WO2011120700A2 - Printing screen and method of manufacturing the same - Google Patents

Printing screen and method of manufacturing the same Download PDF

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Publication number
WO2011120700A2
WO2011120700A2 PCT/EP2011/001632 EP2011001632W WO2011120700A2 WO 2011120700 A2 WO2011120700 A2 WO 2011120700A2 EP 2011001632 W EP2011001632 W EP 2011001632W WO 2011120700 A2 WO2011120700 A2 WO 2011120700A2
Authority
WO
WIPO (PCT)
Prior art keywords
printing screen
bend
bent section
section
attachment members
Prior art date
Application number
PCT/EP2011/001632
Other languages
French (fr)
Other versions
WO2011120700A9 (en
WO2011120700A3 (en
Inventor
Rich Lieske
Brian Lau
David Byrd
Original Assignee
Dtg International Gmbh
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 Dtg International Gmbh filed Critical Dtg International Gmbh
Publication of WO2011120700A2 publication Critical patent/WO2011120700A2/en
Publication of WO2011120700A9 publication Critical patent/WO2011120700A9/en
Publication of WO2011120700A3 publication Critical patent/WO2011120700A3/en

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
    • 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
    • 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

Definitions

  • the present invention relates to a printing screen, often alternatively referred to as a stencil or foil, for printing deposits of a printing medium onto workpieces, such as circuit boards or solar cells.
  • TM tensioning system As supplied by DEK and disclosed in WO-A-2003/093012.
  • the printing screen is mounted in a frame formed of extruded interface members, which are attached to the respective edges of the printing screen, and corner pieces, which loosely couple the respective ends of the interface members in such a manner as to allow the interface members to be tensioned by an external tensioning mechanism.
  • RTM VectorGuard
  • the present invention provides a printing screen, comprising a main section and at least one pair of attachment members at opposite edges of the printing screen, wherein the attachment members each comprise a first bent section which extends inwardly relative to the respective edge of the printing screen, defining a first, outer bend at a junction with the main section of the printing screen and enclosing an acute angle with the main section of the printing screen, a second bent section which extends outwardly relative to the respective edge of the printing screen along an inner surface of the first bent section, defining a second bend at a junction with the first bent section and extending to a location adjacent the outer bend, and a third bent section which extends inwardly relative to the respective edge of the printing screen, defining a third bend at a junction with the second bent section and extending along an inner surface of the main section of the printing screen.
  • the printing screen further comprises a fourth bent section which extends outwardly relative to the respective edge of the printing screen, defining a fourth bend at a junction with the third bent section.
  • the fourth bent section has a free edge which is located at a distance from the outer bend which is less than the inward projection of the second bend along the main section of the printing screen.
  • the fourth bent section extends to a location adjacent the third bend, and further comprising a fifth bent section which extends inwardly relative to the respective edge of the printing screen, defining a fifth bend at a junction with the fourth bent section and extending along an inner surface of the second bent section.
  • the fifth bent section has a free edge which is located at a distance from the second bend which is less than the inward projection of the second bend along the main section of the printing screen.
  • the third bent section has a free edge which is located at a distance from the second bend which is less than the inward projection of the second bend along the main section of the printing screen.
  • the printing screen is formed from a sheet.
  • the sheet is a metal sheet, preferably of stainless steel.
  • the sheet has a thickness of not more than about 0.006". In another embodiment the sheet has a thickness of not more than about 0.005".
  • the sheet has a thickness of not more than about 0.004".
  • the printing screen comprises first and second pairs of attachment members at respective pairs of opposite edges of the printing screen.
  • the attachment members each have a length shorter than a length of the respective edge of the printing screen, such that an inward projection of one attachment member does not extend to the ends of the adjacent attachment members.
  • the present invention provides a method of tensioning the above-described printing screen, comprising the steps of engaging tensioning members at the third bends of the attachment members of the printing screen, and outwardly tensioning the tensioning members to tension the printing screen.
  • the present invention provides a method of fabricating the above-described printing screen, comprising the step of performing a plurality of bending operations to form each attachment member, wherein the first and third bends are formed simultaneously in a single bending operation.
  • the bending operations in forming each of the respective pairs of attachment members are performed in a single pass through a multi-tool bending machine.
  • the present invention provides a method of fabricating the above-described printing screen, comprising the step of performing a plurality of bending operations to form each attachment member, wherein the first and third bends are formed simultaneously in a single bending operation, and the bending operations in forming the two pairs of attachment members are performed in two passes through a multi- tool bending machine.
  • Figure 1 illustrates a perspective view of a printing screen in accordance with a preferred embodiment of the present invention
  • Figure 2 illustrates a side elevational view along one edge of the printing screen of Figure 1;
  • Figures 3(a) to (d) illustrate the bending operations in accordance with one embodiment of the present invention in fabricating one of the attachment members of the printing screen of Figure 1;
  • Figure 4 illustrates a side elevational view along one edge of a printing screen as one modification of the printing screen of Figure 1;
  • Figure 5 illustrates a side elevational view along one edge of a printing screen as another modification of the printing screen of Figure 1.
  • Figures 1 and 2 illustrate a printing screen in accordance with a first embodiment of the present invention.
  • the printing screen 3 is formed from a single metal sheet, in this embodiment having a thickness of 0.004".
  • the printing screen could be formed from a thinner sheet, typically having a thickness of 0.002", or a thicker sheet, having a thickness of 0.006" or greater.
  • the sheet is a stainless steel sheet.
  • the sheet could be formed of other metal alloys.
  • the sheet could be plated.
  • the printing screen 3 comprises a main section 4, in this embodiment of rectangular shape, here square shape, and at least one pair of attachment members 5, 5 at one pair of opposite edges of the printing screen 3, in this embodiment first and second pairs of attachment members 5, 5, 7, 7 at respective pairs of orthogonal edges of the printing screen 3.
  • the main section 4 includes one or more patterns of printing apertures 8 which define the pattern of deposits to be printed onto a workpiece (not illustrated).
  • the one or more patterns of printing apertures 8 can be formed, for example, by laser cutting or etching, as is well known in the art.
  • the attachment members 5, 5, 7, 7 each comprise a first bent section 11 which extends inwardly relative to the respective edge of the printing screen 3, defining a first, outer bend 12 at the junction with the main section 4 of the printing screen 3 and enclosing an acute angle with the main section 4 of the printing screen 3, a second bent section 15 which extends outwardly relative to the respective edge of the printing screen 3 along the inner surface of the first bent section 11, defining a second bend 16 at the junction with the first bent section 11 and extending to a location adjacent the inner radius of the outer bend 12, a third bent section 17 which extends inwardly relative to the respective edge of the printing screen 3, defining a third bend 19 at the junction with the second bent section 15 and extending along an inner surface of the main section 4 of the printing screen 3, and a fourth bent section 21 which extends outwardly relative to the respective edge of the printing screen 3, defining a fourth bend 23 at the junction with the third bent section 17.
  • the fourth bent section 21 has a free edge 25, and this free edge 25 is located at a distance
  • the second and the third bent sections 15, 17 define a fillet, which, when tensioned in a tensioning frame, is engaged at the inner bend radius of the third bend 19 by a tensioning member 20 of the_ tensioning frame, and is pressed into the inner bend radius of the first bend 12 by the tensioning force F.
  • the engagement of the tensioning frame at the inner radius of the third bend 19 acts advantageously to restrain the first bent section 11 from being deflected outwardly when under tension.
  • the attachment members 5, 5, 7, 7 are each fabricated by first forming the fourth bend 23 ( Figure 3(b)), then forming the second bend 16 ( Figure 3(c)), and then subsequently simultaneously forming the first and third bends 12, 19 ( Figure 3(d)).
  • each of the respective pairs of attachment members 5, 5, 7, 7 are performed in a single pass through a multi-tool bending machine, thereby enabling the two pairs of attachment members 5, 5, 7, 7 to be performed in two passes through the bending machine.
  • attachment members 5, 5, 7, 7 each have a length shorter than the length of the respective edge of the printing screen 3.
  • the fourth bent section 21 extends to a location adjacent the inner radius of the third bend 19, and further comprises a fifth bent section 27, which extends inwardly relative to the respective edge of the printing screen 3, defining a fifth bend 29 at the junction with the fourth bent section 21 and extending along an inner surface of the second bent section 15.
  • the fifth bent section 27 has a free edge 31, and this free edge 31 is located at a distance from the second bend 16 which is less than the inward projection X of the second bend 16 along the main section 4 of the printing screen 3.
  • the fourth bent section 21 is omitted, and the third bent section 21 has a free edge 35, and this free edge 35 is located at a distance from the second bend 16 which is less than the inward projection X of the second bend 16 along the main section 4 of the printing screen 3.
  • the sheet could be heat treated, such as by annealing, at least at the edges thereof to facilitate bending of the sheet.
  • those parts of the sheet which are bent could include weakened zones, such as perforations, to facilitate bending.
  • edges of the sheet or at least those parts which are to be bent could be thinned to facilitate bending.

Abstract

A printing screen, comprising a main section and at least one pair of attachment members at opposite edges of the printing screen, wherein the attachment members each comprise a first bent section which extends inwardly relative to the respective edge of the printing screen, defining a first, outer bend at a junction with the main section of the printing screen and enclosing an acute angle with the main section of the printing screen, a second bent section which extends outwardly relative to the respective edge of the printing screen along an inner surface of the first bent section, defining a second bend at a junction with the first bent section and extending to a location adjacent the outer bend, and a third bent section which extends inwardly relative to the respective edge of the printing screen, defining a third bend at a junction with the second bent section and extending along an inner surface of the main section of the printing screen.

Description

PRINTING SCREEN AND METHOD OF MANUFACTURING THE SAME
The present invention relates to a printing screen, often alternatively referred to as a stencil or foil, for printing deposits of a printing medium onto workpieces, such as circuit boards or solar cells.
Various tensioning systems exist for mounting printing screens under tension. One such tensioning system is the VectorGuard ( TM) tensioning system, as supplied by DEK and disclosed in WO-A-2003/093012.
In the existing VectorGuard (RTM) tensioning system, the printing screen is mounted in a frame formed of extruded interface members, which are attached to the respective edges of the printing screen, and corner pieces, which loosely couple the respective ends of the interface members in such a manner as to allow the interface members to be tensioned by an external tensioning mechanism.
It is an aim of the present invention to provide a printing screen which avoids the need for a separate tensioning frame, preferably being formed from a single sheet having folded edges.
In one aspect the present invention provides a printing screen, comprising a main section and at least one pair of attachment members at opposite edges of the printing screen, wherein the attachment members each comprise a first bent section which extends inwardly relative to the respective edge of the printing screen, defining a first, outer bend at a junction with the main section of the printing screen and enclosing an acute angle with the main section of the printing screen, a second bent section which extends outwardly relative to the respective edge of the printing screen along an inner surface of the first bent section, defining a second bend at a junction with the first bent section and extending to a location adjacent the outer bend, and a third bent section which extends inwardly relative to the respective edge of the printing screen, defining a third bend at a junction with the second bent section and extending along an inner surface of the main section of the printing screen.
In one embodiment the printing screen further comprises a fourth bent section which extends outwardly relative to the respective edge of the printing screen, defining a fourth bend at a junction with the third bent section.
In one embodiment the fourth bent section has a free edge which is located at a distance from the outer bend which is less than the inward projection of the second bend along the main section of the printing screen.
In another embodiment the fourth bent section extends to a location adjacent the third bend, and further comprising a fifth bent section which extends inwardly relative to the respective edge of the printing screen, defining a fifth bend at a junction with the fourth bent section and extending along an inner surface of the second bent section.
In one embodiment the fifth bent section has a free edge which is located at a distance from the second bend which is less than the inward projection of the second bend along the main section of the printing screen.
In a further embodiment the third bent section has a free edge which is located at a distance from the second bend which is less than the inward projection of the second bend along the main section of the printing screen.
In one embodiment the printing screen is formed from a sheet.
In one embodiment the sheet is a metal sheet, preferably of stainless steel.
In one embodiment the sheet has a thickness of not more than about 0.006". In another embodiment the sheet has a thickness of not more than about 0.005".
In a further embodiment the sheet has a thickness of not more than about 0.004".
In one embodiment the printing screen comprises first and second pairs of attachment members at respective pairs of opposite edges of the printing screen.
In one embodiment the attachment members each have a length shorter than a length of the respective edge of the printing screen, such that an inward projection of one attachment member does not extend to the ends of the adjacent attachment members.
In another aspect the present invention provides a method of tensioning the above-described printing screen, comprising the steps of engaging tensioning members at the third bends of the attachment members of the printing screen, and outwardly tensioning the tensioning members to tension the printing screen.
In a further aspect the present invention provides a method of fabricating the above-described printing screen, comprising the step of performing a plurality of bending operations to form each attachment member, wherein the first and third bends are formed simultaneously in a single bending operation.
In one embodiment the bending operations in forming each of the respective pairs of attachment members are performed in a single pass through a multi-tool bending machine.
In a yet further aspect the present invention provides a method of fabricating the above-described printing screen, comprising the step of performing a plurality of bending operations to form each attachment member, wherein the first and third bends are formed simultaneously in a single bending operation, and the bending operations in forming the two pairs of attachment members are performed in two passes through a multi- tool bending machine.
Preferred embodiments of the present invention will now be described hereinbelow by way of example only with reference to the accompanying drawings, in which:
Figure 1 illustrates a perspective view of a printing screen in accordance with a preferred embodiment of the present invention;
Figure 2 illustrates a side elevational view along one edge of the printing screen of Figure 1;
Figures 3(a) to (d) illustrate the bending operations in accordance with one embodiment of the present invention in fabricating one of the attachment members of the printing screen of Figure 1;
Figure 4 illustrates a side elevational view along one edge of a printing screen as one modification of the printing screen of Figure 1; and
Figure 5 illustrates a side elevational view along one edge of a printing screen as another modification of the printing screen of Figure 1.
Figures 1 and 2 illustrate a printing screen in accordance with a first embodiment of the present invention.
The printing screen 3 is formed from a single metal sheet, in this embodiment having a thickness of 0.004". In alternative embodiments the printing screen could be formed from a thinner sheet, typically having a thickness of 0.002", or a thicker sheet, having a thickness of 0.006" or greater.
In this embodiment the sheet is a stainless steel sheet. In an alternative embodiment the sheet could be formed of other metal alloys. In a further embodiment the sheet could be plated.
The printing screen 3 comprises a main section 4, in this embodiment of rectangular shape, here square shape, and at least one pair of attachment members 5, 5 at one pair of opposite edges of the printing screen 3, in this embodiment first and second pairs of attachment members 5, 5, 7, 7 at respective pairs of orthogonal edges of the printing screen 3.
The main section 4 includes one or more patterns of printing apertures 8 which define the pattern of deposits to be printed onto a workpiece (not illustrated). The one or more patterns of printing apertures 8 can be formed, for example, by laser cutting or etching, as is well known in the art.
The attachment members 5, 5, 7, 7 each comprise a first bent section 11 which extends inwardly relative to the respective edge of the printing screen 3, defining a first, outer bend 12 at the junction with the main section 4 of the printing screen 3 and enclosing an acute angle with the main section 4 of the printing screen 3, a second bent section 15 which extends outwardly relative to the respective edge of the printing screen 3 along the inner surface of the first bent section 11, defining a second bend 16 at the junction with the first bent section 11 and extending to a location adjacent the inner radius of the outer bend 12, a third bent section 17 which extends inwardly relative to the respective edge of the printing screen 3, defining a third bend 19 at the junction with the second bent section 15 and extending along an inner surface of the main section 4 of the printing screen 3, and a fourth bent section 21 which extends outwardly relative to the respective edge of the printing screen 3, defining a fourth bend 23 at the junction with the third bent section 17. In this embodiment the fourth bent section 21 has a free edge 25, and this free edge 25 is located at a distance from the outer bend 12 which is less than the inward projection X of the second bend 16 along the main section 4 of the printing screen 3.
In this embodiment the second and the third bent sections 15, 17 define a fillet, which, when tensioned in a tensioning frame, is engaged at the inner bend radius of the third bend 19 by a tensioning member 20 of the_ tensioning frame, and is pressed into the inner bend radius of the first bend 12 by the tensioning force F. By virtue of the connection between the second bent section 15 to the first bent section 11 at the second bend 16, the engagement of the tensioning frame at the inner radius of the third bend 19 acts advantageously to restrain the first bent section 11 from being deflected outwardly when under tension.
In this embodiment, as illustrated in Figures 3(a) to (d), the attachment members 5, 5, 7, 7 are each fabricated by first forming the fourth bend 23 (Figure 3(b)), then forming the second bend 16 (Figure 3(c)), and then subsequently simultaneously forming the first and third bends 12, 19 (Figure 3(d)).
In a preferred embodiment the bending operations in forming each of the respective pairs of attachment members 5, 5, 7, 7 are performed in a single pass through a multi-tool bending machine, thereby enabling the two pairs of attachment members 5, 5, 7, 7 to be performed in two passes through the bending machine.
In this embodiment the attachment members 5, 5, 7, 7 each have a length shorter than the length of the respective edge of the printing screen 3.
In one modification, as illustrated in Figure 4, the fourth bent section 21 extends to a location adjacent the inner radius of the third bend 19, and further comprises a fifth bent section 27, which extends inwardly relative to the respective edge of the printing screen 3, defining a fifth bend 29 at the junction with the fourth bent section 21 and extending along an inner surface of the second bent section 15.
In this embodiment the fifth bent section 27 has a free edge 31, and this free edge 31 is located at a distance from the second bend 16 which is less than the inward projection X of the second bend 16 along the main section 4 of the printing screen 3.
In another modification, as illustrated in Figure 5, the fourth bent section 21 is omitted, and the third bent section 21 has a free edge 35, and this free edge 35 is located at a distance from the second bend 16 which is less than the inward projection X of the second bend 16 along the main section 4 of the printing screen 3.
Finally, it will be understood that the present invention has been described in its preferred embodiments and can be modified in many different ways without departing from the scope of the invention as defined by the appended claims.
In one embodiment the sheet could be heat treated, such as by annealing, at least at the edges thereof to facilitate bending of the sheet.
In another embodiment those parts of the sheet which are bent could include weakened zones, such as perforations, to facilitate bending.
In a further embodiment the edges of the sheet or at least those parts which are to be bent could be thinned to facilitate bending.

Claims

1. A printing screen, comprising a main section and at least one pair of attachment members at opposite edges of the printing screen, wherein the attachment members each comprise a first bent section which extends inwardly relative to the respective edge of the printing screen, defining a first, outer bend at a junction with the main section of the printing screen and enclosing an acute angle with the main section of the printing screen, a second bent section which extends outwardly relative to the respective edge of the printing screen along an inner surface of the first bent section, defining a second bend at a junction with the first bent section and extending to a location adjacent the outer bend, and a third bent section which extends inwardly relative to the respective edge of the printing screen, defining a third bend at a junction with the second bent section and extending along an inner surface of the main section of the printing screen.
2. The printing screen of claim 1, further comprising a fourth bent section which extends outwardly relative to the respective edge of the printing screen, defining a fourth bend at a junction with the third bent section.
3. The printing screen of claim 2, wherein the fourth bent section has a free edge which is located at a distance from the outer bend which is less than the inward projection of the second bend along the main section of the printing screen.
4. The printing screen of claim 2, wherein the fourth bent section extends to a location adjacent the third bend, and further comprising a fifth bent section which extends inwardly relative to the respective edge of the printing screen, defining a fifth bend at a junction with the fourth bent section and extending along an inner surface of the second bent section.
5. The printing screen of claim 4, wherein the fifth bent section has a free edge which is located at a distance from the second bend which is less than the inward projection of the second bend along the main section of the printing screen.
6. The printing screen of claim 1, wherein the third bent section has a free edge which is located at a distance from the second bend which is less than the inward projection of the second bend along the main section of the printing screen.
7. The printing screen of any of claims 1 to 6, where formed from a sheet.
8. The printing screen of claim 7, wherein the sheet is a metal sheet, preferably of stainless steel.
9. The printing screen of claim 7 or 8, wherein the sheet has a thickness of not more than about 0.006".
10. The printing screen of claim 9, wherein the sheet has a thickness of not more than about 0.005".
11. The printing screen of claim 9, wherein the sheet has a thickness of not more than about 0.004".
12. The printing screen of any of claims 1 to 11, comprising first and second pairs of attachment members at respective pairs of opposite edges of the printing screen.
13. The printing screen of claim 12, wherein the attachment members each have a length shorter than a length of the respective edge of the printing screen, such that an inward projection of one attachment member does not extend to the ends of the adjacent attachment members.
14. A method of tensioning the printing screen of any of claims 1 to 13, comprising the steps of engaging tensioning members at the third bends of the attachment members of the printing screen, and outwardly tensioning the tensioning members to tension the printing screen.
15. A method of fabricating the printing screen of any of claims 1 to 13, comprising the step of performing a plurality of bending operations to form each attachment member, wherein the first and third bends are formed simultaneously in a single bending operation.
16. The method of claim 15, wherein the bending operations in forming each of the respective pairs of attachment members are performed in a single pass through a multi-tool bending machine.
17. A method of fabricating the printing screen of claim 12 or 13, comprising the step of performing a plurality of bending operations to form each attachment member, wherein the first and third bends are formed simultaneously in a single bending operation, and the bending operations in forming the two pairs of attachment members are performed in two passes through a multi-tool bending machine.
PCT/EP2011/001632 2010-04-01 2011-03-31 Printing screen and method of manufacturing the same WO2011120700A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US32009610P 2010-04-01 2010-04-01
US61/320,096 2010-04-01

Publications (3)

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WO2011120700A2 true WO2011120700A2 (en) 2011-10-06
WO2011120700A9 WO2011120700A9 (en) 2011-12-22
WO2011120700A3 WO2011120700A3 (en) 2012-05-31

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2420033R1 (en) * 2012-01-26 2013-12-16 Ibil Laser S L Screen printing for surface mounting devices

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003093012A1 (en) 2002-05-02 2003-11-13 Tannlin Limited Printing screens, frames therefor and printing screen units

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Publication number Priority date Publication date Assignee Title
GB327656A (en) * 1929-07-29 1930-04-10 Roneo Ges Mit Beschrankter Han Improved means for attaching stencil sheets to duplicating machines
DE20209385U1 (en) * 2002-06-17 2002-08-29 Ltc Laserdienstleistungen Gmbh template
EP1651019B1 (en) * 2004-10-25 2008-05-14 METAQ GmbH Stencil, frame to stretch said stencil as well as process and device to manufacture stencil

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003093012A1 (en) 2002-05-02 2003-11-13 Tannlin Limited Printing screens, frames therefor and printing screen units

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2420033R1 (en) * 2012-01-26 2013-12-16 Ibil Laser S L Screen printing for surface mounting devices
EP2807906B1 (en) * 2012-01-26 2018-11-21 Ibil Laser S.L. Printing screen for surface mount devices

Also Published As

Publication number Publication date
WO2011120700A9 (en) 2011-12-22
WO2011120700A3 (en) 2012-05-31

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