Processing method of net framework enhanced plastic composite pipe and manufactured composite pipe

Abstract

The invention discloses a processing method of a net framework enhanced plastic composite pipe and a manufactured net framework enhanced plastic composite pipe. The processing method comprises the following steps of: compositely extruding by adopting a core pipe double-layer composite coextrusion die to obtain a double-layer composite core pipe, wherein the inner layer of the composite core pipe is plastics and the outer layer is hot melt adhesive; and directly winding the enhanced net framework with uncoated bare wires. Compared with the prior art, the invention reduces preptreatment, wire coating and over plasticizing production lines, reduces the equipment investment and the production cost and improves the product cost performance. Because the plastics for the core pipe of the inner layer of the core pipe and the hot melt adhesive of the outer layer of the core pipe are subjected to synchronous double-layer composite coextrusion, the thickness of the hot melt adhesive of the inner layer of the core pipe can be controlled, and the bare wires are completely coated between the hot melt adhesive of the core pipe outer layer and the hot melt adhesive of the inner layer of an outer protective layer, thus the bonding is firm; and the peel strength between pipes is superior to that of the industrial standard, and the product quality is reliable.

Description

technical field [0001] The invention relates to the field of building material production, in particular to a processing method for a reinforced mesh-skeleton plastic composite pipe used for pipeline transportation and a reinforced mesh-skeleton plastic composite pipe prepared by the method. Background technique [0002] Steel mesh skeleton plastic (polyethylene) composite pipe and pipe fittings CJ / T189-2007, the standard discloses a core layer formed by continuous winding of coated high-strength steel wire as a reinforced skeleton, using special hot melt adhesive, plastic A pipe compounded into one by extrusion molding. Since the reinforced skeleton of this pipe is wound with coated steel wire, the production method of this pipe is that the steel wire reinforcement uses a separate steel wire overplastic production line before the pipe is produced (such as figure 1 Shown) The bare steel wire is covered and overplasticized before processing the composite pipe. Composite pip...

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Problems solved by technology

[0003] The above-mentioned prior art composite pipe processing and production methods have the following defects: First, since the steel wire is firstly plasticized on the plastic coating production line and then wound on the main production line, it not only increases equipment investment, labor costs and power costs, but also covers plastic During the process of winding the treated steel wire to strengthen the skeleton, the hot melt adhesive covering the steel wire is prone to be scratched, peeled off from the steel wire, etc., and there is a defect of weak bonding between the steel wire and the hot melt adhesive covering the steel wire. There is a hidden danger that the steel wire is easy to draw, and it is easy to cause the steel wire to directly contact the core tube; second, after the steel wire is wound on the core tube, if the temperature control is not good, the core tube is likely to soften and the steel wire sinks on the core tube, resulting in the steel wire and the core tube The effect of direct bonding of the core tube plastic, which in turn leads to adverse phenomena such as air and water crossover; third, because the hot melt adhesive covering the steel wire and the core tube are extruded in layers, when there are special requirements for the core tube , such as the core tube of ultra-high molecular weight polyethylene has the defect that the bonding effect between the core tube and the hot melt adhesive is poor during layering and compounding

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