JP6790471B2 - Package - Google Patents

Description

The present invention relates to a package that can wrap foods and the like and cook them.

The conventional package is disclosed in Patent Document 1. The packaging body of Patent Document 1 is a self-standing packaging body formed of a laminated film, and is composed of a body member and a bottom member. The side portions of the two front and rear body members are heat-bonded, and the lower end portion is heat-bonded to the peripheral edge of the bottom member folded in two.

The folded bottom member expands back and forth due to the weight of the filled contents to form the bottom surface of the package. In addition, a steaming portion for discharging steam is provided on the side portion of the body member, and the package can be cooked in a microwave oven while the package is self-supporting. When the internal pressure inside the storage portion reaches a predetermined pressure due to the steam generated from the contents by heating, the steam is released to the outside through the steaming portion. This prevents the packaging from bursting.

Japanese Unexamined Patent Publication No. 2006-327590

However, according to the above-mentioned conventional package, the self-sustaining stability is low in the front-rear direction, and the package is placed on a tray of a microwave oven and rotated, or the package is caused by the injection pressure of steam ejected from a steaming portion. There was a problem that the contents leaked from the steaming part due to falling.

In view of the above problems, an object of the present invention is to provide a heat-cookable package capable of improving self-sustaining stability.

In order to achieve the above object, the present invention is a packaging body formed of a laminated film having at least an outer layer and an inner layer made of a heat-adhesive resin, and is a tetrahedral-shaped storage unit for storing the contents. The first seal portion and the second seal portion in which the inner layers are heat-bonded to each other along the two sides of the storage portion twisted by 90 ° and opposed to each other are connected to the first seal portion and the second seal portion. It has a third seal portion that extends and one end portion extends in a direction orthogonal to the first seal portion or the second seal portion and heat-bonds the inner layers to each other, and the internal pressure in the storage portion becomes a predetermined pressure. It is characterized in that the first seal portion is provided with a ventilation portion that communicates the storage portion with the outside when it reaches the limit.

Further, the present invention is characterized in that, in the package having the above structure, a symbol capable of distinguishing the vertical direction of the storage portion is provided on the non-forming surface of the third seal portion.

Further, the present invention is characterized in that, in the package having the above structure, the ventilation portion is located above the central portion in the extending direction of the first seal portion.

Further, the present invention is characterized in that, in the package having the above structure, the heat-bonding width of the second seal portion is larger than the heat-bonding width of the first seal portion.

Further, according to the present invention, in the package having the above configuration, the ventilation portion extends in a band shape, and the inner edge of the first seal portion facing the storage portion is formed in a curved shape that is convex in a direction away from the storage portion. It is characterized in that the distance between the inner edge and the outer edge facing the outside air is partially narrowed.

Further, according to the present invention, in the package having the above configuration, the air-permeable portion extends in a strip shape, and the inner edge of the first seal portion facing the storage portion projects in the internal direction of the storage portion and faces the inner edge and the outside air. It is characterized in that the distance from the outer edge is partially narrowed.

Further, according to the present invention, in the package having the above configuration, the air-permeable portion extends in a band shape, and the inner edge of the first seal portion facing the storage portion protrudes inward in the storage portion and the protrusion. It is characterized by consisting of a communication portion that is close to the inner edge and communicates with the outside.

Further, in the present invention, in the package having the above configuration, both ends of the third seal portion extend in a direction orthogonal to the first seal portion and the second seal portion, and the laminated film is formed of the third seal portion. It is characterized by having easy tearability in the direction parallel to the extending direction.

Further, the present invention is characterized in that, in the package having the above structure, an opening start means is provided at the central portion in the extending direction of the first seal portion.

Further, the present invention is characterized in that, in the package having the above structure, at least one layer constituting the laminated film is a uniaxially stretched film stretched in the extending direction of the third seal portion.

Further, the present invention is characterized in that, in the package having the above structure, the inner layer is a uniaxially stretched film stretched in the extending direction of the third seal portion.

Further, the present invention is characterized in that, in the package having the above structure, a barrier layer having a gas barrier property is provided between the outer layer and the inner layer.

According to the present invention, when the tetrahedral-shaped storage portion is twisted by 90 ° and the two opposing sides are adhered by the first seal portion and the second seal portion, and the internal pressure in the storage portion reaches a predetermined pressure on the first seal portion. A ventilation section is provided to communicate the storage section with the outside. Since the tetrahedral-shaped storage portion is stable and self-supporting, it is possible to prevent the package from tipping over. Further, by installing the package in the microwave oven so that the first seal portion extends vertically and heating the package, it is possible to prevent the contents from leaking through the steaming portion during cooking. Further, when the storage portion is broken from the first seal portion and both ends of the broken first seal portion are expanded in a direction away from each other, the opening reaches both ends of the second seal portion and the package is opened in a boat shape. .. As a result, the package can be used as a container after opening, which improves convenience.

The perspective view of the package | body which concerns on 1st Embodiment of this invention. The side view of the package | body which concerns on 1st Embodiment of this invention. The development view of the package | body which concerns on 1st Embodiment of this invention. The cross-sectional view which shows the layer structure of the blank sheet of the package which concerns on 1st Embodiment of this invention. A plan view of a long laminated film in which blank sheets of a package according to a first embodiment of the present invention are connected. The perspective view which shows the state after opening the package which concerns on 1st Embodiment of this invention. The side view of the package | body which concerns on 2nd Embodiment of this invention. The side view which shows the modification of the package body which concerns on 2nd Embodiment of this invention. The side view of the package | body which concerns on 3rd Embodiment of this invention. FIG. 5 is a cross-sectional view showing a layer structure of a laminated film to be laminated which constitutes a package according to a fourth embodiment of the present invention.

<First Embodiment>
Hereinafter, the first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of the package 1, and FIG. 2 is a side view of the package 1. The package 1 is formed of a blank sheet 102 (see FIG. 2), and has a tetrahedral-shaped storage portion 9 composed of a triangular bottom surface 3 and side surfaces 4a to 4c.

The contents 10 are hermetically stored inside the storage unit 9. The bottom seal portion (second seal portion) 5 is formed by heat-bonding the bottom surface 3 and the side surface 4c in a strip shape along one side connecting the side surfaces 4c. The inner edge 13 of the bottom seal portion 5 faces the storage portion 9. Further, the top seal portion (second seal portion) 6 is formed by heat-bonding in a band shape along one side connecting the side surfaces 4a and 4b. The inner edge 14 of the top seal portion 6 faces the storage portion 9. The bottom seal portion 5 and the top seal portion 6 are twisted by 90 ° and face each other.

Further, a back seal portion (third seal portion) 7 is formed by heat bonding continuously from the top seal portion 6 to the bottom seal portion 5. One end of the back seal portion 7 extends from above the top seal portion 6 in a direction orthogonal to the top seal portion 6. Further, the other end of the back seal portion 7 extends from above the bottom seal portion 5 in a direction orthogonal to the bottom seal portion 5. Further, the back seal portion 7 extends so as to straddle one side 11 connecting the bottom surface 3 and the side surface 4a.

The bottom seal portion 5, the top seal portion 6, and the back seal portion 7 are formed by heat-bonding the inner layers 23 (see FIG. 4) of the laminated film 2, which will be described later, with each other at a predetermined width.

Further, the top seal portion 6 is provided with a ventilation portion 6b. The ventilation portion 6b has a recess 61 in a part of the inner edge 14 of the top seal portion 6. The recess 61 is formed in a curved shape that is convex in the direction away from the storage portion 9, and the distance between the inner edge 14 and the outer edge facing the outside air is narrowed in the recess 61.

When the internal pressure in the storage portion 9 rises, the internal pressure concentrates in the recess 61. Therefore, when the internal pressure in the storage portion 9 reaches a predetermined pressure, the inner layer 23 that is first heat-bonded from the recess 61 is peeled off, and the storage portion 9 and the outside communicate with each other. As a result, the steam generated from the content 10 can be discharged to the outside through the steaming section 6b, and the content 10 can be cooked while preventing the storage section 9 from bursting.

The heat-bonding width of the bottom seal portion 5 may be larger than the heat-bonding width of the top seal portion 6. As a result, when the package 1 is installed so that the bottom seal portion 5 comes into contact with the installation surface as shown in FIG. 1, the self-supporting stability of the storage portion 9 is further improved. Further, when the internal pressure rises, the inner layer 23 of the bottom seal portion 5 is peeled off before the ventilation portion 6b, and the contents 10 can be prevented from leaking from the bottom seal portion 5.

The upright state of the package 1 is a state in which the bottom surface 3 is in contact with the installation surface so that the top seal portion 6 extends in the vertical direction as shown in FIG. 1, and the front surface of the package 1 is in the established state. Faces the top seal portion 6 and the back seal portion 7 becomes a non-formed side surface 4c. Further, the side surface 4b and the side surface 4c, which are non-formed surfaces of the back seal portion 7, are provided with a symbol capable of distinguishing the vertical direction of the storage portion 9. Specific examples of the design include characters, figures, symbols, and patterns.

The user recognizes the vertical direction of the storage portion 9 by using the symbols provided on the front side surface 4c and the non-forming surface of the back seal portion 7 as markers. Therefore, the user can be guided to install the package 1 in the microwave oven in an upright state.

This makes it possible to prevent the user from accidentally installing the package 1 in the microwave oven so that the side surface 4a, which is the non-formed surface of the back seal portion 7, comes into contact with the installation surface. Therefore, it is possible to prevent the contents 10 from leaking from the ventilation portion 6b by heating the package 1 in a state where the ventilation portion 6b is arranged at the bottom of the storage portion 9.

In addition, a symbol capable of distinguishing the vertical direction of the storage portion 9 may be provided on the three surfaces of the side surface 4a, the side surface 4b, and the side surface 4c. When the back seal portion 7 is formed only on the bottom surface 3, the storage portion 9 is provided on two surfaces including the three non-formed surfaces (4a, 4b, 4c) of the back seal portion 7 or the front side surface 4a. It is advisable to provide a symbol that can distinguish the vertical direction.

An opening notch (V notch) 6a is provided at the center of the top seal portion 6 in the extending direction. Further, the ventilation portion 6b is located above the opening notch 6a. By arranging the steaming section 6b above the storage section 9, even if more contents 10 are stored in the storage section 9, the contents 10 are prevented from leaking through the steaming section 6b during cooking. can do.

FIG. 3 is a developed view of the package 1, and the package 1 is formed from one rectangular blank sheet 102. As will be described later, the blank sheet 102 is heat-bonded to form the side surfaces 4a to 4c and the bottom surface 3 into substantially the same triangular shape. Further, a bottom seal portion 5, a top seal portion 6, and a back seal portion 7 are arranged so as to surround the bottom surface 3 and the side surfaces 4a to 4c. The side surface 4a and the bottom surface 3 are partially divided and arranged. Further, the side 11 that connects the bottom surface 3 and the side surface 4a, the side 12 that connects the bottom surface 3 and the side surface 4b, the side 15 that connects the side surfaces 4a and 4c, and the side 16 that connects the side surfaces 4b and 4c are stored in a tetrahedral shape. It is a ridge line when 9 is formed.

Further, the blank sheet 102 has a linear easy tearing property (straight line tearing property) in the extending direction of the back seal portion 7. This easy tearing direction coincides with the MD direction (vertical direction: Machine Direction = film flow direction), and the tear propagation resistance value in the MD direction is compared with the TD direction (horizontal direction: Transverse Direction = film width direction). Is small.

The easy tearing direction (MD direction) extends in the direction orthogonal to the extending direction of the top seal portion 6 on the side surfaces 4a and 4b where the top seal portion 6 is one side in the package 1 of FIG. Further, the side surface 4c and the bottom surface 3 having the bottom seal portion 5 as one side extend in a direction orthogonal to the extending direction of the bottom seal portion 5. Therefore, when the side surfaces 4a and 4b are torn straight from the opening notch 6a of the top seal portion 6 in the easy tearing direction, the tear lines reach both ends of the bottom surface (inner edge 13) of the side surface 4c.

FIG. 4 is a cross-sectional view showing a laminated structure of the laminated film 2 constituting the blank sheet 102. The laminated film 2 is a laminated body in which an outer layer 22 and an inner layer 23 made of a heat-adhesive (thermoplastic) resin layer are laminated.

Since the outer layer 22 is a basic material constituting the package 1, a synthetic resin film having excellent mechanical, physical, chemical, etc. properties can be used, for example, polyester-based, polyamide-based, and the like. A resin such as polypropylene can be used. The thickness of the film constituting the outer layer 22 may be determined in consideration of cost and the like, but is appropriately about 12 to 25 μm.

As a specific example of the outer layer 22, a simple substance such as a uniaxially stretched nylon film, a biaxially stretched nylon film, a polypropylene film (OPP), a polyester resin film, or a laminate thereof is used. Specific materials of the polyester resin film include, for example, polyethylene terephthalate resin (PET), polybutylene terephthalate resin, polyethylene-2,6-naphthalate resin, polybutylene-2,6-naphthalate, polycyclohexanedimethylene terephthalate resin and the like. Various polyester-based resins can be used.

The outer layer 22 is formed with a print layer (not shown) to which a desired print pattern such as characters, figures, symbols, and patterns, which is a pattern capable of distinguishing the vertical direction of the storage portion 9, is added. The printing layer is formed by printing a desired printing pattern on the back surface of the outer layer 22 by a printing method such as gravure printing, offset printing, letterpress printing, screen printing, transfer printing, flexo printing, etc. using the ink composition.

The ink composition contains one or more of ordinary ink vehicles as main components, and if necessary, a plasticizer, a stabilizer, an antioxidant, a light stabilizer, an ultraviolet absorber, a curing agent, a cross-linking agent, and a lubricant. , Antistatic agent, filler, etc. 1 or 2 or more are arbitrarily added, and colorants such as dyes and pigments are further added, and the mixture is sufficiently kneaded with a solvent, a diluent, etc. to prepare. ..

The inner layer 23 is a layer made of a heat-adhesive (thermoplastic) resin, which is melted by heat to fuse the laminated film 2. Examples of the heat-adhesive resin used for the inner layer 23 include low-density polyethylene (LDPE), medium-density polyethylene, high-density polyethylene, linear (linear) low-density polyethylene (LLDPE), polypropylene (CPP), and a vapor-deposited layer. Polypropylene (VMCPP) provided with (silica, alumina, aluminum, etc.), ethylene-α-olefin copolymer, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, Ester copolymer of ethylene and acrylic acid ester, ethylene-methacrylic acid copolymer, ethylene-propylene copolymer, methylpentene polymer, polyolefin resin (polyethylene, polypropylene, etc.) and unsaturated carboxylic acid (acrylic acid, methacrylic acid, etc.) One or more selected from acid-modified polyolefin-based resins modified with maleic anhydride, fumaric acid, etc.) can be used.

The layer thickness of the inner layer 23 may be appropriately determined in consideration of required physical properties (heat sealability), cost, etc., and is preferably about 10 μm to 100 μm, particularly preferably about 15 μm to 50 μm. As a method for forming the inner layer 23, a method of laminating a single layer or a multilayer film of the thermosetting resin described above or a method of laminating the thermosetting resin by a melt extrusion method is used.

Further, by using a stretched uniaxially stretched film for at least one layer of the outer layer 22 and the inner layer 23, the tear propagation resistance value of the laminated film 2 in the tearing direction is reduced and the tearability of the laminated film 2 is improved. Can be done. In particular, the thermosetting resin constituting the inner layer 23 tends to become sticky by heating, and the tearability tends to decrease. Therefore, it is preferable to use a uniaxially stretched film for the inner layer 23 to improve the tearability, particularly in the case of cooking while the contents 10 are filled in the package 1.

As a method for producing the laminated film 2, a laminating method used when producing a normal packaging material, for example, a dry lamination method, a wet lamination method, a solvent-free lamination method, a coextrusion lamination method, an inflation method, or the like can be used. it can.

Further, if necessary, when laminating each of the above layers, pretreatments such as corona discharge treatment, ozone treatment, frame treatment, and blast treatment can be arbitrarily applied to the surface of the base material to be laminated.

FIG. 5 is a plan view of a long laminated film 2 in which blank sheets 102 are connected. In the method of manufacturing the package 1, first, a long laminated film 2 in which a plurality of blank sheets 102 are connected at the bottom seal portion 5 and the top seal portion 6 is set in the filling machine.

The laminated film is formed in the easy tearing direction (MD direction) in a direction parallel to the back seal portion 7. Further, the adjacent blank sheets 102 are arranged so that the bottom surface 3 and the side surfaces 4a to 4c are symmetrical in the MD direction with the bottom seal portion 5 or the top seal portion 6 interposed therebetween.

Next, while sequentially feeding out the laminated film 2 from the tip, the back seal portions 7 are continuously heat-bonded to each other by bending them in the width direction (vertical direction in FIG. 3) so that the inner layers 23 face each other. By heat-bonding the back seal portion 7, the divided bottom surface 3 and the side surface 4a are joined.

Next, both ends of the side surface 4c arranged on a straight line extending from the opening notch 6a in the easy tearing direction (MD direction) to the bottom seal portion 5 of the laminated film 2 which is formed by heat-bonding the back seal portion 7 to form an annular shape. It is bent at a portion (position of arrow B in FIG. 3), overlapped so that the inner layers 23 face each other, and heat-bonded. Next, a predetermined amount of the content 10 (here, solid frozen food) is filled from the remaining unsealed portion (top-sealed portion 6) on one side.

After that, the top seal portion 6 and the top seal portion 6 of the next package 1 are bent at both ends of the side surface 4b (positions indicated by arrows A in FIG. 3), overlapped so that the inner layers 23 face each other, and heat-bonded at the same time. , A tetrahedral-shaped storage portion 9 is formed. At this time, the bottom seal portion 5 and the top seal portion 6 are twisted by 90 ° and face each other.

Finally, the space between the top seal portions 6 is cut by a slitter to form the package 1 as shown in FIG. Therefore, in the next package 1, the content 10 is filled from the bottom seal portion 5, which is an unsealed portion. After that, the above procedure is repeated to continuously form the package 1.

The thermal bonding method can be, for example, a known method such as a bar seal, a rotary roll seal, a belt seal, an impulse seal, a high frequency seal, or an ultrasonic seal.

FIG. 6 is a perspective view showing a state of the package 1 after opening. The package 1 shown in FIG. 1 is torn from the opening notch 6a of the top seal portion 6. As a result, the side surfaces 4a and 4b continuous with the top seal portion 6 are smoothly torn along the easy tearing direction (MD direction) of the laminated film 2.

Further, when the opening 9a is expanded in the direction in which both ends of the cut top seal portion 6 are separated, the breaking line due to tear reaches both ends of the bottom seal portion 5 and the breaking of the storage portion 9 is stopped. This forms a boat-shaped container with a large opening 9a at the top. The bottom 9c of the container is formed by the bottom surface 3 and the side surface 4c, and the side wall 9b of the container is formed by the side surfaces 4a and 4b and a part of the bottom surface 3 and the side surface 4c. As a result, the package 1 can be heated in a microwave oven to cook the contents 10 and then the package 1 after opening can be used as a container (dish), and the convenience of the package 1 is improved.

According to the present embodiment, the two sides of the tetrahedral-shaped storage portion 9 twisted by 90 ° and opposed to each other are adhered by the top seal portion (first seal portion) 6 and the bottom seal portion (second seal portion) 5, and the top seal is formed. The portion 6 is provided with a ventilation portion 6b that communicates the storage portion 9 with the outside when the internal pressure inside the storage portion 9 reaches a predetermined pressure. Since the tetrahedral-shaped storage portion 9 is stable and self-supporting, it is possible to prevent the packaging body 1 from tipping over. Further, by placing the package 1 in a microwave oven and heating it so that the top seal portion 6 extends in the vertical direction of the storage portion 9, the content 10 leaks through the steaming portion 6b during cooking. Can be prevented.

Further, when the storage portion 9 is broken from the central portion of the top seal portion 6 and both ends of the broken top seal portion 6 are expanded in a direction away from each other, the opening 9a reaches both ends of the bottom seal portion 5 and the package 1 is formed. It is opened in a boat shape. As a result, the package 1 can be used as a container after opening, and the convenience of the package 1 is improved.

Further, by providing a symbol capable of distinguishing the vertical direction of the storage portion 9 on the side surfaces 4b and 4c which are non-formed surfaces of the back seal portion (third seal portion) 7, the upper and lower sides of the storage portion 9 are used as a mark. Authorize the direction. Therefore, the user can be guided to install the package 1 in the microwave oven in an upright state.

This makes it possible to prevent the user from accidentally installing the package 1 in the microwave oven so that the side surface 4a comes into contact with the installation surface. Therefore, it is possible to prevent the contents 10 from leaking from the ventilation portion 6b by heating the package 1 in a state where the ventilation portion 6b is arranged at the bottom of the storage portion 9.

Further, the ventilation portion 6b is located above the central portion in the extending direction of the top seal portion 6. By arranging the steaming portion 6b above the storage portion 9, it is possible to prevent the contents 10 from leaking through the steaming portion 6b during cooking while storing more contents 10 in the storage portion 9. be able to.

Further, when the packaging body 1 is installed so that the bottom seal portion 5 is in contact with the installation surface by forming the heat adhesion width of the bottom seal portion 5 larger than the heat adhesion width of the top seal portion 6, the storage portion 9 Independence stability is further improved. Further, it is possible to prevent the inner layer 23 of the bottom seal portion 5 from being peeled off before the ventilation portion 6b and the contents 10 from leaking when the internal pressure rises.

Further, in the ventilation portion 6b, the inner edge 14 facing the storage portion 9 of the top seal portion 6 extending in a band shape is formed in a convex curved shape in the direction away from the storage portion 9, and the distance from the outer edge facing the outside air is partly It is narrowed and formed. As a result, when the internal pressure in the storage portion 9 rises, the internal pressure is concentrated in the convex curved recess 61 of the inner edge 14. Therefore, when the internal pressure in the storage portion 9 reaches a predetermined pressure, the inner layer 23 that has been heat-bonded from the recess 61 is first peeled off, and the storage portion 9 and the outside communicate with each other. As a result, the contents 10 can be cooked while the steam generated from the contents 10 is discharged from the steaming section 6b to the outside to prevent the storage section 9 from bursting.

Further, since the easy tearing direction (MD direction) of the laminated film 2 is arranged in the direction parallel to the extending direction of the back seal portion 7 (third seal portion), the laminated film 2 is laminated with the central portion of the top seal portion 6 as the opening starting point. The storage portion 9 can be smoothly torn along the easy tearing direction (MD direction) of the film 2. Therefore, the package 1 can be easily opened to form a boat-shaped container.

Further, by providing the opening notch 6a (opening starting means) at the central portion of the top seal portion (second seal portion) 6 in the extending direction, the package 1 can be easily opened and the convenience is further improved. be able to.

<Second Embodiment>
Next, the second embodiment of the present invention will be described. FIG. 7 is a side view of the package 1 of the second embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 6 are designated by the same reference numerals. In the present embodiment, the shape of the ventilation portion 6b is different from that of the first embodiment. Other parts are the same as those in the first embodiment.

The ventilation portion 6b has a rectangular convex portion 62 on a part of the inner edge 14 of the top seal portion 6 extending in a band shape. The convex portion 62 projects toward the inside of the storage portion 9 in a direction substantially orthogonal to the extending direction of the top seal portion 6. Further, in the convex portion 62, the distance between the inner edge 14 and the outer edge facing the outside air is narrowed.

When the internal pressure in the storage portion 9 rises, the internal pressure concentrates on the convex portion 62. Therefore, when the internal pressure in the storage portion 9 reaches a predetermined pressure, the inner layer 23 that is first heat-bonded from the convex portion 62 is peeled off, and the storage portion 9 and the outside communicate with each other. As a result, the contents 10 can be cooked while the steam generated from the contents 10 is discharged from the steaming section 6b to the outside to prevent the storage section 9 from bursting.

Further, FIG. 8 is a side view showing a modified example of the package 1 of the second embodiment, in which the convex portion 62 projecting in the internal direction of the storage portion 9 has a triangular shape, and the peripheral edge of the convex portion 62 is the top seal portion. It is formed so as to be inclined at an obtuse angle with respect to the extending direction of 6. By changing the shape of the convex portion 62, it is possible to change the internal pressure at which the inner layer 23 begins to peel off when the internal pressure inside the storage portion 9 rises.

<Third Embodiment>
Next, a third embodiment of the present invention will be described. FIG. 9 is a side view of the package 1 of the second embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 6 are designated by the same reference numerals. In the present embodiment, the shape of the ventilation portion 6b is different from that of the first embodiment. Other parts are the same as those in the first embodiment.

The communicating portion 6b has a protruding portion 63 and a communicating portion 64. The projecting portion 63 is formed so that the inner edge 14 of the top seal portion 6 facing the accommodating portion 9 projects toward the inside of the accommodating portion 9. Further, the communication portion 64 is provided close to the inner edge of the protrusion 63, the communication portion 64 is formed by a through hole penetrating the blank sheet 102, and the communication portion 64 communicates with the outside of the storage portion 9. Further, a part of the inner edge of the protruding portion 63 is formed with a concave portion 64a recessed toward the communicating portion 64.

When the internal pressure in the storage portion 9 rises, the internal pressure concentrates on the concave portion 64a. Therefore, when the internal pressure in the storage portion 9 reaches a predetermined pressure, the inner layer 23 that is first heat-bonded from the concave portion 64a is peeled off and communicates with the communication portion 64. As a result, the steam generated from the content 10 can be discharged from the communication portion 64 to the outside to prevent the storage portion 9 from bursting, and the content 10 can be cooked by heating.

<Fourth Embodiment>
Next, a fourth embodiment of the present invention will be described. FIG. 10 is a cross-sectional view showing the layer structure of the laminated film 2 constituting the package 1 of the fourth embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 6 are designated by the same reference numerals. In the present embodiment, the barrier layer 24 is provided between the outer layer 22 and the inner layer 23. Other parts are the same as those in the first embodiment.

For the barrier layer 24, it is preferable to use a material having excellent vapor barrier property and gas barrier property when the enclosed content 10 is easily deteriorated by water or oxygen. Specifically, resin films such as ethylene / vinyl alcohol copolymer (EVOH), polyvinylidene chloride (PVDC), polyacrylonitrile (PAN), biaxially stretched polyethylene terephthalate (PET), and biaxially stretched polypropylene (OPP) are used. Can be used. Further, a vapor-deposited layer (silica, alumina, aluminum, etc.), a metal foil (aluminum, etc.), a coating layer (polyvinylidene chloride, etc.) having a barrier property on a base material layer made of a resin film such as polyethylene terephthalate and biaxially stretched nylon. ) Etc. may be provided.

Since the film provided with the aluminum foil or the aluminum vapor deposition layer is opaque, it can also serve as a light-shielding layer. As the aluminum foil used for the barrier layer 24, an annealed aluminum foil is suitable, and the thickness thereof is about 6 to 15 μm.

Further, a biaxially stretched nylon film used as the outer layer 22, a vapor-deposited layer of silica, alumina, aluminum or the like, or a coating layer of polyvinylidene chloride, ethylene / vinyl alcohol copolymer (EVOH) or the like is provided on the back surface of the polyester resin film. It may be provided as a barrier layer 24.

Further, as the outer layer 22, a nylon / EVOH / nylon laminated film, a nylon / metaxylylene diamine / adipic acid copolymer (MXD) / nylon laminated film, or the like may be used to form a barrier property in a multilayer structure. ..

It should be noted that the physical properties required for the package 1, for example, mechanical toughness, bending resistance, piercing resistance (pinhole resistance), impact resistance, cold resistance, heat resistance, chemical resistance, etc. are imparted. Therefore, these materials having excellent physical properties may be used for the barrier layer 24.

Specifically, a stretched film of polyolefin such as polyester, polyamide, polyethylene, polypropylene, or ethylene-propylene copolymer can be used.

Further, by using a film having high heat resistance as the laminated film 2, it is possible to cook the contents 10 in a state of being filled in the package 1. For example, the contents 10 can be boiled by putting the unopened package 1 in boiling water.

Further, by using the laminated film 2 which does not contain a metal layer as the barrier layer 24 and has a melting point of 100 ° C. or higher, cooking by heating in a microwave oven is also possible. In this case, in order to prevent the package 1 from bursting due to an increase in the internal pressure during heating, a small hole may be formed in the storage portion 9 by slightly breaking the side surfaces 4a and 4b from the top seal portion 6.

Further, the barrier layer 24 may be formed by laminating a plurality of the above-mentioned base materials listed as the barrier layer 24. Further, by using a stretched uniaxially stretched film for at least one layer of the outer layer 22, the inner layer 23, and the barrier layer 24, the tear propagation resistance value of the laminated film 2 in the tearing direction is reduced, and the tearability of the laminated film 2 is reduced. Can be improved.

Others The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above embodiment, the opening notch 6a is formed by the V notch as the opening starting means, but an I notch or a U notch may be used instead of the V notch. Further, instead of the opening notch 6a, the top seal portion 6 may be provided with a scar group region composed of a plurality of fine puncture holes.

Further, the top seal portion 6 may be provided with a print mark for guiding the user to start opening the central portion of the top seal portion 6 without providing the opening start means. The user can open the package 1 so as to form a boat-shaped container by forming a notch in the center of the top seal portion 6 with scissors or the like using the print mark as a mark to form a starting point for opening. Further, the end surface of the top seal portion 6 may be formed in a saw shape, and a plurality of opening notches (V notches) 6a may be arranged side by side in each extending direction. In this case, the user can open the package 1 at an arbitrary position, and the user can freely select the size of the opening 9a.

Hereinafter, the effects of the present invention will be described in more detail with reference to Examples.

A silica-deposited polyethylene terephthalate film (IBPET-RB, manufactured by Dai Nippon Printing Co., Ltd.) having a thickness of 12 μm is used as the outer layer 22, and after laminating a dry laminate layer on the outer layer 22 (silica vapor-deposited layer), the barrier layer 24 is thick. A 15 μm biaxially stretched nylon film (ONMBCRT, manufactured by Unitika Ltd.) was laminated. Next, after laminating a dry laminate layer on the surface of the barrier layer 24, a non-stretched polypropylene film (NewExp-rt, manufactured by Dai Nippon Printing Co., Ltd.) having a thickness of 50 μm was laminated as an inner layer 23 to produce a laminated film 2.

Using this laminated film 2, a regular tetrahedron-shaped package 1 having a side of 15 cm as shown in the first embodiment of FIG. 1 was manufactured. The easy tearing direction of the laminated film 2 was arranged parallel to the extending direction of the back seal portion 7. The top seal portion 6, the bottom seal portion 5, and the back seal portion 7 are formed by heat-bonding in a band shape with a seal width of 10 mm, and a ventilation portion 6b is provided at the central portion of the top seal portion 6 in the extending direction. The ventilation portion 6b is composed of a recess 61 having a width of 10 mm and protruding 4 mm in a direction away from the storage portion 9.

The laminated film 2 according to the second embodiment has the same layer structure as that of the first embodiment, and the packaged body 1 of the second embodiment having the same shape as that of the first embodiment is manufactured by using the laminated film 2 except for the ventilation portion 6b. did. The ventilation portion 6b is formed by a rectangular convex portion 62 (see FIG. 7). The convex portion 62 has a width of 10 mm and protrudes 4 mm in the internal direction of the storage portion 9, and the outer edge of the top seal portion 6 facing the convex portion 62 also has a width of 4 mm and protrudes 4 mm in the internal direction of the storage portion 9. Has been done.

The laminated film 2 according to the third embodiment has the same layer structure as that of the first embodiment, and the laminated film 2 is used to manufacture the package 1 of the second embodiment having the same shape as that of the first embodiment except for the ventilation portion 6b. did. The ventilation portion 6b is formed by a triangular convex portion 62 (see FIG. 8). The convex portion 62 has a width of 10 mm and protrudes 4 mm in the internal direction of the storage portion 9, and the outer edge of the top seal portion 6 facing the convex portion 62 also has a width of 4 mm and protrudes 4 mm in the internal direction of the storage portion 9. Has been done.

The laminated film according to the fourth embodiment had the same layer structure as that of the first embodiment, and the packaged body 1 of the third embodiment having the same shape as that of the first embodiment was manufactured by using this laminated film. The communicating portion 6b has a protruding portion 63 and a communicating portion 64 (see FIG. 9). The protruding portion 63 has a width of 10 mm and protrudes 4 mm in the internal direction of the storage portion 9. The communicating portion 64 is a through hole having a diameter of 2 mm, and the lower side of the protruding portion 63 is formed with a concave portion 64a having a width of 10 mm that is recessed toward the communicating portion 64. As a result, the concave portion 64a and the communication portion 64 are arranged close to each other by 2 mm.

[Comparative Example 1]
The laminated film according to Comparative Example 1 had the same layer structure as that of Example 1, and a package having the same shape as that of Example 1 was manufactured using this laminated film. The package according to Comparative Example 1 is not provided with the ventilation portion 6b.

The cooking suitability of the packages 1 of Examples 1 to 4 and the packages of Comparative Example 1 was evaluated.

To evaluate the suitability for cooking, five 5 g shumai dumplings were stored inside the package 1 of Examples 1 to 4 and the package of Comparative Example 1, and the package 1 was placed upright on a tray in a microwave oven. After the installation and cooking at 600 w while rotating the tray for 2 minutes, it was visually evaluated whether or not the contents 10 leaked. The evaluation results are also shown in Table 1. In Table 1, the case where steam is discharged and the leakage of the content 10 is not confirmed is indicated by ⊚, and the case where the leakage of the content is confirmed is indicated by ×.

As is clear from Table 1, the package 1 of Examples 1 to 4 did not tip over on the tray during heating. Further, in the package 1 of Examples 1 to 4, steam was discharged to the outside from the ventilation portion 6b during heating, and no leakage due to the spillage of the contents 10 was confirmed. On the other hand, in the package of Comparative Example 1, a part of the bottom seal portion 5 burst and steam was discharged to the outside, and a small amount of leakage of the contents was confirmed along with the discharge of steam.

The present invention can be used for a package in which foods and the like can be cooked.

1 Package 2 Laminated film 3 Bottom surface 4a-4c Side surface 5 Bottom seal part (second seal part)
6 Top seal part (1st seal part)
7 Back seal part (3rd seal part)
9 Storage part 9a Opening port 9b Side wall surface 9c Bottom part 10 Contents 22 Outer layer 23 Inner layer 24 Barrier layer 61 Recessed 62 Convex part 63 Protruding part 64 Communication part

Claims (12)

A package for microwave oven heating, which is formed of a laminated film having at least an outer layer and an inner layer made of a thermosetting resin, and is heated by a microwave oven .
A tetrahedron-shaped storage unit for storing the contents,
A first seal portion and a second seal portion in which the inner layers are heat-bonded to each other along two opposite sides of the storage portion twisted by 90 °,
A third seal in which the first seal portion and the second seal portion are connected and extended, and one end portion extends in a direction orthogonal to the first seal portion or the second seal portion to thermally bond the inner layers to each other. Has a part and
The packaging body is characterized in that the first seal portion is provided with a ventilation portion that communicates the storage portion with the outside when the internal pressure in the storage portion reaches a predetermined pressure. The package according to claim 1, wherein a symbol capable of distinguishing the vertical direction of the storage portion is provided on the non-formed surface of the third seal portion. The package according to claim 2, wherein the ventilation portion is located above the central portion in the extending direction of the first seal portion. The package according to any one of claims 1 to 3, wherein the heat-bonding width of the second seal portion is larger than the heat-bonding width of the first seal portion. The inner edge of the first seal portion extending in a band shape and facing the storage portion is formed in a curved shape that is convex in a direction away from the storage portion, and the distance between the inner edge and the outer edge facing the outside air is one. The package according to any one of claims 1 to 4, wherein the package is formed by narrowing a portion. The ventilation portion is formed so that the inner edge of the first seal portion extending in a band shape and facing the storage portion projects toward the inside of the storage portion and the distance between the inner edge and the outer edge facing the outside air is partially narrowed. The package according to any one of claims 1 to 4, wherein the package is characterized by the above. The ventilation portion includes a protrusion whose inner edge facing the storage portion of the first seal portion extending in a band shape protrudes in the internal direction of the storage portion and a communication portion which is close to the inner edge of the protrusion and communicates with the outside. The package according to any one of claims 1 to 4, wherein the package is made of. Both ends of the third seal portion extend in a direction orthogonal to the first seal portion and the second seal portion.
The package according to any one of claims 1 to 7, wherein the laminated film has an easily tearable property in a direction parallel to the extending direction of the third seal portion. The package according to claim 8, wherein an opening start means is provided at a central portion in the extending direction of the first seal portion. The package according to claim 8 or 9, wherein at least one layer constituting the laminated film is a uniaxially stretched film stretched in the extending direction of the third seal portion. The package according to claim 10, wherein the inner layer is a uniaxially stretched film stretched in the extending direction of the third seal portion. The package according to any one of claims 1 to 11, wherein a barrier layer having a gas barrier property is provided between the outer layer and the inner layer.

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