Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Forming continuous work followed by cutting
Patent
1978-09-27
1980-11-18
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Forming continuous work followed by cutting
264522, 264153, 2642105, 264237, 264322, 264327, B29F 308
Patent
active
042345308
ABSTRACT:
A method for manufacturing thin-walled articles from crystalline thermoplastic material comprising the steps of extruding a continuous web of hot crystalline thermoplastic material at an extrusion temperature above the crystalline melting temperature range of the material, substantially immediately rapidly precooling the opposite surfaces of the web to form therealong thin supportive layers having a temperature in the range wherein the said material is not further plastically deformable and wherein further growth of crystals is essentially avoided, while the hotter core material between said layers is cooled to a temperature adjacent to but above the crystalline melting temperature range and is held in a substantially crystal free condition, transporting the so precooled web into a thermoforming station within a sufficiently short time period to essentially maintain over the web thickness the above mentioned temperature profile produced by precooling, and then thermally forming at a rapid cooling rate said web to an article of desired shape to essentially control growth of crystals in said material while cooling down through the crystalline melting temperature range.
REFERENCES:
patent: 2642627 (1953-06-01), Mann et al.
patent: 3157719 (1964-11-01), Ferrari
patent: 4039609 (1977-03-01), Thiel et al.
patent: 4086045 (1978-04-01), Thiel et al.
Geppert Barbara
Thiel Alfons W.
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