WO2001091919A1 - Systeme racloir destine a appliquer une matiere imprimable sur une surface - Google Patents

Systeme racloir destine a appliquer une matiere imprimable sur une surface Download PDF

Info

Publication number
WO2001091919A1
WO2001091919A1 PCT/DE2001/002004 DE0102004W WO0191919A1 WO 2001091919 A1 WO2001091919 A1 WO 2001091919A1 DE 0102004 W DE0102004 W DE 0102004W WO 0191919 A1 WO0191919 A1 WO 0191919A1
Authority
WO
WIPO (PCT)
Prior art keywords
doctor
doctor blade
blade
squeegee
printable material
Prior art date
Application number
PCT/DE2001/002004
Other languages
German (de)
English (en)
Inventor
Ulf Oestermann
Erik Jung
Paradiso Coskina
Original Assignee
Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
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 claimed from DE10120117A external-priority patent/DE10120117A1/de
Application filed by Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. filed Critical Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
Publication of WO2001091919A1 publication Critical patent/WO2001091919A1/fr

Links

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
    • H05K3/12—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 thick film techniques, e.g. printing techniques to apply the conductive material or similar techniques for applying conductive paste or ink patterns
    • H05K3/1216—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 thick film techniques, e.g. printing techniques to apply the conductive material or similar techniques for applying conductive paste or ink patterns by screen printing or stencil printing
    • H05K3/1233—Methods or means for supplying the conductive material and for forcing it through the screen or stencil
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades
    • B05C11/045—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades characterised by the blades themselves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/44—Squeegees or doctors
    • 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
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/01—Tools for processing; Objects used during processing
    • H05K2203/0104—Tools for processing; Objects used during processing for patterning or coating
    • H05K2203/0139—Blade or squeegee, e.g. for screen printing or filling of holes
    • 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
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/02—Details related to mechanical or acoustic processing, e.g. drilling, punching, cutting, using ultrasound
    • H05K2203/0278—Flat pressure, e.g. for connecting terminals with anisotropic conductive adhesive

Definitions

  • Squeegee system for applying a printable material to a surface
  • the present invention relates to a doctor system with a doctor holder and a doctor blade attached to the doctor holder for applying a printable material, in particular a paste, to a surface.
  • doctor blade system One area of application of such a doctor blade system relates to the production of electrical contacts between electronic components and the respective carrier materials. Numerous contacting methods are known for this.
  • solder paste In the method most frequently encountered today, contact is made by applying solder paste using a stencil printing technique directly onto the surfaces of the carrier material to be contacted, for example a printed circuit board. Subsequent heat processing solidifies the solder paste that has been structured in this way.
  • the stencil printing technology can also be used to create solder deposits on semiconductor wafers. The two fields of application mentioned by way of example differ from one another in the process only in the materials used and the required process parameters. State of the art
  • solder pastes When applying solder pastes, a general distinction can be made between sequential and simultaneous processes.
  • the most frequently used method for printing on printed circuit boards or wafers is the stencil printing technique already mentioned, in which the contact areas are printed simultaneously.
  • the solder paste is transferred through openings in the stencil to the surface to be printed during the printing process.
  • an essential parameter for a good quality printing process is also the constructive design of the squeegee used.
  • the solder paste is introduced into the stencil openings by rolling the paste in front of the squeegee.
  • the paste penetrates into these openings.
  • the excess paste is removed from the surface of the stencil by the doctor blade.
  • the doctor blade is attached to a doctor holder, which in turn - in automated printing techniques - is held in a doctor holder on the doctor head of the printing machine.
  • the printing machine carries out the squeegee movement over the surface to be printed.
  • the solder paste is not introduced in closed doctor blade systems by rolling the paste in front of a doctor blade, but by pressing the solder paste directly into the stencil openings under pressure.
  • the closed doctor blade system consists of a chamber that is open to the surface and that is completely filled with solder paste during the printing process. A pressure is applied to the solder paste in the chamber, by means of which it is pressed into the stencil openings.
  • the lower edge of the walls of the chamber which can also be in the form of doctor blades, lie here on the surface of the stencil with their lower edge in order to be able to seal the chamber from the outside. It also frees the stencil surface from excess print material.
  • Stencil printing of solder paste is also increasingly being used to create contacts on wafers. Due to the ever progressive reduction in the size of the structures to be printed, the conventional doctor blades reach the limits of their performance due to the system. In the context of increasing miniaturization, this is also the case with solder transfer Printed circuit boards, the so-called fine pitch printing, the case.
  • the problems usually lie in an uneven filling of the stencil openings, especially if the contact center distance is in a range below 300 ⁇ m.
  • the contact center distance is in a range below 300 ⁇ m.
  • closed doctor systems in such application fields leads to higher quality results, but closed doctor systems are far more demanding in their use and operation. They require a number of installations and in some cases even a retrofit of the existing machine park. Their handling is also a lot more complex than that of the open doctor blade systems. Furthermore, a relatively large amount of solder paste has to be used to fill the pressure chambers of these systems, which can have a negative effect, particularly with regard to the number of pieces to be printed, and requires an increased financial outlay. The time required to prepare and rework closed systems is an additional cost factor that makes them seem unattractive to most end users.
  • the object of the present invention is to provide a doctor blade system for applying printable material to a surface, which is is easy to handle and produces high-quality print quality even for the printing tasks at wafer level.
  • the present squeegee system with a squeegee holder and at least one squeegee blade attached to the squeegee holder for applying a printable material, in particular a paste, to a surface is characterized in that at least one additional squeegee element is arranged in the squeegee direction in front of the squeegee blade and is connected to the doctor blade in such a way that it forms an upwardly closed chamber - or groove open to the surface - with the doctor blade and, when the doctor system is used as intended, has a lower boundary with a slightly greater distance from the surface than the lower edge of the doctor blade, so that, on the one hand, printable material is rolled or pushed in front of the doctor element and, on the other hand, part of the printable material can penetrate into the chamber under the doctor element.
  • the present invention provides a squeegee system that can be handled like an open squeegee system, but additional advantageous ones
  • the arrangement of the doctor element in the specified embodiment in front of the doctor blade will Rolls of the printable material - hereinafter referred to as solder paste by way of example - in front of the bow of this doctor element. Since the lower limit of the squeegee element is at a defined distance from the surface of the stencil - while the squeegee blade lies on the stencil during the printing process - the chamber behind it is also referred to below as the pressure chamber due to its function during the traversing movement of the squeegee system filled with solder paste.
  • This configuration provides a larger area for filling the stencil openings compared to an open doctor blade system and, on the other hand, exerts a higher pressure on the solder paste located in the chamber than is the case with conventional rolling in front of a doctor blade.
  • the volume of solder paste provided in the pressure chamber is only slightly larger than the volume of solder paste that must be used in conventional open doctor blade systems.
  • the resulting printed image is characterized by a homogeneous filling of the stencil openings.
  • the achievable wet layer thickness is in Area of the known systems, but combines the advantages of an open and closed system in terms of robustness, manageability, print quality to be achieved and the costs involved.
  • different stencil opening geometries can be filled uniformly and homogeneously at the same time.
  • the doctor system in particular its doctor holder and / or doctor blade and / or doctor element, can be formed from different, preferably easily structured, materials. Examples of such materials are metals, plastics, composite materials or ceramics.
  • the doctor blade system is suitable for the structured application of a printable material, such as solder pastes, adhesives, polymers or materials for thick-film technology, to printed materials such as semiconductors, wafers, ceramics, organic substrates, inorganic substrates, rigid or flexible
  • the squeegee system can not only be used for stencil printing technology, but also for other printing techniques, for example screen printing technology.
  • any suitable material can be used with the doctor system
  • the doctor system itself is usually mounted with the doctor holder in a doctor holder of a printing machine.
  • the doctor blade holder only has to be adapted to the shape of the doctor blade holder.
  • conventional doctor holders such as those of open doctor systems are known, both the open and the present doctor system can be used without changes to the same printing press.
  • the doctor blade and the at least one doctor element can be fastened to the doctor holder in a conventional manner, for example by screwing on.
  • the squeegee holder can also fix the squeegee blade and the one or more squeegee elements via a clamping mechanism.
  • the individual components, doctor blade and doctor element can be formed in one piece with one another or can be present as separate components, which are either directly connected to one another or held together by the doctor holder.
  • doctor blade and the doctor element or elements preferably consist of one or more structured blocks of material, in particular of plastic.
  • doctor elements are provided in front of the doctor blade. These doctor elements are connected in series, have a defined distance from the surface of the stencil during the printing process and each form individual, upwardly closed chambers between the individual doctor elements. In this way, several pressure chambers lying one behind the other as well as an even larger area for the paste entry are provided. The known rolling of the paste takes place in front of the foremost doctor element.
  • the present doctor system is preferably used for applying a paste to a surface. The distance between the lower boundary of the doctor element and the surface of the stencil or screen is set so that it corresponds to at least four times the diameter of the average particle size of the paste.
  • a distance of the lower limit of the doctor element to the surface of the stencil is selected, which is in the range between 1 mm and 5 mm.
  • the volume of the chamber formed between the doctor element and doctor blade preferably takes up a maximum of 20 ml of the printable material per cm of doctor blade width.
  • Fig. 1 shows an example of the solder paste when stencil printing with the help of an open
  • FIG. 2 shows a schematic phase representation of the functioning of the present doctor system
  • 3 shows an exemplary embodiment of a doctor blade system (without doctor blade holder) according to the present invention
  • 4 shows another example of a doctor blade system according to the present invention
  • FIG. 5 shows the doctor system of FIG. 3 in an exploded view
  • 6 shows a comparison of a known open doctor blade system with an embodiment of the doctor blade system of the present invention
  • FIG. 1 shows, by way of example, the solder paste entry in the stencil printing technique using a doctor blade, as is known from the prior art.
  • a template 10 with correspondingly structured openings 11 is placed on the surface of the wafer 12.
  • the template openings 11 are provided at locations where, for example, a bond pad 14 is to be produced on the wafer.
  • the solder paste 6 is drawn over the stencil with a squeegee 13.
  • the openings 11 of the template 10 fill with the solder paste 6.
  • a tempering step is then carried out to solidify the applied solder paste.
  • a tempering step is then carried out to solidify the applied solder paste.
  • the present doctor system avoids this
  • Figure 2 shows schematically an example of a
  • the present doctor system is composed in the usual way of a doctor holder 3 with a doctor blade 1.
  • Doctor blade 1 a doctor element 2 arranged and connected to the doctor blade 1.
  • the connection can be made by direct attachment to the doctor blade 1 or via the doctor holder 3.
  • the doctor element 2 is designed and arranged opposite the doctor blade 1 and inserted in a doctor holder in such a way that during the printing process or doctoring, its lower boundary 2a is at a greater distance from the surface 5 of the printing stencil or the surface to be printed than that Doctor blade 1, more precisely its lower edge.
  • the connection of the doctor element 2 with the doctor blade 1 forms an upwardly closed chamber 4 in the form of a groove open to the surface. This configuration can be seen in the three phases shown in FIG. 2.
  • solder paste 6 is applied to the surface 5 of the stencil 10 in front of the squeegee and the squeegee is moved in the direction of the solder paste (phase 1). Because of this movement and the distance of the lower ones
  • the chamber 4 fills with the paste 6 (phase 2).
  • the excess paste rolls in front of the bow 2b of the doctor element 2 (phase 3).
  • This rolling of the paste corresponds to the functioning of a conventional open doctor system.
  • the paste in the chamber 4 is under pressure due to the constantly pressing material 6, so that the solder paste is introduced from this chamber 4 into the stencil openings (not shown) under increased pressure, as is the case with a closed doctor system.
  • the chamber 4 thus acts as a pressure chamber and the doctor element 2 as a pressure booster - by means of which the pressure on the solder paste is increased.
  • the present squeegee system does not require a further pressure-generating mechanism or further sealing elements and, like an open squeegee system, is easy to handle. To use this multi-stage doctor blade, no structural changes need to be made to the stencil printing machine used.
  • the shape of the pressure chamber 4 and the doctor element 2 is not limited to the shapes disclosed in the present exemplary embodiments. Rather, the geometric shape of this Vary components of the doctor system as long as the mode of operation described above is still achieved.
  • FIG 3 shows an example of a possible embodiment of the present doctor system, in which the doctor blade 1 is formed in one piece together with the doctor element 2.
  • the squeegee holder is not shown in this figure. Rather, this squeegee holder receives the zigzag-shaped clamping edge 7 of the unit consisting of squeegee blade 1 and squeegee element 2.
  • the rear doctor blade 1 and the doctor element 2 connected to it can be seen, on the bow 2b of which the paste or the printable material is rolled.
  • the inner boundary of the pressure chamber 4 with the adjoining lower boundary 2a and the bow 2b of the doctor element 2 is formed in a wave form.
  • Such an embodiment can be easily produced from a deformable metal or plastic material.
  • FIG. 4 shows the composite doctor system with doctor holder 3, doctor blade 1 and doctor element 2 and that between doctor blade 1 and Recognizing doctor element 2 formed chamber 4.
  • the doctor blade 1 and the doctor element 2 are designed as separate components which are held together by the doctor holder 3, which is likewise made in two parts.
  • FIG. 5 represents an exploded view of the individual parts of the squeegee system before assembly.
  • FIG. 6 finally shows a comparison between an open doctor blade system with doctor blade holder 3 and screwed-on doctor blade 1 (left side of the figure) and an embodiment of the present doctor system with doctor blade holder 3 and screwed-on unit comprising doctor blade 1 and doctor element 2 (right side). From this comparison it can be seen that the present doctor system differs from a known open doctor system only in the design of the area of the doctor blade.
  • the squeegee holder can be identical.
  • FIG. 7 shows an example of a printing result that is lower for structures when using a conventional open doctor blade system in connection with a stencil printing technique
  • FIG. 8 shows the printing result when using the present doctor system with the same stencil as was used in the example of FIG. 7.
  • the improved application behavior of the paste with the present doctor blade system improves the degree of filling of the stencil openings, as can be seen from the homogeneously printed out pad 9.
  • Doctor element a lower limit of the doctor element b bow of the doctor element

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Screen Printers (AREA)
  • Electric Connection Of Electric Components To Printed Circuits (AREA)

Abstract

Système racloir doté d'un support (3) de racle et d'une racle (1) fixée sur ledit support, pour appliquer une matière imprimable sur une surface. Ledit système racloir se caractérise en ce qu'un élément racleur (2) est placé devant la racle (1) dans le sens de raclage. Ledit élément racleur (2) est ainsi conçu et relié à la racle (1) qu'en cas d'utilisation idoine du système racloir, il présente, au niveau d'une délimitation inférieure (2a), un écart très légèrement plus grand par rapport à la surface que la racle (1), et il forme avec la racle (1) une chambre (4) fermée vers le haut, si bien que pendant le raclage, d'une part de la matière imprimable est roulée ou poussée devant l'élément racleur (2) et d'autre part, une partie de la matière imprimable pénètre dans la chambre (4) en passant sous l'élément racleur (2). Le système racloir selon la présente invention permet d'obtenir de manière simple de très bons résultats d'impression, même en cas de très petites structures.
PCT/DE2001/002004 2000-05-29 2001-05-25 Systeme racloir destine a appliquer une matiere imprimable sur une surface WO2001091919A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10026441.7 2000-05-29
DE10026441 2000-05-29
DE10120117A DE10120117A1 (de) 2000-05-29 2001-04-25 Rakelsystem zum Aufbringen eines druckbaren Materials auf eine Oberfläche
DE10120117.6 2001-04-25

Publications (1)

Publication Number Publication Date
WO2001091919A1 true WO2001091919A1 (fr) 2001-12-06

Family

ID=26005869

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2001/002004 WO2001091919A1 (fr) 2000-05-29 2001-05-25 Systeme racloir destine a appliquer une matiere imprimable sur une surface

Country Status (1)

Country Link
WO (1) WO2001091919A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015074088A3 (fr) * 2013-11-22 2015-07-16 Technische Universität Wien Dispositif de transformation de matériau photopolymérisable destiné à la fabrication couche par couche d'un élément façonné

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2564337A1 (fr) * 1984-05-18 1985-11-22 Jagenberg Ag Dispositif pour l'enduction de bandes de materiau en defilement
US5027703A (en) * 1990-05-29 1991-07-02 Hancy Raymond E Profile squeegee blade for screen process printing
DE4036726A1 (de) * 1990-11-17 1992-05-21 Hauni Werke Koerber & Co Kg Beschichtungsvorrichtung
US5685221A (en) * 1995-01-12 1997-11-11 Stretch Devices, Inc. Flood bar for screen printing

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2564337A1 (fr) * 1984-05-18 1985-11-22 Jagenberg Ag Dispositif pour l'enduction de bandes de materiau en defilement
US5027703A (en) * 1990-05-29 1991-07-02 Hancy Raymond E Profile squeegee blade for screen process printing
DE4036726A1 (de) * 1990-11-17 1992-05-21 Hauni Werke Koerber & Co Kg Beschichtungsvorrichtung
US5685221A (en) * 1995-01-12 1997-11-11 Stretch Devices, Inc. Flood bar for screen printing

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015074088A3 (fr) * 2013-11-22 2015-07-16 Technische Universität Wien Dispositif de transformation de matériau photopolymérisable destiné à la fabrication couche par couche d'un élément façonné
CN105916667A (zh) * 2013-11-22 2016-08-31 维也纳科技大学 用于将可光聚合材料加工为成型体的以层的方式的构造的设备
US20160288412A1 (en) * 2013-11-22 2016-10-06 Technische Universität Wien Device for Processing Photopolymerizable Material in Order to Construct a Shaped Body Layer by Layer
CN105916667B (zh) * 2013-11-22 2018-05-22 维也纳科技大学 用于将可光聚合材料加工为成型体的以层的方式的构造的设备

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