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    • 1. 发明授权
    • Multi-layer plastic pipe and method and apparatus for extrusion thereof
    • 多层塑料管及其挤出方法和装置
    • US5518036A
    • 1996-05-21
    • US315276
    • 1994-09-29
    • Jimmie G. DeMastersLeonard A. Fears
    • Jimmie G. DeMastersLeonard A. Fears
    • B29C47/06B29C47/20E03B7/00
    • B29C47/0023B29C47/065B29C47/20B29C47/263B29K2023/06B29K2105/16B29K2995/003
    • A method and apparatus for extruding a multi-layer plastic pipe are provided wherein a second liquified plastic is injected into and through a prow and, subsequently, into a radial flow conduit of a die assembly in which a first liquified plastic flows through the radial flow conduit. Subsequently, the first and second liquified plastic are introduced into and through an annular flow conduit and a third liquified plastic is injected into the annular flow conduit of the die assembly. Wherein within the die assembly the first liquified plastic forms a first layer, the second liquified plastic forms a second layer inside the first layer and the third liquified plastic forms a third layer outside the first layer. Additionally, a multi-layered plastic pipe which can be produced by the inventive die assembly is provided. The multi-layered plastic pipe has an ultraviolet light-protective outer layer and a light-reflecting inner layer.
    • 提供了一种用于挤出多层塑料管的方法和设备,其中将第二液化塑料注入并穿过歧管并随后注入模具组件的径向流动导管中,其中第一液化塑料流过径向流 导管。 随后,将第一和第二液化塑料引入并通过环形流动管道,并将第三液化塑料注入模具组件的环形流动管道中。 在模具组件内,第一液化塑料形成第一层,第二液化塑料在第一层内形成第二层,第三液化塑料在第一层外部形成第三层。 另外,提供了可以通过本发明的模具组件制造的多层塑料管。 多层塑料管具有紫外线防护外层和光反射内层。