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Processing technology of ultra high molecular weight polyethylene pipe

Aug 20, 2019

Many people may not know much about ultra-high molecular weight polyethylene pipes, but when it comes to survival pipes, oil pipelines, etc., this product has these uses, and its form and nature are different in different occasions. Therefore, it is necessary to carry out different processing and transformation. The following describes its processing technology in detail. You can find out:

1. Extrusion modification processing

Extrusion molding equipment mainly includes a plunger extruder, a single screw extruder and a twin screw extruder. The twin-screw extrusion uses a co-rotating twin-screw extruder.

When processing the ultra-high molecular weight polyethylene pipe, when the material is extruded from the die, a certain retraction occurs due to the elastic recovery, and there is almost no sagging phenomenon, so it is a hollow container, especially a large container such as a fuel tank. The blow molding of the vats created favorable conditions. Ultra-high molecular weight polyethylene (UHMW-PE) blow molding can also lead to high-performance films with balanced strength in the longitudinal and transverse directions, thus solving the problem that HDPE films have long been inconsistent in the longitudinal and transverse directions and are prone to longitudinal damage.

2, solvent method extrusion spinning processing

The ultrahigh molecular weight polyethylene is dissolved in a suitable solvent to form a semi-dilute solution, which is extruded through a spinning orifice, and then the spinning solution is quenched with air or water to solidify into a frozen collagen filament. In the frozen collagen filament, almost all of the solvent is contained therein, so the unwrapped state of the ultrahigh molecular weight polyethylene (UHMW-PE) macromolecular chain is well maintained, and the temperature of the solution is lowered, resulting in a super high in the jelly colloid. Formation of molecular weight polyethylene (UHMW-PE) folded chain crystals. In this way, by stretching the frozen collagen filaments by ultra-heating, the macromolecular chains can be sufficiently oriented and highly crystallized, thereby converting the macromolecules in the folded chain into the extended chains, thereby producing high-strength, high-modulus fibers.

Due to the special nature of UHMWPE pipe material, it cannot be processed by common methods. However, with the advancement of technology, it has been able to transform it. The above is the processing technology of this equipment. I believe everyone is The product has also been further recognized.