Machine die for extruding three-layer structure plastic pipe with oxygen barrier layer

The machine mold addresses thermal cracking issues in three-layer plastic pipe production by using a reduced volume flow channel and nesting doll structure, enhancing pipe quality and efficiency through faster heating and uniform material distribution in a single process.

CN119175864AActive Publication Date: 2024-12-24ZHEJIANG AKAN IND CO LTD
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Patent Information

Application Number
CN202411215340.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-09-02
Publication Date
2024-12-24
Estimated Expiration
2044-09-02

AI Technical Summary

Technical Problem

Existing three-layer plastic pipe extrusion processes face issues with thermal cracking of ethylene vinyl alcohol (EVOH) due to long residence times in large mold flow channels, leading to poor pipe quality and reduced oxygen barrier function, slow startup efficiency, and increased production costs.

Method used

A machine mold with a reduced flow channel volume and a three-channel buffer groove structure, combined with a nesting doll-like multi-layer co-extrusion design, ensures faster heating and uniform material distribution, reducing thermal cracking and improving production efficiency.

Benefits of technology

The new mold design enhances pipe quality by preventing thermal degradation of EVOH, improves startup efficiency, and reduces production costs through faster heating and uniform material distribution, while allowing for multi-layer pipes to be produced in a single process.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to the field of plastic pipe extrusion, in particular to a machine die for extruding a three-layer structure plastic pipe with an oxygen barrier layer, which comprises an inner-layer machine body, a middle-layer machine body, an outer-layer machine body, a machine body front end cover, a discharging machine body and a discharging part, the inner-layer feeding port is formed in the rear end of the inner-layer spiral core rod, the inner-layer spiral core rod is arranged in the inner-layer cavity, the middle-layer machine body, the outer-layer machine body and the machine body front end cover are sequentially arranged at the front end of the inner-layer cavity, the rear end of the discharging machine body is connected with the machine body front end cover, and the discharging part is further arranged at the front end of the discharging machine body. By means of the runner structure design, the oxygen barrier layer material is not prone to thermal cracking deterioration, the produced pipe is better in oxygen barrier effect, and the production and manufacturing efficiency of the pipe is greatly improved through the overall design of the machine mold and the design of the discharging part.
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Citation Information

Patent Citations

  • Bilayer is crowded tubular product mold machine head altogether

    CN205238507U

  • PP-R (polypropylene) pipe production equipment

    CN102950749A

  • Multi-layer pipe extrusion die and manufacturing method

    CN115352022A

  • Extrusion of multilayer parisons for blow moulding

    GB1527235A

  • Multiple-layered plastics pipe and method and apparatus for its production

    GB2000570A