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WO1997031783A1 - Plaque lithographique roulee a texture - Google Patents

Plaque lithographique roulee a texture Download PDF

Info

Publication number
WO1997031783A1
WO1997031783A1 PCT/US1997/003030 US9703030W WO9731783A1 WO 1997031783 A1 WO1997031783 A1 WO 1997031783A1 US 9703030 W US9703030 W US 9703030W WO 9731783 A1 WO9731783 A1 WO 9731783A1
Authority
WO
WIPO (PCT)
Prior art keywords
sheet
rolls
roughness
roll
lithosheet
Prior art date
Application number
PCT/US1997/003030
Other languages
English (en)
Inventor
Michael A. Ringle
Sallie L. Blake
Bobby J. Cunningham
Original Assignee
Aluminum Company Of America
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 Aluminum Company Of America filed Critical Aluminum Company Of America
Priority to AU21385/97A priority Critical patent/AU2138597A/en
Publication of WO1997031783A1 publication Critical patent/WO1997031783A1/fr

Links

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
    • B41N3/00—Preparing for use and conserving printing surfaces
    • B41N3/04—Graining or abrasion by mechanical means

Definitions

  • the present invention relates generally to a method of making aluminum substrates for lithographic plates, which is more commonly identified as lithosheet, and more particularly, to using a textured roll to roll aluminum sheet in a manner that transfers the texture of the roll to the sheet thereby eliminating the directional pattern on work rolls, which is present with the current state of the art.
  • the texture transferred to the sheet is of a non- directional, uniform appearance and provides increased surface area to hold suitable amounts of printing ink and/or to provide an improved surface for subsequent graining.
  • Lithography is defined as the process of printing from a plane surface such as a metal plate on which an image to be printed is ink-receptive and blank areas are ink-repellent.
  • the metal plate used in this process is referred to as "lithoplate” .
  • the term “lithosheet” will refer in particular to aluminum sheet used to make lithoplates. While “lithoplate” incorporates the word “plate”, the substrate used to make lithoplate is better described as sheet or foil.
  • the lithosheet is coated with a hydrophobic (water repelling) light- sensitive material. In general, this material is resistant to attack or dissolution from acids until it is exposed to light and is commonly called a resist. An extended run of the lithosheet is coated and then cut into a lithoplate. The lithoplate is next overlaid with a negative of a desired image and exposed to light.
  • the light causes a reaction in the resist which makes it soluble in acid.
  • the plate is washed with acid to remove the resist leaving the water retentive metal surface of the lithoplate in the non-image areas.
  • the ink-receptive and ink-repellent areas on the lithoplate are developed in the printing process by subjecting the plate to contact with water.
  • the inks used in the printing process are such that they will not stick or adhere to wet surfaces and, thus when the lithoplate is contacted with an ink-laden roller, ink is transferred only to the image area.
  • a lithoplate for printing is directly related to the hydrophobic and hydrophilic characteristics of the image. It is known that uniform roughening of the surface by a "graining" process is advantageous to both adherence of the hydrophobic coating to the lithosheet and in enhancing the water retention character of the metal surface.
  • the objective of graining is to increase the surface area and obtain a uniform non- directional roughness necessary for quality production of printed images.
  • the quality and extension of the grained surface can be measured by measuring roughness (height of surface projections above a datum plane of the sheet) and peak count (the number of projections above the datum plane) , as discussed below.
  • graining lithosheet was accomplished mechanically by ball graining or brushing.
  • ball graining a slurry of steel balls and abrasive material is agitated on the sheet with the extent of roughening controlled.
  • brush graining brushes are rotated or oscillated over the surface covered with an abrasive slurry.
  • the present invention provides the above need by texturing a steel roll or rolls in such a manner that when the roll or rolls are employed to either lightly reduce the thickness of the lithosheet in the last stand of a rolling mill or are used as pinch rolls or skin pass rolls in some other process such as leveling, they impart a surface to the lithosheet with the required roughness, non-directional appearance and peak count.
  • the roll surface is preferably provided with the appropriate texture by electron discharge texturing (EDT) .
  • EDT texturing employs a plurality of arc generating electrodes spaced from the roll surface. The arcs provide a generally uniform roll surface of peaks and valleys of appropriate dimensions.
  • Electron discharge texturing is disclosed in such patents as U.S. 3,619,881 and 4,789,447 to Bills et al and Ahmed et al, respectively.
  • the textured roll can be used to reduce the thickness of the sheet in the final stand or pass of a rolling mill. This reduction is slight, i.e, in the range of zero to fifteen percent of the thickness such that there is substantially little or no elongation of the texture pattern that is transferred from the roll to the lithosheet surface. This same transfer can take place from the pressure of textured pinch rolls on the surface of the sheet being passed between them or from the minimal reduction taken in a skin pass mill.
  • Both surfaces of the lithosheet may also be textured to provide a two sided product, but if not, a relatively smooth roll surface is used on the bottom sheet surface to prevent the directional roll grind pattern of the bottom sheet surface from transferring to an upper sheet surface in a tightly wound coil of the lithosheet.
  • Figure 1 is a three-dimensional, computer generated plot of a surface portion of an aluminum alloy sheet showing minimal extended surface area and directional grind lines on the surface of the sheet
  • Figure 2 is a three-dimensional, computer generated plot of a portion of an aluminum alloy sheet surface that has been electrochemically grained to increase surface area and reduce directional grind lines;
  • Figure 3 is a three-dimensional, computer generated plot of a portion of an aluminum alloy sheet surface rolled by an EDT textured roll, the plot showing pockets formed in the sheet surface by the roll surface;
  • Figure 4 is a diagrammatic partial sectional view of an aluminum alloy sheet provided with a surface suitable for lithoplate purposes, the surface being exaggerated to show peaks of surface material.
  • Figure 1 is a three-dimensional plot of a portion of the surface of an as-rolled aluminum alloy lithosheet, the surface having generally parallel lines formed thereon by a work roll in the final stand or pass of a rolling mill.
  • the surface views of Figures 1 to 3 were obtained by a Phase Shift interferometer viewing the surface of a 1050-H18 aluminum lithographic sheet. This instrument uses white light interference fringes [shifts in light phases] to measure relative peak heights of surface material at a magnification of ten times.)
  • Work rolls are ground to a certain finish before being installed and used in a mill. This process involves a stone wheel rotated against the surface of the mill roll that is also rotated. The process leaves elongated fine scratches in the roll surface. These marks are transferred to the sheet surface physically contacting the roll surface, the grind marks appearing as parallel lines on the sheet surface extending in the rolling direction.
  • the buyer of the lithosheet product of Figure 1 grains the surface of the product, as explained above, to obtain increased surface area, a non- directional appearance and required roughness and peak count.
  • the electrochemically grained surface effected by the buyer is depicted in Figure 2 of the drawings. As shown, the grained surface still has a somewhat directional pattern.
  • Figure 3 of the drawings shows a lithosheet product rolled using a roll textured by the EDT process, the roll surface having substantially no directional pattern for transferal to a sheet surface.
  • Figure 3 shows, in addition, a generally isotropic pattern of pockets of the extended surface provided by the textured roll for holding water or hydrophobic coating material, the pockets having an average depth of 13 to 17 microinches Ra (arithmetic mean of the pocket depths) .
  • the depths of the sheet pockets are provided with a roll surface roughness of 22 to 30 microinches Ra.
  • the roll texture does not transfer perfectly to the sheet surface, as there is usually some elongation of the sheet surface in the rolling - 7 - process .
  • FIG. 4 of the drawings pockets of different depths are diagrammatically shown in a sectional view of an aluminum alloy sheet 10, and are labeled 12 and 14.
  • the pockets are surrounded by peaks of surface material of different heights, labeled by numerals 16 and 18.
  • the peaks and pockets provide an extended surface for receiving a photosensitive hydrophobic coating and water to repel printing inks.
  • the average surface elevation in Figure 4 is shown as phantom line 20.
  • the distance between lines 22 and 24 is known as the "bandwidth" and therefore for a defined bandwidth of twenty micro ⁇ inches, line 22 is 10 microinches above line 20, and line 24 is 10 microinches below line 20.
  • Peak-count is defined as the number of times the surface extends above line 22 and the number of times it extends below line 24.
  • both the pockets labeled 14 and the peaks labeled 18 are counted in the peak-count number while the pockets labeled 12 and the peaks labeled 16 are not counted in the peak-count number.
  • the peak-count for the finite area of the printing surface of sheet 10 lies in the range of 300 to 450 peaks per linear inch measured with a total bandwidth of twenty microinche .
  • Such a peak count for the lithosheet product of the invention is provided by a textured roll having a peak count in the range of 350 to 500 peaks per linear inch extending above and below a total bandwidth of twenty microinches.
  • the directional roll grind pattern ( Figure 1) be significantly reduced in a graining process so that a non-directional relatively rough surface be available for the lithographic printing processes.
  • a textured surface suitable for subsequent graining By using a textured surface suitable for subsequent graining, a multigrained lithosheet product can be produced.
  • the product of the invention can also be used with no graining at all, and will resemble a grained plate product. This allows the lithoplate producer to eliminate an operation and its associated cost.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Metal Rolling (AREA)

Abstract

Procédé permettant de produire une plaque lithographique, dans lequel on donne à au moins un cylindre d'une paire de cylindres une texture de surface constituée de pics microscopiques formés dans le matériau le constituant et un motif n'ayant sensiblement aucune orientation, de façon que la surface du cylindre soit sensiblement uniformément rugueuse. Une plaque métallique (10) est dirigée entre les cylindres de façon que ceux-ci entrent en contact avec les surfaces de la plaque, ce qui donne à au moins une desdites surfaces la rugosité non orientée de la surface du rouleau texturé et, par la formation de dépressions microscopiques (12, 14) à sa surface, étend sa superficie. Ceci permet de retenir les encres d'impression, de coller des pellicules hydrophobes et/ou de créer une rugosité non directionnelle en vue d'un grainage ultérieur.
PCT/US1997/003030 1996-02-27 1997-02-21 Plaque lithographique roulee a texture WO1997031783A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU21385/97A AU2138597A (en) 1996-02-27 1997-02-21 Texture rolled lithosheet

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US60754196A 1996-02-27 1996-02-27
US08/607,541 1996-02-27

Publications (1)

Publication Number Publication Date
WO1997031783A1 true WO1997031783A1 (fr) 1997-09-04

Family

ID=24432731

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/003030 WO1997031783A1 (fr) 1996-02-27 1997-02-21 Plaque lithographique roulee a texture

Country Status (2)

Country Link
AU (1) AU2138597A (fr)
WO (1) WO1997031783A1 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0835764A1 (fr) * 1996-10-11 1998-04-15 Fuji Photo Film Co., Ltd. Plaque lithographique, procédé pour sa réalisation, et procédé pour la préparation d'un support en aluminium pour ladite plaque
WO2001066276A1 (fr) * 1998-12-10 2001-09-13 Alcoa Inc. Rouleau a finition mate destine au traitement de produits de tole et procede de production
WO2001068378A1 (fr) * 1998-03-10 2001-09-20 Alcoa Inc. Feuille d'aluminium grainee au rouleau
US6324978B1 (en) 1999-01-22 2001-12-04 Vaw Aluminum Ag Printing plate substrate and method of making a printing plate substrate or an offset printing plate
WO2002072290A1 (fr) * 2001-03-12 2002-09-19 Alcan International Limited Procede et appareil de texturation d'une feuille ou d'une bande metallique
US6783836B2 (en) * 2000-08-30 2004-08-31 Alcoa Inc. Pretreated sheet product for lithographic plates
EP1577115A3 (fr) * 2004-03-17 2006-05-31 Fuji Photo Film Co., Ltd. Support pour plaque d'impression lithographique et plaque présensibilisée
US7353681B2 (en) 2004-12-03 2008-04-08 Novelis Inc. Roll embossing of discrete features
DE102010007840A1 (de) 2010-02-11 2011-08-11 Wieland-Werke AG, 89079 Elektromechanisches Bauelement oder Gleitelement
DE102010007841A1 (de) 2010-02-11 2011-08-11 Wieland-Werke AG, 89079 Photovoltaikmodul mit einer photoaktiven Schicht oder Solarkollektor mit einem Solarabsorber
US9256129B2 (en) 2014-02-19 2016-02-09 Macdermid Printing Solutions, Llc Method for creating surface texture on flexographic printing elements
WO2016034813A1 (fr) 2014-09-05 2016-03-10 Constellium Neuf-Brisach Procédé de fabrication de capsules de bouchage métalliques mixtes texturées lisses
US10493508B2 (en) 2015-10-14 2019-12-03 Novelis Inc. Engineered work roll texturing

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61162351A (ja) * 1985-01-11 1986-07-23 Kobe Steel Ltd 平版印刷版支持体の砂目製造法
JPH05301479A (ja) * 1992-02-27 1993-11-16 Mitsubishi Kasei Corp 平版印刷版用支持体の製造方法
US5481084A (en) * 1991-03-18 1996-01-02 Aluminum Company Of America Method for treating a surface such as a metal surface and producing products embodying such including lithoplate

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61162351A (ja) * 1985-01-11 1986-07-23 Kobe Steel Ltd 平版印刷版支持体の砂目製造法
US5481084A (en) * 1991-03-18 1996-01-02 Aluminum Company Of America Method for treating a surface such as a metal surface and producing products embodying such including lithoplate
JPH05301479A (ja) * 1992-02-27 1993-11-16 Mitsubishi Kasei Corp 平版印刷版用支持体の製造方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 010, no. 368 (M - 543) 9 December 1986 (1986-12-09) *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 098 (M - 1562) 17 February 1994 (1994-02-17) *

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0835764A1 (fr) * 1996-10-11 1998-04-15 Fuji Photo Film Co., Ltd. Plaque lithographique, procédé pour sa réalisation, et procédé pour la préparation d'un support en aluminium pour ladite plaque
US6232037B1 (en) 1996-10-11 2001-05-15 Fuji Photo Film Co., Ltd. Lithographic printing plate, method for producing lithographic printing plate, and method for producing support for lithographic printing plate
US6551760B2 (en) 1996-10-11 2003-04-22 Fuji Photo Film Co., Ltd. Lithographic printing plate, method for producing lithographic printing plate, and method for producing support for lithographic printing plate
WO2001068378A1 (fr) * 1998-03-10 2001-09-20 Alcoa Inc. Feuille d'aluminium grainee au rouleau
WO2001066276A1 (fr) * 1998-12-10 2001-09-13 Alcoa Inc. Rouleau a finition mate destine au traitement de produits de tole et procede de production
US6324978B1 (en) 1999-01-22 2001-12-04 Vaw Aluminum Ag Printing plate substrate and method of making a printing plate substrate or an offset printing plate
DE19902527B4 (de) * 1999-01-22 2009-06-04 Hydro Aluminium Deutschland Gmbh Druckplattenträger und Verfahren zur Herstellung eines Druckplattenträgers oder einer Offsetdruckplatte
JP3389546B2 (ja) 1999-01-22 2003-03-24 ハイドロ アルミニウム ドイチュランド ゲー・エム・ベー・ハー 印刷版支持体およびその製造方法
ES2189579A1 (es) * 1999-01-22 2003-07-01 Vaw Ver Aluminium Werke Ag Soporte de planchas de impresion y procedimiento de fabricacion de soportes de planchas de impresion o de planchas de impresion offset.
US6783836B2 (en) * 2000-08-30 2004-08-31 Alcoa Inc. Pretreated sheet product for lithographic plates
US7516637B2 (en) 2001-03-12 2009-04-14 Novelis Inc. Method and apparatus for texturing a metal sheet or strip
WO2002072290A1 (fr) * 2001-03-12 2002-09-19 Alcan International Limited Procede et appareil de texturation d'une feuille ou d'une bande metallique
EP1577115A3 (fr) * 2004-03-17 2006-05-31 Fuji Photo Film Co., Ltd. Support pour plaque d'impression lithographique et plaque présensibilisée
US7353681B2 (en) 2004-12-03 2008-04-08 Novelis Inc. Roll embossing of discrete features
US7624609B2 (en) 2004-12-03 2009-12-01 Novelis Inc. Roll embossing of discrete features
WO2011098256A2 (fr) 2010-02-11 2011-08-18 Wieland-Werke Ag Composant électrooptique ou électromécanique ou élément de glissement
DE102010007841A1 (de) 2010-02-11 2011-08-11 Wieland-Werke AG, 89079 Photovoltaikmodul mit einer photoaktiven Schicht oder Solarkollektor mit einem Solarabsorber
DE102010007840A1 (de) 2010-02-11 2011-08-11 Wieland-Werke AG, 89079 Elektromechanisches Bauelement oder Gleitelement
WO2011098255A2 (fr) 2010-02-11 2011-08-18 Wieland-Werke Ag Module photovoltaïque comprenant une couche photoactive ou capteur solaire comprenant un absorbeur solaire
US9023485B2 (en) 2010-02-11 2015-05-05 Wieland-Werke Ag Electrooptical or electromechanical component or sliding element
US9256129B2 (en) 2014-02-19 2016-02-09 Macdermid Printing Solutions, Llc Method for creating surface texture on flexographic printing elements
US10216086B2 (en) 2014-02-19 2019-02-26 Macdermid Graphics Solutions, Llc Method for creating surface texture on flexographic printing elements
WO2016034813A1 (fr) 2014-09-05 2016-03-10 Constellium Neuf-Brisach Procédé de fabrication de capsules de bouchage métalliques mixtes texturées lisses
US10787295B2 (en) 2014-09-05 2020-09-29 Constellium Neuf-Brisach Method of manufacturing textured-smooth hybrid metal closure caps
US10493508B2 (en) 2015-10-14 2019-12-03 Novelis Inc. Engineered work roll texturing

Also Published As

Publication number Publication date
AU2138597A (en) 1997-09-16

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