Method of and apparatus for applying a mark to paper and a...

Details Method of and apparatus for applying a mark to paper and a... Method of and apparatus for applying a mark to paper and a...

B - Operations, Transporting

41

M

101/43

B41M 5/26 (2006.01) B41M 3/10 (2006.01)

Patent

CA 1275853

A METHOD OF AND APPARATUS FOR APPLYING A MARK TO PAPER AND A PAPER FOR USE IN SUCH METHOD Abstract of the disclosure A method of applying a "pseudo watermark" to paper, comprises the steps of preparing a paper containing a suitable amount of a thermally sensitive material, the presence of which renders the translucency of the paper variable by temperature change, and subsequently applying heat to a part of the surface of the paper in a manner to cause a region of the paper to become semi-translucent. Apparatus suitable for applying heat to the paper is also disclosed.

509980

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