THE problem is caused by the ROOTS....which are non free flowing and narly shaped and also are considered NEAR SIZE to hole opening AND kinda go thru but, DON'T. oNCE this happens your fines which you want to pass....flow over and end up in your coarse.

It is a pretty small screen, with pretty small eccentric offset, so not a lot of action and not a lot of TOTAL SCREEN OPEN AREA available.

A long slot harp screen would cut cleaner, give more OPEN AREA, finer wire, less likely to BLIND but, may still not solve the prob. May be better suited to trommel type action or other device.

MAKE SURE your drives are all running up to proper RPM, ensure diesel if diesel is not running slow, vbelts are tight if electric and WIRECLOTH is very tightly installed or that will cause blinding. Make sure your wire DIAMETER is NOT TOO THICK or that will cause blinding. Try STAINLESS STEEL that will help eliminate blinding.

Originally Posted by toadspaghetti

I am new to the screening industry and I ran into a problem.

I have an older Powerscreen Mark II set up with a 3/4" screen on the upper deck and a 3/8" on the lower deck. I am running material the is 60% sand and 40% rock less than 3". The problem I am running into is the 3/8" screen is partially "blinding" with very tiny roots and I am getting large amounts of sand mixed with the 3/4" minus. I slowed the feed down to it's slowest point but the problem persists. Will running a harp screen solve this? Any suggestions?

Thanks

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If you have problems with organic matter I would imagine a log washer or spiral classifier in the system.

Regards

Ziggy ■