Forming process for light gauge polymer sheet material

Details Forming process for light gauge polymer sheet material Forming process for light gauge polymer sheet material

1981-07-27

1984-04-17

Kimlin, Edward C.

Plastic and nonmetallic article shaping or treating: processes

Disparate treatment of article subsequent to working,...

Effecting temperature change

264285, 264DIG66, 206312, 156227, B29C 2500, B29C 1702, B65D 8530, B31F 100

Patent

active

044433980

ABSTRACT:
A method for cold-forming light gauge polymer sheet material by application of localized heat to the area of the fold. In the manufacture of Lexan polycarbonate flexible magnetic disk jackets, heat is applied to the folded edge by a heating element generally maintained uniformly at 375.degree. F. The heating element contacts the folded Lexan polycarbonate edge in a U-shaped trough having planar sidewalls generally perpendicular to a planar bottom wall.

REFERENCES:
patent: 2892217 (1959-06-01), Luboshez
patent: 3200182 (1965-08-01), Hechethammer
patent: 3696187 (1972-10-01), Glassman
patent: 4002519 (1977-01-01), Moseley et al.
patent: 4153665 (1979-05-01), Vecchiotti et al.
patent: 4304621 (1981-12-01), Appoldt et al.
G. E. Technical Marketing-Sheet Products-Primer L-28 p.

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