Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Starting material is nonhollow planar finite length preform...
Patent
1990-10-29
1991-12-03
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Starting material is nonhollow planar finite length preform...
264548, 264320, 264336, B29C 5142
Patent
active
050698575
ABSTRACT:
The invention is directed to a process for the production of molded articles by deep-drawing a prefabricated polyurethane(urea) part produced from a polyisocyanate polyaddition product having a specific gravity of at least 0.8 g/cm.sup.3. The part is placed inside a deep-drawing mold and pressed at a temperature of up to 230.degree. C. and a pressure of up to 1,000 bar. After the deep-drawing process, the part is subjected to a dwell time of at least 10 seconds at a temperature of up to 230.degree. C. and a pressure of up to 1,000 and is immediately thereafter removed from the mold.
REFERENCES:
patent: 2760233 (1956-08-01), Bjorksten
patent: 4125526 (1978-11-01), McCready
patent: 4250137 (1981-02-01), Riedler
patent: 4935187 (1990-06-01), Vente et al.
Elsner Thomas
Faehndrich Jurgen
Jurgens Eberhard
Rasshofer Werner
Wagner Joachim
Bayer Aktiengesellschaft
Gil Joseph C.
Heitbrink Jill L.
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