EP0659585A1 - Blanchet d'impression à profil non-uniforme - Google Patents

Blanchet d'impression à profil non-uniforme Download PDF

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Publication number
EP0659585A1
EP0659585A1 EP94116700A EP94116700A EP0659585A1 EP 0659585 A1 EP0659585 A1 EP 0659585A1 EP 94116700 A EP94116700 A EP 94116700A EP 94116700 A EP94116700 A EP 94116700A EP 0659585 A1 EP0659585 A1 EP 0659585A1
Authority
EP
European Patent Office
Prior art keywords
blanket
profile
cylinder
rubber
construction
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.)
Granted
Application number
EP94116700A
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German (de)
English (en)
Other versions
EP0659585B1 (fr
Inventor
James B. Vrotacoe
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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 Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0659585A1 publication Critical patent/EP0659585A1/fr
Application granted granted Critical
Publication of EP0659585B1 publication Critical patent/EP0659585B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/193—Transfer cylinders; Offset cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F30/00—Devices for attaching coverings or make-ready devices; Guiding devices for coverings
    • B41F30/04—Devices for attaching coverings or make-ready devices; Guiding devices for coverings attaching to transfer cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N10/00—Blankets or like coverings; Coverings for wipers for intaglio printing
    • B41N10/02—Blanket structure
    • 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
    • B41N2210/02—Top layers

Definitions

  • the present invention has been created to solve problems that occur repeatedly in printing, in particular in offset printing.
  • a color sample is applied to sheet material in a printing unit by means of a rubber blanket stretched on a blanket cylinder.
  • the pattern is transferred from a plate cylinder to the blanket.
  • four such blankets and cylinders are usually actuated in four printing units in lithographic printing, namely one blanket / cylinder pair for each color to be printed and one for black.
  • the color images are created by printing the four patterns on top of each other.
  • the images formed in the individual printing units by the respective rubber blanket must be in register with respect to one another.
  • One cause of the deformation is the tendency of the web to take on moisture as it runs through the printing units.
  • the source of this moisture is the dampening solution supplied to the printing plate, which is used to cover those parts of the plate on which no color is desired, ie these parts become hydrophobic. It may be that the web absorbs so much moisture that "wide printing" in Appearance occurs, which means a lateral stretching of the web. Since this phenomenon of stretching occurs in each individual printing unit and can deteriorate from printing unit to printing unit, the geometry of the web is deformed and the web becomes increasingly wider as it runs through the printing press. This lateral deformation leads to the inaccurate registration of the images mentioned above.
  • a conventional solution to this problem is to create a compensating deformation in the web before it arrives at the blanket in the printing unit.
  • image controls have been used for this purpose.
  • the image controls are rotating wheels that press the width-reducing furrows into the web before it runs into the printing unit. After the web has stretched in width due to the absorption of moisture, this stretch is compensated for by the narrowing caused by the image regulator wheels and thus the register accuracy is favored.
  • the image regulator wheel can be seen as a solution for a very special type of deformation that occurs beneath the printing units.
  • a concave spreader roller is often used to smooth the wrinkled web laterally.
  • the web is usually built around a rigid steel roller a degree of curvature of approx. 90-180 ° and a concave profile. Movement of the web on a concave steel roller of this size causes the web to expand laterally.
  • a variant of the concave spreader roller is a cylindrical roller which is rotated about a curved axis of rotation.
  • Wrinkles can form in the printing nip of the blanket cylinder when the web moves over the blanket cylinder with an irregular speed profile prevailing along its printing nip. Due to the geometrical deformation that the web experiences when it moves over a cylinder and a rubber blanket, which are each somewhat deformable, the effective speed of the web varies along the linear extension of the pressure gap of the web Blanket cylinder with which it is moved. For example, the effect of cylinder lay-up and / or blanket stiffness and / or elasticity may be that the web moving through the nip acquires a varying speed profile, with the center of the web moving faster than the outside of the web, leading to wrinkling. This is an example of a problem that arises in a printing unit and should best be solved in the printing unit without smearing the printed image.
  • the object of the present invention is achieved by providing a blanket cylinder with a blanket which has a varying profile.
  • profile in this description means the presence of different blanket parameters that vary in the axial direction.
  • changes in the material properties in the axial direction are included, such as compressibility, rigidity and material thickness.
  • a concave thickness profile is effective to prevent wrinkling.
  • the concave profile will cause the speed at which the outer part of a path is moved to increase because the outer part of the concave profile has a larger effective radius (and thus one longer bow for has a given angular velocity) than the center of the concave profile, which has a smaller radius.
  • a rubber blanket with a suitable profile can be developed to obtain a speed profile which can prevent the formation of these wrinkles or smooth the existing wrinkles can. Only the basic principles of mechanics would have to be applied to determine the required speed profile, which has a corrective effect on the web. Furthermore, by overcompensating for a varying speed profile, in which the lateral parts of the web move faster than the central web part, lateral compressive forces can be generated on the web, which drag the web laterally, as is the case with spreader rolls. Such a specific design is superior to spreader roll technology because it can be used in the printing unit itself where spreader rolls cannot be used for the reasons mentioned above.
  • the present invention may be implemented in a number of different ways and in different ways Offset printing machines can be applied.
  • the present invention is shown in the accompanying drawings as being applied to a lithographic offset perfecting machine 10.
  • the lithographic printing machine 10 prints on both sides of a sheet of sheet material 12 and comprises identical upper and lower blanket cylinders 14 and 16.
  • the color patterns 18 and 20 located on the blanket cylinders 14 and 16 transfer color patterns to both sides of the web 12.
  • An upper and a lower plate cylinders 22 and 24 carry printing plates which are in rolling contact with the blankets 18 and 20 at the printing gaps 26 and 28.
  • color samples are transferred from the printing plates on the plate cylinders 22 and 24 to the blankets 18 and 20. These color samples are in turn transferred from the blankets 18 and 20 to both sides of the web 12.
  • the printing press comprises an upper and a lower dampening unit 30 and 32, from which dampening solution is supplied to the printing plates on the plate cylinders 22 and 24. Furthermore, ink is supplied from an upper and a lower inking unit 34 and 36 onto the printing plates on the plate cylinders 22 and 24.
  • a drive unit 38 shown schematically in FIG. 1, rotates the blanket cylinders 14 and 16 and the plate cylinders 22 and 24 at the same surface speed. The drive unit 38 also provides the power to drive the dampening units 30 and 32 and the inking units 34 and 36. It is conceivable that the printing press 10 could have a construction other than that shown here. For example, printing machine 10 could be designed to print only on one side of web 12.
  • the blanket itself is preferably made of a rubber-like material, namely nitrile, and it can be reinforced with fabric fibers.
  • the construction and composition of a rubber blanket is in the U.S. Patent Application No. 07 / 699,668 and also in U.S. Patents No. 3,700,541 (Shrimpton), No. 4,303,721 (Rodriguez) and No. 4,042,743 (Larson) are described in detail, and the content of these disclosures is incorporated in its entirety herein.
  • the blanket 18 illustrated in Fig. 5 is a composition of layers A, B, C and D.
  • Layer A is a reinforcing layer consisting of elastic textile fibers 1, e.g. Rayon threads partially in the surface of an elastic polymer composition 2, for. B. a mixture of nitrile rubber and polypropylene or nylon are embedded.
  • Layer B is a compressible layer consisting of an elastic microcellular polymer, e.g. B. a microcellular nitrile rubber that contains evenly distributed microcells in the form of embedded hollow micropores.
  • Layer C is a textile layer 3, consisting of a material with approx. 40 warp threads per cm, which are impregnated with a polymer composition 4.
  • the polymer composition can be the same as the printing surface, e.g. B. a nitrile rubber composition.
  • Layer D is a printing surface in the form of a veneer made of a solvent resistant elastomer, e.g. a nitrile rubber composition.
  • the rubber blanket 18 can be shaped with a curved, concave profile 19, as shown in FIGS. 2 and 3.
  • the lateral ends of the surface of the rubber blanket are radially further away from the axis of rotation of the rubber blanket cylinder 14 located underneath than locations in the center of the rubber blanket 18. This, in turn, creates a speed profile with which the lateral ends one through the pressure gap at the Blankets running web move faster with respect to the center of the web than would be the case with a conventional blanket with a cylindrical profile.
  • the concave profile can be created by applying a cylindrical rubber blanket to a convex mandrel and grinding the surface of the rubber blanket until it has a flat cylindrical profile with a constant diameter on the convex mandrel. It should be seen as being within the scope of this invention that this or a similar grinding operation can be performed on any of the plurality of layers making up the blanket. Other shapes can be created using mandrels with other shapes (e.g., grinding the blanket flat while it rests on a concave mandrel could create a convex blanket profile), or varying layers of material could be removed from the blanket .
  • a rubber blanket 18, 20 is obtained which, in use, has a uniform surface speed along the pressure nip 26, 28 through which the web runs and which prevents wrinkling in the web due to the varying speed profile.
  • a speed profile can be provided that creates a lateral load on the web 12 to compensate for other deformation-producing effects, whether they appear in front of the printing unit or in the printing unit, or are expected at a point below the printing unit.
  • Fig. 6 shows a rubber blanket
  • the profile 19 'does not vary in its thickness, but in its stiffness, compressibility or its coefficient of friction.
  • a profile that is stiffer at the ends of the rubber blanket than in the middle can be used to obtain a correctable speed profile along the pressure nip that works similarly to the varying concave thickness profile.
  • the speed along the roller depends on the effective radius, which varies according to the bending of the cylinder roller and also according to the compressibility or rigidity of the roller surface.
  • the compressibility or stiffness can be varied to vary the effective radius of the cylinder roll.
  • FIG. 7 and 8 demonstrate the further field of application of this invention by their representation of further exemplary embodiments.
  • the blanket 18, 20 has a convex profile 19 ''.
  • these and other forms could be used depending on the effect desired.
  • Fig. 8 shows that instead of changing the profile of the blanket, the profile 18 'of the underlying blanket cylinder 14, 16 can be modified.
  • a concave blanket cylinder 18 'with a flat blanket is used (in contrast to Fig. 2, where a blanket cylinder with constant diameter and concave profile is shown in the blanket).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Rotary Presses (AREA)
  • Soft Magnetic Materials (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Treatment Of Fiber Materials (AREA)
EP94116700A 1993-12-21 1994-10-22 Blanchet d'impression à profil non-uniforme Expired - Lifetime EP0659585B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US17095693A 1993-12-21 1993-12-21
US170956 1993-12-21

Publications (2)

Publication Number Publication Date
EP0659585A1 true EP0659585A1 (fr) 1995-06-28
EP0659585B1 EP0659585B1 (fr) 1999-08-11

Family

ID=22621971

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94116700A Expired - Lifetime EP0659585B1 (fr) 1993-12-21 1994-10-22 Blanchet d'impression à profil non-uniforme

Country Status (4)

Country Link
EP (1) EP0659585B1 (fr)
JP (1) JP3638326B2 (fr)
AT (1) ATE183144T1 (fr)
DE (2) DE4436973C2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6048387A (en) * 1997-10-07 2000-04-11 The Pilot Ink Co., Ltd. Reversible thermochromic composition
WO2005023690A1 (fr) * 2003-09-01 2005-03-17 Koenig & Bauer Aktiengesellschaft Procede pour reduire les erreurs de reperage sur une bande de matiere passant au niveau de la ligne de contact dans une rotative a bobines de plusieurs couleurs et dispositifs associes
EP1724114A2 (fr) 2005-05-19 2006-11-22 MAN Roland Druckmaschinen AG Machine d'impression rotative avec au moins un groupe d'impression
EP1894723A3 (fr) * 2006-08-29 2009-11-04 WIFAG Maschinenfabrik AG Arrangement de blanchets sur des cylindres d'une machine d'impression
US8393270B2 (en) 2003-07-11 2013-03-12 Goss International Americas, Inc. Printing blanket with convex carrier layer

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10257746B3 (de) 2002-12-10 2004-06-24 Man Roland Druckmaschinen Ag Formzylinder einer Rotationsdruckmaschine, insbesondere einer Offsetdruckmaschine
US6098540A (en) † 1998-08-10 2000-08-08 Heidelberger Druckmaschinen Ag Apparatus and method for reducing mottling in printing presses
FR2789347B1 (fr) * 1999-02-04 2001-04-06 Rollin Sa Blanchet a proprietes de surface variables pour machine a imprimer
DE10257745A1 (de) * 2002-12-10 2004-07-22 Man Roland Druckmaschinen Ag Gummizylinderhülse für Offset-Druckmaschinen
DE10258048A1 (de) * 2002-12-11 2004-06-24 Man Roland Druckmaschinen Ag Gummituchzylinder für Offset-Druckmaschinen
DE10335758C5 (de) 2003-08-05 2015-12-03 Manroland Web Systems Gmbh Verfahren und Druckwerk zur Beeinflussung der lateralen Bahnspreizung insbesondere an Rotationsdruckmaschinen
DE102004005893B4 (de) * 2003-10-08 2010-11-04 Koenig & Bauer Aktiengesellschaft Aufzüge für einen Zylinder einer Druckmaschine, Satz von Aufzügen sowie Verfahren zu deren Herstellung
DE10360013A1 (de) * 2003-12-19 2005-07-21 Man Roland Druckmaschinen Ag Walze, insbesondere Papierleitwalze für Rotationsdruckmaschinen
DE102004056389B4 (de) * 2004-09-16 2008-05-21 Koenig & Bauer Aktiengesellschaft Druckwerk einer Offsetdruckmaschine mit mindestens einem Formzylinder und einem Übertragungszylinder
DE202008017781U1 (de) * 2008-01-17 2010-07-08 Manroland Ag Druckwerk einer Druckmaschine und Übertragungsform
EP2384890B8 (fr) * 2010-05-07 2013-10-09 KBA-NotaSys SA Cylindre d'impression pour presse hélio et procédé correspondant

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH355786A (de) * 1958-01-24 1961-07-31 Winkler Fallert & Co Maschf Maschine zum Bedrucken von Papier und andern Stoffen in Bahnen mittels Tiefdruckwalzen
FR2157464A5 (fr) * 1971-10-16 1973-06-01 Maschf Augsburg Nuernberg Ag
DE3114580A1 (de) * 1981-04-10 1982-10-28 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach "vorrichtung zum ungleichmaessigen spannen des gummituches auf dem zylinder einer offsetdruckmaschine"
US4378737A (en) * 1981-06-01 1983-04-05 Robud Company Roller apparatus with replacement blanket
FR2550730A1 (fr) * 1983-08-15 1985-02-22 Wifag Maschf Rotative d'impression en offset a bobines
EP0194616A2 (fr) * 1985-03-14 1986-09-17 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Elément d'impression pour une rotative offset
JPH0592541A (ja) * 1991-10-02 1993-04-16 S P Kizai:Kk 凹版オフセツト印刷法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2660483C3 (de) * 1976-06-29 1982-03-18 Bosse, Rolf, Dr.-Ing., 4837 Verl Mehrschichtiges Drucktuch, insbesondere zum Offsetdrucken
JPS5943166U (ja) * 1982-09-13 1984-03-21 住友ゴム工業株式会社 オフセツト印刷機用ブランケツト
JPS6233444U (fr) * 1985-08-12 1987-02-27
GB8703158D0 (en) * 1987-02-10 1987-03-18 P & S Textiles Ltd Industrial fabrics
JPH05155172A (ja) * 1991-12-10 1993-06-22 Matsushita Electric Ind Co Ltd ブランケット
JPH06246896A (ja) * 1993-02-26 1994-09-06 Ryobi Ltd オフセット両面印刷機

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH355786A (de) * 1958-01-24 1961-07-31 Winkler Fallert & Co Maschf Maschine zum Bedrucken von Papier und andern Stoffen in Bahnen mittels Tiefdruckwalzen
FR2157464A5 (fr) * 1971-10-16 1973-06-01 Maschf Augsburg Nuernberg Ag
DE3114580A1 (de) * 1981-04-10 1982-10-28 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach "vorrichtung zum ungleichmaessigen spannen des gummituches auf dem zylinder einer offsetdruckmaschine"
US4378737A (en) * 1981-06-01 1983-04-05 Robud Company Roller apparatus with replacement blanket
FR2550730A1 (fr) * 1983-08-15 1985-02-22 Wifag Maschf Rotative d'impression en offset a bobines
EP0194616A2 (fr) * 1985-03-14 1986-09-17 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Elément d'impression pour une rotative offset
JPH0592541A (ja) * 1991-10-02 1993-04-16 S P Kizai:Kk 凹版オフセツト印刷法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 17, no. 430 (M - 1460) 10 August 1993 (1993-08-10) *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6048387A (en) * 1997-10-07 2000-04-11 The Pilot Ink Co., Ltd. Reversible thermochromic composition
US8393270B2 (en) 2003-07-11 2013-03-12 Goss International Americas, Inc. Printing blanket with convex carrier layer
EP1644201B2 (fr) † 2003-07-11 2016-07-06 Goss International Americas, Inc. Blanchet d'imprimerie a couche support convexe
WO2005023690A1 (fr) * 2003-09-01 2005-03-17 Koenig & Bauer Aktiengesellschaft Procede pour reduire les erreurs de reperage sur une bande de matiere passant au niveau de la ligne de contact dans une rotative a bobines de plusieurs couleurs et dispositifs associes
RU2343101C2 (ru) * 2003-09-01 2009-01-10 Кениг Унд Бауер Акциенгезельшафт Способ уменьшения погрешностей в приводке на полотне рулонного материала, движущемся через зону печатного контакта многокрасочной рулонной ротационной печатной машины, и устройства
US7497162B2 (en) 2003-09-01 2009-03-03 Koenig & Bauer Aktiengesellschaft Method for reducing register errors on a web of material moving through the printing nip of a multicolor web-fed rotary press and corresponding devices
EP1724114A2 (fr) 2005-05-19 2006-11-22 MAN Roland Druckmaschinen AG Machine d'impression rotative avec au moins un groupe d'impression
EP1724114A3 (fr) * 2005-05-19 2007-03-28 MAN Roland Druckmaschinen AG Machine d'impression rotative avec au moins un groupe d'impression
EP1894723A3 (fr) * 2006-08-29 2009-11-04 WIFAG Maschinenfabrik AG Arrangement de blanchets sur des cylindres d'une machine d'impression

Also Published As

Publication number Publication date
JPH07205566A (ja) 1995-08-08
DE59408612D1 (de) 1999-09-16
DE4436973A1 (de) 1995-06-22
EP0659585B1 (fr) 1999-08-11
ATE183144T1 (de) 1999-08-15
DE4436973C2 (de) 2003-06-26
JP3638326B2 (ja) 2005-04-13

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