EP0514344B1 - Blanchet d'impression tubulaire sans fente - Google Patents

Blanchet d'impression tubulaire sans fente Download PDF

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Publication number
EP0514344B1
EP0514344B1 EP92810364A EP92810364A EP0514344B1 EP 0514344 B1 EP0514344 B1 EP 0514344B1 EP 92810364 A EP92810364 A EP 92810364A EP 92810364 A EP92810364 A EP 92810364A EP 0514344 B1 EP0514344 B1 EP 0514344B1
Authority
EP
European Patent Office
Prior art keywords
layer
compressible
blanket
tubular
sleeve
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
EP92810364A
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German (de)
English (en)
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EP0514344A1 (fr
Inventor
James B. Vrotacoe
Glenn Alan Guaraldi
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.)
Goss International Americas LLC
Original Assignee
American Roller Co
Heidelberg Harris Inc
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
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Application filed by American Roller Co, Heidelberg Harris Inc filed Critical American Roller Co
Priority to DE9218764U priority Critical patent/DE9218764U1/de
Priority to EP95119776A priority patent/EP0715966A1/fr
Publication of EP0514344A1 publication Critical patent/EP0514344A1/fr
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Publication of EP0514344B1 publication Critical patent/EP0514344B1/fr
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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
    • B41N10/00—Blankets or like coverings; Coverings for wipers for intaglio printing
    • B41N10/02—Blanket structure
    • B41N10/04—Blanket structure multi-layer
    • 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
    • B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
    • B41N2210/04—Intermediate layers
    • 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
    • B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
    • B41N2210/14—Location or type of the layers in multi-layer blankets or like coverings characterised by macromolecular organic compounds
    • 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

  • the invention relates to blankets for blanket cylinders in web offset printing presses and in particular to a gap-free, sleeve-shaped blanket.
  • rubber blanket be it as an independent word or be used in word compositions, this generally means a “printing blanket made of an elastic material”.
  • a web offset printing press typically comprises a plate cylinder, a blanket cylinder and a printing cylinder, which are rotatably mounted in the printing press.
  • the plate cylinder carries a printing plate with a hard surface, which determines the image to be printed.
  • the blanket cylinder carries a blanket with an elastic surface, which comes into contact with the printing plate in the nip between the plate cylinder and the blanket cylinder.
  • a web to be printed moves through the nip between the blanket cylinder and the impression cylinder. Color is applied to the printing plate on the plate cylinder.
  • a colored print image is picked up by the blanket in the nip between the blanket cylinder and the plate cylinder and transferred to the web.
  • the impression cylinder can be another blanket cylinder for printing on the opposite side of the web.
  • a conventional rubber blanket is made as a flat plate.
  • Such a blanket is supported on a blanket cylinder by wrapping the plate around the blanket cylinder and securing the respective ends of the plate in an axially extending gap in the blanket cylinder.
  • the adjacent respective ends of the plate define a gap which extends axially along the length of the rubber blanket.
  • the blanket gap moves through the nip between each revolution of the blanket cylinder Blanket cylinder and the plate cylinder and also through the nip between the blanket cylinder and the impression cylinder.
  • the rubber blanket cylinder and the adjacent cylinder are each relieved or relieved of pressure.
  • This repeated pressure relief or stress on the blanket gap causes vibrations and shock loads on the cylinders throughout the press.
  • vibrations and shock loads adversely affect print quality.
  • the nip in the blanket triggers pressure relief and stress in the nip between the blanket cylinder and the plate cylinder
  • printing takes place on the web moving through the nip between the blanket cylinder and the impression cylinder. Any movement of the blanket cylinder or blanket caused by pressure relief and loading at this time can smear the print image transferred from the blanket to the web.
  • Another problem that arises from the gap between the adjacent ends of a conventional blanket is the circumferential emptiness determined by the width of the gap. This from the width of the gap certain emptiness interrupts and reduces the circumferential length of the printing surface on the blanket cylinder. As a result, an area of the web remains unprinted with each revolution of the blanket cylinder. These unprinted areas of the web reduce productivity and increase waste. In addition, it is not easy to correctly install such a conventional blanket on a blanket cylinder. This can result in significant downtime, which can be expensive. In addition, the blanket cylinder itself must be equipped with means for attaching the respective ends of the blanket to keep it in place.
  • a point on the elastic surface of the rubber blanket is directed sideways for a greater distance as it moves through the nip. This means that these surfaces at the nip have different speeds. A difference in the surface speed can slip between the Surfaces cause what can smear the ink transferred from one surface to the other.
  • US 4,812,357 discloses a rubber blanket which is constructed from a plurality of layers lying one above the other.
  • a base layer consists of at least two woven textile layers, which are connected to one another by means of an adhesive layer.
  • An elastic layer is applied to this base layer, on which in turn an elastomer-reinforced layer is attached.
  • the elastomer-reinforced layer carries the color-guiding surface with which a print image can be printed on a material web.
  • rubber blankets contain compressible, rubber-like polymers which can be compressed under the pressure exerted by the printing plate in the nip. Pressing the blanket together in the nip reduces the tendency for beads to form on both sides of the nip. Standing waves that could smear the printing ink on the rotating rubber blanket are thus reduced; however, repeated compression and expansion of the compressible rubbery polymer can cause the blanket to overheat.
  • EP-A-0 421 145 relates to a lithographic printing machine.
  • a tubular rubber blanket which is removably attached to a blanket cylinder and has a coherent, gap-free outer surface, is in rolling contact with a pressure plate on a plate cylinder.
  • the blanket consists at least partially of a compressible material which is pressed together by the plate cylinder at a pressure gap between the plate cylinder and the blanket cylinder.
  • the outer surface of the rubber blanket has a peripheral speed that is immediate at points in front of the printing nip, at the printing nip and immediately behind the printing nip, in order to prevent smearing of the printed image at the printing nip.
  • the rubber blanket can comprise an outer layer made of non-compressible material and an inner layer made of compressible material.
  • the outer layer of the rubber blanket is deformable in order to compress the inner layer of the rubber blanket.
  • the inner layer contains a large number of bubbles which are relatively large before the outer layer of the rubber blanket is deformed by a pressure plate on the plate cylinder and which are relatively small in a partial area of the inner layer of the rubber blanket which is then compressed by deformation of the outer layer of the rubber blanket.
  • the blanket has an inner metal bushing which is tensioned by the blanket cylinder, thereby holding the blanket on the blanket cylinder.
  • EP-A-0 452 184 discloses a multi-layer rubber blanket sleeve with a rubber layer containing cells adhering to the cylinder, on which a layer of hard elastomer and then a pressure layer are applied.
  • the present invention provides a sleeve-shaped blanket which enables a printing machine to run at high speeds without excessive vibration or shock, without slippage of the printing surfaces - which could smear the ink - and without overheating.
  • the sleeve-shaped rubber blanket further comprises a seamless, sleeve-shaped printing layer with a continuous, gap-free cylindrical printing surface.
  • the sleeve-shaped rubber blanket according to the invention advantageously has a seamless and gap-free sleeve-like shape through its various layers, including a continuous, gap-free cylindrical printing surface.
  • a blanket cylinder and a plate cylinder When the sleeve-shaped blanket moves through the nip between a blanket cylinder and a plate cylinder, its profile at the nip remains unchanged.
  • the pressure ratio between the sleeve-shaped rubber blanket and the printing plate thus remains constant during the operation of the printing press, and the movement of the sleeve-shaped rubber blanket through the nip does not cause vibrations or shock loads. There is also less waste and increased productivity because there is no gap on the surface of the sleeve-shaped rubber blanket.
  • the inextensible layer of the sleeve-shaped rubber blanket prevents standing waves from forming on the outer printing surface, which could smear the inked printed image.
  • the cavities in the compressible layer of the tubular rubber blanket are micropores.
  • the micropores are formed by compressible microspheres, which are evenly distributed in the first sleeve-shaped body made of elastic polymer.
  • the compressible layer preferably comprises a compressible tissue together with compressible microspheres.
  • the compressible fabric is contained as a spiral thread through the compressible layer and around the underlying cylindrical sleeve. The thread heats up less than the surrounding elastic polymer when the tubular rubber blanket is actuated, so that the tubular rubber blanket remains cooler during operation.
  • the compressible layer is coated by coating a compressible thread a mixture of rubber putty and microspheres and formed by spirally winding the coated thread around the cylindrical sleeve.
  • the non-stretchable layer is similarly formed by coating a non-stretchable thread with a rubber cement that does not contain micropores and spirally winding the coated thread around the compressible layer underneath.
  • the inextensible thread thus forms a circumferentially inextensible sleeve-shaped lower layer, and gives the inextensible layer the inextensibility.
  • the pressure layer is formed over the inextensible layer by wrapping an unvulcanized elastomer over the inextensible layer and securing it with adhesive tape.
  • the bonded structure is vulcanized so that the overlying layers of elastic polymer take on an endless, seamless, sleeve-like shape.
  • a printing unit 10 which has a blanket cylinder with a sleeve-shaped blanket 14, which was produced according to the present invention.
  • the printing unit 10 is, for example, an offset printing machine with a multiplicity of rollers for transferring printing ink from an ink fountain 16 to a printing plate 18 located on a plate cylinder 20.
  • the sleeve-shaped blanket 14 on the blanket cylinder 12 transfers the colored printing image from the printing plate 18 to a continuous web 21.
  • An ink fountain roller 22 receives ink from the ink fountain 16.
  • a lift roller 24 reciprocates between the ink fountain roller 22 and a first rub roller 26 to transfer ink from the ink fountain roller 22 to the first rub roller 26, as shown in FIG. 1.
  • a plurality of successive rubbing rollers 26 transfer ink from the first rubbing roller 26 to a group of inking rollers 28, which in turn transfer the ink to the printing plate 18 located on the plate cylinder 20.
  • a second blanket cylinder 30 with a second sleeve-shaped blanket 32 is only partially shown in FIG. 1 as an illustration of a second printing unit for simultaneous printing on the opposite side of the web 21.
  • the blanket cylinders 12 and 30 serve as printing cylinders for one another.
  • the rollers and cylinders are connected to one another by gears and are driven by drive devices in a known manner.
  • the lifting roller 24 is moved in a known manner by a reciprocating mechanism 36.
  • the sleeve-shaped rubber blanket 14 has an endless, gap-free cylindrical inner surface 40 which is in close frictional contact with the cylindrical outer surface 42 of the rubber blanket cylinder 12.
  • the blanket cylinder 12 has an inner lumen 44 and a plurality of passages 46 which extend radially from the inner lumen 44 to the cylindrical outer surface 42.
  • a source 50 of pressurized gas communicates with the inner lumen 44 in the blanket cylinder 12 and generates a stream of pressurized gas which is directed from the inner lumen 44 and the radially extending passages 46 onto the cylindrical inner surface 40 of the sleeve-shaped blanket 14 is.
  • the cylindrical inner surface 40 of the sleeve-shaped rubber blanket 14 elastically contracts back to its original size and engages on the cylindrical outer surface 42 of the rubber blanket cylinder 12.
  • the sleeve-shaped blanket 14 is then in firm frictional contact with the blanket cylinder 12 and will not move relative to the blanket cylinder 12 during operation of the printing unit 10.
  • the sleeve-shaped rubber blanket 14 consists of a plurality of layers, namely it comprises a relatively rigid carrier layer 60 and a number of flexible layers supported by the carrier layer 60.
  • the flexible layers are first and second compressible layers 62 and 64, an inextensible layer 66 and a pressure layer 68.
  • the carrier layer 60 is formed by a cylindrical sleeve 70, on which the cylindrical inner surface 40 is located.
  • the cylindrical sleeve 70 is elastically slightly extensible circumferentially to facilitate the telescopic movement of the sleeve-shaped rubber blanket 14 over the rubber blanket cylinder 12, as described above.
  • the cylindrical sleeve 70 is preferably made of metal, such as nickel, and has a thickness of approximately 13 mm, which has been found to have the required rigidity, strength and elastic properties.
  • the cylindrical sleeve 70 made of polymers such as glass fiber or plastic, for example Mylar (trademark), with a thickness of approximately 76 mm.
  • Two primer coatings help bind the first compressible layer 62 to the support layer 60.
  • the backing layer 60 is a nickel cylinder
  • the first primer 71 is preferably Chemlok 205
  • the primer 72 is preferably Chemlok 220, both available from Lord Chemical Company.
  • the first compressible layer 62 comprises, as shown in Fig. 3, a seamless sleeve-shaped body 74 made of an elastic polymer.
  • the sleeve-shaped body 74 has a multiplicity of cavities which give the sleeve-shaped body 74 compressibility.
  • the cavities are micropores formed by a plurality of compressible microspheres 76 embedded in the sleeve-shaped body 74.
  • the cavities in the sleeve-shaped body 74 could be made of embedded particles of a compressible material other than
  • the microspheres 76 are formed or are produced by swelling, leaching or by means of other known methods which form voids in an elastic body.
  • the first compressible layer 62 further includes a compressible thread 80 which extends spirally through the sleeve-shaped body 74 and around the carrier layer 60.
  • the thread 80 is impregnated with the elastic polymer of the sleeve-shaped body 74 and with the microspheres 76.
  • the second compressible Layer 64 likewise consists of a seamless, sleeve-shaped body 90 made of an elastic polymer, a number of compressible micropores 92 embedded in the sleeve-shaped body 90 and a compressible thread 94 which spirally extends through the sleeve-shaped body 90 and around the first compressible layer 62 extends.
  • the elastic polymer from which the seamless, sleeve-shaped bodies 74 and 90 are formed is preferably mixed with the microspheres 76 and results in a compressible rubber cement of the following composition: Parts 1. Butadiene copolymer and acrylonitrile with 50 parts of dioctyl phthalate (DOP) 480.00 2nd soft sulfurized factice (oil rubber) 40.00 3rd Acrylonitrile / butadiene copolymer 80.00 4th Medium thermal soot 360.00 5. Barium sulfate 80.00 6. Dioctyl phthalate 40.00 7. Benzthiazole disulfide accelerator 8.00 8th. Tetramethyl thiuram disulfide accelerator 4.00 9.
  • the microspheres 76 and 92 are preferably the Expancel microspheres known under the trademark Expancel 461 DE from Sundsvall, Sweden. These microspheres have a shell, mainly consisting of a copolymer of vinylidene chloride and acrylonitrile, and contain gaseous isobutane. Other microspheres that have the desired compressibility properties can also be used, e.g. those disclosed in U.S. Patent No. 4,770,928.
  • the compressible threads 80 and 94 are preferably cotton threads approximately 0.13 to 0.76 mm (0.005-0.030 inch) in diameter, most preferably approximately 0.38 mm (0.015 inch) in diameter.
  • the individual thread winding, ie the circumferentially adjacent thread sections, are preferably axially spaced approximately 0.25 mm apart. This close spacing ensures that there is practically none There are gaps between the windings.
  • threads 80 and 94 can each be made of a different compressible material or can be replaced with compressible tubes.
  • the non-stretchable layer 66 comprises a seamless sleeve-shaped body 100 made of an elastic polymer and a longitudinally inextensible thread 102 located within the sleeve-shaped body 100.
  • the thread 102 extends spirally through the sleeve-shaped body 100 and around the second compressible layer 64
  • the thread 102 is preferably cotton approximately 0.18 mm in diameter and the adjacent thread windings are spaced approximately 0.025 mm (0.001 inch) apart.
  • the thread 102 extends in a narrow spiral, in which the adjacent windings extend essentially perpendicular to the longitudinal axis of the sleeve-shaped rubber blanket 14.
  • the thread 102 has a longitudinal modulus of no less than 45,359 kg per 6.452 cm 2 (100,000 lbs per square inch), and in the preferred embodiment has a modulus of elasticity of approximately 381,016 kg per 6.452 cm 2 (840,000 lbs per square inch).
  • the elastic polymer of the seamless, tubular body 100 has a modulus of elasticity of approximately 245 kg per 6.452 cm 2 (540 lbs per square inch).
  • the thread 102 has a modulus of elasticity of not less than about 185 times the modulus of elasticity of the elastic polymer from which the seamless, sleeve-shaped body 100 is formed, and preferably a modulus of elasticity of about 1,555 times the modulus of elasticity of the elastic polymer.
  • the thread spiral 102 thus forms a circumferentially inextensible, sleeve-shaped lower layer, which prevents the sleeve-shaped body 100 from stretching circumferentially.
  • the thread 102 is included impregnated with the elastic polymer of the sleeve-shaped body 100.
  • the inextensible layer 66 could be formed from a seamless, sleeve-shaped body made of a rubber or urethane copolymer with a modulus of elasticity in the range of 454-2722 kg per 6.452 cm 2 (1,000-6,000 lbs per square inch) and no underlayer the thread 102 included. These materials are available under the trademark "Airthane” from Air Products and Chemicals, Inc.
  • the pressure layer 68 is a seamless and gap-free sleeve-shaped body with a smooth and gap-free cylindrical outer pressure surface 110. It is formed from a relatively soft, elastic polymer, such as rubber, which is a little compliant and which adheres to the sleeve-shaped rubber blanket 14 the gap 112 between the blanket cylinder 12 and the plate cylinder 20 (Fig. 1 and 4) can exert pressure. Since the print layer 68 is elastic and resilient, it is helpful to maintain a uniform pressure on the nip 112 in order to ensure a uniform transfer of the inked print image.
  • the print layer 68 preferably consists of the following composition: Parts 1.
  • the cylindrical outer printing surface 110 of the sleeve-shaped rubber blanket 14 moves through the nip 112 between the plate cylinder 20 and the rubber blanket cylinder 12, as shown in FIG. 4.
  • the flexible layers 62-68 of the tubular rubber blanket 14 are pressed in at the nip 112 by the rigid surface of the pressure plate 18.
  • the pressure layer 68 is not compressible, so it retains its original thickness as it moves through the nip 112.
  • the non-stretchable layer 66 is easily compressible due to the compressibility of the thread 102, so it is slightly compressed during the movement through the nip 112.
  • the non-stretchable layer 66 prevents the portion of the printing layer located in the printing nip from stretching more than 0.025 mm (0.001 inch) in the circumferential direction, and in fact, in the preferred embodiment, the portion of the printing layer in the printing nip stretches significantly less than 0.025 mm ( 0.001 inch).
  • the non-stretchable layer 66 also largely prevents the formation of standing waves in the printing layer 68 on both sides of the nip (see prior art FIG. 5). Such standing waves lead to smearing of the printing ink.
  • the first and second compressible layers 62 and 64 are both compressed at the nip 112. It is known that compressible parts of a rubber blanket become hot due to the continuous compression and regression in use. In the compressible layers 62 and 64, the cotton material has the compressible Threads 80 and 94 have less of a tendency to heat than the elastic polymer of sleeve-shaped bodies 74 and 90. Thus, the sleeve-shaped rubber blanket 14 according to the invention has little tendency to become overheated in use, since the compressible layers 62 and 64 are at least partially made of one material that stays cooler than the elastic polymer.
  • the pressure layer 68 and the elastic bodies 74, 90 and 100 of the layers 62, 64, 66 under the pressure layer 68 are endless bodies without gaps or seams. Furthermore, the spirally wound threads 80, 94 and 102 do not form any seams or gaps extending axially along the sleeve-shaped rubber blanket 14. Therefore, the cross-sectional shape of the tubular rubber blanket 14 moving through the nip 112 remains unchanged with each complete rotation of the rubber blanket cylinder 12. The pressure ratio between the outer pressure surface 110 and the pressure plate 18 also remains unchanged during the movement through the nip 112. The shocks and vibrations that occur in known rubber blankets with an axially extending gap are thus avoided, and a smooth transfer of the printed image is ensured.
  • the present invention further contemplates possible manufacturing processes for a tubular rubber blanket.
  • the chemlok 205 primer coating 71 is applied to the cleaned surface of the backing layer 60 and cured for about 30 minutes.
  • the second primer coating 72 made of Chemlok 220 is applied and cured for about 30 minutes.
  • the first compressible layer 62 is applied over the precoated backing layer 60 by embedding the thread 80 in the compressible rubber cement and the embedded thread 80 is wound spirally around the pre-coated carrier layer 60.
  • FIG. 3 the chemlok 205 primer coating 71 is applied to the cleaned surface of the backing layer 60 and cured for about 30 minutes.
  • the second primer coating 72 made of Chemlok 220 is applied and cured for about 30 minutes.
  • the first compressible layer 62 is applied over the precoated backing layer 60 by embedding the thread 80 in the compressible rubber cement and the embedded thread 80 is wound spirally around the pre-coated carrier layer 60.
  • the thread 80 is embedded in the rubber putty by pulling it during winding from a spool 22 around the carrier layer 60 through the rubber putty in a container 120.
  • An additional dose of rubber cement is then applied over the wound thread 80 as needed to form an additional thickness of the first compressible layer 62 in the area 126 shown in FIG. 3.
  • the first compressible layer 62 is then cured for two hours and oven dried for four hours at 60 ° C (140 ° F).
  • the second compressible layer 64 is formed in the same manner. If desired, additional windings of compressible thread may be applied to either or both of the compressible layers 62 and 64.
  • compressible materials other than the microspheres 76 and 92 could be used to form the cavities that impart compressibility to the sleeve-shaped bodies 74 and 90 in the compressible layers 62 and 64.
  • the cavities could be created by means of known methods by swelling and / or leaching after the sleeve-shaped bodies 74 and 90 have been built up over the carrier layer 60.
  • the inextensible layer 66 shown in FIG. 3 is formed in a similar manner by embedding the thread 102 in an elastic polymer without microspheres and winding it spirally around the second compressible layers 62 and 64.
  • the embedded thread 102 is preferably completely impregnated with the elastic polymer and wound under tension in order to apply a radially compressive preload to the compressible layers 62 and 64. Then the inextensible layer 66 is air dried for 15 minutes.
  • a layer of unvulcanized printing rubber 1 mm (0.040 inch) thick, is wrapped over the non-compressible layer 66 to form the printing layer 68.
  • This construction is wrapped with 5.72 cm (2.25 inches) nylon tape (not shown) and in a drying oven for four hours at approximately 100 ° C (200 ° F) and for four hours at approximately 150 ° C (292 ° F) cured.
  • the contiguous edges of the wrapped rubber layer are split, but combine during curing, so that the finished printing layer 68 has no axially extending seam.
  • the overlying bodies 74, 90 and 100 made of elastic polymer also bond during curing.
  • Layers 62-68 can then be identified by their various components as shown in Figure 4, but they are not separate from one another.
  • the elastic polymers of layers 62-68 form a single, endless and seamless sleeve-shaped body made of elastic polymer after curing. Because the inextensible layer 66 is also compressible, layers 62-66 effectively form a composite compressible layer having a lower portion containing compressible thread and microspheres and an upper portion containing compressible thread without microspheres.
  • the nylon tape is removed and the print layer 68 is sanded to a thickness of about 0.3 mm to 0.5 mm (0.013-0.020 inch) and processed to create a smooth, endless outer print surface 110.
  • FIG. 7 shows an alternative embodiment of a compressible layer for the tubular rubber blanket according to the invention.
  • the compressible layer 150 in FIG. 7 consists of a seamless, sleeve-shaped body 152 made of elastic polymer, microspheres 154 and ground cotton fibers 156.
  • the microspheres 154 and the ground cotton fibers 156 are evenly distributed in the sleeve-shaped body 152 in order to compress the layer 150 to lend.
  • the voids formed by microspheres 154 and / or fibers 156 could be created by the alternative methods described above. How about the If threads 80 and 94 are in the compressible layer 62 and 64 described above, the ground cotton fibers 156 have a relatively low tendency to become overheated by the repeated compression at the nip between a blanket cylinder and a plate cylinder.
  • 8A and 8B schematically illustrate methods of applying a compressible layer 150 of a measured thickness over the precoated carrier layer 60 by metering a rubber cement mixture with a metering roller 158 and a doctor blade 160.
  • 8C schematically illustrates a method in which the compressible layer 150 is applied by spraying a rubber cement mixture in a measured thickness over the precoated carrier layer 60.
  • the pressure layer 68 could alternatively be formed by a metering process or by spraying the elastic polymer, and / or the compressible layers 62, 64 and 150 could alternatively be formed by wrapping calendered layers, with the open edges not forming an axial seam after curing .
  • FIG. 9A and 9B illustrate another alternative embodiment of a compressible layer for the sleeve-shaped rubber blanket according to the invention.
  • a compressible layer 170 is shaped as a seamless cylindrical casting.
  • the compressible layer 170 is made of the same material as the compressible layer 150 described above and has an inner diameter which is not greater than the outer diameter of the support layer 60.
  • the compressible layer 170 is radially stretched, as shown in Fig. 9B, it can these are pushed telescopically over the carrier layer 60. Then the compressible layer 170 can contract and is thus installed in a state of radial and circumferential tension.
  • FIG. 10 is a schematic representation of an alternative embodiment of a circumferentially inextensible lower layer of the sleeve-shaped rubber blanket according to the invention.
  • the thread 102 is inextensible in the longitudinal direction woven to form a sleeve 200 that can be telescopically slid over the compressible layers 62 and 64 as shown in FIG. 3.
  • the pattern of woven thread 102 does not allow axial or radial expansion of the sleeve 200.
  • elastic polymer is applied to a shallow depth over a second compressible layer 64 and the sleeve 200 then becomes telescopic slid over the elastic polymer and the second compressible layer 64.
  • Additional elastic polymer is applied to the sleeve 200 as needed to embed and saturate the thread 102 therein and to achieve the desired thickness of the complete inextensible layer.
  • the thread 102 can be shrunk by the application of heat.
  • the shrunk sleeve 200 would be in circumferential and axial tension and would apply a compressive preload to the compressible layers 62 and 64 below.
  • FIG. 11A and 11B are schematic representations of a further alternative embodiment of a circumferentially inextensible lower layer of the sleeve-shaped rubber blanket according to the invention.
  • the longitudinally inextensible thread 102 is knitted into a sleeve 210 which can be telescopically pushed over the compressible layers 62 and 64, as shown in FIG. 3.
  • the pattern of the knitted thread 102 allows the sleeve 210 to be axially extended, the diameter of which is reduced, as indicated in FIG. 11B.
  • an elastic polymer is applied at a shallow depth over the second compressible layer 64 and the sleeve 210 is telescopically pushed over the elastic polymer and the compressible layer 64.
  • the sleeve 210 is then axially extended and their Diameter decreases.
  • the elongated sleeve 210 is in circumferential and axial tension and acts on the compressible layers 62 and 64 underneath with a radially compressive preload.
  • Additional elastic polymer is applied to the elongated sleeve 210 to impregnate the thread 102 and achieve the desired thickness of the complete, inextensible layer.
  • the elastic polymer forms a seamless, sleeve-shaped body in which the elongated sleeve 210 is embedded.
  • FIG. 12 is a sectional view of a further alternative embodiment of a circumferentially non-stretchable lower layer of the sleeve-shaped rubber blanket according to the invention.
  • an endless piece of plastic film 230 spirally extends through the elastic polymer 232 of an inextensible layer and around a compressible layer 234.
  • the film 230 is preferably of a width approximately equal to the length of the tubular rubber blanket and one Thickness of only 0.03 mm (0.001 inch) so that the narrow seam of the top layer formed by the 0.03 mm wide edge 236 does not break through the smooth, endless outer contour of an overlying printing layer.
  • a sleeve-shaped blanket 250 is comprised of a relatively rigid backing, a pair of seamless sleeve-shaped, microspherical rubber kit layers 254 and 256, and a pair of sleeve-shaped, compressible fabric layers 258 and 260.
  • the compressible fabric layers 258 and 260 are preferably woven or knitted sleeves as shown in Figs. 10, 11A and 11B.
  • the upper compressible fabric layer 260 is best described as one circumferentially inextensible sleeve attached so that it forms an inextensible layer of the sleeve-shaped rubber blanket 250. With the help of an intermediate layer 262 made of ordinary rubber cement, a sleeve-shaped pressure layer 264 is connected to the upper compressible fabric layer 260.

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Claims (42)

  1. Blanchet (14) en forme de manchon pour un cylindre porte-blanchet (12) dans une machine à imprimer offset (10), qui comprend :
    - un manchon cylindrique (70) qu'on peut enfiler axialement sur un cylindre porte-blanchet (10);
    - une couche compressible (62) recouvrant le manchon (70), la couche compressible (62) présentant un premier corps en forme de manchon sans joint (74) en matière élastique et possédant une pluralité de cavités (76, 92, 154) ; et
    - une couche inextensible (66) recouvrant la couche compressible (62), la couche inextensible (66) présentant un deuxième corps en forme de manchon (100) en matière élastique et une sous-couche en forme de manchon (102) en matière inextensible dans la direction circonférentielle, servant à imposer aux couches (62, 64) une précontrainte de compression agissant dans la direction radiale.
  2. Blanchet selon la revendication 1,
    caractérisé
    en ce que les cavités précitées contenues dans le premier corps en forme de manchon sans joint (74), en matière élastique, comprennent une pluralité de micropores qui sont répartis uniformément dans ledit premier corps en forme de manchon sans joint (74) en matière élastique.
  3. Blanchet selon la revendication 2,
    caractérisé
    en ce que lesdits micropores sont formés par des microsphères (76, 92, 154) qui sont réparties uniformément dans ledit premier corps en forme de manchon sans joint (74) en matière élastique.
  4. Blanchet selon la revendication 1,
    caractérisé
    en ce que lesdites cavités dudit premier corps en forme de manchon sans joint (74) en matière élastique sont formées de morceaux de fils compressibles qui sont disposés dans ledit premier corps (74) en forme de manchon sans joint en matière élastique.
  5. Blanchet selon la revendication 1,
    caractérisé
    en ce que ledit manchon (70) peut être dilaté élastiquement dans la direction radiale pour le montage dudit blanchet (14) sur un cylindre porte-blanchet (12).
  6. Blanchet selon la revendication 1,
    caractérisé
    en ce que lesdites cavités contenues dans ladite couche compressible (62) comprennent une pluralité de micropores qui sont définis par une pluralité de microsphères (76, 92, 154) disposées dans ledit premier corps en forme de manchon sans joint (74) en matière élastique,
    - ladite couche compressible (62) comprenant en supplément une matière fibreuse compressible (80) contenue dans ledit premier corps en forme de manchon sans joint (74) en matière élastique,
    - ladite matière fibreuse compressible (80) étant imprégnée par ladite matière élastique et par lesdites microsphères (76, 92, 154).
  7. Blanchet selon la revendication 6,
    caractérisé
    en ce que ladite matière fibreuse compressible (80) comprend des fibres de coton qui sont réparties dans ledit premier corps (74) en matière élastique.
  8. Blanchet selon la revendication 6,
    caractérisé
    en ce que ladite matière fibreuse compressible (80) est composée d'un fil qui s'étend en hélice autour dudit manchon (70).
  9. Blanchet selon la revendication 1,
    caractérisé
    en ce que ladite couche compressible (62) exerce sur ledit manchon (70) une précontrainte de compression agissant dans la direction radiale.
  10. Blanchet selon la revendication 1,
    caractérisé
    en ce que ladite sous-couche (102) en forme de manchon fait d'une matière (102) inextensible dans la direction circonférentielle comprend un fil (102) inextensible dans la direction longitudinale, qui s'étend en hélice à travers ledit deuxième corps en forme de manchon sans joint (100) en matière élastique et s'étend autour de ladite couche compressible (62).
  11. Blanchet selon la revendication 10,
    caractérisé
    en ce que les segments adjacents dudit fil (102) qui s'étendent dans la direction circonférentielle, s'étendent dans des directions qui sont sensiblement perpendiculaires à l'axe dudit manchon (70).
  12. Blanchet selon la revendication 11,
    caractérisé
    en ce que ledit fil (102) exerce sur ladite couche compressible (62) une précontrainte de compression agissant dans la direction radiale.
  13. Blanchet selon la revendication 12,
    caractérisé
    en ce que ledit fil (102) est imprégné de la matière élastique dudit corps (100) en forme de manchon.
  14. Blanchet selon la revendication 1,
    caractérisé
    en ce que la couche inextensible (66) exerce sur ladite couche compressible (62) une précontrainte de compression dans la direction radiale, et présente un module d'élasticité d'au moins 6,9 x 108 Pa (100 000 livres par pouce carré).
  15. Blanchet selon la revendication 14,
    caractérisé
    en ce que ladite sous-couche en forme de manchon (102), faite d'une matière inextensible dans la direction circonférentielle, comprend un manchon sans joint (200), fait de fils tissés (102), précontraint dans la direction circonférentielle et dans la direction axiale.
  16. Blanchet selon la revendication 14,
    caractérisé
    en ce que ladite sous-couche en forme de manchon (102), faite d'une matière inextensible dans la direction circonférentielle, comprend un manchon sans joint (210), fait de fils tricotés (102), précontraint dans la direction circonférentielle et dans la direction axiale.
  17. Blanchet selon la revendication 1,
    caractérisé
    en ce que ladite sous-couche en forme de manchon (102), faite d'une matière inextensible dans la direction circonférentielle, comprend des couches superposées de film en matière plastique (230).
  18. Blanchet selon la revendication 17,
    caractérisé
    en ce que lesdites couches superposées faites d'un film de matière plastique (200) sont des segments adjacents d'un morceau continu d'un film de matière plastique (230) qui est enroulé en hélice autour de ladite couche compressible (62).
  19. Blanchet selon la revendication 18,
    caractérisé
    en ce que ledit film de matière plastique (230) possède une épaisseur d'environ 0,025 mm.
  20. Blanchet en forme de manchon (14) selon la revendication 1, comprenant
    - un manchon cylindrique (70) qu'on peut enfiler dans la direction axiale sur un cylindre porte-blanchet (12),
    - une couche compressible (62) recouvrant sur le manchon (70), la couche compressible ((62) présentant un premier corps en forme de manchon sans joint (74) en matière élastique qui possède une pluralité de cavités (76, 92, 154) ; et
    - une couche inextensible (66) recouvrant la couche compressible (62), la couche inextensible (66) comprenant un deuxième corps en forme de manchon sans joint (100) en matière élastique ; et
    - une couche de compression en forme de manchon sans joint (68), recouvrant la couche inextensible (66), la couche de compression (68) présentant une surface de compression cylindrique, continue, dépourvue de fente.
  21. Blanchet selon la revendication 20,
    caractérisé
    en ce que ledit deuxième corps en forme de manchon sans joint (100) en matière élastique présente un module d'élasticité de 6,9 x 106 à 4,1 x 107 Pa (1 000 à 6 000 livres par pouce carré).
  22. Procédé de fabrication d'un blanchet en forme de manchon (14) pour un cylindre porte-blanchet (12) d'une machine à imprimer offset (10), qui comprend les phases suivantes consistant à :
    - former une première couche (62) dudit blanchet en forme de manchon (14) en déposant une première charge d'une matière élastique sous la forme d'un manchon cellulaire sans joint sur un manchon cylindrique (70) ; et
    - former une deuxième couche (66) dudit blanchet en forme de manchon (14) en déposant une deuxième charge d'une matière élastique sous la forme d'un manchon sans joint sur ladite première couche (62) ; et
    - noyer une matière inextensible dans la direction circonférentielle dans ladite deuxième charge de la matière élastique.
  23. Procédé selon la revendication 22, qui comprend les phases suivantes consistant à :
    - former une couche de compression (68) dudit blanchet en forme de manchon (14) en déposant une troisième charge d'une matière élastique sous la forme d'un manchon sans joint sur ladite deuxième couche (66) et
    - former une surface cylindrique continue sur ladite couche de compression (68).
  24. Procédé selon la revendication 22,
    caractérisé
    en ce que ladite première couche (62) dudit blanchet en forme de manchon (14) est formée
    - en noyant des microsphères compressibles (76, 92, 154) dans ladite première charge de matière élastique, pour former une matière cellulaire composite compressible, et
    - en déposant ladite matière cellulaire composite compressible en forme de manchon sans joint sur ledit manchon (70).
  25. Procédé selon la revendication 24,
    caractérisé
    en ce que ladite matière cellulaire composite compressible est formée en noyant une matière textile compressible (80) et lesdites microsphères (76, 92, 154) dans ladite première charge de la matière élastique.
  26. Procédé selon la revendication 24,
    caractérisé
    en ce que ladite matière cellulaire composite compressible est formée en enduisant un fil d'un tissu compressible d'un mélange de ladite première charge en matière élastique et de microsphères (76, 92, 154) et en enroulant ledit fil enduit en hélice en forme de manchon sans joint autour dudit manchon (70).
  27. Procédé selon la revendication 24,
    caractérisé
    en ce que ladite matière cellulaire composite compressible est formée en dispersant des fibres textiles compressibles (156) dans ladite première charge en matière élastique et en les déposant sous une épaisseur prédéterminée autour dudit manchon (70).
  28. Procédé selon la revendication 27,
    caractérisé
    en ce que ladite matière cellulaire composite compressible est déposée en une épaisseur prédéterminée autour dudit manchon (70) au moyen d'une raclette (160).
  29. Procédé selon la revendication 27,
    caractérisé
    en ce que ladite matière cellulaire composite compressible est déposée sur ledit manchon (70) en une épaisseur prédéterminée au moyen d'un rouleau doseur (158).
  30. Procédé selon la revendication 24,
    caractérisé en ce que
    - ladite matière cellulaire composite compressible est formée sous la forme d'une pièce coulée cylindrique sans joint (170) ayant un diamètre intérieur qui n'est pas plus grand que le diamètre extérieur dudit manchon (70), et
    - ladite pièce coulée (170) est montée sur ledit manchon (70) par dilatation radiale et enfilage dans la direction axiale.
  31. Procédé selon la revendication 24,
    caractérisé
    en ce que ladite deuxième couche est formée
    - en revêtant un fil (102) inextensible dans la direction longitudinale avec ladite deuxième charge de la matière élastique ; et
    - en enroulant ledit fil revêtu (102) en hélice autour de ladite première couche (62).
  32. Procédé selon la revendication 31,
    caractérisé
    en ce que les segments dudit fil (102) qui sont adjacents dans la direction circonférentielle sont enroulés de manière à s'étendre sensiblement perpendiculairement audit manchon (70).
  33. Procédé selon la revendication 22,
    caractérisé
    en ce que ladite deuxième couche (66) est formée :
    - en enfilant télescopiquement un manchon tricoté (210) fait d'un fil (102) inextensible dans la direction longitudinale, par dessus ladite première couche (102) ; et
    - en allongeant axialement ledit manchon tricoté (210), pour réduire son diamètre et pour exercer sur ladite première couche (62) une précontrainte de compression dans la direction radiale.
  34. Procédé selon la revendication 22,
    caractérisé
    en ce que ladite deuxième couche (66) est formée :
    - en enfilant télescopiquement un manchon tissé (200) fait d'un fil (102) inextensible dans la direction longitudinale par dessus ladite première couche (62) ; et
    - en rétractant ledit fil (102) pour réduire le diamètre dudit manchon tissé (200) et pour exercer sur ladite première couche (62) une précontrainte de compression dans la direction radiale.
  35. Blanchet en forme de manchon (14) selon la revendication 1, comprenant
    - une couche porteuse en forme de manchon élastique (60), pouvant être enfilée axialement par dessus un cylindre porte-blanchet (12),
    - une couche compressible (62) disposée au-dessus de la couche porteuse élastique en forme de manchon (60) et qui renferme un fil compressible (80), une pâte de caoutchouc (74) et des microsphères (76),
    - un corps en forme de manchon (100, 102), monté par dessus la couche porteuse (60) et la couche compressible (62) et comprenant un corps en forme de manchon sans joint (100) en matière élastique et une sous-couche en forme de manchon (102) en matière inextensible dans la direction circonférentielle, et
    - une couche de compression extérieure (68) sans joint et sans fente.
  36. Blanchet en forme de manchon (14) pour une machine à imprimer offset (10), selon la revendication 35, qui comprend :
    - une couche porteuse élastique en forme de manchon (60) pouvant être enfilée axialement par dessus un cylindre porte-blanchet (12) ;
    - une couche compressible (62, 64) qui est composée d'au moins une assise radiale située sur ladite couche porteuse (60) et faite d'un fil compressible noyé dans une pâte de caoutchouc (74) contenant des microsphères (76), ladite assise radiale de fil (80), d'une pâte en caoutchouc (74) et de microsphères (76) formant une couche continue (62)
    - une couche inextensible (66) qui comprend au moins une assise radiale adjacente, déposée sur la première couche sous-jacente et faite d'un fil inextensible (102) portant une pâte de caoutchouc (100) dépourvue de microsphères (76) ; et
    - une couche de compression extérieure (68) qui forme une surface latérale continue, dépourvue de fente.
  37. Blanchet en forme de manchon (14) selon la revendication 36, caractérisé en ce que la couche compressible (62-64) est composée d'au moins deux assises radiales de fil compressible (80, 94) noyé dans une pâte de caoutchouc (74, 90) contenant des microsphères (92).
  38. Blanchet en forme de manchon (14) selon la revendication 36, caractérisé en ce que le fil compressible (80, 94) est composé de coton.
  39. Blanchet en forme de manchon (14) selon la revendication 36, caractérisé en ce que la couche porteuse élastique en forme de manchon (60) est un cylindre de nickel (70).
  40. Blanchet en forme de manchon (14) selon la revendication 1,
    caractérisé
    en ce que la couche compressible est composée d'une paire de couches de pâte de caoutchouc en forme de manchon sans joint (254, 256) contenant des microsphères.
  41. Blanchet en forme de manchon (14), selon la revendication 1,
    caractérisé
    en ce que la couche inextensible est composée d'une paire de couches textiles compressibles en forme de manchon (258, 260).
  42. Blanchet en forme de manchon (14), selon la revendication 41,
    caractérisé
    en ce que la couche de base (260) compressible, en forme de manchon, la plus rapprochée d'une couche de compression en forme de manchon (264) est inextensible dans la direction circonférentielle.
EP92810364A 1991-05-14 1992-05-14 Blanchet d'impression tubulaire sans fente Expired - Lifetime EP0514344B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE9218764U DE9218764U1 (de) 1991-05-14 1992-05-14 Spaltfreies, hülsenförmiges Gummituch
EP95119776A EP0715966A1 (fr) 1991-05-14 1992-05-14 Blanchet d'impression tubulaire sans fente

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US69966891A 1991-05-14 1991-05-14
US699668 1991-05-14

Related Child Applications (1)

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EP95119776.3 Division-Into 1995-12-15

Publications (2)

Publication Number Publication Date
EP0514344A1 EP0514344A1 (fr) 1992-11-19
EP0514344B1 true EP0514344B1 (fr) 1997-11-05

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EP92810364A Expired - Lifetime EP0514344B1 (fr) 1991-05-14 1992-05-14 Blanchet d'impression tubulaire sans fente

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EP (2) EP0715966A1 (fr)
JP (2) JP2809554B2 (fr)
CA (1) CA2068629C (fr)
DE (2) DE9218764U1 (fr)

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EP0514344A1 (fr) 1992-11-19
US5304267A (en) 1994-04-19
CA2068629A1 (fr) 1992-11-15
JP2809554B2 (ja) 1998-10-08
JPH05301483A (ja) 1993-11-16
CA2068629C (fr) 1996-05-07
US5323702A (en) 1994-06-28
JP3135883B2 (ja) 2001-02-19
JPH10315654A (ja) 1998-12-02
DE59209001D1 (de) 1997-12-11
EP0715966A1 (fr) 1996-06-12
DE9218764U1 (de) 1995-06-14

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