US20050158563A1 - Self-levelling under-packing for printing presses - Google Patents

Self-levelling under-packing for printing presses Download PDF

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Publication number
US20050158563A1
US20050158563A1 US10/827,355 US82735504A US2005158563A1 US 20050158563 A1 US20050158563 A1 US 20050158563A1 US 82735504 A US82735504 A US 82735504A US 2005158563 A1 US2005158563 A1 US 2005158563A1
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Prior art keywords
packing
under
layers
din
polyester
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US10/827,355
Inventor
Roberto Levi Abocas
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Printgraph Waterless SpA
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Printgraph Waterless SpA
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Application filed by Printgraph Waterless SpA filed Critical Printgraph Waterless SpA
Assigned to PRINTGRAPH WATERLESS S.R.L. reassignment PRINTGRAPH WATERLESS S.R.L. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LEVI ACOBAS, ROBERTO
Publication of US20050158563A1 publication Critical patent/US20050158563A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/14—Layered products comprising a layer of natural or synthetic rubber comprising synthetic rubber copolymers
    • 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
    • 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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
    • 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
    • B41F30/06—Devices for attaching coverings or make-ready devices; Guiding devices for coverings attaching of endless or like continuously-fed coverings
    • 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
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • B32B2307/3065—Flame resistant or retardant, fire resistant or retardant
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/51—Elastic
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/75—Printability
    • 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
    • Y10T428/14—Layer or component removable to expose adhesive
    • 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
    • Y10T428/14—Layer or component removable to expose adhesive
    • Y10T428/1452—Polymer derived only from ethylenically unsaturated monomer
    • 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
    • Y10T428/14—Layer or component removable to expose adhesive
    • Y10T428/1486—Ornamental, decorative, pattern, or indicia
    • 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.]
    • Y10T428/24777—Edge feature
    • 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.]
    • Y10T428/24777—Edge feature
    • Y10T428/24793—Comprising discontinuous or differential impregnation or bond
    • 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
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • 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
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y10T428/2848—Three or more layers
    • 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
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31551—Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31786—Of polyester [e.g., alkyd, etc.]

Definitions

  • the present invention relates to under-packing for printing presses, particularly offset.
  • the blanket cylinder With particular but non-exclusive reference to offset printing presses, these basically comprise three cylinders: the plate cylinder, the blanket cylinder covered with rubber-coated fabric, and the impression cylinder. Below the said covering, the blanket cylinder comprises traditional under-packing formed: from individually removable (incompressible) gauged paper sheets for adapting the working diameter of the cylinder, and a separate under-blanket generally consisting of elastically compressible polybutadiene.
  • An object of the present invention is to provide under-packing for printing presses which is able to satisfy a large series of requirements which the current art only partially satisfies; more precisely the under-packing of the invention is able to satisfy the following requirements: ecocompatibility, flame retardance, resistance to solvents and to mechanical stresses, excellent machinability, long life, considerable versatility of use, excellent adaptation to the cylinder and resilient elasticity, better constructional geometry of the point of printing, considerable screen spreading uniformity, better printing stability.
  • the under-packing of the invention (always indicated by 1) consists in its most general expression of a composite comprising a non-elastic part (defined as rigid for simplicity) indicated by 2 formed from a film based on high-limpidity polyester (PES) (for example transparent antinewton polyester, the term “antinewton” indicating that it has been slightly roughened by physical treatment to facilitate bonding to the other layer) as produced by POLICROM Inc., of Bensalem, Pa. (USA) and by Toray, Japan), and an elastomeric covering 3 (on one side of the PES film) based on polyurethane and/or thermoplastic polyurethane (for example the products known by the name Estane 54660 and 58271 of NOVEON Inc., USA).
  • PES high-limpidity polyester
  • the composite can present one or more strips of adhesive, or be completely adhesive-coated, with products of known type enabling facilitated attachment and detachment (pressure sensitive).
  • the adhesive for connection to the metal surface of a cylinder or of a “metal blanket”, the adhesive, as already stated, will involve the whole surface in question.
  • the adhesive is indicated by 4 in FIG. 1.
  • the composite can be obtained by known covering methods for producing composite film, for example by blade spreading, by calendering, by coextrusion or a combination of calendering and coextrusion.
  • the thickness of the applied elastomer can vary from a minimum of 20 ⁇ m up to 1000 ⁇ m (for each layer, with a maximum of three layers in the case of a composite with more than one layer inseparably joined together).
  • the thickness of the polyester based film can vary between 40-100 ⁇ m (with one side totally adhesive-coated and including not more than 5 ⁇ m of adhesive in its thickness) and between 50-350 ⁇ m (without adhesive coating) or with partial adhesive coating along an edge strip.
  • DMF dimethylformamide
  • the adhesive is of the kind known as attach/reattach known as pressure sensitive.
  • the chemical/physical characteristics of the polyurethane are the following: Shore hardness A 75-95 DIN 53505 Density g/cm 3 1.10-1.25 DIN 53479 Cyclic compression % 60% compressible DIN 53517 Resilience % 30-40 DIN 53512 Solvent resistance resistant
  • the test consisted of carrying out a cycle of one million compressions (of 60% on the compressible side) without undergoing any thickness decrease in 5 cm elastomeric discs subjected to 60% compressive load on the elastomer side with preload of 2N, cycle frequency 20 Hz.
  • Example 1 Using the calendering method, a polyester based film of 40 ⁇ m thickness is covered on one side with an elastomer layer (based on high solid polyurethane) of 160 ⁇ m thickness. Reference should be made to Example 1 for adhesive-coating details.
  • a 100 ⁇ m polyester based film is combined with a 100 ⁇ m film of elastomer based on thermoplastic polyurethane.
  • thermoplastic polyurethane A 625 ⁇ m elastomer layer based on thermoplastic polyurethane is applied by calendering to a 175 ⁇ m standard polyester based film.
  • the composite is formed from a 350 ⁇ m polyester based film and a 450 ⁇ m blade-spread layer of polyurethane based elastomer.
  • the composite is formed from a 500 ⁇ m polyester based film and a 1000 ⁇ m calendered layer of polyurethane based elastomer.
  • a 300 ⁇ m layer of polyurethane is applied (by blade-spreading) onto a first layer formed from a 175 ⁇ m polyester based film.
  • thermoplastic polyurethane of different characteristics, for example hardness.
  • a first composite—obtained by calendering is formed from a 175 ⁇ m film ( 2 a ) of polyester, and a 600 ⁇ m polyurethane elastomer layer ( 3 a )—is calendered on a second identical composite again formed from a 175 ⁇ m film ( 2 a ) of polyester, and a 600 ⁇ m polyurethane elastomer layer ( 3 a ).
  • the result represents a different requirement of the user which is satisfied with a simple combining of two identical composites, i.e. of the same composite.
  • a coextruded and calendered multi-layer composite formed from a 350 ⁇ m first polyester film ( 2 b ), a 600 ⁇ m layer of thermoplastic polyurethane elastomer ( 3 b ), a 50 ⁇ m second polyester film ( 2 b ) and a 550 ⁇ m second polyurethane elastomer layer ( 3 b ).
  • At least one 50 ⁇ m polyester film coated with pressure sensitive adhesive is applied to a composite comprising a 225 ⁇ m polyurethane film and a 175 ⁇ m polyester film.
  • pressure sensitive adhesive i.e. detach/reattach
  • a composite comprising a 225 ⁇ m polyurethane film and a 175 ⁇ m polyester film.
  • two or three can be used stacked individually and removable for thickness adaptation purposes.
  • the scope of the invention also includes traditional methods for combining several composites together to obtain a resultant composite of adequate thickness possessing the required chemical/physical characteristics.

Landscapes

  • Laminated Bodies (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Printing Methods (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)

Abstract

The self-levelling under-packing for printing presses, in particular offset presses, comprises at least one polyester-based layer and at least one polyurethane elastomer layer joined inseparably together.

Description

  • The present invention relates to under-packing for printing presses, particularly offset.
  • With particular but non-exclusive reference to offset printing presses, these basically comprise three cylinders: the plate cylinder, the blanket cylinder covered with rubber-coated fabric, and the impression cylinder. Below the said covering, the blanket cylinder comprises traditional under-packing formed: from individually removable (incompressible) gauged paper sheets for adapting the working diameter of the cylinder, and a separate under-blanket generally consisting of elastically compressible polybutadiene.
  • For levelling purposes, it is already known in the printing press sector to also use, as under-packing, polyester films coated with adhesive on one side. The drawback of using paper and polyester is that both are rigid (hence not properly self-levelling), the former also not being fire-retardant.
  • From another patent of the same applicant (European patent 1,323,527), it is already known to use as under-packing a series of sheets (of paper or polyurethane) joined together by known pressure sensitive adhesive which enables the individual sheets to be removed to adapt the under-packing (of rubber-coated fabric) to the required thickness.
  • An object of the present invention is to provide under-packing for printing presses which is able to satisfy a large series of requirements which the current art only partially satisfies; more precisely the under-packing of the invention is able to satisfy the following requirements: ecocompatibility, flame retardance, resistance to solvents and to mechanical stresses, excellent machinability, long life, considerable versatility of use, excellent adaptation to the cylinder and resilient elasticity, better constructional geometry of the point of printing, considerable screen spreading uniformity, better printing stability.
  • This and further objects which will be more apparent from the ensuing detailed description are attained by an under-packing for printing presses in accordance with the technical teachings of the accompanying claims.
  • The invention will be more apparent from the following detailed description, provided by way of non-limiting example, of some preferred embodiments thereof presented in the form of examples on the basis of the following schematic figures from 1 to 3, all showing sections through different versions of under-packing of the invention.
  • The under-packing of the invention (always indicated by 1) consists in its most general expression of a composite comprising a non-elastic part (defined as rigid for simplicity) indicated by 2 formed from a film based on high-limpidity polyester (PES) (for example transparent antinewton polyester, the term “antinewton” indicating that it has been slightly roughened by physical treatment to facilitate bonding to the other layer) as produced by POLICROM Inc., of Bensalem, Pa. (USA) and by Toray, Japan), and an elastomeric covering 3 (on one side of the PES film) based on polyurethane and/or thermoplastic polyurethane (for example the products known by the name Estane 54660 and 58271 of NOVEON Inc., USA).
  • On the opposite side to that with the elastomeric covering, the composite can present one or more strips of adhesive, or be completely adhesive-coated, with products of known type enabling facilitated attachment and detachment (pressure sensitive). For connection to the metal surface of a cylinder or of a “metal blanket”, the adhesive, as already stated, will involve the whole surface in question. The adhesive is indicated by 4 in FIG. 1.
  • The composite can be obtained by known covering methods for producing composite film, for example by blade spreading, by calendering, by coextrusion or a combination of calendering and coextrusion.
  • The thickness of the applied elastomer can vary from a minimum of 20 μm up to 1000 μm (for each layer, with a maximum of three layers in the case of a composite with more than one layer inseparably joined together).
  • The thickness of the polyester based film can vary between 40-100 μm (with one side totally adhesive-coated and including not more than 5 μm of adhesive in its thickness) and between 50-350 μm (without adhesive coating) or with partial adhesive coating along an edge strip.
  • The examples are as follows:
    • EXAMPLE 1
  • A polyester based film of 40 μm thickness totally adhesive-coated on one face (protected by a removable silicon-coated film) is covered on its non-adhesive side in known manner (blade spreading) with a 100 μm thickness of elastomer based on high solid polyurethane in DMF (dimethylformamide) solvent.
  • The adhesive is of the kind known as attach/reattach known as pressure sensitive.
  • In particular the chemical/physical characteristics of the polyurethane are the following:
    Shore hardness A 75-95 DIN 53505
    Density g/cm3 1.10-1.25 DIN 53479
    Cyclic compression % 60% compressible DIN 53517
    Resilience % 30-40 DIN 53512
    Solvent resistance resistant
  • The test consisted of carrying out a cycle of one million compressions (of 60% on the compressible side) without undergoing any thickness decrease in 5 cm elastomeric discs subjected to 60% compressive load on the elastomer side with preload of 2N, cycle frequency 20 Hz.
    • EXAMPLE 2
  • Using the calendering method, a polyester based film of 40 μm thickness is covered on one side with an elastomer layer (based on high solid polyurethane) of 160 μm thickness. Reference should be made to Example 1 for adhesive-coating details.
    • EXAMPLE 3
  • Using the known coextrusion method, a 100 μm polyester based film is combined with a 100 μm film of elastomer based on thermoplastic polyurethane.
    • EXAMPLE 4
  • A 625 μm elastomer layer based on thermoplastic polyurethane is applied by calendering to a 175 μm standard polyester based film.
    • EXAMPLE 5
  • The composite is formed from a 350 μm polyester based film and a 450 μm blade-spread layer of polyurethane based elastomer.
    • EXAMPLE 6
  • The composite is formed from a 500 μm polyester based film and a 1000 μm calendered layer of polyurethane based elastomer.
    • EXAMPLE 7
  • A 300 μm layer of polyurethane is applied (by blade-spreading) onto a first layer formed from a 175 μm polyester based film.
  • A 50 μm polyester based film is then applied (by calendering) to the polyurethane layer, followed (by calendering) by a 255 μm elastomer layer (thermoplastic polyurethane), then finally by a 20 μm layer of thermoplastic polyurethane of different characteristics, for example hardness.
    • EXAMPLE 8 Figure 2
  • A first composite—obtained by calendering is formed from a 175 μm film (2 a) of polyester, and a 600 μm polyurethane elastomer layer (3 a)—is calendered on a second identical composite again formed from a 175 μm film (2 a) of polyester, and a 600 μm polyurethane elastomer layer (3 a). The result represents a different requirement of the user which is satisfied with a simple combining of two identical composites, i.e. of the same composite.
    • EXAMPLE 9 Figure 3
  • A coextruded and calendered multi-layer composite formed from a 350 μm first polyester film (2 b), a 600 μm layer of thermoplastic polyurethane elastomer (3 b), a 50 μm second polyester film (2 b) and a 550 μm second polyurethane elastomer layer (3 b).
    • EXAMPLE 10
  • At least one 50 μm polyester film coated with pressure sensitive adhesive (i.e. detach/reattach) is applied to a composite comprising a 225 μm polyurethane film and a 175 μm polyester film. Instead of one adhesive-coated film, two or three can be used stacked individually and removable for thickness adaptation purposes.
  • The scope of the invention also includes traditional methods for combining several composites together to obtain a resultant composite of adequate thickness possessing the required chemical/physical characteristics.

Claims (20)

1. Self-levelling under-packing for printing presses, comprising at least one polyester-based layer and at least one polyurethane elastomer layer joined inseparably together.
2. Under-packing as claimed in claim 1, wherein the polyester-based layer is between 50 μm and 350 μm and the polyurethane elastomer layer is between 20 μm and 1000 μm.
3. Under-packing as claimed in claim 1, wherein the polyester-based layer is adhesive-coated on one side, in which case the thickness, including the adhesive, is between 40 and 100 μm, the adhesive thickness not exceeding about 5 μm.
4. Under-packing as claimed in claim 1, wherein several polyester-based layers and several polyurethane elastomer layers are provided, at least some of the layers of the one alternating with layers of the other.
5. Under-packing as claimed in claim 1, wherein the elastomeric component presents the following chemical/physical characteristics:
Shore hardness A 75-95 DIN 53505 Density g/cm3 1.10-1.25 DIN 53479 Cyclic compression % 60% compressible DIN 53517 Resilience % 30-40 DIN 53512 Solvent resistance resistant
(wherein the cyclic compression test is performed by carrying out a cycle of one million compressions (of 60% on the compressible side, i.e. on the polyurethane elastomer side) without undergoing any thickness decrease).
6. Under-packing as claimed in claim 5, wherein the same chemical-physical characteristics apply to the polyurethane elastomer.
7. Under-packing as claimed in claim 1, wherein a plurality of the superposed polyester layers of the superposed polyester layers being used, some are removably joined together by a pressure sensitive adhesive strip along one of their edges.
8. Under-packing as claimed in claim 5, wherein a plurality of the polyurethane elastomer layers are used, at least one of these layers having different said chemical;/physical characteristics from the remaining layers.
9. Under-packing as claimed in claim 1, wherein the removable polyester layers are not more than three in number, with none of them exceeding 50 μm thickness.
10. Under-packing as claimed in claim 2, wherein several polyester-based layers and several polyurethane elastomer layers are provided, at least some of the layers of the one alternating with layers of the other.
11. Under-packing as claimed in claim 2, wherein the elastomeric component presents the following chemical/physical characteristics:
Shore hardness A 75-95 DIN 53505 Density g/cm3 1.10-1.25 DIN 53479 Cyclic compression % 60% compressible DIN 53517 Resilience % 30-40 DIN 53512 Solvent resistance resistant
(wherein the cyclic compression test is performed by carrying out a cycle of one million compressions (of 60% on the compressible side, i.e. on the polyurethane elastomer side) without undergoing any thickness decrease).
12. Under-packing as claimed in claim 3, wherein the elastomeric component presents the following chemical/physical characteristics:
Shore hardness A 75-95 DIN 53505 Density g/cm3 1.10-1.25 DIN 53479 Cyclic compression % 60% compressible DIN 53517 Resilience % 30-40 DIN 53512 Solvent resistance resistant
(wherein the cyclic compression test is performed by carrying out a cycle of one million compressions (of 60% on the compressible side, i.e. on the polyurethane elastomer side) without undergoing any thickness decrease).
13. Under-packing as claimed in claim 4, wherein the elastomeric component presents the following chemical/physical characteristics:
Shore hardness A 75-95 DIN 53505 Density g/cm3 1.10-1.25 DIN 53479 Cyclic compression % 60% compressible DIN 53517 Resilience % 30-40 DIN 53512 Solvent resistance resistant
(wherein the cyclic compression test is performed by carrying out a cycle of one million compressions (of 60% on the compressible side, i.e. on the polyurethane elastomer side) without undergoing any thickness decrease).
14. Under-packing as claimed in claim 2, wherein a plurality of the superposed polyester layers of the superposed polyester layers being used, some are removably joined together by a pressure sensitive adhesive strip along one of their edges.
15. Under-packing as claimed in claim 3, wherein a plurality of the superposed polyester layers of the superposed polyester layers being used, some are removably joined together by a pressure sensitive adhesive strip along one of their edges.
16. Under-packing as claimed in claim 4, wherein a plurality of the superposed polyester layers of the superposed polyester layers being used, some are removably joined together by a pressure sensitive adhesive strip along one of their edges.
17. Under-packing as claimed in claim 5, wherein a plurality of the superposed polyester layers of the superposed polyester layers being used, some are removably joined together by a pressure sensitive adhesive strip along one of their edges.
18. Under-packing as claimed in claim 6, wherein a plurality of the superposed polyester layers of the superposed polyester layers being used, some are removably joined together by a pressure sensitive adhesive strip along one of their edges.
19. Under-packing as claimed in claim 2, wherein the removable polyester layers are not more than three in number, with none of them exceeding 50 μm thickness.
20. Under-packing as claimed in claim 3, wherein the removable polyester layers are not more than three in number, with none of them exceeding 50 μm thickness.
US10/827,355 2004-01-15 2004-04-20 Self-levelling under-packing for printing presses Abandoned US20050158563A1 (en)

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ITMI20040041 ITMI20040041A1 (en) 2004-01-15 2004-01-15 SELF-LEVELING SUBCOATING FOR PRINTING MACHINES
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US20130276650A1 (en) * 2010-09-30 2013-10-24 Print-Graph Waterless S.p.A Underblanket Of The Blanket Of A Blanket Cylinder Of A Printing Press, Particularly Of The Offset Type

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CN1640664A (en) 2005-07-20
DK1580022T3 (en) 2006-10-30
KR100864128B1 (en) 2008-10-16
ES2265121T3 (en) 2007-02-01
JP2005199687A (en) 2005-07-28
KR20050075302A (en) 2005-07-20
MXPA05000585A (en) 2005-09-14
ZA200500283B (en) 2005-12-28
EP1580022B1 (en) 2006-07-19
ATE333379T1 (en) 2006-08-15
AR047637A1 (en) 2006-02-01
DE602004001574T2 (en) 2007-06-21
EP1580022A1 (en) 2005-09-28
DE202004021729U1 (en) 2010-07-08
PT1580022E (en) 2006-10-31
CN100448691C (en) 2009-01-07
IL165999A0 (en) 2006-01-15
CA2492674A1 (en) 2005-07-15
BRPI0500165A (en) 2005-09-06
DE602004001574D1 (en) 2006-08-31
US20050158564A1 (en) 2005-07-21
IL165999A (en) 2007-03-08
SI1580022T1 (en) 2006-12-31
RU2333106C2 (en) 2008-09-10
TW200530043A (en) 2005-09-16
ITMI20040041A1 (en) 2004-04-15

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