US 8,839,737 B2Granted

Method and device for changing the condition of a web of foil

AssigneeHeidleberger Druckmaschinen AG

InventorAlexander Weber

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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.

Claims11

Dependent claims

A method for coating a printing material using a web of foil, the method comprising the following steps:

applying a coating of glue, varnish or another functional layer to the printing material;
feeding a web of foil from a foil supply to an area of engagement using foil-guiding elements;
engaging the web of foil temporarily with the printing material in the area of engagement while guiding the printing material on a counter-surface, the counter-surface being a surface of an impression cylinder;
changing a path of the web of foil relative to the counter-surface at least from a first condition to a second condition using the foil-guiding elements to guide the web of foil;
and
implementing the change of condition by changing at least one condition of at least one of the foil-guiding elements to switch the web of foil from a first to a second condition, the change of condition of the at least one foil-guiding element being different from a disengagement of the at least one foil-guiding element from the counter-surface and being carried out without changing the radial position of the at least one foil-guiding element relative to the impression cylinder.

3 more elements

A device for coating a printing material, the device comprising:

at least one coating unit for coating the printing material with a functional layer;
an area of engagement, disposed downstream of said at least one coating unit in a transport direction of the printing material, for temporarily engaging a web of foil with the printing material;
a counter-surface for guiding the printing material during engagement with the web of foil, said counter-surface being a surface of an impression cylinder;
a guide device including foil-guiding elements for guiding the web of foil in vicinity of said counter-surface;
and
a switching element associated with at least one of said foil-guiding elements and configured to be switched for causing a change of condition of said at least one foil-guiding element, said change of condition being different than a disengagement of said at least one foil-guiding element from said counter-surface and being carried out without changing the radial position of said at least one foil-guiding element relative to said impression cylinder, and said switching of said switching element causing the web of foil to change from a first condition to a second condition.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/328,054Filed 16 Dec 2011
Priority: DE 10 2010 054 70616 Dec 2010
Published: US 2012/0152444 A121 Jun 2012
Granted: 23 Sep 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

B41F 19/001
Apparatus or machines for carrying out printing operations combined with other operations: with means for coating or laminating
B41F 23/0453
By radiation: by ultraviolet dryers
B41P 2219/22
Arrangements for moving, supporting or positioning the printing foil: guiding or tensioning the printing foil
Y10T 156/1039
With permanent bending or reshaping or surface deformation of self sustaining lamina: surface deformation only of sandwich or lamina [e.g.,…