Reimageable and reusable printing sleeve for a variable cutoff printing press
A method of forming printing sleeve for mounting on a cylinder in a printing press is provided. The method includes providing a permanent hydrophilic tubular layer on a tubular base; selectively providing a first temporary hydrophobic layer on the hydrophilic tubular layer to form a first imaged printing sleeve, the temporary hydrophobic layer forming a first image; printing, by the first imaged printing sleeve, a first print job including the first image on a substrate; and removing the first temporary hydrophobic layer from the permanent hydrophilic layer such that the permanent hydrophilic layer remains intact on the tubular base. A lithographic printing sleeve for a printing press is also provided.
1. A method of forming printing sleeve for mounting on a cylinder and printing in a printing press comprising:
providing a permanent hydrophilic tubular layer on a pneumatically expandable tubular base;
selectively providing a first temporary hydrophobic layer on the hydrophilic tubular layer to form a first imaged printing sleeve, the temporary hydrophobic layer forming a first image, the first imaged printing sleeve including tubular base, the permanent hydrophilic tubular layer and the temporary hydrophobic layer;
sliding the first imaged printing sleeve over the cylinder via pneumatic expansion of the tubular base;
securing the tubular base on the cylinder with an interference fit;
printing, by the first imaged printing sleeve, a first print job including the first image on a substrate; and
removing the first temporary hydrophobic layer from the permanent hydrophilic layer such that the permanent hydrophilic layer remains intact on the tubular base.
2. The method as recited in claim 1 wherein the selectively providing the first temporary hydrophobic layer on the hydrophilic tubular layer to form the first imaged printing sleeve comprises:
selectively depositing hydrophobic material onto the hydrophilic tubular layer; and
curing the hydrophobic material to form the first image.
3. The method as recited in claim 1 further comprising
selectively providing a second temporary hydrophobic layer on the hydrophilic tubular layer to form a second imaged printing sleeve, the temporary hydrophobic layer forming a second image different from the first image, the second imaged printing sleeve including tubular base, the permanent hydrophilic tubular layer and the temporary hydrophobic layer;
printing, by the second imaged printing sleeve, a second print job including the second image on a substrate; and
removing the second temporary hydrophobic layer from the permanent hydrophilic layer such that the permanent hydrophilic layer remains intact on the tubular base.
4. The method as recited in claim 1 further comprising
selectively providing a second temporary hydrophobic layer on a second permanent hydrophilic tubular layer of a second printing sleeve to form a second imaged printing sleeve, the second temporary hydrophobic layer forming a second image different from the first image, the second imaged printing sleeve having a different cutoff length than the first imaged printing sleeve;
printing, by the second imaged printing sleeve, a second print job including the second image on a substrate; and
removing the second temporary hydrophobic layer from the second permanent hydrophilic layer such that the second permanent hydrophilic layer remains intact on the tubular base.
5. The method as recited in claim 1 further comprising, before printing the first print job, providing a degreasing solution to the first imaged printing sleeve.
6. The method as recited in claim 1 further comprising, before printing the first print job, applying a water soluble layer onto image and non-image areas of the first imaged printing sleeve.
7. The method as recited in claim 1 wherein the removing the first temporary hydrophobic layer from the permanent hydrophilic layer includes mechanically removing the first temporary hydrophobic layer.
8. The method as recited in claim 7 wherein the mechanically removing the first temporary hydrophobic layer includes grit blasting, brushing or scraping the first temporary hydrophobic layer.
9. The method as recited in claim 1 wherein the removing the first temporary hydrophobic layer from the permanent hydrophilic layer includes chemically removing the first temporary hydrophobic layer.
10. The method as recited in claim 9 wherein the chemically removing the first temporary hydrophobic layer includes breaking down and removing the first temporary hydrophobic layer by a chemical wash.
11. The method as recited in claim 1 wherein the permanent hydrophilic layer and the temporary hydrophobic layer are continuous on the first imaged printing sleeve such that the permanent hydrophilic layer and the temporary hydrophobic layer exist in full circumference on the first imaged printing sleeve.
12. The method as recited in claim 1 wherein the permanent hydrophilic tubular layer is made from a high surface area energy hydrophilic material selected from the group consisting of titanium oxide, nickel oxide, or silicon dioxide, and wherein the temporary hydrophobic layer is made from a low surface area energy material consisting of an epoxy or a synthetic polymer.
13. The method as recited in claim 1 wherein the providing step further includes increasing the hydrophilicity by changing the surface geometry of the hydrophilic material by grinding, polishing, or electro-graining the hydrophilic material.
14. The method as recited in claim 1 wherein the selectively providing step further includes applying the temporary hydrophobic layer in multiple layers.