Method for making a part with clearance volume by rotational moulding and resulting part
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United States of America Patent
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Jul 24, 2007
Grant Date -
Aug 28, 2003
app pub date -
Aug 27, 2001
filing date -
Aug 30, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A cylindrical element is manufactured by a process which includes depositing successive layers of thermoplastic materials in a cycle by rotation moulding, or by a technique enabling a deposit of successive layers, the cycle including at least one deposit by rotation moulding or by a technique enabling deposit of successive layers at a temperature from 170 to 240.degree. C. The cylindrical element contains at least one layer containing an ethylene-vinyl alcohol copolymer with a density at the above temperature of between 0.94 and 1.4, and a melt flow index of between 1.3 and 4.2 g/10 minutes.
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