JP2017190177A - Packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag capable of discharging steam to the outside while preventing blowout due to inner pressure rise of the packaging bag when cooking, in the food packaging bag enabling cooking by high-frequency waves using a microwave oven, and capable of preventing a content after cooking from oozing out to the outside and from dripping to a dining table or a floor.SOLUTION: A packaging bag which enables cooking a content using high-frequency waves by a microwave oven is such that: the packaging bag has a rectangular shape made by heat-sealing a three-side or four-side peripheral edge part; there is provided in a trunk at one side of the packaging bag, a fin made by providing a gusset and heat-sealing both side parts; and the fin has a fragile site which can discharge steam to the outside owing to inner pressure rise by steam in cooking.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a packaging bag. In particular, the present invention relates to a packaging bag that can be heated using a microwave oven, and can be suitably cooked by heating without opening the packaging bag.

  Traditionally, food in a packaging bag that can be cooked or semi-cooked in a packaging bag that can be stored at room temperature, low temperature, or frozen, and can be cooked by heating in a microwave oven without opening. However, it is known as a retort food.

  When the packaging bag is heated in a microwave oven without opening, the moisture in the packaging container becomes water vapor and fills the inside of the packaging bag, increasing the volume. Therefore, if there is no gap through which water vapor can escape, there is a risk of rupture.

  On the other hand, when the contents are in a semi-cooked state, not only heating but steaming with the generated steam may be required. In this case, it is necessary to appropriately design a mechanism for discharging steam to the outside of the packaging bag.

  In an attempt to solve this problem, Patent Document 1 provides a fragile portion in a part of a packaging bag, and can seal the contents as a packaging bag before heating by a microwave oven. A technique is disclosed in which, due to an increase in internal pressure, water vapor can be appropriately discharged from a fragile portion provided in a part of the packaging bag, and rupture of the packaging bag can be prevented.

  However, in actual cooking, when heating and cooking are completed, the packaging bag is taken out from the microwave oven and cooled by the outside air, so that the once expanded packaging bag contracts and the fragile part comes into contact with the contents. There is a possibility that a part leaks to the outside and adheres to the surface of the packaging bag, and improvement has been demanded.

  In addition, the leaked contents may spill or drop on the table or floor when the packaging bag is taken out or transferred to tableware.

Japanese Patent Laying-Open No. 2015-13441

  The present invention has been made in view of such a situation, and in a food packaging bag that can be cooked by high frequency using a microwave oven, while preventing the burst due to an increase in the internal pressure of the packaging bag during cooking, It is an object of the present invention to provide a packaging bag that can be discharged to the outside and can prevent the contents after the cooking and cooking from spreading out and dripping onto the table or the floor.

As means for solving the above-mentioned problem, the invention according to claim 1 is a packaging bag capable of cooking the contents using a high frequency by a microwave oven, and the packaging bag has three or four side edges. It has a rectangular shape formed by heat-sealing the part, and the body part on one side of the packaging bag has fins that are provided with gussets and heat-sealed on both side parts, and the fins are used for cooking by heating. It is a packaging bag characterized by having a fragile portion that can discharge water vapor to the outside due to an increase in internal pressure due to water vapor.

  The invention according to claim 2 is the packaging bag according to claim 1, characterized in that the packaging bag is composed of a laminate having at least a plastic film base layer and a sealant layer.

  The invention according to claim 3 is the packaging bag according to claim 1 or 2, wherein the fragile portion is formed by scratching the plastic film base layer of the laminate. .

  ADVANTAGE OF THE INVENTION According to this invention, in the food packaging bag which can be cooked by the high frequency using a microwave oven, it can discharge | emit water vapor | steam outside, preventing the burst by the internal pressure rise of a packaging bag at the time of cooking. It is possible to provide a packaging bag capable of preventing the contents after the cooking from being finished from spreading out and dripping onto the table or the floor.

  In particular, according to the second aspect of the present invention, in a food packaging bag that can be cooked at a high frequency using a microwave oven, to the outside of the water vapor while preventing the burst due to an increase in the internal pressure of the packaging bag during cooking. It is possible to more easily provide a packaging bag that can discharge the contents and prevent bleeding of the contents after cooking by heating and dripping onto the table or floor.

  In particular, according to the third aspect of the present invention, in a food packaging bag that can be cooked at high frequency using a microwave oven, to the outside of the water vapor while preventing the burst due to an increase in the internal pressure of the packaging bag during cooking. It is possible to provide a packaging bag that can effectively discharge the contents, and can effectively prevent the contents from spreading out after cooking and dripping onto the table or floor. It is.

FIG. 1 is a schematic perspective view for explaining an embodiment of a packaging bag according to the present invention. FIG. 2 is a partial cross-sectional schematic diagram for explaining a state before heating in a cooking bag by a microwave oven according to the present invention. FIG. 3 is a partial cross-sectional schematic view for explaining the heating state of the packaging bag according to the present invention in the state of cooking by the microwave oven. FIG. 4 is a partial cross-sectional schematic diagram for explaining a state after heating in the cooking state of the packaging bag according to the present invention by the microwave oven. FIG. 5 is a schematic perspective view for explaining the function of the fin after cooking of the packaging bag according to the present invention. FIG. 6 is a partial cross-sectional schematic view for explaining an embodiment of the layer structure of the laminate constituting the packaging bag according to the present invention. FIG. 7 is a schematic perspective view for explaining an embodiment of the packaging bag according to the present invention. FIG. 8 is a schematic plan view for explaining a comparative example of the packaging bag according to the present invention.

  DETAILED DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the examples shown here, but is limited by the claims.

  FIG. 1 is a schematic perspective view for explaining an embodiment of a packaging bag according to the present invention. The packaging bag (100) according to the present invention is a packaging bag capable of cooking the contents by a microwave oven, and the packaging bag (100) includes a heat seal portion (3) and a heat seal at the peripheral edge in three or four sides. The bag is formed into a rectangular shape by the portion (8).

  In the example shown here, the heat seal part (3) on three sides is heat sealed, and after filling the contents from the opening part at the top of the packaging bag, the opening part is sealed by the heat seal part (8). .

  Alternatively, the body part (20) of the packaging bag (100) is made by heat-sealing the two ends of the body part with the lower side of the body part folded, leaving an opening at the upper part of the packaging bag, and after filling the contents, The opening may be sealed by heat sealing.

  The packaging bag (100) has fins (10) formed by gusseting the body (20) of the packaging bag (100). The fin (10) is formed by heat-sealing at least the heat seal portions (2) at both the left and right ends of the gusset, and in addition, the fold-back portion (9) of the gusset can be heat-sealed.

  The fin (10) of the packaging bag (100) has a fragile portion (1) that can discharge water vapor in cooking by a microwave oven. The fragile portion (1) is caused by the increase in internal pressure due to the generation of water vapor during cooking, and the entire packaging bag (100) including the fins (10) swells, and further, the fragile portion (1) is destroyed and the packaging bag ( 100) is a portion where the inner side and the outer side are connected, from which the water vapor inside the packaging bag (100) can be discharged to the outside of the packaging bag (100).

  A packaging bag can be comprised from the laminated body which has a plastic film base material layer and a sealant layer at least. By stacking and heat-sealing the sealant layers of the two laminated bodies or the laminated bodies folded and overlapped, the packaging bag can be made using the laminated body.

  FIG. 2 is a partial cross-sectional schematic diagram for explaining a state before heating in a cooking bag by a microwave oven according to the present invention. The packaging bag (100) filled with the contents (4) is placed in a microwave oven with the fin (10) with the weakened portion (1) facing up for cooking by a microwave oven. Put in. At this time, the fragile portion is placed between the body portion of the packaging bag (100) and the fin (10).

  FIG. 3 is a partial cross-sectional schematic view for explaining the heating state of the packaging bag according to the present invention in the state of cooking by the microwave oven. When cooking of the content (4) by high frequency using a microwave oven is started, the moisture contained in the content (4) becomes water vapor (5) and fills the inside of the packaging bag (100), The volume of the entire packaging bag (100) increases due to the increase in internal pressure, and the fin (10) also has a bulge.

  Subsequently, the weakened portion (1) provided on the fin (10) is destroyed by the increased internal pressure, the inside and outside of the packaging bag (100) are connected, and the water vapor (5) inside is placed outside the packaging bag (100). Discharged.

  At this time, the content (4) is steamed by the generated water vapor with heating. Such a cooking method is preferably used in, for example, Shumai and Chinese buns.

  FIG. 4 is a partial cross-sectional schematic diagram for explaining a state after heating in the cooking state of the packaging bag according to the present invention by the microwave oven. When the packaging bag (100) filled with the contents is heated for a predetermined time and cooking is completed, water vapor is not emitted, and the volume of the packaging bag (100) gradually decreases, and the packaging bag (100) And the contents (4) are in contact with each other.

  The fin (10) also has a reduced volume and is in contact with the body as before heating. Moreover, since the weak part (1) provided in the fin (10) has already communicated inside and outside, a part of the contents (4) becomes a liquid leak (6) and leaks out of the packaging bag (100). There is.

  Conventionally, for example, if a packaging bag with a fragile part without fins is taken out of the microwave oven as it is after cooking and is placed on tableware, liquid leakage (6) from the fragile part will occur. There was a risk of dripping onto the floor, adhering to fingers, and soiling the table.

  In the packaging bag (100) by this invention, since the fin (10) is provided in the trunk | drum of the packaging bag (100), it can play the role which catches this liquid leak (6). The reception of the liquid leak (6) by the fin (10) is particularly effective when the upper part of the packaging bag is held by fingers.

  FIG. 5 is a schematic perspective view for explaining the function of the fin after cooking of the packaging bag according to the present invention. In this figure, the packaging bag (100) after cooking is in a state of being picked up with fingers or the like with the upper portion of the packaging bag (100) facing up.

  In addition, the contents are in a state of being accumulated at the lower side of the packaging bag, and swell toward the lower portion of the packaging bag (100). The fin (10) has a role of receiving and blocking the liquid leakage (6) from the weak part (1) provided in the fin (10) from flowing down toward the lower part of the packaging bag (100). If it is going to be received by the fin (10) of the body part, the fin (10) is also concaved upward due to the bulging toward the lower part of the packaging bag (100), and it becomes a more preferable shape for receiving.

  If it is in such a state, taking out the packaging bag (100) from the interior and carrying it, or tearing the upper part of the packaging bag (100) and taking out the contents (4) is also affected by the liquid leakage (6). It becomes difficult and can be done easily.

  As described above, the packaging bag according to the present invention can appropriately discharge water vapor to the outside while preventing the packaging bag from rupturing in cooking by a microwave oven, and liquid leakage of the contents is outside the packaging bag. It is possible to provide a packaging bag that can be prevented from adhering or dripping on a table or floor.

  Although the packaging bag by this invention can be comprised from the laminated body which has a sealant layer by using a plastic film as a base material, FIG. 6 is one Embodiment of a layer structure of the laminated body which comprises the packaging bag which concerns on this invention. It is a fragmentary sectional schematic diagram for demonstrating.

  In the embodiment shown here, the sealant layer (26) is arranged on the surface that becomes the inside of the packaging bag. Therefore, when the laminate (30) is heat sealed using this sealant layer (26) and a packaging bag is made, the contents are filled and stored in the packaging bag in contact with the sealant layer (26). The

A gas barrier film (23) is disposed on the outer surface of the packaging bag for the purpose of improving the storage stability of the contents. The gas barrier film (23) is a gas barrier made of an inorganic compound on the plastic film (21). A layer (22) is provided.

  Moreover, in the example shown here, the plastic film base material layer is arrange | positioned as a plastic film base material layer (25) in the middle of a laminated body (30), and it affects the mechanical characteristics of the whole laminated body (30). be able to.

  For example, when a stretched polyamide film is used for this layer, mechanical strength such as toughness against piercing and toughness against impact can be imparted to the laminate (30). The plastic film substrate layer (25) can be laminated via the adhesive layer (24).

  The layer structure of the laminate (30), its material structure, thickness, and the like can be appropriately designed according to the required quality for the packaging bag.

(Plastic film)
The plastic film of the plastic film base material layer (25) constituting the laminate (30) is a film made of a polymer resin composition, for example, polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate). , Polyethylene naphthalate, etc.), polyamide (nylon-6, nylon-66, etc.), polyimide, and the like can be used and are appropriately selected according to the application. In particular, when polypropylene or polyethylene terephthalate is used as the plastic film base layer (25), it is more preferable in terms of film strength and price.

(Sealant layer)
The sealant layer (26) is disposed on at least one surface of the laminate, and the two laminates are stacked so that the sealant layers (26) face each other, and are heat-sealed by heat and pressure to bond each other. And making it possible to make a bag into the packaging bag (100).

  As a material for the sealant layer (26), a polyolefin-based resin is generally used among thermoplastic resins, and specifically, a low density polyethylene resin (LDPE), a medium density polyethylene resin (MDPE), a linear low Ethylene resins such as density polyethylene resin (LLDPE), ethylene-vinyl acetate copolymer (EVA), ethylene-α olefin copolymer, ethylene-methacrylic acid resin copolymer, blend resin of polyethylene and polybutene, Polypropylene resins such as homopolypropylene resin (PP), propylene-ethylene random copolymer, propylene-ethylene block copolymer, and propylene-α-olefin copolymer can be used.

  For the formation of the sealant layer (26), a molten resin can be formed using an extruder or the like to form a layer on the laminate (30). Alternatively, it is possible to form a sealant layer on the surface of the laminate (30) by laminating materials that have been formed into a film in advance by lamination.

(Print layer)
Although not shown in FIG. 6, image enhancement as a product and necessary information about the contents can be provided by printing on the layer (30) visible from the outside of the packaging bag, if necessary. . For the base film for that purpose, a plastic film made of a polymer material can be used.

A plastic film is a film made of a polymer resin composition. For example, polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon-6, nylon-66, etc.), polyimide Etc. can be used, and is appropriately selected according to the application and required quality. In particular, when polypropylene or polyethylene terephthalate is used as a base film, it is more preferable in terms of film strength and price.

  Here, the printing method and printing ink are not particularly limited, but from the known printing methods, the printability to the film, the design such as the color tone, the adhesion, the safety as a food container, etc. For example, a gravure printing method, an offset printing method, a gravure offset printing method, a flexographic printing method, or an ink jet printing method can be used. Of these, the gravure printing method can be preferably used in terms of productivity and high definition of the pattern.

(Gas barrier layer)
Further, for the purpose of improving the storage stability of the contents, an opaque layer that blocks ultraviolet rays, such as a colored film, can be provided in the laminate (30) if necessary. Or a gas barrier layer (22) can be provided in a laminated body (30). The example shown in FIG. 6 is an example using a gas barrier film (23) in which a gas barrier layer (22) is provided on the surface of a plastic film layer (21).

  The plastic film used for the gas barrier film (23) is a film made of a polymer resin composition, such as polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide ( Nylon-6, Nylon-66, etc.), polyimide, and the like can be used and are appropriately selected according to the application. In particular, when polypropylene or polyethylene terephthalate is used as the plastic film base layer (25), it is more preferable in terms of film strength and price.

  When heating cooking with a microwave oven is assumed, a metal foil such as an aluminum foil or an aluminum vapor deposition layer cannot be used as a gas barrier layer. This is because it is not preferable that the metal part generates heat more than necessary or sparks due to high frequency heating. However, a gas barrier film (23) provided with a gas barrier layer (22) on the surface of the plastic film layer (21) can be used instead.

  In the case of the gas barrier film (23), the gas barrier layer (22) can be composed of a vapor deposition layer and a coating layer of an inorganic compound. After the anchor coat is provided on the plastic film, the vapor deposition layer and the coating layer are sequentially provided.

  For example, urethane acrylate can be used for the anchor coat layer of the gas barrier film (23). For the formation of the anchor coat layer, a coating method using a printing technique such as gravure coating with a paint in which a resin is dissolved in a solvent can be used, and a coating film can be formed using a generally known coating method.

  As a method of forming a vapor deposition layer, an inorganic compound such as SiO or AlO is coated on a base film provided with an anchor coat layer using a vacuum vapor deposition method, and an inorganic compound layer is formed by a vacuum vapor deposition method. it can. The thickness of the vapor deposition layer is preferably 15 nm to 30 nm.

As a method for forming the coating layer, an aqueous solution or water / alcohol containing at least one of a water-soluble polymer and (a) one or more alkoxides or hydrolysates thereof, or (b) tin chloride. A coating agent mainly composed of a mixed aqueous solution is applied onto a film and dried by heating to form an inorganic compound layer by a coating method to form a coating layer. At this time, by adding a silane monomer to the coating agent, adhesion with the anchor coat layer can be improved.

  An inorganic compound layer has a gas barrier property only by a coating film formed by a vacuum deposition method, but a coating layer that is an inorganic compound layer formed by a coating method is formed on a vapor deposition layer that is an inorganic compound layer formed by a vacuum deposition method to form a gas barrier layer. be able to.

  By combining these two layers, a reaction layer of both layers is formed at the interface between the inorganic compound layer by the vacuum deposition method and the inorganic compound layer by the coating method, or the inorganic compound layer by the coating method becomes an inorganic compound layer by the vacuum deposition method. A dense structure is formed by filling and reinforcing defects such as pinholes, cracks, and grain boundaries, or by reinforcing them, so that high gas barrier properties, moisture resistance, and water resistance are achieved, and flexibility that can withstand deformation is achieved. Therefore, it can be suitable as a packaging bag.

  When SiO is used as the gas barrier layer (22), for example, the coating is transparent, so that the contents can be seen from the outside of the packaging bag. These may be properly used depending on the application and required quality.

  In addition, since metal foil is not used as a gas barrier layer, it is suitable for high-frequency heating using a microwave oven, has no hindrance to the use of metal detectors used for product inspections, etc. There is also an advantage in the resilience of the container shape when it is used by pushing.

(Adhesive layer)
When the layers constituting the laminate (30) are laminated, the layers can be laminated via the adhesive layer (24). As a material for the adhesive, for example, a polyester-isocyanate resin, a urethane resin, a polyether resin, or the like can be used.

  As a lamination method, dry lamination or non-solvent lamination can be used. Or when using a thermoplastic resin, a laminate or a layer can also be formed using an extruder.

  In the following, further detailed explanations of the other characteristic elements constituting the packaging bag according to the present invention will be individually added.

(Vulnerable part)
The weak part (1) is shown in the schematic perspective view of FIG. 1, and is provided on one surface of the fin (10) of the packaging bag (100). This surface is preferably provided on the upper surface when the upper part of the packaging bag is held with fingers.

  The fragile portion (1) is provided such that the fragile portion (1) is destroyed before the entire packaging bag (100) is ruptured by an increase in the internal pressure of the packaging bag (100) due to water vapor, and the inside and outside are communicated. For example, the laminate can be formed by scratching a plastic film substrate layer.

  The fragile portion is (1) provided on one surface of the fin (10) of the packaging bag (100), but the fin is preferably provided in the region of the central portion (20) of the trunk portion of the packaging bag (100). .

  This is because when the packaging bag (100) expands due to an increase in the internal pressure due to cooking, the packaging bag (100) tends to expand upward in a spherical shape, so that the drainage of water vapor is easier at the center. In addition, after the end of cooking, the fin (10) has a role of receiving and blocking the liquid leakage (6) flowing down toward the lower portion, which can be made more effective.

(Scratch processing)
The flaw processing can be formed by, for example, laser beam irradiation, or can be formed by perforation processing using a blade.

(Machi)
In order to form the fin (10) of the packaging bag (100) shown in the schematic perspective view of FIG. 1, the gusset is formed by pinching and folding the laminated body of the body portion (20), and the heat seal portions at both ends thereof (2) is formed by heat sealing.

  In addition to both ends, the folded portion (9) may also be heat sealed. The fin (10) thus formed is positioned below the fragile portion (1), and can receive and block liquid leakage from the fragile portion (1) due to cooking.

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the examples shown here. The invention is limited only by the following claims.

<Example>
FIG. 7 is a schematic perspective view for explaining an embodiment of the packaging bag according to the present invention.
The form of the Example shown here is a packaging bag with the fin (10) containing the weak part (1) by this invention. The fragile portion (1) is provided on the upper side of the packaging bag of the fin (10).
The laminate constituting the packaging bag (100) is a sealant layer having a thickness of 50 μm, and the plastic film substrate layer is polyethylene terephthalate having a thickness of 12 μm. Moreover, the weak part (10) was formed in this plastic film base material layer by flaw processing.
The size of the packaging bag (100) is a vertical length of 140 mm and a lateral width of 130 mm.

<Comparative example>
FIG. 8 is a schematic plan view for explaining a comparative example of the packaging bag according to the present invention.
The form of the comparative example shown here is a packaging bag with a weak part (1). However, the point which does not provide the fin (10) shown in FIG. 7 differs from an Example. The fragile part (1) is provided directly on the trunk part (20).
The laminate constituting the packaging bag (100) is a sealant layer having a thickness of 50 μm, and the plastic film substrate layer is polyethylene terephthalate having a thickness of 12 μm.
Moreover, the weak part (1) was formed in this plastic film base material layer by the flaw process similarly to the Example.
The size of the packaging bag (100) is a vertical length of 140 mm and a lateral width of 130 mm as in the embodiment.

<Evaluation and verification>
Evaluation and verification were performed on the packaging bag samples prepared in the examples and comparative examples under the following conditions. (The number of samples shall be 20 each)
Contents: 150g of water
Microwave oven heating conditions: 1000 W for 2 minutes using AX-SI manufactured by SHARP.
Procedure: (1) After heating in the microwave, the packaging bag is taken out from the cabinet in 30 seconds.
(2) Let stand for 1 minute in a suspended state with the top of the packaging bag facing up.
(3) Visually confirm the state of water dripping.

The criteria for evaluation and verification are as follows.
◯: No water dripping on the floor.
X: Water dripping on the floor is observed.

  Table 1 shows the results of evaluation and verification.

  In the results shown in Table 1, in the packaging bag according to the present invention, no water dripping on the floor was observed in all 20 samples, whereas in the comparative example, 5 out of 20 samples. Water drops on the floor were observed in the pieces.

  This is considered to be because water dripping was blocked by the fins of the packaging bag according to the present invention. Thus, according to the present invention, in cooking with a microwave oven, water vapor can be discharged to the outside while preventing the packaging bag from rupturing, and the content can be prevented from dripping onto the table or floor. It was possible to verify that it was possible to provide a packaging bag.

DESCRIPTION OF SYMBOLS 1 ... Fragile part 2 ... Heat seal part 3 ... Heat seal part 4 ... Contents 5 ... Water vapor 6 ... Liquid leak 8 ... Opening part heat seal 9 ... Folding Part 10 ... Fin 20 ... Body 21 ... Plastic film layer 22 ... Gas barrier layer 23 ... Gas barrier film 24 ... Adhesive layer 25 ... Plastic film substrate layer 26 ... -Sealant layer 30 ... Laminated body 100 ... Packaging bag

Claims (3)

A packaging bag capable of cooking the contents using high frequency by a microwave oven,
The packaging bag has a rectangular shape formed by heat-sealing the peripheral part of three or four sides,
The body on one side of the packaging bag has a gusset and heat-sealed fins on both sides,
The fin has a fragile portion that can discharge water vapor to the outside by an increase in internal pressure due to water vapor of cooking.   The said packaging bag consists of a laminated body which has a plastic film base material layer and a sealant layer at least, The packaging bag of Claim 1 characterized by the above-mentioned.   The packaging bag according to claim 1, wherein the fragile portion is formed by scratching the laminated plastic film base layer.