Printing process
OwnerDennis R. Wieseinventor
Life of this patent
Estimating the term…
Abstract
The printing apparatus includes a press unit having at least one ink roller and a solvent delivery system. The ink roller has a center print area and, on one end or both ends, a non-print area. The solvent delivery system has an opening through which a suitable tack-reducing solvent for the ink is delivered to the non-print areas of the ink roller. In the printing process, tack-reducing solvent is delivered to the non-print areas of ink rollers of a printing press during operation of the press to keep the rollers free of dried, tacky ink build-up. The process uses a combination of ink and tack-reducing solvent compatible with the ink.
Claims19
A method of reducing the incidence of web breakage in web printing or reducing the incidence of sheet jamming in sheetfed printing, comprising steps of:
- (a) printing the web or sheets with a printing unit having adjacent, rotating ink rollers, said ink rollers having a central print area and terminal non-print areas, by applying ink to a first ink roller of an upper ink train of ink rollers, the ink being transferred to the print areas and non-print areas of successive adjacent ink rollers and finally printed in an image on the web or sheet substrate;
- (b) delivering a sufficient amount of a tack-reducing solvent at a pre-determined rate to the non-print areas of a member selected from the group consisting of a plate cylinder of the upper ink train, a blanket cylinder of the upper ink train, or an ink roller of the upper ink train, so that the tack-reducing solvent is transferred to non-print areas of successive adjacent ink rollers and cylinders reduce the incidence of web breakage or sheet jamming.
A method of reducing incidence of web breakage when printing super calendered paper in a lithographic printing process, comprising a step of delivering to non-print areas of the ink train a solvent that is a tack-reducing solvent for the printing ink, wherein the solvent is delivered at a pre-determined rate sufficient to reduce incidence of web breakage.
A printing apparatus for web printing or sheetfed printing, comprising:
- at least one printing unit having adjacent ink rollers, said ink rollers having terminal non-print areas, and
- a solvent delivery system for delivering a tack-reducing solvent at an adjustable rate to the non-print areas of at least one ink roller such that the incidence of web breakage or sheet jamming is reduced and such that print at the edges of print areas is not washed out.
Dependencies are inferred from the claim text.