With Pegging or Blinding, the proper operation, speed, stroke, shaft rotation, and machine balance should be checked to ensure it is optimized for the application.
If machine operation has been verified, then a change to the screen surface should be considered. Each of these problems requires a specific screen surface solution.
Pegging
Screen Surface Material
Pegging can in many cases be eliminated by a change in the physical properties of the screen surface material. Switching to a softer, more flexible material can allow the normally pegged particles to escape (either pass or be rejected).
Screen Surface Thickness
Pegging can sometimes be a result of the thickness of the screen surface, specifically at the aperture webs (the lands between the openings). This can be corrected by designing a thinner screen surface that allows the particles to pass more rapidly. This is typically a balance between proper load support, service life, screening accuracy, and pegging resistance.
Aperture Shape: Many pegging issues can be solved by changing the shape of the aperture. Square openings are the most common for tightly controlled sizing operations, but square apertures may tend to peg as particles will wedge into the corners of the opening. Note: Pegging can also be a result of using punched rubber screen products. All Valley Rubber products are manufactured with molded apertures designed with tapered relief to resist pegging.
Blinding
Blinding is one of the toughest screening issues to solve and requires a combination of material properties, screen surface design (thickness, aperture, and reinforcing), and in many cases, requires the addition of anti-stick rubber compounds to the rubber material.
Fine materials adhere to the surface of the screen and clog the openings. This typically occurs with moisture sensitive material (like clay and ultra-fine materials).
We offer standard screening systems as well as custom designed screens to fit all makes of screening equipment, giving you a cost-effective solution. We can customize your screen by adding diverter bars, skid bars, extra structural support and impact areas- available in both rubber and rubber/ceramic configurations.
Contact us today to see how we can replace your current media on the existing frame, with no adjustments necessary.
