摘要:
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.
摘要:
A method and an apparatus for reducing web tension change during intermittent driving of a transfer film in a film transfer unit, include severely impairing the web tension by contact sections before and after a transfer nip of the film transfer unit as the transfer film runs through a channel at the transfer nip. In order to reduce the web tension changes, front and/or rear guide elements before and after the transfer nip are moved time-asynchronously in relation to one other in order to at least reduce web tension fluctuations of the transfer film as it passes through the transfer nip.
摘要:
A transfer device for transferring a transfer layer to a printing material includes a transfer module disposed above a basic module. A guide system provides a way of easily and safely moving the transfer module within the foil transfer device or to a further foil transfer device in the same pressroom. The guide system includes tracks that are connected to the transfer module through rollers of a guide frame.
摘要:
A film transfer device guides a transfer film at least partly around a transfer cylinder having a channel. As a result of entrainment of the transfer film by an edge region of the channel during indexing, considerable impairment to web tension occurs, requiring an indexing speed to be reduced so as not to cause damage to the film. In order to increase an indexing frequency, in one region, i.e. more precisely in an edge region of the channel of the transfer cylinder, a coating is provided having such a nature that it at least reduces an adhesion of a rear side of the transfer film to the edge region of the channel, i.e. to the transfer cylinder in this case. In this way, the film slides better off the edge region of the channel and a higher indexing speed can be achieved.
摘要:
A film transfer unit is provided on an inking unit of a printing unit. If such a film transfer unit includes an intermittent drive device having dancers then, as a result, access to an ink fountain or an inking unit is generally rather restricted. Adjustable guide elements of the intermittent drive device are provided in a frame of an intermittent drive module which can be pushed, in the form of a cassette, out of an opening of the film transfer unit when the film transfer unit is not to be used to transfer a transfer layer from a transfer film to a printing material, so that an installation space which has thus become free can be used to operate an ink fountain of the inking unit. A cassette for a film transfer apparatus and a method for operating a film transfer apparatus, are also provided.