Classifications

• • 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
  • B41F13/10—Forme cylinders
  • B41F13/11—Gravure 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
  • B41N1/00—Printing plates or foils; Materials therefor
  • B41N1/16—Curved printing plates, especially 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
  • B41N1/00—Printing plates or foils; Materials therefor
  • B41N1/16—Curved printing plates, especially cylinders
  • B41N1/20—Curved printing plates, especially cylinders made of metal or similar inorganic compounds, e.g. plasma coated ceramics, carbides
• • 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
  • B41N6/00—Mounting boards; Sleeves Make-ready devices, e.g. underlays, overlays; Attaching by chemical means, e.g. vulcanising

Definitions

• This invention relates to improvements in gravure printing rollers.
• gravure printing rollers are usually machined to the required size from stainless steel.
• Stainless steel rollers are however
• rollers of a lower weight material such as a composite including a relatively
• moulded foam core requires sealing with a filler to close the
• a lightweight shell for a gravure roller is made from a syntactic moulding composition.
• the invention also provides a gravure roller comprising a shell; formed
• a syntactic moulding composition is defined for the purpose of this
• This composition is capable of providing a
• the syntactic moulding composition preferably comprises a
• the beads may be in the size range of 20 to
• the invention also includes a method of manufacturing a gravure
• roller comprising moulding a roller shell from a syntactic moulding
• the shell may then be machined to provide a non-porous void-free
• the shell may advantageously be mechanically reinforced, to prevent
• the core may be for example of glass reinforced plastics, or a
• the polyurethane used in the moulding composition can be any polyurethane used in the moulding composition.
• polyether manufactured from a range of ingredients.
• polyester polyols may be used, with any of the common isocyanates;
• naphthalene diisocyanate tetramethyl xylidene diisocyanate
• crosslinkers may be used, with an amine or metal catalyst which is
• the isocyanate component may be pre-polymerised and contain the
• polyoi is a standard polyoi.
• a suitable composition may be as follow:-
• Polyoi component (by weight )
• the moulding is carried out at 60°C in a low pressure two component
• polyurethane composition is, after machining, preferably treated with a
• polyurethane composition keys poorly to the cooper plating so that there is
• the conductive coating is preferably an organic solvent based
• composition containing one or more conductive agents may be any suitable composition containing one or more conductive agents.
• the latter may be any suitable composition containing one or more conductive agents.
• conductive materials such as finely divided metals, or additives which adjust the ionic state of the coating to render it conductive.
• the rollers may be manufactured entirely from the syntactic moulding
• roller shells are
• rollers according to the invention may be used not only for
• Figure 1 is a simplified cross-sectional view of a gravure roller
• Figure 2 is an enlarged sectional view of part of the roller shell
• Figure 3 is a much enlarged sectional view showing the results
• Figure 4 is a similar enlarged sectional view of the structure of a
• a gravure roller 1 which comprises a roller body
• roller shell body 15 is
• the roller also includes a tubular core 12, which
• the core is of a suitably strong material
• glass reinforced plastics or a concrete composition, particularly a resin bonded concrete.
• the conductive composition is an organic based coating including a
• conductive agent such as powdered metal or ionic adjusting additives.
• FIG 4 shows, much magnified, the surface 16 of the roller shell 15,
• foam are shown in a polyurethane matrix 19 and providing a substantially
• non-porous surface 16 free of major voids and with only micros-pits caused
• the beads may be any suitable beads 18.
• Figure 3 shows a machined surface 1 16 of a layer 1 15
• mould as liquid and allowed to cure and foam simultaneously in the mould.
• the foam after planarising , has major voids 1 17 and pores 1 18
• the roller shell 15 is made by moulding a syntactic polyurethane
• the roller may weigh about 5 to 7 kg instead of the weight of 100 kg
• the roller can be refurbished by recoating with copper and re-
• roller including the end plates, shaft and trunnions, can be made of reduced
• weight materials e. g. lightweight metals such as aluminium alloys, or
• moulding may be carried out with a polyisocyanate composition, using a prepolymer with a polyester or polyether polyoi, a
• friability modifier and an isocyanate catalyst such as DABCO TMR5.
• urethane derivatives can be polyoxazolidone produced by
• the syntactic material can be based on polyurethane
• polyacrylic systems such as Modar (Trade Mark of ICI) can be used.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Rolls And Other Rotary Bodies (AREA)
• Printing Plates And Materials Therefor (AREA)
• Inking, Control Or Cleaning Of Printing Machines (AREA)
• Polyurethanes Or Polyureas (AREA)
• Electroplating Methods And Accessories (AREA)
• Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
• Holo Graphy (AREA)
• Confectionery (AREA)
• Manufacture Or Reproduction Of Printing Formes (AREA)
• Impression-Transfer Materials And Handling Thereof (AREA)

Priority Applications (6)

Applications Claiming Priority (4)

Publications (1)

Family

ID=26315383

Family Applications (1)

Country Status (9)

Cited By (4)

Citations (5)

• 2000
  • 2000-04-06 ES ES00917187T patent/ES2207495T3/es not_active Expired - Lifetime
  • 2000-04-06 PT PT00917187T patent/PT1171304E/pt unknown
  • 2000-04-06 DE DE60005167T patent/DE60005167T2/de not_active Expired - Fee Related
  • 2000-04-06 JP JP2000609265A patent/JP4179752B2/ja not_active Expired - Lifetime
  • 2000-04-06 EP EP00917187A patent/EP1171304B1/en not_active Expired - Lifetime
  • 2000-04-06 AT AT00917187T patent/ATE249339T1/de not_active IP Right Cessation
  • 2000-04-06 DK DK00917187T patent/DK1171304T3/da active
  • 2000-04-06 AU AU38281/00A patent/AU3828100A/en not_active Abandoned
  • 2000-04-06 WO PCT/GB2000/001301 patent/WO2000059727A1/en active IP Right Grant

Patent Citations (5)

Non-Patent Citations (1)

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