Mineral & Aggregate Processing

Johnson Screens stocks a wide range of woven wire screen cloths suitable for the quarry.

A screen cloth is a generic term for the most versatile and common of all screening mediums within the quarry industry. Subject to individual applications, woven wire screens are supplied in standard aperture sizes from 0.002 in. / 0.06 mm to 4.92 in. / 125 mm with various wire sizes and weaving patterns.

The original Milliscreen, a self-cleaning, internally fed rotary fine screen was developed by Contra-Shear – now a Johnson Screens^® company.

Polyurethane is recognized as one of the best materials from which to manufacture screening surfaces. The use of polyurethane tensionable mats as a screening surface has many advantages provided the application is appraised correctly. Polyurethane tension mats have a long life with screening materials such as quartz, silicon and sand. This is because of polyurethane’s resistance to abrasion and immunity to the effects of most corrosive materials.

The importance of applying correct spraying techniques is often the most under-rated function in the screening process. Johnson Screens is very much aware of its importance and has therefore designed a range of spray nozzles renowned for their versatility. Our wide range of quick interchangeable nozzles allows the user to maintain the spraying function effortlessly.

The Suboscreen is a self-cleaning, in-channel, semi-submerged rotary fine screen.  The Suboscreen is capable of handling high flow rates and is suitable for both municipal and industrial applications. The influent entering the Suboscreen changes direction through 90 degrees as it exits the screen resulting in a high capture of solids.

Johnson Screens® centrifugal screen baskets are the strongest and most robust in the mineral processing industry. The baskets are built to exacting specifications and quality standards. There are models to suit most centrifugal dryers. Screen wires are welded to support rods at every junction to ensure strong, rigid construction.

Tiro^®, “Tap In, Rip Out” Vibe screen is an extension of the Poly-Vibe^® in which smaller panels are actually snapped onto the support frame of the screen. The advantages of such a screen are:

• Only worn panels need be replaced
• Screen panels are much smaller than a full-hooked screen panel
• Screen panels are lighter and safer for the maintenance team

Replacement is carried out with a lever and a mallet. Wires are rectangular rather than round and therefore have improved wear results and higher open area.

Ceramic wear liners can be suitable for many different applications. The tile size, shape and layout will be determined by the customers’ protection requirements. When assessing which configuration will provide the required protection level, we consider lump sizes, drop heights and working angles.