JPH05200828A - Manufacture of sponge tube - Google Patents

Abstract

PURPOSE:To provide the manufacture of the sponge tube of high expansion ratio into which even the long aluminum pipe with a small radius of carvature may be easily inserted. CONSTITUTION:This method is the manufacture of the sponge tube into which the aluminum pipe for piping is inserted, and wherein, a plurality of the rods 20 or pipes with the diameter of 1-6mm composed of polyethylene crosslinked substance, polypropylene crosslinked substance, the polyethylene with super high molecular weight, fluorine plastic, etc., are coextruded on the inner surface of heat shrinkable sponge tube, and they are mutually stuck.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention, for the purpose of heat insulation and protection, inserts an aluminum pipe for car cooler piping,
The present invention relates to a sponge tube that covers the outer surface thereof.

[0002]

2. Description of the Related Art A description will be given with reference to FIG. Conventionally, aluminum pipes for car cooler piping have been inserted into sponge tubes for the purpose of heat insulation and protection. At that time, in order to facilitate the insertion of a pipe (especially a pipe with a small radius of curvature and a long length), talc powder, suniso oil, DO
Although S and the like are included, there is a problem that the work environment is significantly polluted.

As a countermeasure, a method has been proposed in which an aluminum pipe is inserted into a heat-shrinkable sponge tube having a large inner diameter, and the heat-shrinkable sponge pipe is heated and shrunk so that the heat-shrinkable sponge pipe adheres to the aluminum pipe, but a heat source for heating is required. However, there is a problem that it becomes hot and the heat-shrinkable sponge tube that has been expanded has a weak waist, which hinders the operation when the pipe is inserted.

[0004]

The problem to be solved is that, when inserting the aluminum pipe for car cooler piping into the sponge tube, the conventional means for facilitating the insertion deteriorates the working environment and the operation. To make it difficult.

[0005]

Means for Solving the Problems An explanation will be given with reference to FIGS. The present invention relates to a method for manufacturing a sponge tube structure in which an aluminum pipe for piping is inserted, wherein a plurality of diameters made of polyethylene crosslinked material, polypropylene crosslinked material, ultra high molecular weight polyethylene, fluororesin, etc. are formed on the inner surface of the heat shrinkable sponge tube 10. It consists of co-extruding a 1 to 6 mm rod 20 or a pipe 30 and fixing them.

[0006]

EXAMPLE An example will be described with reference to the drawings. On the inner surface of the heat-shrinkable sponge tube 10, a polyethylene crosslinked product, a polypropylene crosslinked product, an ultra high molecular weight polyethylene,
Diameter 1 to 6 made of thermoplastic and low-sliding resin such as fluorine resin
The rods 20 or pipes 30 of mm are arranged and fixed, and are manufactured by coextrusion. The material, diameter, and number of the rods 20 or the pipes 30 are determined by the expansion ratio (specific gravity) of the expanded heat-shrinkable sponge tube 10, that is, the rigidity.

In any of the sponge tubes manufactured by the above method, the slidability of the inner surface of the tube 10 is improved, the radius of curvature is small, and a long aluminum pipe can be easily inserted, and its rigidity is sufficiently high. It does not hinder the shape retention.

[0008]

Since the present invention is constructed as described above,
It is possible to manufacture a sponge tube having a small radius of curvature, easy insertion even with a long aluminum pipe, and having a high foaming rate without hindering shape retention.

[Brief description of drawings]

FIG. 1 is a perspective view showing a conventional sponge tube.

FIG. 2 is a perspective view showing a sponge tube according to a first embodiment of the present invention.

FIG. 3 is a perspective view showing a sponge tube according to a second embodiment of the present invention.

[Explanation of symbols]

 10 Sponge Tube 20 Bar 30 Pipe

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Claims (1)

[Claims] 1. A method for manufacturing a sponge tube structure in which an aluminum pipe for piping is inserted, wherein a plurality of crosslinked polyethylene, polypropylene crosslinked, ultra high molecular weight polyethylene, fluororesin, etc. are formed on the inner surface of the heat shrinkable sponge tube (10). Rod (20) or pipe (3) with a diameter of 1-6 mm
0) is co-extruded and fixed to a sponge tube.