Hollow composite body and its manufacturing process
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United States of America Patent
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Jun 8, 2004
Grant Date -
Jan 31, 2002
app pub date -
Jun 25, 2001
filing date -
Jul 20, 2000
priority date (Note) -
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Abstract
A hollow composite body includes a thermoplastic internal layer as a liner, a thermoplastic interlayer with embedded reinforcing fibers, and a thermoplastic external layer. The hollow body is made by furnishing the liner as a preform; introducing the preform into a mold, an inflatable bladder having been inserted into the preform; heating the preform and inflating the bladder to apply pressure against the internal wall of the preform. A space between the external wall of the preform and the internal wall of the mold is tailored to the thickness of the external layer of the hollow body to be obtained, so as to allow migration of the thermoplastic of the interlayer, and possible of the liner, beyond the interlayer.
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