JP4346232B2 - Heat-resistant sealed packaging bag - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hermetically sealed bag that can be used for heating such as microwave oven heat treatment in which cooked items such as Chinese cooking utensils and curry can be cooked in a microwave oven.
[0002]
[Prior art]
Generally, packaging products containing cooked items that generate steam when heated, such as Chinese cooking utensils, may burst due to internal pressure when a microwave oven is used. . In addition, when cooking in a microwave oven, it is necessary to let the steam escape without leaking. Conventionally, a check valve is attached to the package, or a portion of the package is cut with a scissors immediately before cooking. I was doing.
However, when the above-described check valve is employed, there is a problem that it is functionally incomplete or high in cost, and has not been generally used. There was also a risk of boiling and spilling.
[0003]
Therefore, a packaging bag as shown in FIG. 6 has also been proposed. This packaging bag is manufactured by folding the laminated sheet 101, heat-welding the inner surfaces of both end portions 101 and the back pasting portion 103, and forming the accommodating portion 102 for accommodating the food to be cooked inside. Yes, in the back pasting portion 103, the first passage 104 and the second passage 105 are formed as regions where the inner surfaces of the packaging sheets are not thermally welded. Such a packaging bag opens the end of the second passage 105 by excision or the like, and discharges steam generated by heating to the outside through the first passage 104 and the second passage 105, and uses a microwave oven. Thus, the item to be cooked can be heated.
However, in such a packaging bag, when the food to be cooked is sterilized by heating after packaging the food to be cooked, not only steam but also the food to be cooked may enter the first passage 104 and the second passage 105. In the final product, there is a problem in that moisture condensed by steam, cooked products, and the like exist in the passage, which may impair the beauty.
[0004]
Accordingly, the present inventors have solved such problems, efficiently discharged steam generated while preventing leakage of cooked items during cooking in a microwave oven, and obtained commercial value through sterilization treatment, etc. A microwave oven packaging body and a microwave oven packaging bag that have not been lowered have been proposed (Japanese Patent Laid-Open Nos. 10-310181 and 11-278558).
[0005]
Representative examples of these microwave oven packaging bags are shown in FIG.
In FIG. 7, a single laminated sheet 111 having a heat-welding film as an inner layer is folded so that a back pasting portion 112 is formed as shown in the drawing so that the inner layers face each other, and the inner layers are folded to the back pasting portion and both ends. The end portion or the like is sealed by heat welding at the portion, and the back pasting portion 112 is arranged in a lying state as shown in the figure, and between the outer film and the inner film of one packaging sheet 111 constituting the upper surface in the lying state. A re-peeling portion 113 (a portion within a dotted line) formed of a weakly bonded portion is formed in the bonded region. 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, and steam flows between the outer film and the inner film from the tear opening of the inner film. Then, a vapor passage is formed while peeling between the outer film and the inner film and discharged to the outside.
[0006]
Moreover, FIG. 8 shows what improved about the mechanism which discharges the vapor | steam provided in the center back sticking part of the packaging bag for microwave ovens shown in FIG. 7, and a breaking opening is always enough size. In addition, it is possible to avoid the expansion of the packaging bag while the back sticking portion is bent, so that the steam passage is not blocked, and the steam can be discharged efficiently. And in the re-peeling part 113 (area | region enclosed with the dotted line) formed by making between the outer layer film of the packaging sheet 111 located in the outer side of the back sticking part 112, and an inner layer film into a weak adhesive zone, it is an outer layer film. And a plurality of steam outlets 115 and 116 for discharging steam passing between the inner layer film and the inner layer film, and a steam guide passage formed in a re-peeling portion for guiding the steam to each of these steam outlets 117 and 118 are formed.
[0007]
Further, in the zone where the inner layer films of the packaging sheet of the back sticking portion corresponding to the positions of the steam guide passages 117 and 118 are thermally welded, the action bar 120 and at least one end of the action bar portion are provided. The inner layer film breaking tips (protruding) portions 121 and 122 are formed integrally with the portion and projecting toward the base end side (inside the packaging bag) of the back sticking portion. A wedge-shaped or tapered-shaped band that is wide on the proximal end side of the back sticking portion adjacent to the distal end portion and converges from there to the free end side, and is not a heat-sealed band. As the sub-chambers 123 and 124 have the action of causing the internal steam to invade and the back sticking part to rise when the gas expands. Then, when the packaging bag is heated and expanded, a rupture portion is generated in the inner layer portion in contact with the protruding rupturing tip portions 121 and 122.
[0008]
[Problems to be solved by the invention]
The microwave packaging bag shown in FIG. 7 and FIG. 8 has a steam discharge mechanism that extends from the storage part of the cooked product and the central part of the storage part so that steam can be discharged to the outside when the microwave oven is heated. It consists of a provided back pasting part. In this packaging bag, in the state where the product to be cooked is housed in the housing portion, the housing portion spreads and the central back pasting portion rises, so that steam can be reliably discharged from the back pasting portion. However, if the central back sticking part is projected from the packaging bag main body, for example, when displaying on the store shelves, the central back sticking part touches the fingers and gets in the way, or stacks neatly on the shelves. For reasons such as being unable to be displayed, after the food to be cooked is contained in a bag and sealed, the whole product is further packaged and the central back-pasted part is often folded and supplied to the market. The need for such an exterior material has the disadvantage of increasing the packaging cost.
Moreover, although rare, when a product is taken out from the exterior material, if the bend crease and the center back sticking part lie down without standing up, it may interfere with steam escape.
[0009]
In order to eliminate the overhang of the center back sticking part, instead of providing a steam discharge mechanism at the center back sticking part of the bag, providing an easy-to-handle microwave packaging bag without overhanging by providing it at one end of the bag, for example, the bottom. can do. However, when filling a solid food by dropping it from a certain height using a continuous filling and packaging machine, if the food to be cooked is a solid food with a heavy weight like a cutlet, a steam discharge provided at the bottom by collision Damage to the mechanism may result in insufficient steam escape, and cracks may occur, causing liquid leakage of products filled with liquid seasonings such as sauce and dashi juice. Encounter new problems.
[0010]
The present invention solves the above problems, is easy to handle, and does not affect the portion provided with the steam discharge mechanism even when heavy solid food is dropped and filled using a filling and packaging machine. It is an object of the present invention to provide a sealed packaging bag for a microwave oven that can be filled into a bag and that can reliably and efficiently discharge steam from a portion provided with a steam discharge mechanism.
[0011]
[Means for Solving the Problems]
The present invention for achieving the above object includes the following inventions.
[0012]
(1) A packaging bag in which an end portion and a side portion are closed by superposing laminated sheets and heat-sealing innermost layer films, and at least one end portion or side portion has a heat seal zone. A projecting heat seal portion having a corner portion is formed toward the inside of the packaging bag, and a projecting heat seal portion having the corner portion in an interlayer adhesion zone between the innermost layer film and the film layer adjacent thereto. A weak adhesion zone capable of delamination is formed in the overlapping region, and a vapor discharge mechanism is formed by the heat-sealed portion having a protruding shape having the corners and the weak adhesion zone capable of delamination overlapping therewith, The peelable weak adhesion zone is provided in the weak adhesion area A provided in the outer edge side area of the closed end or side part, and continuously in the packaging bag inner side area. And has a weak adhesion area B overlapping the protruding heat seal part having the corners, and the weak adhesion area B has higher peel strength than the weak adhesion area A. Mold sealed packaging bag.
[0013]
(2) The heat seal zone is adjacent to the protruding heat seal portion having the corners, and a wedge-type or taper-type non-heat seal portion that bites into the heat seal zone from the inside of the packaging bag is formed. The heat-resistant sealed packaging bag according to item (1), wherein
[0014]
(3) The weak adhesion area B is a weak adhesion area having a peel strength of 100 g to 600 g / 15 mm width, and the weak adhesion area A is a weak adhesion area having a peel strength of 10 g to 400 g / 15 mm width, and weak. The heat-resistant sealed packaging bag according to (1) or (2), wherein the adhesive region B has higher peel strength than the adjacent weak adhesive region A.
[0015]
(4) Item (1) to (3), characterized in that a weak adhesion area A having a peel strength similar to that of the weak adhesion area A is further provided inside the packaging bag inside the weak adhesion area B. The heating-compatible sealed packaging bag according to any one of the items.
[0016]
(5) The weak adhesive zone A and / or the weak adhesive zone B is a weak adhesive zone formed by discontinuously disposing an adhesive layer block having a predetermined shape by a pattern printing method ( 1) The sealed packaging bag for heat and pressure molding according to any one of items 1 to 4.
[0017]
(6) The peel strength of the weak adhesive zone is determined by the shape of the adhesive layer block and / or the total adhesive area occupied by the adhesive layer block in each weak adhesive zone, etc. The sealed packaging bag for heat and pressure molding according to item (5).
[0018]
(7) The vapor discharge mechanism is formed in the central back pasting portion of a packaging bag having a central back pasting portion, according to any one of (1) to (6) Heat-resistant sealed packaging bag.
(8) The steam discharge mechanism is formed at one end portion of a sealing packaging bag having an end portion formed in a bifurcated shape, and any one of the items (1) to (6) 2. A heat-resistant sealed packaging bag according to item 1.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
The heat-compatible 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 state of a heat seal part and a non-heat seal part in each end part and side part including an end part having a steam discharge mechanism of a heat-compatible sealed packaging bag of the present invention. . 2 is formed in the innermost layer film and the interlayer adhesive zone overlapping with the innermost layer film in the arrangement state of the heat seal portion and the non-heat seal portion between the innermost layers in the end portion or the like having the steam discharge mechanism of the packaging bag of FIG. It is a figure which shows the arrangement | positioning relationship of both by overlapping the weak adhesion areas A and B which are present. 3 is a cross-sectional view taken along line XX in FIG. 4 is a perspective view of a packaging bag having the vapor discharge mechanism of FIGS. 1 and 2 on one of the bifurcated ends, and FIG. 5 is a perspective view of the packaging bag having a vapor discharge mechanism at the central back sticking portion.
[0020]
As shown in FIG. 1, the heat-resistant hermetic packaging bag 1 has a bifurcated end portion (2), an end portion 4 and a laminated sheet in which the innermost layer is a heat-weldable film that can be heat-sealed. And the closed end part is formed by heat-sealing inner-layer films in the side parts 3 and 5. FIG. This heating-compatible packaging bag 1 is provided with a steam discharge mechanism that discharges steam generated inside when heated in a microwave oven or the like at one end 2 (front end) of the bifurcated end. ing.
[0021]
The heat-seal zone 8 between the inner layers in the heat-seal end 2 provided with the steam discharge mechanism has a heat-seal part 11 projecting toward the inside of the packaging bag, and the projecting heat-seal part 11 has its tip. It has a corner 10 in the part. Further, a taper type or wedge type non-heat seal part 12 is disposed on the side of the protruding heat seal part 11 having the corner part 10. If the shape of the non-heat seal portion 12 is a wedge shape or a taper shape converging in the direction shown in the drawing, the non-heat seal portion 12 is expanded when the container portion expands due to water vapor generated inside the packaging bag. The portion 12 also expands, and stress concentrates on the tip portion of the heat seal portion 11 that protrudes due to the expansion, in particular, the corner portion 10, and the inner layer is easily broken at the portion, which is preferable.
[0022]
As shown in FIG. 2, the interlayer adhesive zone between the heat-weldable inner layer and the film layer adjacent thereto at the sealed end portion 2 is peeled off in a region overlapping the protruding heat seal portion 11 formed in the heat seal zone 8. Possible weak bond zones are provided. And this weak adhesion zone is peeled to such an extent that when the inner layer is torn at the corner portion 10 of the heat seal portion 11 that has protruded due to the expansion of the packaging bag, it is peeled off by the pressure of water vapor or the like flowing from the torn portion. 2. Adhesive zone having strength, weakly bonded area B provided so as to cover heat seal edge line 9 indicated by a dotted line in FIG. 2, and edge of packaging bag adjacent to weakly bonded area B It consists of a weak adhesion area A which is also provided in the direction and possibly also in the inner direction of the packaging bag. And the peeling strength of the weak adhesion area B is set smaller than the peeling strength of the weak adhesion area A. The other layers are bonded together by a normal method for forming a laminated film.
[0023]
The layer structure of the steam discharge mechanism is shown in FIG. 3 which is a cross-sectional view taken along the line XX of FIG. The end portions are closed by thermally welding the inner layer films 14 to each other. Moreover, between the inner layer 14 and the outer layer 15, the edge side is adhere | attached in the weak adhesion area A with comparatively low peeling strength, and the part near a packaging bag center of the weak adhesion area A has peeling strength rather than the weak adhesion area A. Bonded by a high weak adhesion region B. Near the center of the packaging bag of the weak adhesion area B, the same weak adhesion area A as the weak adhesion area A is provided. In the packaging bag of the present invention, as shown in FIG. 2 and FIG. 3, it is desirable to arrange the weak adhesion area A with the weak adhesion area B interposed therebetween, but the weak adhesion area A portion inside the packaging bag is Further, it can be replaced with an extended portion of the weak adhesion region B. FIG. 5 shows a packaging bag having a steam discharge mechanism in the central back sticking part.
[0024]
[Action]
The above-mentioned heat-resistant sealed packaging bag is completely sealed by filling the container 13 with heat-cooked food (not shown) and the like, heat-treating, and finally heat-sealing the filling port. Or it is stored in a frozen state.
When this sealed packaging bag is heated with a microwave oven or the like with food stored therein, the packaging bag expands due to the expansion of water vapor generated from the stored food or the 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 enters the wedge-shaped or tapered non-heat seal portion 12 of the heat seal zone. Part 12 is also inflated. When the expansion inside the packaging bag spreads, a peeling force acts on the entire heat seal edge line where the inner layers are bonded to each other, but the tip corner portion 10 of the protruding heat seal portion 11 is concentrated from a plurality of directions. As a result, an appropriate peeling force is applied, and the innermost layer is torn at the corner.
[0025]
And if the weak adhesion area A whose peel strength is lower than that is provided around the weak adhesion area B, the innermost layer is torn in the vicinity of the corner 10 of the protruding heat seal part 11 when the packaging bag is inflated. When it occurs, the weak adhesion area B is peeled off by the vapor entering from the steam, and the steam immediately reaches the weak adhesion area A, and the vapor is rapidly expanded in the weak adhesion area A in a state where it is more easily peeled. It is quickly discharged outside from the discharge port. As a result, the packaged food can be cooked to the desired level without rupturing.
[0026]
At this time, when the weak adhesion area A having a lower peel strength than the weak adhesion area B is formed on the inner side of the packaging bag from the weak adhesion area B, the innermost layer protrudes from the corner portion 10 of the heat seal part 11. That breaks down and peels off the weakly bonded area B and easily penetrates into the weakly bonded area A on the inside of the packaging bag, delaminates the layer, and greatly expands the area to become a packaging bag internal vapor reservoir. It is preferable because the pressure of the steam that peels off the weak adhesion zone and forms the steam discharge passage is further increased.
[0027]
FIG. 4 shows an example in which a steam discharge mechanism is provided with a bottom side back pasting portion 6 of a packaging bag. In the case of the packaging bag of FIG. 4, the vapor discharge mechanism has a weak adhesion area A on the back-pasting part edge side, a weak adhesion area B in the center of the back-pasting part, and a weak adhesion area A on the back-pasting part base end side. The weak adhesion area A is provided so as to extend in the center direction of the packaging bag beyond the base end portion of the central back pasting portion. In this packaging bag, when the packaging bag expands due to the generation of internal steam by heating, the internal steam breaks the innermost layer at the corner portion 10 of the protruding heat seal part 11 and enters the weak adhesion region B, and further increases. The entire weak adhesion region B is delaminated by the pressure of the steam to be generated, and also expands in the weak adhesion region B, and becomes a large pressure together with the steam that continuously enters from the inner layer breakage portion to form a weak adhesion region A. A vapor discharge passage leading to the outside of the packaging bag is formed while being peeled off at once, and is discharged to the outside.
[0028]
At this time, providing the weak adhesion region A adjacent to the inside of the packaging bag of the weak adhesion region B functions as a reservoir for the vapor that the portion has intruded, and further increases the pressure of the vapor. This is preferable because it concentrates as the delamination force in the weak adhesion area A and contributes to the reliable formation of the vapor discharge passage.
[0029]
【Example】
EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to the thing of these Examples.
[0030]
Example 1
Biaxially stretched nylon film [ONy film, 25 μm] on one side with respect to the flow direction, from the side edge to the central direction, adhesive for weak adhesion area A [“X218PE” manufactured by Toyo Ink Manufacturing Co., Ltd.] / Weak adhesion Area B Adhesive [Daiichi Seika Kogyo Co., Ltd. Ethylene-Vinyl Acetate Aqueous Part Coat “Seikadyne 1900W”] / Weak Adhesive Area A Adhesive [Toyo Ink Mfg. Co., Ltd. “X218PE”] In the gravure printing machine, using the ink [“X218PE” manufactured by Toyo Ink Manufacturing Co., Ltd.], the order of the three-color printing and “weak adhesion area A / weak adhesion area B / weak adhesion area A” is weak. The adhesive band is printed, and then, in a dry laminating machine, an unstretched polypropylene film of 50 μm is used on the printed surface using a urethane adhesive (“ADCOAT AD900” manufactured by Toyo Morton Co., Ltd.). Was laminated to form a two-layer packaging bag sheet.
[0031]
Next, a roll obtained by slitting the sheet for packaging bag into a width of 460 mm is prepared, and using a high-speed center seal automatic bag making machine (manufactured by Seibu Kikai Kogyo Co., Ltd.), the bottom side back pasting part width is 30 mm, the seal Bags were produced at a temperature of 230 ° C., a side and bottom seal width of 8 mm, a seal temperature of 220 ° C., and a line speed of 90 shots / minute to produce a microwave packaging bag shown in FIG.
The peel strength of the weak adhesion area A in the weak adhesion bond zone of the packaging bag was 20 g / 15 mm width, the weak adhesion area B was 500 g / 15 mm width, and the heat seal strength was 3.0 kg / 15 mm width.
[0032]
Next, the frozen packaging cutlet is filled from the unclosed end portion of the microwave packaging bag manufactured as described above, and the unclosed end portion is heat-sealed with a width of 10 mm, and the sealed packaging bag for the microwave oven containing frozen frozen cutlet (pouch) Manufactured.
The frozen pouch with frozen cutlet made as described above was put into a microwave oven [Mitsubishi Electric Co., Ltd .: Model “RO-SE2”], set to 600 W, and heat-treated for 5 minutes 30 seconds. After 4 minutes and 30 seconds, the entire pouch swelled, and after 4 minutes and 50 seconds, the water vapor in a state where pressure was applied was released from the weak adhesion zone of the seal portion, and after 5 minutes and 15 seconds, it became ready to eat.
[0033]
After cutting and unsealing the frozen pouch cut end of the pouch, taking out the contents, and observing the heat seal edge line portion of the bottom side back-pasted portion, the wedge-shaped non-stick in the heat seal portion shown in FIG. The unstretched polypropylene inner layer portion of the protruding heat seal portion in contact with the heat seal portion 12 is torn along the heat seal edge line, and the edge of the back-pasted portion edge passes through the weak adhesion region B-weak adhesion region A from the torn portion. It was confirmed that a steam discharge passage leading to the steam ejection point was formed. In addition, peeling is also observed in the weak adhesion area A inside the weak adhesion area B, and this peeling location becomes a storage portion of the vapor that has entered from the torn location of the inner layer, and increases the propulsive force of steam toward the edge of the back pasting portion It was inferred that it worked.
[0034]
Example 2
On one side of the biaxially stretched nylon film [ONy film, 25 μm] in the flow direction, from the side edge to the center, an adhesive for weak adhesion area A [Ethylene-vinyl acetate aqueous solution manufactured by Dainichi Seika Kogyo Co., Ltd. Part coat agent “Seikadine 1900W”] / Adhesive for weak adhesive zone B [Polyester coating agent (glass transition point 2 ° C., softening point 112 ° C., molecular weight 20000)] / Adhesive for weak adhesive zone A [Daichi Seika Kogyo Three-color printing using ink ("NEWLP Super" manufactured by Toyo Ink Mfg. Co., Ltd.) in a gravure printing machine so that the order of ethylene-vinyl acetate aqueous part coat agent "Seikadine 1900W" manufactured by Co., Ltd. And “Weak Adhesion Area A / Weak Adhesion Area B / Weak Adhesion Area A” in the order of weak adhesive zones, and then in a dry laminating machine, urethane adhesive on the printed surface Aluminum-deposited film 12μm as the outer layer using a Toyo Morton Co., Ltd., "Adcoat AD900"] to form a packaging bag sheet of bonded an unstretched polypropylene film 60μm as the inner layer combined three layers.
[0035]
Next, a roll slitting this packaging sheet to a width of 430 mm is prepared, and using a high-speed center seal automatic bag making machine (manufactured by Seibu Kikai Kogyo Co., Ltd.), the bottom side back pasting part width is 30 mm, and the seal temperature is 220. A bag for microwave oven shown in FIG. 4 was produced by making bags at a temperature of 8 ° C., a side and bottom seal width of 8 mm, a seal temperature of 220 ° C., and a line speed of 90 shots / minute.
The peel strength of the weak adhesion area A in the weak adhesion band of the packaging bag was 350 g / 15 mm width, the weak adhesion area B was 580 g / 15 mm width, and the heat seal strength was 4.0 kg / 15 mm width.
[0036]
Next, the cooked curry is filled from the unclosed end of the microwave packaging bag manufactured as described above, the unclosed end is heat-sealed with a width of 10 mm, and heat sterilization is performed at 120 ° C. for 30 minutes. A sealed packaging bag for a microwave oven with curry was manufactured.
The sealed packaging bag for curry-containing microwave oven produced as described above was put into a microwave oven [Mitsubishi Electric Co., Ltd .: Model “RO-SE2”], set to 600 W, and heat-treated for 3 minutes 30 seconds. After 2 minutes and 30 seconds, the entire packaging bag swelled, and after 2 minutes and 50 seconds, the water vapor in a state where pressure was applied was released from the weak adhesion zone of the seal portion, and after 3 minutes and 15 seconds, it became ready to eat.
[0037]
After cutting and opening the curry supply end of the pouch, taking out the contents, and observing the heat-seal edge line portion of the bottom side back-pasted portion, the unstretched polypropylene inner layer portion is square as in the case of Example 1. It was confirmed that a steam discharge passage was formed along the heat seal edge line of the part, and from the torn part to the steam ejection part of the back-pasted part through the weak adhesion area B-weak adhesion area A. Further, peeling was also observed in the entire area of the weak adhesion area A inside the weak adhesion area B.
[0038]
Example 3
On one side of the biaxially stretched nylon film [ONy film, 25 μm] in the flow direction, from the side edge to the center, an adhesive for weak adhesion area A [Ethylene-vinyl acetate aqueous solution manufactured by Dainichi Seika Kogyo Co., Ltd. Part coat agent “Seikadine 1900W”] / Adhesive for weak adhesive zone B [Polyester coating agent (glass transition point 2 ° C., softening point 112 ° C., molecular weight 20000)] / Adhesive for weak adhesive zone A [Daichi Seika Kogyo Three-color printing using ink ("NEWLP Super" manufactured by Toyo Ink Mfg. Co., Ltd.) in a gravure printing machine so that the order of ethylene-vinyl acetate aqueous part coat agent "Seikadine 1900W" manufactured by Co., Ltd. And “Weak Adhesion Area A / Weak Adhesion Area B / Weak Adhesion Area A” in the order of weak adhesive zones, and then in a dry laminating machine, urethane adhesive on the printed surface Aluminum-deposited film 12μm as the outer layer using a Toyo Morton Co., Ltd., "Adcoat AD900"] to form a packaging bag sheet of bonded an unstretched polypropylene film 60μm as the inner layer combined three layers.
[0039]
Next, a roll of this packaging sheet slit to a width of 430 mm is prepared, and a high-speed center seal automatic bag making machine (manufactured by Seibu Kikai Kogyo Co., Ltd.) is used. The side and bottom seal width was 10 mm, the seal temperature was 220 ° C., and the line speed was 90 shots / minute to produce a packaging bag for a microwave oven having the central back pasting portion of FIG.
The peel strength of the weak adhesion area A in the weak adhesion band of the packaging bag was 500 g / 15 mm width, the weak adhesion area B was 600 g / 15 mm width, and the heat seal strength was 4.0 kg / 15 mm width.
[0040]
Next, the cooked curry is filled from the unclosed end of the microwave packaging bag manufactured as described above, the unclosed end is heat-sealed with a width of 10 mm, and sterilized by heating and pressure at 120 ° C. for 30 minutes. A sealed packaging bag for a microwave oven with curry was manufactured.
When the sealed packaging bag for curry-containing microwave oven produced as described above was heat-treated in the microwave oven in the same manner as in Example 2, the entire packaging bag swelled after 2 minutes and 30 seconds and weakly adhered to the seal portion after 2 minutes and 50 seconds. Water vapor was released from the zone under pressure, and after 3 minutes and 15 seconds, it was ready to eat.
[0041]
After cutting and opening the curry supply end of the pouch, taking out the contents, and observing the heat-seal edge line part of the center-side back-pasted part, the heat-seal edge line of the inner layer part as in Example 2 It was confirmed that a steam discharge passage was formed from the tearing point generated in the part to weak steaming region B-weak bonding region A to the steam jetting point of the back pasting part. In addition, peeling was observed in the entire weak adhesion area A inside the weak adhesion area B.
[0042]
In the above embodiment, the heat and pressure molding compatible type seal in which a weak adhesive zone having a predetermined peel strength is formed by applying an adhesive to the entire surface of each of the weak adhesive zone A and the weak adhesive zone B. Although an example of a packaging bag has been described, both weak adhesive zones include a zone in which an adhesive layer pattern is printed by a printing method so that adhesive layer blocks of a predetermined shape are discontinuously arranged in a predetermined pattern; You can also In this case, the peel strength of each weak adhesive zone can be set by the shape of the adhesive layer block discontinuously disposed in each weak adhesive zone, the total area of the adhesive layer block in the zone, or the like. Heat-resistant hermetic packaging bags 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 are also included in the scope of the present invention.
[0043]
【The invention's effect】
As described above, according to the present invention, it is possible to smoothly release water vapor or 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, and to package the food or the like in a sealed manner Provided is a heat-compatible sealed packaging bag in which bag breakage does not occur during handling such as transportation of bag products.
[Brief description of the drawings]
FIG. 1 is a plan view showing a basic arrangement state of a heat seal part and a non-heat seal part in a steam discharge mechanism of a heat-compatible sealed packaging bag.
FIG. 2 is a diagram showing an arrangement relationship between heat seal portions and non-heat seal portions between innermost layers and weak adhesion areas A and B in an interlayer adhesion zone in a steam discharge mechanism.
3 is a cross-sectional view taken along line XX of FIG.
FIG. 4 is a perspective view showing a steam discharge mechanism at a bottom side back pasting portion.
FIG. 5 is a perspective view showing a steam discharge mechanism at a central back sticking portion.
FIG. 6 is a perspective view of a conventional heat-resistant sealed packaging bag with a vapor discharge mechanism.
7 is a perspective view of a conventional heat-compatible sealed packaging bag different from FIG. 6. FIG.
FIG. 8 is a perspective view of a conventional heat-compatible sealed packaging bag different from FIGS. 6 and 7;
[Explanation of symbols]
1: Heatable packaging bag
2: Heat seal end with steam discharge mechanism
3, 5: Side of packaging bag
4: End of packaging bag
6: Back pasting part
7: Bottom side end
8: Heat seal zone
9: Heat seal edge line
10: Corner
11: Projection
12: Non-heat seal zone
13: Housing part
14: Inner layer
15: Outer layer
101: End of packaging sheet
102: Housing part
103: Back pasting part
104: First passage
105: Second passage
111: Packaging sheet
112: Back pasting part
113,119: Re-peeling part
114: Bag body
115, 116: Steam outlet
117, 118: Steam guide passage
120: Action bar
121, 122: protrusion
123, 124: Subchamber

Claims (5)

It is a packaging bag in which the end portion and the side portion are closed by overlapping the laminated sheets and heat-sealing the innermost layer films, and at least one end portion or side portion has a corner portion in the heat-seal zone. A projecting heat seal part is formed in the direction toward the inside of the packaging bag, and an interlayer adhesion zone between the innermost film and the film layer adjacent thereto is in a region overlapping the projecting heat seal part having the corners. A weak adhesion zone that can be delaminated is formed, and a vapor discharge mechanism is formed by the protruding heat seal portion having the corners and the weak adhesion zone that can be delaminated, which overlaps the heat seal portion. The weak adhesion zone is provided in the weak adhesion area A provided in the outer edge side area of the closed end or side part, and in the packaging bag inner side area continuously therewith. And a weak adhesion area B overlapping the protruding heat seal part having the corners, and the weak adhesion area B has higher peel strength than the weak adhesion area A. Sealed packaging bag. The heat seal zone is adjacent to the protruding heat seal portion having the corners, and a wedge-type or taper-type non-heat seal portion that bites into the heat seal zone from the inside of the packaging bag is formed. The heat-resistant sealed packaging bag according to claim 1, wherein The weak adhesion area B is a weak adhesion area with a peel strength of 100 g to 600 g / 15 mm width, and the weak adhesion area A is a weak adhesion area with a peel strength of 10 g to 400 g / 15 mm width, and a weak adhesion area. The heat-resistant sealed packaging bag according to claim 1, wherein B has a peel strength higher than that of the adjacent weak adhesion area A. The weak adhesion area A which has the same peeling strength as the said weak adhesion area A is further provided in the packaging bag inside side of the said weak adhesion area B, The any one of Claims 1-3 characterized by the above-mentioned. Heat-resistant sealed packaging bag as described. The said steam discharge mechanism is formed in this center back sticking part of the packaging bag which has a center back sticking part, The heat-response type sealing packaging bag of any one of Claims 1-4 characterized by the above-mentioned. .

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