Composite plastic pipe, equipment for producing composite plastic pipe

Abstract

The invention discloses a composite plastic pipe comprising a pipe body, wherein the pipe body comprises an inner pipe body and an outer pipe body, a gap layer is formed between the inner pipe body and the outer pipe body; and skeletons are arranged in the gap layer. The two ends of each skeleton are respectively connected with the inner pipe body and the outer pipe body; a plurality of the skeletons are arranged at intervals around the central axis of the pipe body as a center, and adjacent skeletons and the inner pipe body and the outer pipe body form receiving through-cavities. Each receiving through-cavity is filled with a heat insulating foam material; the pipe further comprises an end cap ring, the end cap ring can covers the end of the pipe body; the end cap ring is provided with aplurality of convex blocks, and the convex blocks are externally covered with rubber layers; the convex blocks are in one-to-one correspondence with the receiving through-cavities, and the convex blocks can be in interference fit with the receiving through-cavities. The present invention also discloses equipment for producing the composite plastic pipe. The composite plastic pipe has the advantages of good heat insulation and good flame retardancy uniformity.

Description

technical field [0001] The invention relates to the technical field of pipes, in particular to composite plastic pipes and equipment for producing the composite plastic pipes. Background technique [0002] As an important part of building materials, plastic pipes are widely accepted by users for their superior performance, hygiene, environmental protection, and low consumption. They mainly include UPVC drainage pipes, UPVC water supply pipes, aluminum-plastic composite pipes, and polyethylene (PE) water supply pipes. Pipes, polypropylene PPR hot water pipes. [0003] The current plastic pipes generally use organic materials such as polyethylene or polypropylene as raw materials. The organic matter is easily oxidized, so the pipes also have the problem of easy aging, especially in household drainage and water supply. Water pipes are subject to temperature differences. The temperature difference can be close to 100°C. The high temperature difference will lead to accelerated a...

AI Technical Summary

Problems solved by technology

There are several problems in the preparation of thermal insulation pipes by coating: first, after the coating is cured, the thickness formed on the surface of the pipe body is usually thin, and the heat insulation effect is limited, which leads to a limited application range and cannot be applied to extreme sections; Second, the interface between the paint and the formed pipe body is limited, and it is difficult to improve the bonding effect such as crosslinking, which makes the paint easy to fall off from the surface of the pipe body, resulting in poor stability and short service life

This method has the following disadvantages: the process is complex, multiple extruders need to be equipped at the same time, the structure of the cavity of the die head is relatively high, the process parameter setting is cumbersome and difficult to control; due to the different viscosity and melting temperature of different resins, Resins with similar properties are often used for co-extrusion, and the material selection is limited; in addition, after molding, the pipe body is heavy, which is inconvenient for installation and transportation

In addition, the foaming gun is used to spray the foaming slurry into the pipe to make it foam and fill naturally, which has the disadvantage of poor filling uniformity

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