Woven Dryer Fabric Seam Types and Selection

The Seam Type of Woven Dryer Fabric

The difference in strength between the seam and the mesh makes the seam the weakest link in the operation of the dryer fabric and the most direct factor affecting the quality of the paper web. The seams of the endless dryer fabric is the same as the mesh body, leaving no imprint on the paper, but it is difficult to install on paper machines, and now only some small paper machines that produce special paper are used. Pin ring seam is a commonly used method for new double warp flat yarn dryer fabric, which is determined by the single filament of the mesh body itself. Sun Hong 1.5 layer flat yarn dryer fabric adopts spiral ring seams.

The use of hydrolysis resistant monofilaments and reinforced PPS monofilaments in the mesh requires better performance spiral ring matching. PEEK (Polyether ether ketone) can maintain high strength at high temperatures, has good dimensional stability, excellent chemical resistance, and corrosion resistance similar to nickel steel. It is currently an ideal material for producing spiral rings. The perfect combination of PEEK spiral ring seam, hydrolysis resistant polyester monofilament, and reinforced edge PPS creates the superior quality of the dryer fabric.

Choose Method of Woven Dryer Fabric

At present, one or several sets of dryer cylinders in front of the dryer section of high-speed paper machines, as well as one set of dryer cylinders after size press, generally use single web drying. In the single hanging dryer cylinder structure, the paper web can always contact the dryer fabric, so that the paper web with high moisture content is supported by the dryer fabric, eliminating shaking during operation, reducing the number of paper web breaks, and improving the production efficiency of the paper machine.

Single hanging dryer fabric should choose new types of mesh with good flatness, fine texture, low air permeability, and small differences in seams and mesh body. The air permeability of a single hanging dryer fabric is too low, which can easily lead to uneven moisture distribution in the paper web. If the air permeability is too high, the large amount of humid and hot air evaporated can easily cause the paper web to shake. Impurities in wet paper can easily stick to the mesh, so it is recommended to use a new type of dryer fabric with strong anti pollution ability during the single hanging drying stage.

The middle section of the dryer section is the main stage for the evaporation of moisture in the paper web, with the highest temperature. Therefore, dryer fabric with high air permeability should be selected to improve drying efficiency. Due to dampness. The hot air is discharged from the upper part of the hood, and the upper dryer fabric stays at high temperature and high humidity for a longer period of time than the lower dryer fabric, so there should be a difference in the choice of upper and lower mesh.

From the perspective of dryer fabric varieties, the most ideal selection should be a single-layer or 1.5 layer flat yarn dryer fabric for the front dryer cylinder, and a double warp flat yarn dryer fabric for the middle and rear dryer cylinders. With the increasing variety and subdivision of new dryer mesh varieties, this differentiated and targeted selection of mesh will become more and more widely used.