How Do I Properly Size a Vibratory Screener for Peak Throughput?
Direct Answer
Sizing is determined by calculating the Screening Area required to process your peak flow rate (lbs/hr) while maintaining an optimal Bed Depth. If a screener is undersized, the material bed becomes too deep (over 1.5 inches), preventing stratification and causing fine product to be lost in the discharge.
The Physics of Flow: Why "Bed Depth" Matters
The #1 mistake in industrial screening is Overfeeding. For a vibratory screener to work, the material must dance across the screen surface, allowing fine particles to find the mesh openings.
If you dump 5,000 lbs/hr onto a 24" screen, the material piles up. The fine dust rides on top of the large particles and discharges out the "Overs" spout, resulting in lost product and poor separation efficiency.
Tensile Bolting Cloth (TBC) vs. Mill Grade Mesh
Your mesh choice dictates your throughput:
- Tensile Bolting Cloth (TBC): Uses a significantly thinner wire diameter. This creates a much larger Percentage of Open Area, allowing for faster sifting and higher capacity. Use this for fine powders.
- Mill Grade: Uses a thick, heavy wire. This reduces open area but drastically increases durability. Use this for heavy scalping or abrasive aggregates.
When should I use backing mesh?
We recommend a backing mesh (typically 18 Mesh TBC) for any application using 100 Mesh or finer. The backing mesh acts as a support grid, absorbing the impact of the material load and cleaning balls, preventing the delicate fine wire from sagging or tearing.
