US3681208A - Method for manufacturing a metal stencil - Google Patents

Method for manufacturing a metal stencil Download PDF

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Publication number
US3681208A
US3681208A US83377A US3681208DA US3681208A US 3681208 A US3681208 A US 3681208A US 83377 A US83377 A US 83377A US 3681208D A US3681208D A US 3681208DA US 3681208 A US3681208 A US 3681208A
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US
United States
Prior art keywords
matrix
stencil
metal
wire
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US83377A
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English (en)
Inventor
Lodweijk Anselrode
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stork Amsterdam NV
Original Assignee
Stork Amsterdam NV
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 Stork Amsterdam NV filed Critical Stork Amsterdam NV
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Publication of US3681208A publication Critical patent/US3681208A/en
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D1/00—Electroforming
    • C25D1/10—Moulds; Masks; Masterforms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/14—Forme preparation for stencil-printing or silk-screen printing
    • B41C1/142—Forme preparation for stencil-printing or silk-screen printing using a galvanic or electroless metal deposition processing step

Definitions

  • the invention relates principally to a method for manu facturing a metal stencil comprising a perforated first layer and a second layer composed of wires. So far this method was performed by disposing two gauzes over each other which were at first cylindrieally bent and subsequently secured.
  • the inner cylinder obtained by soldering or welding, consists of a strong wire netting serving as a supporting cylinder.
  • a finer gauze is tensioned around this latter cylinder.
  • the finer gauze may consist of a flat fabric which is permanently held in a cylindrical form by means of a glued joint, or the gauze may already previously be embodied as a seamless knitted cylindrical hose.
  • the finest stencil which can be manufactured thereby is provided with 1600 to 2000 perforations per cm.
  • the diameter of the perforations amounts then only to forty to fifty microns at a thickness of wall of about eighty microns.
  • the invention starts from the known method mentioned in the opening part of this specification.
  • the product obtained with the method according to the invention is distinguished in that the stencil as it were is constructed from two different materials united into a whole, the perforation on the inner side being mostly not identical to that on the outer side Due to this new method a screen cylinder or stencil is obtained, having on its inner side a screen corresponding to the matrix While the outer side exhibits a slotted screen consisting of parallelly extending slots (the space between the juxtaposed wires).
  • the invention is also based on the understanding that in order to absorb the forces transverse to the direction of the squeegee it sufiices to use a Wall thickness amounting to 25-33% of that required to absorb the frictional forces of the squeegee acting perpendicular thereto.
  • the latter force to which is added the frictional force exerted by the material to be printed upon the stencil is entirely absorbed by the wires.
  • the usual thickness of microns required for galvanic stencils can be reduced to only 25 to 30 microns, whilst maintaining a commensurate strength and life time of the stencil.
  • a preferred embodiment of the method according to the invention is obtained when one starts from a cylindrical matrix and when the row of wires is applied by winding helically at least one wire around the matrix.
  • the row of wires is applied by winding helically at least one wire around the matrix.
  • the wire or wires applied according to the invention may have a rather arbitrary compositions but preferably a wire of conductive material or with a conductive surface is applied.
  • the embedment is thereby improved and the progress of the galvanic part of the process is facilitated.
  • a non-conductive wire will preferably be used when the mechanical load of the stencil to be manufactured in the operative direction of the squeegee is small and when a very high value is attached to the greatest possible distance between the windings of the wire at a given number of windings per cm. of the length of the matrix.
  • the invention renders it possible on performing the method to start from a matrix provided with a screen consisting of grooves which substantially extend perpendicularly to the curvature of the surface of the matrix.
  • the width of these grooves determines then the one dimension of the perforations aimed at, while the mutual spacing of the wires lying in the close proximity of each other determines the other dimension.
  • FIG. 1 plan view of a small part of the stencil is depicted (FIG. 1) and further a number of cross sections are represented (FIGS. 2 to 6) of the product according to the invention, and a section (FIG. 7) through a stencil manufactured according to a conventional process, while finally very diagrammatically to a strongly reduced scale a device for performing the method according to the invention is represented (FIG. 8).
  • a screen of shallow pits or grooves 2 is manufactured by etching or by a mechanical process, e.g. by means of a milling roller. These pits or grooves are filled up by an insulating material e.g. enamel or synthetic resin.
  • FIG. 1 shows a particular embodiment in which these groves 2 have a width of 250 microns and a length of 1000 microns. These grooves are interspaced b dams with a width of 30 microns.
  • the longitudinal axis of the grooves extends parallel to the longitudinal axis of the matrix (see FIG. 7).
  • the metal surface of the cylinder 1 is passivated according to a known galvanotechnical method in such a way that a metal subsequently deposited thereon by a galvanic process does not adhere thereto.
  • a single row of very thin mutually spaced wires 3 are provided tight on the matrix 1 by means of a winding device 6 which is diagrammatically represented in FIG. 7.
  • the wire has a diameter of fifty microns and the spacing amounts to hundred microns. Consequently there are odd sixty six windings per cm. length of the matrix.
  • the matrix is introduced into a galvanic bath e.g. a nickel bath.
  • a galvanic process a layer 4 of nickel of 30 microns in thickness is formed on the matrix, this layer enclosnig the windings of the wire entirely. This enclosure is promoted by the deposition upon the wire itself of a layer of nickel of about thirty microns.
  • the final shape of the stencil is represented in FIG. 1 and in longitudinal sections according to the lines IIII and I-II'III (see FIGS. 2 and 3) and in a cross section according to the line IVIV (see FIG. 4).
  • the total wall thickness of the screen cylinder obtained is now eighty microns.
  • the permeability compares favourably with that which would be obtained when by the conventional galvanic method a screen cylinder with a wall thickness of eighty microns would be manufactured.
  • FIG. 7 is compared with FIG. 5. Due to the direction of the grooves 2 parallel to the longitudinal axis of the matrix, the invention renders it possible that the screen cylinder manufactured thereon obtain; at a maximal capacity also a maximal strength 4 in the direction of the centre line '5, whereby the thickness of wall can be kept as small as possible.
  • the screen cylinder obtained is constituted by slightly flattened wires in the longitudinal direction of the matrix of the same form as the cross section according to the line V-V (see FIG. 5) and consisting of the galvanically deposited metal on which and in which the cylindrical wire windings are anchored.
  • the starting point may also be cylindrical matrix, whereby after the manufacture of the stencils the cylinders obtained are severed in the longitudinal direction.
  • the stencil is particularly resistant to changes in dimensions since no relative shifting of the crossings of the wires from a woven gauze can take place;
  • a method of manufacturing a metal stencil having a perforated first layer and a second layer composed of wires comprising the steps of:
  • the matrix includes a screen having grooves which extend perpendicularly with respect to the curvature of the surface of the matrix.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
US83377A 1969-10-31 1970-10-23 Method for manufacturing a metal stencil Expired - Lifetime US3681208A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6916484.A NL165686C (nl) 1969-10-31 1969-10-31 Werkwijze voor het langs galvanische weg vervaardigen van een ongedessineerde sjabloon.

Publications (1)

Publication Number Publication Date
US3681208A true US3681208A (en) 1972-08-01

Family

ID=19808282

Family Applications (1)

Application Number Title Priority Date Filing Date
US83377A Expired - Lifetime US3681208A (en) 1969-10-31 1970-10-23 Method for manufacturing a metal stencil

Country Status (6)

Country Link
US (1) US3681208A (de)
AT (1) AT305317B (de)
DE (1) DE2051728C3 (de)
FR (1) FR2066757A5 (de)
GB (1) GB1276829A (de)
NL (1) NL165686C (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4039396A (en) * 1974-12-24 1977-08-02 Stork Brabant B.V. Method for manufacturing a seamless cylindrical screen gauze
US4042466A (en) * 1974-12-27 1977-08-16 Stork Brabant B.V. Method for manufacturing a metalized screen gauze

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5613196A (en) * 1979-07-05 1981-02-09 Toshin Kogyo Kk Seamless tubular screen for printing and production thereof
DE3331377A1 (de) * 1983-08-31 1985-03-07 Elmar Dr. 8000 München Messerschmitt Siebdrucksieb

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4039396A (en) * 1974-12-24 1977-08-02 Stork Brabant B.V. Method for manufacturing a seamless cylindrical screen gauze
US4042466A (en) * 1974-12-27 1977-08-16 Stork Brabant B.V. Method for manufacturing a metalized screen gauze

Also Published As

Publication number Publication date
NL165686B (nl) 1980-12-15
NL6916484A (de) 1971-05-04
DE2051728C3 (de) 1980-08-14
DE2051728B2 (de) 1979-11-29
FR2066757A5 (de) 1971-08-06
DE2051728A1 (de) 1971-05-13
NL165686C (nl) 1981-05-15
GB1276829A (en) 1972-06-07
AT305317B (de) 1973-02-26

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