METHOD FOR PRODUCING AT LEAST ONE WINDOW OPENING IN AN ELONGATE PAPER SUBSTRATE, AND APPARATUS
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United States of America Patent
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Issued Date -
Dec 31, 2009
app pub date -
Jul 27, 2007
filing date -
Aug 9, 2006
priority date (Note) -
Abandoned
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Abstract
The invention concerns a method of and an apparatus for producing at least one window opening (7) in an elongate paper substrate (1) which is virtually subdivided into paper sheet portions transversely with respect to its longitudinal axis. The method includes the following steps: a) the paper substrate (1) is provided with at least one water mark (2) per paper sheet portion; b) the position of at least one water mark (2) on the paper substrate (1) is detected by means of at least one sensor unit (3); and c) the paper substrate (1) is now fed to a unit for producing openings in the paper substrate (1), which unit is actuated in such a way that at least one window opening (7) is produced per paper sheet portion in the paper substrate (1) on the basis of the position of the at least one water mark (2), that is detected by the at least one sensor unit (3).
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