Method of forming an article consisting of a foam core and one or more covering layers
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United States of America Patent
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Dec 20, 1994
Grant Date -
N/A
app pub date -
Jun 26, 1991
filing date -
Jul 4, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of forming in a mould an article using a thermoplastic sandwich material, which material has a core of a thermoplastic foam and one or two, optionally fiber-reinforced, covering layers of a thermoplastic resin, the method having the steps of providing in the mould a foamable thermoplastic synthetic material and said one or two fiber-reinforced covering layers, supplying a liquid to the mould at an elevated pressure and temperature, whereby the temperature of the thermoplastic synthetic material is raised to a temperature above the temperature at which the material foams, followed by lowering the pressure of the liquid and removing the liquid from the mould with foaming of the thermoplastic synthetic material.
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