JP3029257U - Foam container - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a foam container that is not easily scratched or soiled on the surface and is watertight and capable of printing and attaching a label. A foamed container having a watertight skin layer formed by thermosetting the container integrally formed on the surface of the container formed by foaming a thermoplastic resin.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a foamed container used for keeping heat, cold, and transporting articles in various industrial fields.

[0002]

[Prior art]

 Molded containers made of foamed plastic, which have been conventionally used for cold and warm transportation of goods, or for storage, are lightweight, have excellent heat insulation, cushioning, and sound insulation, and also have appropriate durability, and are used in many fields. It is used in. It also has many features such as easy secondary processing such as cutting.

[0003]

[Problems to be solved by the device]

 Although the foam containers that have been conventionally used have the above-mentioned advantages, they have the drawbacks that the surface of the molded foam container is soft, easily scratched, and easily soiled. In addition, since the surface is rough and uneven and is not smooth, printing is difficult and even when a printed matter such as a label is attached, it is easily peeled off. Water may also penetrate through the gaps between the foam beads. In order to improve such a defect, as shown in FIG. 5, a water-tight molded article 102 which is in conformity with the inner surface 101 of the foam container 100 is separately provided with polystyrene (PS), polypropylene (PP). ) Etc. are used to mold and fit. However, this method has the drawback that it is time-consuming and costly. The present invention has been made in view of the above circumstances, and an object thereof is to provide a foamed container that solves the above problems.

[0004]

[Means for Solving the Problems]

 In view of the above object, the present invention solves the above-mentioned problems by a foamed container having a watertight skin layer integrally formed by heat-curing the container on the surface of a container formed by foaming a thermoplastic resin. Further, the present invention solves the above-mentioned problems by a foam container in which the surface of a container formed by foam-molding a thermoplastic resin is heated to a molecular orientation temperature or higher, and a water-tight skin layer that is melt-cured is formed on the surface. .

[0005]

[Embodiment of device]

 Hereinafter, the present invention will be described in detail with reference to the drawings. A thermoplastic material is used as the material of the foam container according to the present invention. For example, polystyrene (PS) or polypropylene (PP) or a copolymer of polystyrene (PS) and polyethylene (PE) is used. Using the foam beads of these materials, as shown in FIG. 1, a required amount of the foam beads 3 contained between a pair of molds 1 and 2 are thermocompression bonded to form a molded body 4. Reference numeral 5 indicates a filling port for the foam beads 3, and steam is fed in from an arrow A. Regarding the temperature of the surface of the molded body 4 that is in contact with the surface of the mold 2, the mold temperature is raised up to around the thermal deformation temperature, that is, the molecular orientation temperature of the resin (120 ° C. to 160 ° C.), Only the surface in contact with the mold 2 is melted to form the skin layer 9 as shown in FIG. The thickness of the skin layer 9 is adjusted by appropriately controlling the processing time. Regarding the treatment temperature, if the temperature is lower than 120 ° C., a preferable skin layer cannot be obtained, and if the temperature exceeds 160 ° C., the melting becomes too fast, which makes the production technique difficult. After cooling and releasing, as shown in FIGS. 3 and 4, foamed containers 10 and 11 in which the inner and outer surfaces of the molded body are covered with smooth, hard and watertight skin layers 8 and 9 are obtained. With respect to the lid of this foam container, if a skin layer is formed on the inner surface in the same manner, a foam container having a skin layer on the entire inner surface can be obtained. By forming the surface of the mold 2 on which the skin layer is formed into a satin finish or an uneven pattern, the surface of the skin layer can also be formed on the corresponding surface. It should be noted that the present invention is not limited to the above-mentioned embodiment, but the skin layer may be formed by hardening the surface of the foam container by another method, for example, by a method other than the above-mentioned manufacturing method.

[0006]

[Effect of device]

 According to the foam container of the present invention, since the surface is covered with the hard and watertight skin layer, scratches and stains are less likely to occur. There is also no penetration of water. Therefore, the foam container can be reused and washed with water, and the foam container can be recycled. In addition, it is easy to print directly on the surface of the foam container and to attach paper labels, etc. Therefore, not only is it functionally convenient, but it is also possible to improve the appearance and give design consideration. Furthermore, the foam container according to the present invention is characterized in that the production cycle from foam molding to formation of the skin layer can be relatively short.

[Brief description of drawings]

FIG. 1 is a view for explaining a manufacturing procedure of a foam container according to the present invention.

FIG. 2 is a diagram for explaining the procedure of forming a skin layer on the surface in the same step as that of FIG.

FIG. 3 is a cross-sectional explanatory view of an embodiment of a foam container similarly having a skin layer formed on the inner surface.

FIG. 4 is a cross-sectional explanatory view of another embodiment of the foam container in which a skin layer is similarly formed on the outer surface.

FIG. 5 is a cross-sectional explanatory view of a conventional foam container.

[Explanation of symbols]

 1, 2 Mold 3 Foamed beads 4 Molded body 8,9 Skin layer 10,11 Foamed container

Claims (2)

[Scope of utility model registration request] 1. A foamed container having a watertight skin layer integrally formed by heat-curing the container on a surface of a container formed by foaming a thermoplastic resin. 2. A foamed container obtained by heating the surface of a container formed by foaming a thermoplastic resin to a molecular orientation temperature or higher to form a melt-cured watertight skin layer on the surface.