CA2009087A1 - Method for producing plastics cylinders for printing in general, in particular for rotogravure and flexography, and the cylinder obtained - Google Patents
Method for producing plastics cylinders for printing in general, in particular for rotogravure and flexography, and the cylinder obtainedInfo
- Publication number
- CA2009087A1 CA2009087A1 CA002009087A CA2009087A CA2009087A1 CA 2009087 A1 CA2009087 A1 CA 2009087A1 CA 002009087 A CA002009087 A CA 002009087A CA 2009087 A CA2009087 A CA 2009087A CA 2009087 A1 CA2009087 A1 CA 2009087A1
- Authority
- CA
- Canada
- Prior art keywords
- engravable
- plastic material
- cylinder
- expanded plastic
- electro
- 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.)
- Abandoned
Links
Classifications
-
- 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
-
- 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
- B41N1/22—Curved printing plates, especially cylinders made of other substances
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Printing Plates And Materials Therefor (AREA)
- Printing Methods (AREA)
- Ink Jet (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Laminated Bodies (AREA)
Abstract
METHOD FOR PRODUCING PLASTICS CYLINDERS FOR PRINTING IN GENERAL, IN PARTICULAR FOR ROTOGRAVURE AND FLEXOGRAPHY, AND THE CYLINDER
OBTAINED.
ABSTRACT
The method according to the invention consists essentially of (a) preparing an inner cylindrical tube of self-supporting rigid material, advantageously epoxy resin reinforced with glass or carbon filament or fabric, (b) coating said cylindrical tube with an expanded plastics material, advantageously rigid polyurethane, (c) making the outer surface of said coating perfectly smooth, (d) making said outer smooth surface expanded material by applying metallic materials in any manner, and (e) making said electro-conductive surface engravable, advantageously by applying electroplated copper or applying engravable materials of photopolymer type.
OBTAINED.
ABSTRACT
The method according to the invention consists essentially of (a) preparing an inner cylindrical tube of self-supporting rigid material, advantageously epoxy resin reinforced with glass or carbon filament or fabric, (b) coating said cylindrical tube with an expanded plastics material, advantageously rigid polyurethane, (c) making the outer surface of said coating perfectly smooth, (d) making said outer smooth surface expanded material by applying metallic materials in any manner, and (e) making said electro-conductive surface engravable, advantageously by applying electroplated copper or applying engravable materials of photopolymer type.
Description
2 ~
DESCRIPTI0~
This industrial inv~ntlon patent rslatas to a method for produclng plastlcs cylinders for prlntlng ln ~eneral, and in particul~r roto~ravure .1nd i`lexography. Ths patsnt also relatas to ths cylinder obtained by said msthod.
~any methods have been propos~d for producin~ plastlos prlnting cylinders, however such known mathods are ex-tremely compllcated and difflcult to implement, in particular wlth re~ard to coating the baslc plastics cyllnder wlth metal, a~ i5 apparent for exa~pl~
from USA patent 4,503,769 in the name of Andersen Dennis. In additlon, cyllnders produced by conventional methods are of poor rsllabillty or lndeed unraliable.
As is well known, currently used c~li.nders oi good reliability are those of steel construction, and rarely of ~luminium, and thus variou~ problems arise including thuss o~ their weight and their need i`or dynamic balancing. ~urther drawbac~s ar~ wall known -to the expert of tha art An obJeot of the presa~t invention is to pro~ide a mathod i`or produclng cyllnders for printing in ganeral, and in partlcular roto~ravure and ~lexo~raphy, which is very slmp].e to implement uslng any sultable apparatus.
A further obJsct i5 to provids a method of the aforesaid type which enahles plastlcs printin~ cylinders to ba producad which are of maxlmum reliability and low wei~ht, so -that they can be easily handled and stored.
A furthar o~Ject ls to provide a method which enables a pla~tlcs prlntln~ cyllnder to he produGed, the diamster of whlch can be 2 ~ 8 P~
varled at wlll durlng its produ&tiont without encounterlng pnrtlcular di~ficulty.
hese and further ohJect5 of the invention will be apparent to the e~pert of the art from tha following descriptlon.
The method of the lnvention canslsts essentlally of ~a) praparlng an inner cyllndrlcal tu~e of self-supporting ri~id ~aterial, advantageously epoxy resln r~lnforced with glass or carbon filament ar fabrlc, ~b) coating said cylindrical tube with an expanded plastics material, advantageously rlgld polyurethane, ~c) making the outer surface of said coating perfectly smooth, ~d~
maki.n$ said outer smooth surface of the expanded material electro-conductive b~ applylng 3netallic 3~terials in any manner, and (e) 33laklng sald electro-conduotive surface engravable, advantageously by applyin~ electroplated copper or applying en~ravable photopolymer materials.
The stages of the method acoordlng to the ln~ention will be apparent from the followlng example.
A glass fibre fabrlc or yarn i~pregnated with epo~y resin is wound about a perfectly cylindrioal steel mandrel having a $round, lapped and chrol~u3~plated 6urface, untll a thiokness of between 1.5 and 2 mm is obtalned. The struoture 15 then polymeri2ed in conventlonal manner at a temperature of between ~0C and 120~C.
The resultant tube is then mounted on the central shaft of a casting mould consiatlng of a cylinder in which sai/i shaft is centrally po~itloned and which has its inner surfaoe perfectly ground and lapped. The mould is ti~htly closed and a quAntity Q~
polyurethane ls introduoed such that the final expanded produot 2 ~ 7 will have a density of 0.4~0 k~dm~, said polyurethane being prepared by mixin~ Laooyanate and polyol ln stoichiometric proportion in a ~ixln$ machlne.
Both the components and the mould are temperature-controlled at 20-35 C, and preferably at 30C.
On removin~ the ~truoture con~lstin~ of the tube and expanded coating from the mould the surface o~ this coatln~ ls per~eGtly smooth due to the actlon of the lnner mould ~urface. The structurc i~ checked i`or perfect cyllndriclty and if necessary can be ground untll of correct geometry.
The structure ~btained can be made electrically conductive by applylng~ a si.lver or nic~el~based palnt by ~pray or bru6h to a thickness of 20~uc.~ ~opper is then applied in an electroplating tank to a thick~le~s ~ufficient to ~nable the required en~raving of the oylinder ~urface to be effectcd, thi~ -thic~ness belng advantageausly 500~c.
The thlckness oi` the axpanded polyurethane layer can be varled accordin~ to requiremints without varying the dimensiona of the lnternal tuba, ta ell4ble cyllnd~r~ of varlable outer diameter to be mounted on tbe same standard support shaft.
DESCRIPTI0~
This industrial inv~ntlon patent rslatas to a method for produclng plastlcs cylinders for prlntlng ln ~eneral, and in particul~r roto~ravure .1nd i`lexography. Ths patsnt also relatas to ths cylinder obtained by said msthod.
~any methods have been propos~d for producin~ plastlos prlnting cylinders, however such known mathods are ex-tremely compllcated and difflcult to implement, in particular wlth re~ard to coating the baslc plastics cyllnder wlth metal, a~ i5 apparent for exa~pl~
from USA patent 4,503,769 in the name of Andersen Dennis. In additlon, cyllnders produced by conventional methods are of poor rsllabillty or lndeed unraliable.
As is well known, currently used c~li.nders oi good reliability are those of steel construction, and rarely of ~luminium, and thus variou~ problems arise including thuss o~ their weight and their need i`or dynamic balancing. ~urther drawbac~s ar~ wall known -to the expert of tha art An obJeot of the presa~t invention is to pro~ide a mathod i`or produclng cyllnders for printing in ganeral, and in partlcular roto~ravure and ~lexo~raphy, which is very slmp].e to implement uslng any sultable apparatus.
A further obJsct i5 to provids a method of the aforesaid type which enahles plastlcs printin~ cylinders to ba producad which are of maxlmum reliability and low wei~ht, so -that they can be easily handled and stored.
A furthar o~Ject ls to provide a method which enables a pla~tlcs prlntln~ cyllnder to he produGed, the diamster of whlch can be 2 ~ 8 P~
varled at wlll durlng its produ&tiont without encounterlng pnrtlcular di~ficulty.
hese and further ohJect5 of the invention will be apparent to the e~pert of the art from tha following descriptlon.
The method of the lnvention canslsts essentlally of ~a) praparlng an inner cyllndrlcal tu~e of self-supporting ri~id ~aterial, advantageously epoxy resln r~lnforced with glass or carbon filament ar fabrlc, ~b) coating said cylindrical tube with an expanded plastics material, advantageously rlgld polyurethane, ~c) making the outer surface of said coating perfectly smooth, ~d~
maki.n$ said outer smooth surface of the expanded material electro-conductive b~ applylng 3netallic 3~terials in any manner, and (e) 33laklng sald electro-conduotive surface engravable, advantageously by applyin~ electroplated copper or applying en~ravable photopolymer materials.
The stages of the method acoordlng to the ln~ention will be apparent from the followlng example.
A glass fibre fabrlc or yarn i~pregnated with epo~y resin is wound about a perfectly cylindrioal steel mandrel having a $round, lapped and chrol~u3~plated 6urface, untll a thiokness of between 1.5 and 2 mm is obtalned. The struoture 15 then polymeri2ed in conventlonal manner at a temperature of between ~0C and 120~C.
The resultant tube is then mounted on the central shaft of a casting mould consiatlng of a cylinder in which sai/i shaft is centrally po~itloned and which has its inner surfaoe perfectly ground and lapped. The mould is ti~htly closed and a quAntity Q~
polyurethane ls introduoed such that the final expanded produot 2 ~ 7 will have a density of 0.4~0 k~dm~, said polyurethane being prepared by mixin~ Laooyanate and polyol ln stoichiometric proportion in a ~ixln$ machlne.
Both the components and the mould are temperature-controlled at 20-35 C, and preferably at 30C.
On removin~ the ~truoture con~lstin~ of the tube and expanded coating from the mould the surface o~ this coatln~ ls per~eGtly smooth due to the actlon of the lnner mould ~urface. The structurc i~ checked i`or perfect cyllndriclty and if necessary can be ground untll of correct geometry.
The structure ~btained can be made electrically conductive by applylng~ a si.lver or nic~el~based palnt by ~pray or bru6h to a thickness of 20~uc.~ ~opper is then applied in an electroplating tank to a thick~le~s ~ufficient to ~nable the required en~raving of the oylinder ~urface to be effectcd, thi~ -thic~ness belng advantageausly 500~c.
The thlckness oi` the axpanded polyurethane layer can be varled accordin~ to requiremints without varying the dimensiona of the lnternal tuba, ta ell4ble cyllnd~r~ of varlable outer diameter to be mounted on tbe same standard support shaft.
Claims (19)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method for producing a plastic cylinder for printing which process comprises:
preparing an inner cylindrical tube [of given diameter]
from self-supporting rigid material;
coating said cylindrical tube with an expanded plastic material;
smoothing the outer surface of the expanded plastic material coating;
rendering said outer smooth surface electro-conductive;
rendering said electro-conductive surface engravable.
preparing an inner cylindrical tube [of given diameter]
from self-supporting rigid material;
coating said cylindrical tube with an expanded plastic material;
smoothing the outer surface of the expanded plastic material coating;
rendering said outer smooth surface electro-conductive;
rendering said electro-conductive surface engravable.
2. A method according to claim 1 wherein said inner cylindrical tube comprises a material to which said expanded plastic material bonds.
3. A method according to claim 2 wherein said inner cylin-drical tube comprises epoxy resin reinforced with glass or carbon fibre or fabric
4. A method according to claim 2 wherein the inner cylin-drical tube comprises a base material to which the expanded plastic material does not bond, treated to effect said bond.
5. A method according to claim 1 wherein said expanded plastic material is rigid polyurethane.
6. A method according to claim 5 wherein the polyurethane has a density of between 0.400 and 0.500 kg/dm3.
7. A method according to claim 5 wherein the polyurethane has a density of about 0.480 kg/dm3.
8. A method according to claim 1 wherein the outer surface of the expanded plastic material is smoothed by moulding.
9. A method according to claim 1 wherein the outer surface layer is sufficiently thick to allow the cylinder to be ground to a required diameter.
10. A method according to claim 1 wherein said outer smooth surface is rendered electro-conductive by applying a metallic material.
11. A method according to claim 1 wherein the electro-conductive surface is rendered engravable by electroplating copper thereon.
12. A method according to claim 1 wherein the electro-conductive surface is rendered engravable by applying an engravable photopolymer material.
. 13. A plastic cylinder for printing comprising:
an inner cylindrical tube of a self-supporting rigid material of given diameter; and an expanded plastic material coated upon and bonded to said inner cylindrical tube, said expanded plastic material having a smoothed, electro-conductive, engravable outer surface.
an inner cylindrical tube of a self-supporting rigid material of given diameter; and an expanded plastic material coated upon and bonded to said inner cylindrical tube, said expanded plastic material having a smoothed, electro-conductive, engravable outer surface.
14. A cylinder according to claim 13 wherein said inner cylindrical tube comprises epoxy resin reinforced with glass or carbon fibre or fabric.
15. A cylinder according to claim 13 wherein said expanded plastic material comprises rigid polyurethane.
16. A cylinder according to claim 15 wherein said poly-urethane has a density of between 0.400 and 0.500 kg/dm3.
17. A cylinder according to claim 15 wherein said poly-urethane has a density of about 0.480 kg/dm3.
18. A cylinder according to claim 15 wherein the outer surface comprises copper.
19. A cylinder according to claim 15 wherein the outer surface comprises an engravable photopolymer material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT8919541A IT1228855B (en) | 1989-02-23 | 1989-02-23 | PROCEDURE FOR OBTAINING PLASTIC CYLINDERS FOR GENERAL PRINTING, IN PARTICULAR ROTOCALCO AND FLEXOGRAPHY, AND CYLINDER SO OBTAINED. |
| IT19541A/89 | 1989-02-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2009087A1 true CA2009087A1 (en) | 1990-08-23 |
Family
ID=11158901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002009087A Abandoned CA2009087A1 (en) | 1989-02-23 | 1990-02-01 | Method for producing plastics cylinders for printing in general, in particular for rotogravure and flexography, and the cylinder obtained |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0384104B1 (en) |
| JP (1) | JPH02248291A (en) |
| AT (1) | ATE111805T1 (en) |
| AU (1) | AU622809B2 (en) |
| CA (1) | CA2009087A1 (en) |
| DE (1) | DE69012605T2 (en) |
| DK (1) | DK0384104T3 (en) |
| ES (1) | ES2063170T3 (en) |
| IT (1) | IT1228855B (en) |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2059222B1 (en) * | 1991-07-01 | 1995-10-01 | Nacional Moneda Timbre | IMPROVEMENTS INTRODUCED IN ORIGINAL RECORDING REPRODUCTION SYSTEMS. |
| CH684070A5 (en) * | 1991-09-25 | 1994-07-15 | Escher Wyss Ag | Forme cylinder of a rotary printing press. |
| IT1275901B1 (en) * | 1995-03-14 | 1997-10-24 | Rossini Erminio Spa | DOUBLE CONCENTRIC SLEEVE FOR ROTARY PRINT CYLINDER |
| IT1277167B1 (en) * | 1995-03-20 | 1997-11-05 | Rossini Erminio Spa | IMPROVEMENTS TO DEFORMABLE SPINDLES FOR ROTARY PRINTING CYLINDERS |
| DE19545597C2 (en) * | 1995-12-06 | 1999-01-07 | Polywest Kunststofftechnik | Process for producing a sleeve for printing or anilox rollers |
| 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 |
| US5819657A (en) * | 1996-03-11 | 1998-10-13 | Ermino Rossini, Spa | Air carrier spacer sleeve for a printing cylinder |
| DE19633643A1 (en) * | 1996-08-21 | 1998-03-05 | Schepers Druckformtechnik Gmbh | Printing roller or cylinder with a core made of metal or plastic and method for producing the same |
| AU3828100A (en) * | 1999-04-07 | 2000-10-23 | Hyperlast Limited | Improved gravure printing rollers |
| GB0128469D0 (en) * | 2001-11-28 | 2002-01-16 | Keating Gravure Systems Uk Ltd | Printing cylinder manufacture |
| EP1543962B1 (en) * | 2003-12-19 | 2006-11-29 | Fischer & Krecke Gmbh & Co. | Gravure cylinder |
| JPWO2007132734A1 (en) * | 2006-05-11 | 2009-09-24 | 株式会社シンク・ラボラトリー | Gravure plate making roll and method for producing the same |
| DE102008018704B4 (en) | 2008-04-07 | 2013-11-28 | Sächsische Walzengravur GmbH | Gravure or embossing form as sleeve or cylinder |
| EP2202084A1 (en) * | 2008-12-22 | 2010-06-30 | Müller Martini Holding AG | Roller for a printer, printer with the roller and method for producing the roller |
| DE102009007678B4 (en) | 2009-02-03 | 2010-12-16 | Sächsische Walzengravur GmbH | Sleeve as a gravure mold |
| DE102009010080A1 (en) | 2009-02-18 | 2010-08-19 | Sächsische Walzengravur GmbH | Gravure printing form for use as gravure cylinder sleeve, has intermediate layer, separating layer and structured hard material layer arranged one after another on carrier, where hard material layer consists of nickel based alloy |
| DE102009009919A1 (en) | 2009-02-18 | 2010-08-19 | Sächsische Walzengravur GmbH | Gravure printing plate for e.g. rotogravure printing application, has intermediate layer, separation layer and material layer or structured layer or base layer arranged on carrier, where separation layer serves for removal of material layer |
| DE102009010081A1 (en) | 2009-02-18 | 2010-08-19 | Sächsische Walzengravur GmbH | Gravure printing- and embossing mold for use as e.g. sleeve, has functional layer formed as electrically non-conductive polymer layer with electrically conductive layer, and electro-plated metal layer provided on functional layer |
| JP5000682B2 (en) * | 2009-05-01 | 2012-08-15 | 旭化成イーマテリアルズ株式会社 | Laser-engravable cylindrical flexographic printing plate |
| DE202014001960U1 (en) | 2014-02-27 | 2014-03-20 | Sächsische Walzengravur GmbH | Printing or embossing mold |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2051681B (en) * | 1979-06-25 | 1983-03-02 | Drg Ltd | Printing rolls |
| EP0038385A1 (en) * | 1980-04-14 | 1981-10-28 | Karl D. Bardin | Metal plated plastic base intaglio printing cylinders and plates, process and apparatus |
| US4503769A (en) * | 1982-06-21 | 1985-03-12 | Armotek Industries, Inc. | Metal coated thin wall plastic printing cylinder for rotogravure printing |
| NL8302811A (en) * | 1983-08-10 | 1985-03-01 | Anderson & Vreeland Bv | Ink transfer and/or its high-relief print cylinder - has plastic foam on rigid core and holding rigid ink grid or print plate carrier bush |
| JPS62196189A (en) * | 1986-02-25 | 1987-08-29 | Showa Denko Kk | Roll material for photogravure |
-
1989
- 1989-02-23 IT IT8919541A patent/IT1228855B/en active
-
1990
- 1990-01-08 DK DK90100253.5T patent/DK0384104T3/en active
- 1990-01-08 DE DE69012605T patent/DE69012605T2/en not_active Expired - Fee Related
- 1990-01-08 EP EP90100253A patent/EP0384104B1/en not_active Expired - Lifetime
- 1990-01-08 AT AT90100253T patent/ATE111805T1/en not_active IP Right Cessation
- 1990-01-08 ES ES90100253T patent/ES2063170T3/en not_active Expired - Lifetime
- 1990-02-01 CA CA002009087A patent/CA2009087A1/en not_active Abandoned
- 1990-02-09 JP JP2031335A patent/JPH02248291A/en active Pending
- 1990-06-12 AU AU57084/90A patent/AU622809B2/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| ATE111805T1 (en) | 1994-10-15 |
| IT8919541A0 (en) | 1989-02-23 |
| EP0384104A1 (en) | 1990-08-29 |
| EP0384104B1 (en) | 1994-09-21 |
| DK0384104T3 (en) | 1995-02-13 |
| IT1228855B (en) | 1991-07-05 |
| AU622809B2 (en) | 1992-04-16 |
| DE69012605T2 (en) | 1995-01-19 |
| DE69012605D1 (en) | 1994-10-27 |
| AU5708490A (en) | 1991-12-19 |
| JPH02248291A (en) | 1990-10-04 |
| ES2063170T3 (en) | 1995-01-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |