Photographic base paper

Details Photographic base paper Photographic base paper

1991-09-24

1992-06-30

Schwartz, Pamela R.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428211, 428513, 428535, 4285375, 430271, 430531, 430538, G03C 1775

Patent

active

051261871

ABSTRACT:
Photographic base paper comprising a surface ply 1 of photographic grade paper and at least one backing ply 3 of a stronger paper such as a kraft paper provides smoothness and rigidity at least as good as conventional wholly photographic grade paper at reduced raw materials cost. Preferred weight of the surface ply is a range of from 20 to 50 gm.sup.-2.
The paper can be made on a two-wire Fourdrinier machine (FIG. 5) or on a single wire machine with a secondary headbox (FIGS. 6 and 7).

REFERENCES:
patent: 812204 (1906-02-01), Hoffsummer
patent: 3885962 (1975-05-01), MacClaren
patent: 4436809 (1984-03-01), Akao et al.
patent: 4705746 (1987-11-01), Tamagawa et al.
"Present and Future Trends in Multi-Ply Formers", Tappi, vol. 56, No. 12, pp. 129-133 (Dec. 1973).

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