Verbatim Corporation

Mark R Garrison

Lawrence G Martinelli

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.

Forming process for light gauge polymer sheet material

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 corner by a heater bar generally maintained uniformly at 375.degree. F. The heater bar contacts the folded Lexan polycarbonate edge in a U-shaped trough having planar side walls generally perpendicular to a planar bottom wall.

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Santa Clara, CA, United States of America

Mark R Garrison