Method and apparatus for mfg. screw winded or braided steel wire enhanced composite plastic pipe material

Abstract

The inventive method includes: spiral winding wire and weaving wire on the surface of the core tube made of polyethylene or silane cross-linked polyethylene; heating the wire and the core tube surface using a heating device; extruding outer tube of composite polymer and making up the spiral winding or weaving wire reinforced composite plastic tube by cooling sizing and traction cutting. The inventive device can produce wire and the spiral winding or weaving wire reinforced composite plastic tube.

Description

Technical field: [0001] The invention relates to a method for manufacturing plastic pipes, in particular to a method and device for manufacturing helically wound or braided steel wire reinforced composite plastic pipes. Background technique: [0002] In recent years, increasing winding metal wire in the plastic pipe to strengthen the existing report and use of pipe strength, as CN2313137Y discloses a metal braided into a net, combined with the inner pipe and the outer pipe into a composite pipe. CN2202838Y also discloses a composite pipe with a layer of metal braided mesh sandwiched between the inner wall layer and the outer wall layer of the pipe. However, those skilled in the art know that the surface of metal skeletons such as steel and aluminum is a polar surface, and the corrosion resistance The interface of stronger polymers such as polyethylene, polypropylene and other polyolefin materials is a non-polar surface. After the polymer is melted and coated with a metal ske...

AI Technical Summary

Problems solved by technology

CN2202838Y also discloses a composite pipe with a layer of metal braided mesh sandwiched between the inner wall layer and the outer wall layer of the pipe. However, those skilled in the art know that the surface of metal skeletons such as steel and aluminum is a polar surface, and the corrosion resistance The interface of stronger polymers such as polyethylene, polypropylene and other polyolefin materials is a non-polar surface. After the polymer is melted and coated with a metal skeleton, after cooling and shaping, the interface between the metal skeleton and the polymer continuum is actually only a This kind of mechanical cladding, the interface has no real affinity, that is, there is no bonding to form a whole. It should be said that it has not become a real composite structure or composite material, so it also affects the wider application of the pipeline, even with corrosive media. The danger of infiltration into the metal frame through the interface between the metal frame and the polymer at the cut-off pipe end, corroding the metal frame, and then breaking through the plastic outer layer on the metal frame to cause the pipe to fail

In order to solve this problem, CN2142168Y discloses a composite pipe coated with an adhesive layer between at least one winding steel wire layer and the plastic core pipe and the outer plastic, but an extruder and a die head must be added, and the bonding The agent needs to have thickness, the amount is very large, and it is very uneconomical, and CN2466468Y discloses a composite pipe formed after coating a layer of adhesive and a protective layer on the steel wire and then winding on the core pipe to compound the outer layer, but it only solves the problem of Solved the problem of steel wire and inner and outer layer compounding, but there is no tight combination between the inner and outer polymer tubes. Patent 02223171 uses a compound die to compound the adhesive layer on the surface of the core tube that has been wound with steel wire, but it can be bonded to the surface of the metal material. The materials to be combined or bonded are expensive, and the thickness of a layer of adhesive is required to be coated by an extrusion mechanism. This people have adopted more economical scheme again, with the polymer of 15 to 30% by weight of ethylene and maleic anhydride or acrylate grafting and polyethylene or polypropylene blend modification to use as continuous body, although this The scheme can produce affinity with the surface of the metal skeleton, that is, bonding, but because the proportion of addition is still high, it still affects the service temperature and corrosion resistance of the pipeline, especially the cost of the polymer continuum is still high, and the pipeline lacks competition Can not expand the scope of application

In particular, pipes with larger diameters and thick walls cannot compete with other pipes due to the large amount of grafted polymer added and the high cost.

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