Method for producing double-wall corrugated tube

A manufacturing method and technology for corrugated pipes, which are applied in the directions of hoses, pipes, tubular objects, etc., can solve the problems of high cost and complicated forming processes, and achieve the effect of preventing deformation.

Inactive Publication Date: 2005-05-11
DENKA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] That is, since the number of devices used to prevent the deformation of the outer wall is large, and the cost related to the devices is also high, and it is formed by opening holes in the inner wall, the forming process is also very complicated.

Method used

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  • Method for producing double-wall corrugated tube
  • Method for producing double-wall corrugated tube
  • Method for producing double-wall corrugated tube

Examples

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Embodiment Construction

[0034] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[0035] First, FIG. 1 is a partial external view of the periphery of the plug portion of a double-wall corrugated pipe (hereinafter simply referred to as "corrugated pipe") extruded in a series of connected states by the manufacturing method of the present invention.

[0036] The corrugated tube 1 is provided with an outer wall 11 having a concavo-convex shape formed mainly to increase strength, and a cylindrical inner wall 12 thermally welded to an inner wall surface portion of the outer wall 11 .

[0037] The outer wall 11 has the aforementioned concavo-convex shape in which the convex portions 14 and the concave portions 15 are repeatedly formed, and an annular hollow chamber 13 closed by the outer wall 11 and the inner wall 12 is formed inside each convex portion 14 .

[0038] Moreover, the symbol 4 in FIG. 1 represents the inner hollow portion inside...

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Abstract

The invention provides a method for manufacturing a double-wall corrugated pipe, which is manufactured by extruding a thermoplastic resin with a socket portion (3) at one end, a plug portion (2a) at the other end, and an outer wall (11 (21, 31 )) is a continuous annular concave-convex shape, and the inner wall (12 (22)) is a method of cylindrical double-walled corrugated pipe (1), in the forming process, before the double-walled corrugated pipe (1) is cooled , by piercing the needle (5) into the outer wall (21) part of the plug part (2a) to open a hole, and by making the hollow chamber (23) of the plug part (2a) communicate with the atmosphere, it is possible to reliably prevent the resulting deformation of the outer wall (21) of the plug portion (2b). This method can easily and reliably manufacture a double-wall corrugated tube having a plug portion of a predetermined shape without deformation.

Description

technical field [0001] The invention relates to a method for manufacturing a double-wall corrugated pipe. Specifically, it relates to a double-walled corrugated pipe used in general drain pipes and protective pipes for information boxes, etc. manufacturing method. Background technique [0002] First, the general form of the double wall corrugated pipe will be described with reference to the attached FIG. 8 . The double-wall corrugated pipe indicated by reference numeral 100 is a tubular body of one connecting unit having a socket portion 101 at one end and a plug portion 102 at the other end, which is cut after continuous extrusion of thermoplastic resin. [0003] The double-walled corrugated tube 100 is composed of an outer wall 103 having a concave-convex shape when viewed from the outside, and a cylindrical inner wall 105 which forms a hollow chamber 104 and is thermally welded to the inner side of the outer wall 103 . [0004] After the plug part 102 is formed, the di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L11/11B29C48/09B29C48/30B29C48/32B29C48/90
CPCB29C49/0021B29C2791/006B29C2791/007B29L2023/18B29L2023/186B29C48/09B29C48/13B29C48/0018B29C48/21B29C48/303B29C48/336B29C49/0025
Inventor 原口秀人长谷川升津川大辅浦部洋史
Owner DENKA CO LTD
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