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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F15/00—Screen printers
  • B41F15/14—Details
  • B41F15/34—Screens, Frames; Holders therefor
  • B41F15/36—Screens, Frames; Holders therefor flat
• • 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
• • 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
  • Y10T428/24785—Edge feature including layer embodying mechanically interengaged strands, strand portions or strand-like strips [e.g., weave, knit, 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
  • Y10T428/24—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
  • Y10T428/24975—No layer or component greater than 5 mils thick
• • 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.]
  • Y10T442/10—Scrim [e.g., open net or mesh, gauze, loose or open weave or knit, etc.]
  • Y10T442/102—Woven scrim
  • Y10T442/109—Metal or metal-coated fiber-containing scrim
• • 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.]
  • Y10T442/10—Scrim [e.g., open net or mesh, gauze, loose or open weave or knit, etc.]
  • Y10T442/102—Woven scrim
  • Y10T442/109—Metal or metal-coated fiber-containing scrim
  • Y10T442/11—Including an additional free metal or alloy constituent
• • 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.]
  • Y10T442/10—Scrim [e.g., open net or mesh, gauze, loose or open weave or knit, etc.]
  • Y10T442/102—Woven scrim
  • Y10T442/109—Metal or metal-coated fiber-containing scrim
  • Y10T442/124—Including a natural or synthetic rubber 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
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/10—Scrim [e.g., open net or mesh, gauze, loose or open weave or knit, etc.]
  • Y10T442/102—Woven scrim
  • Y10T442/109—Metal or metal-coated fiber-containing scrim
  • Y10T442/126—Including a preformed film, foil, or sheet
• • 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.]
  • Y10T442/10—Scrim [e.g., open net or mesh, gauze, loose or open weave or knit, etc.]
  • Y10T442/184—Nonwoven scrim
  • Y10T442/188—Metal or metal-coated fiber-containing scrim

Definitions

• the invention relates to a screen printing form with screen printing fabric made of intersecting plastic threads and a coating made of an emulsion, particularly a photosensitive one.
• the invention also relates to a printing device according to the preamble of patent claim 12.
• a screen printing fabric is stretched over a printing frame made of light metal, wood or the like and glued to the printing frame in its tensioned position. Cleaning the fabric enables the subsequent application of a light-sensitive emulsion, for example using a coating trough manually or mechanically with an automatic coating machine. Since the coating cannot be created exactly up to the inside of the frame, the remaining surface must be subsequently sealed with a screen filler. Now the coated surface is exposed by means of a copy template (film) corresponding to the print image. The unexposed areas of the printed image are washed out. After the wash-out process, the actual screen printing stencil is created, the edge zones of which often still have to be covered. Once these covers have dried, the template can be used to print. In addition, the individual devices that are used for the respective manufacturing steps of the template must be cleaned. Thus, the work involved in producing a screen printing stencil - especially a single stencil - is relatively large.
• stencil carriers used today in screen printing are stretched and glued on all sides before the actual stencil is applied.
• the quality of the print depends on the correct tissue tension, the relaxation of the tissue, the set jump, the doctor blade pressure or the like.
• the template In order to overcome the set jump between tissue and print object, the template must be stretched. In the case of stencil carriers without - or with only very little - internal expansion, this leads to high tensile alternating loads, which can lead to rapid fatigue of the stencil carriers or, if need be, to their destruction. Since these low-stretch stencil carriers can be used to print perfectly using the flat screen printing process, a printing frame is required that is able to compensate for the changes in length caused by the jump.
• US-A-3, 303, 777 describes a holder for a stencil on a screen printing machine, in which it is to be fixed and tensioned in two parallel areas - which cross the direction of movement of a displaceable squeegee that presses the printing inks through screen meshes.
• the inventor has set himself the goal of considerably simplifying the production and handling of screen printing forms or stencils, making their use in printing units more user-friendly, and increasing their registration accuracy - even with large print runs.
• the print quality of fine coats and screens should be optimized through a homogeneous coating with a constant structure.
• the plastic threads are coated with a vapor-deposited sheath layer, which in turn is covered by a metal coating - which carries the emulsion - which is formed by electroplating.
• the plastic fabric can also be prepared for plating by so-called sputtering - by cathode sputtering - with the jacket layer.
• a cladding layer of metallic material is formed, which preferably contains gold, silver, nickel, copper, steel and / or a light metal - in particular aluminum - alone or as an alloy.
• layer thicknesses of about 5 to over 200 nanometers - above all over 50 nm - are produced for the screen printing fabric according to the invention, which depending on the type of fabric and type of vapor deposition have surface resistances of less than 0.2 ohm / 2 up to a few hundred ohms / 2.
• the electrical conductivity of the tissue is produced by the dry process step of vapor deposition, cathode sputtering - that is to say the sputtering mentioned - or by plasma spraying in a vacuum.
• this conductive fabric is mainly determined by its metallization, for example by means of galvanic nickel plating.
• the elongation is markedly reduced with increased strength of the fabric, and its sliding resistance - regardless of the type of starting fabric - is increased extraordinarily.
• the metallizing substances primarily contribute to the strength at the binding points of the fabric made of plastic base materials and form a conductive surface. This makes it possible to replace expensive metallic fabrics with metallized plastic fabrics with similar properties.
• a metallized plastic fabric is used as the basis for the screen printing plate, which is ready-made and provided with a coating, preferably with a metal coating made of nickel because of its general strength.
• the metallic surface of the screen printing plate reduces the wear of the stencil, making it possible to achieve very long print runs.
• the conductive surface of the screen printing plate prevents static Charges. Restrictions regarding substrates or inks due to structural problems can practically be excluded.
• the metallized plastic fabric according to the invention ensures minimal stretching with a sufficient basic strength and has the effect that there are barely measurable register differences on the template, regardless of the tensioning set.
• connecting elements for attachment to a printing frame can be provided on two opposite edges with connecting elements for attachment to a printing frame - preferred connecting elements are profiled connecting strips between which the relatively rigid screen printing plate extends.
• the printing frame mentioned at the outset in which the screen printing plate - with the interposition of connecting strips arranged on two parallel plate edges - on the one hand on a frame side of the printing frame and on the other hand on a tensioning bar or the like which is displaceable therein parallel to that frame side Movement element is fixed.
• the clamping bar is transverse to the direction of movement of a squeegee pushing through the printing inks. Thanks to this type of fastening in two areas that cross the doctor blade direction - and unfastened longitudinal edges - a sag in the form of a chain line between the longitudinal edges that distorts the printing result is avoided.
• the metallization of the fabric according to the invention results in sufficient angular strength, with the result that the screen printing plate only has to be tensioned in one direction and yet there are no register differences transverse to the tensioning direction.
• this one-sided clamping allows the printed image to the side up to the edge of the screen pressure plate can be placed; there is only room for the attachment of a color border, which can be glued, welded, sewn or attached in any other way.
• the screen printing plate should be clamped at a distance from a surface to be printed.
• connecting or connecting strips are of inventive importance.
• a cross-section of an S-shaped angled connecting strip is offered, the cantilever leg of which is in the tensioned position on the one hand a lower edge of the frame side - or the tensioning beam - and on the other hand a shoulder in the undercut interior of the hollow frame side - or the hollow tensioning beam.
• its cantilever leg rests in the tensioning direction of a support surface of a tensioning shaft in the interior of the hollow frame side or the hollow tensioning beam.
• a further connecting strip is a hook strip inclined against the plane of the screen printing plate, which is designed to be insertable into an oblique groove on the frame side or the tensioning beam.
• Another connecting strip is provided with a cantilever leg bent out of the plane of the screen printing plate at an angle, which in the same way inclined oblique slot of the frame side or the clamping beam is designed to be insertable.
• the screen printing plate has a keder bead on each of two parallel edges, which bead can be inserted into a bearing profile as a connecting element. Thanks to these requirements, the screen printing plate consists of a metallized plastic fabric, which is machine-coated with a light-sensitive substrate and possibly protected with a film on the coating side. This eliminates all the preparatory work customary today in the production of screen printing stencils; the screen printing plate can be exposed and developed directly.
• the metallic surface of the stencil carrier ensures extensive chemical resistance and high mechanical abrasion resistance.
• the mechanical coating guarantees a consistently high print quality with brilliant edge sharpness and exact dosing of the medium to be printed.
• Another advantage is that the degree of utilization of the screen printing plate - that is, the ratio of the printable area to the total area - is far above that of a conventional fabric, possibly doubled.
• the squeegee pressure remains minimal since no deformation of the print carrier can be overcome.
• the doctor blade load over the printing width is constant because the known additional forces at the doctor blade ends are eliminated due to the lack of transverse tension.
• the printing frame allows - thanks to a one-sided movable stencil holder - the use of screen printing stencils with extremely low internal expansion;
• the clamping loads on the screen printing stencil carrier can be kept low by means of a printing frame, which can be used for minimal squeegee pressure settings, wear on the printing plate and squeegee are minimized as a result;
• FIG. 3 shows an enlarged detail from FIG. 2 with an oblique view of a binding of two crossing threads
• FIG. 15, 16 sketches for assembly aids.
• a fabric 10 for the production of screen printing stencils is produced from intersecting warp threads 12 and weft threads 14, according to FIG. 1 in a so-called plain weave, in which a repeat unit - a repetition unit defined by a certain number of binding points 16 - each two warp threads 12 and two weft threads 14 belong.
• These threads 12, 14 can consist of any plastic base materials, such as polyamide (PA), polyethylene (PE), polyethylene terephthalate (PET) or the like. More.
• the plastic fabric 10 is continuously subjected to a vapor deposition process, the maximum web length being determined by the highest possible winding diameter in the coating system.
• Gold, silver, copper, nickel, steel, aluminum or the like, noble, non-ferrous, heavy or light metals - each alone or in combination - are used as vapor deposition materials, in coordination with a subsequent electroplating.
• the evaporation or sputtering process - possibly also a plasma application in vacuum - is carried out on both sides and may be repeated several times for special requirements.
• This dry coating process can also lead to material accumulations in the region of each bond 16, one of which is indicated at 20 in FIG. 2 between the crossing threads 12, 14.
• Direct galvanic metal deposition can now be carried out on the plastic fabric prepared by vapor deposition in the manner described. Any metals can be used, such as Cu, Ni or. Like ..
• the evaporation material and the evaporation thickness have to be matched to the subsequent electroplating process in order to avoid that the cladding layer 18 is degraded by the electroplating bath, which would reduce or completely eliminate the conductivity of the evaporation during longer exposure times.
• Combinations for galvanic metallization are
• the galvanic metallization can be carried out as a continuous process with practically any roll length and leads to a closed metal coating 22 of selectable layer thickness e - of preferably 2 ⁇ m to 20 ⁇ m and more - over the entire fabric 10 a ; this metal coating 22 ensures high mechanical stability, above all sliding resistance, and also chemical resistance of the metallized fabric 10 a ; its strength is significantly increased with a significant reduction in the elasticity.
• FIG. 4 shows in a printing frame 24 a plate-like screen printing stencil or screen printing form 26 made of the metallized fabric 10 a produced in the manner described above and connecting profiles or strips 28 fixed on two opposite edges.
• the fabric 10 a is provided with a light-sensitive emulsion layer, which contains a phototechnically produced printing pattern to be printed on a printing material 30 attached underneath.
• the printing material 30 is placed on a printing table at a jump dimension or distance h below the - not shown in FIG. 4 - clamping plane of the screen printing stencil 26; during the printing process, a squeegee 32 guided parallel to those connecting strips 28 over the fabric 10 a pushes the fabric 10 a linearly onto the printing material 30.
• the doctor 32 - also called scraper - here is a rectangular profile with a printing edge 33, the length of which is approximately that of Connection strips 28 corresponds and presses the printing ink on its path of movement through the open screen openings of the fabric 10 a in the printing pattern.
• the rectangular printing frame 24 consists of four frame profiles or frame sides 34, which are designed here as hollow profile sections and one of which - referred to as 34 a - offers an undercut interior 36 for hanging in the one connecting strip 28; the latter is cross-sectionally approximately S-shaped with both sides of a main strip 28 a designed to whose longitudinal edges opposite abkra- constricting Kragschenkel 29, one of which is fixed in the inner space 28 and which a arranged on the other to a lower edge 38 conforms of the hollow profile on the tissue 10th
• the similarly designed - cross-sectionally counter-rotating - other connecting bar 28 is mounted in the manner described in the undercut interior 36 of a - that hollow section 34 a cross-sectionally the same - tensioning bar 40, which with the adjacent parallel hollow section 34 of the pressure frame 24 by coil springs as Energy storage 42 is connected and can therefore be moved against the clamping direction x when pressure on the tissue 10 a limited.
• FIG. 6 shows a screen printing stencil 26 with the parallel connecting strips 28 described in relation to FIG. 4, which are mounted here on the frame profile 34 c on an insert shoulder 46 of an additional strip 47 and on the clamping beam 40 c on a segment shoulder 48 of a clamping shaft 50. These bearings are illustrated in the enlarged representations of FIGS. 8.9.
• a tension spring 52 presses on a bearing profile 54, which loads a cantilevered nose 56 of the frame profile 34 d or the tension bar 40 d ;
• a keder bead 58 of the screen printing stencil 26 rests in the keder groove 54 in the rod-like bearing profile 54.
• the frame profile 34 e of FIG. 10 accommodates, in an oblique slot 60, a leg 29 a which is inclined upward at an angle w of ⁇ 40 ° , of a connecting strip 28 e which is approximately angular in cross section.
• This leg 29 a is held by a spring-loaded clamping piece 62 of the frame profile 34 e .
• FIG. 11 illustrates the mounting of the hook strip 44 mentioned above, which engages behind a groove wall 64 of an oblique groove 66 of the frame profile 34 b which is inclined at an angle t of approximately 120 ° against the surface of the screen printing stencil 26.
• the coil springs 53 are missing; the plastic strip 82a is optionally cambered in order to compensate for the deflection of the frame or to relieve the plate edges.
• 16 indicate assembly aids; 15, the clamping jaw 86 receives an angled and magnetic sheet metal 90, the register pins 68 a and - under a shaft 92 - a magnetic tape 94 are assigned. Thanks to this device, the edge area of the template 26 can be better handled. 16 illustrates a suction cup 96 on a vacuum strip 98, which is seated on an elastic film 27, which is located on the edge of the screen printing plate 26, as a guide or lifting aid.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Plasma & Fusion (AREA)
• Textile Engineering (AREA)
• Printing Plates And Materials Therefor (AREA)
• Screen Printers (AREA)
• Manufacturing Of Printed Wiring (AREA)
• Printing Methods (AREA)
• Non-Metallic Protective Coatings For Printed Circuits (AREA)
• Inks, Pencil-Leads, Or Crayons (AREA)
• Purses, Travelling Bags, Baskets, Or Suitcases (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7805498

Family Applications (1)

Country Status (16)

Families Citing this family (15)

Family Cites Families (6)

• 1997
  • 1997-09-05 DE DE19738873A patent/DE19738873A1/de not_active Withdrawn
  • 1997-09-05 DE DE19738879A patent/DE19738879A1/de not_active Ceased
  • 1997-09-10 BR BR9711793A patent/BR9711793A/pt not_active Application Discontinuation
  • 1997-09-10 ES ES97909245T patent/ES2162673T3/es not_active Expired - Lifetime
  • 1997-09-10 CA CA002265683A patent/CA2265683A1/fr not_active Abandoned
  • 1997-09-10 AT AT97909245T patent/ATE203462T1/de not_active IP Right Cessation
  • 1997-09-10 CZ CZ99753A patent/CZ75399A3/cs unknown
  • 1997-09-10 CN CN97197780A patent/CN1230147A/zh active Pending
  • 1997-09-10 AU AU47020/97A patent/AU4702097A/en not_active Abandoned
  • 1997-09-10 JP JP10513019A patent/JP2001500077A/ja active Pending
  • 1997-09-10 KR KR1019997002120A patent/KR20000036101A/ko not_active Withdrawn
  • 1997-09-10 EP EP97909245A patent/EP0925195B1/fr not_active Expired - Lifetime
  • 1997-09-10 PT PT97909245T patent/PT925195E/pt unknown
  • 1997-09-10 DE DE59704140T patent/DE59704140D1/de not_active Expired - Fee Related
  • 1997-09-10 WO PCT/EP1997/004953 patent/WO1998010941A1/fr not_active Ceased
  • 1997-09-10 US US09/254,820 patent/US6258445B1/en not_active Expired - Fee Related
  • 1997-09-15 ID IDP973195A patent/ID19179A/id unknown
• 1998
  • 1998-02-20 TW TW086113094A patent/TW494063B/zh active

Non-Patent Citations (1)

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