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| The screen opening (aperture) is determined by the
desired product size with consideration of several other factors such as the percentage of
oversize material allowed to pass through the screen, deck vibration frequency and
amplitude. |
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| Another very important factor is the deck angle of
incline. |
| The greater the angle of inclination, the smaller
the apparent aperture. |
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| Once the aperture (opening) has been determined,
the wire diameter is selected in consideration of screen impact (drop height to screen
from feed chute, hopper or conveyor discharge), and maximum size (oversize) of
material feed. |
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| The relationship between screen aperture size and
wire diameter determines the amount of Open Area. |
Production (throughput) increases in
proportion to greater open area while screen service life decreases.
|
Screen service life increases in proportion to a
decrease of open area while production decreases.
|
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| Woven wire cloth screening surfaces are typically
woven of high carbon steel or oil tempered steel although stainless steel is often used in
applications such as food or pharmaceuticals. Stainless is frequently utilized
in smaller apertures having a mesh count greater than 10. |
| |
| Generally, vibrating deck screens are produced in
accord with space cloth standards. Smaller apertures
are produced in accord with bolting cloth, mill grade or market grade
specifications, determined by the open area requirements. |
| |
| Screens are attached to a vibrating deck by hook (clamping) strips running the length of the
screen section, one on each side. The hook strips are tensioned by clamping rails
attached to the sides of the vibrating deck which pull the screens tight against the
crowned surface of the vibrator. For
additional information see
installation tips |
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| Related Topics: |
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