GB2057094A - Printing cylinder or roller - Google Patents

Printing cylinder or roller Download PDF

Info

Publication number
GB2057094A
GB2057094A GB8027189A GB8027189A GB2057094A GB 2057094 A GB2057094 A GB 2057094A GB 8027189 A GB8027189 A GB 8027189A GB 8027189 A GB8027189 A GB 8027189A GB 2057094 A GB2057094 A GB 2057094A
Authority
GB
United Kingdom
Prior art keywords
microns
layer
printing machine
cylinders
surface 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.)
Granted
Application number
GB8027189A
Other versions
GB2057094B (en
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.)
Polygraph Leipzig Kombinat Veb
Original Assignee
Polygraph Leipzig Kombinat Veb
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 Polygraph Leipzig Kombinat Veb filed Critical Polygraph Leipzig Kombinat Veb
Publication of GB2057094A publication Critical patent/GB2057094A/en
Application granted granted Critical
Publication of GB2057094B publication Critical patent/GB2057094B/en
Expired 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
    • B41N7/00—Shells for rollers of printing machines
    • B41N7/06—Shells for rollers of printing machines for inking rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • 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
    • B41N2207/00—Location or type of the layers in shells for rollers of printing machines
    • B41N2207/02—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
    • B41N2207/00—Location or type of the layers in shells for rollers of printing machines
    • B41N2207/10—Location or type of the layers in shells for rollers of printing machines characterised by inorganic compounds, e.g. pigments

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Powder Metallurgy (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

A cylinder or roller of a printing machine is provided with a surface layer applied by coating it with a powder of at least one of a metal, a metal oxide and a metal carbide in a substantially homogeneous thin layer with a layer thickness of less than 50 microns, while using powder grain sizes of less than 25 microns, for the purposes of corrosion protection and reduction of any tendency to the smearing-off of ink. When metal powder is used this may be chrome, nickel or cobalt. The powder coating may be in one or more layers and micropores may be closed by sealers.

Description

SPECIFICATION A printing machine The present invention relates to a printing machine comprising at least one cylinder or roller which is provided with a surface layer for protection against corrosion and for reduction of any tendency to the smearing-off of ink.
Printing machines are known, which for avoidance of the smearing-off are equipped with cylinders provided with a chrome layer having a thickness of 7 to 1 2 microns and a surface roughness of 2 to 7.5 microns. This chrome layer is porous and offers no adequate protection against corrosion of the cylinders coming into contact with water and chemicals.
Cylinders are also known, which have a surface layer of metals, metal oxides and/or metal carbides in a thickness of 0.25 microns consisting of an intermediate layer of 0.2 millimetres of a thin covering layer of 0.05 to 0.06 millimetres. This surface layer affords adequate protection against corrosion and prevents the smearing-off. The layer, which is applied in several operating steps and not homogeneous, however causes local deviations from the basic intended geometric shape of the cylinder. The demands made on the high accuracy of cylinders of printing machines are thereby no longer fulfilled, which leads to a reduction in quality of the prints produced on the printing machine; alternatively, further operating steps, such as for example grinding, are required for the restoration of the geometry of the cylinders.Beyond that, this surface layer requires a high material expenditure.
It is therefore desirable for cylinders and rollers of a printing machine to be provided with a surface layer, which is applied by means of powder coating for protection against corrosion and for the reduction of any tendency to the smearing-off of ink and which displays a low thickness tolerance so as to produce substantially no change in the geometry of the cylinder and the roller.
According to the present invention, there is now provided a printing machine comprising at least one cylinder or roller which is provided with a surface layer applied thereto by coating with a powder having grain sizes not exceeding 25 microns and being in layer thickness not exceeding 50 microns.
In an example of embodiment of the present invention, such a surface layer comprises metals, such as for example chrome, nickel and cobalt, metal oxides and/or metal carbides, for cylinders .and rollers and is produced by means of powder coating with the use of powders of at least one of the named materials with a grain size not exceeding 25 microns. The powder coating of rollers and cylinders can be performed by any suitable known method to a thickness not exceeding 50 microns in one or more layers; possibly present micropores may be closed by means of sealers.
The porosity of the surface layer is substantially reduced and a high degree of homogeneity is attained when processing powders with a grain size not exceeding 25 microns so that even thin layers in conscious departure from generally accepted opinion afford adequate corrosion protection with simultaneous reduction in any tendency to the smearing-off of ink.
By the thin layer technique, it is possible to produce layer thickness with smallest thickness tolerance below 5 microns and thereby to fulfil the accuracy demands which have been set on the surface geometry of cylinders and rollers of printing machines.
Through the application of the think layer technique, a better material economy may be attained and the work effort for the production of the surface layer may be lowered at the same time.
1. A printing machine comprising at least one cylinder or roller which is provided with a surface layer applied thereto by coating with a powder having grain sizes not exceeding 25 microns and being in a layer thickness not exceeding 50 microns.
2. A printing machine as claimed in claim 1, wherein the powder comprises at least one metallic material.
3. A printing machine as claimed in claim 1, wherein the powder comprises at least one metal oxide.
4. A printing machine as claimed in claim 1, wherein the powder comprises at least one metal carbide.
5. A printing machine substantially as hereinbefore described and constructed and arranged for the purpose hereinbefore set forth.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A printing machine The present invention relates to a printing machine comprising at least one cylinder or roller which is provided with a surface layer for protection against corrosion and for reduction of any tendency to the smearing-off of ink. Printing machines are known, which for avoidance of the smearing-off are equipped with cylinders provided with a chrome layer having a thickness of 7 to 1 2 microns and a surface roughness of 2 to 7.5 microns. This chrome layer is porous and offers no adequate protection against corrosion of the cylinders coming into contact with water and chemicals. Cylinders are also known, which have a surface layer of metals, metal oxides and/or metal carbides in a thickness of 0.25 microns consisting of an intermediate layer of 0.2 millimetres of a thin covering layer of 0.05 to 0.06 millimetres. This surface layer affords adequate protection against corrosion and prevents the smearing-off. The layer, which is applied in several operating steps and not homogeneous, however causes local deviations from the basic intended geometric shape of the cylinder. The demands made on the high accuracy of cylinders of printing machines are thereby no longer fulfilled, which leads to a reduction in quality of the prints produced on the printing machine; alternatively, further operating steps, such as for example grinding, are required for the restoration of the geometry of the cylinders.Beyond that, this surface layer requires a high material expenditure. It is therefore desirable for cylinders and rollers of a printing machine to be provided with a surface layer, which is applied by means of powder coating for protection against corrosion and for the reduction of any tendency to the smearing-off of ink and which displays a low thickness tolerance so as to produce substantially no change in the geometry of the cylinder and the roller. According to the present invention, there is now provided a printing machine comprising at least one cylinder or roller which is provided with a surface layer applied thereto by coating with a powder having grain sizes not exceeding 25 microns and being in layer thickness not exceeding 50 microns. In an example of embodiment of the present invention, such a surface layer comprises metals, such as for example chrome, nickel and cobalt, metal oxides and/or metal carbides, for cylinders .and rollers and is produced by means of powder coating with the use of powders of at least one of the named materials with a grain size not exceeding 25 microns. The powder coating of rollers and cylinders can be performed by any suitable known method to a thickness not exceeding 50 microns in one or more layers; possibly present micropores may be closed by means of sealers. The porosity of the surface layer is substantially reduced and a high degree of homogeneity is attained when processing powders with a grain size not exceeding 25 microns so that even thin layers in conscious departure from generally accepted opinion afford adequate corrosion protection with simultaneous reduction in any tendency to the smearing-off of ink. By the thin layer technique, it is possible to produce layer thickness with smallest thickness tolerance below 5 microns and thereby to fulfil the accuracy demands which have been set on the surface geometry of cylinders and rollers of printing machines. Through the application of the think layer technique, a better material economy may be attained and the work effort for the production of the surface layer may be lowered at the same time. CLAIMS
1. A printing machine comprising at least one cylinder or roller which is provided with a surface layer applied thereto by coating with a powder having grain sizes not exceeding 25 microns and being in a layer thickness not exceeding 50 microns.
2. A printing machine as claimed in claim 1, wherein the powder comprises at least one metallic material.
3. A printing machine as claimed in claim 1, wherein the powder comprises at least one metal oxide.
4. A printing machine as claimed in claim 1, wherein the powder comprises at least one metal carbide.
5. A printing machine substantially as hereinbefore described and constructed and arranged for the purpose hereinbefore set forth.
GB8027189A 1979-08-29 1980-08-21 Printing cylinder or roller Expired GB2057094B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DD21524779 1979-08-29

Publications (2)

Publication Number Publication Date
GB2057094A true GB2057094A (en) 1981-03-25
GB2057094B GB2057094B (en) 1983-03-02

Family

ID=5519877

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8027189A Expired GB2057094B (en) 1979-08-29 1980-08-21 Printing cylinder or roller

Country Status (2)

Country Link
DE (1) DE3024740A1 (en)
GB (1) GB2057094B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2169381A (en) * 1985-01-09 1986-07-09 Valmet Oy Synthetic press role for paper machine
GB2180624A (en) * 1985-09-16 1987-04-01 Valmet Oy Press roll and method for the manufacture of same
EP0396114A2 (en) * 1989-05-02 1990-11-07 Praxair S.T. Technology, Inc. Liquid transfer articles and method for producing them
EP0400621A2 (en) * 1989-05-31 1990-12-05 Praxair S.T. Technology, Inc. Method for producing liquid transfer articles
EP0687575A1 (en) * 1994-06-17 1995-12-20 Alcan Deutschland Gmbh Coating or inking roller
EP0999043A1 (en) * 1998-11-05 2000-05-10 MAN Roland Druckmaschinen AG Wear retardant and ink repellent coating, especially for parts of printing machines

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2169381A (en) * 1985-01-09 1986-07-09 Valmet Oy Synthetic press role for paper machine
GB2180624A (en) * 1985-09-16 1987-04-01 Valmet Oy Press roll and method for the manufacture of same
GB2180624B (en) * 1985-09-16 1989-09-20 Valmet Oy Press roll and method for its manufacture
EP0396114A2 (en) * 1989-05-02 1990-11-07 Praxair S.T. Technology, Inc. Liquid transfer articles and method for producing them
EP0396114A3 (en) * 1989-05-02 1991-04-03 Praxair S.T. Technology, Inc. Liquid transfer articles and method for producing them
EP0400621A2 (en) * 1989-05-31 1990-12-05 Praxair S.T. Technology, Inc. Method for producing liquid transfer articles
EP0400621A3 (en) * 1989-05-31 1991-04-10 Praxair S.T. Technology, Inc. Method for producing liquid transfer articles
EP0687575A1 (en) * 1994-06-17 1995-12-20 Alcan Deutschland Gmbh Coating or inking roller
EP0999043A1 (en) * 1998-11-05 2000-05-10 MAN Roland Druckmaschinen AG Wear retardant and ink repellent coating, especially for parts of printing machines
US6514623B2 (en) 1998-11-05 2003-02-04 Man Roland Druckmaschinen Ag Wear-resisting, ink-repellent coating process for printing-press components

Also Published As

Publication number Publication date
DE3024740A1 (en) 1981-03-19
GB2057094B (en) 1983-03-02

Similar Documents

Publication Publication Date Title
US3965786A (en) Rotary die cutter
DE69002975T2 (en) Engraved micro-ceramic coated cylinder and coating process therefor.
EP0634293B1 (en) Process and apparatus for the repair of printing machine cylinders
SE463466B (en) PRESS ROLL FOR USE IN A PAPER MACHINE AND PROCEDURE FOR MANUFACTURE OF SUCH A PRESS ROLL
US2299192A (en) Method of making sintered articles
US2908068A (en) Inking roller with porous corrosion resistant coating
GB2057094A (en) Printing cylinder or roller
DE3886206T2 (en) INK CYLINDERS FOR A PRINT PRESS AND METHOD FOR THE PRODUCTION THEREOF.
DE2914255A1 (en) SINGLE OR MULTI-LAYER COAT FOR CURVED CYLINDERS
GB2122925A (en) Roll
US4069570A (en) Cylinders and rollers for printing machines
US4986181A (en) Rollers for a lithographic ink supplying system
US2076952A (en) Production of hard metal alloys
IE61175B1 (en) A method of duplicating steel intaglio print elements, and apparatus for implementing the method
KR970704532A (en) WEAR-PROTECTION LAYER FOR CASTING ROLLERS FOR CASTING ROLLERS
CN107351518A (en) A kind of high-strength light gravure printing roller and its processing method
CN102358076A (en) Intaglio printing device and manufacturing method thereof
DE3210495A1 (en) Method of producing bearing surfaces
US2240486A (en) Composition for use in printing
CN207592944U (en) The universal type scraping knife frame of aluminium welding wire
DE3519134C1 (en) Roller, in particular ink roller or distributor roller, for printing machines and their use
DE2808919C3 (en) Process for finishing sliding surfaces on mechanical seal rings
US3124838A (en) Metal coated particles
DE3821658A1 (en) Process for producing corrosion-resistant and wear-resistant layers on printing press cylinders
DE4036252C1 (en)

Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee