Improved coextruder for forming multi-layer composite plastic pipe

Abstract

An improved co-extruder for forming composite multi-layer plastic pipe features its modular structure, and is composed of feeder body consisting of several feeding modules, die body consisting of multiple screw distribution cores, die outlet assembly for different sizes, and connection adapter for connecting said die body with die outlet assembly. A layer thickness regulator is used for the distribution cores. Its advantages include multiple purposes, high homogenizing effect of materials, simple structure and high accuracy of layer thickness.

Description

technical field [0001] The invention relates to a multi-layer composite plastic pipe co-extrusion molding device, in particular to a three-layer composite plastic pipe co-extrusion molding device. Background technique [0002] The multi-layer composite plastic pipe molding devices disclosed in Chinese patents 86108107, 97226308, and 98208800 are all composed of a co-extrusion feeding device, a feeder, and a forming die. This multi-layer composite co-extrusion molding device, each part and The combination adopts a fixed configuration, and a molding device of one specification can only adapt to the production of composite pipes with small changes in pipe diameter and wall thickness. Therefore, the processing range of the device is narrow and the production flexibility is poor. Secondly, this type of forming device adopts the support-type material separation co-extrusion molding method, that is, the materials of each layer are separated through the support and then merged to fo...

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Problems solved by technology

[0002] The multi-layer composite plastic pipe molding devices disclosed in Chinese patents 86108107, 97226308, and 98208800 are all composed of a co-extrusion feeding device, a feeder, and a forming die. This multi-layer composite co-extrusion molding device, each part and The combination adopts a fixed configuration, and a molding device of one specification can only adapt to the production of composite pipes with small changes in pipe diameter and wall thickness. Therefore, the processing range of the device is narrow and the production flexibility is poor.

Secondly, this type of forming device adopts the support-type material separation co-extrusion molding method, that is, the materials of each layer are separated through the support and then merged to form. The forming pipe is easy to produce melting line; the second is this kind of material distribution method, the material mixing and homogenization effect and the uniformity of the flow are poor

The above two major deficiencies will affect the physical and mechanical properties of the formed pipe

Furthermore, in this co-extrusion molding device, the adjustment of the thickness of each layer of the composite pipe can only be realized by adjusting the extrusion volume of the extruder. This adjustment is poor in precision and affects the full play of the efficiency of the extruder.

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