Method of manufacturing a photographic reflecting support

Details Method of manufacturing a photographic reflecting support Method of manufacturing a photographic reflecting support

1986-02-10

1987-10-13

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

2642106, 2642358, 2642902, 264345, 264DIG69, B29B 1302, B29C 4736

Patent

active

046997440

ABSTRACT:
A method of manufacturing a photographic reflecting support wherein chips and/or resin scraps of a thermoplastic resin are heat-treated in a vacuum and fed into an extruder to be melted and then extruded in the form of a sheet out of the die of the extruder. The resulting sheet is then cooled and solidified on a cooled casting drum and stretched 6 to 16 times in terms of area, lengthwise and then widthwise or vice versa, or biaxially at the same time, at a temperature within the range of from a temperature not lower than the glass transition point of the thermoplastic resin to a temperature not higher than 150.degree. C. The stretched sheet is then thermoset at a temperature within the range of from a temperature not lower than 170.degree. C. to a temperature of the melting point of the thermoplastic resin and the resulting photographic reflecting support is made from 40 .mu.m to 300 .mu.m in thickness and not higher than 20% in visible-wave-length range transmittance.

REFERENCES:
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patent: 3627625 (1971-12-01), Jarrett
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patent: 4409167 (1983-10-01), Kolouch et al.
patent: 4569885 (1986-02-01), Yamaguchi et al.

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