TAILIEUCHUNG - Screener troubleshooting: Diagnosing and solving screen problems

Whether your screener scalps, removes fines, or grades material, the machine’s failure can have costly consequences. A torn or otherwise compromised screen can force you to reprocess material, scrap it, or even recall off-spec product. This article will present some of the common causes of such screen problems and possible solutions | Reprinted from Powder and Bulk Engineering December 2007 Screener troubleshooting Diagnosing and solving screen problems JeffDierig Sweco Whether your screener scalps removes fines or grades material the machine s failure can have costly consequences. A torn or otherwise compromised screen can force you to reprocess material scrap it or even recall off-spec product. This article will present some of the common causes of such screen problems and possible solutions. Ascreener also called a separator or sifter is a relatively simple piece of equipment that can handle many different types of dry materials. The screener can scalp oversize material remove fines and divide material into two or more products with specific particle size distributions. The screener has one or more round or rectangular woven-mesh screen attached to a frame in an assembly called a screen deck. A motor drive and motion-inducing equipment such as a vibrator provide motion that helps material move through or off the screen or screens . A single-deck screener moves material that s too coarse to go through a screen off the screen into a discharge outlet. Material that passes through the screen is discharged separately. A multiple-deck screener removes the coarsest material from the upper deck while finer material passes through to the next screen s . Each succeeding deck has a finer screen that removes additional size fractions of the material until only the finest material passes through the lowest screen. The vast majority of screens are made of woven stainless steel wire also called mesh or cloth . The screen is stretched on the frame to provide a specified amount of tension equalized over the entire screen. Four inter-related parameters as illustrated in Figure 1 are commonly used to describe the wire screen wire diameter opening the size of the space between a group of woven wires mesh count the number of wires per linear inch or the number of openings per linear inch and .

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• Screen blinding
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