EP0009360B1 - Manufacture of printing sleeves - Google Patents
Manufacture of printing sleeves Download PDFInfo
- Publication number
- EP0009360B1 EP0009360B1 EP19790301857 EP79301857A EP0009360B1 EP 0009360 B1 EP0009360 B1 EP 0009360B1 EP 19790301857 EP19790301857 EP 19790301857 EP 79301857 A EP79301857 A EP 79301857A EP 0009360 B1 EP0009360 B1 EP 0009360B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sleeve
- mandrel
- roll
- layer
- plating
- 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.)
- Expired
Links
Images
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
- 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
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/18—Curved printing formes or printing cylinders
- B41C1/182—Sleeves; Endless belts
Description
- This invention relates to printing rolls, and is especially applicable to rolls suitable for accepting photo-originating designs, such as used in the gravure or lithographic printing processes.
- Conventionally, a gravure printing surface is provided by etching the surface of a metal printing roll. The production of the roll and the need to replace or discard it after use makes the process very expensive, and only suitable for relatively long printing runs.
- In EP 0000410 there is disclosed a printing sleeve of tapered internal surface and parallel external surface. It has two or three layers of different metals all electrolytically deposited, the outer or middle layer resp. being ground to uniform outside diameter. This disclosure falls under Art. 54(3) EPC.
- US-A-4024045 discloses the production of a simple metal sleeve by electrolytic deposition on a roller and its subsequent removal therefrom. The roller can be tapered to facilitate removal or the sleeve can be expandable by internal overpressure, and may have a chromium release coating.
- We have previously proposed in BE-A 856427 improved methods of producing printing rolls, particularly for flexographic printing. A sleeve made of plastics material, preferably reinforced plastics material, is fitted onto a roll core which can be of metal construction. Thus, for different printing jobs different sleeves can be used with a common roll core. In order to assist in getting the sleeve on and off the core, the internal diameter of the sleeve is slightly larger at one end than the other, and the external diameter of the core is similarly slightly larger at one end than the other so that the sleeve can be slid partly onto the core before it wedges. The core is provided with apertures in that region which is initially covered by the sleeve and through which compressed air can be forced to slightly expand the sleeve so that it can be slid fully onto the core.
- The present invention, however, provides a sleeve substantially as described in the foregoing paragraph, but made in novel manner entirely of metal so as to provide a conductive path from the inside to the outside of the sleeve to assist in electro-plating the outer surface of the sleeve.
- More particularly, the invention provides a method of making such a sleeve, comprising taking a generally cylindrical mandrel the external diameter of which is slightly larger at one end than the other, and optionally having fluid outlet apertures in a region intermediate its ends, coating the outside surface of the mandrel with a release agent, applying non- electrolytically a first layer of metal over the outside surface of the mandrel, grinding the outside surface of the first metal layer to provide it with a uniform external diameter, and electro-plating an etchable second metal layer onto the first metal layer. Suitably at least one, and preferably both, of the metal layers are copper. It is particularly preferred that said second layer is copper. The outer surface of the second metal layer can be finished in conventional manner to provide a surface suitable for gravure printing. Such finishing may for example take the form of grinding, polishing and eventually etching to provide the imaged surface, and possibly flash chrome-plating to provide a more durable finish.
- The first layer may be provided by spraying molten metal onto the outside surface of the mandrel, the fluid outlet holes having been masked beforehand. Alternatively, the first layer may be applied by straining a preformed metal sheet around the mandrel, with either a helical or a longitudinal butt seam, and welding the seam to secure the layer. In the case of a sprayed metal layer, the fluid outlet holes may be masked before or after application of the release agent, but preferably they are masked after, using metal shim, such as copper shim, which is thereby incorporated in the sprayed metal layer.
- The metal sleeve is at some suitable point in the process removed from the mandrel. This may be done by applying fluid, for example air, under pressure to the apertures in the mandrel so as to slightly expand the sleeve and allow it to be withdrawn axially from the smaller diameter end. Removal from the mandrel may take place when the electro-plated layer has been fully finished. However, it may be desirable to mount the sleeve on different mandrels at different stages during the process; for example for applying the first metal layer, for the electro-plating, and for the etching. In such a case, the sleeve can be removed, in the manner described, from the one mandrel and fitted onto the next mandrel by a process which involves sliding the sleeve over the mandrel until the fluid outlet holes are covered and then applying fluid under pressure to the fluid outlet holes to slightly expand the sleeve so that it can be slid fully onto the mandrel. However, if the sleeve is transferred from one mandrel to another between applying the first layer and the electro-plating application of the second layer, the first layer may not be sufficiently strong or resilient to withstand the fluid pressure without distortion, and other means may be needed for removing it from the first mandrel and fitting it to the second mandrel. This may be achieved by heating and cooling so as to take advantage of thermal expansion and contraction.
- The invention can be further understood by reference to the accompanying drawings wherein:
- Figs. 1, 2 and 3 show diagrammatically in cross-section the stages in fitting a printing sleeve to a roll core;
- Fig. 4 shows a diagrammatically enlarged cross-sectional view of part of one embodiment of sleeve being produced according to the present invention;
- Fig. 5 shows a diagrammatically enlarged cross-sectional view of part of a second embodiment of sleeve being produced according to the present invention; and
- Fig. 6 shows diagrammatically a cross-sectional side view through one end portion of a mandrel and sleeve at the electro-plating stage in an alternative procedure of the present invention.
- Referring to Figs. 1 to 3, the
sleeve 10 is made from a thermosetting resin, such as polyester or epoxy resin, reinforced with glass fibre, which is preferably spirally wound so as to provide hoop strength for the sleeve. Theoutside surface 12 of the sleeve is of uniform diameter, but theinside surface 14 has a very small taper from one end to the other. (This taper is greatly exaggerated in the drawing for the sake of clarity in explanation). The sleeve is removably mounted to aroll core 16, shown separately in Fig. 1, suitably made of steel, having anaxle 18 for rotatably mounting the core. The outside surface of the core is similarly slightly tapered, and is dimensioned so as to allow the sleeve to be manually slid onto the core to rather more than half its length before the sleeve wedges on the core as shown in Fig. 2. Anair supply passage 20 extends axially along the core and emerges atoutlets 22 on the surface of the core about half way along its length. These outlets are thus covered by the sleeve at the point where the sleeve wedges onto the core. Compressed air is then applied through thepassage 20 so as slightly to expand the sleeve and allow it to be completely slid onto the core, as shown in Fig. 3. The supply of air is then discontinued and the sleeve is then firmly fitted to the core. - Referring to Fig. 4; a
steel mandrel 38 on which the sleeve is to be formed has the same general shape and construction as theroll core 16, but its outside diameter, point for point along its length, is very slightly less than that of the roll core to which the sleeve is eventually fitted. In this way, the sleeve thus produced will be slightly undersized with respect to the roll core, and will therefore be a tight fit on it. The mandrel hasair outlets 22 about halfway along its length. In the first stage of construction, the outside surface of the mandrel is covered with alayer 39 of a silicone release agent. Then a strip or hoop of copper shim 40 is fitted around the mandrel so as to cover theoutlets 22. Then a particulate copper composition is sprayed on to form acopper layer 41. This can be done by known techniques, for example by feeding copper rod or powder into a spraying head where a plasma electric arc melts it and forms minute droplets of molten copper which are protected from oxidation by an inert gas while they are sprayed onto the surface of the mandrel. The outside surface of this first layer is then ground so as to produce a uniform outside diameter (as compared with the slightly tapering outside diameter of the mandrel). Then the first copper layer is electro-plated to provide asecond copper layer 42 of desired thickness, the outside surface of which is ground, polished, etched to produce the gravure printing surface, and finally flash chrome-plated. - The sleeve is removed from the mandrel by applying air under pressure to the
outlets 22 which slightly expands the sleeve so that it can be withdrawn lengthwise from the narrower end of the mandrel. - Referring to Fig. 5; in this method, a
similar mandrel 38 is used, and a silicone release agent applied to it. Then a thin sheet ofcopper 43 is strained around the mandrel so as to provide abutt joint 45 which is secured by plasma welding; that is using a very narrow well-defined electric plasma arc flame produced from a tungsten tip with inert gas protection, to locally melt the copper along the seam and weld the two butting edges together. Thereafter this first copper layer is ground to produce a uniform external diameter, before electro-plating the second layer as previously described. - The all copper sleeves of this invention will generally have a somewhat smaller taper than the corresponding reinforced plastics sleeves referred to above. For example a taper of about 1:5000 might be appropriate for the sleeves one metre long.
- In another procedure of the present invention, the mandrel coated with a silicone release agent is heated to about 100°C above ambient temperature. An electrically conductive metal, preferably zinc, is sprayed onto the release coated mandrel to form a metal base sleeve. A typical wall thickness is of the order of 0.5 to 0.8 mm. The mandrel is heated in order to accept more easily the sprayed metal and also to assist in removing the metal base sleeve from the forming mandrel by contraction of the mandrel on cooling.
- The metal base sleeve on the forming mandrel is then machined to a uniform external diameter and is ready for removal from the forming mandrel. The temperature of the mandrel in the meantime has cooled down and in order to remove the metal base sleeve its temperature is raised quickly and it is slid lengthwise off the forming mandrel. Air is not used at this stage for the removal of the metal base sleeve from the mandrel, particularly if the metal base sleeve is made of zinc, since zinc is too soft and the sleeve would be distorted.
- The
metal base sleeve 48 is expanded by heat and slid onto a plating mandrel 50 (Fig. 6). The ends of the sleeve extend beyond the body of the mandrel and are closed by end plugs 52, e.g. of acetal resin, with O-ring seals 54 to prevent the migration of the plating bath solution between the sleeve and the mandrel but allowing the end faces of the sleeve to be plated. For this purpose agap 55 is left between the end faces and the plugs. The metal base sleeve is then plated with copper to a required thickness and is then ground to a finish diameter. The copper layer strengthens the sleeve to such an extent that the sleeve can be removed from the plating mandrel and mounted and demounted from a printing roll core by compressed air as described above.
Claims (10)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3662678 | 1978-09-13 | ||
GB7836626 | 1978-09-13 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0009360A1 EP0009360A1 (en) | 1980-04-02 |
EP0009360B1 true EP0009360B1 (en) | 1984-02-01 |
EP0009360B2 EP0009360B2 (en) | 1991-03-20 |
Family
ID=10499631
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19790301857 Expired EP0009360B2 (en) | 1978-09-13 | 1979-09-10 | Manufacture of printing sleeves |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0009360B2 (en) |
JP (1) | JPS5559992A (en) |
DE (1) | DE2966610D1 (en) |
GB (1) | GB2031801B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005030487A1 (en) * | 2003-10-02 | 2005-04-07 | Drent Holding B.V. | Exchangeable offset printing cylinder sleeve, use of and assembly comprising an offset printing cylinder sleeve of this type |
Families Citing this family (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5718256A (en) * | 1980-07-09 | 1982-01-30 | Dainippon Printing Co Ltd | Method of attaching or detaching sleeve plate for gravure printing |
JPS57191065A (en) * | 1981-05-22 | 1982-11-24 | Dainippon Printing Co Ltd | Method and apparatus for withdrawing gravure sleeve from printing roll |
JPS57146656A (en) * | 1981-03-05 | 1982-09-10 | Dainippon Printing Co Ltd | Sleeve plate for gravure printing and its mounting method on cylinder for printing |
JPS5795464A (en) * | 1980-12-04 | 1982-06-14 | Dainippon Printing Co Ltd | Gravure printing plate and its manufacture |
JPS57191064A (en) * | 1981-05-22 | 1982-11-24 | Dainippon Printing Co Ltd | Method and apparatus for mounting gravure sleeve plate on printing roll |
JPS57191066A (en) * | 1981-05-22 | 1982-11-24 | Dainippon Printing Co Ltd | Gravure plate |
JPS5817140U (en) * | 1981-07-28 | 1983-02-02 | 江守 治 | Cylindrical body for printing etc. |
NL178497C (en) * | 1982-04-16 | 1986-04-01 | Twentse Graveerind | METHOD FOR MANUFACTURING A FLEXIBLE DEEP PRESSURE SLEEVE |
US4503769A (en) * | 1982-06-21 | 1985-03-12 | Armotek Industries, Inc. | Metal coated thin wall plastic printing cylinder for rotogravure printing |
JPS61177293A (en) * | 1985-02-04 | 1986-08-08 | Toyo Ink Mfg Co Ltd | Cylinder for photogravure plate |
JPS61189995A (en) * | 1985-02-19 | 1986-08-23 | Toyo Ink Mfg Co Ltd | Flexoanilox roll |
EP0196443B1 (en) * | 1985-03-29 | 1990-05-23 | Saueressig Gmbh & Co. | Intaglio printing cylinder comprising a core and a detachable sleeve |
DK600285D0 (en) * | 1985-12-20 | 1985-12-20 | Jens Erik Sattrup | PROCEDURE FOR MANUFACTURING A DEEP PRESSURE CYLINDER |
EP0386316B1 (en) * | 1989-03-07 | 1993-12-29 | Landis & Gyr Business Support AG | Method for the production of a sleeve-like matrice and device to carry out the method |
US5216954A (en) * | 1991-10-24 | 1993-06-08 | Thompson William L | Multi-section mountable sleeves and methods for mounting and dismounting same |
DE4140768C2 (en) * | 1991-12-11 | 1994-08-18 | Roland Man Druckmasch | Offset printing form |
DE4303872C2 (en) * | 1992-04-24 | 1995-08-10 | Roland Man Druckmasch | Printing machine with a forme cylinder and process for preparing the forme cylinder |
DE4432816A1 (en) * | 1994-09-15 | 1996-03-21 | Roland Man Druckmasch | Printing roller for channelless printing |
DE19603500A1 (en) * | 1996-01-31 | 1997-08-07 | Polywest Kunststofftechnik | Sleeve for a rotogravure roller, process for its production and working method of the device for the production |
IT1283244B1 (en) * | 1996-03-14 | 1998-04-16 | Rotoincisa Srl | PROCEDURE FOR THE PREPARATION OF SHIRTS TO BE PHOTOGRAPHED, REMOVABLE CYLINDERS FOR ROTOCALCO PRINTING AND SHIRTS OBTAINED |
US6401614B1 (en) * | 1996-03-14 | 2002-06-11 | Rotoincisa S.R.L. | Process for preparing removable metal sleeves for printing machines |
DE19617745C2 (en) * | 1996-05-03 | 2002-06-13 | Heidelberger Druckmasch Ag | Printing machine cylinder with a corrosion protection layer, and method for producing such |
US6832547B2 (en) | 1996-10-16 | 2004-12-21 | Fort James Corporation | Embossing system including sleeved rolls |
WO1999064250A1 (en) * | 1998-06-08 | 1999-12-16 | Mdc Max Dätwyler Bleienbach Ag | Method and device for the treatment of a printing forme for the graphics industry |
US7357892B2 (en) | 2001-11-26 | 2008-04-15 | Fabio Perini S.P.A. | Method of manufacturing cylinder with interchangeable sleeve |
ITFI20010223A1 (en) | 2001-11-26 | 2003-05-26 | Perini Fabio Spa | EMBOSSING CYLINDER WITH INTERCHANGEABLE SHIRT AND WITH FRONT SHIRT LOCKING SYSTEM, AND EMBOSSING GROUP INCLUDING SAID |
WO2003053712A1 (en) * | 2001-12-20 | 2003-07-03 | Rotoincisa S.R.L. | Process for preparing removable metal sleeves for printing machines |
DE10345562B4 (en) * | 2003-10-01 | 2014-09-04 | Sächsische Walzengravur GmbH | Disposable sleeve for releasable attachment either on a support roller or on an adapter sleeve of the support roller for printing, painting and coating |
US20150298451A1 (en) * | 2014-04-17 | 2015-10-22 | Universal Engraving, Inc. | Graphic arts sleeve and support mandrel |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE211250C (en) * | ||||
GB239977A (en) * | 1924-07-24 | 1925-09-24 | Thomas William Stainer Hutchin | Improvements relating to the electro deposition of metals |
US2074860A (en) * | 1933-08-25 | 1937-03-23 | Maro Corp | Process for manufacturing closed receptacles |
GB782767A (en) * | 1955-06-24 | 1957-09-11 | George Edmond Brackenbury Abel | Improvements in the preparation of printing-sleeves by electro-deposition |
US2926940A (en) * | 1956-12-21 | 1960-03-01 | Maass Eberhard | Arrangement of a press connection of a cylindrical inner part and an outer part, e.g. a shaft and a hub, to be joined or disconnected by means of pressure fluid |
US3146709A (en) * | 1962-04-09 | 1964-09-01 | West Essex Printing Plate Inc | Method and apparatus for mounting printing sleeves |
NL291410A (en) * | 1962-04-11 | |||
NL6411984A (en) * | 1964-10-15 | 1966-04-18 | ||
US3751134A (en) * | 1971-09-02 | 1973-08-07 | E Mcmahon | Tracking mounts for celestial ray detecting devices |
JPS5117805A (en) * | 1974-08-02 | 1976-02-13 | Kyodo Engineering | INSATSUYOTA SOBAN |
GB1483371A (en) * | 1974-09-26 | 1977-08-17 | Buckley Ltd M | Printing processes and apparatus |
JPS5163708A (en) * | 1974-09-26 | 1976-06-02 | Emu Ei Batsukuree Engureibingu | |
CH611345A5 (en) * | 1975-03-06 | 1979-05-31 | Buser Ag Maschf Fritz | |
SE7707212L (en) * | 1977-04-04 | 1978-10-05 | Strachan & Henshaw Ltd | PRESSURE SLEEVE |
NL7708600A (en) * | 1977-08-03 | 1979-02-06 | Hubert Dahlhaus En Jan Hendrik | Flexible thin walled rollers prodn. for flat or deep printing - reducing storage and transportation costs and minimising risk of impact damage |
FR2645427A1 (en) * | 1989-04-11 | 1990-10-12 | Cotrel Yves | Transverse fixing bar for spinal osteosynthesis device |
-
1979
- 1979-09-10 EP EP19790301857 patent/EP0009360B2/en not_active Expired
- 1979-09-10 DE DE7979301857T patent/DE2966610D1/en not_active Expired
- 1979-09-10 GB GB7931298A patent/GB2031801B/en not_active Expired
- 1979-09-13 JP JP11681179A patent/JPS5559992A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005030487A1 (en) * | 2003-10-02 | 2005-04-07 | Drent Holding B.V. | Exchangeable offset printing cylinder sleeve, use of and assembly comprising an offset printing cylinder sleeve of this type |
Also Published As
Publication number | Publication date |
---|---|
JPS5559992A (en) | 1980-05-06 |
DE2966610D1 (en) | 1984-03-08 |
GB2031801B (en) | 1982-10-27 |
GB2031801A (en) | 1980-04-30 |
EP0009360B2 (en) | 1991-03-20 |
EP0009360A1 (en) | 1980-04-02 |
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