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Unsized composite pipe and manufacture thereof

A composite pipe and composite pressure pipe technology, applied in the field of composite pipes, can solve the problems of short service life, environmental impact and high temperature, and achieve the effects of small linear expansion coefficient, compact composite and light weight

Inactive Publication Date: 2005-05-11
徐益鑫
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of heat-shrinkable polyethylene pipe is denatured and shaped by light radiation, and the pipe cannot be reused after use, which has an impact on the environment.
Another way to manufacture heat-shrinkable polyethylene pipes is through heat-conducting oil treatment. The oil temperature is higher, and the temperature for restoring the original pipe diameter is also higher, and the cost is relatively high, especially this restoration is only a kind of shrinkage memory. Rather than the directional memory that can control the radial and longitudinal shrinkage scales. In addition, pure polyethylene is a single crystal, and additives cannot be added to the material. The pipe is easy to age during use and has a short life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1, glue-free composite pipe, the metal pipe layer is compounded with a polyvinyl chloride pipe layer with thermal shrinkage directional memory, and its manufacturing method is:

[0015] 1) Manufacture a polyvinyl chloride pipe layer with thermal shrinkage directional memory. Extrude the polyvinyl chloride pipe added with anti-aging additives, the diameter of the pipe is slightly smaller than the diameter of the metal pipe of the composite pipe, seal the two ends of the polyvinyl chloride pipe, and put a metal pipe with a diameter larger than the pipe and a number of through holes on the radial pipe wall. The longitudinal length of the tube and the metal tube is controlled as the sum of the length of the tube, the length of the resistance head and the length of the air valve, that is, there is no room for longitudinal extension of the tube, the limit tube is fixed, soaked in a water bath at about 100°C, heated and softened, and the tube is inflated to expand th...

Embodiment 2

[0017] Example 2, with reference to Example 1, first inject pressure into the sealed tube, then heat the plastic tube with an oil bath at 70°C to expand it, and then cool it to room temperature after expansion, and exit the limiting metal tube under reduced pressure.

Embodiment 3

[0018] Example 3, glue-free composite pipe, the metal pipe layer is compounded with a polyvinyl chloride pipe layer with thermal shrinkage directional memory, and the metal pipe is compounded with a cross-linked polyethylene pipe layer, and its manufacturing method is:

[0019] 1) The cross-linked product of polyethylene and polypropylene is extruded into a tube, the diameter of which is slightly smaller than that of the metal tube. The weight of polypropylene in the material accounts for 5-15 parts, and the rest is polyethylene.

[0020] 2) The inner tube is combined with the metal tube. The cross-linked polyethylene tube is sheathed in the metal tube, and it is made by one-time drawing and extruding, and the compression amount is controlled at 0.3-1mm.

[0021] 3) Manufacture a polyvinyl chloride pipe layer with thermal shrinkage directional memory. The method is the same as in Example 1, and the heating method of the plastic pipe is to soak in an oil bath at 110°C.

[002...

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PUM

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Abstract

A non-adhesive composite pipe for delivering hot fluid or gas is composed of a metallic pipe, and two surficial layers which are the polyvinyl chloride layer with directional thermal shrinking memory function. Its advantages are high strength, light weight, and long service.

Description

technical field [0001] The invention relates to a composite pipe, which refers to a composite pipe using a polyvinyl chloride pipe with thermal shrinkage directional memory as the outer layer, which can obtain a tight composite effect without using glue, and also provides this glue-free Manufacturing method of composite pipe. technical background [0002] Ordinary polyethylene pipes do not have heat shrinkability, but under the action of rays, chemical bonds will be formed between linear molecules. The material has a "memory effect", that is, a thick tube is formed after cooling, and as long as it is heated again, it can return to the original diameter of the plastic tube before expansion. Using this feature to make a composite pipe can make the two composite layers tightly bonded without using glue. However, this heat-shrinkable polyethylene pipe is denatured and shaped by light radiation, and the pipe cannot be reused after use, which has an impact on the environment. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C63/18B32B1/08F16L9/147
Inventor 徐益鑫
Owner 徐益鑫
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