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Perforated Plate|Rubber Screening Systems|Screening Accessories

Perforated Plate

Abrasion-resistant perforated plate is often the best choice in unique and severe screening situations. Hoyt's abrasion and impact-resistant screening plate is custom made to suit the specified screening application and screening equipment where these extreme screening situations occur. Impact and highly abrasive raw material are the primary reasons why perforated plate is a logical choice. Unlike woven wire cloth, perforated plate has a level screening surface, free from high points, which rapidly wear away in many severe screening applications. The sliding material, oversized, near-sized, and undersized, "sees" a uniform screening surface and "freely flows" down the length of the screen deck, effectively separating the oversized material from the undersized particles.

Choosing the Right Plate Material for Your Application

Choosing the type of aperture (hole) best suited for your screening application is only one part of perforated plate selection. The type of material used also has a tremendous impact on cost-effective screening. Hoyt can provide four different types of plate material. Your Hoyt sales representative will recommend the correct one for your application and budget.

What is the meaning of Brinell?

In general, the wear resistance of plate is related to the hardness. There are several different methods used to measure plate hardness. One of those is the Brinell test. You may see Brinell abbreviated as "HB" or "Bhn." Basically, a 10mm carbide ball is mechanically forced into the surface of the plate at a predetermined force level. The resulting indentation is measured and given a value. That value is the Brinell hardness number. The higher the number, the more wear resistant the plate will be.

162 Brinell Plate

This is an "as rolled" (not heat treated) plate material that has a hardness of 162 on the Brinell hardness scale. It has a hardness of 85 on the Rockwell "B" scale and, therefore, is sometimes known as 85b plate. This material has a low initial cost and is best suited for the screening of relatively non-abrasive materials such as limestone.

235 Brinell Plate

A relative newcomer to perforated plate materials, 235 Brinell material is also "as rolled." A somewhat "beefier" chemistry and different mill rolling techniques give this material greater abrasion resistance than standard 162 Brinell materials. Somewhat more costly, it can be effective when used in more abrasive applications such as high-silica sandstone and lower-abrasion granite.

280 Brinell Plate

This quench and tempered (heat treated) material has been an industry "workhorse" for many years. While the heat-treating process adds more expense to the product, it also allows the plate to last a long time in very abrasive environments such as crushed granite and granite-based sand and gravel. For the ultimate in cost-effective perforated plate screening in any material, however, Hoyt recommends JADCO QT-PLUS™ (see below).

JADCO QT-PLUS™

Hoyt Wire Cloth is an authorized distributor for JADCO QT-PLUS™ perforated plates. QT-PLUS is the ideal choice for extreme abrasion and/or impact. In addition to outstanding abrasion resistance, JADCO's proprietary chemistry offers excellent weldability and amazing ductility. The Brinell hardness of QT-PLUS™ is 461 to 537 in thicknesses up to 1". It is not uncommon for QT-PLUS™ to outwear 162 Brinell plate by a factor of 10:1 and standard AR400 by 2:1. QT-PLUS™ is also available in custom-cut chute liners, feed box liners, discharge lip liners, crusher feed liners and cutting edges. Your Hoyt sales representative can take the proper measurements and provide cut-to-fit custom-wear items fabricated from QT-PLUS™.