Method for the manufacture of a material in the form of sheets o

Details Method for the manufacture of a material in the form of sheets o Method for the manufacture of a material in the form of sheets o

1986-01-22

1988-01-19

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-uniform, irregular or configured web or sheet

162117, 162140, 162204, D21H 500

Patent

active

047203250

ABSTRACT:
A material (1) in the form of sheets or a web is provided with a watermarklike pattern (12) in the form of a text, figure or similar identification mark visible or displayable in transmitted light by means of relieflike mechanical working off of material, for example grinding, milling etc., corresponding to the desired pattern (12).

REFERENCES:
patent: 159516 (1875-02-01), LaMonte et al.
patent: 1883526 (1932-10-01), Bryan
patent: 4462866 (1984-07-01), Tooth et al.

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