Method of forming boards of foam polyolefin using needle punchin

Details Method of forming boards of foam polyolefin using needle punchin Method of forming boards of foam polyolefin using needle punchin

1996-07-12

1998-07-07

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By mechanically introducing gas into material

264 53, 264155, 264156, 264232, B29C 4420

Patent

active

057763909

ABSTRACT:
A board of foamed polyolefin is extruded and is foamed with a blowing agent that can be halogen-free hydrocarbon or CO.sub.2. To reduce the content of blowing agent, the board is needle-punched within three hours after extrusion to a perforation depth in the range of 60 to 97% of the board thickness. Such a board has good thermal stability.

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