Title

A MEANS TO CONTROL SOLUTION STAIN THE SMS DEMAG DRY STRIP SYSTEM

A MEANS TO CONTROL SOLUTION STAIN THE SMS DEMAG DRY STRIP SYSTEM

Authorship

Denker, Dipl. Ing. Wolfgang; ASQ-CQE, Michael J. Peretic; Saxinger, Joseph J.

Denker, Dipl. Ing. Wolfgang

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ASQ-CQE, Michael J. Peretic

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Saxinger, Joseph J.

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DOI

10.5151/2594-5297-0076

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Abstract

Strip surface appearance has become an increasingly important quality attribute in recent years. One particular area of focus has been prevention of the “Solution Stain” that results from rolling fluids coming in contact with the finished sheet after the last pass or stand in cold rolling mills. A number of approaches to blow, wipe and/or squeegee away these fluids have been tried with varying degrees of success. The patented SMS Demag Dry Strip System represents a departure from these more conventional technologies in that its focus is to manage the movement of airborne coolant in a manner that prevents it from falling onto the sheet surface after the sheet exits the roll bite. Dry Strip Systems have been applied in both single stand and tandem mills, rolling ferrous as well as non-ferrous sheet. Systems are readily integrated into new mill designs, and can also be retrofitted into existing mills. This paper will describe several causes of Solution Stain. It will also discuss how the Coanda and Venturi effects are utilized to direct airborne coolant away from the strip. It will conclude by showing the reduction in rejection rates for coils before and after installation of a Dry Strip System.

Strip surface appearance has become an increasingly important quality attribute in recent years. One particular area of focus has been prevention of the “Solution Stain” that results from rolling fluids coming in contact with the finished sheet after the last pass or stand in cold rolling mills. A number of approaches to blow, wipe and/or squeegee away these fluids have been tried with varying degrees of success. The patented SMS Demag Dry Strip System represents a departure from these more conventional technologies in that its focus is to manage the movement of airborne coolant in a manner that prevents it from falling onto the sheet surface after the sheet exits the roll bite. Dry Strip Systems have been applied in both single stand and tandem mills, rolling ferrous as well as non-ferrous sheet. Systems are readily integrated into new mill designs, and can also be retrofitted into existing mills. This paper will describe several causes of Solution Stain. It will also discuss how the Coanda and Venturi effects are utilized to direct airborne coolant away from the strip. It will conclude by showing the reduction in rejection rates for coils before and after installation of a Dry Strip System.

Keywords

dry strip, solution stain, blow-off

dry strip, solution stain, blow-off