Manufacturing method of PP (polypropylene) double-wall corrugated pipe

Abstract

The invention relates to a manufacturing method of a PP (polypropylene) double-wall corrugated pipe.An outer wall pipe body of the PP double-wall corrugated pipe comprises, by weight, 50-60 parts of polypropylene resin, 4-7 parts of reclaimed materials, 20-40 parts of immobilized filling materials, 4-5 parts of stearic acid, 3-5 parts of desiccants, 2-5 parts of black masterbatch and 5-10 parts of talcum powder, and an inner wall pipe body of the PP double-wall corrugated pipe comprises, by weight, 45-65 parts of polypropylene resin, 4-7 parts of reclaimed materials, 20-40 parts of immobilized filling materials, 4-5 parts of stearic acid, 3-5 parts of desiccants, 2-5 parts of blue masterbatch and 5-10 parts of talcum powder.The manufacturing method includes mixing the raw materials doubly, feeding in a vacuum manner, forcibly feeding regularly and quantitatively, extruding the mixed raw materials in a twin-cone twin-screw extruder, subjecting extruded pipe blanks to shaped drawing on a molding machine by segmented control while a flaring forming process is conducted, and cutting.The manufacturing method of the PP double-wall corrugated pipe has the advantages that production can be conducted continuously, a good plasticizing effect is achieved to enable the manufactured double-wall corrugated pipe to be uniform, yield is stable and quality of the finished pipe can be improved.

Description

technical field [0001] The invention relates to the field of engineering plastics processing and manufacturing, in particular to a method for manufacturing a high-density polypropylene double-wall corrugated pipe. Background technique [0002] Double-wall corrugated pipe is a new type of lightweight pipe made of high-density polyethylene. It has the characteristics of light weight, high pressure resistance, good toughness, fast construction, and long life. Its excellent pipe wall structure design is different from other structures. Compared with pipe materials, the cost is greatly reduced. And because the connection is convenient and reliable, it is widely used at home and abroad. A large number of concrete pipes and cast iron pipes can be replaced, but with the existing production process of double-wall corrugated pipes, it is impossible to produce large-diameter double-wall corrugated pipes, especially double-wall corrugated pipes with an outer diameter of 600mm. The reas...

AI Technical Summary

Problems solved by technology

A large number of concrete pipes and cast iron pipes can be replaced, but with the existing production process of double-wall corrugated pipes, it is impossible to produce large-diameter double-wall corrugated pipes, especially double-wall corrugated pipes with an outer diameter of 600mm. The reasons are as follows: Problems with technology and molding equipment. In the production of large-diameter double-wall corrugated pipes, most of them are currently mixed with polyethylene raw materials. The ring rigidity and ring flexibility are poor. The existing technology uses a single-screw extruder to extrude the pipe, which is easy to flow back , the output is unstable, and the quality of the double-wall corrugated pipe produced is not high