Mouth mold and mold for forming plastic pipe material

Abstract

The invention relates to a mouth mold and mold for forming a plastic pipe material. The mouth mold comprises a mold bell mouth supporting ring, a mold socket ring and a polytetrafluoroethylene ring. The inner side face of the mold socket ring is sleeved with the polytetrafluoroethylene ring; the bottom of the polytetrafluoroethylene ring extends outwards to form a connecting platform, and the endface of the connecting platform is provided with a dovetail groove; and the bottom of the mold socket ring extends outwards to form a spliced table which is matched with the dovetail groove. Accordingto the mouth mold and mold for forming the plastic pipe material, due to the inner side face of the polytetrafluoroethylene ring, sizing on the plastic pipe material is formed, so that the surface quality of the plastic pipe material can be improved; meanwhile, by forming the dovetail groove in a connection table, in cooperation with a spliced table at the bottom of the mold socket ring, the spliced table is made matched with the dovetail groove, and therefore due to the structural design of the dovetail groove and the spliced table, during heating expansion and deforming, the spliced table expands, the size of the dovetail groove changes small, and the spliced table and the dovetail groove can be matched more closely, so that the inner diameter size and the quality of polytetrafluoroethylene ring can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of plastic pipe forming molds, and more specifically, to a die and mold for forming plastic pipes. Background technique [0002] At present, in the production of plastic pipes such as PE, PPR, PVC, etc., most of them need to be formed by extrusion of an extruder, and the extrusion die must be kept at a certain temperature in order to ensure stable physical and chemical changes of raw materials. , to produce pipes with stable and reliable performance indicators. [0003] Existing extrusion dies of existing extruders are all pure metal parts. When PE and PPR / PVC pipes are extruded, the stability is poor and the smoothness of the pipe wall is not enough. It also affects the aesthetics of the pipe. [0004] In order to solve the above-mentioned technical problems, people put a high-temperature-resistant polytetrafluoroethylene collar on the outer sleeve of the metal die mouth. In actual use, although the PTFE...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a die and mold for forming plastic pipes, which has a simple structure and can effectively improve the surface quality of the pipes, so as to solve the technical problem of poor surface quality of the existing plastic pipes.

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