Choosing the right screen media for a given application is the key to providing screen size adjustment accuracy and maximum throughput, which will also affect the performance of upstream and downstream devices. In the most basic definition, the sieving medium is a surface with openings on the vibrating screen. The sieve holes allow particles that are too small to pass, while particles that are too large can pass.
Each application is a unique screening challenge, so the type of screen media chosen is critical to success. Here are some different types of screen media and their advantages over applications:
Woven wire cloth is the most commonly used and widely used screening medium and can be used for operations such as peeling, sizing and dewatering. It is most suitable for medium and fine screens and is usually made of carbon steel or stainless steel. Although the most common is a square opening, the braided steel wire cloth can also be designed with a slotted opening to increase the capacity and increase the opening area.
Perforated plates are ideal for secondary screening and provide various types and hardness of steel, which are most suitable for medium and coarse screening. These plates are round, square, hexagonal and rhombus shapes due to their smooth surface and integrated structure. The flat plate is installed flat and fixed in place with bolts, or installed with quick clamps to speed up the replacement.
Polyurethane is a synthetic polymer that can be cast or injection molded into screens or panels/modules. This material is most suitable for medium-coarse screening, with square or rectangular screens (slotted). Due to its excellent wear resistance and resilience, the life expectancy of polyurethane in wet applications far exceeds that of woven wire cloth.
The profile (wire) deck made of stainless steel is mainly used for dewatering applications. This type of cover plate is composed of V-shaped or triangular wires, which are supported in parallel on cross bars. There are many shapes to choose from. Its main advantage is the above-average wear resistance, and the opening is enlarged as the material flows to reduce clogging.
Ash rods are used for heavy screening applications, such as the removal of fines from chips and turning in machining centers. The simplest and most economical method is to support the round rod on a certain distance lateral support. The advantages are excellent wear resistance, a strong structure to handle larger materials and a structure that reduces plug holes.