Backing sheet

Details Backing sheet Backing sheet

1977-11-10

1980-07-08

Bell, James J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including aperture

355 73, 428138, 428192, 428193, 428246, 428250, 428252, 428304, 430523, 430533, 430496, B32B 700

Patent

active

042118085

ABSTRACT:
A backing sheet or mat for use in the exposure of photosensitive materials under vacuum conditions, includes a sheet of porous, woven fabric having a nonreflective surface, a sheet of flexible, but substantially rigid, polymeric material beneath the fabric sheet, and a sheet of flexible rubber material beneath the polymeric sheet. Each of the sheets is attached together to form the backing sheet and a plurality of apertures extend through the thickness of the sheets of polymeric and rubber material and are arranged over substantially the entire area of the latter sheets.

REFERENCES:
patent: 3413180 (1968-11-01), Smith
patent: 3416948 (1968-12-01), Maurer
patent: 3829343 (1974-08-01), Remmert
patent: 3881045 (1975-04-01), Strunk
patent: 3983287 (1976-09-01), Gossen et al.

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