GB2065549A - Press blanket for offset printing machines - Google Patents

Press blanket for offset printing machines Download PDF

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Publication number
GB2065549A
GB2065549A GB8033208A GB8033208A GB2065549A GB 2065549 A GB2065549 A GB 2065549A GB 8033208 A GB8033208 A GB 8033208A GB 8033208 A GB8033208 A GB 8033208A GB 2065549 A GB2065549 A GB 2065549A
Authority
GB
United Kingdom
Prior art keywords
sheet
thickness
press blanket
printing
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB8033208A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MARKS KG ERNST
Original Assignee
MARKS KG ERNST
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MARKS KG ERNST filed Critical MARKS KG ERNST
Publication of GB2065549A publication Critical patent/GB2065549A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N10/00—Blankets or like coverings; Coverings for wipers for intaglio printing
    • B41N10/02—Blanket structure
    • B41N10/04—Blanket structure multi-layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B25/08—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B2038/0052—Other operations not otherwise provided for
    • B32B2038/0076—Curing, vulcanising, cross-linking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/582—Tearability
    • B32B2307/5825—Tear resistant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2367/00—Polyesters, e.g. PET, i.e. polyethylene terephthalate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
    • B41N2210/02—Top layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
    • B41N2210/14—Location or type of the layers in multi-layer blankets or like coverings characterised by macromolecular organic compounds

Landscapes

  • Printing Plates And Materials Therefor (AREA)

Abstract

A press blanket for offset-roller- rotary machines, comprising a filler layer (2) formed of a synthetic rubber and a printing carrier comprising a rubber-coated (3), tear-resistant synthetic sheet (1) having a low coefficient of elasticity, at least one side of the sheet being uncoated, the uncoated side being directly secured by vulcanization to the filler layer. <IMAGE>

Description

SPECIFICATION Press blanket for offset printing machines The present invention relates to a printing blanket for offset printing machines, particularly offset-roller-rotary-machines. The blanket comprises a filler layer of synthetic rubber and a printing carrier which includes a rubbercoated tear-resistant plastics material sheet or foil having a low coefficient of elasticity.
Two-layer printing blankets are known for use in offset sheet-fed presses. These press blankets include a filler support forming a lower layer, a print carrier forming the upper layer, and a rubber coating which acts as the printing transfer medium. The print carrier rests loosely on the filler support and can be clamped together in place with the filler support. (GB-PS 1426294).
Dividing the press blanket into a thin printing-transfer layer and a filling lower layer achieves a savings in material. This is because if there is damage to the upper surface, it is only necessary to replace the thin upper layer.
This known two-layered press blanket has an additional advantage that the active printing transfer layer is not destroyed by distortions, e.g., by crumpling or creasing. Rather, the rapid elastic recovery of the two-layered press blanket permits the printing procedure to continue, thereby reducing the necessity of replacing the printing layer. This regenerative effect is based, among other things, on the fact that the filler support which consists of a cloth carrier or foil carrier and a rubber mixture disposed thereon has a thickness of from 1.4 to 2.8 mm whilst the printing carrier, which is a rubber-coated, tear-resistant sheet has a thickness of 0.1 to 0.3 mm.
The known two-layer press blanket is particularly suitable for offset sheet-fed presses.
However, it is less suitable for offset-rollerrotary-machines, because the rails in such offset-roller-rotary-machines are generally too weak. Furthermore, in offset-roller-rotary-machines, the danger exists that suction will join the printing carrier and filler layer together, which can lead to doubling or blurring of the printing.
The present invention seeks to provide a printing blanket which is suitable for use in offset cylinder machines and which has a high coefficient of elasticity or a high regenerative coefficient of the printing carrier.
In accordance with the present invention, there is provided a press blanket for offsetroller-rotary-machines, comprising a filler layer formed of a synthetic rubber and a printing carrier comprising a rubber-coated tear-resistant synthetic sheet having a low coefficient of elasticity, at least one side of the sheet being uncoated, the uncoated side being directly secured by vulcanization to the filler layer.
Such a "single-layer" press blanket is strong in construction and can be splinter. It also has a very low tendency to swell, as well as a crease absorbing capacity of up to 1 mm. The rubber coating for the plastics sheet desirably is formed of a nitrile rubber mixture. The coating preferably a thickness of 0.45 to 0.55 mm., advantageously 0.5 mm. This rubber coating reduces the build-up of layers of dye and paper dust, thus avoiding extended washing intervals such that it leads to greater economic profitability.
In one embodiment of the press blanket, the thickness of the filler layer comprises 30.50%, the thickness of the tear-resistant and low-expansion plastic sheet comprises 7.5 to 15%, and the thickness of the rubber coating on the plastic sheet comprises 20 to 30% each percentage being of the total thickness of the press blanket. The tear-resistant and low-expansion plastic sheet is preferably made of a polyester and the polyester is desirably polyethylene terephthalate. Desirably, the sheet has a thickness of between 0.2 and 0.3 mm., such thickness preferably being 0.25 mm. The filler layer advantageously has a thickness of between 1.10 and 1.30 mm., the preferred thickness being 1.20 mm. Such proportioning of the individual thicknesses may result in a total thickness of 1.95 mm., which is the required thickness for offsetroller-rotary-machines.The bonding of the filler layer to the tear-resistant plastic sheet is achieved by vulcanization, the polyester or polyethylene-terephthalate sheet being, desirably pre-treated with an adhesive agent.
The invention will be further described with reference to the accompanying drawing, the single Figure of which shows a schematic cross-sectional view of one embodiment of the present invention.
In the Figure, there is shown a portion of a press blanket formed of a tear-resistant plastics sheet 1 made of a polyester such as polyethylene teraphthalate. The sheet has a thickness of 0.25 mm. The sheet 1 is provided, on its upper surface, with a rubber coating 3 which acts as an active print-transferring layer. The coating 3 is formed of a nitrile rubber mixture having a thickness of 0.5 mm. The underside of plastic sheet 1 is vulcanized onto a filler layer 2 made of synthetic rubber and which is, in practice, applied to a sheet carrier such as cloth carrier 4. The thickness of filler layer 2, including the cloth or sheet carrier 4 is 1.20 mm.
1. A press blanket for offset-roller-rotarymachines, comprising a filler layer formed of a synthetic rubber and a printing carrier comprising a rubber-coated, tear-resistant synthetic sheet having a low ciefficient of elasticity, at least one side of the sheet being uncoated, the uncoated side being directly secured by vulcanization to the filler layer.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (11)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Press blanket for offset printing machines The present invention relates to a printing blanket for offset printing machines, particularly offset-roller-rotary-machines. The blanket comprises a filler layer of synthetic rubber and a printing carrier which includes a rubbercoated tear-resistant plastics material sheet or foil having a low coefficient of elasticity. Two-layer printing blankets are known for use in offset sheet-fed presses. These press blankets include a filler support forming a lower layer, a print carrier forming the upper layer, and a rubber coating which acts as the printing transfer medium. The print carrier rests loosely on the filler support and can be clamped together in place with the filler support. (GB-PS 1426294). Dividing the press blanket into a thin printing-transfer layer and a filling lower layer achieves a savings in material. This is because if there is damage to the upper surface, it is only necessary to replace the thin upper layer. This known two-layered press blanket has an additional advantage that the active printing transfer layer is not destroyed by distortions, e.g., by crumpling or creasing. Rather, the rapid elastic recovery of the two-layered press blanket permits the printing procedure to continue, thereby reducing the necessity of replacing the printing layer. This regenerative effect is based, among other things, on the fact that the filler support which consists of a cloth carrier or foil carrier and a rubber mixture disposed thereon has a thickness of from 1.4 to 2.8 mm whilst the printing carrier, which is a rubber-coated, tear-resistant sheet has a thickness of 0.1 to 0.3 mm. The known two-layer press blanket is particularly suitable for offset sheet-fed presses. However, it is less suitable for offset-rollerrotary-machines, because the rails in such offset-roller-rotary-machines are generally too weak. Furthermore, in offset-roller-rotary-machines, the danger exists that suction will join the printing carrier and filler layer together, which can lead to doubling or blurring of the printing. The present invention seeks to provide a printing blanket which is suitable for use in offset cylinder machines and which has a high coefficient of elasticity or a high regenerative coefficient of the printing carrier. In accordance with the present invention, there is provided a press blanket for offsetroller-rotary-machines, comprising a filler layer formed of a synthetic rubber and a printing carrier comprising a rubber-coated tear-resistant synthetic sheet having a low coefficient of elasticity, at least one side of the sheet being uncoated, the uncoated side being directly secured by vulcanization to the filler layer. Such a "single-layer" press blanket is strong in construction and can be splinter. It also has a very low tendency to swell, as well as a crease absorbing capacity of up to 1 mm. The rubber coating for the plastics sheet desirably is formed of a nitrile rubber mixture. The coating preferably a thickness of 0.45 to 0.55 mm., advantageously 0.5 mm. This rubber coating reduces the build-up of layers of dye and paper dust, thus avoiding extended washing intervals such that it leads to greater economic profitability. In one embodiment of the press blanket, the thickness of the filler layer comprises 30.50%, the thickness of the tear-resistant and low-expansion plastic sheet comprises 7.5 to 15%, and the thickness of the rubber coating on the plastic sheet comprises 20 to 30% each percentage being of the total thickness of the press blanket. The tear-resistant and low-expansion plastic sheet is preferably made of a polyester and the polyester is desirably polyethylene terephthalate. Desirably, the sheet has a thickness of between 0.2 and 0.3 mm., such thickness preferably being 0.25 mm. The filler layer advantageously has a thickness of between 1.10 and 1.30 mm., the preferred thickness being 1.20 mm. Such proportioning of the individual thicknesses may result in a total thickness of 1.95 mm., which is the required thickness for offsetroller-rotary-machines.The bonding of the filler layer to the tear-resistant plastic sheet is achieved by vulcanization, the polyester or polyethylene-terephthalate sheet being, desirably pre-treated with an adhesive agent. The invention will be further described with reference to the accompanying drawing, the single Figure of which shows a schematic cross-sectional view of one embodiment of the present invention. In the Figure, there is shown a portion of a press blanket formed of a tear-resistant plastics sheet 1 made of a polyester such as polyethylene teraphthalate. The sheet has a thickness of 0.25 mm. The sheet 1 is provided, on its upper surface, with a rubber coating 3 which acts as an active print-transferring layer. The coating 3 is formed of a nitrile rubber mixture having a thickness of 0.5 mm. The underside of plastic sheet 1 is vulcanized onto a filler layer 2 made of synthetic rubber and which is, in practice, applied to a sheet carrier such as cloth carrier 4. The thickness of filler layer 2, including the cloth or sheet carrier 4 is 1.20 mm. CLAIMS
1. A press blanket for offset-roller-rotarymachines, comprising a filler layer formed of a synthetic rubber and a printing carrier comprising a rubber-coated, tear-resistant synthetic sheet having a low ciefficient of elasticity, at least one side of the sheet being uncoated, the uncoated side being directly secured by vulcanization to the filler layer.
2. A press blanket as claimed in Claim 1, wherein the thickness of the filler layer comprises substantially 30 to 50% of the total thickness of the press blanket, the thickness of the tear-resistant synthetic sheet comprises substantially 7.5 to 15% of the total thickness of the press blanket and the thickness of the rubber coating on the synthetic sheet comprises substantially 20 to 30% of the total thickness of the press blanket.
3. A press blanket as claimed in Claim 1 or 2 wherein the synthetic sheet is formed of a polyester.
4. A press blanket as claimed in Claim 3 wherein the synthetic sheet is formed of polyethylene terephthalate.
5. A press blanket as claimed in Claim 4 wherein the sheet has a thickness of between 0.2 and 0.3 mm.
6. A press blanket as claimed in Claim 5 wherein the sheet has a thickness of 0.25 mm.
7. A press blanket as claimed in any preceding claim wherein the rubber coating for the synthetic sheet which acts as an active print-transfer layer is formed of a nitrile rubber mixture.
8. A press blanket as claimed in Claim 7 wherein the thickness of the rubber coating is substantially 0.45 to 0.55 mm.
9. A press blanket as claimed in any preceding claim wherein the filler layer has a thickness of 1.10 to 1.30 mm.
10. A press blanket as claimed in claim 9 wherein the filler layer has a thickness of 1.20 mm.
11. A press blanket as claimed in any preceding claim wherein the filler layer is applied to a sheet carrier.
1 2. A press blanket as claimed in claim 1 constructed and arranged to operate substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
GB8033208A 1979-10-25 1980-10-15 Press blanket for offset printing machines Withdrawn GB2065549A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19797930185U DE7930185U1 (en) 1979-10-25 1979-10-25 PRINTED SCARF FOR OFFSET PRINTING MACHINES

Publications (1)

Publication Number Publication Date
GB2065549A true GB2065549A (en) 1981-07-01

Family

ID=6708529

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8033208A Withdrawn GB2065549A (en) 1979-10-25 1980-10-15 Press blanket for offset printing machines

Country Status (5)

Country Link
JP (1) JPS5667295A (en)
DE (1) DE7930185U1 (en)
FR (1) FR2467707A1 (en)
GB (1) GB2065549A (en)
IT (1) IT1133168B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1645433A1 (en) * 2004-10-06 2006-04-12 MAN Roland Druckmaschinen AG Sleeve of a cylinder in a printing machine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6137976U (en) * 1984-08-11 1986-03-10 住友ゴム工業株式会社 Blankets for printing machines
DE3522040A1 (en) * 1985-06-20 1987-01-02 Feldmuehle Ag Blanket for offset printing machines and use
CA2068629C (en) * 1991-05-14 1996-05-07 James B. Vrotacoe Gapless tubular printing blanket

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1645433A1 (en) * 2004-10-06 2006-04-12 MAN Roland Druckmaschinen AG Sleeve of a cylinder in a printing machine

Also Published As

Publication number Publication date
IT1133168B (en) 1986-07-09
JPS5667295A (en) 1981-06-06
IT8025132A0 (en) 1980-10-06
FR2467707A1 (en) 1981-04-30
DE7930185U1 (en) 1980-07-03

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)