Method and device for changing the condition of a web of foil
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United States of America Patent
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Sep 23, 2014
Grant Date -
Jun 21, 2012
app pub date -
Dec 16, 2011
filing date -
Dec 16, 2010
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A device and a method for coating a printing material include a foil engaged with a printing material on an impression cylinder using guide rollers. The foil and the printing material are guided together in an engagement area and a functional layer, such as glue or varnish, is dried, i.e. activated or polymerized, through the foil in the engagement area using a drier. The guide rollers are disengaged from the impression cylinder to avoid contact between the foil and grippers of the impression cylinder. To improve a detachment behavior of the foil from the functional layer, an angle of detachment between the foil and the sheet is varied by pivoting the guide rollers about an external geometrical pivot axis or an internal geometrical pivot axis, or at least assisting the disengagement of the foil from the impression cylinder by a change of a pneumatic condition of a foil-guiding element.
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