Coating apparatus – With heat exchange – drying – or non-coating gas or vapor... – To remove or spread applied coating by gas blast
Patent
1993-03-18
1994-09-13
Jones, W. Gary
Coating apparatus
With heat exchange, drying, or non-coating gas or vapor...
To remove or spread applied coating by gas blast
118423, 427348, 427349, 153091, B05C 312
Patent
active
053465512
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for blowing off excessive coating material, particularly fluid zinc or aluminium, in the coating of metal bands by the means of a blowing off jet to impinge by a blowing off medium, of which the jet body is fixed at a base body and of which the jet kips adjustable against each other form a jet slit 10 extending in transverse direction of the metal band.
Such a blowing off device is known from the DE-OS 3619805. By means of such a known blowing off jet the excessive coating agent, especially zinc or aluminium, in the coating of metal bands is blown off along the whole width of the metal band. Hereby results an equal coating of the coating agent over the the whole band width. For such a known blowing off device the blowing off jet has a jet slit along the band width, which can be adapted to the required blowing off conditions by displacement of the jet lips against each other. Besides, the pressure of the blowing off medium is adjustable in the known device to create also thereby most optimal blowing off conditions.
In practical use of the known device it was shown that because of the band vault or bruises of the coating material an equal blowing off process was not sufficiently provided, because in the known device there is always the same pressure over the whole width of the jet slit.
Therefore the invention is directed to improve a device of the above mentioned type so that a blowing off process becomes possible taking into account the bruises of the band to coat.
This object is achieved according to the invention by having a blowing off jet formed as a jet row, providing in transverse direction of the band at least two partial jets to impinge separately on a blowing off medium, especially compressed air, sealed against each other, of which the respective partial slits are adjacent forming a continuous jet slit.
The invention has the advantage that the blowing off jet takes the form of a jet row with single partial jets, whereby each partial jet can be impinged on different pressure to adjust to an optimum the pressure profile along the width of the band to coat. Thereby the variety of working possibilities can be increased sensibly. It is also possible to blow two or more bands simultaneously with one jet row, obtaining different coating layers for each partial band. Besides the solution according to the invention has the advantage to achieve an economic handling with the blowing off medium at disposition, because at such places where less blowing off medium is required a reduction can be made and only such partial jets must be impinged adequately higher where it is necessary. By a concerted cut-off of the individual partial jets a variable adaption to the respective band width can be made.
A preferred embodiment of the invention has to be seen in that each partial jet is made of a first jet half and a second jet half, the first jet half having a channel for leading the blowing off medium to the jet slit and the second jet half being solid so that in an alternating arrangement of the partial jets by exchanging the first and the second jet half in transverse direction of the band the respective second jet half is sealing adjacent to the adjoining first jet halfs.
For this embodiment results an especially simple geometric structure, because for the whole jet row the same structural basic units can be applied which only have to be joined together alternately. The particular advantage must be seen in the solid form of the second jet half serving so simultaneously as seal against the adjacent first jet halfs.
Therefore supplementary sealing elements are not necessary.
Providing sealing plates at both edge regions of the jet row also the partial jets placed in the edge region can be impinged on compressed air separately from the others.
In accordance with another aspect of the invention there is provided another pair of jet lips with another adjustable continuous jet slit along the jet row. Thereby it is secured that the metal band to blow is subjected to a slot jet with exact
REFERENCES:
patent: 3941086 (1976-03-01), Roncan
patent: 4513915 (1985-04-01), Kohler
Dechene Wulf
Heiler Hans-Joachim
Jabs Ronald
Pannenbecker Heinrich
Schmitz Heinrich
Hoffman John
Jones W. Gary
Thyssen Stahl AG
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