EP0408704B2 - Installation d'application de substances sur une bande de materiau - Google Patents

Installation d'application de substances sur une bande de materiau Download PDF

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Publication number
EP0408704B2
EP0408704B2 EP90901724A EP90901724A EP0408704B2 EP 0408704 B2 EP0408704 B2 EP 0408704B2 EP 90901724 A EP90901724 A EP 90901724A EP 90901724 A EP90901724 A EP 90901724A EP 0408704 B2 EP0408704 B2 EP 0408704B2
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EP
European Patent Office
Prior art keywords
doctor
profiled
arrangement according
strip
magnet
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
EP90901724A
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German (de)
English (en)
Other versions
EP0408704A1 (fr
EP0408704B1 (fr
Inventor
Johannes Zimmer
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
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Priority claimed from AT3389A external-priority patent/AT392925B/de
Priority claimed from AT211289A external-priority patent/AT392746B/de
Application filed by Individual filed Critical Individual
Publication of EP0408704A1 publication Critical patent/EP0408704A1/fr
Publication of EP0408704B1 publication Critical patent/EP0408704B1/fr
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Publication of EP0408704B2 publication Critical patent/EP0408704B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B41F15/40—Inking units
    • B41F15/42—Inking units comprising squeegees or doctors
    • B41F15/426—Inking units comprising squeegees or doctors the squeegees or doctors being magnetically attracted
    • 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
    • B41F15/46—Squeegees or doctors with two or more operative parts

Definitions

  • the invention relates to an arrangement for applying substances to web-shaped material (application surface), comprising a doctor blade which can be pressed magnetically onto the application surface or a stencil by means of a working magnet and a profiled strip arranged at a fixed, in particular adjustable distance from the application surface, with a lower surface facing the application surface and at least one side surface extending transversely to the lower surface and transversely to the application surface, at least one holding magnet being arranged in the profile strip, by means of which the squeegee is lifted off the application surface or template when the working magnet is reduced and held on the profile strip by means of a contact surface assigned to the holding magnet becomes.
  • a so-called ink jam bar seen in the direction of movement of the web, is arranged in front of the roller squeegee and this ink jam bar influences the application process depending on the dimension and location, ie distance from the application level.
  • a disadvantage of this prior art is that in the event of an interruption in operation, the doctor element and the profiled strip have to be handled separately, which requires a greater amount of work and that there is a risk when using doctor rollers, in which the ratio between diameter and length is very large that the doctor blades are bent and then can no longer be used. The smaller the diameter and the greater the length, ie in the case of large working widths, the greater the risk of bending and the more carefully the doctor blades must be handled.
  • a generic device is known from DE-A-24 37 006.
  • a ink jam bar which is in the doctor blade mode magnets must be spaced from a roller squeegee arranged.
  • the underside of the ledge must go through Lowering brought into contact with the roller squeegee and then be lifted together with the latter.
  • the invention aims to address the disadvantages of the prior art Technology eliminating arrangement are created in which the Squeegee and the profile bar not only for cleaning as a unit are manageable, but also during doctor operation form a functional unit, with the additional risk of bending largely of doctor blades with a small diameter should be avoided.
  • the objectives of the invention are in connection with the Characteristics of the arrangement mentioned in the introduction achieved that the squeegee or an element holding it in on the application surface or squeegee working position pressed onto the template at a forming the contact surface Profile strip side faces and that every holding magnet at a distance from the lower end of the profile bar in this way is inserted that he was the Squeegee when the working magnet is switched off under Pressure on the profile strip side surface and under Sliding or rolling system this from the application area or the template lifts off, holding onto the profile strip side surface and in a rest position resting on the profile strip side surface brings.
  • the invention has made it possible Doctor element and profile strip as a functional unit handle. It is also no longer required at a production interruption either the template movement to interrupt, or the doctor elements to remove from the templates, but characterized in that the doctor element in the event of production interruption the stencils can be lifted be rotated further without this being disadvantageous would have consequences. Self-positioning also occurs the profile bar and thus the doctor element one and it is now possible to have the most varied Use types of doctor elements and also optionally with roller blades of various diameters to work.
  • FIGS. 4 and 5 to 8 are further embodiments the invention, as well as the Fig. 9 and 10.
  • a device in the simplest design.
  • a web in the direction of movement 3 4 is a profile bar 6 pivotally arranged.
  • the Magnetic strip 7 or the series of magnets completely surrounded by the material of the profile bar 6.
  • the profile bar 6 is on as a material feed trained tube 10 attached and the pivoting can be done about the axis 12 of the tube. How one can see from the drawing that ends Profile bar 6 in front of a template 5 or at a distance to the web 4.
  • the pivotability can also be given a height adjustment to adapt to different material thicknesses or to ensure roll diameter.
  • a roller doctor 9 On the front surface 8 of the profile strip in the direction of movement 6 is a roller doctor 9, which is in the operating state from the working magnet 2 to the template 5 or is pressed against the web 4. Becomes the working magnet 2 switched off in the magnetic table, the occurs Magnetic strip 7 in operation and the doctor blade 9 is from the template 5 or Web 4 lifted and lifted in this State of the magnetic bar 7 on the surface 8 held, i.e. the doctor roller 9 is both in the operating state (full lines) as well as when switched off Condition (shown in dashed lines) on surface 8 pressed, regardless of how large the diameter the doctor blade is so that this diameter can be selected down to 3 mm. The smaller the diameter or less the weight, all the more doctor element 9 is held more firmly and securely, even when washing the device.
  • a doctor element 13 is provided on the rear side 11, so that the device also as a traffic jam or Leakage can be used. Because the Profile bar 6 is pivotable during the Operating state of the substance jam angle before Doctor roll 9 and thus the order result changed will.
  • a doctor roll 9 or 13 is provided on the front surface 8 also on the rear surface 11 .
  • a doctor roll 9 or 13 By slight pivoting can either the doctor blade 9 or brought the doctor blade 13 over the center of the magnetic table be in working condition on the template 5 or web 4 are pressed.
  • the doctor element 9 or 13 which is not used is replaced by the magnetic bar 7 from the template 5 or Web 4 lifted off and lifted off in this Condition kept.
  • the profile bar 6 incorporated a width distribution device 15, i.e. Channels that branch and their Diameter becomes smaller and smaller, then the Substance via the outlet 14 in the area in front of the Profile bar 6 is coming.
  • a doctor element 13 on the rear side 11 of the profile bar 6 used, so can also have a stop bracket 16 be present, as shown in Fig. 3 in more detail.
  • the end part of the profile bar 6 formed as a nose 17 and provided with a curve.
  • a support 18 is attached to the profile bar 6. This attachment can be mechanical, e.g. by a screw or even through the holding magnet 7.
  • a rod 19 is inserted into the carrier 18, which rotates the actual doctor element 9, but bears vertically.
  • the magnetic holding bar lifts the doctor element 9 in the dashed, i.e. withdrawn, position.
  • the rotation-disabled stopping of round bars is an inventive measure that is surprising Effect. Stopping the role, i.e. so the functional conversion of a doctor blade in a round rod, has one depending on the substance measurable change in the quantity applied Consequence, so that the technologically high quality doctor blade application technology thereby even more flexible and varied in applicability without there is a noteworthy cost. It is of course also possible to use the doctor element to train as a stick on the surface 8 is raised and lowered smoothly. Another Possibility is to use a round profile bar with preference very small diameter with rotation to connect a profile bar of rectangular cross-section, which is loosely arranged in a holder and is secured against tipping.
  • Fig. 5 shows another embodiment.
  • a profile body 20 This carries a doctor blade 21 which is attached to the Template 5 or the web 4 is pressed. Further there is a groove 22 in the profile body 20, which forms the receiving space for a doctor roller 9.
  • the substance is made through breakthroughs 23 introduced.
  • the doctor blade 21 Steel or plastic, the order quantity and - quality controlled. This facility is special for thin substances and for small ones Quantities advantageous.
  • the doctor blade 9 can be the effective exit slot for the substance to the template 5 or to the web 4 set.
  • the exit slot is designated 24.
  • FIG. Another embodiment is shown in FIG. Here are two magnetic strips or rows of holding magnets 7 and 25 available.
  • a doctor element 13 are held.
  • the individual Holding magnets narrower than in the embodiments 1 and 2 are made and thus closer provided on the corresponding contact surfaces 8 and 11 will. This will make the magnets come better to the effect.
  • the contact surfaces in the contact area of the doctor element 9 or 13 also to be arched.
  • Width distribution tube 28 is present, which is fed in the middle and the substance via the outlets 14 delivers.
  • Figure 7 is another embodiment of the invention.
  • a recess 31 in the profile bar 6 incorporated, in which a doctor blade 13 is also located.
  • the holding magnet 7 between the recess 31 and the front surface 8 causes both the Squeegee on the surface 8 as well as the squeegee in the recess 31 when the working magnet is switched off the adjacent surface pressed and from the template 5 or the web 4 lifted off becomes.
  • the recess 31 can also be similar to a plain bearing be trained.
  • a second holding magnet be on the squeegee 13th acts above the recess 31 there is a second holding magnet be on the squeegee 13th acts.
  • Fig.8 shows an embodiment in which the Profile bar 6 is provided with an additional bar 33, which carries a blade 34 at its lower end and so limited a color space 32. There is one in the color space rotationally fixed round rod doctor blade 35 is provided.
  • the doctor element e.g. the doctor roller 13 the rear surface 11 of the profile bar 6 rests, can the lower surface 36 of the profile bar 6 as a storage surface be used.
  • a pressure is exerted by this storage area, which supports the application process.
  • Due to the pivotability the profile bar 6 can during Operating state of the substance jam angle before Doctor element, i.e. the area 36 and thus the order result changed be there through this Substance congestion angle is the one exerted on the material Pressure can be controlled and therefore the per unit area applied amount of material checked can be.
  • the doctor blade can in accordance with the embodiments 3, 5, 7, 8, 9 and 10 on one of the two Inner walls of the incorporated in the profile bar 6 Sealing recess in the operating state apply so that the penetration of application substance seen from the direction of movement 3, application area in front of the doctor element, at the end of which the doctor element rests, not in those behind the doctor element 9, 13, 20 and 35 Area of the application area.
  • the invention has various Use types of squeegees, even the The advantage of lifting the squeegee when production is interrupted the templates continued to rotate self-positioning also occurs the profile bar 6 and thus the squeegee. Man can be used with a variety of roller blades Working diameter and cleaning and handling is practically like a "one-piece" Device.
  • doctor blade profile strip 201 which with a flexurally elastic and thus ever Brushable edge that can be deformed according to doctor pressure 34 is provided.
  • the bar 43 is the permanent magnetic Bar 7 or, this functionally the same, one Row of holding magnets arranged side by side used so that the bar 201 outside of the operating state on the surface 50 magnetic is pinned.
  • 10 shows a further possible embodiment.
  • the narrow range of motion 52 is a small diameter doctor blade roller inserted, the - marked with 9 - the application operating status and - designated 9 '- those of the Application level or template loosened magnetically pinned position shows. With 7 'is the holding magnet arrangement shown.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Coating Apparatus (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Paper (AREA)
  • Machines For Laying And Maintaining Railways (AREA)
  • Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)
  • Unwinding Webs (AREA)
  • Seal Device For Vehicle (AREA)

Claims (23)

  1. Installation d'application de substances sur un matériau en forme de bande (4) (surface d'application) comprenant une râcle (9, 13) applicable par un aimant de travail (2) par magnétisation contre la surface d'application ou un gabarit (5) et une barre profilée (6) disposée suivant un écart fixe, notamment réglable en face de la surface d'application (4) avec une surface inférieure (36) orientée vers la surface d'application (4) et au moins une surface latérale (8, 11, 26, 50) s'étendant transversalement à la surface inférieure (36) ainsi que transversalement à la surface d'application (4), où il est disposé dans la barre profilée (6) au moins un aimant de maintien (7, 25) au moyen duquel la râcle (9, 13), lorsque l'aimant de travail (2) est hors service, peut être soulevée de la surface d'application (4) respectivement du gabarit (5) et est retenue par une surface d'application associée à l'aimant de maintien (7, 25) à la barre profilée (6), caractérisée en ce que la râcle (9, 13), en position de travail de râcle appliquée par pression à la surface d'application (4) respectivement au gabarit (5), s'applique à une surface latérale de barre profilée (8, 11, 26, 50) formant la surface d'application et en ce que chaque aimant de maintien (7, 25) est inséré à une certaine distance de l'extrémité inférieure de la barre profilée (6) de telle façon dans celle-ci qu'il soulève la râcle (9, 13) lors d'une mise hors service de l'aimant de travail (2), par une application à la surface latérale de barre profilée (8, 11, 26, 50) et sous une application à glissement ou à roulement à celle-ci de la surface d'application (4) respectivement du gabarit (5), ce faisant la retient à la surface latérale de barre profilée (8, 11, 26, 50) et l'amène dans une position de repos s'appliquant à la surface latérale de barre profilée.
  2. Installation selon la revendication 1, caractérisée en ce que l'aimant de maintien (7) dans la barre profilée (6) est un aimant permanent.
  3. Installation selon la revendication 1 ou 2, caractérisée en ce que la râcle (9, 13) est un rouleau, une tige ronde ou une tige profilée (201) ayant, par exemple, une section transversale rectangulaire et une arête profilée de râcle (21).
  4. Installation selon l'une des revendications précédentes, caractérisée en ce que la surface d'application de la barre profilée (6) formée par les surfaces latérales de barre profilée présente de préférence dans la région où la râcle (9, 13) s'applique en position de travail à la barre profilée (6), des rainures qui s'étendent perpendiculairement ou de manière oblique relativement à l'axe de la râcle (9, 13).
  5. Installation selon l'une des revendications précédentes, caractérisée en ce que la râcle est une râcle roulante dont la surface est structurée.
  6. Installation selon l'une des revendications précédentes, caractérisée en ce que la barre profilée (6) peut être pivotée autour d'un axe qui s'étend parallèlement à l'axe de la râcle (9, 13) respectivement à l'arête profilée de râcle (21) de la tige profilée (201).
  7. Installation selon l'une des revendications précédentes, caractérisée en ce qu'il est prévu dans la barre profilée (6) un évidemment (31) ou que la barre profilée présente un élément de retenue en forme de cage (16) dans lequel est disposée une râcle (9, 13).
  8. Installation selon la revendication 7, caractérisée en ce que la barre profilée (6) porte sur sa surface latérale arrière un élément de retenue en forme de cage (16) dans lequel est prévue une râcle (9, 13).
  9. Installation selon la revendication 7, caractérisée en ce qu'il est disposé au-dessus de l'évidemment (31) au moins un aimant supplémentaire.
  10. Installation selon la revendication 7 ou 9, caractérisée en ce que l'évidemment (31) est réalisé à la manière d'un palier à glissement et entoure une partie de la surface du rouleau formant râcle (9, 13).
  11. Installation selon l'une des revendications précédentes, caractérisée en ce que la râcle est réalisée sous forme de rouleau (9, 35) et est assurée à l'encontre d'une torsion par une broche (figures 4, 8).
  12. Installation selon l'une des revendications précédentes, caractérisée en ce qu'un évidemment (32) servant de logement à la couleur est délimité devant la barre profilée (6) par une barre supplémentaire (33).
  13. Installation selon l'une des revendications précédentes, caractérisée en ce que l'évidemment (31, 22) entoure plus de la moitié de la surface de pourtour d'un rouleau ou d'une tige ronde de râcle d'un plus grand diamètre tandis que des rouleaux formant râcle ou éléments de râcle d'enduction dont le diamètre est inférieur à la largeur de la fente de l'évidemment sont maintenus seulement par un ou plusieurs aimants de maintien (7).
  14. Installation selon l'une des revendications précédentes, caractérisée en ce que, au moyen de l'aimant de travail (2) et de l'aimant de maintien (7), la râcle, en fonction de travail, s'applique par magnétisation à deux surfaces.
  15. Installation selon l'une des revendications précédentes, caractérisée en ce que, par pivotement de la barre profilée (6), la râcle (9) peut être amenée à une surface latérale (8) de la barre profilée (6) ou une râcle (13) à la surface latérale opposée (11) de la barre profilée (6) en position de travail respectivement de repos.
  16. Installation selon l'une des revendications précédentes, caractérisée en ce que l'aimant de travail (2), respectivement le champs magnétique produit par celui-ci est suffisamment large, pour pouvoir attirer en même temps deux rouleaux formant râcle (9, 13) espacés l'un de l'autre (figure 2).
  17. Installation selon l'une des revendications précédentes, caractérisée en ce que la barre profilée (6), le cas échéant avec des barres profilées additionnelles (20, 33), fixées sur celle-ci présentent un évidemment en forme de rainure (22, 32, 52) dans lequel est posé ou mis en place l'élément formant râcle (9, 13, 201, 35).
  18. Installation selon l'une des revendications précédentes, caractérisée en ce que la barre profilée (6) est réglable en hauteur par un support transversal (10), c'est-à-dire qu'elle est disposée de manière à pouvoir changer sa position locale par rapport au plan d'application.
  19. Installation selon l'une des revendications précédentes, caractérisée en ce que l'élément formant râcle (9, 13, 35, 201) s'applique d'une manière étanche dans l'état de fonctionnement contre l'une des deux parois internes d'un évidemment (22, 32, 52) pratiqué dans la barre profilée (6) de sorte que le matériau d'application ne peut pas passer de la zone d'application qui se situe, en regardant dans la direction de déplacement (3), devant l'élément formant râcle, à l'extrémité de laquelle l'élément formant râcle est en application, dans la zone de la surface d'application située derrière l'élément formant râcle (9, 13, 35, 201).
  20. Installation selon l'une des revendications précédentes, caractérisée en ce qu'une barre profilée (201) formant un élément de râcle présente une arête élastique ou porte une lame (21).
  21. Installation selon l'une des revendications précédentes, caractérisée en ce que l'élément formant râcle est réalisé de façon à répondre à la flexion, par exemple, par des entailles.
  22. Installation selon l'une des revendications précédentes, caractérisée en ce que deux éléments formant râcle étroits sont prévus l'un à coté de l'autre et les deux peuvent être appliqués par magnétisation.
  23. Installation selon l'une des revendications précédentes, caractérisée en ce que la barre profilée (201) formant un élément de râcle présente une arête de travail élastique (21) qui, lorsque la force de travail est modifiée, peut être déformée et que dans le cas d'une modification, également le coin de couleur influençant l'effet d'application de la couleur, dans cette zone élastique déformée par la force d'application, peut également être modifiée quant à sa forme en section transversale, respectivement son angle d'ouverture ou son volume récepteur de substance.
EP90901724A 1989-01-09 1990-01-05 Installation d'application de substances sur une bande de materiau Expired - Lifetime EP0408704B2 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
AT3389A AT392925B (de) 1989-01-09 1989-01-09 Auftragungsmaschine bzw. -vorrichtung zum beschichten, impraegnieren oder bemustern von bahnenfoermigem material
AT33/89 1989-01-09
AT2112/89 1989-09-08
AT211289A AT392746B (de) 1989-09-08 1989-09-08 Anordnung zum auftragen von substanzen auf bahnfoermiges material
PCT/AT1990/000002 WO1990007387A2 (fr) 1989-01-09 1990-01-05 Installation d'application de substances sur une bande de materiau

Publications (3)

Publication Number Publication Date
EP0408704A1 EP0408704A1 (fr) 1991-01-23
EP0408704B1 EP0408704B1 (fr) 1993-06-16
EP0408704B2 true EP0408704B2 (fr) 1998-07-15

Family

ID=25591186

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90901724A Expired - Lifetime EP0408704B2 (fr) 1989-01-09 1990-01-05 Installation d'application de substances sur une bande de materiau

Country Status (9)

Country Link
US (1) US5151132A (fr)
EP (1) EP0408704B2 (fr)
AT (1) ATE90595T1 (fr)
BR (1) BR9004513A (fr)
CZ (1) CZ280958B6 (fr)
DD (2) DD291508A5 (fr)
DE (2) DE59001764D1 (fr)
ES (1) ES2041524T5 (fr)
WO (1) WO1990007387A2 (fr)

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DE9103571U1 (de) * 1991-03-21 1992-07-23 Zimmer, Johannes, Klagenfurt, Kärnten Rakelgerät
DE59106731D1 (de) * 1991-03-21 1995-11-23 Johannes Zimmer Rakelgerät.
DE9103570U1 (de) * 1991-03-21 1992-07-23 Zimmer, Johannes, Klagenfurt, Kärnten Rakelgerät
GB2259262B (en) * 1991-09-03 1995-04-12 Univ Hull Blade control system
JP3345653B2 (ja) * 1993-05-12 2002-11-18 谷電機工業株式会社 スクリーン版クリーニング装置
NL9301820A (nl) * 1993-10-20 1995-05-16 Stork Screens Bv Rakelsamenstel.
DE29517098U1 (de) * 1995-10-17 1997-02-13 Zimmer, Johannes, Klagenfurt Auftragungsvorrichtung
US5925187A (en) * 1996-02-08 1999-07-20 Speedline Technologies, Inc. Apparatus for dispensing flowable material
US5938106A (en) * 1996-08-01 1999-08-17 International Business Machines Corporation Method and apparatus for applying solder and forming solder balls on a substrate
US6066206A (en) 1997-02-21 2000-05-23 Speedline Technologies, Inc. Dual track stenciling system with solder gathering head
DE19735026C1 (de) * 1997-08-13 1999-05-27 Freudenberg Carl Fa Vorrichtung zur Beschichtung einer Materialbahn mit einer Paste
NL1011992C2 (nl) * 1999-05-07 2000-11-09 Stork Brabant Bv Rakelinrichting.
JP4365479B2 (ja) * 1999-05-18 2009-11-18 東北リコー株式会社 孔版印刷装置
DK2059392T3 (da) * 2006-08-29 2010-10-04 Daetwyler Swisstec Ag Rakel
CN113140403B (zh) * 2021-04-23 2023-03-10 江西粤磁稀土新材料科技有限公司 一种钕铁硼生产用便于整理的粘料机

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NL155759B (nl) † 1967-05-26 1978-02-15 Zimmer Johannes Inrichting voor cilindersjablonen met een over de binnenwand van de sjabloon rolbare, magnetiseerbaar materiaal bevattende afstrijkwals.
DE2437006A1 (de) † 1974-08-01 1976-02-19 Zimmer Johannes Einrichtung zur regelung der anpresskraft eines magnetwalzensystems
DE3416029A1 (de) † 1983-05-24 1984-11-29 Zimmer, Johannes, Klagenfurt, Kärnten Rakelgeraet fuer flachschablonen mit zwei im abstand zueinander angeordneten rakelleisten
EP0311728A1 (fr) † 1987-10-10 1989-04-19 Johannes Zimmer Dispositif de raclage

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Melliand Textilberichte 68 (1987) Seiten 351-352 †
Prospekt "KOMBI-RAKEL", Johannes Zimmer, 1975 †

Also Published As

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ATE90595T1 (de) 1993-07-15
DD291508A5 (de) 1991-07-04
EP0408704A1 (fr) 1991-01-23
DD298491A5 (de) 1992-02-27
DE59001764D1 (de) 1993-07-22
CZ280958B6 (cs) 1996-05-15
EP0408704B1 (fr) 1993-06-16
ES2041524T3 (es) 1993-11-16
ES2041524T5 (es) 1998-10-16
BR9004513A (pt) 1991-07-30
DE9000148U1 (de) 1990-04-12
WO1990007387A2 (fr) 1990-07-12
WO1990007387A3 (fr) 1990-11-01
US5151132A (en) 1992-09-29

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