Banana screen

Jul 07, 2020

Banana (Multi-slope) screens have become widely used in high-tonnage sizing applications
where both efficiency and capacity are important.
Banana screens typically have a variable slope of around 24°-45° at the feed end of the screen, reducing to around 0°-8° at the discharge end of the screen. Banana screens are

usually designed with a linear motion/stroke vibrator.

Stage 1: High velocity
The feed section (highly inclined) of a banana screen causes high velocity material flow
which serves to quickly remove fine material.
Stage 2: Medium velocity
Midway along a banana screen, the resultant thinner bed stratifies quickly. The remaining
fine material (below the cut point) is screened out more effectively than would be possible on
a slower thicker bed.
Stage 3: Low velocity discharge
The lower screen slope slows the material down. More efficient screening of near size material occurs here.
As shown in above figure, the steep sections of the screen cause the feed material to flow
rapidly at the feed end of the screen. The resulting thin bed of particles stratifies more
quickly and therefore has a faster screening rate for the very fine material than would be
possible on a slower moving thick bed. Towards the discharge end of the screen, the slope
decreases to slow down the remaining material, enabling more efficient screening of the

near-size material.

Above figure shows a typical bed depth profile on banana screens.
The various slopes may also incorporate deck media with different apertures to meet the
particular process requirements. The screens are commonly designed to fit modular rubber
or polyurethane deck panels. However, woven wire or punched plates may also be used,
depending on requirements.
The capacity of banana screens is significantly greater and is reported to be up to three or
four times that of conventional vibrating screens.

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