JPH0621930U - Thermoplastic foam resin molding - Google Patents

Abstract

(57) [Abstract] [Structure] Preformed thermoplastic foamed resin molding 2
Has a coating layer 3 newly formed by using thermoplastic resin pre-expanded particles. [Effect] Excellent strength and dimensional stability, and a used foamed resin molding can be efficiently reused.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a foamed resin block and a foamed resin board used in civil engineering / construction and other fields. More specifically, the invention relates to a foamed resin block and a foamed resin block having excellent strength and dimensional stability. The present invention relates to a thermoplastic foamed resin molded product in which a plate can be reused.

[0002]

[Prior art]

 Conventionally, foamed resin blocks and foamed resin plates that have been preformed with thermoplastic resin pre-expanded particles in a mold and have been heat-molded make full use of their lightness, heat insulation, sound insulation, etc. It is used as a material and as a floor base material.

[0003]

[Problems to be solved by the device]

 However, the strength of these foamed resin blocks and foamed resin plates is not always sufficient, and higher strength is desired, and ordinary foamed moldings have large shrinkage after molding and are put to practical use. However, there is a problem that it is necessary to leave it for several days.

Further, in recent years, it has been desired to reuse these foamed resin moldings, and at present, they are hardly reused as they are due to stains and the like caused by one-time use. For example, the embankment material is not reused in its original form due to soiling or small damage due to soiling or small damage, even though the basic physical properties such as compressive strength have not been impaired by its use. Most of them were crushed and reused.

The present invention solves the above-mentioned conventional drawbacks and provides a thermoplastic foamed resin molded body which is excellent in strength and dimensional stability and can reuse a used foamed resin molded body. It is intended for and.

[0006]

[Means for Solving the Problems]

 As a result of earnest studies, the inventors of the present invention were able to achieve the above object by adopting the following configuration. That is, the thermoplastic foamed resin molded product of the present invention has a coating layer newly molded using thermoplastic resin pre-expanded particles on the surface of the preformed thermoplastic foamed resin molded product. It is characterized by.

Hereinafter, the present invention will be described in more detail with reference to the drawings. As shown in FIG. 1, the thermoplastic foamed resin molding 1 of the present invention is a coating layer newly molded on the surface of a premolded foamed resin molding 2 using thermoplastic resin pre-expanded particles. It has three.

The pre-molded foamed resin molded body 2 can be formed of various foamed resins, examples of which include foamed resins such as polystyrene, polyethylene, polypropylene, polyurethane and polyvinyl chloride. I can list the ones I made.

As the foamed resin molded body 2, in addition to an unused molded body, a foamed molded body that has been once used as an embankment material or the like is used, which is cut with a nichrome wire to remove the surface contaminated with earth and sand. Good.

Examples of pre-expanded particles constituting the coating layer 3 include polystyrene, polyethylene, polypropylene and the like. It is preferable to use pre-expanded particles made of the same kind of resin as the resin forming the foamed resin molded body 2.

The foamed resin molded body 1 of the present invention is manufactured from the foamed resin molded body 2 and the pre-expanded particles. As a method for producing the same, for example, the foamed resin molded body 2 is put in a usual mold for bead foaming molding having a desired size, the space portion of the mold is filled with pre-foamed particles, and heated and cooled. At that time, it is preferable that the entire area between the foamed resin molded body 2 and the inner wall surface of the mold be substantially constant. For this purpose, for example, a foamed plastic piece (preferably the same material as the foamed resin molded body 2) or a spacer such as a small plate having protrusions on both sides as shown in FIG. Is fixed to the center of the mold, and the remaining space is filled with pre-expanded particles so that the spacer is incorporated into the final molded product.

Since the foamed resin molding 1 of the present invention is manufactured as described above, the surface of the foamed resin molding 2 embedded therein is heated again and a skin layer is formed. The strength is superior to that of a normal foam molded article. Further, by appropriately changing the bulk density of the pre-expanded particles of the coating layer 3 to be newly molded, the apparent density of the foamed resin molded product 1 can be changed as desired, and further, the pre-molded resin is preformed. When the foamed resin molded body 1 is manufactured by using the pre-expanded particles having a higher density than the foamed resin molded body 2, the strength becomes higher.

[0013]

【Example】

 (Example 1) Pre-molded and already used density 20 kg / m³Of 1m x 2m x 0.5m height, the whole surface of the expanded polystyrene block soiled with earth and sand was cut off for a thickness of 2cm using a nichrome wire and placed in a mold for foam molding with a density of 20kg. / M ³ Using a foam polystyrene spacer of 5 cm × 5 cm × 2 cm, the mold was installed at approximately the center of the mold (two positions on the lower surface of the mold and one position on the front, rear, left and right). Then density 20 kg / m³The pre-expanded polystyrene particles of were filled and heated / cooled. The expanded polystyrene molded product that emerged showed almost no shrinkage even after molding, and became stable after standing for 1 day. Furthermore, the strength was also excellent.

[0014]

EFFECTS OF THE INVENTION Since the foamed resin molded product of the present invention has a coating layer newly formed using pre-foamed resin particles on the surface of the preformed foamed resin molded product, In addition, it is excellent in dimensional stability and can reuse a used foamed resin molded body.

[Brief description of drawings]

FIG. 1 is a perspective view of a foamed resin molded body obtained by cutting off a part of a coating layer of the present invention.

FIG. 2 is a form of a spacer used for manufacturing the foamed resin molding of the present invention.

[Explanation of symbols]

 1 Foamed Resin Molded Body 2 Preformed Foamed Resin Molded Body 3 Cover Layer

Claims (1)

[Scope of utility model registration request] 1. A thermoplastic foamed resin molded body having a coating layer newly molded using thermoplastic resin pre-expanded particles on the surface of a preformed thermoplastic foamed resin molded body.