Cooling structure of solid-wall pipe extrusion die head

Abstract

The invention relates to the technical field of plastic forming, and particularly discloses a cooling structure of a solid-wall pipe extrusion die head. The cooling structure comprises a die sleeve (1) and a die core (2) positioned in the die sleeve (1); the die sleeve (1) comprises a front die sleeve (11) and a tail die sleeve (12); the die core (2) comprises a main core die (21) and a tail die core (22); an annular cavity (3) for material flowing is formed between the tail die sleeve (12) and the tail die core (22); the cooling structure is characterized in that a plurality of secondary core dies which can be inserted in a nested mode are arranged between the main core die (21) and the front die sleeve (11); the outer walls of the main core die (21) and the secondary core dies are provided with flow channels for materials to flow; discharge ports of the flow channels are communicated with the annular cavity (3); and cooling circulation channels for introducing a cooling medium are arranged in the secondary core dies. The cooling medium is added into the secondary core dies to cool a plastic melt, so that the sagging of the plastic melt in the annular cavity is reduced or avoided, and the problems that the surface of a plastic forming pipe is wrinkled and the thickness is not uniform after the plastic forming pipe is cooled are solved.

Description

technical field [0001] The invention relates to the technical field of plastic molding, in particular to a cooling structure for a solid-wall pipe extrusion die head. Background technique [0002] Since the plastic has no strain hardening effect in the molten state, its melt strength is low and its sag resistance is poor, so it is subject to many restrictions in molding, and it also shows many defects for the general and commonly used methods, such as thermal Uneven wall thickness of the product is prone to occur during molding, edge curling and shrinkage occur during extrusion, coating, and calendering, and cells are prone to collapse during foam molding. [0003] In view of the above problems, it is usually used to cool the extrusion mold to adjust the temperature of the plastic in the molten state in the mold to make it reach a better temperature value, so as to prevent the sag phenomenon of the plastic in the molten state. [0004] At present, there are two main cooling...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the defects existing in the prior art, the present invention provides a cooling structure for solid-wall tube extrusion dies, allowing the heat exchange interface to go deep into the melt, and solving the problem of melt insulation

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