal segments having corners of a shape protruded toward the inner side of a packaging bag are formed in at least one end or a side part in which the laminated sheets are overlapped and they are closed by heat sealing the innermost layer films, and a weak adhering region that can be peeled and arranged at an inter-layer adhering region between the innermost layer film overlapped on the heat seal region and a film layer adjacent to the innermost layer film characterized in that the weak adhering region that can be peeled is comprised of a weak adhering region B covering a region overlapped on the heat seal segment having the corners and a weak adhering region B showing a lower strength in peeling than that of the former one and arranged at the end edge side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetically sealed packaging bag which can be heated by a microwave oven or the like so that cooked items such as Chinese cooking utensils and curry can be cooked in a microwave oven.

[0002]

2. Description of the Related Art In general, a packaged product containing an article to be cooked that generates steam when heated, such as a Chinese cooking utensil, is liable to burst due to internal pressure when a microwave oven is used. Has been adopted. In addition, when cooking in a microwave oven, it is necessary to release steam without leaking liquid.Conventionally, a check valve is attached to the package, or a part of the package is cut with scissors immediately before cooking. Or was. However, when the above-described check valve is adopted,
There is a problem that the function is incomplete or the cost is high, and it is not generally used, and there is also a risk that a liquid product to be cooked may be boiled and spilled.

Therefore, a packaging bag as shown in FIG. 6 has been proposed. This packaging bag is manufactured by folding the laminated sheet 101, heat-welding the inner surfaces of both ends 101 and the back pasting portion 103 to form an accommodating portion 102 for accommodating an article to be cooked inside. Yes, back part 10
In FIG. 3, a first passage 104 and a second passage 105 are formed as regions where the inner surfaces of the packaging sheet are not thermally welded to each other. In such a packaging bag, the end of the second passage 105 is opened by cutting or the like, and the steam generated by the heating is discharged to the first passage 105.
It discharges to the outside through the passage 104 and the second passage 105, and can heat the article to be cooked using a microwave oven. However, such a packaging bag, when packaging the food to be cooked and then subjected to a sterilization treatment by heating or the like, causes the first problem.
In some cases, not only the steam but also the product to be cooked may enter the passage 104 and the second passage 105. In the final product, there is moisture condensed in the steam or the product to be cooked in the passage, which may impair the aesthetic feeling. Had a problem.

Accordingly, the present inventors have solved the above problem, and efficiently discharge steam generated while preventing leakage of an article to be cooked by heating in a microwave oven. We have proposed a microwave oven package and a microwave packaging bag which do not reduce the commercial value.
JP-A-310181, JP-A-11-278558).

[0005] Representative examples of these packaging bags for microwave ovens are:
As shown in FIG. FIG. 7 shows one laminated sheet 111 having a heat-welding film in the inner layer, as shown in FIG.
The inner layer is folded so that the inner layers face each other, and the inner layers are thermally welded at the back apposition portion and both ends to seal the ends and the like, and the back apposition portion 112 is disposed in a sideways state as shown in the figure. A re-peeling portion 113 (a portion within a dotted line) formed of a weakly bonded portion is formed in a bonding region between the outer film and the inner film of one of the packaging sheets 111 constituting the upper surface in the lying state. In this packaging bag, when the inside of the bag body 114 expands due to heating or the like, the inner film in contact with the re-peeling portion 113 is broken by the force of the force, and steam flows between the outer film and the inner film from the opening of the inner film. Then, a vapor passage is formed while separating between the outer film and the inner film to be discharged to the outside.

FIG. 8 shows an improved mechanism for discharging steam to the outside, which is provided on the central back portion of the packaging bag for a microwave oven shown in FIG. In addition to maintaining the proper size, it is possible to prevent the packaging bag from expanding while the back affixed portion is bent, so that the steam passage is not blocked, and the steam can be efficiently discharged. Then, the re-peeling section 1 formed by making a weak adhesive zone between the outer layer film and the inner layer film of the packaging sheet 111 located outside the back pasting section 112.
13 (a region surrounded by a dotted line), a plurality of steam outlets 115 and 116 for discharging steam passing between the outer film and the inner film to the outside, and each of these steam outlets Steam guide passages 117 and 118 formed in the re-stripping portion for guiding steam are formed.

Further, these steam guide passages 117, 11
In the zone where the inner films of the packaging sheet of the back affixing part corresponding to the position 8 are thermally welded to each other, the action bar 120 is provided.
And an inner film breaking tip (projection) portion 1 formed integrally with at least one end of the action bar portion and projecting toward the base end side (inside the packaging bag) of the back pasting portion.
21 and 122 are formed, and a wedge-shaped or tapered-shaped heat source having a shape that is wide at the base end side of the back adhering portion adjacent to the breaking tip end portion and converges toward the free end side therefrom. Zones that are not welded (heat-sealed) are provided as sub-chambers 123 and 124 that have a function of causing internal vapor to invade and raise the back patch when the packaging bag is inflated. Then, when the packaging bag is heated and expanded, a break occurs in the inner layer portion in contact with the protruding break end portions 121 and 122.

[0008]

The packaging bag for a microwave oven shown in FIGS. 7 and 8 is extended from a storage portion for storing an article to be cooked and a central portion of the storage portion so that steam is supplied to the outside when heating the microwave oven. It consists of a back affixing section provided with a steam discharge mechanism capable of discharging. In this packaging bag, when the article to be cooked is stored in the storage section, the storage section is widened and the central backing section rises, so that the steam can be reliably discharged from the backing section. However, in a state where the central backing portion is protruded from the packaging bag body, for example, when displayed on a storefront display shelf, the central backing portion comes into contact with fingers and gets in the way,
For the reason that they cannot be stacked and displayed neatly on shelves, for example, the articles to be cooked are stored in a bag and sealed, and then the whole product is further packaged and put on the market with the central back affixed portion folded. The necessity of such an exterior material has a disadvantage that packaging cost is increased. Although rare, when the product is taken out of the exterior material, if the product is bent and the central back affixed portion is not erected and is lying down, it may hinder vapor release.

In order to eliminate overhang of the central backing portion, instead of providing a steam discharge mechanism at the center backing portion of the bag, it is provided at one end of the bag, for example, at the bottom portion, so that the packaging for the microwave oven which does not overhang and is easy to handle is provided. Bags can be provided. However, when using a continuous filling and packaging machine to fill a solid food product from a certain height, if the product to be cooked is a heavy solid food product such as menchikatsu, the steam discharge provided at the bottom due to collision will occur. The mechanism is damaged,
It encounters new problems such as insufficient vapor release and cracks, which may cause liquid leakage of products filled with liquid seasonings such as sauce and dashi juice. .

[0010] The present invention solves the above problems, is easy to handle, and even when a heavy solid food is dropped and filled using a filling and packaging machine, there is no effect on a portion provided with a steam discharge mechanism. It is an object of the present invention to provide a sealed packaging bag for a microwave oven, which can be filled in a bag without exerting the influence, and which can surely and efficiently discharge steam from a portion provided with a steam discharging mechanism.

[0011]

The present invention for achieving the above object includes the following inventions.

(1) A packaging bag whose edges and sides are closed by laminating laminated sheets and heat-sealing the innermost films with each other. A protruding heat seal portion having a corner in the seal zone is formed toward the inside of the packaging bag, and the protruding heat seal having the corner is provided in the interlayer bonding zone between the innermost film and the film layer adjacent thereto. A weak adhesive zone capable of delamination is formed in a region overlapping the seal portion, and a vapor discharge mechanism is formed by the protruding heat seal portion having the corner portion and the weak adhesive zone capable of delamination overlapping therewith. The peelable weak adhesive zone is composed of a weak adhesive area A provided on the outer edge side area of the closed end or side, and a continuous inner area of the packaging bag. A weak adhesive area B provided in the area and overlapping the protruding heat seal part having the corner, wherein the weak adhesive area B has a higher peel strength than the weak adhesive area A. Heating-type sealed packaging bags.

(2) The heat seal zone is provided with a wedge-shaped or tapered non-heat seal portion which is adjacent to the protruding heat seal portion having the corner portion and which cuts into the heat seal zone from the inside of the packaging bag. The heating-capable hermetically sealed packaging bag according to item (1), which is formed.

(3) The weak bonding area B has a peel strength of 100 g.
A weak adhesive area having a peel strength of 10 g to 400 g / 15 mm width, and a weak adhesive area B having a peel strength higher than that of an adjacent weak adhesive area A. (1) or characterized in that it has strength
(2) The heating-type sealed packaging bag according to the item (2).

(4) The weak adhesive area A having the same peeling strength as the weak adhesive area A is further provided on the inner side of the packaging bag from the weak adhesive area B.
The heating-capable sealed packaging bag according to any one of the above items (1) to (3), wherein:

(5) The weak adhesive zone A and / or the weak adhesive zone B are weak adhesive zones formed by discontinuously arranging adhesive layer blocks of a predetermined shape by a pattern printing method. The sealed packaging bag of the type described in any one of the above items (1) to (4).

(6) The peel strength of the weak adhesive zone depends on the shape of the adhesive layer block and / or the total adhesive area occupied by the adhesive layer block in each weak adhesive zone. It is characterized by being set
(5) The sealed packaging bag of the type described in (5).

(7) The vapor discharge mechanism is formed on the center back portion of a packaging bag having a center back portion, wherein the steam discharge mechanism is formed on the center back portion. Item 7. A heat-capable sealed packaging bag according to the item. (8) The steam discharge mechanism is characterized in that the end is formed at one end of a sealing packaging bag having a bifurcated end, any one of (1) to (6). Item 2. The heating-capable sealed packaging bag according to Item 1.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A heat-capable sealed packaging bag of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a basic arrangement of a heat-sealed portion and a non-heat-sealed portion at each end and side including an end having a steam discharge mechanism of a heat-capable sealed packaging bag of the present invention. . FIG.
In the arrangement state of the heat-sealed portion and the non-heat-sealed portion of the innermost layer at the end portion or the like of the packaging bag of FIG. 1 having a vapor discharge mechanism, the weakly-bonded area formed in the innermost-layer film and the interlayer bonding zone overlapping therewith. It is a figure which overlaps A and B and shows the arrangement relationship of both. FIG. 3 is a diagram showing a cross section taken along line XX of FIG. FIG. 4 is a perspective view of a packaging bag having the steam discharge mechanism of FIGS. 1 and 2 at one of the forked ends, and FIG. 5 is a perspective view of a packaging bag having a steam discharge mechanism at the central back portion.

As shown in FIG. 1, the heat-capable sealed packaging bag 1 is obtained by laminating a laminated sheet whose innermost layer is a heat-sealable film capable of being heat-sealed, into two folds. A closed end is formed by heat-sealing the inner layer films at the end 4 and the side portions 3 and 5. The heating-compatible packaging bag 1 is provided at one end 2 (a front end) of the forked end with a steam discharge mechanism for discharging steam generated inside when heated in a microwave oven or the like to the outside. ing.

The heat-sealing zone 8 between the inner layers at the heat-sealing end 2 provided with the steam discharge mechanism has a heat-sealing portion 11 protruding in the inner direction of the packaging bag.
The protruding heat seal portion 11 has a corner 1 at its tip.
It has 0. A tapered or wedge-shaped non-heat-sealing portion 12 is arranged on the side of the protruding heat-sealing portion 11 having the corner portion 10. If the shape of the non-heat-sealing portion 12 is a wedge-shaped or tapered shape converging in the direction shown in the drawing, the non-heat-sealing portion 12 is not heat-sealed when the storage portion expands due to water vapor or the like generated inside the packaging bag. The portion 12 also expands, and stress is concentrated on the tip portion, particularly the corner portion 10 of the heat seal portion 11 protruded by the expansion, and the inner layer is easily broken at this portion, which is preferable.

As shown in FIG. 2, the interlayer bonding zone between the heat-sealable inner layer and the film layer adjacent thereto at the sealing end 2 overlaps with the protruding heat sealing portion 11 formed in the heat sealing zone 8. The area is provided with a peelable weak adhesion zone. When the inner layer is torn at the corner 10 of the heat seal portion 11 where the packaging bag has expanded and protruded, the weak adhesive zone is peeled to such an extent that it is peeled by the pressure of water vapor or the like flowing from the broken portion. A weak bonding area B provided so as to cover the heat sealing edge line 9 indicated by a dotted line in FIG. 2 and an edge of the packaging bag adjacent to the weak bonding area B. The weak adhesive area A is provided in the direction and, in some cases, also in the inner direction of the packaging bag. Further, the peel strength of the weak adhesive area B is set smaller than the peel strength of the weak adhesive area A. The other layers are adhered by a usual method for forming a laminated film.

The layer structure of the steam discharge mechanism is shown by XX in FIG.
FIG. 3 is a sectional view taken along a line. The ends are closed by heat welding the inner layer films 14 to each other. Further, between the inner layer 14 and the outer layer 15, the edge side is bonded in a weak bonding area A having a relatively low peel strength, and a portion of the weak bonding area A near the center of the packaging bag has a peel strength higher than that of the weak bonding area A. Are bonded by a weak bonding area B having a high thickness. The weak adhesive area A is provided near the center of the packaging bag in the weak adhesive area B. 2 and 3 in the packaging bag of the present invention.
As shown in the figure, it is desirable to arrange the weak adhesive area A with the weak adhesive area B interposed therebetween, but the weak adhesive area A on the inner side of the packaging bag may be replaced with an extension of the weak adhesive area B. it can. FIG. 5 shows a packaging bag having a steam discharge mechanism in the central back portion.

[0024]

The above-mentioned heat-capable sealed packaging bag has a housing portion 1
3 is filled with a cooked food (not shown) or the like, and after heat treatment, the filling port is finally heat-sealed to be completely sealed and stored at room temperature or in a frozen state.
When the sealed packaging bag is heated with a microwave oven or the like in a state in which food is stored therein, the packaging bag expands due to expansion of water vapor generated from the stored food or a sealed gas. When water vapor or the like is generated in the packaging bag, the water vapor or the like expands the entire packaging bag 1 and at the same time, the water vapor or the like also enters the wedge-shaped or tapered non-heat-sealing portion 12 in the heat-sealing zone, thereby causing the non-heat-sealing. The part 12 is also inflated. When such expansion inside the packaging bag expands, a peeling force acts on the entire heat seal edge line where the inner layers are connected to each other, but the heat seal portion 1 protrudes.
A concentrated peeling force acts on the tip corner portion 10 in a plurality of directions from 1 and the innermost layer is broken at the corner portion.

If a weak adhesive area A having a lower peel strength than the weak adhesive area B is provided around the weak adhesive area B, the innermost layer near the corner 10 of the heat-seal portion 11 protrudes when the packaging bag is inflated. When the tearing occurs, peeling occurs in the weak bonding area B due to the vapor entering therefrom, and the vapor immediately reaches the weak bonding area A, and the peeling area is sharply reduced in the weak bonding area A in a state where it is more easily peeled. It is quickly discharged outside from the steam discharge port while expanding. As a result, the packaged food can be heated and cooked to a desired degree without bursting.

At this time, if a weak bonding area A having a smaller peel strength than the weak bonding area B is formed on the inner side of the packaging bag than the weak bonding area B, the innermost layer is formed at the corner of the protruding heat seal section 11. The steam which breaks down at the location 10 and invades while peeling off the weak bonding area B easily penetrates into the weak bonding area A on the inner side of the packaging bag, peels off the layers, greatly expands the area, and expands the steam inside the packaging bag. This is preferable because it becomes a storage part and further increases the pressure of the steam forming the steam discharge passage by separating the weak adhesion zone.

FIG. 4 shows an example in which a vapor discharge mechanism is provided with a bottom-side back sticking portion 6 of a packaging bag. In the case of the packaging bag of FIG. 4, the vapor discharge mechanism has a weak adhesive area A on the edge side of the back adhesive section, a weak adhesive area B at the center of the back adhesive section, and a weak adhesive area A on the proximal end side of the back adhesive section. The weak adhesion area A is provided so as to extend toward the center of the packaging bag beyond the base end of the central backing portion. When the packaging bag expands due to the generation of internal steam by heating, the internal steam breaks the innermost layer at the protruding corner portion 10 of the heat seal portion 11 and penetrates into the weak adhesion region B,
In addition to the increased pressure of the steam, the entire weak bonding area B is delaminated, and the expansion continues in the weak bonding area B, and together with the steam continuously intruding from the broken portion of the inner layer, a large pressure is applied to weak bonding. A vapor discharge passage extending to the outside of the packaging bag is formed while exfoliating the area A at a stretch, and is discharged to the outside.

At this time, the provision of the weak adhesive region A adjacent to the inside of the packaging bag of the weak adhesive region B, as described above, serves as a storage portion for the vapor that has entered the portion, and further increases the amount of the increased vapor. The pressure is preferably concentrated as the delamination force of the weakly bonded region A, which contributes to the reliable formation of the steam discharge passage, which is preferable.

[0029]

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

Example 1 Biaxially stretched nylon film [ONy film, 25 μm
m] on one side with respect to the flow direction, from the side edge toward the center, adhesive for weak adhesive area A [“X218PE” manufactured by Toyo Ink Mfg. Co., Ltd.] / adhesive for weak adhesive area B [Dainichi Seika In the gravure printing machine, the order of ethylene-vinyl acetate aqueous part coat agent "Seikadyne 1900W" manufactured by Kogyo Co., Ltd./adhesive for weak adhesion area A [X218PE "manufactured by Toyo Ink Mfg. Co., Ltd." Using ink [Toyo Ink Mfg. Co., Ltd. “X218PE”], three-color printing and printing of the weak adhesive zone in the order of “weak adhesive area A / weak adhesive area B / weak adhesive area A” were performed, and then dry In a laminating machine, a urethane adhesive [Toyo Morton Co., Ltd.]
Manufactured by "Adcoat AD900"] to form a two-layer packaging bag sheet.

Next, the sheet for packaging bag is 460 m wide.
Prepare a roll slit to m and use a high-speed center seal automatic bag making machine (manufactured by Seibu Kikai Kogyo Co., Ltd.) to make the bottom back side width 30 mm, seal temperature 230 ° C., side and bottom seal width. 8 mm, a sealing temperature of 220 ° C., and a line speed of 90 shots / minute were produced to produce a packaging bag for a microwave oven shown in FIG. The peel strength of the weak bonding area A in the weak bonding area of the packaging bag was 20 g / 15 mm width, the weak bonding area B was 500 g / 15 mm width, and the heat sealing strength was 3.0 kg / 15 mm width.

Then, the frozen packaging bag is filled from the unclosed end of the microwave packaging bag manufactured as described above, and the unclosed end is heat-sealed with a width of 10 mm to seal the packaging bag for the microwave oven with the frozen packaging. (Pouch) was manufactured. The pouch containing the frozen menchi cutlet manufactured as described above was placed in a microwave [Mitsubishi Electric Corporation: Model "RO-SE".
2 "], and heat-treated at 600 W for 5 minutes and 30 seconds. After 4 minutes and 30 seconds, the entire pouch swelled, and after 4 minutes and 50 seconds, the steam under pressure was released from the weak adhesion zone of the seal portion, and after 5 minutes and 15 seconds, it became ready to eat.

After cutting off the supply end of the frozen pouch and opening the pouch, taking out the contents and observing the heat seal edge line portion of the bottom-side backing part, the heat seal part shown in FIG. Wedge-shaped non-heat-sealing part 1
2, the unstretched polypropylene inner layer portion of the protruding heat seal portion is torn along the heat seal edge line, and from the torn portion, through the weak adhesion region B-the weak adhesion region A, the steam jetting point at the edge of the back pasting portion It was confirmed that a steam discharge passage leading to was formed. Further, peeling was also observed in the weak adhesive area A inside the weak adhesive area B, and this peeled part became a storage part for the steam that entered from the broken part of the inner layer, and increased the driving force of the steam toward the edge of the backing part. It was presumed to have acted.

Example 2 Biaxially stretched nylon film [ONy film, 25 μm
m], on one side with respect to the flow direction, in the direction from the side edge to the center, an adhesive for weak adhesion area A [ethylene-vinyl acetate aqueous part coat agent “Seikadyne 1900W” manufactured by Dainichi Seika Kogyo Co., Ltd.] / Adhesive for weak bonding area B [Polyester coating agent (glass transition point 2 ° C, softening point 112 ° C, molecular weight 20,000)] / Adhesive for weak bonding area A [ethylene-vinyl acetate based on Dainichi Seika Industry Co., Ltd. Aqueous part coat agent "Seikadyne 1900W"], three-color printing using an ink ["NEWLP Super" manufactured by Toyo Ink Mfg. Co., Ltd.] and "weak adhesion area A / weak adhesion" in a gravure printing machine. In the dry laminating machine, a urethane adhesive (“Adcoat AD900” manufactured by Toyo Morton Co., Ltd.) is printed on the weak adhesive zone in the order of “area B / weak adhesive area A”. Aluminum-deposited film 12μm as the outer layer by using, to form a packaging bag sheet of bonded an unstretched polypropylene film 60μm as the inner layer combined three layers.

Next, a roll obtained by slitting this packaging sheet to a width of 430 mm was prepared, and a bottom-side back-applied portion width of 30 mm was used using a high-speed center seal automatic bag making machine (manufactured by Seibu Kikai Co., Ltd.). Seal temperature 220 ° C, side and bottom seal width 8mm, seal temperature 220 ° C, line speed 90
A bag was made at a shot / minute to produce a packaging bag for a microwave oven shown in FIG. The peel strength of the weak bonding area A in the weak bonding area of the packaging bag was 350 g / 15 mm width, the weak bonding area B was 580 g / 15 mm width, and the heat sealing strength was 4.0 kg / 15 mm width.

Next, a cooked curry is filled from the unclosed end of the microwave packaging bag manufactured as described above, and the unclosed end is heat-sealed with a width of 10 mm.
The mixture was sterilized by heating under pressure for 0 minutes to produce a sealed packaging bag for a microwave oven containing curry. The sealed packaging bag for the microwave oven containing the curry manufactured as described above was microwaved [Mitsubishi Electric Corporation
(RO-SE2)), and heat-treated at 600 W for 3 minutes and 30 seconds. After 2 minutes and 30 seconds, the entire packaging bag was inflated, and after 2 minutes and 50 seconds, the steam under pressure was released from the weak adhesion zone of the seal portion, and after 3 minutes and 15 seconds, it became ready to eat.

After the curry supply end of the pouch was cut off and opened, the contents were taken out, and the heat-sealed edge line portion of the bottom-side back adhesive was observed. As in Example 1, the unstretched polypropylene inner layer was observed. The portion was torn along the heat seal edge line at the corner, and it was confirmed that a steam discharge passage was formed from the torn portion through the weak adhesive area B-the weak adhesive area A to the steam jetting point on the back part. Was done. Also,
Peeling was also observed in the entire weak adhesive area A inside the weak adhesive area B.

Example 3 Biaxially stretched nylon film [ONy film, 25 μm
m], on one side with respect to the flow direction, in the direction from the side edge to the center, an adhesive for weak adhesion area A [ethylene-vinyl acetate aqueous part coat agent “Seikadyne 1900W” manufactured by Dainichi Seika Kogyo Co., Ltd.] / Adhesive for weak bonding area B [Polyester coating agent (glass transition point 2 ° C, softening point 112 ° C, molecular weight 20,000)] / Adhesive for weak bonding area A [ethylene-vinyl acetate based on Dainichi Seika Industry Co., Ltd. Aqueous part coat agent "Seikadyne 1900W"], three-color printing using an ink ["NEWLP Super" manufactured by Toyo Ink Mfg. Co., Ltd.] and "weak adhesion area A / weak adhesion" in a gravure printing machine. In the dry laminating machine, a urethane adhesive (“Adcoat AD900” manufactured by Toyo Morton Co., Ltd.) is printed on the weak adhesive zone in the order of “area B / weak adhesive area A”. Aluminum-deposited film 12μm as the outer layer by using, to form a packaging bag sheet of bonded an unstretched polypropylene film 60μm as the inner layer combined three layers.

Next, a roll obtained by slitting the packaging sheet into a width of 430 mm was prepared, and a central back-sticking part width of 30 mm and a seal were used using a high-speed center seal automatic bag making machine (manufactured by Seibu Kikai Kogyo Co., Ltd.). Temperature 230 ° C, side and bottom seal width 10mm, seal temperature 220 ° C, line speed 90
The bag was made at a shot / minute to produce a packaging bag for a microwave oven having the central back affixed portion shown in FIG. The peel strength of the weak adhesive zone A in the weak adhesive zone of the packaging bag is 500 g / 15 m.
In m width, the weak adhesive area B was 600 g / 15 mm width, and the heat sealing strength was 4.0 kg / 15 mm width.

Next, a cooked curry is filled from the unclosed end of the microwave packaging bag manufactured as described above, and the unclosed end is heat-sealed with a width of 10 mm.
The mixture was sterilized by heating and pressurizing for 0 minutes to produce a sealed packaging bag for a microwave oven containing curry. When the sealed packaging bag for a microwave oven containing curry produced as described above was heat-treated in a microwave oven in the same manner as in Example 2, the entire packaging bag swelled after 2 minutes and 30 seconds, and after 2 minutes and 50 seconds, weak adhesion of the sealing portion was observed. Water vapor under pressure was released from the zone, and it became ready to eat after 3 minutes and 15 seconds.

After the curry supply end of the pouch was cut off and opened, the contents were taken out, and the heat seal edge line portion of the central backing portion was observed. It was confirmed that a steam discharge passage was formed from the breached portion generated at the seal edge line portion to the steam ejection portion of the back pasting portion through the weak adhesive region B-the weak adhesive region A. Peeling was also observed in the entire weak adhesive region A inside the weak adhesive region B.

In the above-described embodiment, the heat and pressure molding method in which an adhesive is applied to the entire surface of each of the weak adhesive zone A and the weak adhesive zone B to form a weak adhesive zone having a predetermined peel strength. Although an example of a mold sealed packaging bag is described, as the two weak adhesive zones, an adhesive is patterned and printed by a printing method so that an adhesive layer block of a predetermined shape is discontinuously arranged in a predetermined pattern. Band. In this case, the peel strength of each of the weak adhesive zones can be set by the shape of the adhesive layer block discontinuously arranged in each weak adhesive zone, the total area of the adhesive layer block in the zone, and the like. A heat-capable sealed packaging bag in which a weak adhesive zone having a predetermined peel strength is formed by forming such a discontinuous pattern of the adhesive layer block by a printing method is also included in the scope of the present invention.

[0043]

As described above, according to the present invention, it is possible to smoothly discharge the water vapor and the like inside the packaging bag generated during the heat treatment in a microwave oven or the like to the outside of the packaging bag, A heat-resistant sealed packaging bag which does not break during handling such as transportation of a packaging bag product in which the packaging bag is sealed is provided.

[Brief description of the drawings]

FIG. 1 is a plan view showing a basic arrangement of a heat seal portion and a non-heat seal portion in a steam discharge mechanism of a heat-capable sealed packaging bag.

FIG. 2 is a view showing a weak adhesion region A between a heat-sealed portion between innermost layers and a non-heat-sealed portion and an interlayer adhesion zone in a steam discharge mechanism.
And FIG.

FIG. 3 is a view showing a cross section taken along line XX of FIG. 2;

FIG. 4 is a perspective view showing a steam discharge mechanism on a bottom-side back attachment portion.

FIG. 5 is a perspective view showing a steam discharge mechanism on a central back portion.

FIG. 6 is a perspective view of a conventional heat-capable sealed packaging bag with a steam discharge mechanism.

7 is a perspective view of a conventional heat-capable sealed packaging bag different from FIG.

FIG. 8 is a perspective view of a conventional heating-capable sealed packaging bag different from FIGS. 6 and 7.

[Explanation of symbols]

 1: Heating type packaging bag 2: Heat seal end with steam discharge mechanism 3, 5: Packaging bag side 4: Packaging bag end 6: Back apposition 7: Bottom side end 8: Heat seal zone 9: Heat Seal edge line 10: Corner 11: Projecting part 12: Non-heat-sealing zone 13: Housing part 14: Inner layer 15: Outer layer 101: End of packaging sheet 102: Housing part 103: Back part 104: First passage 105: First 2 passage 111: wrapping sheet 112: back sticking part 113, 119: re-peeling part 114: bag body 115, 116: steam discharge port 117, 118: steam guide passage 120: action bar 121, 122: projecting part 123, 124: Vice room

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Tetsuya Shiraishi 39, 1646 Nasugagawa, Nakatsugawa City, Gifu Prefecture Inside Ace Package Company (72) Inventor Tohru Ikeda 1-1, Suzukicho, Kawasaki-ku, Kawasaki-ku, Kanagawa Prefecture Ajinomoto Stock F-term in the company's production technology development center (reference) 3E064 AA05 AA08 BA21 HD03 HE02 HN06 3E067 AA11 AB01 BA12A BB14A CA24 EA04 EA06 EA11 EB22 EE48 FA01 FC01 GD08

Claims (5)

[Claims] 1. A packaging bag having an end and a side closed by laminating laminated sheets and heat-sealing the innermost films, wherein at least one end or side is heat-sealed. A protruding heat seal portion having a corner portion in the zone is formed toward the inside of the packaging bag, and the protruding heat seal portion having the corner portion is formed in the interlayer bonding zone between the innermost film and the film layer adjacent thereto. A weak adhesive zone capable of delamination is formed in a region overlapping with the portion, and a steam discharge mechanism is formed by the protruding heat seal portion having the corner portion and the weak adhesive zone capable of delamination overlapping therewith. The peelable weak adhesive zone comprises a weak adhesive area A provided on the outer edge side area of the closed end or side, and a continuous inner area of the packaging bag. And a weak adhesive region B overlapping the protruding heat seal portion having the corner portion, wherein the weak adhesive region B has a higher peel strength than the weak adhesive region A. Heatable sealed packaging bag. 2. A wedge-shaped or tapered non-heat-sealed portion is formed in the heat-seal zone adjacent to the protruding heat-seal portion having the corner portion, which bites into the heat-seal zone from the inside of the packaging bag. The heating-capable hermetically sealed packaging bag according to claim 1, wherein 3. The weak adhesive area B has a peel strength of 100 g.
A weak adhesive area having a peel strength of 10 g to 400 g / 15 mm width, and a weak adhesive area B having a peel strength higher than that of an adjacent weak adhesive area A. The heat-resistant sealed packaging bag according to claim 1, wherein the sealed packaging bag has strength. 4. The weak bonding area A having a peel strength similar to that of the weak bonding area A is further provided on the inner side of the packaging bag with respect to the weak bonding area B. The heating-capable sealed packaging bag according to any one of claims 1 to 7. 5. The heating device according to claim 1, wherein the steam discharging mechanism is formed on the central back portion of the packaging bag having the central back portion. Corresponding sealed packaging bag.