US3691949A - Pressure cylinder for direct plate printing machines - Google Patents

Pressure cylinder for direct plate printing machines Download PDF

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Publication number
US3691949A
US3691949A US84446A US3691949DA US3691949A US 3691949 A US3691949 A US 3691949A US 84446 A US84446 A US 84446A US 3691949D A US3691949D A US 3691949DA US 3691949 A US3691949 A US 3691949A
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US
United States
Prior art keywords
pressure cylinder
layer
pressure
cylinder according
thickness
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
Application number
US84446A
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English (en)
Inventor
Gualtiero Giori
Daniel Beaune
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.)
KBA Notasys SA
Original Assignee
De la Rue Giori SA
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
Application filed by De la Rue Giori SA filed Critical De la Rue Giori SA
Application granted granted Critical
Publication of US3691949A publication Critical patent/US3691949A/en
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Expired - Lifetime legal-status Critical Current

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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
    • B41F13/18—Impression cylinders
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/909—Resilient layer, e.g. printer's blanket

Definitions

  • a pressure cylinder for a direct plate printing machine comprises a steel cylinder having a peripheral coating of plastic material.
  • the coating has a total thickness of 0.4 mm to 1 mm and comprises an outer layer of polyurethane having a thickness of about 2 mm and a hardness of Shore D 40 to D and at least one inner layerof polyurethane having a hardness of Shore D to D-9 0.
  • the invention relates to pressure cylinders for direct plate printing machines, the pressure cylinders having a surface layer of non-metallic material.
  • a pressure cylinder is provided for pressing paper to be printed, under high pressure, against a rigid inked printing plate or engraved cylinder, in order that a perfect transfer can be made, of color from the engraved lines or grooves on the printing plate or cylinder to the paper.
  • the pressure cylinder is provided with an outer elastic surface layer or cover-
  • the pressure imparted by the pressure cylinder to the paper can be in the order of 1,000 kp for each cm of contact line, that is to say, the line between the periphery of the pressure cylinder and the paper. Consequently, the outer elastic surface layer of the pressure cylinder is submitted, in direct plate printing machines, to a very heavy load, so that the choice of a material for the surface layer is very critical.
  • Direct plate printing machines which use a pressure cylinder for printing sheets, the outer elastic surface layer of which is made of a material, such as, rubber or English leather or like material having a hardness of about Shore A 98.
  • the life duration of such materials is found to be relatively short, that is to say, a useful life of about 100,000 printings, so that the outer elastic surface layer or cover of the printing drum must be changed very frequently.
  • the cost of frequently changing the outer elastic surface layer is very high.
  • the layers of compressed paper are pressed again during the printing operation, the pressure applied by the pressure cylinder must frequently be controlled. Moreover, the layers of compressed paper are subjected, because of a very heavy pressure on the whole thickness of the layers, to heating.
  • the thickness of the layers may, for example, be 70 mm. It is therefore not possible to print the reverse side of already printed paper bands with such pressure cylinder, otherwise the printing color would adhere on the surface layer of the pressure cylinder because of the high temperature of the layer of compressed paper.
  • An object of the present invention is to provide a pressure cylinder which substantially avoids the drawbacks of known pressure cylinders for direct plate printing machines and which has a surface layer which can be manufactured in a very easy way, for example, by the user of the printing machine.
  • a further object of the present invention is the provision of a pressure cylinder, the hardness of the outer surface layer of which allows an optimal pressure to be exerted by the cylinder while at the same time having a life duration longer than that of known surface layers.
  • a pressure cylinder for a direct plate printing machine comprising an outer surface layer made of a non-metallic synthetic material, having a hardness between Shore D 20 and D
  • the synthetic material can be hardened by heat treatment, and is, for example, a polyurethane.
  • the outer surface layer is composed of a unitary plastics material having a thickness of between 0.2 mm and 1 mm and a hardness between Shore D 50 and D 15.
  • the thickness of the layer is between 0.4 mm and 1 mm and comprises an external covering layer having a surface hardness of between Shore D 40 and D 60 preferably D 50 and a lower layer beneath the external covering layer having a hardness between Shore D 80 and D both layers of different hardness being made from the same type of synthetic material.
  • an external covering layer is provided, giving an optimal pressure, while the material of the lower layer which is of preference mixed with carbon black or carbonate of calcium in a proportion between 5 and 15 percent by weight, gives a higher rigidness for obtaining a good steadiness of the outer surface layer.
  • the whole layer thickness is of preference, in the last embodiment, between 0.4 mm and 1 mm, but it is possible for the thickness to be as little as 0.2 mm.
  • a method of making a pressure cylinder for a direct plate printing machine comprises the steps of applying successive layers of a synthetic material to the peripheral surface of a cylinder permitting the layers to harden, binding the layers together and working the outside covering layer to obtain a smooth finish.
  • each layer is applied to the drum in a wet condition, is allowed to dry, and is then provided with a thin cover of binding material before the next layer is applied.
  • FIG. 1 is a schematic side view of a part of a pressure cylinder according to one embodiment of the invention.
  • FIG. 2 is a schematic side view of a part of a pressure cylinder according to a different embodiment of the invention.
  • a pressure cylinder for a'dire'ct plate printing machine comprises a steel cylinder I having on its peripheral surface. an outer surface layer 2.
  • the outer surface layer 2 includes an extemal' covering layer-2a having'a thickness of substantially 0.2 mm and with-carbon'black or calciumzcarbonate in. order to reduce the: flexibility of the lowerlayers.
  • the pressure cylinder according to the above described embodiments has a life duration which is usually much longer than that of the known pressure cylinders used in sheet printing machines and at least as long as the life of a pressure cylinder provided with a compressed paper layer.
  • the pressure cylinder of the embodiments is simple and cheap to'manufacture and duringoperation is submitted to no compression and no heating, so that, in particular, the backside of paper bands already printed'on the front side, can be printed with the pressure cylinder of theernbodiments.
  • a cylinder for example, of steel is first degreased with trichloroethylene, mounted in a lathe and then a-thin'layer of a binding material of the material with black carbon or calcium carbonate comprising a proportion between 5 and 15 percent by weight of the mixture.
  • the carbon black and calcium I carbonate act as stiffening materials.
  • a synthetic material of the same type can be used for the covering layer, which includes a plastifier' as one of its constituents, and thereby after hardening as -a hardness between Shore D 40 and D 60, preferably D
  • the thickness of each lower layer is about 0.2 mm and the initial thickness of the covering layer is about 0.4 mm given the fact that duringthe mechanical working of the covering layer an externallayer of about 0.2 mm is removed. In that way, it is ensured that the covering layer of the finished synthetic drum has a thickness of about 0.2 mm.
  • the thickness of various lower layers can also vary between 0.15 mm and 0.3 mm, while, when for the external layer a synthetic material of another composition is chosen, that covering layer must be of about 0.2 mm thicker taking into account the following-mechanical working, that is to say 0.2 mm thicker then the required thickness of that layer.
  • ha direct'plate printingmachine having an em graved inked plate or cylinder, a pressure cylinder for pressing paper to be printed against said'engraved inked plate or'cylinderunder high pressure, said pressure cylinder comprising a steel cylinder having a peripheral coating of synthetic plastic material, said coating having a-totalthickness of 0.4 mm to 1 mm and comprising an outer layer having a thickness of approximately 0.2 mmand a surface hardness Shore D 40 to D and at least one inner layer having a hardness of Shore D to D said'outer and inner layers being of the same type of plastic material.
  • a pressure cylinder according to claim 2 in which said inner layer contains stiffening material selected from the group consisting of carbon black and calcium carbonate.
  • a pressure cylinder according to claim 3 in which the amount of said stiffening material in said inner layer is between 5 and 15 percent by weight.
  • a pressure cylinder according to claim 1 in whic said outer layer has a smooth surface.
  • a pressure cylinder according to claim 1 in which said coating of plastic material is bonded on sheet steel fixed on the peripheral surface of said steel cylinder.
  • A'pressure cylinder according to claim 1' in which said coating of plasticv material is bonded directly onto said steel cylinder.
  • a pressure cylinder according to claim 1 in which said inner layer has a greater thickness than said outer layer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
US84446A 1969-10-27 1970-10-27 Pressure cylinder for direct plate printing machines Expired - Lifetime US3691949A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1597369A CH497283A (de) 1969-10-27 1969-10-27 Druckzylinder für Stahlstichdruckmaschinen

Publications (1)

Publication Number Publication Date
US3691949A true US3691949A (en) 1972-09-19

Family

ID=4413467

Family Applications (1)

Application Number Title Priority Date Filing Date
US84446A Expired - Lifetime US3691949A (en) 1969-10-27 1970-10-27 Pressure cylinder for direct plate printing machines

Country Status (9)

Country Link
US (1) US3691949A (de)
JP (1) JPS5134322B1 (de)
AT (1) AT306747B (de)
CA (1) CA920426A (de)
CH (1) CH497283A (de)
DE (1) DE2050663C3 (de)
FR (1) FR2066558A5 (de)
GB (1) GB1310276A (de)
SE (1) SE377778B (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3981237A (en) * 1973-02-21 1976-09-21 Rhodes John M Plastic rotary printing screens construction method therefor
US4028786A (en) * 1974-10-08 1977-06-14 Canathane Roller Corporation Limited Printing and like rollers
US4178200A (en) * 1977-03-09 1979-12-11 Mannesmann Aktiengesellschaft Pressure roll for jacketing steel pipes with thermoplastic strip
US4293989A (en) * 1978-06-10 1981-10-13 Hermann Kronseder Glue roller for labelling machine
US5324885A (en) * 1991-03-22 1994-06-28 Seiko Epson Corporation Roller member for an electrophotographic device
US5398604A (en) * 1993-02-23 1995-03-21 Heidelberger Druckmaschinen Ag Removable nip sleeve
US5797322A (en) * 1996-01-31 1998-08-25 Polywest Kunstofftechnik, Sauressig & Partner Gmbh & Co. Kg Printing sleeve for a flexographic or gravure printing roll
US6116159A (en) * 1998-07-23 2000-09-12 Kabushiki Kaisha Tokyo Kikai Seisakusho Paper wrinkle preventing device
US20080156212A1 (en) * 2004-03-30 2008-07-03 Hiroshi Yamada Hollow Cylindrical Printing Element

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2248191A (en) * 1938-04-22 1941-07-08 United Shoe Machinery Corp Abrading machine
US2374194A (en) * 1941-08-30 1945-04-24 Interchem Corp Pressure roller
GB662180A (en) * 1948-04-20 1951-12-05 Semperit Ag Improvements relating to printing blocks
US2741297A (en) * 1952-05-09 1956-04-10 Us Rubber Co Printing plate material
US2997406A (en) * 1957-06-03 1961-08-22 Warren S D Co Method and apparatus for cast-coating paper
US3002866A (en) * 1956-05-15 1961-10-03 Us Rubber Co Inking roll
US3053718A (en) * 1958-07-03 1962-09-11 Kimberly Clark Co Compressed top press sheet
US3085507A (en) * 1962-03-22 1963-04-16 Lawrence S Kunetka Rubber printing plate with built-in curvature
US3139826A (en) * 1961-06-19 1964-07-07 Phillips Petroleum Co Inking roller for printing machines
US3147698A (en) * 1958-10-16 1964-09-08 Grace W R & Co Compressible material for use in printing
US3592134A (en) * 1968-04-30 1971-07-13 Farrington Business Mach Imprinter utilizing compensating roller platen

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2248191A (en) * 1938-04-22 1941-07-08 United Shoe Machinery Corp Abrading machine
US2374194A (en) * 1941-08-30 1945-04-24 Interchem Corp Pressure roller
GB662180A (en) * 1948-04-20 1951-12-05 Semperit Ag Improvements relating to printing blocks
US2741297A (en) * 1952-05-09 1956-04-10 Us Rubber Co Printing plate material
US3002866A (en) * 1956-05-15 1961-10-03 Us Rubber Co Inking roll
US2997406A (en) * 1957-06-03 1961-08-22 Warren S D Co Method and apparatus for cast-coating paper
US3053718A (en) * 1958-07-03 1962-09-11 Kimberly Clark Co Compressed top press sheet
US3147698A (en) * 1958-10-16 1964-09-08 Grace W R & Co Compressible material for use in printing
US3139826A (en) * 1961-06-19 1964-07-07 Phillips Petroleum Co Inking roller for printing machines
US3085507A (en) * 1962-03-22 1963-04-16 Lawrence S Kunetka Rubber printing plate with built-in curvature
US3592134A (en) * 1968-04-30 1971-07-13 Farrington Business Mach Imprinter utilizing compensating roller platen

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3981237A (en) * 1973-02-21 1976-09-21 Rhodes John M Plastic rotary printing screens construction method therefor
US4028786A (en) * 1974-10-08 1977-06-14 Canathane Roller Corporation Limited Printing and like rollers
US4178200A (en) * 1977-03-09 1979-12-11 Mannesmann Aktiengesellschaft Pressure roll for jacketing steel pipes with thermoplastic strip
US4293989A (en) * 1978-06-10 1981-10-13 Hermann Kronseder Glue roller for labelling machine
US5324885A (en) * 1991-03-22 1994-06-28 Seiko Epson Corporation Roller member for an electrophotographic device
US5424815A (en) * 1991-03-22 1995-06-13 Seiko Epson Corporation Developing device
US5398604A (en) * 1993-02-23 1995-03-21 Heidelberger Druckmaschinen Ag Removable nip sleeve
US5507226A (en) * 1993-02-23 1996-04-16 Heidelberger Druckmaschinen Ag Removable nip sleeve
US5797322A (en) * 1996-01-31 1998-08-25 Polywest Kunstofftechnik, Sauressig & Partner Gmbh & Co. Kg Printing sleeve for a flexographic or gravure printing roll
US6116159A (en) * 1998-07-23 2000-09-12 Kabushiki Kaisha Tokyo Kikai Seisakusho Paper wrinkle preventing device
US20080156212A1 (en) * 2004-03-30 2008-07-03 Hiroshi Yamada Hollow Cylindrical Printing Element

Also Published As

Publication number Publication date
FR2066558A5 (de) 1971-08-06
DE2050663C3 (de) 1975-01-30
GB1310276A (en) 1973-03-14
CH497283A (de) 1970-10-15
CA920426A (en) 1973-02-06
DE2050663B2 (de) 1974-06-12
AT306747B (de) 1973-04-25
SE377778B (de) 1975-07-28
DE2050663A1 (de) 1971-04-29
JPS5134322B1 (de) 1976-09-25

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