EP2070698A2 - Dispositif et procédé pour mesurer la tension du tissu dans un cadre de sérigraphie - Google Patents

Dispositif et procédé pour mesurer la tension du tissu dans un cadre de sérigraphie Download PDF

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Publication number
EP2070698A2
EP2070698A2 EP08021510A EP08021510A EP2070698A2 EP 2070698 A2 EP2070698 A2 EP 2070698A2 EP 08021510 A EP08021510 A EP 08021510A EP 08021510 A EP08021510 A EP 08021510A EP 2070698 A2 EP2070698 A2 EP 2070698A2
Authority
EP
European Patent Office
Prior art keywords
screen
printing
forces
force
segments
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Withdrawn
Application number
EP08021510A
Other languages
German (de)
English (en)
Other versions
EP2070698A3 (fr
Inventor
Josef Kleinschnitz
Peter Schmitt
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.)
KBA Metronic GmbH
Original Assignee
KBA Metronic 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 KBA Metronic GmbH filed Critical KBA Metronic GmbH
Publication of EP2070698A2 publication Critical patent/EP2070698A2/fr
Publication of EP2070698A3 publication Critical patent/EP2070698A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/34—Screens, Frames; Holders therefor
    • B41F15/36—Screens, Frames; Holders therefor flat

Definitions

  • the invention relates to a device, in particular for a screen printing machine, for measuring the wire tension of the screen fabric in a screen frame.
  • the invention further relates to a method, in particular for a screen printing machine, for measuring the wire tension of the screen fabric in a screen frame.
  • Printing machines which operate on the principle of screen printing and in particular screen printing machines, which operate by means of a flat screen; have long been known and are used industrially for printing a wide variety of products.
  • optical data carriers such as CDs or DVDs are screen-printed, but also garments, bottles, cans, or in particular in electronics production soldering pastes or etch-resistant masks are applied to board material by means of screen printing equipment.
  • this flat-screen printing machines are used, which always work on the same basic principle, by means of a clamped in a frame flat screen, in particular screen fabric through which the ink is painted on the surface to be printed.
  • the information to be transmitted or the printed image is present in such a way that those areas that do not contribute to the printed image, for example, covered by a paint, whereas those areas over which the Printed image is to be transferred to the surface to be printed, is not covered, so that at these points a printing ink between the meshes of the screen can be pushed through.
  • the printing takes place in that the screen is positioned with its underside at a small distance from the surface to be printed and a printing ink, which is located on the top of the screen is painted over the surface of the screen by means of a working doctor blade with a certain contact pressure, so that the screen fabric along the doctor edge is pressed onto the surface to be printed.
  • an ink located on the upper side of the printing screen is pressed along the doctor edge at the open points of the screen through the meshes of the screen and is transferred to the underside of the screen on the surface to be printed.
  • the contact pressure of the working doctor blade is chosen so that the underside of the screen always comes into contact with the surface to be printed only at a point which substantially corresponds to the shape of the front edge of the working doctor blade.
  • the ink is cyclically evenly distributed on the screen surface, so that in a clocked operation each other subsequent surfaces to be printed in the same quality can be printed. Due to the repeated use of the squeegee by the squeegee and possibly existing edges on the object to be printed, however, it may happen that the wire breaks at one or more points, so that either the printing at these points becomes faulty and / or uncontrolled Print down on the products or in the underlying machine elements.
  • Deterioration of print quality can also occur if the mechanical tension with which the screen fabric is stretched on the screen frame decreases, for example due to prolonged use or overstretching of the fabric.
  • the resulting poorer print quality is often recognized too late, so that afterwards a number of products must be sorted out whose printing does not meet the requirements.
  • a disadvantage of the type described is that at a relaxation of the wire tension despite a readjustment of the contact pressure of the working doctor blade there is a danger that increases the contact zone between Siebunterseite and substrate surface or in particular at an uneven change in the wire tension, the contact zone inhomogeneously changed, creating a uneven printing results.
  • the average current mechanical wire tension reliably with a certain Accuracy to measure, whereby a decrease in the mean wire tension are detected in good time and thus the mean wire tension can be readjusted accordingly, either by the operator or by means of a controlled device.
  • the object of the invention is therefore to provide a method and an apparatus with which the mentioned disadvantages of existing devices and systems are eliminated and beyond a higher reliability of a screen printing machine is ensured.
  • the object of the invention is furthermore to provide a method and a device, whereby it is possible to continuously measure the mechanical tension of a printing screen, in particular during operation in a printing machine and spatially resolved, and optionally readjust automatically.
  • the object of the invention is also to provide an apparatus and a method, whereby it is possible to detect a sieve break or the beginning of a sieve unambiguous and timely during the normal production process.
  • the device according to the invention has a receiving device for receiving the screen frame, the receiving strips are each divided into several segments and each segment is associated with at least one sensor device for Switzerlandwoodsress.
  • the object is achieved in that a sieve frame provided with a screen fabric is mounted in a receiving device / whose receiving strips are each subdivided into several segments and with sensor devices, of which at least one is assigned to a segment between a segment and the Screen frame acting force is detected.
  • the mechanical tension of the mesh fabric can be measured by means of a number of force sensors, being acted upon by the respective sides of the screen frame to respective corresponding force sensors.
  • a printing unit on such a recording device which may be formed as a holding frame, which does not necessarily have to be circumferentially closed and in which an example rectangular, covered with a mesh screen frame is inserted and fixed there by means of appropriate fasteners.
  • the receiving device or the holding frame can be designed so that it / he has corresponding receiving strips for the screen frame, which are divided along their extension into individual segments. These receiving strips are arranged substantially parallel to the respective frame members of a screen frame. Of the segments may preferably be two opposite each other. Furthermore, according to the invention, at least one force sensor is associated with each segment, in particular within each segment at least one force sensor is provided and mounted in such a way that the tensile force acting in this segment through the clamped screen frame via the receiving strip can be measured.
  • each of the mentioned segments may be equip with an individually controllable traction device, whereby on the one hand a mechanical pretension is applied to the sieve can be, which acts in addition to the specified during the manufacture of the screen mechanical tension and on the other hand, a possibly imprinted imbalance of zonewise detectable mechanical stresses in the sieve can be compensated.
  • the frame of the screen may be expedient to make the frame of the screen mechanically less stable compared to conventional screen frame, so as to exercise a force on the receiving strip of the holding frame easier. It may also be expedient not to connect the frame elements of the screen frame in the respective corners firmly but, for example, pluggable or flexible, so that in a carried out by means of the holding frame retightening of the mesh a more homogeneous distribution of mechanical stresses in the individual zones is possible ,
  • the active area of the screen is defined as the area in which the image to be printed is introduced into the screen fabric.
  • This first tensile force can be chosen such that when the wire tension decreases, it can always be reliably measured via the mentioned force sensors.
  • the tensile forces of the traction devices can be set so that the tensile forces measured by the opposing force sensors are equal and / or at least electronically compensated by their measured values being subtracted from one another in an evaluation circuit, for example.
  • the ratios of the measured forces are disturbed, at least in the associated complementary pairs of sensors, which is recognized, for example, above a certain amount of interference by a corresponding control as an error condition, which, for example a stop of the printing press can be triggered with a corresponding warning message.
  • the measured differences in force can be so great that they can already be clearly identified via the force sensors without additional force exerted by the doctor blades, or at least when crossing the affected area with one of the doctor blades, the force difference is detected via the corresponding complementary sensor pairs can.
  • This is particularly relatively easy and reliable to recognize, because due to the multiple force sensors on each side additional comparison of the measured forces of adjacent pairs of sensors can be done to reliably exclude other external influences.
  • Such intermediate storage can take place, for example, in a corresponding control according to the FIFO principle (First In First Out).
  • FIG. 1 The representation of an imaged screen frame, as it is commonly used in industrial screen printing is schematically in FIG. 1 shown.
  • a screen printing frame 1 which is for example rectangular and the 4 side frame members 1a, 1b, 1c, 1d comprises, a coated screen fabric 2 is stretched so that it has a certain predetermined during manufacture basic tension.
  • the screen fabric 2 is glued to the frame, on the one hand to ensure a good binding of the screen fabric 2 to the screen printing frame 1 and on the other hand produce a color-tight connection between the screen printing frame 1 and the screen fabric 2.
  • An attachment can also be made in other ways, e.g. also by pinching the screen mesh between an upper and a lower frame part.
  • the coating 2a of the screen fabric 2 is removed for printing at the points 2b, so that an ink between the mesh of the screen fabric 2 can be pressed by means of a doctor blade 30 in a screen printing unit and the ink can be transferred to a substrate.
  • the screen cloth 2 is repeatedly loaded and stretched by the action of the doctor blade 30 in the direction of the arrow 100, so that the original screen tension decreases over time.
  • FIG. 2 shows a first embodiment according to the invention for measuring the wire tension.
  • the screen frame 1 covered with an illustrated screen cloth 2 is clamped in a holding frame 3 which forms the receiving device and its respective receiving strips 3a, 3b, 3c, 3d assigned to the frame elements of the screen frame into individual segments 3a.1, 3a.2, 3a. 3, ... or 3b.1, 3b.2, 3b.3, ... or 3c.1, 3c.2, 3c.3, ... or 3d.1, 3d.2, 3d.3, ... are divided.
  • the holding frame shown here does not form a closed holding frame, since no segments are provided directly in the corner regions. However, this may also be provided in an alternative embodiment, in particular wherein then also a diagonal tensile force or force measurement in diagonal direction may be possible.
  • the arrangement of the respective segments relative to each other is such that on the one hand the opposing receiving strips 3a and 3c and 3b and 3d each have the same number of segments and on the other the size of all segments is equal and continue two segments of opposite receiving strips each other lie opposite and thus each form a corresponding pair of segments.
  • the segments 3a form. 1 and 3c. 1 and the segments 3a.2 and 3c.2, etc. each one pair.
  • each of the segments 3a.1, 3a.2, ..., 3b.1, 3b.2, ..., 3c.1, 3c.2, ..., 3d, 1, 3d.2, ... at least one force sensor 6 is associated, which is integrated in a possible embodiment, for example, in the respective segment and detected by which each acting on the associated segment portion of a force exerted on the mesh 2 force and to a not shown Parent control is forwarded and processed there by means of a control program.
  • a force 100 which, as in FIG. 1 is shown perpendicular to the screen surface 2 is applied, is thus of the different sensor elements 6 via the Sieve frame 1 and the respective segments 3a.1, 3a.2, ..., 3b.1, 3b.2, ..., 3c.1, 3c.2, ..., 3d.1, 3d.2, .., detected with different strength, depending on where it acts on the mesh 2.
  • a force acting horizontally on the screen cloth 2 at the point A is detected by the sensors 6 of the segments 3a.2 and 3c.2 of this sensor pair with the same strength, whereas the sensors 6 of the segments 3b.2 and 3d. 2 each measure different forces.
  • the position and the mean strength of the force action can be calculated continuously from the determined force components of each individual sensor 6 and their relationships to one another in the higher-order control. The same applies to the action of force by means of a squeegee acting essentially linearly on the screen cloth 2.
  • a force pattern which is greatly changed at least in the area of the sieve crack, is directly transmitted via the sensors 6 detected by the controller, whereby, for example, a machine stop can be triggered to counteract contamination or incorrect printing.
  • each of the segments 3a.1, 3a.2, ..., 3b.1, 3b.2 3c .1, 3c.2,... 3d.1, 3d.2,... To be provided with a respective pulling device and / or printing device 40, which acts on the respective segment via a respective connection 4, for example.
  • a pulling device for example, electric motors, pneumatic cylinders, linear motors or the like can be used.
  • a pulling device for example, electric motors, pneumatic cylinders, linear motors or the like can be used.
  • the traction devices 40 By an appropriate control of the traction devices 40, it is possible, for example, in addition to the initial already impressed on the printing screen 2 in the production screen tension to superimpose a further tensile stress, whereby it is on the one hand possible to set a respective favorable operating point of the sensors 6 and others, for example an initially determined inhomogeneity of the embossed in the printing screen 2 screen tension largely compensate, for example by the traction devices 40 of the respective segments 3a. 1, 3a.2, ... 3b.1, 3b.2, ..., 3c.1, 3c.2, ..., 3d.1, 3d.2, ... are controlled accordingly.
  • FIG. 3 shows a further embodiment of a device according to the invention for detecting the wire tension, in which case the sensors 6 are arranged in / on the respective segments that they are directly in contact with the screen fabric 2, for example, at a certain distance to the screen frame 1.
  • the sensors 6 are arranged in / on the respective segments that they are directly in contact with the screen fabric 2, for example, at a certain distance to the screen frame 1.
  • each sensor 6 experiences each segment a certain force whose strength depends essentially on the distance of the sensor 6 to the force.
  • Such sensors 6 can be embodied, for example, as a sensor cable and operate, for example, on the basis of piezoelectricity, the dielectric located in a coaxial cable having piezoelectric properties in addition to its insulating properties.
  • a force acting on the plastic sheath of the cable thereby also deforms the piezoelectric dielectric in the interior of the coaxial cable, whereby a voltage pulse is generated at the ends of the cable.
  • other sensors may be used, which for example, work as part of a resonant circuit and in which a force on the sensor causes a frequency shift, which can be evaluated accordingly.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
EP08021510A 2007-12-14 2008-12-11 Dispositif et procédé pour mesurer la tension du tissu dans un cadre de sérigraphie Withdrawn EP2070698A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007060916A DE102007060916B3 (de) 2007-12-14 2007-12-14 Vorrichtung und Verfahren zur Messung der Siebspannung des Siebgewebes in einem Siebrahmen

Publications (2)

Publication Number Publication Date
EP2070698A2 true EP2070698A2 (fr) 2009-06-17
EP2070698A3 EP2070698A3 (fr) 2010-12-01

Family

ID=40445511

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08021510A Withdrawn EP2070698A3 (fr) 2007-12-14 2008-12-11 Dispositif et procédé pour mesurer la tension du tissu dans un cadre de sérigraphie

Country Status (4)

Country Link
US (1) US7836778B2 (fr)
EP (1) EP2070698A3 (fr)
CN (1) CN101497255A (fr)
DE (1) DE102007060916B3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102305684A (zh) * 2011-05-24 2012-01-04 冯锦雄 一种电子式网版张力计

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CN102455234B (zh) * 2010-11-01 2014-04-30 香港纺织及成衣研发中心 薄膜型风压传感器及相应的无线传感网络
TW201223776A (en) * 2010-12-09 2012-06-16 Metal Ind Res & Dev Ct Printing apparatus with halftone strain detection and the halftone thereof
CN102169039A (zh) * 2011-04-26 2011-08-31 广东省计量科学研究院 印刷用筛网(丝网)张力计校准装置
KR102063832B1 (ko) * 2012-12-17 2020-01-09 삼성디스플레이 주식회사 스크린 마스크
DE102014112161A1 (de) * 2014-08-26 2016-03-03 Karlsruher Institut für Technologie Biaxiale Messvorrichtung und Verfahren zur Bestimmung von normal- und schubspannungskorrelierten Werkstoffparametern
CN104608475A (zh) * 2015-01-15 2015-05-13 长兴艾飞特塑料科技有限公司 一种丝网印刷用网版
CN104655444B (zh) * 2015-03-19 2017-03-15 常州工学院 一种门窗纱网的质量检测装置及其使用方法
CN107618256B (zh) * 2017-10-27 2019-07-30 京东方科技集团股份有限公司 掩膜组件及丝网印刷设备
CN107672294B (zh) * 2017-11-10 2020-06-23 京东方科技集团股份有限公司 丝网印刷装置以及用于调整其印刷丝网的张力的方法
EP3725521B1 (fr) * 2017-12-15 2022-03-30 Fuji Corporation Machine de sérigraphie
CN108501506B (zh) * 2018-03-15 2020-03-06 合肥京东方显示光源有限公司 一种网版和丝网印刷机
JP7170262B2 (ja) * 2018-09-19 2022-11-14 パナソニックＩｐマネジメント株式会社 品質管理システム及び品質管理方法
CN109406255B (zh) * 2018-10-11 2020-06-16 中国矿业大学 一种涂层织物膜材顶破试验的夹具及顶破装置
CN117949310A (zh) * 2024-01-17 2024-04-30 兰州理工大学 一种过滤器骨架形变量测量装置

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Publication number Priority date Publication date Assignee Title
CN102305684A (zh) * 2011-05-24 2012-01-04 冯锦雄 一种电子式网版张力计

Also Published As

Publication number Publication date
CN101497255A (zh) 2009-08-05
EP2070698A3 (fr) 2010-12-01
US7836778B2 (en) 2010-11-23
US20090151468A1 (en) 2009-06-18
DE102007060916B3 (de) 2009-06-25

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