Co-extrusion die head for extruding profiled bars with co-extrusion surface

Abstract

The invention relates to a co-extrusion die head for extruding profiled bars with a co-extrusion surface, comprising a machine neck, a transition plate, a supporting plate, a compressing plate, a pre-forming plate, a forming plate and an embedded lump; the pre-forming plate is provided with a co-extrusion flow passage; the co-extrusion flow passage comprises a main flow passage, a sector sub-flowpassage expanded towards the two sides of the die cavity co-extrusion surface, and co-extrusion parallel sections leading to the die cavity co-extrusion surface; the sector sub-flow passage is internally provided with a flow-choking piece protruded towards the inner part of the flow passage so as to form a material storage pool in which the section is wider than the co-extrusion parallel sectionsbetween the flow-choking piece and the co-extrusion parallel sections. The flow-choking piece can initially split the co-extrusion materials into flows, and the material storage pool can split the co-extrusion materials into flows again after the co-extrusion materials are combined so as to form section bars with uniform co-extrusion layers.

Description

technical field [0001] The invention relates to a co-extrusion die head for extruding a profiled material with a co-extrusion surface. Background technique [0002] For plastic profiles that require colored material coating on the outer surface, that is, colored co-extruded profiles, such as figure 1 The upper surface of the profile shown is a colored co-extrusion surface, and the co-extrusion flow channel is usually set on the preformed plate of the co-extrusion die head. The co-extrusion parallel section leading to the co-extrusion surface of the cavity, the co-extrusion material enters the co-extrusion surface of the cavity through the main channel, the runner, and the co-extrusion parallel section to meet the base material. The co-extrusion material is heated and plasticized by the co-extrusion machine, then extruded through the co-extrusion port of the die head into the co-extrusion channel, further divided and plasticized in the co-extrusion channel, and extruded from...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of uneven co-extrusion layer caused by the inconsistent flow rate of the co-extrusion channel, and to provide a co-extrusion die head for extruding profiled materials with a co-extrusion surface, so that the material flow in the extrusion channel is uniform, Ability to obtain profiles with uniform co-extruded layers

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