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(11) | EP 0 054 907 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Paper containing fine weakened tear line and method for manufacture of the paper |
| (57) A novel paper containing a fine weakened tear line and a method for the manufacture
of the paper are disclosed. The fine weakened tear line for facilitating the tearing
of the paper along this tear line is formed by causing a paper-weakening liquid which
comprises a cellulose-degrading agent and water to be applied in a fine line to the
paper surface and allowing the liquid to penetrate the paper in the direction of the
thickness of paper thereby causing the liquid to degrade chemically the portion of
cellulose of paper underlying the area of the fine line of liquid applied to the paper
surface. Effective application of the liquid to the paper and consequent penetration
of the liquid through the paper are accomplished advantageously under the pressure
applied to the paper by use of a line-printing plate or a paper-incising pen. |