US3676282A - Printing cloth - Google Patents

Printing cloth Download PDF

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Publication number
US3676282A
US3676282A US21238A US3676282DA US3676282A US 3676282 A US3676282 A US 3676282A US 21238 A US21238 A US 21238A US 3676282D A US3676282D A US 3676282DA US 3676282 A US3676282 A US 3676282A
Authority
US
United States
Prior art keywords
printing
layer
volume
thickness
cloths
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
US21238A
Other languages
English (en)
Inventor
Edmund Volmer
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.)
Continental AG
Original Assignee
Continental Gummi Werke 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
Priority claimed from DE19691914142 external-priority patent/DE1914142C/de
Application filed by Continental Gummi Werke AG filed Critical Continental Gummi Werke AG
Application granted granted Critical
Publication of US3676282A publication Critical patent/US3676282A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08L9/02—Copolymers with acrylonitrile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L21/00—Compositions of unspecified rubbers
    • 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
    • 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
    • B41N2210/06—Backcoats; Back layers; Bottom 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/02—Fibres or whiskers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L97/00—Compositions of lignin-containing materials
    • C08L97/007—Cork
    • 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
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
    • Y10T428/2495—Thickness [relative or absolute]
    • Y10T428/24967—Absolute thicknesses specified
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/30—Woven fabric [i.e., woven strand or strip material]
    • Y10T442/3008—Woven fabric has an elastic quality
    • Y10T442/3016—Including a preformed layer other than the elastic woven fabric [e.g., fabric or film or foil or sheet layer, etc.]
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/30—Woven fabric [i.e., woven strand or strip material]
    • Y10T442/3472—Woven fabric including an additional woven fabric layer
    • Y10T442/3602—Three or more distinct layers
    • Y10T442/3618—At least one layer contains wood or cork

Definitions

  • the present invention relates to printing cloths, which have an expansion resistant carrier layer, a volume compressible layer and a cover layer.
  • the cover layer of the printing cloth is intended for the dye transfer and with other printing methods takes care of the paper being uniformly pressed against the print carrier.
  • Printing cloths with a volume compressible intermediate layer are known per se and in this connection there exist two different types, namely printing cloths the microporosity of which consists of individual non-interconnected pores, and printing cloths the pores of which are interconnected by ne passages.
  • both types of printing cloths furnish satisfactory prints. If, however, it is desired to print upon products, such as envelopes, which have thickened portions, or if the feeding of the paper is disturbed in such a way that folded over or thickened corner portions are formed, the printing cloths of the first mentioned type will when relatively heavily thickened portions are involved be destroyed in a rather short time and will become non-usable, while the printing cloths with interconnected micropores do not recover fast enough and thus furnish faulty prints on the products which follow the respective disorder or disturbance. These cloths are, therefore, stopper proof or resistant to Stoppers only to a limited extent.
  • This insufficient stopper resistance can be explained as being caused by a larger amount of air escaping from the micropores which are compressed to a greater extent in the region of the stopper, through the ne passages between the individual micropores. When the pressure is relieved, the escaped air volume is, therefore, no longer available for furnishing sufficiently high returning forces.
  • FIG. 1 is a cross-section through a printing cloth according to the invention.
  • FIG. 2 shows the spring characteristic of two printing cloths respectively containing and 70 percent per volume of cork in the volume compressible layer and indicates the extent of compression in response to a pressure exerted upon the surface unit.
  • FIGS. 3 and 4 respectively illustrate by way of a graph the values for the deformations remaining in the different types of printing cloths, curves 1a and 1b representing the printing cloths according to the invention, curve 2 representing a printing cloth with isolated micropores in the volume compressible layer, curve 3 representing a printing cloth with volume compressible layer having intercommunicating micropores.
  • the bottom layer consists of one or more plies of fabric material having a high modulus of elasticity, said bottom layer having a total thickness not exceeding 0.7 mm.
  • the volume compressible layer comprises a rubber mixture with a high percentage of cork particles and has a thickness of at least 0.6 mm.
  • the highly elastic and abrasion and solvent resistant cover layer has a thickness of from 0.2 to 0.5 mm.
  • the volume compressible layer containing a high percentage of cork particles when exceeding a certain layer thickness of approximately 0.6 mm., does not only have a considerably increased stopper resistance manifested by a high returning power, but simultaneously also possesses a considerably increased life, even when being subjected to extreme loads.
  • This phenomenon can be explained theoretically only by assuming that the forces occurring during a printing operation in the volume compressible layer and causing a destruction are compensated for when exceeding a critical layer thickness and thus are no longer effective. This becomes apparent in the following comparison.
  • the volume compressible layer of which has a thickness of from 0.3 to 0.4 mm. cork particles are admixed in a proportion corresponding to the pore volume, there will be obtained a print of inferior quality, even though inferior to a very small degree, and a life span of the printing cloth which is reduced by half the usual life span.
  • the cork particles have an abrasive effect on the surrounding rubber layers in case layer thicknesses as mentioned above are involved.
  • the thickness of the intermediate layer is, at the expense of the strength of the bottom layer consisting of fabric, increased to values exceeding 0.65 mm., preferably to a value of about 1 mm., in addition to an increased life span of the volume compressible layer, there is simultaneously also obtained an improvement in the printed picture, in other words in the stopper resistance.
  • a printing cloth which has high recovery powers, i.e. a high stopper resistance and a surprisingly long life span.
  • the proportion of the cork particles in the volume compressible layer amounts preferably to from 70-180 percent by volume with respect to the rubber mixture. With a proportion of cork particles of less than 70 percent by volume, already a decrease in the recovery forces is noticeable, the upper limit being determined by the extent to which the cork particles can be mixed with the rubber mixture. The proportion of cork particles could still be increased, for instance, when employing rubber mixtures of low viscosity. However, experience has taught that in such an instance other undesirable properties will occur which means that the limit of 180 percent by volume of cork particles which can still be mixed with the rubber mixture, is to be considered the upper limit.
  • preferably synthetic rubbers may be employed which are resistant to solvents and oil, for instance, butadiene nitrile mixed polymerisates.
  • the highly elastic cover layer likewise consists of polymers resistant to oil and solvents and may be kept within4 conventional limits with respect to the structure of the mixture and of the thickness of the layer.
  • the cover layer may, as is well known, be provided with a rough surface by embedding therein glass or quartz splinters or pellets.
  • the printing cloth shown therein comprises a rubber layer 3 which is resistant to solvents, and fabric layers 1 and 2.
  • the fabric layers 1 and 2 which are connected to each other by the rubber layer 3 form the bottom layer which in the particular example has an overall thickness of 0.6 mm.
  • the fabric layer is built up of thin fibers having a high modulus of elasticity, said fibers consisting of regenerated cellulose.
  • the volume compressible intermediate layer 4 consists of a rubber mixture which is non-sensitive to oils and solvents on the basis of butadiene acrylic nitrile mixed polymerisates into which has been mixed in the specific example percent by volume of finely :ground cork particles.
  • the volume compressible layer has been deposited upon the bottom layer in a thickness of 0.9 mm. and has been covered by an oil and solvent resistant cover plate 6 having a thickness of 0.3 mm.
  • the spring characteristics of these two printing cloths are shown in FIG. 2.
  • the spring characteristics show the compressibility per surface unit when the cloth is subjected to a certain pressure.
  • the spring characteristic of the first printing cloth is represented by the curve 1a whereas the spring characteristic of the second printing cloth is represehted by the curve 1b. While in the case 1a a linear volume compressibility has been obtained, this holds no longer true in case 1b over a wide range.
  • FIGS. 3 and 4 give the values for the remaining deformations in the printing cloths 1a and 1b, for a printing cloth with a volume compressible layer 2 having isolated micropores, and for a printing cloth 3 with a volume compressible layer having intercommunicating micropores.
  • FIG. 3 shows the values for the static deformation. In a pinch-hardness-testing device there was measured the deformation which remained after one second and which was obtained by pressing a ball having a diameter of l0 mm. for two seconds against the printing cloth to obtain a certain starting deformation thereof.
  • FIG. 4 illustrates the remaining deformation as a function of the recovery period after being subjected to a dynamic load of 300,000 strokes in 18 hours with a compression of Ifrom 0.3 mm.i0.03 mm. per stroke with a punch of 1 om?.
  • Such load occurs in practice, for instance, when printing upon prefabricated envelopes.
  • the printing ycloth 3 after such load shows a remaining deformation of 0.15 mm. on the respective areas subjected to the load, which deformation after a recovery period of three hours decrease only to about half.
  • Such a high remaining deformation does no longer assure a uniform clear print.
  • the printing cloths 1a and 1b, 2 after having been subjected to the same load show a considerably lower remaining deformation.
  • the printing cloth 1a retains a trace of an impression of 0.04 mm., which is hardly visible with the naked eye and which after a certain time is reduced to half, i.e. to 0.02 mm.
  • the originally present impression of 0.08 mm. in the printing cloth 1b recovers very rapidly and already after two hours is reduced to the value of 0.02 mm., i.e. the value obtained with the printing cloth 1a.
  • the printing cloths 1a and 1b correspond as to their properties during the printing operation substantially to those of the printing cloth 2, whereas they are far superior to the printing cloth 3. Surprisingly it has been found that the life expectancy of the printing cloths 1a and 1b on the printing machines is about t-wice that of the printing cloths 2 and 3. In this connection it is to be understood that the printing cloth -3 will become nonusable due to the remaining deformations at a much faster rate although its structure has not yet been attacked.
  • a printing cloth especially for oiset printing, which consists of: a base layer of elastomeric carrier material having a maximum thickness of 0.7 mm. and comprising at least one fabric ply of liber material having a high modulus of elasticity, an intermediate volume compressible layer of elastomeric rubbery material having a thickness of at least 0.6 mm.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Printing Plates And Materials Therefor (AREA)
US21238A 1969-03-20 1970-03-20 Printing cloth Expired - Lifetime US3676282A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691914142 DE1914142C (de) 1969-03-20 Drucktuch

Publications (1)

Publication Number Publication Date
US3676282A true US3676282A (en) 1972-07-11

Family

ID=5728738

Family Applications (1)

Application Number Title Priority Date Filing Date
US21238A Expired - Lifetime US3676282A (en) 1969-03-20 1970-03-20 Printing cloth

Country Status (6)

Country Link
US (1) US3676282A (de)
AT (1) AT303087B (de)
BR (1) BR7017402D0 (de)
FR (1) FR2037908A5 (de)
GB (1) GB1274635A (de)
NL (1) NL7003860A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3819471A (en) * 1971-11-29 1974-06-25 Continental Gummi Werke Ag Printing blanket, especially for offset printing
US4042743A (en) * 1970-06-11 1977-08-16 Uniroyal, Inc. Compressible offset printing blanket
US4061818A (en) * 1976-10-07 1977-12-06 Dayco Corporation Printing blanket containing high strength filaments
US4112841A (en) * 1975-08-01 1978-09-12 Xerox Corporation Resilient lithographic masters for direct printing
US4303721A (en) * 1979-07-20 1981-12-01 W. R. Grace & Co. Closed cell foam printing blanket
US5034268A (en) * 1987-10-07 1991-07-23 Sumitomo Rubber Industries, Ltd. Offset blanket
US5628251A (en) * 1992-07-23 1997-05-13 O'bannion; William N. Printing press blanket underliner
US20080041256A1 (en) * 2006-08-17 2008-02-21 Day International, Inc. Printing blanket including a barrier layer

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4042743A (en) * 1970-06-11 1977-08-16 Uniroyal, Inc. Compressible offset printing blanket
US3819471A (en) * 1971-11-29 1974-06-25 Continental Gummi Werke Ag Printing blanket, especially for offset printing
US4112841A (en) * 1975-08-01 1978-09-12 Xerox Corporation Resilient lithographic masters for direct printing
US4061818A (en) * 1976-10-07 1977-12-06 Dayco Corporation Printing blanket containing high strength filaments
US4303721A (en) * 1979-07-20 1981-12-01 W. R. Grace & Co. Closed cell foam printing blanket
US5034268A (en) * 1987-10-07 1991-07-23 Sumitomo Rubber Industries, Ltd. Offset blanket
US5628251A (en) * 1992-07-23 1997-05-13 O'bannion; William N. Printing press blanket underliner
US20080041256A1 (en) * 2006-08-17 2008-02-21 Day International, Inc. Printing blanket including a barrier layer
EP2380733A1 (de) * 2006-08-17 2011-10-26 Day International, Inc. Drucktuch mit Sperrschicht

Also Published As

Publication number Publication date
NL7003860A (de) 1970-09-22
AT303087B (de) 1972-10-15
GB1274635A (en) 1972-05-17
BR7017402D0 (pt) 1973-02-27
FR2037908A5 (de) 1970-12-31
DE1914142A1 (de) 1970-10-01

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