JPS5924636A - Cushioning and heat insulating material, working method thereof and bar heater - Google Patents

Abstract

PURPOSE:To give enough strength to a bent part by fusing by a method wherein the bar heater, which has a U-like configuration in bottom cross section and a V-like configuration in upper cross section connecting to the bottom cross section, is heat-pressed into sheet-like thermoplastic foamed resin material from its surface toward its back so far not to pierce therethrough. CONSTITUTION:The bar heater 1, which has a U-like configuration in cross section at its bottom part and a V-like configuration in cross section at its upper part connecting to said bottom part, is heat-pressed into the sheet-like thermoplastic foamed resin material 2 from its surface toward its back so far not to pierce therethrough in order to form a nearly V-like groove in the sheet-like foamed resin material 2. The sheet-like foamed resin material 2 is urged by being bent at the center line of the groove so as to fuse both the walls of the groove each other, which are in molten state, in order to form the cushioning and insulating material. Foams of polyethylene, polypropylene, polyvinyl chloride, polystyrene, polymethyl methacrylate or the like are avaible for said thermoplastic foamed resin.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a buffer heat insulating material using thermoplastic foam resin, a processing method thereof, and a rod-shaped heating body used during processing.

Generally, when manufacturing folded structural members for cushioning or heat insulation using thermoplastic foam resin, methods are used such as integral foam molding using a mold, and methods of assembling foam resin plates by bonding or fusing them together. ing. However, the method using integral foam molding does not allow large-sized products to be obtained, and from the economic point of view, it is limited to large-scale production, making it unsuitable for production of a small number of products in a wide variety of products. The method of adhering foamed 4M platelets to each other has a weak bonding angle of 41 degrees and poor workability. The method of fusing plate-like objects together is also complicated and troublesome. For this purpose, a V-shaped groove is formed in the foamed resin plate using a rod-shaped heating element with a V-shaped cross section, and the foamed resin plate is bent and pressure-welded from the center line of the groove while still in a molten state. A method of manufacturing a bent structural member by welding both walls of the groove to each other is known. This method has the advantage of being simple in process, suitable for mass production, and flexible in the production of a wide variety of products in small quantities.

However, in the case of the rod-shaped heating element with a cross section of ``■'' used in this method, the melting state of both walls of the ``■-shaped groove'' formed by this heating element is difficult to be uniform. However, there is a problem in that it is difficult to obtain sufficient fusion strength.

For example, when trying to obtain the structural part 1 bent at right angles, if a rod-shaped heating element with a V-shaped cross section and a tip angle of 90 degrees is used, the part melted by the rod-shaped heating element as shown in FIG. Since it is distributed in a shape that is pressed down at the bottom, the strength of the fusion bond at the inner corner is weak even when bending and pressure welding, and in extreme cases, only a part can be obtained with peeling off. Further, if a rod-shaped heating element with a V-shaped cross section and a tip angle smaller than 90 degrees is used, a pad of meat will be formed at the inner corner as shown in FIG. Further, if a rod-shaped heating element having a square cross section and a tip angle larger than 90 degrees is used, sufficient fusion cannot be obtained as shown in FIG.

In view of the current situation, the inventors of the present invention have investigated the idea of providing a buffer insulation 44 whose folded structure has sufficient fusion strength and a neat folded structure using thermoplastic foam resin. discovered that the purpose could be achieved by making the rod-shaped heating element into a special shape that forms the groove that becomes the bending part,
We have arrived at the present invention.

That is, the present invention heats a rod-shaped heating element whose bottom part has a U-shaped cross-section and whose upper part continuous thereto has a V-shaped cross-section so as not to penetrate from the surface to the back of a thermoplastic foam resin plate. A substantially V-shaped groove is formed in the foamed resin plate by pressing, and the foamed resin plate is bent and pressed from the center line of the groove to bond both walls of the groove, which are still in a molten state. Regarding the buffer insulation iA, which is characterized by being fused together, a suitable processing method is a rod-shaped heating method in which the bottom part has a U-shaped cross section and the upper part continuous thereto has a V-shaped cross section. A substantially V-shaped groove is formed in the foamed resin plate by heating and pressing the body so as not to penetrate from the surface to the back of the thermoplastic foamed resin plate, and from the center line of the groove, the foamed resin plate is A method for processing a thermoplastic foamed resin plate, which is characterized by bending and press-welding the object to fuse both walls of the groove, which are still in a molten state, to each other. The present invention relates to a rod-shaped heating body characterized in that its bottom portion has a U-shaped cross-section and the upper portion continuous thereto has a V-shaped cross-section.

Thermoplastic foam resins used in the present invention include polyethylene, polypropylene, polyvinyl chloride, borisdirine,
Examples include foams such as polymethyl methacrylate, polyamide, polyacetal, and polycarbonate.

In order to obtain the buffer heat insulating material of the present invention, a plate-like object made of the above-mentioned thermoplastic foam resin is used, and a rod-shaped heating body is heated and pressed so as not to penetrate from the front surface of the plate-like object to the back surface of the foam resin. A substantially V-shaped groove is formed in a plate-like article, the foamed resin plate is bent and pressed from the center line of the groove, and both walls of the groove, which are still in a molten state, are fused together. be able to. The rod-shaped heating body used at this time is characterized in that the bottom portion has a U-shaped cross section, and the upper portion continuous thereto has a V-shaped cross section, as shown in FIG. The height 01 width d of the bottom portion of the U-shaped cross section and the distance between the bottom tip and the back surface of the plate-like object become smaller as the density of the thermoplastic foam resin increases. C is also influenced by the thickness of the plate-like object, and increases as the thickness increases. Furthermore, the tip angle β of the V-shaped cross section of the upper portion matches the angle of the bent portion.

When a thermoplastic foam resin plate is heated and suppressed using such a rod-shaped heating body as described above, a substantially V-shaped groove portion having a uniform melted portion is formed in the foam resin plate. By bending and pressing from the center line of the groove, a buffer insulation material with good fusion strength and a beautiful new curved structure can be obtained.

Since the buffer insulation 44 according to the present invention is made of thermoplastic foam resin, it has excellent cushioning properties, heat insulation properties, etc., and is therefore used as a cushion for transporting luggage or as the heat/cold storage section 44.

[Brief explanation of the drawing]

Figures 1, 2, and 3 are conventional examples, Figure 4 is an example of the present invention, Figure 5 is a rod-shaped heating element of the present invention, and Figure 6 is an example of the buffer insulation material of the present invention. . 1... Rod-shaped heating element 2... Foam filter... Melting part 4... Bending part Fig. 5

Claims (3)

[Claims] (1) The bottom part has a U-shaped cross section, and the upper part that follows it has a V-shaped cross section, and the rod-shaped heating element is heated and pressed so that it does not penetrate from the surface to the back of the thermoplastic foam resin plate. Then, a substantially V-shaped groove is formed in the foamed resin plate, and the foamed resin plate is bent and pressed from the center line of the groove, so that both walls of the groove, which are still in a molten state, are joined together. A buffer insulation material characterized by being fused. (2) A rod-shaped heating element whose bottom part has a U-shaped cross-section and whose upper part continues to have a V-shaped cross-section is heated and pressed so as not to penetrate from the surface to the back of the thermoplastic foam resin plate. A substantially V-shaped groove is formed in the foamed resin plate, and the foamed resin plate is bent and pressed from the center line of the groove to fuse both walls of the groove, which are still in a molten state, to each other. A method for processing a thermoplastic foamed resin plate-like article, characterized in that it is coated. (3) A rod-shaped heating body characterized in that the bottom portion has a U-shaped cross section and the upper portion continuous thereto has a V-shaped cross section.