Coating processes – Fraud or tamper detecting
Patent
1989-10-17
1991-05-21
Bell, Janyce
Coating processes
Fraud or tamper detecting
118 19, 118 20, 118 24, 118303, 118323, 118DIG5, 427213, 427424, 427425, A61K 900, B05D 700
Patent
active
050174010
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a method and apparatus for the coating of mouldings, in which the mouldings are set in a revolving suspending motion along the wall of a holder by means of a spiral gas stream supplied to said holder, and wherein in the zone in which the mouldings are moving a coating material is dispersed.
The prior art methods and apparatuses, see for example U.S. Pat. Nos. 3,251,337 and 4,532,155, German Offenlegungsschrift 3,202,615, are very complicated and/or do not give really good results, and/or are only intended for a very large number of mouldings.
It is an object of the present invention to provide a method and an apparatus for the coating of mouldings, which is very simple, cheap and which can be used for a small number of mouldings.
To this effect, according to the invention, the method is characterized in that coating material is dispersed through a rotating aperture. In this way an optimal spraying technique has been developed.
The invention also relates to an apparatus for coating mouldings having a holder with one or more tangential gas inlets near the bottom and connected to a source of gas supply, which gas inlets are so arranged that each inlet produces a spiral gas stream and which holder has at least one gas outlet near the top, and which apparatus has a feeder for coating material, the outlet of which debouches in the zone wherein the mouldings are moving during operation of the apparatus and which apparatus is characterized in that the outlet of the feeder rotates so as to swivel around with another speed as related to the rotary speed of the mass of the mouldings or capsules in the zone wherein the mouldings are moving during operation of the arrangement.
Further the holder can consist of a lower cylindrically and/or conically widening container and a globular container fitted to the lower container, which globular container has gas outlets near the top around the axis. As a result, the mouldings or modules, in operation, will be moving at the location of the largest diameter in a revolving and tumbling motion. In this way a very simple and cheap method and apparatus for the coating of mouldings is developed. So a revolving gas stream provides the means to move the mouldings and the feeder outlet around in such a way that the coating material can be dispersed onto the said mouldings.
By dismountably fastening the outlet of the feeder for coating material in the upper spherical container or the lower cylindrically and/or conically widening container, it is possible to quickly clean the globular container after use.
BRIEF DESCRIPTION OF THE DRAWING
The FIGURE shows an apparatus usable in the invention.
The invention will now be clarified by means of an example. In a holder A, with two air inlets opposite each other, placed at an angle in relation to the centrepoint, near the bottom, 100 capsules will be inserted.
On the holder a glass sphere C is situated, with an opening to the bottom secured by means of a rim B to prevent air-loss, and air outlets to the top to let the air escape. If air is applied through the air inlets the capsules are lifted and start to rotate inside the glass sphere, due to the upward rotating air movement, the same air movement, the level on which the capsules are moving, and the convexity of the glass sphere causing the capsules to tumble around each other.
A tube D protruding downward from a hole in the centretop of the glass sphere starts to swivel around in the same air-stream with another speed as related to the rotating speed of the mass of the capsules.
If the length of the tube D is chosen in such a way that the swiveling action E of the tube remains short a slight distance from the revolving capsules, this distance, among other things, dependent on the volatility of the liquid to be evaporated, and through this tube a liquid is passed on, the liquid will be sprayed upon the sides of the capsules turned away from the glass wall.
Since the capsules are changing position continuously, they will be evenly provided with the liquid flung from
REFERENCES:
patent: 4740390 (1988-04-01), Kulling
patent: 4886701 (1989-12-01), Ehnert et al.
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