JP2005145497A - Storing container and method for manufacturing storing container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storing container which can be manufactured only by undergoing one embossing molding process by an embossing means, and is excellent in thermal insulation properties. <P>SOLUTION: The storing container for food comprises an outer layer composed of a foamed polystyrene or a foamed polypropylene, an intermediate layer arranged in the outer layer and composed of an ordinary polystyrene, and an inner layer arranged in the intermediate layer and composed of a polyethylene terephthalate. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a plastic storage container for storing food such as instant noodles, and more particularly to a storage container in which a foam is integrally formed in a container in order to keep heat insulation and a method for manufacturing the storage container. .

  There are foods such as instant noodles and hot beverages that are cooked by pouring hot water. Since these foods can be mass-produced, plastic containers suitable for mass production are used as containers for storing foods. The plastic container for storing these foods is preferably provided with a heat insulating structure in order to prevent heat from escaping outside the container when hot water is poured.

  Conventionally, as a heat insulating structure for this type of plastic container, there is a structure in which a container is doubled like an inner container and an outer container and a space is provided between them (see, for example, Patent Documents 1 and 2).

JP2002-145356 JP 2002-166978 A

  However, if two containers, an inner container and an outer container, are required, two embossing means for forming two containers are required, and the equipment becomes large. In addition, when manufacturing one storage container, a process of embossing with two embossing means and a process of assembling the two containers are required, resulting in problems such as time and cost.

  An object of the present invention is to provide a storage container that can be manufactured only through a single stamping molding process by a stamping means and has excellent heat insulation.

  The first means according to the present invention for achieving the above object is a food storage container, comprising an outer layer made of expanded polystyrene or expanded polypropylene, and made of general polystyrene disposed inside the outer layer. It has an intermediate | middle layer and the inner layer which is arrange | positioned inside the said intermediate | middle layer and is comprised from a polyethylene terephthalate, It is characterized by the above-mentioned.

  According to the 1st means, since it has a foam in an outer layer, the storage container excellent in heat insulation can be provided. In addition, since the outer layer having a heat insulating effect is formed from a heat insulating sheet material that is integrally formed with the intermediate layer and the inner layer, when forming the shape of the storage container from the heat insulating sheet material, it is formed by only one embossing step. Can do.

  A second means according to the present invention for achieving the above object is a method for producing a storage container having a heat insulating layer, an extrusion molding step of molding a sheet material by an extrusion molding means, and foamed polystyrene in the sheet material. A welding process for forming a heat insulating sheet material, a stamping process for embossing the heat insulating sheet material to form a shape of a storage container, and a cutting process for cutting out the storage container and taking out a finished product. When the foam is welded to the sheet material, the foam is welded by heat that the sheet material has when being extruded by the extrusion molding means.

  According to the second means, the heat insulation effect is obtained by simply bringing the foam into contact with the melted state by the heat that the sheet material has when being extruded by the extrusion molding means. A sheet material is formed. For this reason, there is no need for means for adhering the foam to the sheet material, and the heat insulating sheet material can be configured efficiently. Moreover, since the said heat insulation sheet material is comprised integrally, a storage container can be shape | molded only by the one stamping process.

  A third means according to the present invention for achieving the above object is a method for producing a storage container having a heat insulating layer, an extrusion molding step of molding a sheet material by an extrusion molding means, and a foamed polypropylene for the sheet material. A welding process for forming a heat insulating sheet material, a stamping process for embossing the heat insulating sheet material to form a shape of a storage container, and a cutting process for cutting out the storage container and taking out a finished product. When the foam is welded to the sheet material, the foam is welded by heat and adhesive that the sheet material has when it is extruded by the extrusion molding means.

  According to the third means, when the foamed polypropylene is welded to the sheet material, since the adhesive can be quickly unwound by heat, the heat insulating sheet material can be efficiently configured.

  According to the 1st means, since it has a foam in an outer layer, it is the composition which is excellent in heat insulation, and the outer layer is only from a heat-insulating sheet material constituted integrally with an intermediate layer and an inner layer by one embossing process. Since it can be molded, it can be manufactured with a small number of steps. For this reason, it is possible to provide a storage container that can be manufactured only through a single molding process by the embossing means and is excellent in heat insulation.

  According to the 2nd means, the means to adhere | attach a foam with respect to a sheet material is unnecessary, and a heat insulation sheet material can be comprised efficiently. Moreover, since the said heat insulation sheet material is comprised integrally, a storage container can be shape | molded only by the one stamping process.

  Embodiments of the storage container and the method for manufacturing the storage container of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a finished product of a storage container, FIG. 2 is a perspective view and a cross-sectional view of a multilayer resin sheet before forming the storage container, and FIG. 3 is an explanatory view of a method for manufacturing the storage container.

(Storage container)
The appearance of the storage container of the present invention will be described. As shown in FIG. 1, the storage container A of the present invention has a wide opening and a wide bottom area, and can store food such as instant noodles inside. Further, the container is made of an integral plastic resin and is lightweight and can be mass-produced. As will be described in detail below, the storage container A has a heat insulating structure. For this reason, when cooking hot instant noodles and the like, pouring hot water and closing the lid prevents internal heat from escaping to the outside, so that cooking can be efficiently performed in a short time.

  The storage container A of the present invention shown in FIG. 1 is manufactured by first forming a heat insulating sheet material B made of plastic resin as shown in FIG. 2A and then embossing the heat insulating sheet material B. Here, as shown in FIG. 2B, the heat insulating sheet material B is formed by stacking plastic resins in three layers and integrally forming them. Specifically, the outer layer 1 that is outside the storage container A and has a high heat insulating effect, the intermediate layer 2 that is located inside the outer layer 1 and has rigidity, and the inner layer 2 that is further inside the effect to keep food quality It is comprised from the inner layer 3 with. This layer structure will be described in detail.

  The outer layer 1 is located outside the storage container A and is made of a foam having high heat insulating performance so as not to escape the heat inside.

  The intermediate layer 2 is located inside the outer layer 1 and serves as a base material. The material is light and hard polystyrene (HIPS, GPPS). Polystyrene is suitable as a substrate because it is easy to mold and has good dimensional stability.

  The inner layer 3 is located inside the intermediate layer 2. The material is polyethylene terephthalate such as PET / G or PET polymer. Polyethylene terephthalate has features such as tasteless and odorless, excellent chemical resistance, gas barrier properties, chemical resistance and sealability. For this reason, quality deterioration of the foodstuffs accommodated inside can be prevented.

  With such a structure, the storage container A has a configuration in which the quality of the food to be stored is not deteriorated and the heat of the hot water poured inside is not released to the outside.

(Method for manufacturing storage container)
The manufacturing method of the storage container A is demonstrated using FIG. As shown in FIG. 3, the manufacturing process of the storage container A includes an extrusion molding step S1 for molding the sheet material C by extrusion molding, a welding step S2 for welding the foam to the sheet material C to form the heat insulating sheet material B, Conveying step S3 for conveying the formed heat insulating sheet material B to the position of the embossing means. Embossing step S4 for embossing the heat insulating sheet material B composed of three layers to form the shape of the storage container. It is comprised from the cutting process S5 which cuts out the storage container A from the heat insulation sheet | seat material B in which shape of this was formed. Details will be described below.

(Extrusion molding step S1)
First, in the extrusion molding step S1, a sheet material C composed of the intermediate layer 2 and the inner layer 3 is molded. From the extrusion molding means X, polyethylene terephthalate, which is the material of the inner layer 3, is extruded while being heated and softened, and from the extrusion molding means Y, polystyrene, which is the material of the intermediate layer 2, is extruded while being softened. Is done. The materials extruded from the extrusion molding means X and Y are stacked, and the sheet material C is formed. Here, the sheet material C is welded to each other by heat held at the time of extrusion of the respective materials, and is integrated.

(Welding step S2)
The sheet material C is conveyed to a place where there is a foam roll 11 such as foamed polystyrene or foamed polypropylene while being continuously formed by the extrusion means. The foam roll 11 is a foam formed in advance in a roll shape, and is pivotally supported above where the sheet material C is conveyed.

  Since the sheet material C extruded from the extrusion forming means has heat necessary for extrusion, it is not yet completely solidified and is still in a softened state. In this state, when the sheet-like foam supplied from the foam roll 11 is brought into contact with the conveyed sheet material C, the foam and the sheet material C are welded. In this way, the heat insulation sheet material B comprised integrally from the outer layer 1, the intermediate | middle layer 2, and the inner layer 3 is formed.

  As described above, in the welding step S2, a sheet-like foam is welded to the sheet material C by utilizing the fact that the sheet material C is softened by heat at the time of extrusion in the extrusion molding step S1. To do. For this reason, when uniting the sheet material C and the foam, if the foam is foamed polystyrene, there is no need for a means or a process for bonding such as an adhesive, and the heat insulating sheet material B is efficiently formed. be able to. Further, when the foam is foamed polypropylene, an adhesive is required when adhering to the sheet material. Also in this case, when the sheet material C has heat, the adhesive softens more quickly due to the heat, and spreads between the foamed polypropylene and the sheet material C without unevenness. For this reason, even when an adhesive is used, the heat insulating sheet material B can be efficiently formed in a short time.

(Conveying step S3)
In conveyance process S3, the heat insulation sheet material B formed continuously is conveyed to the place where there exists an embossing means downstream in a conveyance direction. In this process, the heat insulating sheet material B can be cooled and solidified, and the outer layer 1, the intermediate layer 2, and the inner layer 3 can be completely integrated.

(Embossing process S4)
In the embossing step S4, first, the heat insulating sheet material B is softened by heating the top and bottom of the heat insulating sheet material B with a heater. Next, the shape of the storage container A is formed on the heat insulating sheet material B by embossing using a convex / concave mold in the shape of the storage container.

(Cutting step S5)
In cutting process S5, the shape part of the storage container A currently formed on the heat insulation sheet material B is cut out by cutting means, such as a cutter. Thereby, the heat insulation sheet material B and the storage container A isolate | separate, and the storage container A is completed as a product.

  Thus, according to the manufacturing method of this invention, the heat insulation sheet material B which has a heat insulation structure integrally can be formed continuously. For this reason, a storage container having a heat insulating structure can be formed in one embossing process, and since a plurality of embossing means and an assembling process are not required as in the prior art, the heat insulating structure can be efficiently formed. A storage container having the same can be manufactured.

  In addition, when an expanded polystyrene is used for an outer layer, after crushing finely, it can be reused and resources can be utilized effectively.

(Other embodiments)
In the above-described embodiment, the three-layer structure including the outer layer, the intermediate layer, and the inner layer is used. However, the three-layer structure is not always necessary, and a two-layer structure in which the outer layer is foam and the inner layer is polystyrene is also possible. Good.

  The present invention can be generally used for a storage container having a heat insulating structure.

The perspective view of the finished product of a storage container. The perspective view and sectional drawing of a multilayer resin sheet before storage container shaping | molding. Explanatory drawing of the manufacturing method of a storage container.

Explanation of symbols

A: Storage container, B: Insulating sheet material, C: Sheet material,
S1 ... extrusion molding process, S2 ... welding process,
S3 ... Conveying process, S4 ... Embossing process, S5 ... Cutting process,
X ... extrusion molding means, Y ... extrusion molding means,
DESCRIPTION OF SYMBOLS 1 ... Outer layer, 11 ... Foam roll,
2 ... intermediate layer,
3 ... Inner layer

Claims (3)

A food container,
It has an outer layer composed of expanded polystyrene or expanded polypropylene, an intermediate layer disposed inside the outer layer and composed of general polystyrene, and an inner layer disposed inside the intermediate layer and composed of polyethylene terephthalate. A storage container. A method of manufacturing a storage container having a heat insulating layer,
An extrusion molding step of molding a sheet material by extrusion molding means;
Welding process for forming a heat insulating sheet material by welding foamed polystyrene to the sheet material;
An embossing step of embossing the heat insulating sheet material to form the shape of the storage container;
A cutting step of cutting out the storage container and taking out a finished product,
When the foam is welded to the sheet material, the foam is welded by the heat that the sheet material has when being extruded by the extrusion molding means. A method of manufacturing a storage container having a heat insulating layer,
An extrusion molding step of molding a sheet material by extrusion molding means;
A welding step of forming a heat insulating sheet material by welding foamed polypropylene to the sheet material;
An embossing step of embossing the heat insulating sheet material to form the shape of the storage container;
A cutting step of cutting out the storage container and taking out a finished product,
When the foam is welded to the sheet material, the foam is welded by heat and adhesive that the sheet material has when being extruded by the extrusion molding means. Method.

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