Separation

Sandwich Screens

Sandwich Screens, also known as Self-Cleaning Screens are used to mitigate Screen Blinding, or clogging of the mesh, slowing down production.

Balls and sliders are sealed between a classifying mesh on the top and a coarser support screen mesh on the bottom secured together with a screen tension ring and epoxied together as a singular unit.

 

The unique combination of balls inside each slider yields better results than sliders or balls individually. The balls bounce off the carrier mesh and up into the classifying mesh, forcing the near-size particles to be cleared from the screen openings, and the sliders use a gentle shearing action, forcing particles away from the screen openings.

Standard Construction:

The following are for standard construction. Custom construction is always available.

  • Bottom carrier mesh – standard T-304 SS 8 Mill Grade x .025”, other mesh openings are available upon request
  • Screen Cleaning Devices – Sliders available in Nylon / Polypropylene / High Heat Polyester / Hytrel Polyester, 5/8” natural rubber balls.
  • Top screen – Stainless Steel T-316 SS classifying mesh for separating the product.
  • Sealing – FDA / CFIA Approved Epoxy grade
  • Large diameter screens requiring center support options are available, typically solid FDA / CFIA epoxy center spacers

Common Uses:

  • Effective for both wet and dry screening applications.
  • Operates most effectively on particle sizes less than 100#.

Advantages: 

  • Greatly extends the lifetime of each individual screen.
  • Lower maintenance costs – screen life and motor life are increased due to improved cleaning efficiency over other screen cleaning solutions.
  • Quieter action reduces noise level when compared to other screen cleaning solutions.
  • Smaller engineering fit allowing for greater clearance and shorter separation machine height, compared to other screen cleaning solutions. 
  • Single unit design allows for rapid screen changes.
  • Re-screening options allow for significant cost saving opportunities, typically all components, including the bottom carrier mesh can be used multiple times.