EP1171304A1 - Improved gravure printing rollers - Google Patents

Improved gravure printing rollers

Info

Publication number
EP1171304A1
EP1171304A1 EP00917187A EP00917187A EP1171304A1 EP 1171304 A1 EP1171304 A1 EP 1171304A1 EP 00917187 A EP00917187 A EP 00917187A EP 00917187 A EP00917187 A EP 00917187A EP 1171304 A1 EP1171304 A1 EP 1171304A1
Authority
EP
European Patent Office
Prior art keywords
gravure roller
shell
porous
conductive
roller according
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
EP00917187A
Other languages
German (de)
French (fr)
Other versions
EP1171304B1 (en
Inventor
Robert Malcolm Moss
John William Campion
Sidney Robert Armfield
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.)
Hyperlast Ltd
Original Assignee
Libra Gravure Cylinders (Plastics Division) Ltd
LIBRA GRAVURE CYLINDERS Ltd
Hyperlast Ltd
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
Priority claimed from GBGB9907784.4A external-priority patent/GB9907784D0/en
Priority claimed from GBGB9913643.4A external-priority patent/GB9913643D0/en
Application filed by Libra Gravure Cylinders (Plastics Division) Ltd, LIBRA GRAVURE CYLINDERS Ltd, Hyperlast Ltd filed Critical Libra Gravure Cylinders (Plastics Division) Ltd
Publication of EP1171304A1 publication Critical patent/EP1171304A1/en
Application granted granted Critical
Publication of EP1171304B1 publication Critical patent/EP1171304B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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)
  • Electroplating Methods And Accessories (AREA)
  • Polyurethanes Or Polyureas (AREA)
  • Confectionery (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Impression-Transfer Materials And Handling Thereof (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Holo Graphy (AREA)

Abstract

A gravure printing roller comprises a body or shell (15) moulded from syntactic compositions comprising microbeads of a plastic, glass or ceramic material in an e.g. polyurethane matrix. The shell (15) is machined to the required size and then a copper coating (17) is deposited on the machined surface, and chrome treated. An electrically conductive coating is first deposited on the machined surface which coating comprises a conductive agent such as finely divided metal.

Description

IMPROVED GRAVURE PRINTING ROLLERS
This invention relates to improvements in gravure printing rollers.
At present, gravure printing rollers are usually machined to the required size from stainless steel. Stainless steel rollers are however
extremely heavy which is a major disadvantage, both from the point of view
of transportation, and also in changing rollers in a printing machine.
Accordingly, it has been long considered desirable to be able to use
rollers of a lower weight material, such as a composite including a relatively
low density synthetic material which retains a durable printing face such as
chrome treated copper, yet is light to ease shipping and handling.
It has been found that standard foam material is unsuitable for this
purpose as the moulded foam core requires sealing with a filler to close the
pores to enable a pore and void-free copper coating to be deposited and
subsequently chrome treated as a print face. Even if a skinning foam is
used to produce a roller shell, the great diversity of gravure roller dimeters
requires that a machining operation is used to reduce the roller shell
diameter to the designed value, which exposes foam pores which require
filling.
Further, the equipment required to produce a foam core is
complicated because it is necessary to use clamping force to hold in the
foam during the moulding cycle.
According to the broadest aspect of the invention 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
from a syntactic moulding composition, having a non-porous machined
surface with a printing face of chrome treated copper deposited on the non-porous surface.
A syntactic moulding composition is defined for the purpose of this
specification as being a synthetic matrix including preformed beads
providing discrete bubbles. This composition is capable of providing a
uniform cellular construction of homogenous and consistent density which
can be machined without leaving a porous or void containing surface.
The syntactic moulding composition preferably comprises a
polyurethane composition formed into preformed plastics beads each
comprising an individual shell surrounding an interior void and bonded by a
polyurethane composition. The beads may be in the size range of 20 to
100 microns (weight average diameter) and may alternatively comprise
other polymers, glass, or ceramic beads.
The invention also includes a method of manufacturing a gravure
roller, comprising moulding a roller shell from a syntactic moulding
composition.
The shell may then be machined to provide a non-porous void-free
surface of the required dimensions, a printing face of copper deposited
thereon, and the copper surface subsequently chrome treated. The shell may advantageously be mechanically reinforced, to prevent
flexure of the roller, by means of a rigid tubular core upon which the shell
is moulded. The core may be for example of glass reinforced plastics, or a
concrete composition.
The polyurethane used in the moulding composition can be
manufactured from a range of ingredients. For example, polyether or
polyester polyols may be used, with any of the common isocyanates;
including methylene diphenyl diisocyanate; toluene diisocyanate;
naphthalene diisocyanate; tetramethyl xylidene diisocyanate; isophorone
diisocyanate; phenylene diisocyanate; cyclohexyl diisocyanate; xylidene
diisocyanate; hexamethylene diisocyanate; as well as biuret, allophanate
and prepolymeric adducts of these. Diol, triol, polyoi or polyamine
crosslinkers may be used, with an amine or metal catalyst which is
preferably of a type which negates blowing reaction in the moulding step
following bead expansion.
The isocyanate component may be pre-polymerised and contain the
expansion agent so that the isocyanate component is a low density liquid
whilst the polyoi is a standard polyoi.
A suitable composition may be as follow:-
Polyoi component:- (by weight )
Caster Oil - 46.8
Polyether hexol - 46.8 Antifoam - 0.19
Dessicant - 2.4
Catalysts - 0.25
Expancel 551 DE - 3.59
Isocyanate:-
Polymeric methylene diphenyl diisocyanate (MDI) - 100%
Mix ratio: 60 parts polyoi to 50 parts of isocyanate
Gel time at 25°C - 10 to 15 minutes
Hardness - 70 shore D
Density - 0.72
Viscosity polyoi - 400 poise at 25 °C
The moulding is carried out at 60°C in a low pressure two component
polyurethane dispenser-2KM machine.
In accordance with this invention, the surface of the syntactic moulding
polyurethane composition is, after machining, preferably treated with a
conductive coating to provide a host surface for the copper plating.
This has been found to be necessary as the preferred syntactic
polyurethane composition keys poorly to the cooper plating so that there is
low adhesion between the machined roller surface and the cooper layer.
The conductive coating is preferably an organic solvent based
composition containing one or more conductive agents. The latter may
comprise additions of 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
composition ,whilst in other possible embodiments, the roller shells are
fitted with steel or aluminum end plates and/or shafts or trunnions.
The rollers according to the invention may be used not only for
gravure printing, but also for flexo printing.
The invention will now be further described by way of
example, with reference to the accompanying drawings, wherein:-
Figure 1 is a simplified cross-sectional view of a gravure roller
according to the invention;
Figure 2 is an enlarged sectional view of part of the roller shell;
Figure 3 is a much enlarged sectional view showing the results
obtained by working a conventional urethane foam; and
Figure 4 is a similar enlarged sectional view of the structure of a
surface produced by working a syntactic foam on a roller
according to the invention.
In Figurel , a gravure roller 1 is shown which comprises a roller body
or shell 15. In accordance with the invention the roller shell body 15 is
made by moulding a syntactic polyurethane foam, which is then machined
to achieve the desired diameter and produce a substantially non-porous and
void-free outer surface 16, on which a layer of copper 17 is deposited after
treatment with a conductive coating which provides adhesion for the copper, and then treated with chrome and processed as required to act as
a gravure printing roller. The roller also includes a tubular core 12, which
acts as a support and reinforcing member to prevent or minimise flexure of
the roller, with end caps 13, 14 formed with trunnions 1 1 so that the roller
1 can be mounted in a machine. The core is of a suitably strong material,
such as 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.
A portion of the roller shell 15 with the copper layer 17 thereon is
shown in Figure 2.
Figure 4 shows, much magnified, the surface 16 of the roller shell 15,
wherein the bonded beads or bubbles 18 of polyurethane or other plastics
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
by the opening or removal of individual beads 18. The beads may
alternatively be of glass or ceramic material.
By contrast, Figure 3 shows a machined surface 1 16 of a layer 1 15
of a normal open-celled foam which has, for example, been poured into the
mould as liquid and allowed to cure and foam simultaneously in the mould.
As shown, the foam, after planarising , has major voids 1 17 and pores 1 18
which, by linking of adjacent foam cell, often penetrate well in to the foam body so that the surface 1 16 is by no means non-porous or free voids.
The roller shell 15 is made by moulding a syntactic polyurethane
foam. This is then machined to the required size, a coat of a special paint
applied over the surface, copper deposited and the shell is then assembled
into the roller structure for subsequent chromium plating, etching and use
in printing.
The roller may weigh about 5 to 7 kg instead of the weight of 100 kg
when steel is used for the roller shell.
The roller can be refurbished by recoating with copper and re-
chromium plating and etching. The relatively light weight ensures that
transportation and handling, including mounting and dismounting the roller
is easy and imposes no handling problems. A roller formerly requiring use
of a 7.5 tonne truck for delivery of a set of rollers can now be delivered
using a light weight van.
Because of the reduced weight of the shell, the other parts of the
roller, including the end plates, shaft and trunnions, can be made of reduced
weight materials, e. g. lightweight metals such as aluminium alloys, or
synthetic materials such as suitable rigid plastic materials including forming
all or part of the roller from the syntactic foam material.
A preferred syntactic foam composition used in manufacture of the
shell is preferably as set out above.
Alternatively, 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.
Other urethane derivatives can be polyoxazolidone produced by
means of epoxy/isocyanate addition compositions.
As an alternative to polyurethane, the syntactic material can be based
on other polymers such as unsaturated polyesters, vinyl esters or
polyacrylic systems such as Modar (Trade Mark of ICI) can be used.

Claims

Claims
1. A gravure roller comprising a lightweight shell made from a
syntactic moulding composition.
2. A gravure roller according to claim 1 , further comprising a non-
porous machined surface with a printing face of chrome treated copper
deposited on the non-porous surface.
3. A gravure roller according to claim 2 further comprising a
conductive coating provided on the non-porous machined surface.
4. A gravure roller according to any proceeding claim, wherein the
syntactic moulding composition comprises a matrix including preformed
beads providing discrete bubbles.
5. A gravure roller according to claim 4, wherein said beads each
comprise a polyurethane or other plastics composition or glass, or ceramic
shell surrounding an interior void.
6. A gravure roller according to claim 3, wherein the conductive
coating comprises an organic solvent based composition containing one or
more conductive agents.
7. A gravure roller according to claim 6 wherein the conductive
agent or agents comprises an additive or one or more conductive finely
divided metals.
8. A gravure roller according to claim 6, wherein the conductive
agent comprises an additive which adjusts the ionic state of the coating to render it conductive.
9. A gravure roller according to claim 4 wherein the beads have a size range of from 20 to 100 microns.
10. A gravure roller according to any proceeding claim wherein the
shell is formed on a reinforcing core.
1 1 . A method of manufacturing a gravure roller, comprising
moulding a roller shell from a syntactic moulding composition .
12. A method according to claim 1 1 , comprising machining the
peripheral surface of said roller shell to produce a non-porous machined
surface.
13. A method according to claim 12, comprising coating the non-
porous machined surface with a conductive coating.
14. A method according to claim 12 or 13 comprising depositing
a layer of chrome treated copper on the non-porous machined surface to
provide a printing face.
EP00917187A 1999-04-07 2000-04-06 Improved gravure printing rollers Expired - Lifetime EP1171304B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GBGB9907784.4A GB9907784D0 (en) 1999-04-07 1999-04-07 Improved gravure printing rollers
GB9907784 1999-04-07
GBGB9913643.4A GB9913643D0 (en) 1999-06-11 1999-06-11 Improved gravure printing rollers
GB9913643 1999-06-11
PCT/GB2000/001301 WO2000059727A1 (en) 1999-04-07 2000-04-06 Improved gravure printing rollers

Publications (2)

Publication Number Publication Date
EP1171304A1 true EP1171304A1 (en) 2002-01-16
EP1171304B1 EP1171304B1 (en) 2003-09-10

Family

ID=26315383

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00917187A Expired - Lifetime EP1171304B1 (en) 1999-04-07 2000-04-06 Improved gravure printing rollers

Country Status (9)

Country Link
EP (1) EP1171304B1 (en)
JP (1) JP4179752B2 (en)
AT (1) ATE249339T1 (en)
AU (1) AU3828100A (en)
DE (1) DE60005167T2 (en)
DK (1) DK1171304T3 (en)
ES (1) ES2207495T3 (en)
PT (1) PT1171304E (en)
WO (1) WO2000059727A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011038496A1 (en) * 2009-09-30 2011-04-07 Garry Machine Mfg. Inc. Process for refurbishing cylinder rolls and bases for printing machines

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0128469D0 (en) 2001-11-28 2002-01-16 Keating Gravure Systems Uk Ltd Printing cylinder manufacture
GB2417711B (en) * 2003-05-02 2007-04-11 Hyperlast Ltd Manufacture of gravure printing rollers
WO2007068262A1 (en) * 2005-12-12 2007-06-21 Peter Weber Method for manufacturing and/or recycling of cores for gravure printing cylinders, cores and device for manufacturing the cores

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0038385A1 (en) * 1980-04-14 1981-10-28 Karl D. Bardin Metal plated plastic base intaglio printing cylinders and plates, process and apparatus
EP0347456B1 (en) * 1987-10-05 1993-10-20 Kinyosha Co. Ltd. Ink roller for printing press and production thereof
JPH082643B2 (en) * 1988-09-30 1996-01-17 株式会社東京機械製作所 Printing machine inking roller and method for manufacturing printing machine inking roller
IT1228855B (en) * 1989-02-23 1991-07-05 Rossini Erminio Spa PROCEDURE FOR OBTAINING PLASTIC CYLINDERS FOR GENERAL PRINTING, IN PARTICULAR ROTOCALCO AND FLEXOGRAPHY, AND CYLINDER SO OBTAINED.
US6224526B1 (en) * 1997-12-19 2001-05-01 H.B. Fuller Licensing & Financing, Inc. Printing rollers

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0059727A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011038496A1 (en) * 2009-09-30 2011-04-07 Garry Machine Mfg. Inc. Process for refurbishing cylinder rolls and bases for printing machines
US8443516B2 (en) 2009-09-30 2013-05-21 Garry Machine Mfg. Inc. Process for refurbishing cylinder rolls and bases for printing machines

Also Published As

Publication number Publication date
DK1171304T3 (en) 2003-12-29
ATE249339T1 (en) 2003-09-15
EP1171304B1 (en) 2003-09-10
JP2002540985A (en) 2002-12-03
PT1171304E (en) 2004-01-30
JP4179752B2 (en) 2008-11-12
ES2207495T3 (en) 2004-06-01
DE60005167D1 (en) 2003-10-16
WO2000059727A1 (en) 2000-10-12
DE60005167T2 (en) 2004-06-17
AU3828100A (en) 2000-10-23

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