Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F27/00—Devices for attaching printing elements or formes to supports
  • B41F27/02—Magnetic devices
• • 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

• the invention relates to an elevator of a forme cylinder of a rotary printing press and a method for fastening the elevator to the forme cylinder according to the preamble of claims 1, 5 or 18.
• DE 28 03908 A1 discloses a device for fastening a rubber blanket on a cylinder of a rotary printing press for offset printing, with a printing blanket having several layers being materially connected on its side facing the cylinder to a thin metal plate which is used for fastening with a magnetic cylinder works together.
• the layers of the printing blanket that are cohesively arranged on the metal plate include, among other things, a compressible layer.
• the blanket can be corrected with intermediate layers - usually in offset printing. Plastic foils for the correction of the total strength - to be relined.
• Such layer structures and intermediate layers differ significantly from those for printing plates in high pressure or flexographic printing.
• the US 46 28 815 A shows a device for fastening a printing plate for flexographic printing, the metallic plate being relined in the printable area by an elastic layer, and being held magnetically on the cylinder in the non-elastically relined area.
• DE 38 32 515 A1 discloses the attachment of a pressure plate with an elastic base, the base having magnetic powder for the purpose of attachment to a cylinder surface.
• the US 36 70 646 A shows a printing form for flexographic printing, the printing form on a saddle fixed to the cylinder is arranged.
• the saddle In the area of the printing form ends, the saddle has permanent magnets in the circumferential direction, by means of which the ends of the printing form are held on the saddle.
• a pressure plate has a magnetizable base plate and a rubber layer on the base plate.
• the pressure plate can be attached to a magnetic cylinder by means of magnetic force.
• a forme cylinder disclosed in DE 34 14533 A1 has a base with elastic properties between the printing form and its outer surface.
• the printing form is attached, for example, by means of adhesive films to prevent undesired changes in location, and can also be securely positioned using register aids.
• the invention has for its object to provide an elevator of a forme cylinder of a rotary printing press and a method for attaching the elevator to the forme cylinder.
• an elastic substructure between the printing form and the jacket of the cylinder is advantageous when fastening an elevator to cylinders of rotary printing presses, in particular a printing form of a forme cylinder for a high-pressure or flexographic printing unit.
• This elastic substructure compensates for tolerances in the thickness of the printing form and in the concentricity of the cylinder.
• such a substructure should advantageously be arranged under the printing form, generally a polymer plate. This also applies in particular when there is increased wear on the printing form, for example when using special ones aggressive colors should be avoided. This is, for example, with increased hardness for the printing form - e.g. B. about 70 Shore - achieved in connection with the structure according to the invention.
• a reversibly deformable, elastic substructure is particularly advantageous in order to ensure that the somewhat harder printing form is evenly applied with ink.
• the advantages that can be achieved with the invention consist in particular in that, by executing the elevator in several layers, made of an inner layer of elastic material and an outer layer that bears the printing form with its raised relief, simplified manufacture of the elevator, quality improvements due to less deformation and less fluctuation in tolerance as well as an at least partial recyclability can be achieved.
• An essential of the advantages mentioned is that production is simplified, in particular for printing forms with a raised relief.
• a two-stage production of the printing form whereby, for example, a metal plate is first pre-bent to suit the development and then an elastic substructure is glued on, is not necessary, since the thickness in the split version is smaller than that of a firmly connected, multi-layer printing form, a so-called sandwich plate.
• the risk of collapse, such as exists when a sandwich panel with an elastic substructure that has just been rolled off is advantageously not present. As a result, it is possible to produce the printing form in a flat manner and thus significantly more cost-effectively
• the two layers When assembling the elevator, the two layers can be hung in the area of one end in a register device for the printing form, and then both can be drawn onto the outer surface. This prevents wrinkles and allows the resulting bumps to lie on top of each other.
• Another advantage of the design of the multi-layer elevator is that the elastic substructure which is not firmly connected to the printing form, for example a polymer plate arranged on a sheet, remains usable, while, for example, only the printing form containing the relief is replaced.
• a cylinder 01 for example a forme cylinder 01, is arranged, which has at least magnetic areas on its outer surface 02.
• the magnetic field can be generated by permanent magnets or by electromagnets.
• magnets, in particular permanent magnets, of high magnetic force is advantageous.
• a multi-layer elevator 03 is attached to the lateral surface 02 of the forme cylinder 01 of the rotary high-pressure or flexographic printing machine.
• the multi-layer elevator 03 essentially consists of an inner layer 04, for example an elastic substructure 04, and an outer layer 06, for example a printing form 06.
• the substructure 04 is located on the outer surface 02 between the outer surface 02 and the printing form 06 ,
• the substructure 04 consists of a reversibly deformable and / or elastic, in an advantageous embodiment compressible material or at least has an elastic, compressible layer in the case of a multilayer structure.
• the substructure 04 is single-layer, compressible and closed-pore. By using closed-pore materials for the compressible layer of the substructure 04, a second layer to protect the pores against moisture, color and dirt is not necessary.
• a multi-layer structure of the substructure 04 is also suitable, wherein, particularly when using open-pore materials as a compressible layer, covering the open pores by a second layer, not shown is provided.
• open-pore cell structures such as. B. polyurethane elastomers
• a cover against moisture penetration of the open-cell surface by a plastic such as a film made of polyester. This cover can be provided on both sides of the compressible layer, preferably integrally connected to it.
• the printing form 06 for example a printing form 06 for high or low pressure, is preferably constructed in multiple layers and has a first layer 07 facing the substructure 04 and a second layer 08 which is connected to the first layer 07 in a form-fitting or material-locking manner.
• the first layer 07 of the outer layer 06 has, at least in some areas, on its side 09 facing the outer surface 02 of the cylinder 01, a magnetically attractable material, preferably containing a ferromagnetic material.
• the first layer 07 is designed as a metallic sheet 07, which is attracted to the lateral surface 02 of the cylinder 01 by the magnetic force.
• the second layer 08 On a side 11 of the plate 07 facing away from the lateral surface 02 of the cylinder 01, the second layer 08, which cooperates with a second cylinder or a printing material during the printing process, is arranged.
• the layer 08 is advantageously designed as a polymer plate 08 for high-pressure or flexographic printing, wherein it has a printing relief 12 protruding from the layer 08 on its side facing away from the sheet 07.
• One or more further layers can be arranged between the first 07 and the second layer 08.
• One or more layers, for example a lacquer or protective layer can also be arranged on the side 09 of the layer 07.
• a soft material is used for the printing layer 08, for example with a Shore hardness between 40 ° to 60 °.
• the configuration is that facing away from the cylinder 01 Surface of layer 08 with a Shore hardness of 60 ° to 80 ° possible, which allows the use of more aggressive colors and a stronger mechanical load on the surface.
• Layer 08 can u. U. also be a rubber plate with a relief 12 for flexographic printing.
• the relief 12 can be a negative or a positive shape, depending on the procedure.
• the outer layer 06 is designed as a printing form 06 for high or flexographic printing, the polymer plate 08 being applied directly to the plate 07 as the substrate 07 or as the carrier plate 07.
• the printing form 06 is produced from the sheet metal 07 and the polymer plate 08 or polymer layer 08 according to the doctoring principle and thus has very small thickness tolerances.
• Register devices 13, for example register pins 13, can be arranged on the lateral surface 02 of the cylinder 01 for the precisely fitting support and fastening of the substructure 04 and the printing form 06 during assembly.
• This arrangement of a register pin 13 on the outer surface 02 is particularly simple and allows an otherwise continuous outer surface 02. Due to the magnetic holding, the register device 13 does not have to perform a holding function in the radial direction.
• positions 04 and 06 on the lateral surface 02 can also be positioned in a register-exact manner, such as a stop in the circumferential and / or axial direction of the cylinder 01.
• the layers 04 and 06 can, for example, on a leading end, also be folded and be hooked with this folded end into a narrow channel running in the axial direction of the cylinder 01. By hanging or positioning the substructure 04 using the same register device 13, complicated positioning is avoided. A push of the respective layers 04; 06 on the lateral surface 02 can now be fixed in such a way that it lies in a narrow area and does not enlarge the non-printing area.
• register pins 13 are arranged on the lateral surface 02, then corresponding recesses 14 and 16 are in the base 04 and in the printing form 06 In the form of a slot or as a punch, recesses 14 and 16 of this type are also provided if the register pins 13 are arranged in a channel opening or on a flat surface 02.
• the two layers 04 and 06 of this multilayer elevator 03 can now be produced in a simple manner, since the dimensions of the layers 04 and 06, in particular a thickness d06 of the printing form 06, have become smaller in comparison to a single-layer structure of a multilayer elevator.
• the thickness d06 is composed of a thickness d08 of the polymer layer 08, for example 0.3 ⁇ d08 ⁇ 1 mm, preferably between 0.9 mm and 1 mm, and a thickness d07 of the first layer 07, e.g. 0.1 mm ⁇ d07 ⁇ 0.3 mm, together. Accordingly, a total thickness d06 of the printing form 06 of, for example, 0.4 mm ⁇ d06 ⁇ 1.3 mm is maintained.
• a thickness d04 of the compressible substructure 04 is, for example, between 0.3 mm and 0.7 mm, in a preferred embodiment between 0.4 mm and 0.6 mm. In addition, if the surfaces of the substructure 04 have to be covered, the thickness of the film is added. A length of the register pin 13 is larger than the thickness d04 and smaller than the sum of the thickness d04 and d06.
• the multi-layer elevator 03 consisting of the substructure 04 and the pressure plate 06, is assembled and attached to the cylinder 01 as follows: First, the loose substructure 04, possibly already provided with film on both sides, with its cutouts 14 in the cylinder 01 located register pins 13 inserted. This is used only for register-oriented alignment and securing against slipping in the circumferential direction of the cylinder 01 and not for radial fixation on the lateral surface 02.
• the substructure 04 is held radially on the lateral surface 02 by the printing form 06, which is now also used in register form likewise inserted with their cutouts 16 into the provided register pins and held on the lateral surface 02 of the cylinder 01 by interaction of the magnetic cylinder 01 with the metallic sheet 07.
• the two layers 04; 06 now preferably wound together on the circumference of the cylinder 01. This prevents creasing and unevenness of the substructure 04.
• the substructure 04 arranged between the printing form 06 and the lateral surface 02 is now held on the cylinder 01. It is no longer necessary to glue substructure 04 to cylinder 01 or glue substructure 04 to printing form 06.
• holding or releasing the multi-layer elevator 03 can advantageously take place by switching the current supplying the magnet on and off.

Landscapes

• Printing Plates And Materials Therefor (AREA)
• Rolls And Other Rotary Bodies (AREA)
• Sealing Devices (AREA)
• Manufacture Or Reproduction Of Printing Formes (AREA)
• Valve Device For Special Equipments (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7642276

Family Applications (1)

Country Status (5)

Families Citing this family (2)

Family Cites Families (11)

• 2000
  • 2000-05-17 DE DE10023988A patent/DE10023988B4/de not_active Expired - Fee Related
• 2001
  • 2001-05-15 AU AU2001277452A patent/AU2001277452A1/en not_active Abandoned
  • 2001-05-15 AT AT01955185T patent/ATE285897T1/de not_active IP Right Cessation
  • 2001-05-15 EP EP01955185A patent/EP1284859B1/fr not_active Expired - Lifetime
  • 2001-05-15 DE DE50104971T patent/DE50104971D1/de not_active Expired - Fee Related
  • 2001-05-15 WO PCT/DE2001/001834 patent/WO2001087611A2/fr not_active Ceased

Non-Patent Citations (1)

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