DE2414657A1 - DEVICE FOR APPLYING LIQUID OR PASTOESE MASSES ON A TRUCK - Google Patents

Description

Device for applying liquid or pasty masses to a web of material

The invention relates to a device for applying liquid or pasty [classes] to a web of material with contamination a roller squeegee.

With l / ask with a round stencil screen printing machine, which with equipped with a magnetically pressed roller doctor blade, it was found that at high pressure speeds and when running out of a printing ink with high toughness, the squeegee is displaced by the resistance of the printing ink in the direction of movement of the Schablaneniuandung became. In order to avoid this effect, which has a decisive impact on print quality, the OE-PS 266 024 a, support body suggested, in the direction of rotation of the Round stencil attached ujurds behind the roller squeegee.

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With this facility one could indeed have a higher printing speed can be controlled, but with a further increase in the printing speed, the squeegee roll became due to the increasing pressure of the color bulge pressed more and more against the supporting body. Through this increases the friction between the roller doctor blade and the support body, their In extreme cases it is related to the friction between the stencil and the squeegee can exceed, so that the squeegee stops and there is a significant drop in print quality.

The same problem also occurs when the Material line without 1 / eru / endun.g of a template takes place, ettua with the whole

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Flat application of an adhesive or the like · Here too it comes yes sometimes to the gathering of larger masses in front of the Eollrakel and to form a rotating bead

The invention is based on the object of the indicated disadvantage to eliminate. This is achieved by having a squeegee in front of the squeegee is arranged and the ink is fed in front of the doctor blade «

In this way, a color bead is formed in front of the squeegee prevents · There is therefore no more significant force that pushes the squeegee away.

Another advantage of the invention can be seen in its application onto an Eundschablonen screen printing machine · It only gets here more a defined amount of color to the squeegee, namely those from the upstream squeegee is imprinted into the openings of the stencil has been. The ink is then printed into the material by the roller.

With the devices used up to now in eotation screen printing, however, especially when printing less absorbent material, e.g. paper, too much ink easily got onto the web, so that relatively long drying intervals had to be observed between the individual printing stations. These drying times can now be significantly shortened due to the better dosage and thus the printing speed can be increased.

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The invention will now be explained in more detail with reference to the drawing. 1 shows an application example of the arrangement according to the invention in a cross-section of an Eundschablonen-Siebdruekmascliine, FIG. 2 shows a further application example in cross section and FIG. 3 shows an application example with magnetically pressed doctor blades and roller blades. The printing ink is supplied via the ink tube 5, exits through openings 9 and, viewed in the direction of rotation of the stencil 1, forms a bead of ink 4 in front of the doctor blade 3 attached to the ink tube the Warenba hn 6 touches the inside of the stencil 1 lounging cleanly and at the same time pushes the ink 4 in the openings of the template 1 · the web 6 lies on the running over drivable rollers pad 7 and takes the template 1 because of the pressing of the Eollrakel 2 with. The pressing of the roller blade 2 is brought about in the present case by the magnetic bar arranged under the pressure pad 7, but could also be done mechanically. The stencil 1, which is set in rotation in this way, conveys the ink 4 located in its openings to the roller blade 2, which presses it onto the web 6.

In contrast to the application example according to Fig. 1, where the doctor blade 3 the template 1 outside the contact zone B of the Template 1 touches the web 6, in the embodiment of Figure 3, the contact of the doctor blade 3 with the

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Template 1 within the contact zone B. With an arrangement According to Figure 3, certain printing effects, such as e.g. softer contours of the pattern can be achieved, while with an arrangement according to FIG. 1 rather sharper contours are achieved will. In addition, the doctor blade 3 in the embodiment according to FIG is attached, and is made of magnetizable material. The pressing of the doctor blade 3 and the roller blade 2 takes place by a magnet system 12 arranged under the pressure pad 7, which is designed as a magnet bar or a magnet roller can be.

However, the invention is not related to the application with screen printing stencils such as round, ribbon or flat stencils limited, for example, it can also be used with success when applying paste-like masses over a large area of a material web, as shown in Fig. 2, for example.

The coating compound, for example an adhesive, is fed in front of the doctor blade and forms a bead V in front of it. The doctor blade is formed by the loop 3 * made of thin elastic material, for example ETickel, and a magnetizable rod 10 inserted ^{into this loop 3 1.} The rod 10 is ^{pressed against the material web 6 by a magnetic bar 8 1} arranged under the printing substrate 7, as a result of which the application compound is doctored off. The application mass now adhering to the surface of the web 6 is then applied by the roller doctor 2,

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which is pressed against the material web by the magnetic bar 8 is pressed deeper into the material web. The loop 3 ¹ is secured at its upper end to the beam 11 ", is maintained the machine frame adjustable in height, not shown in the, in the drawing. By varying the distance between the beam 11 and the web 6, it is possible to order mass more or less abzurakeln and to vary the layer thickness of the order or to achieve a coating layer of desired thickness with the coater blade. In the illustrated embodiment, both for the doctor blade as well as the doctor roll 2, a magnetic bars 8 are each provided 8 ^1, but It is also possible to provide only a small distance between these two squeegees and to press both squeegees with a single magnetic bar 2 and the rod 10 of the doctor blade can be used and the selected cross-sections addicted.

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Claims (5)

Kehl D-7300 Ess'ing en Dipl.-Ing. Hartmut Kehl Scratch Mülbergerstrasse 65 Dipl.-Ing. Volkhard Kratzsch Telephone Stuttgart 0711-3599 92 Deutsche Bank Esslingen 210906 cable «kehlpatent» esslingenneckar. Postal check office Stuttgart 10004 Chase Manhattan Bank New York Johannes Zimmer March 27, 1974 A - 9020 Klagenfurt anuial file 1702 Claims Device for applying liquid or pasty materials onto a web of material using a roller squeegee, characterized in that a coating squeegee is located in front of the roller squeegee (2) (3) is arranged and the ink is supplied in front of the doctor blade (3). 2. Device according to claim 1, characterized in that the doctor blade (5) and roller blade (2) in the template (1) one Round stencil screen printing machine are arranged. 3. Device nach'Anspruch 1, characterized in that even with an arrangement in a round or tape stencil, the coating squeegee (3) and the roller squeegee (2) in the contact zone the template (1) with the web (6) touch the template (1). 4. Device according to claim 1, characterized in that in the case of an arrangement in tape or flat screen printing machines the coating squeegee (3) and the roller squeegee (2) only slightly Have a distance from each other. 409841/0784 24H657 5. Device according to claim 1, characterized in that the doctor blade (3) and the roller doctor blade (2) from magnetisbaren.em Material are made and the pressing of these Bakel by a arranged under the pressure pad (5?) Magnet system (12) takes place. 409841/0 7 84