Coating apparatus – Solid applicator contacting work – With work-handling or work-supporting
Patent
1987-12-23
1990-01-09
Beck, Shrive
Coating apparatus
Solid applicator contacting work
With work-handling or work-supporting
118414, 118249, 101363, B05C 108
Patent
active
048920576
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION
This application is a national phase application of PCT/AT/00032 filed 29 Apr. 1987 and based, in turn, upon an Austrian application Ser. No. A 1178/86 filed 30 Apr. 1986 under the International Convention.
A related application is application Ser. No. 07/051,143 filed 4-30-87 now patent No. 4,848,269.
The invention relates to a device for the application of small aamounts of flowable substances to a laminar substrate, e.g. a laminar web of material, by means of an application roller magnetically pressed thereagainst.
BACKGROUND OF THE INVENTION
The application of small or minimal amounts of flowable media to a laminar substrate presents a major problem, if the application is to be completely uniform. On the one hand, it is required to apply exactly the same amount of the medium to each surface unit over the entire width of the web of material and, on the other hand, the contact pressure of the web of material on a support surface must be the same over the entire width of the web.
It is already known to use magnetic wipers for printing or coating of web of material, i.e. roller wipers which are magnetically pressed against the web of material. In these magnetic wipers, from the supply of the medium to be applied, a wedge of flowable substance is formed in front of the magnetic wiper, wherefrom the required amounts of substance are taken.
It is clear that it is not possible in this manner to apply evenly small or minimal amounts of an application medium on a flat substrate, It is also already known to provide a trough with an application roller at the lowest point of the magnetic roller. However, such a trough, located under the magnetic roller is difficult to access and to inspect.
SUMMARY OF THE INVENTION
In accordance with the invention, the device generating the magnetic contact pressure, as well as the application roller are arranged at an angle, deviating from the vertical direction and a device for feeding the substance to be applied is assigned to the application roller.
As a result, when the device for feeding of the substance to be applied is a trough, the area left free for the refilling is readily inspectable and accessible. When this trough is also given the function of a scraper, then only an extremely minimal fluid amount is required for the filling of the trough, approximately 1 liter per meter of length, which is ideal for patterning and the production on a minimal scale, and it is also possible to use easily decomposable substances which are shortlived. A further advantage of the invention is that, when two rollers are laterally arranged, the so-called dosing roller can be of larger dimension, since this roller can be supported and in this way relieved of weight.
When a magnetically pressed application- and/or dosing roller is used, and the same is additionally driven, it is possible to use an axial drive, in addition to the magnetically effected peripheral actuation, and this way a differential speed can be obtained. As a result, a lead of the applicator roller results. In the case of such a lead, there is an additional control of the amount applied, namely an in crease in the amount. Besides, in the case of a lead, a self-cleaning of the applicator- and dosing rollers takes place, since the rollers are slowly wiped off.
BRIEF DESCRIPTION OF THE DRAWING
The above and other objects, features and advantages of my invention will become more readily apparent from the following description, reference being made to the accompanying highly diagrammatic drawing in which:
FIG. 1 is a vertical section of an embodiment of the invention;
FIG. 2 is a vertical section of another embodiment with a special support for the dosing roller;
FIG. 3 is a vertical section of a third embodiment with a single roller;
FIG. 4 is a similar view of a fourth embodiment of the invention, wherein the device generating the magnetic contact pressure is a magnet beam; and
FIG. 5 is a vertical section of a further embodiment.
SPECIFIC DESCRIPTION
According to FIG. 1, in a
REFERENCES:
patent: 3919973 (1975-11-01), Zimmer
PTO 89-1397; English translation of Austrian Patent No. 379,330; Mar. 1989.
Bashore Alain
Beck Shrive
Dubno Herbert
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