WO2020016624A1 - Écran métallique asymétrique pour sérigraphie à ligne fine et écran pour imprimer des lignes fines comprenant ledit écran métallique - Google Patents

Écran métallique asymétrique pour sérigraphie à ligne fine et écran pour imprimer des lignes fines comprenant ledit écran métallique Download PDF

Info

Publication number
WO2020016624A1
WO2020016624A1 PCT/IB2018/055249 IB2018055249W WO2020016624A1 WO 2020016624 A1 WO2020016624 A1 WO 2020016624A1 IB 2018055249 W IB2018055249 W IB 2018055249W WO 2020016624 A1 WO2020016624 A1 WO 2020016624A1
Authority
WO
WIPO (PCT)
Prior art keywords
screen
ribs
printing
width
microns
Prior art date
Application number
PCT/IB2018/055249
Other languages
English (en)
Inventor
Ross BALFOUR
Original Assignee
Saati S.P.A.
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 Saati S.P.A. filed Critical Saati S.P.A.
Priority to PCT/IB2018/055249 priority Critical patent/WO2020016624A1/fr
Publication of WO2020016624A1 publication Critical patent/WO2020016624A1/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
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/24—Stencils; Stencil materials; Carriers therefor
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/10—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern
    • H05K3/12—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern using thick film techniques, e.g. printing techniques to apply the conductive material or similar techniques for applying conductive paste or ink patterns
    • H05K3/1216—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern using thick film techniques, e.g. printing techniques to apply the conductive material or similar techniques for applying conductive paste or ink patterns by screen printing or stencil printing
    • H05K3/1225—Screens or stencils; Holders therefor
    • 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
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/24—Stencils; Stencil materials; Carriers therefor
    • B41N1/247—Meshes, gauzes, woven or similar screen materials; Preparation thereof, e.g. by plasma treatment
    • 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
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/24—Stencils; Stencil materials; Carriers therefor
    • B41N1/248—Mechanical details, e.g. fixation holes, reinforcement or guiding means; Perforation lines; Ink holding means; Visually or otherwise detectable marking means; Stencil units

Definitions

  • the present invention relates to an asymmetric metal screen mesh for fine line screen printing.
  • the invention concerns also the screen for printing fine lines comprising said asymmetric metal screen mesh.
  • the field of the invention is that of electroless metal, for example plated Nickel mesh, with wide apertures of from 50 to 200 m, that cannot be simulated with a woven mesh structure.
  • the application of this mesh is for screen printing in an ultra-fine line printing process, in particular for lines from 10 to 60 m. Typical examples of this are the printing of current collecting finger electrodes on solar cells, or the fine and finely spaced electrodes used to generate capacitive fields for touch screens.
  • the metal screen of the invention has also the purpose of controlling the coating thickness and minimizing any variation within a tolerance of one or two microns.
  • the invention has further the object to realize a screen for printing allowing the screen to be quickly produced, simply by changing the pattern of an electroplating master according to a not cost prohibitive method.
  • the metal screen of the invention having low frequency ribs in one direction combined with high frequency ribs in the perpendicular direction, wide apertures in the screen structure are allowed.
  • the low frequency ribs of the screen of the invention by design are wider than the high frequency ribs that run in the perpendicular direction, in order to form the asymmetric screen structure and give tensile strength to the screen.
  • the high frequency perpendicular ribs of the screen of the invention by design are very narrow, in order to minimize screen interference during the printing process and allow for cleaner and more complete ink transfer when very fine lines must be printed and accurately reproduced.
  • the invention has further the advantage of providing an electroformed metal screen that allows a very thin overall screen thickness and flat profile to be maintained, despite the mismatch in rib width and presence of ribs with a width many times the dimension of the overall thickness.
  • the metal screen of the invention has also the advantage of controlling the coating thickness and minimizing any variation within a tolerance of one or two microns.
  • thescreen interference’ problems are avoided, due to the absence of woven mesh knuckles causing blockage of the narrow screen opening and preventing ink transfer during fine line printing when woven mesh are used for screen printing.
  • the screen of the present invention has further the advantage of allowing the screen to be quickly produced, simply by changing the pattern of an electroplating master according to a not cost prohibitive method.
  • the screen of the invention further allows a typical mesh to be used with many different patterns of fine lines to be printed.
  • FIG. 1 shows a printing screen of the prior art, made by woven meshes
  • figure 2 is a cross section of the printing screen of figure 1 ;
  • FIG. 5 and 6 are top views of the screen for printing of the invention.
  • FIG. 7 is a schematic view of the metal screen of the invention.
  • FIG. 8 is an enlarged view of a particular of the screen of figure 7;
  • figure 9 illustrates the cross section of the screen for printing provided with the metal screen of figure 5;
  • FIG. 10 is a view of the fine lines realized with the screen for printing of the invention.
  • the asymmetric electroformed mesh of the screen of the present invention avoids the‘mesh interference’ problems that exist with woven mesh normally used for screen printing.
  • This interference occurs when the woven mesh knuckles 9 of the screen 10 of the prior art shown in figure 1 (30 m screen opening in 360.0006 stainless steel wire-mesh) cause blockage of the narrow screen opening 7 and prevent ink transfer during fine line printing 12, as is shown in the figures 3 and 4.
  • the woven mesh screen of figure 2 has an open area 7 passing through the weft 15 and the warp 16 in the presence of an emulsion 17.
  • the silver paste or ink thus produces a conductive line 12 which, as it is shown in the figures 3 and 4, exhibits defects and irregularities that are as large as the line 12 is finer.
  • the screen for printing 5 of the invention comprises a metal screen 1 (of nickel, gold and the like) and an emulsion of photosensitive material 4.
  • the metal screen 1 of figures 5 and 6 is provided with low frequency ribs 2 in one direction, combined with high frequency ribs 3 in the direction perpendicular to that of said ribs 2. This allows for wide openings 6 in the screen structure 1 of figures 7 and 8.
  • the low frequency ribs 2 of the metal screen 1 of the invention by design are wider than the high frequency ribs 3 that run in the perpendicular direction, in order to form the asymmetric screen structure and give tensile strength to the screen 1.
  • the high frequency perpendicular ribs 3 of the screen of the invention by design are very narrow, in order to minimize screen interference during the printing process and allow for cleaner and more complete ink transfer when very fine lines must be printed and accurately reproduced.
  • the width of the high frequency ribs 3 is 30 m at the maximum and the width of said low frequency ribs 2 ranges from 50 to 100 m.
  • ribs 2 in one direction with from 50 to 100 microns, preferably 60 microns width, and frequency of from 30 to 60, preferably 40/cm, are matched with perpendicular from 10 to 30 microns, preferably 20 microns wide ribs 3 that have a frequency of from 80 to 240, preferably 120/cm.
  • a further benefit of the electroformed screen 1 of the invention is that it allows a very thin overall screen thickness and flat profile to be maintained, for instance 20 microns in the preferred example, despite the mismatch in rib width between the ribs 2 and 3.
  • the screen 1 of the present invention is used in conjunction with a photosensitive material, preferably an emulsion forming a coating 4 that provides the screen for printing 5 of the present invention, in which said coating forming material can be either liquid based, as a so called photo-emulsion, or as an alternative a pre-coated film, as a so called "capillary film".
  • the photosensitive emulsion 4 or film in use must be accurately applied to the metal screen 1 with a precise and even thickness over the whole area that is to be converted into the screen for printing 5. This object is easily reached thanks to the screen 1 of the invention, having a well defined and consistent open area percentage. During the emulsion coating or film laminating steps, it is possible to control the thickness of the coating 4 and minimize any variation within a tolerance of one or two microns.
  • the screen 1 is formed to define apertures 7 that will be printed as fine lines 8. These fine lines are aligned in register with the wide screen apertures 6 and thus avoid contact the wider set of ribs 2 that define said apertures. This is illustrated in the example of figure 5, in which a typical 30 micron screen aperture 7 is precisely located and allows clean transfer of the ink during printing, with minimum influence of interference by the screen.
  • the screen 1 of the present invention because it has a consistent open area, is ideally suited to allow precise control of coating thickness, and therefore good control over the curing process during subsequent screen production.
  • the screen of the invention exhibits, as compared to the woven screens of the prior art, a consistent and reproducible image quality in respect with fine resolution and good definition of the fine lines to be printed. At the same time said lines are fully and reproducibly cured, in order to maximize the printing life of the resulting screen.
  • a typical mesh of the screen 1 of the present invention can be used with many different patterns of fine lines to be printed.
  • the 40 x 120 (per cm) screen has a wide aspect aperture 6 spacing every 0.25 mm. It can be used with a selection of finger electrode patterns, including those with regular spacing of 1.250 mm, 1.500 mm, 1 .750 mm, 2.000 mm, 2.250 mm and 2.500 mm, and this corresponds to printing a pattern of 120, 100, 86, 76, 66 and 60 electrodes respectively onto a standard 156 mm wafer.
  • a screen for printing 1 is realized reproducing a pattern that represents 30 micron finger electrodes 8 for printing onto the front side of a solar cell.
  • the screen apertures 7 are precisely positioned between the wide ribs 2 of the asymmetric screen 1. Subsequent interference between the screen 1 and silver paste forming fine lines 8 is minimized during the printing and transfer process, since only the thin transversal ribs 3 of the screen are present in the screen apertures 7.
  • the screen 1 can have different thicknesses and patterns, enabling paste transfer to occur with minimal obstruction and allows thinner electrodes to be printed (widths ranging from 10 to 50, preferably 30 microns) with consistent width and aspect ratio, than is possible with a woven mesh structure.
  • figure 1 shows a photo-sensitive material on woven mesh similar to that of figure 5, but in this case 360.0006 (that is 360 threads/inch having a diameter of 0.0006 inch) and it suffers mesh interference effects that inhibit silver paste transfer and thereby limit the minimum line width that can be printed with satisfactory results.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Printing Plates And Materials Therefor (AREA)

Abstract

La présente invention concerne un écran métallique asymétrique (1) pour la sérigraphie à ligne fine, comprenant des nervures basse fréquence (2) dans une direction, combinées à des nervures haute fréquence (3) dans la direction perpendiculaire à celle desdites nervures basse fréquence (2), la largeur desdites nervures haute fréquence (3) étant inférieure à la largeur desdites nervures basse fréquence (2). Grâce à l'écran de la présente invention, les problèmes « d'interférence d'écran » sont évités, du fait de l'absence de charnons en maille tissée provoquant un blocage de l'ouverture d'écran étroite et empêchant le transfert d'encre pendant l'impression à ligne fine lorsque la maille tissée est utilisée pour l'impression sérigraphique.
PCT/IB2018/055249 2018-07-16 2018-07-16 Écran métallique asymétrique pour sérigraphie à ligne fine et écran pour imprimer des lignes fines comprenant ledit écran métallique WO2020016624A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IB2018/055249 WO2020016624A1 (fr) 2018-07-16 2018-07-16 Écran métallique asymétrique pour sérigraphie à ligne fine et écran pour imprimer des lignes fines comprenant ledit écran métallique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2018/055249 WO2020016624A1 (fr) 2018-07-16 2018-07-16 Écran métallique asymétrique pour sérigraphie à ligne fine et écran pour imprimer des lignes fines comprenant ledit écran métallique

Publications (1)

Publication Number Publication Date
WO2020016624A1 true WO2020016624A1 (fr) 2020-01-23

Family

ID=63364108

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2018/055249 WO2020016624A1 (fr) 2018-07-16 2018-07-16 Écran métallique asymétrique pour sérigraphie à ligne fine et écran pour imprimer des lignes fines comprenant ledit écran métallique

Country Status (1)

Country Link
WO (1) WO2020016624A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202008012829U1 (de) * 2008-09-26 2008-12-04 Nb Technologies Gmbh Siebdruckform
WO2011158913A1 (fr) * 2010-06-16 2011-12-22 株式会社コベルコ科研 Élément à mailles pour sérigraphie
JP2012000844A (ja) * 2010-06-16 2012-01-05 Kobelco Kaken:Kk スクリーン印刷用メッシュ部材
WO2013152693A1 (fr) * 2012-04-10 2013-10-17 昆山允升吉光电科技有限公司 Treillis métallique alvéolé
WO2013191194A1 (fr) * 2012-06-19 2013-12-27 株式会社コベルコ科研 Élément maille pour sérigraphie et plaque de sérigraphie
CN103361680B (zh) * 2012-04-10 2017-06-06 昆山允升吉光电科技有限公司 电铸平面丝网

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202008012829U1 (de) * 2008-09-26 2008-12-04 Nb Technologies Gmbh Siebdruckform
WO2011158913A1 (fr) * 2010-06-16 2011-12-22 株式会社コベルコ科研 Élément à mailles pour sérigraphie
JP2012000844A (ja) * 2010-06-16 2012-01-05 Kobelco Kaken:Kk スクリーン印刷用メッシュ部材
WO2013152693A1 (fr) * 2012-04-10 2013-10-17 昆山允升吉光电科技有限公司 Treillis métallique alvéolé
CN103361680B (zh) * 2012-04-10 2017-06-06 昆山允升吉光电科技有限公司 电铸平面丝网
WO2013191194A1 (fr) * 2012-06-19 2013-12-27 株式会社コベルコ科研 Élément maille pour sérigraphie et plaque de sérigraphie

Similar Documents

Publication Publication Date Title
CN110588148B (zh) 可局部控制纱厚的网版及其制作方法
DK3107735T3 (en) Screen printing template and method for its imaging
JP2008162197A (ja) スクリーンマスクおよびその製造法
WO2020016624A1 (fr) Écran métallique asymétrique pour sérigraphie à ligne fine et écran pour imprimer des lignes fines comprenant ledit écran métallique
CN110614839B (zh) 可调整网布透墨量的网版及其制作方法
EP0085979B1 (fr) Procédé de fabrication de grilles métalliques autoportantes
KR20000036100A (ko) 모직물 스트립, 특히 스크린 인쇄 형상, 및 모직물, 특히 스크린인쇄 모직물 제조 방법
JP2001500077A (ja) スクリーン印刷版および可撓性スクリーン印刷版を収納する装置
TWI615279B (zh) 具有複合材質網之網版製作方法
US9718267B2 (en) Screen printing apparatus including support bars, and methods of using same
JP5814023B2 (ja) サスペンドメタルマスクの製造方法
JP2004025709A (ja) スクリーン印刷版およびその製造方法
DE102013009462A1 (de) Verfahren zum Herstellen einer Siebstruktur
JP4268010B2 (ja) 高オープニング率リジダイズドスクリーン、高オープニング率サスペンドメタルマスク及びその製造方法。
CN115027129A (zh) 一种全开口多层结构金属版及其制备方法
JP5697830B2 (ja) スクリーン印刷版およびスクリーン印刷装置
JP3710428B2 (ja) メッシュ織物及び当該メッシュ織物を使用したスクリーン印刷版
JPH06938A (ja) メタルマスク及びその製造方法
JP4314970B2 (ja) スクリーン印刷版の製造方法
CN214727286U (zh) 具有容料结构的印刷网版
JP4314969B2 (ja) スクリーン印刷版の製造方法
CN115230303A (zh) 一种可变开口的印刷网版及其制作方法
CN212920778U (zh) 一种无网结网版
CN219686828U (zh) 近全开口印刷钢版
JP7125533B1 (ja) 印刷用メタルマスクの製造方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18759391

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18759391

Country of ref document: EP

Kind code of ref document: A1