Method for application of a film at an envelope window made of a sheet or a portion of sheet
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United States of America Patent
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Nov 12, 2013
Grant Date -
Aug 23, 2012
app pub date -
Oct 19, 2010
filing date -
Oct 20, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
The method relates to application of a transparent film (3) to a window (2) realized in a portion of paper (1), the portion of paper (1) being defined in a continuous strip (10) destined to be wound in a reel. The film (3) exhibits larger dimensions than the window (2), such that a frame (30) is defined about the window (2), a total thickness of which is given by the portion of paper (1) plus the film (3). The method includes a stage of pressing with which at least a part of the frame (30) is brought to a total thickness which is not greater than an original thickness of the portion of paper (1). This enables the strip (10) to be wound strictly adheringly in the various spires thereof.
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