DUPLICATION-PROOF PAPER USING SPACED APART LINE SETS WITH HORIZONAL AND EXPANDED LINE PORTIONS

摘要

A duplication-proof paper with alerting effects includes a paper proper and line sets arranged on an external surface of the paper proper. The line sets are spaced apart by a preset distance and each include an upper line and a lower line. The upper line has a preset width and comprises a horizontal line portion and an upward expanded line portion extending upward and outward from the horizontal line portion. The lower line has a preset width and comprises a horizontal line portion and a downward expanded line portion extending downward and outward from the horizontal line portion and corresponding in position to the upward expanded line portion. The horizontal line portions are spaced apart by a preset distance. The upward expanded line portion and the downward expanded line portion have an expansion zone defined therebetween and are spaced apart by a preset distance. The expansion zones form a pattern.