Method for manufacturing a multilayer plastic pipe
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United States of America Patent
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-
Jun 26, 2001
Grant Date -
N/A
app pub date -
Mar 14, 1997
filing date -
Nov 26, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for manufacturing a multilayered plastic pipe particularly suitable for use as an intake manifold of an internal combustion engine is provided. The method includes the steps of forming a hollow plastic core, providing at least one spacer member on the hollow plastic core, supplying a molten plastic material into a mold cavity and applying a compression force to the material inside the cavity to form an outer layer integrally on the outer peripheral surface of the hollow plastic core. The spacer member prevents the hollow plastic core in the mold cavity from being deformed when a molten plastic material is supplied into the mold cavity under pressure.
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