Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – To form particulate product
Patent
1985-06-06
1987-10-13
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
To form particulate product
2642108, 2642905, 26432818, 26433121, B29B 906, B29C 4500, B29C 4700, D02J 122
Patent
active
046997458
ABSTRACT:
The present invention relates to a process for the production of thermoplastic polycarbonate injection-moulded shaped articles from polycarbonate melt strands, which is characterized in that polycarbonate melt strands are pressed through a circular orifice with a diameter of 1 to 8 mm, preferably 2 to 6 mm, and are then cooled to below their softening point, stretched in a ratio of between 1:1.5 and 1:8, preferably between 1:1.5 and 1:5, between room temperature and the softening point of the resulting polycarbonate strand, and are then granulated, and the resulting polycarbonate granules are processed in a known manner by the injection-moulding process at product temperatures of below 320.degree. C. preferably below 300.degree. C.
REFERENCES:
patent: 3005236 (1961-10-01), Reichle et al.
patent: 3007204 (1961-12-01), Veiel et al.
patent: 3026273 (1962-11-01), Engles
patent: 3424832 (1969-01-01), Chisholm
patent: 3796785 (1974-03-01), Rest et al.
patent: 4540534 (1985-09-01), Grendol
Kunststoff-Handbuch, vol. VI/Polyamide, 1966, Carl-Hanser-Verlag, pp. 336-343.
Bier Peter
Fritsch Karl-Herbert
Bayer Aktiengesellschaft
Gil Joseph C.
Harsh Gene
Preis Aron
Tentoni Leo B.
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