Plastic and nonmetallic article shaping or treating: processes – Vacuum treatment of work
Patent
1990-01-10
1992-04-07
Thurlow, Jeffrey
Plastic and nonmetallic article shaping or treating: processes
Vacuum treatment of work
159 23, 264 37, 264236, 264347, 26421124, 264DIG69, 425203, 425204, 425205, B29C 4776
Patent
active
051025949
ABSTRACT:
The invention relates to a process for the processing of a thermoplastic polycondensation polymer by supplying the polymer in finely distributed form to a first vented extruder in which the polymer is devolatilized at a temperature below its melting temperature. The polymer is then placed in a second extruder where the polymer is transported below the melting temperature of the polymer over a first length of the screw from the inlet of the extruder, with constant evacuation of volatile components by means of a vacuum exhausting device at a vacuum of less than 10 mbar and the polymer is compressed and melted over a second length of the screw and then leaves the extruder as an end product of a semimanufacture.
REFERENCES:
patent: 3446772 (1969-05-01), Forster et al.
patent: 3654231 (1972-04-01), Brozek
patent: 3657195 (1972-04-01), Doerfel et al.
patent: 4474473 (1984-10-01), Higuchi et al.
patent: 4902455 (1990-02-01), Wobbe
Kunststof en Rubber, vol. 36, No. 9, Sep. 1983, pp. 47-48, Schiedam, NL.
Burlet Rudolf J. H.
Lemmens Jozef M. H.
Stamicarbon B.V.
Thurlow Jeffrey
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