# US 4,400,418 A · Cylindrical covering fabric for a damping form roller of an offset printing machine

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- Number: US 4,400,418 A
- Document ID: US4400418A
- Status: Granted
- Kind: A
- Application number: 06/386,191
- Filed: 1982-06-07
- Granted: 1983-08-23
- Earliest claimed: 1982-06-07
- Assignees: Mmt SA
- Inventors: Hirofumi Takeda; Hirobumi Suzuki
- Web page: https://patentgrep.com/patent/US4400418A

## CPC

- D03D 3/02: Tubular fabrics
- B41N 7/04: for damping rollers
- D02G 3/04: Blended or other yarns or threads containing components made from different materials
- D02G 3/328: {containing elastane}
- D02G 3/406: {where the polymeric solution is removable at a later stage, e.g. by washing}
- D03D 15/00: Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
- D04B 1/04: characterised by thread material
- D04B 1/18: elastic threads
- B41N 2207/02: Top layers
- B41N 2207/14: characterised by macromolecular organic compounds
- D10B 2321/06: polymers of unsaturated alcohols, e.g. polyvinyl alcohol, or of their acetals or ketals
- D10B 2331/04: polyesters, e.g. polyethylene terephthalate [PET]
- D10B 2331/10: polyurethanes
- D10B 2401/022: hydrophylic
- Y10T 428/1362: Textile, fabric, cloth, or pile containing [e.g., web, net, woven, knitted, mesh, nonwoven, matted, etc.]
- Y10T 428/23979: Particular backing structure or composition
- Y10T 428/249922: Embodying intertwined or helical component[s]
- Y10T 428/2925: Helical or coiled
- D03D: WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- B41N: PRINTING PLATES OR FOILS (photosensitive material G03); MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
- D02G: CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D04B: KNITTING
- D10B: INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A cylindrical covering fabric for a damping form roller of an offset printing machine is manufactured by weaving, as ground yarn, yarns composed of polyurethane fibers drafted to at least twice of free length, water-soluble fibers and water-insoluble fibers coiling around the above-mentioned polyurethane fiber and water-soluble fiber and, as pile yarn, hydrophilic fibers. The covering fabric is firmly mounted on a damping form roller by immersing the roller covered by the fabric in water to remove the water-soluble fibers from the ground yarns, followed by shrinking of the polyurethane fibers.

## Claims

### Claim 1

A cylindrical covering fabric for a damping form roller of an offset printing machine, which comprises ground yarns and hydrophilic pile yarns woven together, said ground yarn being composed of polyurethane fibers drawn to at least twice their free length, water-soluble fibers and water-insoluble fibers coiling around said polyurethane fibers and water-soluble fibers.

### Claim 2 (depends on 1)

A cylindrical covering fabric of claim 1, in which said water-soluble fibers are water-soluble polyvinyl alcohol fibers.

### Claim 3 (depends on 1)

A cylindrical covering fabric of claim 1, in which said water-insoluble fibers are polyester fibers or water-insoluble polyvinyl alcohol fibers.

### Claim 4 (depends on 1)

A cylindrical covering fabric of claim 1, in which polyurethane fibers have been drawn to 2 to 5 times their free length.