EP2266796A1 - Manchon doté d'une protection de la face frontale - Google Patents

Manchon doté d'une protection de la face frontale Download PDF

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Publication number
EP2266796A1
EP2266796A1 EP09163366A EP09163366A EP2266796A1 EP 2266796 A1 EP2266796 A1 EP 2266796A1 EP 09163366 A EP09163366 A EP 09163366A EP 09163366 A EP09163366 A EP 09163366A EP 2266796 A1 EP2266796 A1 EP 2266796A1
Authority
EP
European Patent Office
Prior art keywords
section
sleeve
layer
printing
polymeric material
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.)
Withdrawn
Application number
EP09163366A
Other languages
German (de)
English (en)
Other versions
EP2266796A8 (fr
Inventor
Michael Kockentiedt
Christian Schnieders
Herbert Ahler
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.)
Rotec Hulsensysteme GmbH and Co KG
Original Assignee
Rotec Hulsensysteme GmbH and Co KG
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 Rotec Hulsensysteme GmbH and Co KG filed Critical Rotec Hulsensysteme GmbH and Co KG
Priority to EP09163366A priority Critical patent/EP2266796A1/fr
Priority to PCT/EP2010/058745 priority patent/WO2010149630A1/fr
Publication of EP2266796A1 publication Critical patent/EP2266796A1/fr
Publication of EP2266796A8 publication Critical patent/EP2266796A8/fr
Withdrawn legal-status Critical Current

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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
    • B41N6/00—Mounting boards; Sleeves Make-ready devices, e.g. underlays, overlays; Attaching by chemical means, e.g. vulcanising
    • 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
    • B41C1/182—Sleeves; Endless belts
    • 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
    • B41F27/10—Devices for attaching printing elements or formes to supports for attaching non-deformable curved printing formes to forme cylinders
    • B41F27/105—Devices for attaching printing elements or formes to supports for attaching non-deformable curved printing formes to forme cylinders for attaching cylindrical printing formes

Definitions

  • the present invention relates to a sleeve for application to a printing cylinder, which has a front side protection of a polymeric material, wherein the end protection is directly connected to the front side of the sleeve
  • the flexographic printing plates used can, in principle, be applied directly to the printing cylinder, for example by sticking them onto the printing cylinder with double-sided adhesive tape.
  • a sleeve is a cylindrical hollow body on which the printing plates are mounted, or which may also be completely covered with a print layer.
  • the sleeve technology allows a very quick and easy change of the printing form.
  • the inner diameter of the sleeves is almost equal to the outer diameter of the printing cylinder, so that the sleeves can be easily pushed over the printing cylinder of the printing press.
  • the up and down of the sleeves almost always works according to the principle of the air cushion:
  • the press is equipped with a special pressure cylinder, a so-called air cylinder.
  • the air cylinder has a compressed air connection on the front side, with which compressed air can be directed into the interior of the cylinder.
  • Modern sleeves usually have a multilayer structure. For example, be on US 6,703,095 B2 directed.
  • the base forms one with modern sleeves thin hollow cylindrical sleeve, usually made of glass fiber reinforced polyester, which may optionally also include a compressible layer. This is usually followed by one or more further layers of a polymeric material, for example of polyurethane or polyester.
  • the thickness of the polymer layer allows the outer diameter of the sleeve and thus the printing length to be controlled.
  • the printing cylinders usually have a male register element, for example a so-called register pin or another type of elevation on the outer surface of the printing cylinder.
  • the sleeves have on the inside a corresponding female register element, for example, a perforated tongue made of metal. The interaction of these two register elements ensures the correct positioning of the sleeve when pushed onto the printing cylinder.
  • the sleeves are not always pushed onto the printing cylinder in an angle-true manner.
  • the sleeves can be damaged by wear or bending, whereby the sleeves are finally unusable , Further, it has been recognized that by mounting or cleaning (or other maintenance work), the end face is physically and / or chemically affected, thereby reducing the life and degrading the print quality.
  • the object of the invention is to provide sleeves with an improved face protection.
  • the sleeve according to the invention for application to a printing cylinder comprises a section A in the form of a hollow cylinder with a cylinder jacket as (circumferential)
  • the sleeve comprises at least one base made of a polymeric material and at least one arranged on the outside of the base layer of a polymeric material.
  • the layer has an end face and the base has an end face.
  • the layer and the base each have two end faces, which lie at opposite ends of the section A.
  • the sleeve comprises at least one additional section B made of a polymeric material, which adjoins the end faces of at least one of the ends of section A in the direction of the longitudinal axis of the hollow cylinder at at least one of the ends of section A, the at least one section B is provided from a polymeric material and is materially bonded and without intermediate layers directly to the respective end face of section A.
  • the section B may be connected to both ends of the section A and thus to the respective two end faces of the layer and the base at each of the two ends, or may be attached to the two end faces of the layer and the base on the same side of the section A and at the same end of section A.
  • the section B extends radially at least partially along the end face of the base and at least partially along the layer. This radial extent refers to the longitudinal axis and the cylindrical shape of the cylinder jacket.
  • the sleeve according to the invention thus comprises, for the protection of the section A, a section B arranged directly on at least one end face of the section A, which protects the end face of the section A.
  • section B protects section A (especially its face (s)) from solvents used in cleaning the sleeve. Movement of section B moves (through the immediate connection of section B to the face of section A) of the entire sleeve to apply, remove or replace the sleeve in printing position.
  • the section B absorbs mechanical stresses and thus protects the more sensitive end side or one end of the section A. As a result, the print quality remains constant over time even with frequent use of the sleeve.
  • the invention therefore relates to a sleeve for application to a printing cylinder, which (at least) has a front side protection in the form of the section B of a polymeric material, wherein the end protection is directly connected to the end face of the sleeve.
  • the sleeve is thus subdivided into two sections in the longitudinal direction (ie in the axial direction and along the longitudinal axis), with one section A receiving mechanical pressure from one pressure plate and the other section (section B) for registering the sleeve and protecting it. This does not exclude that section B also partially or substantially fully absorbs mechanical pressure of a printing plate.
  • Section A may also be referred to as a pressure section according to one aspect of the invention.
  • Section A is arranged and intended to act as an abutment for a printing plate.
  • the entire section A is intended to act as an abutment for a section A embracing pressure plate, which itself is not part of the invention, but which can be mounted on the section A of the sleeve according to the invention.
  • only a portion of the section A is provided as an abutment for a rotating pressure plate, wherein, for example, an edge portion of the section A is not used as an abutment for a printing plate or provided for it.
  • the section A is (at least partially) arranged to serve either directly as an abutment when the pressure plate is applied directly to the sleeve, or to serve indirectly as an abutment when the sleeve according to the invention acts as an adapter (ie intermediate adapter) on which another Sleeve is wound, which in turn directly carries the pressure plate. Further, a part of the pressure plate may protrude over the portion A and thus cover a part of the portion B or the entire portion B directly or indirectly.
  • the section B may be referred to as a side protection section according to another aspect of the invention.
  • section B may not be intended to act as an abutment for a pressure plate, but may be configured to align the entire sleeve by transmitting a movement (eg, during assembly, ie when mounting the sleeve) to register.
  • a printing plate directly or indirectly covers part of the section B or substantially the entire section.
  • a printing plate can cover a part of the section B, in particular if the section B is made relatively wide, for example 2 -3 mm or even 10 - 20 mm or even more.
  • the section B has surface portions and / or surface features in the form of elevations or recesses into which an external registration device can engage or via which the registration device can move the sleeve according to the invention to this by movement register accurately. If the sleeve according to the invention directly serves as an abutment for a pressure plate via section A as described above, then no section of the pressure plate intended for printing covers section B or only an edge section of the pressure plate covers section B.
  • Section B is therefore not necessarily arranged However, in this case, to serve as a direct abutment for a printing plate and is not necessarily adapted to receive radial pressure during a printing operation, but may also be adapted to receive pressure of a printing plate or a peripheral portion thereof.
  • the sleeve of the invention over section A indirectly serves as an abutment for a printing plate and as described above represents a Adaptersleeve over which another sleeve is pulled (as an outer sleeve) with direct contact to a pressure plate as described above, then either no to pressure provided portion of the printing plate cover the portion B, or only an edge region of the pressure plate may cover a part of the portion B or substantially the entire portion B.
  • Substantially the entire portion B means substantially the entire axial length of the portion B or the entire axial length of the portion B except for an end portion of the portion B at a front end surface of the portion B.
  • covered (after the mounting of the pressure plate ) the printing plate substantially the section A and possibly only an edge portion of the printing plate covers the section B.
  • the further sleeve (as an outer sleeve) can cover the section B completely, partially or not. If, in the use of the invention, the further sleeve covers the section B, this can indeed exercise a pass pressure on the section B.
  • the section B is either not set up to receive a radial pressure of a pressure plate, or is set up to partially or completely absorb a radial pressure. If the sleeve is designed as an adapter, the section B may or may not be provided with radially extending air nozzles, whereas the section A is preferably designed for (indirectly or directly) receiving pressure plates with radially extending air nozzles.
  • section B Another important feature of section B is the covering and fixing of the end faces of one end of section A or both ends of section A.
  • Section B covers at least part of the face of the base and at least part of the face of the layer lying on the base is trained. This cover may be complete or partial for the base, for the layer, or for both.
  • the portion B may cover the end faces of the base and the layer of one end of the portion laterally (ie, in the axial direction), or may laterally cover the end faces of the base and the layer at both ends of the portion. Therefore, the ends of the section A of section B are protected and receive mechanical stabilization.
  • the section B protects the end faces or the ends of the section A against (in particular punctual) mechanical or also chemical stresses which occur during assembly, during replacement or during cleaning.
  • portion B the end face of the base is bonded to the face of the layer, the bond through portion B assisting adhesion within the portion A between the layer and base at the ends of portion A.
  • the stabilization reduces the sensitivity to forces such as impacts that can occur during registration or mounting.
  • the pressure sensitive portion A does not wear out or solvent is used during cleaning, as section B covers the section A in a protective way.
  • (entire) section B and the layer of section A are formed integrally, for example by casting, wherein substantially the entire section B and (only) the layer of section A are formed in the same casting step.
  • the layer of the section A and the section B are integrally formed.
  • the portion B is cast directly on the portion A (or vice versa) such that portion B and portion A (ie, the base and the layer formed thereon) are formed as two bodies having a common (radial ) Have cut surface, where they are connected to each other.
  • connection between section A and section B is provided by the direct contact of the two sections (without the use of an intermediate layer, eg an adhesive layer), wherein adhesion forces between these two bodies are formed by direct casting.
  • the one-piece design preferably relates to the section B and the section A, and in particular the section B and the end faces of the respective end of the section A.
  • the section B can be arranged on only one end side of the section A, or in two parts on both end sides of the section A, wherein at the end face of the section A at least partial areas of the base and at least partial areas of at least one layer of the at least one layer are designated.
  • one-sided i. In the case of a one-piece arrangement of section B, this concerns the end faces of the base and the layer of the same end of section A arranged thereon.
  • Two-part arrangement of the section B this concerns the respective end faces of the base and the layer disposed thereon at both ends of the section A.
  • the entire section A is intended to act as an abutment for a section A embracing pressure plate, which itself is not part of the invention, but which can be mounted on the section A of the sleeve according to the invention.
  • Section A is arranged to serve either directly as an abutment when the pressure plate is applied directly to the sleeve, or to serve indirectly as an abutment when the sleeve according to the invention acts as an adapter (ie intermediate adapter) onto which a further sleeve is mounted, which in turn immediately bears the printing plate.
  • only a part of the section A is provided as an abutment for a pressure plate, wherein, apart from this feature, the further embodiment of the first embodiment mentioned in this section is similar.
  • the section A preferably comprises a fiber-reinforced composite material.
  • the base of section A comprises fiber reinforced composite material, for example formed by fibers that are surrounded by plastic.
  • the section B can be provided only by cast material and without fiber reinforcement, as this does not absorb radial pressure exerted by a pressure plate, but preferably only torques (with a rotation axis parallel or identical to the longitudinal axis of the sleeve) receives and this passes on to the section A.
  • the portion B has a thickness (seen in the axial direction) with which a movement is transmitted to the section A and the entire sleeve.
  • section B may be made of a harder material than the layer in section A.
  • the thickness of section B is preferably greater than the thickness of the layer of section A (viewed radially) and / or preferably greater than the thickness of the base of section A. Section A (seen in radial direction).
  • the thickness of section B (viewed in the axial direction) is at least 1 mm at least 3 mm, at least 5 mm, at least 8 mm, at least 10 mm, at least 15 mm, at least 20 mm, at least 30 mm, at least 40 mm , or at least 50 mm.
  • the section A may be fiber-reinforced in the radial direction and the section B fiber-reinforced in the tangential direction.
  • the directions refer to the (circular) cylindrical shape of the sleeve.
  • the concept underlying the invention is to provide not only the portion A necessary for printing, but also at least one end face, in extension of the portion A, a portion B which adjoins the end face of the portion A directly.
  • immediate means in particular a physically contacting compound between sections A and B without the use of an intermediate layer.
  • an adhesive layer between both sections would also be considered as an intermediate layer.
  • the connection between sections A and B is obtained by direct injection of section B and section A, the material of section B flowing (ie not fully hardened or not fully solidified) directly onto section A (more precisely: on its front side) ) is poured. This is achieved by a casting mold, the inner surface of which comprises the relevant end face of the section A.
  • section A forms the bottom or part of the bottom of the mold used for section B.
  • the bond between Section A and Section B is a material bond, but without an intermediate layer such as an adhesive layer, and is particularly free of adhesives and solvents. This increases the life in use environments that use solvents.
  • section B can also be produced with a casting step, with which also section A (at least partially or its front side) is produced.
  • the connection between section A and section B is then provided by integrating both sections.
  • the at least one section B is connected by means of a connection with the respective end face of section A, which results from direct casting of the material of the section B to the respective end face of section A, or which is provided by integrally forming of section B with the respective face of section A or section A.
  • both end faces or only one end face of section A are directly connected to a section B.
  • the section B has the same cross-section or the same cross-sectional shape as the section A.
  • the section B may have a narrower cross section than the section A.
  • the portion B does not extend beyond the radial extent of the section A in the direction of the longitudinal axis of the sleeve and / or in the direction opposite thereto.
  • the portion B has an inner diameter (d 2 ) which corresponds to the inner diameter (d 1 ) of the section A or is greater than this.
  • the portion A of the sleeve may have a layer thickness equal to or greater than that of the portion B.
  • the portion B has a length along the longitudinal axis of the sleeve, which is 1 to 50 mm or 2 to 30 mm.
  • a further embodiment provides the section B with different (ie changing in the axial direction, ie in the direction of the longitudinal axis) inner cross-section, in particular with an abruptly changing inner cross section at the interface of two subsections of the section B, wherein the inner cross section within the subsections, however, preferably constant is.
  • the lower portion adjacent to one end of the sleeve has a smaller inner cross-section than the other lower portion to provide side surfaces for recording with registration means (eg, a registration ring) for portion B.
  • the section B is divided into a first and a second subsection, wherein the first subsection connects directly to the end face of the section A and the second section extends from the first subsection A to the section A away.
  • the first subsection has an inner diameter (d 2 ) which is larger than the inner diameter (d 5 ) of the second subsection.
  • the inner diameter may also have an inner cross-sectional area or the internal cross-sectional shape used to define the different dimensions of the subsections.
  • a further embodiment for registration purposes provides that the at least one section B has an end face, which is opposite to the end face of the section A relative to the section B, wherein the end face has at least one recess in which a ring is inserted, or the register recesses which are adapted to receive registration elements outside the sleeve.
  • Section B thereby serves as a mechanically (and chemically) resilient registration means complementary to external registering components outside the sleeve for angular registration of the sleeve, as well as protection against punctate impacts on the endface of the sleeve, or as protection against solvents during cleaning operations.
  • the embodiment shown for registration purposes can be characterized in that the recess and the ring is connected via a screw connection, gluing, non-positive connection or positive connection in the recess with the section B.
  • a screw in particular the section B in the recess on an internal thread and the ring has a screwed into the internal thread external thread.
  • the ring is a register ring and / or has on a facing away from the portion B surface recesses or surveys, which are set up for registration.
  • the ring may also have a smooth outer surface, i. be executed without physical, surface-related registration features and have, for example, only optical markers.
  • the sleeve according to the invention is characterized in that the polymeric material of the at least one section B and / or the polymeric material of the section A comprises an electrically conductive material.
  • the base of portion A may be formed of a fiber reinforced polymeric material formed as a continuous layer.
  • the fiber reinforced polymeric material may be formed as two layers between which a layer of compressible material extends. The thus provided compressible layer is preferably elastic to absorb the radial expansion during the assembly process.
  • the sleeve has a register element on at least one end on the inside of the at least one section B. In addition to registration by outer side surfaces of the section B and such inner register elements can be provided.
  • a production method is provided with which the sleeves according to the invention can be produced.
  • the manufacturing process is essentially based on extending the lengthening section B (or the lengthening section B) Sections B, when provided at both end faces of the section A), after forming the section A by forming the section B directly on the end faces physically abutment form. Portion B is thus "potted” onto section A, wherein section B is cast and an at least one end face of section A serves as the (partial) inner surface of the mold used to form section B (by a casting process).
  • the section B and the section A may also be provided in the same casting step.
  • the method according to the invention can be provided by first casting one of the two sections A or B as the first section, partially or completely curing this first section, and after the partial or complete curing, the other section B or A directly to the front side of the first section as second, subsequently infused.
  • Section A may be provided as the first section
  • Section B may be provided as the second section.
  • B may be provided as the first section
  • section A may be provided as the second section.
  • the section A can first be cast and at least partially hardened, whereupon a respective section B is cast on both end faces of the section A, preferably one after the other.
  • section B may first be cast and cured, then section A is cast thereon, whereupon a further section B is cast on the end face of section A directed away from already cast section B, after which section A is at least partially cured.
  • the inventive method for producing a sleeve according to the invention comprises, according to one embodiment, the steps of: providing the section A before forming the at least one section B; and forming the portion B immediately adjacent to the portion A by pouring the polymeric material of the portion B in the form of a curable, liquid polymeric mass or precursors thereof onto at least one of the two end faces of the portion A.
  • the forming comprises: providing a mold which an inner surface comprising at least one of the two end faces of the section A; and introducing the material of the section B into the mold.
  • the portion A is formed before the portion B or portion B is formed before the portion A.
  • both sections may be provided within the same casting step.
  • this comprises: providing the casting mold as a two-part mold with an annular collar and a cylindrical mandrel which is frontally provided with a lid with pouring opening.
  • the inner cross section of the section A is sealed by means of the mandrel which is inserted into the section A and whose cross section substantially corresponds to the inner cross section of the section A in order to seal the casting mold on an outer edge of the mandrel.
  • this embodiment provides: sealing side surfaces of the generating portion B by side sealing by means of the sleeve, which is sealingly arranged on one of the two end faces, wherein cuff, mandrel, cover and a portion of the portion A form the mold.
  • the mold is then closed by means of the lid and the polymer material of the section B in the form of the curable, liquid polymer mass is introduced through the pouring opening (10) into the mold.
  • the lid or other part of the mold has a vent hole through which air can escape during pressure to equalize the pressure.
  • the step is furthermore provided: smoothing of the outer surface of the section A and / or the section B by means of grinding after the formation of the section B.
  • At least one sleeve according to the invention is used for flexographic printing, letterpress printing, gravure printing or offset printing.
  • the layer provided in section A, which is arranged on the base can be provided by a layer or by a plurality of layers, of which at least one according to the invention directly abuts the portion B in the axial direction (ie in the longitudinal axis direction).
  • the thus provided at least one layer may be one or comprise a plurality of fiber reinforced layers, but preferably does not comprise a fiber reinforced layer.
  • the at least one layer may comprise an elastic intermediate layer disposed between the base and the outermost layers of the sleeve, for example of a foamed material or of a material which is substantially more elastic than the other layer (s) of the sleeve and / or or as the base.
  • sleeve in the form of a hollow cylinder, which can be applied in a conventional manner on printing machines with air cylinders.
  • adapter sleeves can, for example, themselves have an air connection, so that compressed air can flow into the interior of the Cylinder are passed and can emerge from there via arranged on the outside of the cylinder openings again. They are first pushed onto the printing cylinder like printing sleeves. Then the adapter sleeve itself can be supplied with air, whereby pressure sleeves can be pushed onto the adapter sleeve and fixed firmly on the adapter sleeve after switching off the air. Adapter sleeves increase the diameter of a printing cylinder.
  • the in Fig. 1 illustrated sleeve according to the invention has at least two sections A and B.
  • This is a hollow cylindrical section A, which is extended on one or both end sides of the section A with a section B or two bilateral sections B of a polymeric material along the longitudinal axis of the sleeve. If two sections B are present, they may be the same or different.
  • the hollow cylindrical section A is in principle a conventional sleeve known to the skilled person for application to printing cylinders. It comprises a hollow cylindrical base, which in turn can be constructed as a single-layered or multi-layered structure.
  • the hollow cylindrical base comprises at least one layer of a fiber-reinforced polymeric material.
  • the reinforcing fibers may preferably be glass fibers, aramid fibers, carbon fibers, metal fibers or ceramic fibers.
  • the polymeric material may be, for example, polyester resins, phenolic resins, vinyl ester resins or epoxy resins. They are preferably polyester resins.
  • the reinforcing fibers may for example be incorporated in the form of threads, woven or nonwoven fabrics.
  • For the preparation of the hollow cylindrical base is on the details in US 6,703,095 B2 , Column 3, line 30 to column 4, line 36, in particular column 4, lines 6 to 36 referenced.
  • the hollow cylindrical base further comprises at least one compressible layer which is applied on the outside of the layer of fiber-reinforced polymeric material.
  • the compressible layer may be a foam, for example a polyurethane foam.
  • the compressible layer facilitates the application of the sleeve on the impression cylinder. In this case, the compressible layer forms the outside of the sleeve.
  • the compressible layer is also referred to as elastic layer.
  • a further layer of the fiber-reinforced polymeric material described above can be applied to the outside of the compressible layer.
  • the hollow cylindrical base has, as seen from the inside, the layer sequence: (a) fiber-reinforced polymeric material - (b) compressible material - (c) fiber-reinforced polymeric material in this order. It is preferable that the fiber-reinforced polymeric material each with fiber-reinforced polyester.
  • further layers for example additional adhesive layers, can be present between these circulating layers.
  • the outer fiber-reinforced polymeric material, designated (c) above forms the outside of the sleeve.
  • the selection and thickness of the layers of the hollow cylindrical base is determined by the person skilled in the art, depending on the intended use of the sleeve.
  • the total thickness is usually 1 to 5 mm.
  • the three layers mentioned can each have, for example, a thickness of 1 to 2 mm. This information relates to the thickness in the radial direction, based on the cylinder shape of the sleeve.
  • the polymeric layer (s) depends on the intended use of the sleeve and is determined by the expert accordingly.
  • the layers can be hard or compressible layers, with the hardness of the layer depending on the desired application.
  • the polymeric materials are polyurethanes. For example, first a softer and then a harder layer of polyurethanes can be applied.
  • the thickness of the polymer layer (s) can be used to set the desired printing length by a person skilled in the art. Techniques for applying the polymeric layers are known in principle to the person skilled in the art.
  • the resulting sleeves can be ground in a manner known in principle in order to obtain a smooth surface of uniform diameter.
  • the length (in the direction of the longitudinal axis) of the section A is determined by the skilled person depending on the intended use of the sleeve. It is usually 200 mm to 4000 mm, preferably 400 mm to 2000 mm without the invention being limited to these values.
  • the inner diameter d 1 of the section A depends on the diameter of the printing cylinder, which can optionally be increased by bridge or adapter sleeves. It is usually 40 mm to 600 mm, preferably 70 mm to 350 mm, without the invention being limited to these values.
  • the total thickness of all layers of the hollow cylinder in section A together, ie the wall thickness is usually 4 to 160 mm, preferably 5 to 100 mm.
  • the hollow cylindrical section A is extended at one end face or at both end faces of the section A on one side with a section B or on both sides with a total of two sections B, in each case to one side, of a polymeric material, the section B (the sections B) is directly connected to the front of the section A (are).
  • the section B may be arranged in two separate sections on both end sides of the section A by means of the adhesion forces, or only a section B may be arranged on an end side of the section A by means of adhesion forces.
  • end face of the section A refers to the end faces of the base and at least one layer of the at least one layer formed on the base and relates to the plane in which the cut surface is located where the section A and section B abut, ie abut one end of section A.
  • the (or the) section (s) B are constructed of a polymeric material.
  • the polymeric materials of section B should typically have a higher impact resistance than the polymeric materials of section A.
  • the polymeric materials of Section B may be both uncrosslinked and crosslinked polymers.
  • the polymers can be used in pure form, but they can of course still contain conventional additives and additives, such as fillers. Preference is given to crosslinked polymeric materials.
  • Crosslinked polymers may on the one hand be elastomers.
  • Section B (at one or both ends of section A) of such materials have elastic properties. These are preferably those elastomers which can be obtained starting from crosslinkable, monomeric or oligomeric precursors. Examples of such elastomers include one-component or two-component silicone rubbers.
  • the polymer is a thermosetting polymer which is no longer deformable after curing.
  • the thermosetting polymers are obtained starting from crosslinkable, monomeric or oligomeric precursors. These are preferably precursors which already cure at room temperature, but the invention naturally also includes those products which cure only on heating or during irradiation. It can be both one-component systems as well Two-component systems act. Examples of such curable products include polyester resins, phenolic resins, vinyl ester resins, epoxy resins or polyurethane resins.
  • the polymeric materials are polyurethanes, which can be obtained in a manner known in principle by mixing suitable diol and isocyanate components.
  • the precursors comprise components which have at least three functional groups.
  • portion B joined to the face of portion A, if located at either end, or portion B, if provided only at one end, may be attached by using liquid liquid polymeric materials comprising sections B are constructed or their precursors, directly on at least one end face and solidifies the polymeric mass solidify.
  • the polymer can be used in molten form for casting.
  • the precursors for the respective polymeric materials can be cast on and then cured by crosslinking.
  • the end face of section A is therefore already before and during the curing process in direct contact with-depending on the polymeric material used-the precursors of the polymeric materials or with a molten polymer mass. This provides a firm bond between section A and section B at either or both ends of section A, without additional adhesive layers and mechanical fasteners. Details of the manufacture of the sleeves according to the invention are shown below.
  • Section B arranged on both sides of A are in the simplest case hollow-cylindrical sections which have the same inside diameter and outside diameter as section A.
  • Fig. 1 schematically shows an end of a sleeve according to the invention with a section A and the extending section B.
  • the length of the section B (if provided only at one end of the section A) or both parts of the section B is 1 to 50 mm, preferably 2 to 30 mm, relative to the longitudinal axis of the sleeve.
  • the section or sections B may also have deviating from the hollow cylindrical shape sections or constructive elements. But they are also at least in a first section, which adjoins the front side A also hollow cylindrical, in order to ensure the best possible connection of the sections A and B.
  • the section B On the opposite side surface of the section B, ie on a side surface of the section B facing away from the section A, the latter can have a polygonal shape in cross-section instead of a circular shape, so that edges of the polygon can serve as a registration component.
  • Other embodiments relate to a However, any or as described above shaped cross-section of the section B, however, have in or on the side surface non-rotationally symmetric physical features, for example in the form of polygonal shaped elevations or recesses that can be used for registration.
  • FIG. 2 an inventive sleeve is shown in longitudinal section.
  • the inner diameter d 2 of the portions B is not smaller due to the use in printing processes, as the inner diameter d 1 of section A, because the sleeve can otherwise no longer be properly pushed onto the printing cylinder and / or clamped.
  • the inner diameters d 1 and d 2 may be the same, wherein the sections A and B are stretched when pushed onto the air cylinder in the same manner through the air cushion.
  • the portion B is a hollow cylinder, but wherein the inner diameter d 2 is larger than the inner diameter d1.
  • the section B consists of very hard, thermosetting polymeric materials which can not be stretched as easily by the air cylinder as the section A.
  • an enlarged inner diameter d 2 in at least a portion of the section B is advantageous ensures a trouble-free sliding of the sleeve according to the invention on the printing cylinder. For this effect, it is usually sufficient if the inner diameter d 2 is only slightly larger than d 1 .
  • the inner diameter d 2 be 0.01 to 1 mm larger than the inner diameter d 1 , preferably 0.01 to 0.5 mm.
  • the outer diameter d 4 of the section B may be smaller than the outer diameter d 3 of section A, but preferably the d 3 and d 4 should be the same.
  • the difference (d 4 -d 2 ), ie the wall thickness in section B should not fall below 1 mm, preferably 2 mm and particularly preferably 4 mm.
  • FIG. 2 shown longitudinal section shows a sleeve according to the invention, which has a portion A as the central part.
  • Section A comprises a hollow cylindrical base 1 made of a fiber-reinforced polymeric material. Then a polymer layer 4 is applied. At both end faces of the central portion A is extended, each with a portion of the section B.
  • the inner diameter d 2 of section B is slightly larger than the inner diameter d 1 in section A.
  • Fig. 3 shows a longitudinal section through a sleeve with a three-layer hollow cylindrical base.
  • the innermost layer forms a layer 1 of a fiber-reinforced polymeric material.
  • a compressible layer 2 is arranged, and on this in turn a further layer 3 of a fiber-reinforced polymeric material.
  • a polymer layer 4 is arranged, and at both end faces is the Middle section A, each with a part of the section B extended.
  • the sleeve extends in the FIG. 3 (as in the FIG. 2 ) along the longitudinal axis L.
  • the sleeves with the section B according to the invention have a number of advantages over conventional sleeves.
  • section B the front sides of the section A are effectively protected against damage, such as from being hit by the register pin.
  • the end face is effectively protected from the ingress of solvents or solvent-containing vapors by the immediate attachment of the portion B to the front of A at one or both ends of the section A.
  • solvents may originate, for example, from printing inks or cleaning agents used and lead to swelling of the sections A, in particular the base of A. Only glued or screwed on end protection is not sufficient protection in terms of solvents or vapors.
  • Section B thus covers (at least in part) an end face of at least one end of section A and forms (in its extension) a sturdy face end face at the end (or ends) of the entire sleeve.
  • the term front end surface refers to the outwardly facing bottom / top surface of the entire sleeve, whereas the term end side designates the surfaces at the end of the section A, to which the section B immediately adjoins at least one end of the section A in the longitudinal direction to the outside.
  • electrically conductive elements are used, either by adding conductive materials in the base and / or in the (at least one) overlying layer, or by inserting a radially extending conductor.
  • a conductive component extends between the outermost layer (which is conductive) and the base.
  • base, layer and portion B of conductive materials are provided, eg. conductive plastic. Conductive elements are in electrical contact with base, layer, section B, or any combination thereof.
  • the present invention provides an elegant and simple problem solution by making sections B electrically conductive, thus requiring no additional conductive elements between the outermost layer and the base of the section. Instead, the desired electrical contact between (outermost) layer and base (which are self-conductive) results over the face of section A and the immediately adjacent electrically conductive section B.
  • Section B is complete, or at least directly on the face of section A. provided side provided with an electrical conductor, which are provided by a conductive plastic, from which the section B (at least partially) is provided.
  • portion B may have at the end faces of the base and the layer of the portion A a radially extending conductor connecting the base and the layer and of conductive Plastic or cast metal is provided.
  • Section B is preferably then rendered conductive in a manner as described above when the layer based on section A is multi-layered and comprises a non-conductive layer (e.g., a compressible layer) or when an adhesive bond between layer and base of section A is insufficient provides electrical contact.
  • a non-conductive layer e.g., a compressible layer
  • an electrically conductive, polymeric material for the sections B is used.
  • Electrical conductivity can be achieved, for example, by adding to the polymeric materials or precursors therefor electrically conductive materials such as conductive pigments. This achieves an electrically conductive connection between the base and the outside of the sleeve, especially in multi-layered structures. The installation of additional electrically conductive elements in the sleeve (in section A) can thus be avoided.
  • the inventive method the parts of the section B on both sides or the section B on one side has the additional advantage that even complicated shapes are relatively easy to produce. Of course, however, subsequent, mechanical processing is possible.
  • inventive technique also allows further components to be incorporated directly into the section B or into the parts of section B in one operation.
  • Such components may be, for example, register elements or recesses for receiving suitable register elements, functional rings, in particular register rings or even sensors.
  • identification features such as lettering or numbers can be provided.
  • a register element or a recess for receiving a register element can of course also be incorporated later, for example by milling.
  • the parts of the section B need not necessarily be hollow-cylindrical sections with a constant inner diameter over the entire length of the section B, but the diameter may vary over the length of the sections B (along the longitudinal axis L) or it may be on a hollow cylindrical portion follow an irregularly shaped portion. It should only be ensured that the minimum inner diameter d 2 of the parts of the section B is not smaller than the inner diameter d 1 of the section A and that the maximum outer diameter of the sections B is not greater than the outer diameter of the section A. By a Such a variant can be achieved further advantageous effects. The same applies to a one-sided training of Section B.
  • Fig. 4 shows a preferred embodiment of this variant. Shown is a longitudinal section through the end face of a sleeve according to the invention. At the front side of section A, first of all, a hollow cylindrical subsection 5 with an inner diameter d 2 adjoins. This is followed by another subsection 6 with an enlarged inner diameter d 5 .
  • the inner diameter d 2 should only be slightly larger than the inner diameter d 1 , for example 0.01 to 1 mm larger, preferably 0.01 to 0.5 mm larger. By this measure, the largest possible contact surface between sections A and B and thus ensures good adhesion.
  • the inner diameter d 5 can be significantly larger than the inner diameter d 1 .
  • the wall thickness in section 6 should not be less than about 2 mm. Viewed from the front side of such sleeves so have an annular recess in the front page.
  • a ring in Fig. 5 Reference numeral 7
  • the ring 7 may in particular have a register element, ie it is preferably a register ring. But it can also be a functional ring. It can be clamped in the recess, fastened with screws or glued.
  • the technique according to the invention, in which the parts of section B are cast, allows still further variants.
  • the recess shown can be provided with a thread, so that a ring 7, which has a corresponding mating thread, can be screwed into the recess of the section B at one or both ends of the section A.
  • the rings are interchangeable very quickly in this way. While the diameters of the printing cylinders are often standardized, so that sleeves of a certain inner diameter can also be used on printing cylinders of printing presses from different manufacturers, the register elements used by the respective manufacturers often differ significantly. To be able to use sleeves on different printing machines with different register elements, one can, for example, maintain a set of different rings with different register elements. If necessary, simply the matching ring 7 is screwed into Section B.
  • the ring 7 thus serves as a replaceable size adapter, wherein preferably all the rings of a group have the same dimensions for screw, with which they are attached to the section B, and different dimensions for adapting different sizes of external registration components.
  • the screw connection between ring and section B can be as in Fig. 5 be provided by a plurality of individual, non-concentric screw provided on a circular line whose center lies on the longitudinal axis.
  • the between Ring and Section B be a concentric screw, wherein the thread extends spirally around the longitudinal axis.
  • a conventional sleeve as described above can be used as section A.
  • the sleeve should have as smooth an outer surface as possible. If this is not already the case, the sleeve may optionally be ground prior to attaching section B or at least a portion of section B. In particular, before arranging the section B, the end face of the section A can be smoothed, for example by grinding.
  • Attachment of section B to section A may be accomplished by the casting of a liquid mass at section A using a suitable mold, as shown below.
  • a suitable mold as shown below.
  • the invention is not limited to the use of this technique.
  • the liquid mass may be, for example, a molten mass which hardens on cooling. It may also preferably be crosslinkable compositions which comprise monomeric and / or oligomeric precursors for the polymeric materials, and which thermally or photochemically crosslink after casting. Of course, crosslinkable molten masses can be used.
  • FIGS. 6 and 7 For sprueing the sections B to the section A, a suitable mold is used.
  • the principle is in the FIGS. 6 and 7 shown schematically.
  • FIG. 6 represents the production of hollow cylindrical parts of the section B of constant diameter
  • FIG. 7 the production of a part of section B with two different diameters.
  • a suitable mold is used to cast the sections.
  • the mold comprises a cylindrical mandrel 8, the outer diameter of which is dimensioned such that it completely fills at least part of the interior of section A.
  • the mold is closed by a lid 9, which is provided for pouring the liquid mass with one or more openings 10.
  • the lateral termination of the mold is by an annular, removable sleeve 11.
  • the sprue as shown in reference 10 in Figs Fig. 6 also shown in the cuff (not shown).
  • the mandrel 9 has the same diameter over the entire length.
  • connection between the lid and mandrel may be a permanent connection, or the lid 9 may be detachably connected to the mandrel 8, for example by a screw.
  • the mandrel points a second zone 12 having a larger outer diameter, see in particular Fig. 7 .
  • This variant has the advantage that the mandrel has a small step, and is seated with this step on the front side of section A.
  • the length of the sections B is fixed in an advantageous manner. If the section B should have two or more different inner diameter, the mandrel further sections each having different outer diameter (for example Fig. 7 ; Reference 13).
  • the mold Before casting, the mold is inserted with the mandrel 8 ahead in the section A, closed at the front side with the lid 9 and laterally with the sleeve 11.
  • the curable, liquid mass is poured and left until solidification or curing in the mold. After solidification or curing, the mold is removed.
  • Such precursors are generally used which cure after mixing at room temperature, but it is also possible to use resins which cure only on heating, for example in an oven, provided the temperature is not so high that section A could be damaged by heating.
  • the sleeve obtained can optionally be further treated. As a rule, it is recommended that the outer surface of the entire sleeve, i. to sharpen the sections A, B to obtain a flat surface.
  • the portion B of only one end of the sleeve may be ground or, if present, the portions B may be ground at both ends of the sleeve.
  • the sleeves according to the invention can, of course, also have further components beyond the section A and the section (s) B.
  • additional rings for example of metals or plastics can be applied or other functional elements, such as sensors.
  • the sleeves according to the invention can be used for example in flexographic printing, letterpress, gravure or offset printing.
  • the corresponding printing plates can be fastened in a manner known in principle to the sleeve with a double-sided adhesive tape.
  • the sleeves according to the invention can also be provided with a printing layer completely enveloping the surface.
  • the sleeves according to the invention are adapter sleeves, they can be used in a manner known in principle for increasing the diameter of printing cylinders.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Plates And Materials Therefor (AREA)
EP09163366A 2009-06-22 2009-06-22 Manchon doté d'une protection de la face frontale Withdrawn EP2266796A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP09163366A EP2266796A1 (fr) 2009-06-22 2009-06-22 Manchon doté d'une protection de la face frontale
PCT/EP2010/058745 WO2010149630A1 (fr) 2009-06-22 2010-06-21 Manchon avec protection du côté frontal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09163366A EP2266796A1 (fr) 2009-06-22 2009-06-22 Manchon doté d'une protection de la face frontale

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EP2266796A1 true EP2266796A1 (fr) 2010-12-29
EP2266796A8 EP2266796A8 (fr) 2011-04-06

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WO (1) WO2010149630A1 (fr)

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DE102011106886A1 (de) * 2011-07-07 2013-01-10 Manroland Web Systems Gmbh Druckwerkszylinder und hülsenförmiger Zylinderaufzug für einen Druckwerkszylinder

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20019625U1 (de) 2000-11-17 2001-04-05 Polywest Kunststofftechnik Saueressig & Partner GmbH & Co. KG, 48683 Ahaus Trägerhülse für Druckmaschinen
DE60000995T2 (de) * 1999-05-20 2003-11-13 Polyfibron Technologies S.A., Cernay Druckmaschinenzylinder mit indexierungsmitteln zum anbringen einer druckhülse an dem trägerzylinder
US6703095B2 (en) 2002-02-19 2004-03-09 Day International, Inc. Thin-walled reinforced sleeve with integral compressible layer
WO2006042637A2 (fr) 2004-10-20 2006-04-27 Windmöller & Hölscher Kg Cylindre pour plaque d'impression

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE60000995T2 (de) * 1999-05-20 2003-11-13 Polyfibron Technologies S.A., Cernay Druckmaschinenzylinder mit indexierungsmitteln zum anbringen einer druckhülse an dem trägerzylinder
DE20019625U1 (de) 2000-11-17 2001-04-05 Polywest Kunststofftechnik Saueressig & Partner GmbH & Co. KG, 48683 Ahaus Trägerhülse für Druckmaschinen
US6703095B2 (en) 2002-02-19 2004-03-09 Day International, Inc. Thin-walled reinforced sleeve with integral compressible layer
WO2006042637A2 (fr) 2004-10-20 2006-04-27 Windmöller & Hölscher Kg Cylindre pour plaque d'impression

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Technik des Flexodrucks", 1999, COATING VERLAG, pages: 73 FF

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WO2010149630A1 (fr) 2010-12-29

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