Mould and process for one-mould-double-output forming of polypropylene random copolymer pipes

Abstract

A mould for one-mould-double-output forming of polypropylene random copolymer pipes comprises a distributing mould and two forming moulds. The distributing mould comprises an upper mould and a lower mould which are integrally connected by a bolt, a main runner and two outwards inclined sub-runners are formed inside the upper mould and the lower mould which are symmetric, the forming moulds are D25S4.0-type pipe moulds, and the distributing mould is arranged among an extruder and the two forming moulds. A process for one-mould-double-output forming of the polypropylene random copolymer pipes adopts sectioned heating, the temperature of the distributing mould ranges from 155 DEG C to 185 DEG C, and the production speed ranges from 8.5m / min to 11.5m / min. The mould and the process have the advantages that the mould is simple in structure, the process is easy to implement, a screw is extended by the forming moulds, material flow is sufficiently homogenized, production stability is further improved, the heating temperature of the process is reduced, the performance of the pipes is ensured, the productivity of the PP-R (polypropylene) pipes can be improved by 85%-95% by the aid of the distributing mould, and obvious economic and social benefits are achieved.

Description

technical field [0001] The invention relates to the preparation technology of polypropylene pipes, in particular to a mold and process for one-mold double-out molding of random copolymerized polypropylene pipes. Background technique [0002] Random copolymerized polypropylene pipe (PP-R pipe) is a new type of plastic pipe product developed and applied in Europe in the 1990s. In addition to the characteristics of general plastic pipes such as light weight, corrosion resistance, and no scaling, PP-R pipes also It also has the advantages of good heat resistance, heat preservation and energy saving, non-toxic and hygienic, convenient installation and reliable connection. Its excellent cost performance makes it the most widely used water supply pipe in home improvement projects. [0003] PP-R pipes are produced through extrusion processing. At present, major domestic manufacturers have relatively stable molding processes, but there are generally problems such as low production e...

AI Technical Summary

Problems solved by technology

[0003] PP-R pipes are produced through extrusion processing. At present, major domestic manufacturers have relatively stable molding processes, but there are generally problems such as low production efficiency and insufficient production capacity of extruders.

If the production line speed is simply increased during the production process, problems such as pipe wall thickness fluctuations and performance degradation will occur, resulting in a decrease in production stability

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