JP5887758B2 - Microwave cooking packaging container - Google Patents

Description

  The present invention relates to a microwave packaging container that can be deep-drawn and manufactured by heat-sealing the periphery of a bottom material that contains contents in a formed accommodation part and a top material that seals the contents to the bottom material. In more detail, each of the bottom material and the top material has a laminated structure in which at least a sealant layer, a printing base material layer, and a surface base material layer are laminated in order from the inner surface of the container. In addition, a steam port portion made of a high temperature softening resin that has been coated with a pattern is formed between the surface base material layer, and the container center side portion of the steam port portion is placed on the contents side for heat sealing around the steam port portion. The present invention relates to a microwave cooking packaging container provided with a protruding part.

  Conventionally, frozen foods and processed foods of chilled foods are frozen in a packaging bag made of plastic packaging material or a container using the packaging material as a lid, and cooked in a microwave oven. Has been. This packaging material has a laminated structure composed of a heat-resistant base material layer and a sealant layer, and has a predetermined strength in a temperature environment below room temperature between these layers, but a high temperature at which the predetermined strength decreases in a high temperature environment. By providing the softening resin layer in at least one region, it does not peel off due to pressure or impact applied during normal transportation or storage, and when the contents are heated together with the packaging material directly in a microwave oven, A microwaveable packaging material that can reduce the internal pressure of the packaging bag or container so as not to affect the contents by partially destroying the sealant layer, and a packaging bag and container using the packaging material (For example, Patent Document 1).

JP 2000-190912 A

  In the packaging material for microwave ovens such as the above-mentioned Patent Document 1, the packaging material is contained in a bag-making product containing contents such as processed foods or a container containing these contents between the packaging materials simply having a laminated structure. Is used as a lid. On the other hand, for processed food packaging materials, a bottom material (film sheet) is thermoformed as a deep-drawn packaging material, and one or a plurality of accommodating portions are formed by a deformation mold or the like. There is also a well-known technique in which the contents are accommodated, the opening is covered with a top material (film sheet), and the periphery of the bottom material and the top material is heat sealed while the packaging material is filled with vacuum or gas.

However, in such a deep drawing packaging material, since the bottom material is thermoformed by a mold in the molding process for forming the accommodating portion in the bottom material, the packaging generated by heating the microwave oven as described above. When a high-temperature softening resin layer for use in a microwave oven, which is used to release the internal pressure of the material, is provided between the laminated structures of the materials constituting the bottom material, the high-temperature softening resin layer melts at the time of molding. The function cannot be achieved, and the high temperature softening resin layer cannot be used.
Thus, in the conventional deep drawing packaging material can not Rukoto to correspond to the physical tone to packaging material containing the contents directly in a microwave oven, then taken out dishes prepared the contents of the content separately However, there is a problem that cooking takes time and labor without cooking the microwave oven or opening the packaging material over time.
Under such circumstances, the present onset Ming, and it can be applied to high-temperature softening resin layer to stop packaging material deep, with save time cooking, it is possible to improve the productivity of the packaging material in the manufacturing process, corresponding to the microwave cooking A deep-drawn packaging material with an automatic opening function is provided.

For this reason, the invention according to claim 1 is formed by heat-sealing each peripheral portion of the bottom material that accommodates the contents in the formed accommodating portion and the top material that seals the contents to the bottom material. In the microwave cooking packaging container capable of deep drawing, each of the bottom material and the top material has a laminated structure in which at least a sealant layer, a printing base material layer, and a surface base material layer are laminated in order from the inner surface of the container, the top material, said sealant layer, between the surface substrate layer, to form a vapor inlet section comprising a pattern coated hot softened resin, Hitoshi Le high temperature softening resin layer of the vapor opening peripheral edge and it is characterized in that it has a protrusion protruding to the content side in the container the central portion of said vapor outlet portion.

  The invention according to claim 2 is the microwave cooking packaging container according to claim 1, wherein the steam port portion is formed in the vicinity of the center of one side constituting the peripheral portion of the container.

The invention according to claim 3 is the microwave cooking packaging container according to any one of claims 1 to 2, wherein the heat seal of the bottom material and the top material peripheral portion does not provide the steam port portion. The seal width of the side is formed wider than the seal width of the side where the steam port portion is provided.

Invention of Claim 4 is the microwave cooking packaging container of any one of Claims 1-3 , The heat seal of the said bottom material and top material peripheral part is an inner corner | angular part of this heat seal It is characterized by bending.

Invention according to claim 5, in microwave cooking packaging container according to any one of claims 1 to 4, wherein the high temperature softening resin, ethylene - vinyl acetate copolymer resin or a polyamide, nitrocellulose And a resin containing polyethylene wax.

The invention according to claim 6 is the microwave cooking packaging container according to any one of claims 1 to 5, characterized in that an intermediate layer is interposed in the laminated structure of the bottom material. .

According to the first aspect of the present invention, deep drawing manufacturing is performed by heat-sealing each peripheral edge of a bottom material that accommodates the contents in the formed accommodating portion and a top material that seals the contents to the bottom material. In a possible microwave cooking packaging container, each of the bottom material and the top material has a laminated structure in which at least a sealant layer, a printing base material layer, and a surface base material layer are laminated in order from the inside of the container. , and the sealant layer, between the surface substrate layer, to form a vapor inlet section comprising a pattern coated hot softened resin, the steam inlet portion periphery the Hitoshi Le high temperature softening resin layer, of the steam inlet portion because it has a protrusion protruding to the contents of side a container central portion, by forming the vapor outlet part made of a high-temperature softening resin top member side without forming the accommodating portion for accommodating the contents, electrostatic Deep drawing production also in range packaging container is made possible. Moreover, by expanding the heat seal width of the steam port portion by the protruding portion, the shape retaining property of the steam port portion can be maintained, and the internal pressure in the packaging container can be surely released from the steam port portion during cooking in the microwave oven. .

  According to the invention described in claim 2, since the steam port portion is formed in the vicinity of the center of one side constituting the peripheral portion of the container, the shape retaining property of the steam port portion can be maintained, and the packaging port can be maintained from the steam port portion. The internal pressure can be surely released.

  According to invention of Claim 3, the heat seal of the bottom material and the top material peripheral part is the seal width of the side where the steam port part is not provided, with respect to the seal width of the side where the steam port part is provided. Since it is formed widely, the heat seal width of the side that does not have the steam port is widened, so this wide heat seal width suppresses curling of the stretched film in the top material, and the side of the packaging container is flat It is possible to improve convenience such as displayability of packaging containers and visibility of printed contents.

According to the invention described in claim 4, since the heat seal of the bottom material and the peripheral portion of the top material is bent at the inner corner of the heat seal, a part of the solid matter of the contents enters the bent portion. There is no stagnation. That is, when the cooking by a microwave oven, some of the solids content became harder and the like burned is, without puncturing the packaging container enters the inner corner portion of the heat seal, the contents The outflow of things can be prevented.

According to the invention of claim 5, the high-temperature softening resin, ethylene - vinyl acetate copolymer resin or a polyamide, since a resin containing nitrocellulose and a polyethylene wax, when heated in a microwave oven, the melting point However, it is possible to easily cause partial peeling of a part of the sealant layer and the high-temperature softening resin of 60 to 90 degrees, and the internal pressure in the packaging container can be surely released from the steam port.

  According to the sixth aspect of the present invention, since the intermediate layer is interposed in the laminated structure of the bottom material, generation of pinholes caused by vibration or collision during transportation is prevented, and the sealing performance of the contents is maintained. can do.

It is a side surface schematic diagram of the packaging container for microwave ovens which can show deep drawing manufacture which shows an example of this invention. It is the perspective view which showed the packaging container for microwave ovens typically. It is an expanded sectional view of a top material. It is an expanded sectional view of a bottom material. It is explanatory drawing which makes a top material seal the bottom material which accommodated the content in the accommodating part. It is the whole perspective view which showed an example of the deep drawing packaging manufacturing machine. It is explanatory drawing by which the internal pressure of a packaging container is discharge | released from a steam-mouth part at the time of the heat cooking by a microwave oven. It is an expanded sectional view of the bottom material which shows the internal pressure discharged | emitted from a steam port part. It is an enlarged plan view of the vicinity of the steam port portion showing a protruding portion in which the container inner side portion of the steam port portion is protruded inside the packaging container. It is a plane schematic diagram of the packaging container for microwave ovens which provided the steam port part in the outer side part by the side of a short side. It is a plane schematic diagram of the packaging container for microwave ovens which shows the example which expanded the heat seal width by the packaging container long side. It is a plane schematic diagram of the packaging container for microwave ovens which bent the inner corner | angular part of the heat seal in a bottom material and a top material peripheral part.

The best mode for carrying out the present invention will be described below with reference to the drawings. FIG.
FIG. 2 is a schematic side view of a microwave packaging container that can be manufactured by deep drawing, and FIG. 2 is a perspective view schematically showing the microwave packaging container.

  As shown in FIG. 1, the microwave packaging container 1 capable of manufacturing deep drawing according to the present invention includes a bottom material 3 for storing contents 5 in a storage portion 4 formed by a well-known deep drawing machine 6 described later, The peripheral portions (four sides) of the top material 2 that seals the contents 5 to the bottom material 3 are heat-sealed.

  The contents 5 are processed foods such as frozen foods and chilled foods, for example, solid foods such as cucumbers, or solid foods such as hamburgers and meatballs and liquids such as sauces applied to them. Illustrated.

Next, the structure of the top material 2 and the bottom material 3 and the features of the present packaging container will be described. 3 is an enlarged cross-sectional view of the top material, FIG. 4 is an enlarged cross-sectional view of the bottom material, FIG. 5 is an explanatory diagram for sealing the top material to the bottom material in which the contents are accommodated in the accommodating portion, and FIG. 7 is an overall perspective view showing an example, FIG. 7 is an explanatory view in which the internal pressure of the packaging container is released from the steam port during cooking by a microwave oven, and FIG. 8 is a bottom material showing the internal pressure released from the steam port. FIG. 9 is an enlarged cross-sectional view, and FIG. 9 is an enlarged plan view in the vicinity of the steam port portion showing a protruding portion in which the container inner side portion of the steam port portion is protruded inside the packaging container.

  First, as shown in FIG. 3, the top material 2 has a surface base material layer 11, an adhesive layer 12, and a printing base material in order from the outer side (upper surface in FIG. 3) toward the inner side where the contents 5 are sealed and contacted. This is a laminate composed of the layer 13, the color ink 14, the white ink 15, the adhesive layer 16 and the sealant layer 17.

  The surface base material layer 11 has heat resistance and is an indispensable layer of the top material 2. When the packaging container 1 is manufactured using the top material 2, the surface base material layer 11 is provided so as to be disposed outside. . The surface base material layer 11 is not particularly limited as long as it is used as a packaging material for frozen foods or chilled foods that are generally heated or cooked in a microwave oven. For example, in addition to stretched polyethylene terephthalate film (PET), silica-deposited polyethylene terephthalate film, alumina-deposited polyethylene terephthalate film, stretched nylon film, silica-deposited stretched nylon film, alumina-deposited stretched nylon film, stretched polypropylene film, polyvinyl alcohol-coated stretched polypropylene film Any of a nylon 6 / meta-xylenediamine nylon 6 co-extrusion co-stretched film, a polypropylene / ethylene-vinyl alcohol copolymer co-extrusion co-stretched film, and the like can be used.

  These surface base material layers 11 usually have a melting point of 150 ° C. or higher and a thickness of 10 to 50 μm. In addition, in order to improve the tolerance at the time of transportation, this surface base material layer 11 may further laminate this surface base material layer 11 as a protective layer.

  The adhesive layers 12 and 16 may be a known material that does not have a sanitary problem, such as a two-component curable polyurethane adhesive.

  The printing base material layer 13 can use a stretched nylon film (ONy) or the like, and is provided for the purpose of content display or imparting aesthetics by a known printing method, and is used as necessary. Usually, this printing base material layer 13 is formed so as to be on the lower surface side of the surface base material layer 11, that is, inside the surface base material layer 11 (the contents 5 side) when the packaging container 1 is produced. .

  The sealant layer 17 is provided on the lower surface of the printing base material layer 13 via an adhesive, and becomes the innermost layer in contact with the contents 5 when the packaging container 1 is manufactured. As this sealant layer 17, a low density polyethylene film, an ultra low density polyethylene film, a linear low density polyethylene film, a medium density polyethylene film, a high density polyethylene film (abbreviation of these polyethylene films is PEF), an unstretched polypropylene film, Ethylene-vinyl acetate copolymer film, ethylene-acrylic acid copolymer film, ethylene-methacrylic acid copolymer film, ethylene-methyl acrylate copolymer film, ethylene-ethyl acrylate copolymer film, ethylene-methyl methacrylate copolymer Any one or more of a polymer film and an ionomer film are used to form a single layer sealant layer or a multilayer sealant layer.

  The thickness of these sealant layers 17 is usually 20 to 60 μm. In the present invention, when the packaging container 1 is manufactured, the sealant layers 17 form a sealing surface at the sealed portion of the packaging container 1, so that a release agent layer having a low sealing strength as in a conventional packaging container. As a result, a part of the sealing surface is not formed, and the bonded sealing surface is not broken and the contents are not exposed during freezing, transportation, storage, or the like.

Further, for example, the long side of the packaging container 1 located outside the color ink 14 (a container having the same length of each side of the container periphery, such as a square, may be one side constituting the periphery of the packaging container 1). A high temperature softening resin layer 18 is pattern-coated on the lower surface of the printing base material layer 13 by a well-known method between the outer end portion in the vicinity and the housing portion 4. It becomes the steam port part 7 of the packaging container 1 formed by heat-sealing the material 2 and the bottom material 3. With such a formation position of the steam inlet part 7, can be maintained shape retention of a steam inlet part 7, it is possible to surely miss the internal pressure of the packaging container 1 from the steam inlet part 7.

  The high temperature softening resin layer 18 is exemplified by a material having a melting point of 60 to 90 ° C., for example, an ethylene-vinyl acetate copolymer resin or a resin containing polyamide, nitrified cotton, and polyethylene wax. By using a resin layer having a melting point of 60 to 90 ° C., partial heating of the high-temperature softening resin layer 18 and the sealant layer 17 can easily occur when heated in a microwave oven.

  The thickness of the high temperature softening resin layer 18 is preferably 1 to 5 μm. If the thickness of the high-temperature softening resin layer 18 is less than 1 μm, there is a disadvantage that the high-temperature softening resin layer 18 and the sealant layer 17 are not easily broken when heated in a microwave oven. When the thickness exceeds 5 μm, depending on the pattern of the high-temperature softening resin layer 18, when the obtained film-like top material 2 is wound in a roll shape, a part of the swell is generated, and the packaging material of the part is extended. There is an inconvenience.

  This high-temperature softening resin is printed on the printing base material layer 13 by a well-known perturbation (printing without shading) if the packaging container 1 is dedicated to microwave cooking. If it is used for cooking, it is possible to prevent the occurrence of delamination (delamination) during hot water rotting by printing on a grid as shown in the figure.

  Therefore, as a layer structure of the top material 2, the following structure is illustrated from the outer side (upper surface in FIG. 3) toward the inner side where the contents 5 are sealed and contacted. For example, as structural example 1, it can be PET / adhesive layer / ONy / ink / high temperature softening resin / adhesive layer / PEF. Further, as configuration example 2, ONy / adhesion layer / ONy / ink / high temperature softening resin / adhesion layer / PEF, as configuration example 3, ONy / ink / high temperature softening resin / adhesion layer / PEF, as configuration example 4, PET / Ink / high temperature softening resin / adhesive layer / PEF may be used.

Next, as shown in FIG. 4, the bottom material 3 is directed inward from the outside (the lower surface in FIG. 4) in order to seal and contact the contents 5 housed in the housing portion 4 (not shown in FIG. 4). The laminate is composed of the surface base layer 21, the adhesive layer 22, the printing base layer 23, the color ink 24, the white ink 25, the adhesive layer 26, the intermediate layer 27, the adhesive layer 28, and the sealant layer 29.

Incidentally, the sealant layer 29 of the innermost layer, because the top member 2 is using PEF to open the steam inlet part 7, use PEF of heat-resistant filled both even bottom member 3 side of the heat resistance and cold resistance To do. When printing, molded PET is used to satisfy both printability and moldability. For the outermost layer, unstretched polypropylene (retort CPP) is used in order to satisfy both moldability and heat resistance. In the bottom material 3, the accommodating portion 4 is formed by a deep drawing machine 6 described later from the sealant layer 29 with which the contents 5 come into contact downward.

Note that the bottom member 3, as shown in FIG example, between the adhesive layer 2 8, 26 may be interposed an appropriate intermediate layer 27 closer to the sealant layer 2 9. This intermediate layer 27 may be used as the undrawn nylon (CNY), this intermediate layer 27, preventing the pinholes which may cause the sealant layer 29 such as impact during transportation packaging container 1, the contents The sealing property of the object 5 can be maintained.

Therefore, as a layer structure of the bottom material 3, the following structures are illustrated from the outer side (the lower surface in FIG. 4 ) toward the inner side where the contents 5 are sealed and contacted. For example, as structural example 1, it can be CPP / adhesive layer / molded PET / ink / adhesive layer / CNY / adhesive layer / PEF. Further, the configuration example 2 may use CPP / adhesion layer / CNY / adhesion layer / PEF, and the configuration example 3 may use CPP / adhesion layer / PEF.

  In the manufacture of the top material 2 and the bottom material 3 as described above, the top material 2 prints the pattern print in the printing process and also prints the high-temperature softening resin layer 18. Thereafter, laminating is performed by a dry laminating method with PET and PEF in a laminating process. In the bottom material 3, if there is printing, pattern printing is printed in the printing process, and then laminating is performed in the laminating process by CPP, CNY, PEF and dry laminating methods. Lamination is performed by CPP, CNY, PEF and a dry laminating method in the process, and both are wound in a well-known slitter process.

Then, as shown in FIG. 5, after the contents 5 are accommodated in the accommodating portion 4 formed in the vicinity of the center of the surface of the sealant layer 29 of the bottom material 3 described above, the sealant of the top material 2 is obtained. The contents 5 are hermetically sealed by heat-sealing the periphery of the bottom material 3 with the side of the layer 17 facing the sealant layer 29 side of the bottom material 3.

  For example, as illustrated in FIG. 6, the deep-drawing machine 6 supplies the top material 2 and the bottom material 3 separately to the molding machine by the winding supply devices 31 and 32, and on the line 33, the bottom material 3 is After forming the accommodating portion 4 downward from the sealant layer 29 side by the molding die 34, the contents 5 are supplied into the accommodating portion 4, and the sealant layer 17 side of the top material 2 is placed on the sealant layer of the bottom material 3. The contents 5 are hermetically sealed by facing the 29 side and heat-sealing the peripheral edge while reducing the pressure between them by the heat sealer 35. After that, it is cut into one mouthpiece, and after quick freezing, it is shipped in a box. Since the manufacturing process of the deep drawing machine 6 is a well-known technique, a detailed description is omitted.

Further, as described above, in addition to the heat sealing of the peripheral portions of the top material 2 and the bottom material 3, the steam port portion 7 is also heat sealed. In the present steam port portion 7, as shown in FIG. A protruding portion a is provided in which the heat seal portion is protruded from the inner side (portion central portion) of the mouth portion 7 in the direction toward the inner side of the packaging container 1 (in the direction of the storage portion 4 for storing the contents 5).

Here, when the packaging container 1 in which the contents 5 are sealed is cooked in a microwave oven, as shown in FIG. 7, due to the sealed contents 5, the internal pressure in the housing portion 4 increases the expansion of residual air. The internal pressure rises due to the generation of water vapor from the food, and the internal pressure is discharged outward from the steam port 7.

At this time, as shown in FIG. 8, in the steam port portion 7, the internal pressure in the housing portion 4 whose pressure has increased due to heating by the microwave presses the heat seal portion toward the periphery of the packaging container 1, and heat seal A crack is generated at the edge portion of the sealant, and the sealant layer 17 is split starting from the crack. On the other hand, the high temperature softening resin layer 18 that has become high temperature by heating is peeled off from the printing base material layer 13 because the melting point is 60 to 90 degrees, and the sealant layer 17 in the vicinity of the high temperature softening resin layer 18 and the high temperature softening resin layer 18. Is destroyed, and the internal pressure is discharged outward from the destroyed steam port 7.

  With such a configuration, during cooking with a microwave oven, only the internal pressure steam in the storage unit 4 is released outward from the steam port 7, and the contents 5 are reliably released in the storage unit 4 without splashing outward. Can be cooked to.

In particular, in the present invention, since the steam port portion 7 made of the high-temperature softening resin layer 18 is formed on the top material 2 side where the accommodating portion 4 for accommodating the contents 5 is not formed, such an accommodating portion 4 is formed, In addition, since the packaging container 1 having the steam port portion 7 made of the high-temperature softening resin layer 18 can be manufactured by deep drawing using a deep drawing machine 6 or the like, it is manufactured by deep drawing as before and filled with processed food. When cooking with a packaging container, it is not necessary to take a long time for hot water bathing with the entire packaging container, or to put the contents that are opened and taken out into a microwave oven so that the packaging container 1 can be directly cooked in a microwave oven. Thus, productivity can be improved and cooking effort can be simplified.

In the packaging container 1 of the present invention, the shape retaining property of the steam port portion 7 can be maintained, and the internal pressure generated in the housing portion 4 can be reliably released. FIG. 9 is an enlarged plan view in the vicinity of the steam port portion showing a protruding portion a in which the container inner side portion of the steam port portion is protruded inside the packaging container.

Further, in the heat-sealing of the steam inlet part 7, the projecting portion a is provided, the heat seal width w of the steam inlet part 7, by spreading by the protrusion a, warpage and distortion of the steam inlet part 7 By preventing it, the shape retaining property of the steam port portion 7 can be maintained, and the internal pressure in the packaging container 1 can be surely released from the steam port portion 7 during cooking in the microwave oven.

  In addition, the steam-mouth part 7 of this application packaging container 1 is not limited to the formation position mentioned above. FIG. 10 is a schematic plan view of a microwave packaging container having a steam port provided on the outer side on the short side. In this case, as shown in FIG. 10, a steam port 7 ′ may be formed in the top material 2 near the center on the short side of the peripheral edge in the packaging container 1 in the same manner as described above.

Therefore, even if the steam port portion 7 ′ is formed at this position, the internal pressure in the housing portion 4 whose pressure has increased due to heating by the microwave oven presses the heat seal portion toward the periphery of the packaging container 1. Since the high-temperature softening resin layer 18 that has become high temperature by heating is softened because the melting point is 60 to 90 degrees, the destination direction of the internal pressure is concentrated toward the softened high-temperature softening resin layer 18. A part of the high-temperature softening resin layer 18 and the sealant layer 17 in the vicinity of the high-temperature softening resin layer 18 are destroyed, and the internal pressure is discharged outward from the steam port portion 7 ′ that is the destruction portion. Such 'By the formation position of the steam inlet part 7' the steam inlet part 7 can maintain shape retention, can be reliably miss the internal pressure in the packaging container 1 from the steam inlet part 7 '.

  Next, in the packaging container 1 of the present application, the curling of the steam port portion 7 can be prevented by adjusting the heat seal width. FIG. 11 is a schematic plan view of a microwave packaging container showing an example in which the heat seal width is widened on the long side of the packaging container.

  As described above, the top material 2 of the present packaging container 1 is composed of a stretched film such as PET or ONy, but the bottom material 3 is composed of an unstretched film such as CNY or CPP. When the top material 2 and the bottom material 3 are heat-sealed at the periphery, the stretched film of the top material 2 is stretched, and the top material 2 is curled to the bottom material 3 side, which may cause a disadvantage that it does not become a flat surface. is there.

Therefore, in the packaging container 1 of the present application, the heat seals at the peripheral portions of the bottom material 3 and the top material 2 are the heat seal width h of the side where the steam port portion 7 is not provided, and the heat seal of the side where the steam port portion 7 is provided. It is formed wider than the width h ′. In this case, as shown in FIG example, the heat seal width h of the long side which is the side of the packaging container 1 peripheral provided with no steam outlet portion 7 (or a short side) is, packaging having a vapor inlet part 7 It is formed about 1.5 times wider than the heat seal width h ′ on the short side (which may be the long side) which is the side of the periphery of the container 1. In addition, the left side of the accommodating part 4 in the packaging container 1 in the figure is a heat seal part having a large area on which a product name or the like is printed.

  With such a configuration, the heat seal width of the side portion not having the steam port portion 7 is widened. Therefore, this wide heat seal width suppresses curling of the stretched film in the top material 2, and the packaging container 1. The side portions of the packaging container 1 can be made flat, and convenience such as displayability of the packaging container 1 and visibility of printed contents can be improved.

  Next, in this application packaging container 1, the opening of the packaging container 1 can be prevented by adjusting the peripheral corner of the heat seal. FIG. 12 is a schematic plan view of a microwave packaging container in which the inner corners of the heat seal at the periphery of the top material and the bottom material are bent.

  In this case, as shown in FIG. 12, when the top material 2 and the bottom material 3 are heat-sealed at the four peripheral edges, a heat seal is formed in which bent portions R are formed inside the corners of the four corners. In order to form the bent portion R, for example, a well-known method can be used as appropriate, such as forming the bent portion R at each corner of the four corners of the heat sealer 35.

  With this configuration, a part of the solid content 5 does not enter and stay in the bent portion R. That is, a part of the solid matter of the content 5 that has become harder when it is cooked with a microwave oven does not enter the inner corner of the heat seal and make a hole in the packaging container 1, The outflow of the contents 5 can be prevented.

Next, the present invention will be described in detail by showing specific examples.
The top member, using a PET (16 μm) / adhesive layer / ONy (15 μm) / the inking hot softened resin / adhesive layer / PEF (40 [mu] m), and have use of gravure printing, two-component curing the oriented nylon film type urethane-based ink: was printed (CLIOS / ALFA curing agent = base resin / curing agent manufactured by DIC graphics Corp.). In this case, ethylene-vinyl acetate copolymer resin (melting point: 66.8 ° C., WT-PC agent: manufactured by DIC Graphics) or resin containing polyamide, nitrified cotton and polyethylene wax (melting point: 83.75). 8 ° C., EOP varnish (manufactured by The Inktec Co., Ltd.) was applied in a pattern so as to have a thickness of 3 μm. Further, a 40 μm-thick linear low-density polyethylene film as a sealant layer is dry-laminated on the printed surface side using a two-component curable polyurethane adhesive (RU077 / H7 = main agent / curing agent: manufactured by Rock Paint). Furthermore, on the non-printing side, in order to improve wear resistance, pinhole resistance, and heat resistance, a polyethylene terephthalate film is a two-component curable polyurethane adhesive (RU077 / H7 = main agent / curing agent: manufactured by Rock Paint). Was dry laminated.

In addition, the bottom member, with CPP (80 μm) / adhesive layer / PET (16 μm) / ink / adhesive layer / CNY (20 [mu] m) / adhesive layer / PEF (40 [mu] m), and have use of gravure printing, Two-component curable urethane ink (CLIOS / ALFA curing agent = main agent / curing agent: manufactured by DIC Graphics) was printed on the unstretched polyethylene terephthalate film. Furthermore, an unstretched nylon film considering pinhole resistance and a linear low-density polyethylene film having a thickness of 40 μm as a sealant layer on the printed surface side are a two-component curable polyurethane adhesive (RU077 / H7 = main agent / curing agent). : Laminate using Rock Paint). Furthermore, in order to improve wear resistance, pinhole resistance, and heat resistance, a non-stretched polypropylene film is coated with a two-component curable polyurethane adhesive (RU077 / H7 = main agent / curing agent: manufactured by Rock Paint on the non-printing side. ) Was used for dry lamination. In the bottom material of the present application, as described above, an intermediate layer may be appropriately interposed between the adhesive layers close to the sealant layer, and CNY or the like can be used for this intermediate layer.

  Then, in the deep drawing line (multiple), the contents are filled, both sides are 18mm wide, the top (steam port side) is 7mm (steam port is 14mm) wide, the ground is 20mm wide, and immediately after Frozen. As a result of cooking the packaging container thus prepared in the microwave oven, the deep-drawn packaging material that has been heated to 100 ° C. or higher in the microwave oven and whose internal pressure has been increased by steam has cracks in the edge of the heat seal portion of the packaging bag. As a result, the sealant layer was cracked starting from this crack, and the high-temperature softened resin layer that had been softened by heating at 100 ° C. or higher was peeled off, allowing air in the packaging bag to escape and reducing the internal pressure. The steaming time at this time was stable. In addition, when the top (steam port side) seal was only 7 mm wide, the steam port could be bent, and it was not possible to obtain a stable steaming time.

  The packaging container of the present invention is useful for any container that can be deep-drawn for microwave cooking.

DESCRIPTION OF SYMBOLS 1 Packaging container 2 Top material 3 Bottom material 4 Storage part 5 Contents 6 Deep drawing molding machine 7 Steam port part 18 High temperature softening resin layer

Claims (6)

A bottom material for accommodating the contents in the formed accommodating portion;
A top material for sealing the contents to the bottom material ;
In the microwave cooking packaging container that can be deep-drawn manufactured by heat-sealing each peripheral edge of
Each of the bottom material and the top material has a laminated structure in which at least a sealant layer, a printing base material layer, and a surface base material layer are laminated in order from the inner surface of the container,
In the top material, between the sealant layer and the surface base material layer, a steam port portion made of a high-temperature softening resin that is pattern-coated is formed,
Wherein A Hitoshi Le high temperature softening resin layer of the vapor opening periphery, for microwave cooking packaging container, characterized in that it has a protrusion protruding to the content side in the container the central portion of said vapor outlet portion.   The packaging container for microwave oven cooking according to claim 1, wherein the steam port portion is formed in the vicinity of the center of one side constituting the peripheral portion of the container. The heat sealing of the bottom material and the peripheral edge of the top material is characterized in that a side seal width not provided with the steam port portion is formed wider than a side seal width provided with the steam port portion. The packaging container for microwave oven cooking of any one of Claims 1-2. The microwave cooking wrapping container according to any one of claims 1 to 3 , wherein the bottom seal and the peripheral edge of the top seal are bent at the inner corners of the heat seal. The hot softened resin, ethylene - vinyl acetate copolymer resin or a polyamide, characterized by comprising a resin containing nitrocellulose and polyethylene waxes, microwave oven according to any one of claims 1 to 4 Packaging container for cooking. The packaging container for microwave oven cooking according to any one of claims 1 to 5 , wherein an intermediate layer is interposed in the laminated structure of the bottom material.

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