Manufacturing method of HDPE trapezoid reinforced rib winding pipe

Abstract

The invention provides a manufacturing method of an HDPE trapezoidal reinforced rib winding pipe, which is used for producing an HDPE single-hole trapezoidal reinforced rib winding pipe in the first embodiment. The manufacturing method comprises the steps that 1) PP corrugated pipes with trapezoidal cross sections are continuously produced on a trapezoidal PP corrugated pipe forming mold; (2) the PP corrugated pipes with the trapezoidal cross sections pass through a trapezoidal rib wrapping die, the wrapping die extrudes an HDPE melt wrapping layer to wrap the PP corrugated pipes, and an HDPE single-hole trapezoidal reinforced rib strip is formed; (3) the HDPE single-hole trapezoidal reinforced rib strip is pulled to a set of hot-state barrel molds to be synchronously wound with an HDPE bottom belt, specifically, the bottom belt and the lower edge of the single-hole trapezoidal reinforced rib strip are heated and pressed, and an HDPE single-hole trapezoidal reinforced rib winding pipe body and bell and spigot blanks at the two ends of the HDPE single-hole trapezoidal reinforced rib winding pipe body are integrally formed; and (4) the bell and spigot blanks pass through cutting equipment, and qualified bells and spigots are formed. According to the second embodiment, the HDPE double-hole trapezoid reinforced rib winding pipe is produced. The winding pipe has the advantages of high rigidity, high toughness, no cracking and stripping, and large current-carrying capacity.

Description

technical field [0001] The invention relates to a manufacturing method of an HDPE trapezoidal reinforcing rib winding pipe. Background technique [0002] Existing winding pipes, such as PP double-high-reinforced polyethylene winding pipes, are wound and formed on multiple rollers in a cold state. The resultant force is discontinuous, the molecular structure state on the section is quite different, there are two obvious interfaces, and there is a tendency of delamination and peeling between the interfaces, and there is a hidden danger of leakage of the pipe during use. Since the PP double-high-reinforced polyethylene winding pipe is made by cold winding, the dimensions of the two ends of the pipe are the same, and the socket interface needs to be processed twice or connected by electric fusion tape or heat shrinkable sleeve; the socket joint of the secondary processing is welded or use heat shrink sleeves to connect with the pipe body by grilling with an open flame. The sock...

AI Technical Summary

Problems solved by technology

[0002] Existing winding pipes, such as PP double-high-reinforced polyethylene winding pipes, are wound and formed on multiple rollers in a cold state. The resultant force is discontinuous, the molecular structure state on the cross-section is quite different, there are two obvious interfaces, and there is a tendency of delamination and peeling between the interfaces, and there is a hidden danger of leakage of the pipe during use

Since the PP double-high-reinforced polyethylene winding pipe is made by cold winding, the dimensions of the two ends of the pipe are the same, and the socket interface needs to be processed twice or connected by electric fusion tape or heat shrinkable sleeve; the socket joint of the secondary processing is welded or use heat shrink sleeves to connect with the pipe body by grilling with an open flame. The socket material, solder, processing temperature and pipe body material properties are all different. There is an interface at the joint, without reliable mechanical strength, easy to delaminate and peel off, and there is a hidden danger of leakage

Moreover, the PP double-high-reinforced polyethylene winding pipe is continuously produced by cold winding, and the inner surface will be uneven at the overlapping position. The tensile strength of the overlapping position is a weak point, which not only affects the flow rate of the medium in the pipe, but also the carrying capacity. Relatively small, it is also easy to cause the pipe body to break due to external force impact or loading and unloading during use

In the past, PP corrugated pipe forming molds used to blow up the hot-melt PP to the inner surface of the mould. The disadvantage is that the PP corrugated pipes produced by only a single blowing up have uneven thickness and poor quality.

Images