Pipes and tubular conduits – Distinct layers – Bonded to each other
Patent
1994-09-29
1996-05-21
Thurlow, Jeffery R.
Pipes and tubular conduits
Distinct layers
Bonded to each other
264 19, 26417128, 2642094, 2642098, 4251311, 425462, 425467, E03B 700, B29C 4706, B29C 4720
Patent
active
055180361
ABSTRACT:
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.
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DeMasters Jimmie G.
Fears Leonard A.
Cross Ryan N.
Phillips Petroleum Company
Thurlow Jeffery R.
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