Process for extruding low density foam using water as a blowing

Details Process for extruding low density foam using water as a blowing Process for extruding low density foam using water as a blowing

1994-06-07

1997-03-04

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 51, 264 53, B29C 4420

Patent

active

056076290

ABSTRACT:
In a process for extruding a low density foam, a foamable thermoplastic elastomer such as a thermoplastic rubber is selected. The selected thermoplastic elastomer is then fed into a heated extruder barrel where it is compressed and melted by the action of a screw. A blowing agent consisting of water is introduced into the melted thermoplastic elastomer. The melted thermoplastic elastomer and the water are thoroughly mixed and then cooled to a uniform, predetermined temperature. The mixture is then forced through a die to form an extruded foam profile.

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