Mouth mould and core mould structure of plastics extrusion mould

Abstract

The invention discloses a mouth mould and core mould structure of a plastics extrusion mould. The mouth mould and core mould structure comprises a mouth mould (1) and a core mould (2), wherein the mouth mould (1) is shaped like a hollow cylinder, the core mould (2) and the mouth mould (1) are coaxially arranged, and the core mould (2) is positioned in the mouth mould (1), a first annular channel (17) in which a fluid flows is formed on the inner surface of the mouth mould (1) and the outer surface of the core mould (2), meanwhile, a mouth mould insert (3) is arranged on the outlet end of the mouth mould along a direction parallel to the axial line of the mouth mould, a core mould insert (4) is arranged on the outlet end of the core mould along a direction parallel to the axial line of the mouth mould, and a second annular channel (18) in which the fluid flows is formed between the mouth mould insert (3) and the core mould insert (4), and the mouth mould insert (3) and the core mould insert (4) are made of polytetrafluoroethylene materials. By using the mouth mould and core mould structure of the plastics extrusion mould, the glossiness and the flatness of the surfaces of the inner wall and the outer wall of a plastics pipe can be greatly improved.

Description

technical field [0001] The invention belongs to the field of production and processing equipment for plastic pipes and pipes. Specifically, the invention relates to using polytetrafluoroethylene to improve the structure of a die and a core die of a plastic extrusion die. Background technique [0002] In the prior art, the die and mandrel used in the extrusion production of plastic pipes are made of steel, and the contact surface with the product—the molding surface—needs to be polished or chrome-plated. This structure makes the surface finish of the formed product not high; and after a period of use, the finish of the molding surface of the mold will also decrease (usually due to wear) or the chrome layer will be partially peeled off, worn, and scratch marks will be produced, making the product The surface finish is even worse, which will increase the energy consumption of fluid transportation or reduce the transportation volume of the pipeline; it will seriously affect the ...

AI Technical Summary

Problems solved by technology

This structure makes the surface finish of the formed product not high; and after a period of use, the finish of the molding surface of the mold will also decrease (usually due to wear) or the chrome layer will be partially peeled off, worn, and scratch marks will be produced, making the product The surface finish is worse, which will increase the energy consumption of fluid transportation or reduce the transportation volume of the pipeline; seriously affect the sales of products and exceed the calibration requirements

The maintenance of the die and core mold requires a long production stop time and high cost, and severe wear (such as large scratches or collisions) will also lead to the scrapping of the die and core mold

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