Classifications

• • 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
  • H05K3/14—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 spraying techniques to apply the conductive material, e.g. vapour evaporation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
  • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
  • B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
  • B05B13/0431—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation with spray heads moved by robots or articulated arms, e.g. for applying liquid or other fluent material to three-dimensional [3D] surfaces
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
  • B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
  • B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
  • B05B17/0607—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
  • B05B5/08—Plant for applying liquids or other fluent materials to objects

Definitions

• the invention is based on a method according to the type of the main claim. So far layers of baked-on solids, e.g. B. conductive layers such as conductor tracks, applied by hand with a brush, by pad printing or by screen printing on substrates made of ceramic or glass. Such methods are sometimes cumbersome and not very efficient, sometimes they are difficult to automate and not flexible, they leave little room for individual design.
• - Printers based on the inkjet principle are known from data processing, which produce droplets from a homogeneous liquid with the aid of the piezo effect. In the case of packaging machines, packs are labeled with systems that work on the ink-jet principle.
• the inventive method with the characterizing features of the main claim and the device according to the invention with the characterizing features of claim 11 have the advantage that ceramic or glass parts can be precisely coated with a defined coating.
• the process is very flexible and easy to automate and is therefore suitable for both laboratory and mass production. It can be used in numerous applications, such as applying conductor tracks on ceramic plates or on glass, producing conductor tracks in small series, applying conductor tracks on foils, applying all types of cover layers; finally, the use of baked-in dyes makes it possible to label and decorate technical articles or everyday items made of porcelain or glass as well as tiles.
• FIG. 1 shows a schematic diagram of the entire device and FIGS. 2 to 4 show three exemplary embodiments of the spraying device in section.
• the device for performing the method according to the invention is shown in principle.
• the device consists of a handling device or small robot 1, on the swivel arm 2 of which the workpiece 3 to be coated is fastened.
• a sprayer 4 is set up in a suitable position and is connected via a pipeline 5 to a reservoir 6 for the suspension.
• a control device 7 in the form of a programmable computer is connected via a control line 8 to the small robot 1, which brings about the necessary movements of the workpiece 3.
• the intensity of the spraying process is controlled via a further control line 9 to the spraying device 4.
• FIG. 2 shows an embodiment of the spraying device 4 with the storage container 6 connected.
• the spraying device 4 consists of a nozzle 10 and a cavity 11 which has a piezo plate 12 as a wall.
• the pulse plate 12 is supplied with voltage pulses via electrical lines (not shown), the frequency of which, which is controlled by the control unit 7, determines the intensity of the coating.
• the frequency is e.g. B. at 100 Hz.
• the drop size depends essentially on the level of the applied voltage, is generally set once, the voltage being in the range between 100 and 500 V.
• the cavity 11 is closed Feeding part 13 to which the connecting line 5 between the spraying device 4 and the storage container 6 is connected.
• either the storage container 6 is equipped with a stirrer 1 k or a bypass line 15 is located between the feed part 13 and the container 6 in order to continuously pump the suspension around. In this case there is a pump 16 in line 5.
• both measures namely stirrer 14 and bypass line 15, can also be present.
• the suspension is continuously pumped around by means of the pump 16, the suspension being pressed through the nozzle 10 and injected into an opposite return opening 17, from where it again arrives in the storage container 6. If part of the suspension is used for coating, it is divided into droplets in the manner described above by the piezo plate 12, but at the same time the droplets are charged in the electric field of the electrodes 18 and deflected in a further electric field of the baffle plates 19, so that the droplets no longer fly into the return opening 17, but instead as deflected droplets 20 onto the substrate 3.
• FIG. K A third embodiment is shown in FIG. K, in which the suspension is not broken up into individual droplets by means of a piezo plate, but rather by means of a valve 21 which closes and opens at short intervals and which is preferably controlled magnetically.
• a certain pressure of the suspension is necessary, which can be generated either as a gas pressure in the storage container or by a pump.
• also at This embodiment ensures a constant movement of the suspension by means of stirrer 14 and / or pump 16 and bypass line 15.
• the suspensions can be those of metals, for example of platinum, in order to apply conductor tracks or other conductive coatings to ceramic or glass.
• Commercially available platinum pastes or platinum powder are diluted with commercially available thinners to such an extent that the viscosity of the suspensions is in the range from 0.001 to 0.1 Pa. s lies.
• the most favorable setting of the viscosity also depends on the dimensioning of the nozzle, which normally has an inside diameter of 50 to 100 ⁇ m. The optimization of the ratio of nozzle diameter to viscosity must therefore be determined by experiment.
• the ceramic or glass substrates are baked at a temperature suitable for the particular solid.

Landscapes

• Engineering & Computer Science (AREA)
• Robotics (AREA)
• Manufacturing & Machinery (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Spray Control Apparatus (AREA)
• Electrostatic Spraying Apparatus (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6245762

Family Applications (1)

Country Status (4)

Cited By (11)

Families Citing this family (9)

Citations (4)

Family Cites Families (1)

• 1984
  • 1984-09-19 DE DE19843434334 patent/DE3434334A1/de active Granted
• 1985
  • 1985-08-29 WO PCT/DE1985/000292 patent/WO1986001747A1/de unknown
  • 1985-08-29 EP EP19850904232 patent/EP0194272A1/de not_active Withdrawn
  • 1985-09-19 ES ES547114A patent/ES8701053A1/es not_active Expired

Patent Citations (4)

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