Process and apparatus for treating a strip material in a liquid bath
AssigneeAndritz-Patentverwaltungs-Gesellschaft m.b.H.
InventorsGünther Hiden, Peter Gravert
Life of this patent
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Abstract
A process and apparatus for surface treatment of strip material with liquids, particularly for pickling rolled metal strip, guides the strip through the shallow treatment bath where the metal strip is treated. The treatment liquid medium is sprayed upwardly through nozzles between the bottom of the bath and the strip to be treated, causing a carrying and pulling effect which prevents the strip from contacting the bottom of the bath and prevents the strip from being lifted up from the bath. A plurality of spaced apart spray nozzles introduce a spray of liquid upwardly into the liquid bath to produce alternating high and low pressure zones causing the strip material to travel in an oscillating path.
Claims21
A process for contacting a strip material with a liquid bath, comprising the steps of
- feeding a strip material to a receiving end of a trough and directing said strip material to a discharge end of the trough, said trough including a bottom wall extending from said receiving end to said discharge end and having opposite side walls for defining a strip material contact zone in a bottom section of said trough, said trough containing a liquid bath in said contact zone, and having a plurality of liquid spray nozzles spaced apart in a direction between said receiving end and discharge end;
- conveying said strip material through said contact zone and creating a current of said liquid through said contact zone from said receiving end to said discharge end of said trough;
- spraying a supply of said liquid through each of said nozzles in a substantially upward direction into said contact zone toward said strip material at a force sufficient to prevent said strip from contacting said bottom wall and without lifting said strip from said liquid bath independent of the advancing speed of the sheet material, said liquid being sprayed through said nozzles into said contact zone at a pressure to produce a plurality of alternating high and low pressure zones between said strip material and said bottom wall;
- and
- discharging said material strip from said discharge end of said trough.
An apparatus for immersing and treating a strip material in a liquid bath, the apparatus comprising:
- a trough having a longitudinal dimension with a bottom wall, first and second side walls, a strip material receiving end and a strip material discharge end, said trough being dimensioned to receive a treating liquid and contain a liquid bath;
- a feed device for continuously feeding said strip material from said receiving end to said discharge end through said trough, wherein said trough includes a strip material contact zone proximate said bottom wall;
- and
- at least two liquid spray nozzles in said bottom wall spaced apart along a direction of travel of said strip material, and a liquid supply device for supplying liquid to said nozzles for injecting a spray of said liquid upwardly toward said strip material at sufficient force to form a supporting liquid cushion between said nozzles and to prevent said strip from contacting said bottom wall and without lifting said strip from said liquid bath independent of the speed of said strip material through said liquid bath.
Dependencies are inferred from the claim text.