Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1998-01-06
1999-12-07
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264 54, 264101, 264115, 264120, 264321, B29C 4420
Patent
active
059977841
ABSTRACT:
A wood substitute material is formed by mixing a base polymer with wood fiber or wood flour together with a quantity of lignin and thereafter creating a molten material within a compounder and extruder. The molten material is extruded or injection molded to form the desired shape. Prior to extrusion or injection molding, a foaming agent is added to the molten mixture resulting in the creation of a variable density extruded or injection molded article. In the extrusion process, a conventional extrusion die is employed having a die passage which is significantly larger than the desired eventual size of the extruded article. The enlarged extrusion is thereafter cooled and reduced in sized through a series of vacuum sizers and a final water bath prior to cutting. The degree of foaming within the extruded article is controlled by the amount of foaming agent employed.
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patent: 4680328 (1987-07-01), Dohrer et al.
patent: 5249948 (1993-10-01), Koslow
patent: 5288772 (1994-02-01), Hon
patent: 5413745 (1995-05-01), Andersson
patent: 5786000 (1998-07-01), Berner
patent: 5847016 (1998-12-01), Cope
Ekstrand Roy A.
Kuhns Allan R.
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