Pick Count

The weft count is a key term in weaving technology and refers to the number of weft threads (cross threads) within a weave repeat or per defined length unit. In weaving theory, the repeat size is given as the ratio of warp to weft threads; the first number represents the required warp threads, the second the weft count. For example, in a repeat of 12:8, the weave pattern repeats after twelve warp threads and eight weft threads. A higher weft count means that more cross threads are inserted over the same length. This directly affects mesh size, pore structure, flexibility, and the mechanical strength of the fabric.
For woven filter media, the weft count is one of the key design parameters. Together with weft wire thickness and weave type, it defines the open area, flow rate, and particle retention. Densely woven plain weaves with a high weft count offer small pore sizes and are suitable for fine filtration or as support layers in multilayer filter elements. A reduced weft count creates larger openings and thus higher flow rates, which is useful for dewatering belts or press filters. Mechanical properties also depend on the weft count: high weft counts increase transverse stability and reduce thread slippage, resulting in a more robust belt.
By varying the weft count, we can tailor fabrics to specific applications. For process belts in the pulp and paper industry, a balanced weft count ensures high dewatering performance and uniform fiber alignment. In the food industry, belts with a high weft count and fine wire are used to retain the smallest particles while meeting hygiene requirements. For architectural fabrics, the weft count influences appearance: dense weaves look homogeneous and provide sun protection, while open structures create transparency and airflow.
In filtration technology, the weft count, together with the warp count (number of longitudinal threads), wire diameter, and material (stainless steel, bronze, plastic), plays an important role in calculating mesh count and pore size. With modern CAD-controlled weaving machines, the weft count can be precisely adjusted, enabling variable zones with different pore structures. Our engineers advise on selecting the optimal weft count and weave type to balance filtration performance, cleanability, and service life.
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