Method of forming curved transparent cellulose diacetate visor h

Details Method of forming curved transparent cellulose diacetate visor h Method of forming curved transparent cellulose diacetate visor h

1989-06-20

1991-06-11

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Composite or multiple layer

264 27, 264510, 264134, B29C 5114

Patent

active

050230239

ABSTRACT:
An electric heater is silk screened on an interior surface of a cellulose diacetate visor by applying silk screening ink through a silk screen mask to a flat cellulose diacetate blank. The ink is then dried by being heated to between 120.degree. F.-150.degree. F. for about 20 seconds, preferably by air jet drying. The cellulose diacetate sheet is then formed into visor shape and cured by heating in an oven at about 325.degree. F. for about 20 minutes on a drape and/or vacuum form. The temperature of the visor during the drying, as well as bending and curing stages, is carefully controlled to assure proper application of the ink as well as the mechanical integrity and transparency of the visor.

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