Method for reducing register errors on a web of material moving through the printing nip of a multi-color web-fed rotary printing press and corresponding devices
OwnerThomas Potzkaiinventor
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Abstract
Register errors on a web of material which is moving through the printing nip of a multicolor web-fed rotary printing press are reduced. This is accomplished by providing a portion of the web of material, what is located between the web lateral edges of the web and areas in the vicinity of the lateral edges of the web, with a deformation relative to each other. Such deformations are directed perpendicularly to a plane of rotation of the web of material which is subject to a register error occurring in the direction of rotation of the web of material.
Claims22
A method for reducing register errors on a web of material passing through a printing gap of a multi-color, web-fed rotary printing press including:
- providing a bendable roller;
- looping said web of material around said bendable roller in a direction of web travel at a loop angle;
- and
- establishing a curvature of said bendable roller as a function of a register error occurring in said running direction of said web of material.
Dependencies are inferred from the claim text.