The 2.5 layer forming fabric of a paper machine is the continuous belt or belts of mesh screen upon which the paper sheet is formed. Most modern 2.5 layer forming fabric are comprised of polyester monofilament. The weave pattern and layering of a 2.5 layer forming fabric is designed to meet stringent requirements of dimensional stability, resistance to abrasion (on the wire side), minimum resistance to drainage, minimum wire-mark, and (sometimes) maximization of retention of fiber fines.
Polyester 2.5 layer forming fabric are also known as support shute double layer forming fabric or double layer extra designs. It's a standard double layer design with an extra shute yarn added on the forming side between the 2 regular cross direction yarns. This yarn increase the pulp fibre support and meanwhile create a more open structure as the amount of wear side yarns is reduced, compared with the forming side.
2.5 layer forming fabric's weaving effect greatly increases the fiber support index due to the addition of a fine weave at the top. The ratio of the top and bottom wefts is 2:1. It suitable for paperboard,newsprint,writing paper,tissue paper,printing paper,kraft paper.
The benefits include: High Open Areas for Fast Dewatering Performance, Cleaner Headbox Operation, reduce wear on dewatering element and Improved Sheet Formation, Better Mechanical Retention Leading to Higher FSI, High Wear Volumes Ensuring Excellent Fabric Life, Outstanding Fabric Stability, Good Guiding Stability on Demanding Applications.
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HUATAO GROUP
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