Material Screening
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Orbit Screens, Inc. - 722 3rd Street - Delhi, Iowa 52223 - 563.922.9230 -

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Screening Difficult Materials

Compost - Sod - Top Soil with Weeds and Grass

Weeds and grass pose no big problems as they will quickly be sorted out and deposited in two piles.

Weeds/Grass What to Watch For:

If the material is full of roots, some of the good dirt will go out with the roots.

Simply run it through again to finish breaking up the root balls and sortingout of good material.

Old fence rows, ditch banks etc. will yield great top soil to sell.

Log Yard Waste
Weeds/Grass Very impressive but could be a problem

These photos show (Photo 1) on the far right a pile of
log yard waste. It includes dirt, decayed wood and
larger pieces of wood. In the area near the loader is
the overs while at the center between the piles is
the screened (3/4”) dirt and decayed wood.
Photo 2 shows a close up of the overs which screened out very easily.

Trouble can arise, however if the longer pieces of wood are much longer. What you see here is about maximum length before trouble may start.

If a longer stick stands up and then lodges between the feeder conveyor and the screen dish, it may poke a hole through the screen.

Obviously, a light wire, small hole screen is more vulnerable than a larger opening, heavy wire screen.

Screening Sand and Rocks
Screen wear and/or damage is effected by the shape of the rocks, concrete or asphalt.  Round rocks are much easier on the screen then rocks with sharp corners. Therefore, be informed that heavier screen wire is required for sharper shaped rocks, concrete or

Rock Effect On Conveyors

Small rocks, 1/2” through 2” getting into the chain link and jamming at the sprocket is remedied with rock guards on the single chain conveyors. Belts or double chain conveyors are not subject to jamming with small rocks.

Sand Problems

Single or double chain conveyors are not recommended for sand as accelerated wear may
occur. To minimize problems with the overs conveyor, do not screen sand with less than a 1/2” screen and do not over feed causing sand to be discharged into the overs conveyor.  A belt fines conveyor is best for sand and should always be recommended.

In general, the chain conveyors will address the widest range of operating conditions. The available conveyor
options may be selected to improve operating results for specific applications.

Trash and Long Stringy Roots
Shows material that should be removed prior
to loading in the hopper.  The long pipe is sure to
cause the screen to stop

Shows the type of material being screened out. The pile on the right was successfully carried up the overs conveyor. The small pile close to the machine was long, flexible roots that coiled up into a ball and had to be pulled out by hand.

Basswood Bark
Ground wood such as materials ground in a hammer mill may have long wood fibers with the
small particles mixed in.

These materials are hard to separate, even if you try to shake the fines out by shaking a hand full.
Note the long stringy and frizzy strands of material.
While screening is possible, it takes attention to detail.
In this case, new material must be fed into the screen at the very top (11:00) position.

If the customer has a way to feed at the top, such as a
grinder discharge conveyor, it may be worth a try.
Do not expect big production volumes

About a Grizzly
You will hear folks talking about a “Grizzly”, so here are photos of one.

It is simply spaced bars welded to a frame which material is dropped on from a loader bucket. The big rocks will not pass through the bars and small particles mixed in will.
The smaller particles do pass through and can be
retrieved from the rear.
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Screening Difficult Material
Orbit Screens, Inc.
722 3rd Street

P.O. Box 345
Delhi, Iowa 52223
Phone: 563.922.9230 * Fax: 563.922.9060

Orbit Screens® is a Registered Trade Mark of Orbit Screens, Inc. 

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