Coating apparatus – Solid applicator contacting work – Movably mounted applicator
Patent
1993-12-15
1995-11-14
Hastings, Karen M.
Coating apparatus
Solid applicator contacting work
Movably mounted applicator
118209, 118249, B05C 114
Patent
active
054662923
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for coating a web of paper passing over a backing roll. The apparatus includes a belt which is guided around a support. The belt is driven to move coating composition from a supply thereof to a nip where the belt meets the web at the backing roll. The support supports the belt at the nip against the web to apply the coating composition there to the web. Such an apparatus is known from German Unexamined Application for Patent 4100771. By means of a support roller of relatively small diameter, coating is applied to the web by a belt which wraps around said roller in a nip which is formed along a backing roll which guides the web. In this connection, it is favorable, for the support roller to have a relatively small diameter in order, in this way, to guide the belt with a relatively small radius of curvature at and through the application nip. Of course, certain support structures are required for the support roller in order to be able to adjust the coating nip relatively precisely. The nip should have a width, for instance, of between 0.1 and 1.5 mm.
SUMMARY OF THE INVENTION
The object of the invention is to provide supporting devices for the support roller.
BRIEF DESCRIPTION OF THE DRAWINGS
This object is achieved in accordance with the invention wherein the support member comprises a roll of relatively small diameter as compared with the drive roll or the guide rolls for the belt. At least one further roll and perhaps two of them in turn support that supporting guide roll at the nip and provide more uniform force across the web at the nip. The invention will be explained below with reference to the embodiments shown in the figures of the drawing in which (in each case diagrammatically) there are shown:
FIGS. 1 and 2, show two embodiments of a first basic development of the invention;
FIG. 3, a view of a second basic development of the invention, and
FIGS. 4 and 5, in each case, are variants of FIG. 3.
DESCRIPTION OF PREFERRED EMBODIMENTS
Referring to FIG. 1, the web of paper B is guided in the region of the applicator by a backing roll 5. The applicator has a flexible belt 2 of plastic, rubber or rubber-like plastic. The belt is guided over two guide rollers 4 and 4' which are arranged in such a position that their highest point is located above the level of a trough 12 which receives the coating composition. The belt 2 is further guided over a support roller 6 where the coating nip 7 with respect to the backing roll and traveling web is formed. The support roller 6 may advantageously have a diameter in the range of between 20 and 250 mm, and preferably between 40 and 150 mm. For the supporting of the support roller 6, there is provided supplemental support roller 10 having a diameter which is relatively large as compared with that of the support roller 6 and is within the region of the diameters of the guide rollers 4 and 4'. In this connection, at least one of the guide rollers is driven and serves to drive the belt 2 with the speed which it is to have in the coating nip. The speed of the web should preferably be more than 1000 m/min. The speed of the belt 2 should be adjustable and be between 5 and 100%, and preferably between 5 and 30%, of the speed of the web in case of the same direction of movement or between 5 and 30% of the speed of the web in case of the opposite direction of movement. The supplemental support roller 10, which supports the support roller 6, should also preferably be driven with a circumferential speed corresponding to the circumferential speed of the support roller (and therefore, in the event of the same diameter of the large rollers wrapped by the belt 2, with the drive speed of the driven guide roller 4).
In accordance with FIG. 2, the supplemental support roller 10 is supported by the guide rollers 4 and 4'. In this case, of course, the supplemental support roller 10 can have a relatively small diameter since it is supported, in its turn, by the guide rollers. If, for example, in accordance wi
REFERENCES:
patent: 1268891 (1918-06-01), Stommel
patent: 1818911 (1931-08-01), Savy
patent: 2044281 (1986-06-01), Clark et al.
patent: 3308737 (1967-03-01), Fukuda
patent: 4006052 (1977-02-01), Wang
patent: 4705161 (1987-11-01), Gozdiff
Edwards Laura E.
Hastings Karen M.
J.M Voith GmbH
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