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Combined coating mold for Krah pipe

A technology for molds and tubes, which is applied in the field of composite coating molds for carat tubes, and can solve problems such as obvious shrinkage marks, corrugated outer rib surfaces, and large extrusion resistance

Pending Publication Date: 2022-02-25
福建亚通新材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Usually, the front end of the die is straight and hollow cylindrical. The length design of the straight section will affect the extrusion quality. The length of the straight part is generally 2-6 times the inner diameter of the die. If the inner diameter is small, take a larger multiple, and vice versa. On the contrary, if the length of the straight part is too large, the extrusion resistance will be too large, resulting in rough extrusion surface
[0004] During the coating process of the inner liner, the "O" type HDPE belt layer is prone to inversion when it is released from the mold, resulting in poor coating effect, obvious shrinkage marks, and corrugation on the surface of the outer rib, which affects the appearance and performance

Method used

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  • Combined coating mold for Krah pipe
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Experimental program
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Effect test

Embodiment 1

[0024] In this embodiment, the ratio of the length of the straight section of the front end 12 of the die 1 to the inner diameter of the die is 1:7, and the extrusion compactness of the material flow can also be improved by enlarging the length of the front end 12 of the die. Make the material flow stable; and design the ratio of the length of the transition section 15 to the front end 12 of the die to be 1:5, the transition section 15 makes the wall thickness of the front end 12 of the die decrease linearly, by reducing the wall thickness of the front end 12 of the die , reduce the coating gap between the PP single-wall corrugated pipe 4 and the "O" type HDPE belt layer 3, prevent the "O" type HDPE belt layer 3 from curling inwardly due to the excessive gap, and improve the smoothness of the coating surface.

Embodiment 2

[0026] In this embodiment, the ratio of the length of the straight section of the front end 12 of the die 1 to the inner diameter of the die is 1:6, and the extrusion compactness of the material flow can also be improved by enlarging the length of the front end 12 of the die. Make the material flow stable; and design the ratio of the length of the transition section 15 to the front end 12 of the die to be 1:6, the transition section 15 makes the wall thickness of the front end 12 of the die decrease linearly, by reducing the wall thickness of the front end 12 of the die , reduce the coating gap between the PP single-wall corrugated pipe 4 and the "O" type HDPE belt layer 3, prevent the "O" type HDPE belt layer 3 from curling inwardly due to the excessive gap, and improve the smoothness of the coating surface.

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Abstract

The invention provides a combined coating mold for a Krah pipe, and relates to the technical field of pipeline production equipment. The combined coating mold comprises a mouth mold and a pipe core. Through the structural design of the mold, the outer side of a lining pipe can be uniformly coated with an O-shaped HDPE belt layer, the coating appearance is smooth, the corrugation phenomenon on the surface of an outer rib is improved, the product quality is improved, and the practicability is high.

Description

technical field [0001] The invention belongs to the technical field of pipeline production equipment, and in particular relates to a combined covering mold for carat pipes. Background technique [0002] Hot winding high-density polyethylene (HDPE) winding structure wall pipe, also known as carat pipe, is one of the main pipes used for municipal drainage and sewage. It adopts hot winding forming technology to spirally wind the pipe wall and outer rib at the same time. The pipe wall is made of HDPE belt. The outer rib is composed of an inner liner (PP single-wall corrugated pipe) and an "O"-shaped HDPE tape layer. The outer rib is wound on the outside of the pipe wall, and the two form a structural wall by thermal bonding. [0003] Usually, the front end of the die is straight and hollow cylindrical. The length design of the straight section will affect the extrusion quality. The length of the straight part is generally 2-6 times the inner diameter of the die. If the inner dia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C48/30B29C48/151B29L23/00
CPCB29C48/30B29C48/151B29L2023/22
Inventor 马鑫陈晓梅陈文彬彭伏弟林知曹静李文权高洁
Owner 福建亚通新材料科技股份有限公司