Film transfer device
AssigneeHeidelberger Druckmaschinen AG
InventorAlexander Weber
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Abstract
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.
Claims22
A film transfer device, comprising:
- an applicator for applying an adhesive to at least some regions of a printing material led through said applicator;
- a transfer unit disposed downstream of said applicator, said transfer unit having a transfer cylinder and an impression cylinder, said transfer cylinder having a channel and said transfer cylinder guiding a transfer film, having a transfer layer and a carrier film, at least partly around said transfer cylinder;
- said transfer cylinder and said impression cylinder forming a transfer nip for transferring the transfer layer of the transfer film to at least some regions of the printing material;
- and
- a coating disposed in vicinity of said channel for at least reducing adhesion of a rear side of the transfer film to said transfer cylinder.
Dependencies are inferred from the claim text.