Coating apparatus – Immersion or work-confined pool type – With means for moving work through – into or out of pool
Patent
1997-06-04
2000-06-06
Lamb, Brenda A.
Coating apparatus
Immersion or work-confined pool type
With means for moving work through, into or out of pool
118423, B05C 300
Patent
active
060713429
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention is directed to the application of a fluid treatment or decoration agent to a continuously moving web. More particularly, it is directed to a device of the type having a drainage plate that spans the width of the web and which is inclined towards the web in a plane generally perpendicular to along or slightly curved with respect to the plane of the web. Such devices include a means for applying the fluid treatment or decoration agent onto the top of the drainage plate. The treatment or decoration agent moves down in a layer corresponding to the drop line above the top of the drainage plate, and gets onto the web from the bottom edge of the drainage plate.
Such devices are known in various variations, such as those which are evident from DE 27 43 742, DE 37 33 996, and DE 39 15 844, for example.
The fluid treatment or decoration agent, for example a dye fluid, moves on the surface of the drainage plate in a thin layer. This thin layer has a relatively large area, at which evaporation takes place, with correspondingly strong cooling of the small amount of fluid mass. Such cooling of the treatment or decoration agent is not desirable, in many cases. In most cases, the treatment or decoration agent has just been brought to an elevated temperature which is the optimum temperature for the treatment effect. As the fluid passes over the drainage plate, this temperature drops in a manner which is difficult to foresee or control.
SUMMARY OF THE INVENTION
The present invention counteracts such temperature decrease by providing a heating device for controlling (i.e., tempering) the temperature of the drainage plate along which the treatment fluid flows so as to thereby control the temperature of that fluid.
Using the heating device, the temperature decrease can be reduced, or, if necessary, a temperature increase of the treatment or decoration agent can even be achieved just before it passes over to the web, depending on how the control provided for is carried out. In this manner, the process can actually be influenced by the temperature control afforded by the instant invention.
In a first embodiment, the heating device can comprise a surface heating element which is connected with the underside of the drainage plate in heat-conductive manner, for example, an electric heating cuff).
In the preferred embodiment of the invention the drainage plate assembly has a double wall, and the space between the walls has a heat carrier medium flowing through it. The flow through this space is along at least two flow paths, in counter-flow, parallel to one another, in order to ensure the most uniform temperature influence possible over the width of the web.
As noted, the drainage plate can be formed of two walls, which lie opposite and parallel to one another. The walls are kept at a distance from and connected with one another by spacer elements. These spacer elements can consist of individual pins, an in particular may take the form of threaded bolts. This is especially suitable where the top surface of the drainage plate is made of sheet metal. The threaded bolts, which have threaded nuts on their exterior, may then be welded onto the sheet metal, and pass through the other of the walls.
According to one alternative embodiment of the invention, heating may be effected via fluid flowing through oppositely arrayed "U" shaped channels located on either side of the web. The channels are bounded by continuous elastic cords that are wound about the pins and which are compressed between the walls to form a seal. By this means flow paths can be formed between the walls, depending on the pattern in which the cord is laid, and these can be sealed towards the outside, in simple manner. The U-shaped flow path consists of two elongated, parallel sides connected by a narrow bridge; the path is set with its longer sides parallel to the web as the connecting bridge is set perpendicular to the web. An inflow port is located at the extremity of one of the long sides, and an outflow port is loc
REFERENCES:
patent: 1891434 (1932-12-01), McKean et al.
patent: 2784583 (1957-03-01), Dungler
patent: 3255617 (1966-06-01), Bisang
patent: 3690297 (1972-09-01), Dentch et al.
patent: 5421884 (1995-06-01), Schafer
Krebs Stefan
Nolden Johannes
Eduard Kusters Maschinenfabrik GmbH & Co. KG
Lamb Brenda A.
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