JPH11314627A - Pollution-free heat-insulating container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pollution-free heat-insulating container for an instant noodle or the like, wherein styrene does not elute even when hot water is poured, and which is equipped with an air heat-insulating layer on the container wall, and is safe. SOLUTION: In this heat-insulating container, between a container internal layer 1 and a container external layer 2 which respectively have a cup-shape, as a spacer, an intermediate layer 3, which can be inserted between the internal layer 1 and the external layer 2, has a cup-shape, and wherein a plurality of bowl-shape uneven parts 3u which orient in the direction to the center of the container bottom part, are formed with a height of 6-2 mm, is pinched, and flange parts 13 , 23 which are respectively formed on the internal layer and the external layer of the peripheral edge of the opening of the container, are heat-welded or bonded to each other. By this method, between the internal layer 1 and the external layer 2, an air heat-insulating layer of 6 mm or lower, where air does not perform a convection, is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulated container such as a container for cup noodles and a fish box (filtration box), and more particularly, to an endocrine disrupter when a conventionally used container made of styrene foam is used in boiling water. (Styrene monomer)
The present invention relates to a non-polluting heat-insulating container that eliminates pollution caused by elution of insolubles or incineration and disposal.

[0002]

2. Description of the Related Art Conventionally, a large amount of cup noodles has been used as an instant food, and the production volume in Japan in 1996 was 28 per year.
There are 111 million servings, and cup noodle containers are insulated containers for heat insulation when the content food is used, and there are some paper containers, but 90% of them are made of styrene foam. On the other hand, most fish boxes (toro boxes) are made of polystyrene foam for heat insulation during cooling or frozen transportation.

[0003]

The styrofoam cup noodle container contains environmental hormones such as styrene in its material. It has recently been shown that these endocrine disruptors disrupt human endocrine system at levels of only one trillionth of a trillion and seriously affect reproductive functions such as halving sperm. At present, 70 types of environmental hormones, including dioxin, are known to have an adverse effect on the human body, and one of the familiar ones is "styrene".

[0004] Safety standard values have been set for styrene.
5000 ppm (ppm is a concentration of 1 / million). When pouring hot water, the content should be 2000 ppm or less.
However, in addition to ppm, the concentration of pp
It is said that environmental hormones act in units of t. In Europe and the United States, where regulations are actually in progress, some countries, such as the Netherlands, have banned the use of polystyrene foam containers. In Europe, where the industry is the most regulated, the cup noodles are sold using highly safe materials called polypropylene, unlike styrene foam made in Japan. And experts on chemical poisons at the table about the dangers of styrene, "Styrene is weak to heat, and it dissolves in boiling water at 70 to 95 degrees Celsius, and if you pour boiling water into the cup, the chemical substances contained in the material will melt out" Points out.

[0005] The results of the styrene dissolution experiments were described for each of the products currently on the market by placing 200 ml of boiling water in a container of cup noodles from which the contents had been taken out, closing the lid with aluminum foil, and after 5 minutes GCMS (minutes). It was also reported that the styrene concentration in water (ppb) was 33-1 for all 12 types of products investigated as a result of experiments at the Yokohama National University Environmental Science Research Center using the method of "detecting with a folding device". ing. On the other hand, Styrofoam fish boxes from which fish have been taken out are disposed of by incineration.However, a large amount of black smoke is emitted during incineration, and there is a problem that it cannot be burned at fish markets, etc. I had to do it. Further, there is a problem that the incinerator is seriously damaged by a large amount of heat generated at the time of incineration.

The present invention has been made in view of such circumstances, and even when boiling water is poured into a container for cup noodles, styrene, which is a kind of environmental hormone, is not eluted at all, and environmental hormone pollution can be prevented. It can be used as a heat insulation container for fish boxes, does not generate black smoke during disposal after use, does not require transportation and incineration at incineration plants, and can be incinerated at fish markets, etc., and can save transportation and incineration costs. It is another object of the present invention to provide a non-polluting heat-insulating container that does not cause incineration burn even in an incineration plant.

[0007]

In order to achieve the above-mentioned object, in the pollution-free heat insulating container of the present invention, 20 to 80% of cellulose powder such as paper powder and wood powder and 80 to 80% of polyolefin synthetic resin are used. A container inner layer and a container outer layer each having a small thickness are formed from a mixed material of 20%, and an air layer of 6 mm or less and 2 mm or more is held between the container inner layer and the container outer layer. At the periphery, a heat insulating layer of 6 mm or less is formed between the inner layer and the outer layer by heat welding or bonding to each other.

In the above structure, the air heat insulating layer of 6 mm or less is formed between the inner layer of the container and the outer layer of the container because the air is viscous and convection occurs in the gap of 6 mm or less. The advantage is that heat conduction is prevented. As for the effect of holding the air layer, a product in which a 6 mm air layer is held between a pair of 1 mm thick glass plates as a heat insulating glass by Asahi Glass Co., Ltd. is commercially available.
The heat insulation effect has been confirmed. The inner and outer layers of the container are 2
Since it is formed from a mixed material of 0 to 80% of cellulose powder and 80 to 20% of polyolefin-based synthetic resin, it has water resistance and low thermal conductivity, and this container is good in combination with the air insulating layer. It is an insulated container. In addition, since the cellulose powder can be produced by drying and pulverizing waste paper, waste material, and the like, it can be formed at low cost, and the cost of the container can be reduced.

Since the container is made of a mixed material of cellulose powder and a polyolefin-based synthetic resin as described above, it differs from a conventional container made of styrene foam even if hot water is poured into the container. Styrene is not eluted at all, and there is no risk of environmental hormone pollution.

In forming the pollution-free heat insulating container,
When the container is a cup-shaped container, each is a cup-like shape that can be inserted between the inner layer and the outer layer as a spacer between the inner layer of the cup-shaped container and the outer layer of the container and that is oriented toward the center of the container bottom at the center. The intermediate layer, which has a plurality of irregularities with the height of the irregularities of 6 mm or less and 2 mm or more, is held, and heat welded to each other by the flanges formed outward on the inner and outer layers of the container around the opening of the container. Alternatively, it is effective to adopt a configuration in which a container heat insulating layer of 6 mm or less is formed between the inner layer and the outer layer by bonding. With this, the inner layer, outer layer, and intermediate layer of the container are formed from a flat sheet-like material by vacuum molding or air-pressure molding using a mold on only one side. Thus, a cup-shaped heat-insulating container can be easily formed by molding at low cost.

In forming the pollution-free heat insulating container,
When the container is a thin-walled cup-shaped two-layer container whose bottom diameter is slightly smaller than the caliber, a radial rib of 6 mm or less in height and a thin wall is formed on the outer periphery of the inner layer of the container, and the outer layer of the container is a container. A container in which the inner layer of the container can be accommodated in a contact state at the rib tip of the inner layer, and the outer peripheral portion of the thin-walled bottom portion is formed integrally with the lower end portion of the outer layer in the form of a reinforcing rib in the downward direction. A gap of 6 mm or less was provided between the inner layer and the outer layer of the outer peripheral portion and the bottom surface, respectively, and flange portions formed outwardly on the container inner layer and the container outer layer at the periphery of the container opening were thermally welded or bonded to each other. It is good to take a configuration.

[0012] Accordingly, even in the case of a cup-shaped two-layer container where the container depth is larger than the container diameter and the container inner layer and the container outer layer cannot be formed by vacuum forming or pressure forming from the material sheet, injection molding or the like can be performed. Using an inner layer with radial ribs on the outer circumference, an outer layer without ribs,
And a bottom member having a downward rib at the edge of the disk to be attached to the outer layer, and a cup-shaped member having an air insulation layer of 6 mm or less between the outer layer and the inner layer on the outer periphery and the inner layer of the container. The heat insulating container can be easily formed.

On the other hand, when forming a large non-polluting heat-insulating container for fish boxes, which is a large heat insulating container, 20 to 80% of cellulose powder such as paper powder and wood powder and 80 to 80% of polyolefin synthetic resin are used. 20% of the mixed material can be inserted between the inner and outer layers of the container inner and outer layers, each having a thin or thick container opening having a square or rectangular box frame shape.
A plurality of container intermediate layers, a double or multiple 6 mm air layer is formed between the container inner layer and the container outer layer via the container intermediate layer, and a container inner layer is formed around the container opening. It is effective to adopt a configuration in which flanges formed outwardly on the intermediate layer and the outer layer are formed by heat welding or bonding to each other.

Thus, a plurality of air layers in which no air convection occurs are formed between the inner layer, the intermediate layer and the outer layer of the container so that the opening of the container is wide and black smoke is emitted at the time of incineration disposal after use. It is possible to easily form a non-polluting heat-insulating container for a fish box that can be self-processed at a fish market or the like. Further, even if the incinerator is transported to an incineration plant without in-house treatment and incinerated, there is no risk of burning the incinerator due to high heat as in the case of a conventional styrene foam container.

In the heat insulating container for a fish box, the double formation of a 6 mm air layer in the inner layer and the outer layer of the container is such that ribs having a height of 6 mm are formed inside the container outer layer and inside the container outer layer, respectively. It is advisable to sandwich the container intermediate layer between them. Thereby, the inner layer and the outer layer of the container can easily and surely form a gap for the air layer between the inner layer and the intermediate layer by the respective ribs, and the strength of the inner layer and the outer layer can be enhanced by the ribs.

The formation of multiple 6 mm air layers between the inner layer and the outer layer of the insulated container for the fish box is achieved by forming a 6 mm-high rib inside each of the container outer layer and the container intermediate layer to form the inner layer of the container. The intermediate layer of the container may be formed by sequentially polymerizing and sandwiching the intermediate layer between the container and the outer layer of the container. This makes it possible to easily form multiple air layers of 6 mm between the inner layer and the outer layer of the container.

In forming the container inner layer and the container outer layer of the heat insulating container, it is effective to provide an extremely thin polypropylene layer on the inner surface of the inner layer or the outer surface of the outer layer. The polypropylene layer can further enhance the inherent water resistance of a thin-walled container inner layer or container outer layer formed from a mixed material of cellulose and a polyolefin-based synthetic resin. Further, when waste paper or recycled olefin is used as the material of the heat insulating container, an ultra-thin polypropylene layer is provided on the inner surface of the inner layer or the outer surface of the outer layer of the molded article, thereby isolating the packaged object from the waste paper or recycled olefin. be able to.

In providing the polypropylene layer on the inner surface or the outer surface of the inner layer of the container, when the inner layer or the outer layer of the container is formed from a sheet material, the polypropylene layer is extruded from an extrusion opening of a mixed material of cellulose and a polyolefin-based synthetic resin. By thinning a thin film of polypropylene immediately after extrusion on a thin sheet to be rolled, it is possible to provide an ultra-thin polypropylene layer on the inner surface or outer surface of the inner layer or the outer surface of the inner layer of the container in advance on the inner layer or outer layer of the container. it can. When the inner layer or the outer layer of the container is formed by injection, an ultrathin polypropylene film is inserted in advance in a corresponding portion of the injection mold, and the ultrathin polypropylene layer is formed on the inner surface of the inner layer of the container or the outer surface of the outer layer of the container by injection. Can be provided.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the pollution-free heat insulating container of the present invention will be described with reference to the accompanying drawings. FIG.
(A) is a vertical cross-sectional view passing through the central axis of the cup-shaped insulated container.
FIG. 1B is a cross-sectional view of the container taken along line XX.

The cup-shaped heat-insulating container is a cup-shaped heat-insulating container for accommodating instant noodles that can be poured into boiling water and eaten, and each is provided between a predetermined cup-shaped container inner layer 1 and a container outer layer 2. And an intermediate layer 3 that can be inserted between the inner layer and the outer layer as a spacer. The intermediate layer 3 has a plurality of (24 in the embodiment) corrugated uneven portions 3u having a height of 3 to 2 mm in order to secure an air insulating layer of 6 mm or less between the inner layer and the outer layer of the container. easy directed to the center direction of the container bottom is formed in a bowl shape as the bottom center in the center of the bottom of the cup-shaped intermediate layer to concentrate the uneven portions 3u in contact with the outer periphery of the outer layer bottom central Totsude unit 2 ₂ which will be described later A hole 3h is formed.

The container inner layer 1 is of a predetermined depth thin walled cup of the flange 1 ₃ with bottom side is Tsuboma' the outer circumference of a predetermined diameter, the bottom center of the bottom convex container outer layer 2 to be described later in the center outer layer bottom center Totsude 2 ₂ to hold the predetermined gap (3~2mm) to form the following air insulating layer 6mm from the output unit 2 ₂
Inner bottom center Totsude portion 1 ₂ is Totsude formed at a predetermined height in response to.

The container outer layer 2 accommodates the container inner layer 1 and the container intermediate layer 3 in a state where the wavy irregularities 3u of the intermediate layer 3 are in contact with the container inner layer and the container outer layer, respectively. is formed so as to hold the predetermined gap between the layers, and those bottom with a flange 2 ₃ on the outer circumference of a predetermined diameter is predetermined depth cup-shaped thin thickness of which Tsuboma', also serves as a reinforcement to the center of the bottom bottom central Totsude portion 2 _second lower height of a given diameter is formed in order to ensure stability when placing the container Te.

The container inner layer 1, container outer layer 2, and container intermediate layer 3 are each formed by kneading paper powder obtained by drying and pulverizing waste paper and a polyolefin-based thermoplastic resin (polyethylene, polypropylene, etc.) from a sheet extruder. The extruded sheet material is formed by molding and cooling using a single-sided die vacuum forming machine or a pressure forming machine.

[0024] In this way, the cup-shaped container outer layer 2 to the container intermediate layer 3 obtained, the container inner layer 1 are sequentially overlapped with an outer layer 2 upper outer periphery of the flange portion 2 ₃ the flange of the upper outer peripheral 1 of the inner layer 1 ₃ 6mm between inner layer and outer layer by heat welding or bonding
A cup-shaped non-polluting heat-insulating container provided with the following air heat-insulating layer can be formed.

Next, a description will be given of the formation of a cup-shaped heat-insulating container having a depth larger than the diameter of a container for accommodating instant noodles. FIG. 2A is a longitudinal sectional view of the cup-shaped heat insulating container passing through a substantially central axis, and FIG. 2B is a transverse sectional view of the container taken along line XX. This is made of the same material as the cup-shaped heat insulating container. The inner layer 1 is formed by injection molding because it is difficult to produce by vacuum or pressure forming, and the outer layer 2 is formed by the side wall.
And 2 ₁ and the bottom member 2b combine this by injection molding.

The container inner layer 1 is provided with a flange 1 ₃ on the outer circumference of a predetermined diameter, but a thin thickness depths deep cup-shaped with a flat bottom 1b of somewhat smaller diameter than the diameter, the outer periphery of the inner layer side wall 1 ₁ is the height 3～2Mm · thin radial ribs thickness is formed by eight equally dividing the circumference radially rib 1a of position quadrisected the circumference of which, the inner side wall 1 ₁ outer portion It is formed continuously to the outer part of the inner layer bottom part 1b, crosses in a cross shape on the back surface of the bottom part 1b, and has four other ribs, namely, four ribs 1a 'in the middle of the ribs at the positions where the circumference is divided into four equal parts. It is provided only on the outer portion of the inner side wall 1 _1.

The container outer layer 2 is formed so that the side wall 2 ₁ holds the following insulating air layer 6mm in inner and outer layers to accommodate in contact said vessel inner layer 1 at the tip portion of the rib 1a of the inner layer 1 are, and provided with a 2 ₃ on the outer periphery of the side wall opening, the outer layer side wall 2 ₁ reinforcing ribs 2b downwards 'disk-shaped bottom portion 2b is formed the rib 2b' thicker at portions on the periphery of a thin thickness It is formed integrally with the lower end.

[0028] Then container vessel inner layer 1, in contact with the respective inner surface of the inner layer side wall 1 ₁ outer periphery and the inner layer bottom rib 1a formed in the outer direction 1b, 1a 'containers outer layer 2 of the side wall 2 ₁ and the bottom member 2b Outer layer 2
Housed in, polymerizing upper outer peripheral flange portion 1 ₃ of the inner layer 1 to the flange portion 2 ₃ of the outer layer 2 upper periphery, by thermal welding or bonding, the inner layer 1 and the following air insulating layer 6mm between the outer layer 2 Thus, a cup-shaped non-polluting heat-insulating container provided with:

Next, a description will be given of an embodiment of a heat insulating container for a fish box having a large container opening in which a 6 mm air heat insulating layer is formed between the inner layer and the outer layer of the container. FIG. 3 (A) is a longitudinal sectional view of an insulated container for a fish box in which the opening of the container is rectangular and a 6 mm air insulation layer is formed between the inner and outer layers of the container, and FIG. 3 (B) is the container. It is a cross-sectional view by XX of FIG.

[0030] In the container, the container inner layer 1 is intended opening rectangular thin thickness of a predetermined depth with a flange 1 ₃ on the outer periphery of a predetermined rectangular outer surface and the bottom wall of the side wall 1 ₁ 11 A thin rib 1a with a height of 6 mm is provided on the outer surface of _1b at predetermined intervals (six on the short side of the rectangle, 10 + α on the long side), side walls
1 _1, the vertical direction and are formed in the bottom wall 1 ₁ b in a lattice shape.

The container outer layer 2, and a container intermediate layer 3 which will be described below with the container inner layer 1 can be accommodated in the polymerization conditions, opening of a predetermined rectangular outer periphery in a flange 2 ₃ a predetermined depth rectangular parallelepiped of which includes the those thin thickness, thin thickness of the ribs 2a of height 6mm in the inner surface of the side wall 2 ₁ of the inner side surface and the bottom wall 2 _1b is plural rows at predetermined intervals (Article 6 in the shorter sides of the rectangle, the long side In the 10 + α Article), the side wall 2 ₁
In the vertical direction, on the bottom wall _21b , in a lattice shape, and at opposing positions sandwiching the rib 1a of the inner layer 1 and the container intermediate layer 3.

The container intermediate layer 3, the respective ribs 1a of the container inner layer 1 and the container outer layer 2, sandwiched capable between 2a, a rectangular parallelepiped having a predetermined depth having an opening with a flange 3 ₃ on the outer periphery of a predetermined rectangular Of thin wall thickness.

The container inner layer 1, the container outer layer 2, and the container intermediate layer 3 are made of paper powder obtained by drying and pulverizing waste paper, and a polyolefin-based thermoplastic resin (polyethylene, Polypropylene or the like is kneaded, and the container inner layer 1 and the container outer layer 2 (including the container intermediate layer 3 in some cases) are produced by injection (injection molding). In this production, from the viewpoint of waterproof enhancement, an ultra-thin polypropylene film is inserted in advance on the inner surface of the container inner layer or the outer surface of the container outer layer of the injection mold, and at the time of injection molding, the extremely thin polypropylene film is formed on the inner surface of the container inner layer or the outer surface of the container outer layer. Form a polypropylene layer.
In addition, the intermediate layer 3 of the container may be manufactured by vacuum forming or pressure forming from a sheet of the kneaded mixed material instead of injection molding.

Instead of providing a polypropylene layer on the inner surface of the inner layer of the container or the outer surface of the outer layer of the container, the container inner layer 1, the container intermediate layer 3,
After the container outer layer 2 is bonded or heat-welded at the flange portion, a low molecular weight polypropylene resin may be coated on the inner or outer surface of the container to form a polypropylene thin film.

The container inner layer 1, the container outer layer 2, and the container intermediate layer 3 thus produced are held between the inner layer rib 1a and the outer layer rib 2a by contacting the container intermediate layer 3 with the rib tip. to as to overlay the inner layer, the intermediate layer, the flange portion of the opening portion of the outer layer 1 _3, 3 _3, 2 ₃ sequential polymerization, thermal welding or by bonding the container intermediate layer between the inner-outer layer of the container 6mm through 3
It is possible to form a non-polluting heat-insulating container for a fish box, which is provided with a double air heat-insulating layer.

FIG. 4 is a longitudinal sectional side view of one end of a fish insulated container in which a container opening is rectangular and a 6 mm air heat insulating layer is formed four times between the inner and outer layers of the container.

[0037] In the container, the container inner layer 1 is thin-walled rectangular parallelepiped having a predetermined depth having an opening with a flange 1 ₃ on the outer periphery of a predetermined rectangle (although an intermediate layer 3 ₁ which will be described later, 3 _2, 3 ₃ Unlike the container outer layer 2, since there is no rib, the thickness is slightly increased in order to prevent bending.)

The container outer layer 2, the container inner layer 1 and 3 the container intermediate layer 3 ₁ of Ke to be described later, 3 _2, 3 ₃ and capable of accommodating at polymerization conditions, the flange 2 ₃ opening on the outer periphery of a predetermined rectangular predetermined depth of rectangular parallelepiped thin thickness thin thickness of the ribs 2a of height 6mm in the inner surface of the side wall 2 ₁ of the inner side surface and the bottom wall 2 _1b in those having a can, plural rows at predetermined intervals, the side wall 2 ₁ in is formed in the same lattice shape as in the vertical direction and the bottom wall 2 in _1b FIG 3 (B).

The multiple 4's between the container inner layer 1 and the container outer layer 2
The three container intermediate layers 3 ₁ , 3 ₂ , 3 ₃ (referred to as 3 ₁ , 3 ₂ , 3 ₃ from the inside) which are inserted to form the air insulation layer, have openings each having a predetermined rectangular shape. the flange portion ₃₁₃ on the outer periphery of, 3 _23, each with three ₃₃ intended rectangular parallelepiped thin thickness of a predetermined depth, the inner surface and the bottom wall 3 _1b, 3 _2b, 3 _3b the inner surface of the respective side walls A plurality of ribs 3 _1a , 3 _2a , 3 _3a having a height of 6 mm are provided at predetermined intervals in the vertical direction on the side walls 3 ₁ , 3 ₂ , 3 ₃ , and on the bottom wall 3 _1b , 3
_2b, 3 and _3b in a lattice shape, and and at the same interval as the rib 2a of the outer layer 2 is formed on an extension of the inward of the rib 2a.

The container outer layer 2 and the container intermediate layer 3 ₁ , 3 ₂ , 3
₃ is prepared by injection (including the container inner layer 1 in some cases). At this time, in order to strengthen waterproofing,
Inserting an ultra-thin polypropylene film in advance on the inner surface of the container inner layer or the outer surface of the container outer layer of the injection mold, and forming the ultra-thin polypropylene layer on the inner surface of the container inner layer or the outer surface of the container outer layer by injection molding or the like as described above. It is. As for the inner layer 1 of the container, the inner layer 2 may be manufactured from a sheet of the kneaded mixed material by vacuum forming or pressure forming.

The container inner layer 1, container outer layer 2, and container intermediate layers 3 ₁ , 3 ₂ , 3 ₃ prepared as described above are combined with the side wall 11 _{1 of the} inner layer _1.
Polymerizing a flange portion 1 ₃ of the inner layer 1 to the intermediate layer 3 ₁ of the flange portion ₃₁₃ with polymerizing inner layer 1 and the intermediate layer 3 ₁ and the bottom wall 1 _1b and contacted ribs 3 _1a of the intermediate layer 3 ₁ and , the intermediate layer 3 _side wall and a bottom wall 3 _1b
Intermediate layer 3 ₁ and the intermediate layer contacted the ribs 3 _2a of the intermediate layer 3 ₂
3 ₂ polymerizing an intermediate layer 3 ₁ of the flange portion ₃₁₃ in the intermediate layer 3 ₂ of the flange portion 3 ₂₃ with the polymerized, the intermediate layer 3 ₂ of the side walls and the ribs 3 _3a of the bottom wall 3 _2b the intermediate layer 3 ₃ contact allowed intermediate layer 3 ₂ and the intermediate layer 3 _third intermediate layer 3 ₂ of the flange portion 3 ₂₃ intermediate layer 3 ₃ of the flange portion 3 along with the polymerizing
Polymerized _33, the intermediate layer 3 ₃ of the side wall and the bottom wall 3 the intermediate layer 3 _3b the contacted container outer ribs 2a ₃ and the intermediate layer together with the container outer layer 2 is polymerized 3 ₃ of the flange 3 ₃₃ containers outer layer 2 of polymerized flange portion 2 _3, each intermediate layer 3 _1, 3 _2, 3 ₃ between the container inner layer 1 and the container outer layer 2 with each other welding or adhesion a flange portion which is polymerized with the polymerization of the flange portion Through this, a heat insulating container for a fish box having four air heat insulating layers can be formed. In the same manner as the fish insulated container having four air insulation layers, multiple large heat insulated containers for fish can be formed.

The cup-shaped heat insulating container or the cup-shaped heat insulating container formed as described above has heat insulating properties, and styrene, which is a kind of environmental hormone, does not elute at all even when hot water is poured into the container. Environmental pollutants can be prevented, while insulated containers for fish boxes do not generate black smoke during incineration disposal after use. Therefore, it is possible to provide a non-polluting heat-insulating container that can eliminate the cost of transportation and incineration and that does not have a risk of burning the incinerator due to high heat even if it is incinerated in an incineration plant.

[0043]

According to the non-polluting heat-insulating container of the present invention, a mixed material of cellulose powder and a polyolefin-based synthetic resin is used as the container material, and even if hot water is poured into the formed container, it is made of a conventional styrene foam. Equipped with an air insulation layer on the container wall that can prevent environmental hormone pollution such as sperm halving due to use of the container without eluting styrene, which is a kind of environmental hormone that has an adverse effect on the human body like a container, It is possible to easily provide a non-polluting heat-insulating container for ready-to-eat foods to be poured into hot water and served for food.

According to the second aspect of the present invention, an intermediate layer having a plurality of concavo-convex portions oriented toward the center of the bottom of the container, which is easy to remove, is formed between the inner layer of the container and the outer layer of the container. By easily holding each layer from the sheet material of the raw material by vacuum forming or pressure forming with a single-sided mold, it is easy to stably and reliably cost-effective. A cup-shaped insulated container can be provided.

According to the third aspect of the present invention, radial ribs are formed on the outer periphery of the inner layer of the cup-shaped two-layer container,
By using the outer periphery of the bottom of the container integrally molded with the lower end of the outer layer in the shape of a reinforcing rib in the downward direction, the cup-shaped pollution-free property of a container with a deep bottom can be easily made by injection molding. An insulated container can be formed and provided.

According to the non-polluting heat-insulating container according to the fourth aspect, a mixed material of cellulose powder and a polyolefin-based synthetic resin is used as the container material, and the material is 6 mm between the inner layer and the outer layer of the container via the intermediate layer of the container. By forming a container with double or multiple air insulation layers, it can be incinerated at fish markets without generating black smoke during incineration disposal after use, even if it is incinerated at an incineration plant. It is possible to easily provide a non-polluting heat-insulating container for a fish box which does not have a risk of burning of an incinerator due to high temperature.

According to the fifth aspect of the invention, the container is formed by forming ribs having a height of 6 mm on the outside of the inner layer of the container and the inside of the outer layer of the container, and sandwiching the intermediate layer between the inner and outer layers of the container. This makes it possible to easily provide a robust non-polluting heat-insulating container for a fish box having a double 6 mm air heat insulating layer.

According to the sixth aspect of the present invention, a 6 mm rib is formed in each of the outer layer and the intermediate layer of the container, and the intermediate layer is sandwiched between the inner and outer layers of the container to form the container. Accordingly, it is possible to easily provide a large-sized non-polluting heat-insulating container for a fish tank having a multi-layered 6 mm air heat insulating layer by appropriately providing a container intermediate layer.

According to the seventh aspect of the present invention, an ultra-thin polypropylene layer is provided on the inner surface of the inner layer or the outer surface of the outer layer, so that a water-resistant cup-shaped or cup-shaped non-polluting heat-insulating container or fish box having enhanced water resistance is provided. The non-polluting heat-insulating container can be easily formed.

[Brief description of the drawings]

FIG. 1A is a longitudinal sectional view of a cup-shaped heat insulating container. FIG. 2 (B) is a cross-sectional view of the container of FIG.

FIG. 2A is a longitudinal sectional view of a cup-shaped heat insulating container. (B) It is the cross-sectional view by the XX of the container of FIG. 2 (A).

FIG. 3 (A) is a longitudinal sectional view of a fish box heat insulating container provided with a double air heat insulating layer. FIG. 3 (B) is a cross-sectional view of the container of FIG.

FIG. 4 is a partial vertical sectional view of a fish box heat insulating container provided with multiple air heat insulating layers.

[Explanation of symbols]

1 ... container inner layer, 1 ₁ ... inner sidewall, 1 ₂ ... bottom projections out of the cup-shaped inner layer, 1 ₃ ... inner flange portion, 1a, 1a '... inner ribs, 1b ... bottom of cup-shaped inner layer, 1 _1b ... Container inner layer bottom wall, 2 ... container outer layer, 2 ₁ ... outer layer side wall, 2 _1b ... outer layer bottom wall, 2 ₂ ... cup-shaped outer layer bottom projection, 2 ₃ ... outer layer flange, 2a ... outer layer rib, 2b ... The bottom of the cup-shaped outer layer,
2b ': bottom rib, 3: cup-shaped container intermediate layer, 3 ₁ ,
3 ₂ , 3 ₃ ... middle layer of container, 3 ₁₃ , ₃₂₃ , 3 ₃₃ ... flange of middle layer, 3 _1a , 3 _2a , 3 _3a ... rib of middle layer, 3 _1b , 3 _2b ,
3 _3b … the bottom wall of the middle layer.

Claims (7)

[Claims] 1. A thin container inner layer and a container outer layer are respectively formed from a mixed material of 20 to 80% of cellulose powder such as paper powder and wood powder and 80 to 20% of a polyolefin-based synthetic resin. That an air layer of 6 mm or less is held between the inner layer and the outer layer by holding an air layer of 6 mm or less between the inner layer and the outer layer by holding or bonding the inner and outer layers to each other at the periphery of the container opening. Characterized non-polluting insulated container. 2. A plurality of concavities and convexities oriented in the direction of the center of the bottom of the container in a cup shape which can be inserted between the inner layer and the outer layer as spacers between the inner layer and the outer layer of the container. The inner layer and the outer layer are heat-sealed or bonded to each other at the outer periphery of the container opening with the flanges formed outwardly on the inner and outer layers of the container, respectively, by holding the intermediate layer where the height of the uneven portion is 6 mm or less. 2. The non-polluting heat-insulating container according to claim 1, wherein an air heat-insulating layer having a thickness of 6 mm or less is formed therebetween. 3. In a thin-walled cup-shaped two-layer container whose bottom diameter is slightly smaller than its diameter, a radial height of 6 mm is provided on the outer periphery of the container inner layer.
A radial rib having a thin thickness is formed below, and the outer layer of the container can accommodate the inner layer of the container with the rib tip of the inner layer of the container being in contact with the outer layer, and the outer peripheral portion of the bottom of the thin wall has a reinforcing rib shape in the downward direction. It is formed integrally with the lower end of the outer layer on the meat,
A gap of 6 mm or less is provided between the inner layer and the outer layer of the outer periphery and the bottom of the container, and the flanges formed outwardly on the inner layer of the container and the outer layer of the container are formed on the outer edge of the container by heat welding or bonding to each other. 2. The method according to claim 1, wherein
The non-polluting insulated container according to the above. 4. A container having a thin or thick container opening, each having a square or rectangular box frame shape, made of a mixed material of 20 to 80% of cellulose powder such as paper powder and wood powder and 80 to 20% of a polyolefin-based synthetic resin. Forming an inner layer, a container outer layer, and one or more container intermediate layers insertable between the inner layer and the outer layer, and interposing the container intermediate layer between the container inner layer and the container outer layer through the container intermediate layer;
mm air layer is formed double or multiple, and the flanges formed outwardly on the container inner layer, intermediate layer, and outer layer around the container opening are formed by heat welding or bonding to each other. A non-polluting insulated container for a fish box. 5. The double formation of a 6 mm air layer between the inner layer and the outer layer of the container is achieved by forming a rib having a height of 6 mm inside the outer layer of the container and the inner layer of the outer layer of the container. 5. The non-polluting heat-insulating container for a fish box according to claim 4, wherein the container is formed by sandwiching the container. 6. The multiple formation of a 6 mm air layer between the inner layer and the outer layer of the container is performed by forming a rib having a height of 6 mm inside each of the outer layer of the container and the intermediate layer of the container to form a gap between the inner layer and the outer layer of the container. 5. A non-polluting heat-insulating container for a fish box according to claim 4, wherein said container intermediate layer is sandwiched between said containers. 7. The non-polluting heat-insulating container according to claim 1, wherein an ultra-thin polypropylene layer is provided on an inner surface or an outer surface of the inner layer when forming the inner layer and the outer layer of the container. .