EP0590164B1 - Procédé et dispositif pour fabriquer des matrices d'impression par stencil - Google Patents

Procédé et dispositif pour fabriquer des matrices d'impression par stencil Download PDF

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Publication number
EP0590164B1
EP0590164B1 EP92116181A EP92116181A EP0590164B1 EP 0590164 B1 EP0590164 B1 EP 0590164B1 EP 92116181 A EP92116181 A EP 92116181A EP 92116181 A EP92116181 A EP 92116181A EP 0590164 B1 EP0590164 B1 EP 0590164B1
Authority
EP
European Patent Office
Prior art keywords
screen
nozzle
liquid
nozzles
spraying
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
EP92116181A
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German (de)
English (en)
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EP0590164A1 (fr
Inventor
Hans Fischer
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.)
Schablonentechnik Kufstein GmbH
Original Assignee
Schablonentechnik Kufstein 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
Priority to ES95119508T priority Critical patent/ES2141881T3/es
Application filed by Schablonentechnik Kufstein GmbH filed Critical Schablonentechnik Kufstein GmbH
Priority to AT95119508T priority patent/ATE188167T1/de
Priority to ES92116181T priority patent/ES2095994T3/es
Priority to DE59207684T priority patent/DE59207684D1/de
Priority to AT92116181T priority patent/ATE146127T1/de
Priority to EP95119508A priority patent/EP0714766B1/fr
Priority to DE59209787T priority patent/DE59209787D1/de
Priority to EP92116181A priority patent/EP0590164B1/fr
Publication of EP0590164A1 publication Critical patent/EP0590164A1/fr
Application granted granted Critical
Publication of EP0590164B1 publication Critical patent/EP0590164B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • 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
    • B41C1/147—Forme preparation for stencil-printing or silk-screen printing by imagewise deposition of a liquid, e.g. from an ink jet; Chemical perforation by the hardening or solubilizing of the ink impervious coating or sheet

Definitions

  • the invention relates to a method for producing printing stencils according to the preamble of patent claim 1 and to a device for producing printing stencils according to the preamble of patent claim 16.
  • the printing stencils mentioned are usually thin sieves which are flat or cylindrical and have a pattern which is usually carried out in printing ink-resistant lacquer. It is known to produce such stencils by coating the screens with light-sensitive varnishes, exposing these so-called photoresists with a pattern and then developing them. A distinction is made between negative and positive varnishes, depending on whether the exposed areas have remained after development or have been removed by the development process. The exposure can take place in a conventional manner via a large film or can be projected on using optics. It is also known to coat the screens with an easily evaporable lacquer and then to remove this lacquer thermally or photolytically with a focused laser beam.
  • EP-A-0 492 351 it is also known to first provide a cylindrical screen completely with an unexposed emulsion layer in order to produce flat printing stencils, and to print a pattern on this unexposed emulsion layer, for example with the aid of an inkjet printer. The entire layer is then exposed using the printed pattern as an exposure mask. Then it is developed.
  • the invention has for its object to overcome the disadvantages mentioned above and to provide a method for the production of stencils in which no more polluting substances fall off.
  • the process steps required to produce the printing stencils and the amount of material required to form the cover layer should also be reduced to a minimum.
  • the aim of the invention is also to provide a device suitable for carrying out this method.
  • a method for producing printing stencils in which a cover layer is applied to a fine-meshed screen, is characterized according to the invention in that the cover layer using at least one nozzle and in accordance with a desired one Print pattern is only sprayed onto the screen in certain areas.
  • the covering liquid required to form the covering layer is only applied to the screen at those points where the printing was not required.
  • the areas of the screen required for printing remain free, so that here the hydraulic fluid can emerge freely from the inside of the screen.
  • the method manages with a minimum of covering liquid, so that it can be carried out relatively inexpensively. It is no longer necessary, as in the conventional case, to remove the covering layer in regions after it has been applied to the sieve, so that the method according to the invention is also extremely environmentally friendly and time-saving.
  • the sieves mentioned can be flat sieves or cylindrical sieves.
  • these can e.g. B. be covered across the country in the manner of a meander to apply the cover layer at the desired locations on the screen.
  • flat sieves can also be converted into cylindrical sieves by wrapping them around a circular cylindrical die.
  • Sieves in cylindrical form are preferably used, the covering layer being sprayed on when the sieve is rotated about its cylinder axis and with the nozzle being displaced parallel to the cylinder axis.
  • the rotational position of the printing stencil and the position of the nozzle in the axial direction are constantly registered in order to be able to determine positions on the cylinder surface at which material is to be sprayed on in accordance with a desired printing pattern to form the cover layer or not.
  • the cover layer is sprayed onto the screen in a direction that is inclined with respect to the normal to the screen surface at the point of impact.
  • the covering material is thereby prevented from passing through pores of the sieve, since there is always a material wall in the direction of the trajectory of the covering material.
  • the direction of rotation of the screen can be chosen so that the relative speed between the screen surface and the cover material when spraying is as small as possible to prevent the drops of cover material from being sprayed upon impact to prevent the screen surface.
  • the material of the cover layer is sprayed out of the nozzle in a direction which is at least approximately parallel to the force of gravity.
  • a plurality of nozzles can be provided in order to spray cover material onto one and the same point on the screen surface.
  • the respective point can be sprayed through all nozzles at the same time or at different times.
  • a thicker cover layer can thus be produced in a simple manner, since one and the same point on the screen surface is coated several times, according to the number of nozzles.
  • a plurality of liquids can be applied simultaneously to the screen surface to form the cover layer, and can then react with one another to produce the cover layer.
  • epoxy resin components that are only converted into a gel state after they have been mixed together and the crosslinking reaction has begun.
  • the individual epoxy resin components are relatively thin, so that rapid droplet separation takes place within the nozzles and the nozzles can therefore have a relatively short jet length.
  • these components are converted into a gel state as a result of the crosslinking reaction after striking the screen surface, there is no danger that they will be flung off the surface again.
  • the use of the multiple components is also advantageous in that a better edge sharpness of the pattern is obtained.
  • the cover layer can also be formed by spraying on a viscous liquid which is, for example, an aqueous emulsion of a synthetic resin varnish or can be an aqueous suspension of pigments. It has proven to be advantageous to carry out the spraying on of the liquid accompanied by a laminar gas stream surrounding it, for example using an air or inert gas stream, in order to accelerate the drying process of the sprayed-out liquid.
  • the gas flow also prevents small secondary droplets from accumulating inside the nozzles and otherwise contaminating them.
  • the speed of the laminar gas flow can also be selected so that liquid drops once formed can no longer approach each other on their way to the screen surface, as a result of which the formation of larger drops can be avoided.
  • the laminar gas stream can also have an elevated temperature compared to the ambient temperature, as a result of which the sprayed out can dry Fluid can accelerate even further.
  • the screen can also be heated at least at the point of impact of the liquid, for example by means of a heat radiator, in order to obtain a solid covering layer on the screen surface as quickly as possible. Warm air can also be blown axially into the interior of the sieve. It is also possible to irradiate the liquid drops sprayed onto the sieve with ultraviolet (UV) radiation in order to start or accelerate the crosslinking reaction earlier, which leads to an even better edge definition of the pattern (UV hardening). The short phase of lowering the viscosity, which occurs during heating, is therefore avoided with pure UV curing.
  • UV ultraviolet
  • a device for performing the method with a processing station known per se, the at least one bearing device for the front-side mounting of a hollow cylindrical screen, a drive device for rotating the screen about its cylinder axis, a processing table movable parallel to the cylinder axis and a control device for controlling the drive device, the Transport of the processing table and for controlling a tool station arranged on the processing table is characterized according to the invention in that the tool station consists of at least one nozzle suitable for ejecting liquid, which is oriented in such a way that it sprays the liquid onto the screen in one direction , which is inclined to the normal of the screen surface at the point of impact.
  • This nozzle receives electrical ejection signals from the control device, in accordance with a predetermined pattern and depending on the rotational position of the screen cylinder and the position of the processing table.
  • the pattern or print pattern can be pre-stored in electronic form in an electronic memory of the control device.
  • Each saved sample point is assigned a pair of values that contains the rotary position of the screen cylinder (angular position) and the axial position of the machining table. As soon as this pair of values is supplied to the control device by sensors, the assigned value of the pressure pattern is read out of the named electronic memory and used to form an ejection signal which is transmitted to the nozzle.
  • the control device If there are several nozzles lying side by side on the processing table in the longitudinal direction of the cylinder, and if these nozzles act on different areas of the screen cylinder, the control device outputs the electrical ejection signals for the respective transport direction of the processing table nozzle located further to the rear with a time delay, in such a way that one and the same point on the screen surface is sprayed in succession through the respective nozzles.
  • FIG. 1 A first exemplary embodiment of a device according to the invention is shown in FIG. 1.
  • Reference number 1 denotes a rotating sieve in the shape of a cylinder, to which paint or varnish is applied as a covering liquid through one or more nozzles.
  • a jet 3 of the covering liquid sprayed out of the nozzles 2 is controlled by means of a computer 4 so that the covering liquid is applied to the sieve 1 only at those points at which the sieve 1 is covered due to the pattern must be and those parts of the sieve 1 remain uncovered where it should remain permeable.
  • the sieve 1 is received between two synchronously driven end heads 5 and set in rotating motion (direction of rotation D).
  • the right end head 5 can, for example, be displaced in the direction of the cylinder axis of the circular screen 1.
  • the sieve 1 is placed between the right and left end heads 5 and the right end head 5 is brought up to the sieve 1.
  • the screen 1, which is usually very thin and light, can possibly be set in rotation by the axially acting clamping force and the friction between the screen 1 and the left driven end head 5.
  • the rigidity of the screen 1 is always sufficient to notify the right end head 5 of the rotational movement via the acting frictional forces, if only the speed of the screen 1 is increased so slowly that the required acceleration torque does not overwhelm the transmission capacity of the circular screen 1.
  • Both end heads 5 are rotatably mounted on pedestals 6, the pedestals 6 being arranged on a machine bed 7. To guide the right pedestal 6 in Figure 1 guide rods 8 are available, the z. B. can be attached to the machine bed 7.
  • the left end head 5 is driven by a motor 9 and a belt 10.
  • This belt 10 spans a drive wheel 11 which is fixed on an axis 12 which carries the left end head 5.
  • an incremental pulse generator 13 which determines the rotational position of the axis 12 or the sieve 1 and outputs corresponding signals S D to the computer 4.
  • the nozzles 2, which are fastened on a processing table 14, are slowly advanced in the direction of the cylinder axis 1b of the sieve 1, so that a thin jet of droplet and consisting of masking liquid, which emerges from the nozzles 2, is very low along a helix Slope hits the sieve 1.
  • the feed table is impressed on the processing table 14 via a spindle 15, this spindle 15 being driven for this purpose via a stepper motor 16, which also receives its step signals S T from the computer 4.
  • step signals S T are converted into power pulses P T by a driver stage 17.
  • the rotation of the motor axis of the stepping motor 16 is transmitted to the spindle 15 via a belt 18 and a pulley 19. This extends through the processing table 14, which in turn is guided on guide rails 20 on the machine bed 7.
  • the nozzles 2 must be supplied with a covering liquid suitable for the subsequent printing process.
  • they are connected to small pressure vessels 21 via supply lines 22.
  • the covering liquid is under a slight excess pressure of approximately 1 to 5 bar.
  • a separate pressure container 21 will be provided for each nozzle 2, since differences in the line resistances and the need to be able to regulate the application quantity separately per nozzle 2 cause different outlet pressures of the covering liquid.
  • Each nozzle 2 also has a not inconsiderable amount of unused covering liquid which has to be continuously sucked off and conveyed back.
  • vacuum tanks 23 are provided, into which the unused covering liquid is returned via return lines 24 due to the negative pressure prevailing in these tanks.
  • the recirculated cover liquid which has lost diluent as a result of the process which has passed through, can in turn be supplied to the application process as a cover liquid after preparation.
  • the nozzles 2 are arranged several times, in the present case twice. They are spaced apart from one another in the direction of the cylinder axis 1b or template axis in order to give the covering liquid time to dry at least slightly before the second application. This drying can be supported by blowing warm air, or by generating appropriate heat radiation.
  • a correspondingly designed heating device H can be mounted on the processing table 14.
  • the liquid can also be cured alone or additionally by UV radiation, as already mentioned, so that in this case there is also a UV light source (for example a mercury vapor lamp) on the processing table 14.
  • the nozzles 2 can also be displaced in the circumferential direction of the cylinder 1 or sieve, but this leads to a more difficult handling of the coating process if successive circular sieves 1 of different diameters are to be coated.
  • the nozzles 2 are preferably designed as electrostatic nozzles, each of which is supplied with a control signal S 1 , S 2 from the computer 4 in order to spray out the covering liquid when a control signal is received.
  • FIG. 2 shows a device that is basically the same as in FIG. 1, the same elements being provided with the same reference numerals.
  • the processing table 14 is mounted on a rear support wall 25 on guide rails 26 in the axial direction of the cylinder 1.
  • the spindle 15 and the stepping motor 16 with spindle drive 18 and 19 are also fastened to this rear guide wall 25.
  • the nozzle openings 28 point downward.
  • the covering liquid is applied in very fine drops in order to achieve a sufficiently high resolving power when generating the print pattern on the surface of the screen 1.
  • the liquid can have a high viscosity in order to be able to carry a sufficient proportion of solid substance with a relatively small droplet size.
  • several liquid components can also be sprayed on separately through different nozzles, which are combined at one point on the surface of the sieve 1. These can be different epoxy resin components which are only converted into a gel state when a crosslinking reaction has started after their meeting.
  • the method only makes sense if a very high drop frequency can be achieved.
  • electrostatically acting nozzles in which a liquid jet is regularly broken down into drops by a very high-frequency vibration, for example a pipe wall, and in which the drops are then electrically charged and deflected or, depending on the charge state, in an electrostatic field not be distracted.
  • nozzles of this type are not suitable for processing the highly viscous covering liquids required for coating screens.
  • FIG. 3 shows the structure of such an electrostatic nozzle 2.
  • the covering liquid which is supplied from the pressure containers 21 shown in FIG. 1, is under excess pressure. From there it exits continuously through a bore 30.
  • a thin needle 31 which is excited by ultrasound to produce high-frequency vibration in the longitudinal direction of the needle, provides regular disturbances in the annular flow channel formed by the needle 31 and the bore 30.
  • the oscillatory movement of the needle 31 also prevents the bore 30 from becoming blocked, for example. B. by small particles.
  • a ring electrode 33 is provided, which is kept small in diameter, because sufficient charging of the drops can then be achieved even at low voltages.
  • the aim is to be able to work with a voltage of 100 - 200 V. This voltage must be present at the ring electrode 33 at the moment the drop breaks off. Voltages of this size can still be conveniently switched at high frequencies using transistors.
  • the drop At the time the drop is torn off from the still connected jet, it must be kept at a zero voltage potential with respect to the ring electrode 33, so that a negative charge remains on the tearing drop, and the tear must also take place in the area of the ring electrode 33.
  • the ring electrode 33 is kept small in diameter, whereby high field strengths are achieved even at lower switching voltages.
  • the charged liquid drops which here have the reference numeral 34, are then guided into a catcher 37 by the action of a direct voltage field applied via an electrode 35 on a curved path 36. From there they arrive via the return lines 24 mentioned in FIG. 1 into the vacuum tanks 23 which are also shown there.
  • the uncharged liquid drops 38 are not deflected by this DC voltage field and accordingly continue their path almost linearly along the railway line 39 in order to finally reach the sieve 1 hold true.
  • the screen 1 here has one to the web 39 on this impinging, uncharged drops 38 vertical position. However, it may well be expedient to incline this sieve 1 in relation to such a position, which is shown in connection with the next FIG. 4.
  • the covering liquid must transport solids to a sufficient extent in order to form a well-covering film after drying on the sieve 1, as a result of which a high viscosity is required.
  • the high viscosity helps, however, that after the covering liquid has been applied to the sieve 1, it remains at the impact point despite the centrifugal force acting on it and does not shoot through the perforation of the sieve due to the high impact speed or sprayed into even smaller droplets during the impact on the sieve 1.
  • a combined liquid and air or inert gas supply is carried out in the area of the ring electrode 33.
  • liquid is first introduced through holes 40 in order to clean the ring electrode 33. It is then blown dry through the same bores 40, for example by dry, heated air or an inert gas.
  • the same configuration of the nozzle is additionally used to prevent the thin bore 30 from drying out during longer work breaks.
  • the adjacent air space 41 in front of the bore 30 and inside the ring electrode 33 is filled with flushing liquid through the bores 40.
  • This rinsing liquid is kept under a very slight excess pressure (approximately 10 to 20 mm water column), as a result of which a liquid cell meniscus 43 is formed within the nozzle channel 42, which can persist for a long time and which prevents liquid from escaping from the nozzle channel 42.
  • This filling protects the thin bore 30 from drying out.
  • a conical countersink 44 can be provided in order to allow the liquid as good an access to the bore 30 as possible. Through it the bore 30 opens into the nozzle channel 42 in the direction of the ring electrode 33. However, it may also be expedient not to let the rinsing liquid come into contact with the covering liquid within the bore 30 in order not to dilute the latter.
  • the conical countersink 44 is omitted, and there is only a correspondingly small cylindrical drilling attachment at this point.
  • the flushing liquid will then also form a meniscus in this bore, similar to meniscus 43.
  • the covering fluid at the exit of the bore 30 also forms a meniscus.
  • FIG. 4 shows the overall structure of the nozzle according to FIG. 3.
  • the following apply the same reference numerals as in Figure 3.
  • the direction of impact of the drops 38 on the screen 1 is no longer vertical here, but is at an angle 45. This helps to prevent the drops from passing through the screen 1, because then before each Drop in the direction of its trajectory is always a material wall. In addition, there is a reduced relative speed between the drops and the sieve, which also reduces the risk of the drops bursting.
  • the needle 31 is held in a needle holder 46 which is designed as a step horn, ie the diameter of the needle holder 46 decreases towards the tip of the needle 31.
  • the needle holder 46 is firmly held in a membrane 47 and this is excited by a piezo element 48 to the high-frequency vibration.
  • a pressure piece 49 transmits this vibration to the membrane 47, whereby the liquid in the pressure chamber 29 is also pressurized by the membrane 47 itself.
  • the supply lines to the pressure chamber 29 must be designed to be correspondingly thin. With a corresponding design of the pressure piece 49, a pre-amplification of the vibration amplitude can be achieved mechanically.
  • the piezo element 48 is excited by supply lines (no longer shown) with a high-frequency sine or square wave voltage corresponding to the natural frequency of the nozzle arrangement. Since the piezo element 48 is composed of a large number of thin layers in a sandwich-like manner, even low electrical voltages are sufficient to produce violent contractions or elongations, in particular in the region of the natural frequency of the overall arrangement.
  • the piezo element 48 is statically prestressed in its longitudinal direction by a pressure screw 50, and a counter nut 51 secures this screw setting.
  • a housing 52 statically and dynamically closes the power flow of all individual components.
  • the bore 30 of the nozzle 2 is made in a sapphire plate 53, which is pressed by a screw 54 into a holder 55 and is fixed there in this way.
  • the choice of the sapphire bore material largely reduces the risk of the needle 31, which is made of a metallic material, from rubbing or welding to the bore wall due to the needle vibration.
  • the ring electrode 33 is connected to a supply line 56 in order to transmit an electrical potential to the former to be able to supply the supply line 56.
  • FIG. 5 A further embodiment of an electrostatic nozzle for carrying out the method according to the invention is shown in FIG. 5.
  • the bore 30 is so small in this embodiment, for example in the final diameter 17 microns that it can no longer be penetrated by the needle 31 in its entire length.
  • the needle 31 therefore only extends to the vicinity of the narrowest bore point.
  • the action of the needle 31 is similar to the action that was described earlier.
  • An oscillating movement of the needle 31 in the direction of the nozzle outlet increases the pressure in the nozzle interior 57 both because of the wall thrust forces and because of the displacement effect of the needle end face 32.
  • the corresponding return movement of the needle 31 causes a pressure reduction.
  • the formation of the individual drops takes place in the area of the ring electrode 33, which here too is provided with a suitable supply line for applying an electrostatic potential.
  • the nozzle interior 57, in which the needle 31 moves, is obtained by a nozzle body 58 which is made of hard metal or ceramic. This nozzle body 58 is inserted into a bore 59 of the holder 55, the needle holder 46 can still partially protrude into the bore 59.
  • FIGS. 6, 7 and 8 show the overall structure of the nozzle according to FIG. 5.
  • FIG. 6 shows a section through an elevation of the nozzle
  • FIG. 7 shows a cross-section
  • FIG. 8 shows a cross section through the nozzle.
  • the same elements as in FIGS. 3 to 5 are again provided with the same reference symbols and are not described again.
  • a holder 60 presses a mouthpiece 61, into which the deflection electrode 35 is cast, against the nozzle base body 62.
  • the nozzle channel 42 runs through the mouthpiece 61 and is surrounded on the input side by the ring electrode 33. It is also carried by the mouthpiece 61.
  • the oscillating membrane 47 is located between the housing 52 and the nozzle body 62.
  • the oscillating membrane 47 is clamped between the housing 52 and the nozzle body 62, wherein it is formed by an approximately 0.5 to 1.0 mm thick steel plate, which Because of the special nature of the clamping 31 can only perform bending vibrations in a surrounding area of the needle. In the protruding area, this membrane 47 is used as a clamping element for a microsieve 63.
  • the relatively large thickness of the membrane causes natural frequencies that are between 200 and 300 kHz.
  • the microsieve 63 is clamped between the membrane 47 and the nozzle base body 62 and prevents particles that are larger than 5 ⁇ m and which are inadvertently carried along with the covering liquid from entering the channel system leading to the nozzle.
  • the membrane 47 guided over the microsieve 63 in the inlet area of the liquid and the ultrasound oscillation introduced into it help to avoid a blockage of the microsieve 63 by interlocking pigments.
  • this is held by a system of very small, finely milled support channels 64.
  • the covering liquid is fed through the supply line 22 to the nozzle 2. This supply line 22 is placed tightly on a clamping piece 66 by means of a union nut 65.
  • an air-water supply line 67 Via an air-water supply line 67, the liquid required for the cleaning and drying of the nozzle 2 or the necessary air is fed to the nozzle 2 if necessary.
  • This line 67 is also pressed with a union nut 68 against a screw-in clamping piece 69.
  • the line 67 leads to a changeover valve 70, which is shown symbolically here and is located at a greater distance from the nozzle 2.
  • the electrostatic nozzles described in FIGS. 3 to 8 are particularly suitable for carrying out the method according to the invention, since they can also be used to spray a highly viscous or viscous covering liquid dropwise onto the sieve without the length of the nozzle and thus the dimensions the device for performing the method must assume extremely large values.
  • the cover liquid is resistant to abrasion and chemical influences from the printing chemicals.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Coating Apparatus (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Screen Printers (AREA)
  • Eyeglasses (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Casting Devices For Molds (AREA)

Claims (24)

  1. Procédé de fabrication d'écrans d'impression, dans lequel une couche de recouvrement est déposée sur une trame à mailles fines, caractérisé en ce que la couche de recouvrement (1a) est projetée uniquement sur certaines zones de la trame (1) en utilisant au moins une buse (2), ainsi qu'en respectant un modèle d'impression souhaité.
  2. Procédé selon la revendication 1, caractérisé en ce que la trame (1) est conçue en forme de cylindre et la couche de recouvrement (1a) est projetée pendant la rotation de la trame (1) autour de l'axe du cylindre (1b) et par le déplacement de la buse (2) parallèlement à l'axe du cylindre (1b).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la couche de recouvrement (1a) est projetée sur la trame (1) selon une trajectoire inclinée par rapport à la perpendiculaire de la surface de la trame au point d'impact.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le matériau de la couche de recouvrement (1a) est projeté hors de la buse (2) selon une trajectoire qui est au moins approximativement parallèle à la force de gravité.
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'il est prévu de monter une pluralité de buses (2, 2) pour couvrir une même zone de la surface de la trame.
  6. Procédé selon la revendication 5, caractérisé en ce que les buses (2, 2) peuvent couvrir la zone avec un décalage de temps.
  7. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la couche de recouvrement (1a) est formée par la projection d'un liquide visqueux.
  8. Procédé selon la revendication 7, caractérisé en ce que le liquide visqueux utilisé est une émulsion aqueuse d'un vernis à base de résine synthétique.
  9. Procéde selon la revendication 7, caractérisé en ce que le liquide visqueux utilisé est une suspension aqueuse de pigments.
  10. Procédé selon la revendication 5, caractérisé en ce que la couche de recouvrement (1a) est formée par la projection de différents liquides.
  11. Procédé selon l'une quelconque des revendications 1 à 10, caractérisé en ce que la buse (2) utilisée est une buse électrostatique.
  12. Procédé selon l'une quelconque des revendications 7 à 11, caractérisé en ce que la projection du liquide est effectuée conjointement à un flux de gaz laminaire enveloppant le liquide.
  13. Procédé selon la revendication 12, caractérisé en ce que le flux de gaz utilisé est un flux d'air ou de gaz inerte.
  14. Procédé selon la revendication 12 ou 13, caractérisé en ce que la température du flux de gaz laminaire est supérieure à la température ambiante.
  15. Procédé selon l'une quelconque des revendications 7 à 14, caractérisé en ce que la trame (1) est chauffée et/ou irradiée par des rayons ultraviolets, au moins au point d'impact du liquide.
  16. Dispositif de fabrication d'écrans d'impression avec une station de traitement connue en soi, qui comprend au moins un dispositif de positionnement (5, 6) pour positionner une trame cylindrique creuse (1) sur la partie frontale, un dispositif d'entraînement (9, 10, 11) pour la rotation de la trame (1) autour de l'axe du cylindre (1b), un plateau de traitement (14) mobile parallèlement à l'axe du cylindre (1b) et une unité de commande (4) pour commander le dispositif d'entraînement (9, 10, 11), le déplacement du plateau de traitement (14), ainsi que pour commander un poste d'outillage monté sur le plateau de traitement (14), caractérisé en ce que le poste d'outillage comprend au moins une buse (2) destinée à la projection du liquide, qui est conçue de telle sorte que le liquide soit projeté sur la trame (1) selon une trajectoire inclinée par rapport à la verticale de la surface de la trame au point d'impact.
  17. Dispositif selon la revendication 16, caractérisé en ce que le poste d'outillage comprend une pluralité de buses (2, 2) montées l'une à côté de l'autre dans le sens longitudinal de la trame cylindrique creuse (1).
  18. Dispositif selon la revendication 16 ou 17, caractérisé en ce que chaque buse (2) est reliée à un récipient de surpression (21) pour le liquide à projeter et à un récipient de dépression (23), dans lequel est renvoyé le liquide non utilisé, projeté par la buse (2).
  19. Dispositif selon l'une quelconque des revendications 16 à 18, caractérisé en ce que l'axe longitudinal des buses (39) est orienté sensiblement selon une direction verticale.
  20. Dispositif selon l'une quelconque des revendications 16 à 19, caractérisé en ce que la buse (2) reçoit des signaux électriques de projection (S1, S2) émis par l'unité de commande (4), lesquels concordent avec un modèle déterminé et dépendent de la position de rotation de la trame cylindrique (1) et de la position du plateau de traitement (14).
  21. Dispositif selon les revendications 17 et 20, caractérisé en ce que les buses (2, 2) aspergent différentes zones de la trame cylindrique (1) et l'unité de commande (4) émet les signaux électriques de projection (S1, S2) avec un décalage de temps à chaque buse (2) placée derrière la précédente dans le sens de déplacement du plateau de traitement (14).
  22. Dispositif selon les revendications 17 et 20, caractérisé en ce que toutes les buses (2, 2) aspergent une même zone de la trame cylindrique (1) et l'unité de commande (4) émet les signaux électriques de projection (S1, S2) en même temps à toutes les buses.
  23. Dispositif selon l'une quelconque des revendications 16 à 22, caractérisé en ce qu'un système de chauffage (H) et/ou un système de radiation thermique pour le chauffage et/ou une source de rayons ultraviolets pour l'irradiation du liquide projeté sur la trame cylindrique (1) sont montés derrière chaque point d'impact du liquide, considéré dans le sens de rotation de la trame cylindrique (1).
  24. Dispositif selon la revendication 23, caractérisé en ce que le système de chauffage (H) et/ou la source de rayons ultraviolets sont montés sur le plateau de traitement (14).
EP92116181A 1992-09-22 1992-09-22 Procédé et dispositif pour fabriquer des matrices d'impression par stencil Expired - Lifetime EP0590164B1 (fr)

Priority Applications (8)

Application Number Priority Date Filing Date Title
AT95119508T ATE188167T1 (de) 1992-09-22 1992-09-22 Vorrichtung zur herstellung von druckschablonen
ES92116181T ES2095994T3 (es) 1992-09-22 1992-09-22 Procedimiento y dispositivo para fabricar plantillas de impresion por estarcido.
DE59207684T DE59207684D1 (de) 1992-09-22 1992-09-22 Verfahren und Vorrichtung zur Herstellung von Druckschablonen
AT92116181T ATE146127T1 (de) 1992-09-22 1992-09-22 Verfahren und vorrichtung zur herstellung von druckschablonen
ES95119508T ES2141881T3 (es) 1992-09-22 1992-09-22 Dispositivo para la fabricacion de plantillas de impresion.
DE59209787T DE59209787D1 (de) 1992-09-22 1992-09-22 Vorrichtung zur Herstellung von Druckschablonen
EP95119508A EP0714766B1 (fr) 1992-09-22 1992-09-22 Procédé pour fabriquer des matrices d'impression par stencil
EP92116181A EP0590164B1 (fr) 1992-09-22 1992-09-22 Procédé et dispositif pour fabriquer des matrices d'impression par stencil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP92116181A EP0590164B1 (fr) 1992-09-22 1992-09-22 Procédé et dispositif pour fabriquer des matrices d'impression par stencil

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP95119508.0 Division-Into 1992-09-22

Publications (2)

Publication Number Publication Date
EP0590164A1 EP0590164A1 (fr) 1994-04-06
EP0590164B1 true EP0590164B1 (fr) 1996-12-11

Family

ID=8210033

Family Applications (2)

Application Number Title Priority Date Filing Date
EP92116181A Expired - Lifetime EP0590164B1 (fr) 1992-09-22 1992-09-22 Procédé et dispositif pour fabriquer des matrices d'impression par stencil
EP95119508A Expired - Lifetime EP0714766B1 (fr) 1992-09-22 1992-09-22 Procédé pour fabriquer des matrices d'impression par stencil

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP95119508A Expired - Lifetime EP0714766B1 (fr) 1992-09-22 1992-09-22 Procédé pour fabriquer des matrices d'impression par stencil

Country Status (4)

Country Link
EP (2) EP0590164B1 (fr)
AT (2) ATE146127T1 (fr)
DE (2) DE59207684D1 (fr)
ES (2) ES2095994T3 (fr)

Cited By (6)

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US8011300B2 (en) 2006-02-21 2011-09-06 Moore Wallace North America, Inc. Method for high speed variable printing
US8136936B2 (en) 2007-08-20 2012-03-20 Moore Wallace North America, Inc. Apparatus and methods for controlling application of a substance to a substrate
US8733248B2 (en) 2006-02-21 2014-05-27 R.R. Donnelley & Sons Company Method and apparatus for transferring a principal substance and printing system
US8869698B2 (en) 2007-02-21 2014-10-28 R.R. Donnelley & Sons Company Method and apparatus for transferring a principal substance
US8967044B2 (en) 2006-02-21 2015-03-03 R.R. Donnelley & Sons, Inc. Apparatus for applying gating agents to a substrate and image generation kit
US9463643B2 (en) 2006-02-21 2016-10-11 R.R. Donnelley & Sons Company Apparatus and methods for controlling application of a substance to a substrate

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US6076459A (en) * 1995-01-26 2000-06-20 Fingraf Ag Method and apparatus for the production of a printing stencil
EP0792059A1 (fr) * 1996-02-21 1997-08-27 Schablonentechnik Kufstein Aktiengesellschaft Procédé et appareil pour la fabrication d'une matrice d'impression par stencil
US5819653A (en) * 1996-10-22 1998-10-13 Mccue; Geoffrey A. Method for making a screen printing screen
ATE192077T1 (de) * 1997-08-18 2000-05-15 Schablonentechnik Kufstein Ag Verfahren zur herstellung einer siebdruckschablone und hierfür geeignete vorrichtung
US20060098235A1 (en) * 2002-10-30 2006-05-11 National Research Council Of Canada Method of producing an image on a printing screen
US9701120B2 (en) 2007-08-20 2017-07-11 R.R. Donnelley & Sons Company Compositions compatible with jet printing and methods therefor
DE102011118772A1 (de) * 2011-11-17 2013-05-23 Dertlioglu Adnan Vorrichtung zum Bearbeiten von rohrförmigen Werkstücken

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Cited By (19)

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Publication number Priority date Publication date Assignee Title
US8833257B2 (en) 2006-02-21 2014-09-16 R.R. Donnelley & Sons Company Systems and methods for high speed variable printing
US8733248B2 (en) 2006-02-21 2014-05-27 R.R. Donnelley & Sons Company Method and apparatus for transferring a principal substance and printing system
US8011300B2 (en) 2006-02-21 2011-09-06 Moore Wallace North America, Inc. Method for high speed variable printing
US8967044B2 (en) 2006-02-21 2015-03-03 R.R. Donnelley & Sons, Inc. Apparatus for applying gating agents to a substrate and image generation kit
US8402891B2 (en) 2006-02-21 2013-03-26 Moore Wallace North America, Inc. Methods for printing a print medium, on a web, or a printed sheet output
US8061270B2 (en) 2006-02-21 2011-11-22 Moore Wallace North America, Inc. Methods for high speed printing
US9463643B2 (en) 2006-02-21 2016-10-11 R.R. Donnelley & Sons Company Apparatus and methods for controlling application of a substance to a substrate
US8899151B2 (en) 2006-02-21 2014-12-02 R.R. Donnelley & Sons Company Methods of producing and distributing printed product
US9114654B2 (en) 2006-02-21 2015-08-25 R.R. Donnelley & Sons Company Systems and methods for high speed variable printing
US9505253B2 (en) 2006-02-21 2016-11-29 R.R. Donnelley & Sons Company Method and apparatus for transferring a principal substance and printing system
US8887634B2 (en) 2006-02-21 2014-11-18 R.R. Donnelley & Sons Company Methods for printing a printed output of a press and variable printing
US8881651B2 (en) 2006-02-21 2014-11-11 R.R. Donnelley & Sons Company Printing system, production system and method, and production apparatus
US8887633B2 (en) 2006-02-21 2014-11-18 R.R. Donnelley & Sons Company Method of producing a printed sheet output or a printed web of a printing press
US8869698B2 (en) 2007-02-21 2014-10-28 R.R. Donnelley & Sons Company Method and apparatus for transferring a principal substance
US8434860B2 (en) 2007-08-20 2013-05-07 Moore Wallace North America, Inc. Method for jet printing using nanoparticle-based compositions
US8894198B2 (en) 2007-08-20 2014-11-25 R.R. Donnelley & Sons Company Compositions compatible with jet printing and methods therefor
US8136936B2 (en) 2007-08-20 2012-03-20 Moore Wallace North America, Inc. Apparatus and methods for controlling application of a substance to a substrate
US8496326B2 (en) 2007-08-20 2013-07-30 Moore Wallace North America, Inc. Apparatus and methods for controlling application of a substance to a substrate
US8328349B2 (en) 2007-08-20 2012-12-11 Moore Wallace North America, Inc. Compositions compatible with jet printing and methods therefor

Also Published As

Publication number Publication date
DE59209787D1 (de) 2000-02-03
EP0714766B1 (fr) 1999-12-29
ES2141881T3 (es) 2000-04-01
EP0714766A3 (fr) 1996-08-07
EP0714766A2 (fr) 1996-06-05
DE59207684D1 (de) 1997-01-23
EP0590164A1 (fr) 1994-04-06
ATE146127T1 (de) 1996-12-15
ES2095994T3 (es) 1997-03-01
ATE188167T1 (de) 2000-01-15

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