Method of making watermarks on synthetic paper

Details Method of making watermarks on synthetic paper Method of making watermarks on synthetic paper

1994-11-28

1996-07-16

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Direct application of electrical or wave energy to work

Limited to treatment of surface or coated surface

264 21, 264448, 264132, 264175, 2642107, 264284, 2642902, 26417113, 427157, 425363, 425385, B29C 4706, B29C 5904, B29C 5512

Patent

active

055364683

ABSTRACT:
A process is provided for creating a watermark on a polymeric sheet. The sheet is passed between abutting rollers, at least one of said rollers having a recessed and/or raised motif, to form an impression on the sheet corresponding to the motif, and then orienting by stretching the sheet. The impressed and oriented sheet has dark areas corresponding to the raised portions and light areas corresponding to recessed portion of the motif.

REFERENCES:
patent: 3664780 (1972-05-01), Fairbanks et al.
patent: 3850667 (1974-11-01), Tani et al.
patent: 3876735 (1975-04-01), Bontinck et al.
patent: 4520063 (1985-05-01), Simon et al.
patent: 5275870 (1994-01-01), Halope et al.
Derwent Database Abstract, JP-B-57049373.

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