06936200 is referenced by 4 patents and cites 14 patents.

A process for producing plastic/wood fiber composite foamed structures includes the steps of pre-drying wood fiber filler; mixing it with plastic to form a mixture; feeding the mixture into an extruder; introducing and mixing a blowing agent; subject the mixture to high shear forces and extruding the mixture to produce a plastic/wood fiber composite foamed structure. The filler has a degradation temperature and an active volatization temperature. During the pre-drying step the temperature is maintained below the degradation temperature. During the mixing step the mixing temperature is maintained below the active volatilizing temperature. During the introducing and mixing step a blowing agent is introduced into the plastic/wood fiber mixture and is mixed therewith to produce a plastic/wood fiber/gas mixture. During the subjecting step the plastic/wood fiber/gas mixture is subjected to high shear forces in the presence of high pressures and the temperature is maintained below an active volatilizing temperature.

Title
Plastic wood fiber foam structure and method of producing same
Application Number
10/5365
Publication Number
6936200 (B2)
Application Date
December 7, 2001
Publication Date
August 30, 2005
Inventor
Haiou Zhang
Chatham, Ontario, N7L 1E2
CA
Ghaus M Rizvi
Mississauga, Ontario, L4W 2M8
CA
Chul B Park
Etobicoke
CA
Agent
Hill & Schumacher
Nancy E Hill
Assignee
Haiou Zhang
CA
Ghaus M Rizvi
CA
Chul Park
CA
IPC
B29C 044/22
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