Coating apparatus – Projection or spray type – With projector heating – cleaning or conditioning
Patent
1984-12-20
1986-06-24
Beck, Shrive P.
Coating apparatus
Projection or spray type
With projector heating, cleaning or conditioning
118 17, 118 19, 118303, B05B 1502
Patent
active
045962057
DESCRIPTION:
BRIEF SUMMARY
The invention pertains to a coating device which, in particular, is equipped with a pivoted drum, such as a dragee coating drum, while in a coating chamber a multitude of spray nozzles for coating compound are arranged, and a cleansing device is allocated to these spray nozzles.
The risk involved with devices of this type is that, following the coating process, the coating compound hardens in the pipe or feed paths. For this reason, the nozzle and feed paths must, if possible, be cleansed immediately following the coating process, which necessitates the conducting of a cleansing liquid through the paths with subsequent blowing out by means of compressed air or cleansing gas. As this, as a rule, must be brought about when the sprayed compound, e.g., a charge of the dragees that are to be coated, is still in the coating chamber, it has always been the case that the entire nozzle arrangement had to be removed from the coating chamber, unless said arrangement was located outside the coating chamber and, therefore, was sprayed only into the coating chamber. This, for instance, can be managed with short coating drums which are primarily carried unilaterally. On the other hand, problems occur with the more recently developed elongated coating drums or other large-scale coating chambers, in which a multitude of spray nozzles is so distributed that already during the spraying process a more or less uniform application is achieved also on a large surface.
The invention is based on the initially defined coating device, and its aim is to design the device in such a way, so as to achieve a convenient and fast, thorough cleansing of the spray nozzle and flow paths of the coating compound, while keeping the overall expenditure to a minimum.
This problem can be solved by arranging at least several spray nozzles within the spraying chamber between a spray and cleansing position, so as to be movable, and screening devices for screening the spray nozzles are provided opposite the outer spraying chamber and draining devices for draining off the cleansing agent sprayed in cleansing position.
At this point, a circulation of the cleansing agent is so provided within the coating chamber that, in one respect, the components, which are to be cleansed, can be flushed as thoroughly as possible without obstructing the normal processes in the coating chamber, i.e., the distribution, drying on, and drying out of the coating compound. Thus the cleansing processes can be executed at relatively short coating intervals, without requiring substantial operational processes. The entire coating program can thus be executed, and the paths of the spraying device can be cleansed while changing the coating compound or at intervals, depending on the applied coating compound and its drying sensitivity, without interrupting the entire program.
This becomes relatively easy, if a group of spray nozzles is attached to a joint, pivoted nozzle carrier, which can be arranged without difficulty on elongated coating chambers, e.g., elongated coating drums.
The screens should have at least one catch basin, which is arranged below the spray nozzle, with draining devices connected to the bottom of the catch basin, particularly with a tilted drain pipe. By this, the drainage of the rinsing or cleansing agent is safeguarded irrespective of the number and, to a large extent, arrangement of the spray nozzles. It is, therefore, also possible to make subsequent modifications to the number and arrangement of nozzles, without having to make major changes to the draining devices.
Here the advantage is that the catch basin is an integral part of a casing tube, which encloses the nozzle arrangement on all sides when in cleansing position, and has at least one sealable coating aperture for the spray nozzles. By this method, a cleansing chamber, which is enclosed by the casing tube, is separated within the coating chamber from the external coating chamber surrounding the casing tube. By this separation the coating and cleansing processes can be executed quite independently.
REFERENCES:
patent: 3876144 (1975-04-01), Madden et al.
patent: 3903839 (1975-09-01), Rowe et al.
patent: 4337282 (1982-06-01), Springer
Beck Shrive P.
Driam Metallprodukt GmbH & Co. KG
Dubno Herbert
Ross Karl F.
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