Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1979-11-21
1981-08-11
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
264 11, 264212, 264216, 264236, 264240, 264338, 425224, B29D 702, B29D 900
Patent
active
042833639
ABSTRACT:
A process for making sheets of plastic material of high optical quality by casting the plastic material or a mixture of its components on a flat, moving substrate is disclosed. According to the invention, a stable pocket of material is formed on the moving substrate upstream of the zone at which the plastic material flows from the casting apparatus onto the substrate. The material in the pocket moves in predetermined paths and leaves the pocket to form the lower portion and the edges of the sheet. A direct stream of material is simultaneously formed downstream of the zone of delivery of the plastic material onto the substrate in a tangential relation to the meniscus, to form the upper portion of the sheet.
REFERENCES:
patent: 1921953 (1933-08-01), Stephens
patent: 2344603 (1944-03-01), Czapek
patent: 2932855 (1960-04-01), Bartlett et al.
patent: 3038209 (1962-06-01), Hunter, Jr. et al.
patent: 4145173 (1979-03-01), Pelzer et al.
Boudenant Pierre
Scholl Heinz
Zortea Michel
Saint-Gobain Industries
Synnestvedt John T.
Thurlow Jeffery R.
Weber Richard D.
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