EP1392509A1 - Method and device for producing a screen printing stencil for application of adhesive - Google Patents
Method and device for producing a screen printing stencil for application of adhesiveInfo
- Publication number
- EP1392509A1 EP1392509A1 EP02743090A EP02743090A EP1392509A1 EP 1392509 A1 EP1392509 A1 EP 1392509A1 EP 02743090 A EP02743090 A EP 02743090A EP 02743090 A EP02743090 A EP 02743090A EP 1392509 A1 EP1392509 A1 EP 1392509A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- screen printing
- wall
- template blank
- radiation source
- radiation
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/26—Perforating by non-mechanical means, e.g. by fluid jet
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/006—Patterns of chemical products used for a specific purpose, e.g. pesticides, perfumes, adhesive patterns; use of microencapsulated material; Printing on smoking articles
-
- 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
- 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
- B41C1/145—Forme preparation for stencil-printing or silk-screen printing by perforation using an energetic radiation beam, e.g. a laser
Definitions
- the invention relates to a method and a device for producing a screen printing stencil for applying adhesive to a surface to be coated, the through-openings through which the adhesive passes being produced by means of an energy-rich beam, in particular a laser beam.
- the material to be applied for example printing ink
- the material to be printed is applied to the material to be printed through openings in a printing stencil or printing form.
- a widely used variant of the printing process is the so-called screen printing.
- the liquid material to be applied is applied through openings in the screen or the screen printing stencil to a surface to be coated. This can be done manually, but also mechanically in flat form or rotary screen printing machines.
- the screen printing process is also particularly suitable for applying adhesives to surfaces to be coated.
- Conventional screen printing stencils for adhesives are made from electroplated nickel.
- nickel material is deposited on a copper body in a galvanic process until a cylindrical screen printing stencil with a thin wall is created.
- the screen printing stencil made of nickel has a large number of passage openings, the diameters and the distances between the passage openings being fixed after the electrodeposition.
- screen printing stencils for applying adhesive which are produced by electroplating, have considerable disadvantages.
- the galvanically separated materials are thermal resilient up to a certain temperature, which in many cases lies below the processing temperature of the adhesive to be applied, ie at the temperature at which the adhesive has the desired processing viscosity.
- Electroplated screen printing stencils for applying adhesive are often damaged or even destroyed in the case of adhesives with high processing temperatures due to the excess temperatures required to reach the processing temperature of the adhesive. For this reason, galvanic screen printing stencils, especially screen printing stencils made of nickel, are not suitable for applying adhesives with relatively high processing temperatures.
- the invention provides a method for producing a screen printing stencil with the following steps, namely turning a cylindrical stencil blank, which has a thin wall made of thermally resilient material, around a longitudinal axis, irradiating the rotating stencil blank with a high-energy beam in places to melt the wall,
- An advantage of the method according to the invention for producing a screen printing stencil is that the arrangement, the diameters and the distances between the passage openings can be produced flexibly in accordance with the desired adhesive pattern to be applied.
- the rotating template blank is irradiated with a laser beam.
- the rotating template blank is irradiated with an electron beam.
- the melt jet is preferably emitted by a radiation source, the position of which relative to the rotating cylindrical template blank is controlled by a control unit.
- the radiation power of the melt jet emitted by the radiation source is preferably set by a further control unit.
- the melt jet is emitted in pulsed form from the radiation source.
- the radiation power, the pulse duration of the radiation pulses and the number of radiation pulses which are emitted by the radiation source for melting the wall for a passage opening are preferably set by the control unit depending on a desired nominal diameter of the passage opening.
- the passage openings are preferably made such that they are arranged hexagonally on the cylinder surface.
- the distance between the hexagonally arranged passage openings is preferably set by the control unit.
- the pressurized pressurized gas emerges from a pressurized gas outlet opening and is directed onto the molten point of the template blank in order to pierce the wall.
- the cylindrical template blank is preferably made of a metal.
- the template blank is preferably degreased and cleaned before irradiation.
- the cylindrical one Template blank clamped at one end in a clamping device and pneumatically fixed.
- the focal point of the melt jet is preferably set manually.
- the radiation source is moved parallel to the longitudinal axis from the clamping device to the other end of the cylindrical template blank when the template blank is irradiated.
- the radiation power of the radiation source is measured by a measuring device and the radiation source is subsequently cleaned if the measured radiation power is below a predetermined minimum power.
- the invention also provides a device for producing a screen printing stencil with a clamping device for clamping a cylindrical stencil blank with a thin wall, which is rotatably mounted along its longitudinal axis, a movable radiation source which emits a melt jet for melting the wall at points, and with an outlet opening through which a pressurized gas is emitted for piercing the molten wall locations of the stencil blank.
- the production device preferably has a first control unit which controls the relative position of the radiation source to the template blank and the rotational speed at which the template blank is rotated.
- the manufacturing device preferably also has a second control unit, which controls the radiation power, the pulse duration of the radiation pulses and the number of radiation pulses which are emitted by the radiation source for melting the wall for a passage opening.
- the invention also provides a screen printing stencil for applying adhesive to a wall, which has a multiplicity of through-openings through which liquid adhesive is dispensed to a surface to be coated, the wall consisting of a thermally resilient material.
- the wall of the screen printing stencil according to the invention consists of stainless steel.
- the wall of the screen printing stencil according to the invention consists of a thermally resilient plastic.
- the passage openings of the screen printing stencil according to the invention are preferably arranged hexagonally.
- the wall of the screen printing stencil according to the invention preferably has a wall thickness between 75 and 400 ⁇ m.
- the screen printing stencil is cylindrical.
- FIG. 1 shows a device for producing a screen printing stencil according to the invention
- Fig. 2 shows an arrangement of through openings in the screen printing stencil according to the invention.
- Fig. 1 shows an arrangement for explaining the manufacturing process of a screen printing stencil according to the invention.
- a cylindrical template blank 1 is clamped at one end in a clamping device 2.
- the template blank 1 consists of a thermally resilient material, for example a thermally resilient metal or a thermally resilient plastic.
- the template blank has a relatively small wall thickness of preferably 75-400 ⁇ m.
- the length L of the cylindrical template blank 1 depends on the desired application width of the adhesive on the material to be printed.
- the diameter D of the cylindrical template blank 1 depends on the manner in which the adhesive to be applied is pressed or pressed by the template blank 1 during the application.
- the template blank 1 can be made in different ways.
- the template blank 1 can either be bent from a flat sheet metal, in which the two ends are welded to one another, the cylinder being put on a mandrel and rolled in order to eliminate the weld seam which arises in the process.
- the template blank is produced by placing a drawn or cast tube on a mandrel and also rolling it. In both cases, the rolling process is carried out until the desired wall thickness w is reached.
- the cylindrical template blank 1 clamped in the clamping device 2 is rotated about its longitudinal axis A at an adjustable rotational speed.
- the rotational speed is controlled by a first control unit 3, which controls the tensioning device 2 via a control line 4.
- the first control unit 3 also controls, via a control line 5, a servomotor 6 for a holder 7, which has a radiation source 8 and an outlet nozzle 9.
- the control unit 3 controls the relative position of the holder 7 to the rotating cylindrical template blank 1.
- the holder 7 is preferably movable in three planes x, y, z by the controlled motor 6.
- the radiation source 8 is a radiation source for emitting high-energy radiation, which is directed from the radiation source 8 onto the rotating surface of the rotating stencil blank.
- the radiation source 8 is preferably a laser radiation source.
- the radiation source 8 is an electron beam source.
- the radiation source is controlled by a further control unit 11 via a control line 10.
- the radiation emitted by the radiation source 8 is preferably pulse-shaped, the control unit 11 setting the radiation power and the pulse duration of the radiation pulses.
- the control unit 11 also sets the number of radiation pulses which are to be emitted by the radiation source 8 in order to melt the wall of the template blank 1 in order to produce a passage opening.
- the radiation power, the pulse duration of the radiation pulses and the number N of radiation pulses emitted within a pulse group for producing a passage opening are set as a function of a desired nominal diameter of the passage opening.
- the laser beam source 8 is preferably a solid-state laser, such as is used for welding and cutting in various industrial applications.
- the laser radiation source preferably has the following performance data.
- the minimum output power is about 50 watts, the radiation quality is about 10 mm x mrad and the minimum necessary pulse power is about 3 kW.
- the output power of the laser radiation source in the manufacturing device according to the invention is 75 watts.
- the necessary pulse duration of the radiation pulses can be reduced, so that the machining process is shortened overall.
- Small and medium-sized openings with a diameter between 100 and 400 ⁇ m are generated by radiation pulses.
- a pulse duration of 0.02 s approximately 15-30 laser radiation pulses per passage opening are required, depending on the desired diameter, in order to open a passage within a period of approximately 0.3 to 0.5 s to create.
- the radiation source 8 emits a permanent laser beam onto the surface of the template blank 8.
- the bracket 7 is moved such that a Circle is cut into the surface of the template blank 1.
- the high-energy melt jet emitted by the radiation source 8 leads to a melting of the wall of the template blank 1.
- the actual passage opening 12 on the cylinder surface of the template blank 1 is created by means of a pressurized gas or shot gas which is emitted from the outlet opening 9 within the holder 7.
- the pressurized pressurized gas is located in a container 13, which is connected to the outlet opening or outlet nozzle 9 via a controllable valve 14 and a feed pipe 15.
- the valve 14 is controlled by a further control unit 17 via a control line 16.
- the valve 14 on the control unit 17 is opened so that the pressurized gas under high pressure is directed through the outlet opening 9 at a relatively high pressure parallel to the melt jet generated onto the surface of the stencil blank 1.
- the air jet and the laser beam are either congruent or slightly offset at the same point.
- the compressed gas can be any gases, such as nitrogen or compressed air. While compressed air is particularly inexpensive, nitrogen is distinguished by the fact that fewer charred residues form at the hole edge of the passage openings. Furthermore, compressed air is preferably used only with a stencil material that is largely insensitive to oxygen.
- the holder 7 can preferably be moved in three directions x, y, z. Furthermore, the rotation of the template blank 1 is controlled by the control unit 3.
- the passage openings 12 can be produced in any pattern and at any distance from one another. To- In principle, it is possible to individually adjust the diameters of the various passage openings 12 by controlling the radiation source 8.
- the template blank 1 heats up and there is a thermal expansion.
- the holder 7 is moved to the end of the template blank 1 in the vicinity of the clamping device 2 after manual adjustment of the radiation focal point.
- the radiation source 8 is then activated by the control unit 11, and the pulse-shaped laser radiation strikes the surface of the template blank 1.
- the radiation source is moved away from the clamping device 2 under the control of the control unit 3. This makes it possible to take into account the thermal expansion of the stencil material when creating further openings.
- the control unit 11 contains an internal payer and pays the number of passage openings generated. After a certain number of through openings have been generated, for example 100 rows of through openings produced, the laser optics moves to a measuring surface next to the template blank 1 and emits a few radiation pulses. The radiation intensity of the emitted pulses is measured by a measuring device and compared with a target value by the control unit 11. If the measured value does not lie within a predetermined tolerance range, the control unit 11 reports a malfunction, which is usually caused by combustion residue. After the combustion residues have been eliminated, the irradiation process is continued. During the cleaning process, some of the passage openings last produced are preferably measured by measuring optics and their diameters are compared with the desired nominal diameters.
- the through openings 12 can be provided by the manufacturing device according to the invention in any pattern of the screen printing stencil.
- the passage openings 12 are arranged hexagonally on the surface of the screen printing stencil.
- Fig. 2 shows such a hexagonal arrangement.
- Each passage opening 12 is surrounded by six further passage openings.
- the surrounding passage openings are always at the same distance from the passage opening 12 located in the center.
- the hexagonal arrangement continues along the cylinder surface.
- the distance between the passage openings 12 is adjustable.
- the manufacturing device according to the invention can be used to set how many through openings are arranged over a length of one inch, ie 25.4 mm.
- the usual unit for specifying the number of through openings per inch is the so-called “mesh”, values of 5 to 30 mesh being common for the number of through openings, for example in textile coatings. Larger mesh numbers, for example in a range of 30-130 mesh, are possible for certain technical applications.
- the larger the mesh number the smaller the diameter of the through openings and thus the amount of adhesive applied to the surface.
- the screen printing stencil produced by the manufacturing method according to the invention is suitable for applying any ger adhesives on any surface.
- the adhesive is partially applied to the surface.
- the resulting coating image or adhesive print image generally consists of hemispherical adhesive dots. However, other geometric patterns, such as diamonds, can also be created.
- the adhesive is conventionally fed to the coating machine as a composite material.
- the composite material consists of an outer material made of paper, plastic, metal, textile, non-woven material, filter material, foam or the like, the adhesive layer being applied to the outer material.
- the adhesive is also covered by a so-called carrier material, which is peeled off when the composite material is processed. For this purpose, the surface of the carrier material is non-stick coated to form the adhesive.
- the screen printing stencil produced with the method according to the invention is suitable for applying hot-melt adhesives available on the market which are non-tacky when cold.
- the screen printing stencil according to the invention is suitable for applying hotmelt PSAs that are sticky at room temperature.
- hotmelt PSAs that are sticky at room temperature.
- cold acrylate systems can also be applied. These are post-crosslinked or hardened with UV or electron radiation.
- the type of adhesive, the necessary adhesive strength and the application weight of the adhesive are determined based on the application.
- the necessary diameters of the through openings 12 are calculated by a process computer.
- the control unit 11 controls the radiation source 8 to generate a laser beam signal.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Pest Control & Pesticides (AREA)
- Forests & Forestry (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Textile Engineering (AREA)
- Printing Plates And Materials Therefor (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10125598 | 2001-05-25 | ||
DE2001125598 DE10125598A1 (en) | 2001-05-25 | 2001-05-25 | Method and device for producing a screen printing stencil for applying adhesive |
PCT/EP2002/005736 WO2002094567A1 (en) | 2001-05-25 | 2002-05-24 | Method and device for producing a screen printing stencil for application of adhesive |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1392509A1 true EP1392509A1 (en) | 2004-03-03 |
Family
ID=7686171
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02743090A Withdrawn EP1392509A1 (en) | 2001-05-25 | 2002-05-24 | Method and device for producing a screen printing stencil for application of adhesive |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1392509A1 (en) |
DE (1) | DE10125598A1 (en) |
WO (1) | WO2002094567A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011105739A1 (en) | 2011-06-24 | 2012-12-27 | Baumer Hhs Gmbh | Method for preparation of self-adhesive labels, involves synchronizing partial coating of adhesive on label web and/or substrate sheet relatively to position of labels on mostly constant current label web |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3981237A (en) * | 1973-02-21 | 1976-09-21 | Rhodes John M | Plastic rotary printing screens construction method therefor |
US5334815A (en) * | 1992-01-15 | 1994-08-02 | Wear Guard Corp. | Apparatus and method for producing a printing screen |
US5338627A (en) * | 1992-05-22 | 1994-08-16 | Think Laboratory Co., Ltd. | Method for manufacturing rotary screen |
EP0671261B1 (en) * | 1994-02-02 | 1998-05-06 | Schablonentechnik Kufstein Aktiengesellschaft | Method and apparatus for the preparation of a printing screen |
TW289901B (en) * | 1994-12-28 | 1996-11-01 | Ricoh Microelectronics Kk | |
DE19503983A1 (en) * | 1995-02-07 | 1996-08-08 | Koenen Gmbh | Laser-perforated metal mask prodn. esp. for SMD technology |
DE19840926B4 (en) * | 1998-09-08 | 2013-07-11 | Hell Gravure Systems Gmbh & Co. Kg | Arrangement for material processing by means of laser beams and their use |
MY133638A (en) * | 1999-10-18 | 2007-11-30 | Stork Screens B V A Dutch Company | Printing forme for rotary screen printing made from fibre-reinforced plastics material |
-
2001
- 2001-05-25 DE DE2001125598 patent/DE10125598A1/en not_active Ceased
-
2002
- 2002-05-24 WO PCT/EP2002/005736 patent/WO2002094567A1/en not_active Application Discontinuation
- 2002-05-24 EP EP02743090A patent/EP1392509A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO02094567A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE10125598A1 (en) | 2002-12-12 |
WO2002094567A1 (en) | 2002-11-28 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 20031215 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
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AX | Request for extension of the european patent |
Extension state: AL LT LV MK RO SI |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: LEHNER, THOMAS Inventor name: LEHNER, MANFRED |
|
17Q | First examination report despatched |
Effective date: 20040323 |
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GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 19980414 |