US3425347A - Resilient printing plate - Google Patents
Resilient printing plate Download PDFInfo
- Publication number
- US3425347A US3425347A US712331*A US3425347DA US3425347A US 3425347 A US3425347 A US 3425347A US 3425347D A US3425347D A US 3425347DA US 3425347 A US3425347 A US 3425347A
- Authority
- US
- United States
- Prior art keywords
- plate
- rubber
- printing
- projections
- printing plate
- 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 - Lifetime
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
- B41N1/22—Curved printing plates, especially cylinders made of other substances
-
- 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
- B41N1/12—Printing plates or foils; Materials therefor non-metallic other than stone, e.g. printing plates or foils comprising inorganic materials in an organic matrix
Definitions
- a printing plate including a rubber layer having an outer printing surface and an inner mounting surface formed by a pattern of spaced uniform projections which relieve tension and concavity of the printing surface when the layer is mounted and adhesively secured to a curved backing member.
- the projections comprising the mounting surface may be formed from a softer rubber than the printing surface so that they may readily yield and deform when the printing surface is subjected to excessive localized pressures.
- This invention relates generally to rubber printing plates and the method by which they may be manufactured.
- Printing plates of the type to which the present invention is applicable are made of rubber with the impression to be printed molded into one surface by an appropriate method.
- a major limiting factor in attaining high quality printing with rubber plates has been concavity of the printing surface, a defect commonly called cupping.
- the top printing surface of the plate is drawn into tension causing it to become concave or cupped.
- the center portions of a printing area are pulled down while the edges remain high.
- excessive pressure must be applied to level the concave portions, often causing an undesirable halo" around the printed figures.
- Cupping also occurs, although to a lesser extent, when a rubber plate is vulcanized to a mounting plate.
- the bottom surface of the plate remains dimensionally stable while the top surface is drawn into tension by shrinkage causing concavity in the printing areas.
- a further difliculty in the past with rubber plates is that when excessive pressure exists between the printing plate and the surface being printed, the low viscosity printing ink has a tendency to squeeze out beyond the printing area so that the printed edges are ill-defined. It has been necessary, therefore, that the plates be made and the presses be operated with extreme accuracy so that the pressure applied to each printing area is uniform and within prescribed limits.
- Another object of the invention is to provide a rubber plate that may be curved around a mounting plate and vulcanized thereon without causing concavity or excessive tension on the printing surface. It is a related object to provide a rubber plate which has a bottom surface which will bend easily around a cylinder so as to relieve tension on the printing surface.
- Still another object of the invention is to provide a manufacturing procedure for rubber printing plates that is economical and produces an improved and more durable plate.
- FIG. 1 is a perspective view of a plate cylinder with a metal-backed rubber printing plate mounted thereon;
- FIG. 2 is a fragmentary perspective showing the underside of a rubber plate embodying the present invention
- FIG. 3 is a fragmentary transverse section of a rubber plate embodying the present invention supported on a curved backing plate;
- FIG. 4 is a fragmentary enlarged section of a rubber printing plate illustrating the effect of tension on the printing surface when the features of the present invention are not present;
- FIG. 5 is a partial section view of a rubber printing plate of the present invention when excessive pressure tends to be applied to the printing surface;
- FIG. 6a is a perspective view of a partially cured rubber plate being removed from a mold
- FIG. 6b is a perspective of a rubber plate being cemented to a mounting plate for final vulcanization
- FIG. 6c is a fragmentary section of the cylinder in FIG. 6b showing infra-red rays passing through the wrapping and rubber plate and reflecting back from the mounting plate;
- FIG. 6d is a perspective view of a completed rubberbrass back plate.
- the printing plate 11 is comprised of a rubber plate 12 cemented and vulcanized to a curved backing or mounting plate 13 preferably made of brass, although a non-rigid backing material such as Tefion could be used in the alternative.
- the rubber plate 12 has upraised printing lands 14 molded into its top surface.
- the printing lands 14 may consist of various small raised printing areas having a center portion 14b and an edge or rim 14c.
- the cylinder 10 cooperates with an impression cylinder 20* with which it is rotated in unison (FIG. 5).
- Cupping is caused primarily by the bending of a flat rubber plate into cylindrical shape incident to maintaining it on the backing.
- the base of the plate is forced into a tighter curve than the printing surface with the result that the base is compressed as indicated by the arrows 12a while the printing surface is peripherally tensioned as indicated at 12b.
- the center portion 14b is pulled down toward the cylinder as shown in FIG. 4, leaving the unsupported edges high or cupped. Printing with plates with such concave surfaces results in the defects previously mentioned.
- I provided relief on the underside of the printing plate in the form of a closely-spaced uniform pattern of discontinuties in the peripheral direction defining projections which are spaced sufficiently from one another to prevent the setting up of compressive forces in the peripheral direction at the mounting surface. More specifically in accordance with the present invention I provide, on the under side of the rubber printing plate 12, a two-dimensional pattern of uniformly spaced projections 16 integral with the plate and being of the same height so as to define a mounting surface for adhesive securing to a backing plate. The ends of the projections are cemented at the interface 18 to the backing plate 13. Preferably, the projections are in the form of flattened cylinders 16.
- the first is that the radial distance from a given point adjacent the printing surface to the neutral plane is decreased, thus decreasing the tension at such point; and secondly, the curavture at the neutral plane is reduced.
- relieving or coring out the under side of the plate to define the projections even where carried to only to A of the average plate thickness, reduces the tension at the printing surface to below that at which objectionable cupping will take place.
- a further advantage of the relief provided between the individual projections resides in the increase and control of the cushioning effect for the plate. This is illustrated in FIG. 5, where an impression cylinder 20 is shown pressing a sheet 21 against an upraised printing area '14. While the condition of impression cylinder adjustment shown in FIG. would normally bring about an excessive pressure condition, it will be noted that the projections 16, in the region of contact, deform and yield thereby preventing an excess pressure condition at the printing surface. This cushioning effect is possible since the projections are made of soft rubber with a lower durometer rating than the rubber required for the printing surface.
- the procedure for making the rubber printing plate is to mold and partially cure a rubber layer to form an outside printing surface and an inside mounting surface having a pattern of spaced projections and then to complete the curing operation after the rubber layer has been afiixed to a curved backing plate.
- the rubber plate 22 is formed by molding together and partially vulcanizing two rubber layers in a molding press 23.
- One layer is soft rubber with a durometer hardness rating between 20 and 30, and the other layer is a harder rubber with a durometer rating ranging from 50 to 90.
- the lower plate 24 of the mold 23 imparts the printing areas into the hard rubber layer while the upper plate 25 molds a pattern of cylindrical projections 27 of the type previously described into the soft layer to form a mounting surface for the plate.
- he rubber plate 22 next is taken from the mold and cooled, making it ready for mounting on a backing plate 13.
- the backing plate 13 is coated with curing cement 27.
- the cement also is applied to the mounting surface of the rubber plate, although only the end surfaces 18 of the cylindrical projections are coated with the cement since spaces 19 are to remain between the projections.
- the plate is wrapped in a suitable material 30 such as polyethylene tape for a further curing operation.
- An infra-red heat unit is the preferred means to be used in completing the curing process.
- Infra-red heat has a decidedly different effect on rubber than conventional steam or electric heat.
- a significant advantage is that if additional infra-red heat is applied to cured rubber, the surface will not break down or deteriorate as is often the case when steam or electric heat is applied to rubber after an original vulcanization.
- Steam and electrical heat are directional and to be effective must have direct contact with the rubber, often scorching the rubber surface.
- Infrared heat can penetrate an insulator such as rubber and be bounced back off of brass or other similar backing material with the refiected wave having nearly the same intensity as the initial wave.
- the rubber plate can be laid on the reflective surface and will receive infra-red heat on both surfaces almost instantly and with equal intensity.
- the infra-red rays 31 penetrate the wrapping 30 and the rubber plate 22 to reach the cement and are then reflected by the brass mounting plate.
- the heat cures the end of the projections at the interface 18 to the backing plate 13 and also completes the curing process of the rubber plate in the curved position without scorching the printing surface or the wrapping.
- the infra-red heat is applied to the rubber plate, it expands against the outside wrapping creating a sufiicient overall pressure to secure an even bond between the plate and the backing material.
- the cupping normally caused by bending a rubber plate to a curved backing material is reduced by the subsequent curing process, as well as by the relief provided on the underside of the plate.
- a composite printing plate for use in a printing press comprising a curved backing member, a layer of rubber having an outer printing surface and an inner surface, said layer of rubber being wrapped about said curved backing member, the inner surface being discontinuous in the peripheral direction to provide uniformlyspaced projections integral with the rubber layer and of the same height to define a mounting surface, and said projections being adhesively secured to the backing mem her and being of a height between one-sixteenth and onequarter of the thickness of the rubber layer.
- a composite printing plate for use in a printing press comprising a curved backing member, a layer of rubber having an outer printing surface and an inner surface, said layer of rubber being wrapped about said curved backing member, the inner surface being discontinuous in the peripheral direction to provide uniformly-spaced projections integral with the rubber layer and of the same height to define a mounting surface, and said projections being adhesively secured to the backing member and covering one-third to seven-eighths of the surface area of the rubber layer.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Printing Plates And Materials Therefor (AREA)
- Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US71233168A | 1968-02-29 | 1968-02-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3425347A true US3425347A (en) | 1969-02-04 |
Family
ID=24861674
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US712331*A Expired - Lifetime US3425347A (en) | 1968-02-29 | 1968-02-29 | Resilient printing plate |
Country Status (6)
Country | Link |
---|---|
US (1) | US3425347A (de) |
DE (1) | DE1786166A1 (de) |
FR (1) | FR1595383A (de) |
GB (1) | GB1189747A (de) |
NL (1) | NL6901243A (de) |
SE (1) | SE355994B (de) |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3592134A (en) * | 1968-04-30 | 1971-07-13 | Farrington Business Mach | Imprinter utilizing compensating roller platen |
US3727547A (en) * | 1971-06-17 | 1973-04-17 | Hc Ind | Self-adjusting coding apparatus |
US3768620A (en) * | 1970-09-04 | 1973-10-30 | Honeywell Inc | Print head and platen printer device |
US4403548A (en) * | 1980-01-17 | 1983-09-13 | Champion International Corporation | Printing plate for linear bar symbol code |
US4729313A (en) * | 1985-11-18 | 1988-03-08 | Lincoln Logotype Company, Inc. | Type segment for printing roll |
USRE34134E (en) * | 1985-11-18 | 1992-12-01 | Porelon, Inc. | Type segment for printing roll |
WO2000076769A1 (en) * | 1999-06-16 | 2000-12-21 | Randazzo Jeffrey A | Displacement cushion for flexographic printing plate |
EP1270260A1 (de) * | 2001-06-18 | 2003-01-02 | Jeffrey Albert Randazzo | Schockabsorbierende Unterlage für Flexodruckplatte und Verwendungsverfahren davon |
US20030101885A1 (en) * | 2000-08-08 | 2003-06-05 | 3M Innovative Properties Company | Flexographic printing elements with improved air bleed |
US20050039846A1 (en) * | 1999-05-05 | 2005-02-24 | Schmidt Bradley G. | Method for embossing air-laid webs using laser engraved heated hard rubber embossing rolls |
EP1591270A1 (de) * | 2004-04-26 | 2005-11-02 | CHIORINO S.p.A. | Komprimierbare Schicht für eine Lackierplatte oder ein Drucktuch für den Offsetdruck oder den flexographischen Druck |
US7195810B1 (en) | 1999-04-27 | 2007-03-27 | Fort James Corporation | Air-laid absorbent sheet with sinuate emboss |
WO2013043476A1 (en) | 2011-09-21 | 2013-03-28 | Eastman Kodak Company | Integral cushion for flexographic printing plates |
US8599232B2 (en) | 2011-09-21 | 2013-12-03 | Eastman Kodak Company | Integral cushion for flexographic printing plates |
US20160001544A1 (en) * | 2013-02-18 | 2016-01-07 | Tresu A/S | Anti-bouncing printing roller/sleeve |
US20170348993A1 (en) * | 2015-02-27 | 2017-12-07 | Fujifilm Corporation | Flexographic printing plate, method for manufacturing flexographic printing plate, and flexographic printing plate precursor |
EP3895897A1 (de) * | 2020-04-17 | 2021-10-20 | tesa SE | Plattenzylinder mit wiederverwendbarer adhäsionsfläche |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1119498A (en) * | 1913-12-27 | 1914-12-01 | Samuel E Dittman | Material for building up printing-plates. |
US1559150A (en) * | 1923-09-13 | 1925-10-27 | Edwin A Borden | Means for the treatment of printing plates |
US1669416A (en) * | 1922-10-13 | 1928-05-15 | William C Huebner | Planographic-printing element and process of making same |
US2741297A (en) * | 1952-05-09 | 1956-04-10 | Us Rubber Co | Printing plate material |
US3216353A (en) * | 1962-10-25 | 1965-11-09 | Wallenius Johan Benjamin | Bendable thermoplastic printing plates |
-
1968
- 1968-02-29 US US712331*A patent/US3425347A/en not_active Expired - Lifetime
- 1968-08-19 GB GB39544/68A patent/GB1189747A/en not_active Expired
- 1968-08-26 DE DE19681786166 patent/DE1786166A1/de active Pending
- 1968-12-19 FR FR1595383D patent/FR1595383A/fr not_active Expired
-
1969
- 1969-01-24 NL NL6901243A patent/NL6901243A/xx unknown
- 1969-02-20 SE SE02357/69A patent/SE355994B/xx unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1119498A (en) * | 1913-12-27 | 1914-12-01 | Samuel E Dittman | Material for building up printing-plates. |
US1669416A (en) * | 1922-10-13 | 1928-05-15 | William C Huebner | Planographic-printing element and process of making same |
US1559150A (en) * | 1923-09-13 | 1925-10-27 | Edwin A Borden | Means for the treatment of printing plates |
US2741297A (en) * | 1952-05-09 | 1956-04-10 | Us Rubber Co | Printing plate material |
US3216353A (en) * | 1962-10-25 | 1965-11-09 | Wallenius Johan Benjamin | Bendable thermoplastic printing plates |
Cited By (34)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3592134A (en) * | 1968-04-30 | 1971-07-13 | Farrington Business Mach | Imprinter utilizing compensating roller platen |
US3768620A (en) * | 1970-09-04 | 1973-10-30 | Honeywell Inc | Print head and platen printer device |
US3727547A (en) * | 1971-06-17 | 1973-04-17 | Hc Ind | Self-adjusting coding apparatus |
US4403548A (en) * | 1980-01-17 | 1983-09-13 | Champion International Corporation | Printing plate for linear bar symbol code |
US4729313A (en) * | 1985-11-18 | 1988-03-08 | Lincoln Logotype Company, Inc. | Type segment for printing roll |
USRE34134E (en) * | 1985-11-18 | 1992-12-01 | Porelon, Inc. | Type segment for printing roll |
US7699955B2 (en) | 1999-04-27 | 2010-04-20 | Georgia-Pacific Consumer Products Lp | Air-laid absorbent sheet with sinuate emboss |
US20070126141A1 (en) * | 1999-04-27 | 2007-06-07 | Georgia-Pacific Consumer Products Lp | Air-Laid Absorbent Sheet With Sinuate Emboss |
US7195810B1 (en) | 1999-04-27 | 2007-03-27 | Fort James Corporation | Air-laid absorbent sheet with sinuate emboss |
US6893525B1 (en) | 1999-05-05 | 2005-05-17 | Fort James Corporation | Method for embossing air-laid webs using laser engraved heated embossing rolls |
US20050039846A1 (en) * | 1999-05-05 | 2005-02-24 | Schmidt Bradley G. | Method for embossing air-laid webs using laser engraved heated hard rubber embossing rolls |
US7655105B2 (en) | 1999-05-05 | 2010-02-02 | Georgia-Pacific Consumer Products Lp | Method for embossing air-laid webs using laser engraved heated embossing rolls |
US20070181243A1 (en) * | 1999-05-05 | 2007-08-09 | Georgia-Pacific Consumer Products Lp | Method for Embossing Air-Laid Webs Using Laser Engraved Heated Embossing Rolls |
US7208064B2 (en) | 1999-05-05 | 2007-04-24 | Georgia-Pacific Consumer Products Lp | Method for embossing air-laid webs using laser engraved heated hard rubber embossing rolls |
US6247403B1 (en) * | 1999-06-16 | 2001-06-19 | Jeffrey A. Randazzo | Shock absorber cushion for flexographic printing plate and method of use |
GB2367288B (en) * | 1999-06-16 | 2003-10-15 | Jeffrey A Randazzo | Displacement cushion for flexographic printing plate |
US6666138B2 (en) | 1999-06-16 | 2003-12-23 | Jeffrey A. Randazzo | Shock absorber cushion and method of use |
WO2000076769A1 (en) * | 1999-06-16 | 2000-12-21 | Randazzo Jeffrey A | Displacement cushion for flexographic printing plate |
GB2367288A (en) * | 1999-06-16 | 2002-04-03 | Jeffrey A Randazzo | Displacement cushion for flexographic printing plate |
US6772686B2 (en) * | 2000-08-08 | 2004-08-10 | 3M Innovative Properties Company | Flexographic printing elements with improved air bleed |
EP1800865B2 (de) † | 2000-08-08 | 2013-02-20 | 3M Innovative Properties Company | Druckplatte für flexographisches Drucken |
US20030101885A1 (en) * | 2000-08-08 | 2003-06-05 | 3M Innovative Properties Company | Flexographic printing elements with improved air bleed |
EP1270260A1 (de) * | 2001-06-18 | 2003-01-02 | Jeffrey Albert Randazzo | Schockabsorbierende Unterlage für Flexodruckplatte und Verwendungsverfahren davon |
EP1591270A1 (de) * | 2004-04-26 | 2005-11-02 | CHIORINO S.p.A. | Komprimierbare Schicht für eine Lackierplatte oder ein Drucktuch für den Offsetdruck oder den flexographischen Druck |
WO2013043476A1 (en) | 2011-09-21 | 2013-03-28 | Eastman Kodak Company | Integral cushion for flexographic printing plates |
US8599232B2 (en) | 2011-09-21 | 2013-12-03 | Eastman Kodak Company | Integral cushion for flexographic printing plates |
US20160001544A1 (en) * | 2013-02-18 | 2016-01-07 | Tresu A/S | Anti-bouncing printing roller/sleeve |
US10011106B2 (en) * | 2013-02-18 | 2018-07-03 | Tresu A/S | Anti-bouncing printing roller/sleeve |
US20170348993A1 (en) * | 2015-02-27 | 2017-12-07 | Fujifilm Corporation | Flexographic printing plate, method for manufacturing flexographic printing plate, and flexographic printing plate precursor |
US10513139B2 (en) * | 2015-02-27 | 2019-12-24 | Fujifilm Corporation | Flexographic printing plate, method for manufacturing flexographic printing plate, and flexographic printing plate precursor |
EP3895897A1 (de) * | 2020-04-17 | 2021-10-20 | tesa SE | Plattenzylinder mit wiederverwendbarer adhäsionsfläche |
WO2021209281A1 (en) | 2020-04-17 | 2021-10-21 | Tesa Se | Plate cylinder with reusable adhesion surface |
CN115443216A (zh) * | 2020-04-17 | 2022-12-06 | 德莎欧洲股份公司 | 具有可重复使用的粘附表面的印版滚筒 |
CN115443216B (zh) * | 2020-04-17 | 2024-04-02 | 德莎欧洲股份公司 | 具有可重复使用的粘附表面的印版滚筒 |
Also Published As
Publication number | Publication date |
---|---|
NL6901243A (de) | 1969-09-02 |
DE1786166A1 (de) | 1972-02-03 |
FR1595383A (de) | 1970-06-08 |
SE355994B (de) | 1973-05-14 |
GB1189747A (en) | 1970-04-29 |
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