Plastic and nonmetallic article shaping or treating: processes – Vacuum treatment of work – To degas or prevent gas entrapment
Patent
1997-08-29
1999-08-17
Silbaugh, Jan H
Plastic and nonmetallic article shaping or treating: processes
Vacuum treatment of work
To degas or prevent gas entrapment
264142, 26421118, 26421123, 264131, 427213, 427222, B29B 914
Patent
active
059389940
ABSTRACT:
A wood-plastic composite material is produced in a twin screw extruder with parallel intermeshing segmented screws. The screw segments are positioned on two spline shafts and perform the various required functions of mixing, deaerating and removal of moisture followed by extrusion. A polymer is fed to the main throat of the extruder where the plastic is conveyed along a barrel formed by the case of the extruder. Cellulosic fiber is positively fed into the extruder approximately one-quarter of the way down the extruder barrel by a twin screw side stuffer. A vent is provided for entrained air in the cellulosic material to escape. The molten mixture of polymer and cellulosic material is then conveyed to a devolatilization area having a first atmosphere devolatilization area and a second vacuum devolatilization area separated by a melt seal. A pumping section raises the pressure of the mixture of polymer and cellulosic material to between 1,000 and 6,000 psi which is then extruded through a multiplicity of small holes and separated into individual pellets by a four bladed rotating knife. Calcium carbonate, talc, or other mineral is blown onto the pellets as they are formed to prevent them from sticking to each other. The pellets are cooled to room temperature by a fluidized air bed which rapidly cools the pellets without immersing them in water.
REFERENCES:
patent: 1156096 (1915-10-01), Price
patent: 3012900 (1961-12-01), Kleinmann et al.
patent: 3241246 (1966-03-01), Pollock
patent: 3687899 (1972-08-01), Ackermann et al.
patent: 3791913 (1974-02-01), ver Strate et al.
patent: 3856724 (1974-12-01), O'Connor et al.
patent: 3976608 (1976-08-01), Buckler et al.
patent: 4115537 (1978-09-01), Driscoll et al.
patent: 4167503 (1979-09-01), Cipriani
patent: 4376144 (1983-03-01), Goettler
patent: 4420351 (1983-12-01), Lussi et al.
patent: 4454091 (1984-06-01), Chion et al.
patent: 4483886 (1984-11-01), Kowalski
patent: 4687793 (1987-08-01), Motegi et al.
patent: 4783493 (1988-11-01), Motegi et al.
patent: 4851485 (1989-07-01), Re et al.
patent: 4902455 (1990-02-01), Wobbe
patent: 4980232 (1990-12-01), Prevorsek et al.
patent: 5008310 (1991-04-01), Beshay
patent: 5075359 (1991-12-01), Castagna et al.
patent: 5194461 (1993-03-01), Bergquist et al.
patent: 5225489 (1993-07-01), Prevorsek et al.
patent: 5406768 (1995-04-01), Giuseppe et al.
patent: 5437826 (1995-08-01), Martinello et al.
patent: 5441801 (1995-08-01), Deaner et al.
patent: 5486553 (1996-01-01), Deaner et al.
patent: 5497594 (1996-03-01), Giuseppe et al.
patent: 5518677 (1996-05-01), Deaner et al.
patent: 5536462 (1996-07-01), Hawrylko
patent: 5539027 (1996-07-01), Deaner et al.
patent: 5574094 (1996-11-01), Malucelli et al.
patent: 5589203 (1996-12-01), Sato
patent: 5597235 (1997-01-01), Barnes et al.
English Brent W.
Gohr Kevin P.
Gohr Kevin P.
Jones Kenneth M.
Neese Willard E.
Savanuzzi Andrea
Silbaugh Jan H
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