Coating apparatus – Immersion or work-confined pool type – Work extending through pool-confining wall area
Patent
1997-03-20
1999-07-27
Lamb, Brenda A.
Coating apparatus
Immersion or work-confined pool type
Work extending through pool-confining wall area
118419, 118424, 118 56, B05C 302
Patent
active
059284242
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for impregnating a web, in particular for impregnating a web laterally guided in the width direction with a treatment of fluid.
An application device with a flat, upright channel which can be filled with treatment liquid, with a sealing arrangement of the type described initially, is actually known from DE-OS 14 60 265. However, in the known embodiment, the web is guided through the flat channel from the top to the bottom, and the squeeze rollers are arranged below the channel. They form a gore in which the treatment fluid which is squeezed off collects, and from which it is passed away laterally and brought back to a collecting tank, from which the supply tank can be refilled. This application device meets the general goal in textile technology of constantly reducing the amounts of treatment liquid in the apparatuses.
However, the arrangement of the pair of squeeze rollers below the supply tank, which is accompanied by filling of the gore with treatment liquid and the necessity of lateral sealing of the gore, is also not advantageous when viewed from the aspect of uniformly squeezing off a selectable application amount, since a certain minimum pressure is required to seal the squeeze nip towards the bottom, which is equivalent to a maximum application amount.
Devices with pairs of squeeze rollers located above the supply tank are generally known in the form of a foulard, e.g. from DE 1 078 527 and DE 1 054 048. Here, the web is passed from above into a trough which is open towards the top and contains the treatment liquid. The web is deflected upward over a deflection roller located near the bottom of the trough. After exiting from the treatment liquid in the trough, the web is squeezed by means of the pair of squeeze rollers arranged above the trough. The liquid which is squeezed off runs back into the trough via a guide surface.
Because of the presence of the deflection roller, the volume of the trough is rather large, for design reasons. It is also known to house displacement elements in the trough, but there is still a significant volume of liquid which must be stored or disposed of after the end of treatment or if the treatment liquid is changed. Careful cleaning is difficult due to the presence of the displacement elements.
Accordingly, an object of the invention is the further development of a treatment device of the type stated, in such a way that the disadvantages of gore formation are avoided.
SUMMARY OF THE INVENTION
These and other objects are accomplished by providing a device for impregnating a web laterally guided in the width direction with a treatment liquid. The device includes a tank for the treatment liquid through which the web is taken on an upright impregnation section, and which is formed by an upright flat channel, the flat sides of which are tightly opposed, which can be kept full up to an optional level. The lower end of the channel is limited by a resilient sealing arrangement bearing on the web from both sides. A pair of squeeze rollers are included, between which the web can be taken. The pair of squeeze rollers is arranged above the tank, and the web can be taken through the tank from bottom to top, and through the pair of squeeze rollers from below immediately after leaving the tank.
While the flat trough of a known foulard can hold the amount of liquid without sealing problems because of its trough shape, for this purpose it requires an interior which can hold the incoming section, the outgoing section of the web and the deflection roller.
This trough is replaced in the present invention by the upright, flat channel through which the web passes only once, from bottom to top, and which is limited, i.e. sealed with regard to liquids, at the bottom end by the sealing arrangement. The seal relative to the moving web replaces the closed design of the trough, where the latter, however, requires the web sections to be passed through twice.
The channel is supposed to be "flat." This means that the clear distance bet
REFERENCES:
patent: 2784583 (1957-03-01), Dungh et al.
patent: 3207616 (1965-09-01), Cohn et al.
patent: 3332260 (1967-07-01), Bisang
patent: 3881445 (1975-05-01), Nothiger
patent: 5195201 (1993-03-01), Schlicht
Krebs Stefan
Nolden Johannes
Eduard Kusters Maschinenfabrik GmbH & Co. KG
Lamb Brenda A.
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