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US 4,559,896 AGranted
Coating apparatus
AssigneeCiba-Geigy Corporation
InventorsAlfred E. Bossard, Kaspar Kuster
Life of this patent
Estimating the term…
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AssigneeCiba-Geigy Corporation
InventorsAlfred E. Bossard, Kaspar Kuster
Estimating the term…
A pouring head is arranged above a conveyer belt which carries objects to be coated with a coating material being poured from the pouring head in the form of a curtain extending transversely to the direction of travel of the belt. In order to limit the free falling curtain on both sides two rim severing organs are provided on each side of the curtain, one organ above the other, as well as curtain edge-guiding means, one for each severing organ, which are arranged each adjacent the severing organ to which it pertains. The lower severing organs are arranged a short distance above the conveyer belt. The two severing organs comprise blades for cutting off marginal strips from the falling curtain in two successive stages, thus reducing the width of the curtain to a desired size. The lower severing organ serves mainly to cut off the rim bead being conventionally produced on the curtain where it slides downward on the curtain guiding means, thus preventing the occurrence of undesirably thick marginal zones in the coatings produced on the objects being moved underneath the pouring head by the conveyer belt.
A coating apparatus comprising a conveyer belt for conveying objects to be coated, a pouring head device above said conveyer belt and extending transverse to the direction of movement of the latter, said pouring head device comprising a pouring head adapted for pouring coating material in the form of a curtain freely falling on to the objects being conveyed on said belt, lateral curtain guiding means on both sides of said curtain comprising an outwardly inclined section which serves to spread said curtain, and, at least on one side of said curtain directly below said lateral curtain guiding means, a rim-zone severing device for severing a thickened rim zone of said curtain from a central region of the latter, thereby limiting the width of said curtain, said rim-zone severing device being disposed a short distance above the level of impingement of the curtain on the objects to be coated, and being adapted to remove coating material waste from a cut-off rim zone of said curtain, and an edge-guiding member for guiding the resulting narrow-width curtain, said edge-guiding member extending from a point of cutting engagement of said severing device with said curtain downward to closely above said level of impingement of the resulting narrowed curtain on said objects to be coated.
Dependencies are inferred from the claim text.