Defeng's forming fabrics are available in a wide variety of meshes, depending on the type of paper produced. Coarse mesh fabrics are used to manufacture heavy paper grades such as those used in the production of corrugated boxes. Very fine mesh fabrics are required for lightweight paper, such as writing paper, book paper and magazine paper. The average life span of a forming fabric, depending on the type of paper, is approximately three months.

To start the papermaking process, pulp is diluted and mixed to form a slurry of one part solids to approximately 200 parts water and pumped to the headbox. The mixture is pumped evenly through the slice — which is a narrow slot in the bottom of the headbox — onto the forming fabric. The fabric filters the water and retains the wood fibers to “form” the sheet. This is a critical part of the process because it affects the sheet’s final properties.

This forming section consists of a long moving belt of fine mesh screen supported by rolls or foils. For many decades, this screen belt was made of bronze and called the “wire.” Today it is made of synthetic polymer — primarily polyester monofilament — and is called the forming fabric. Newer machines (gap formers) trap the slurry out of the slice between two forming fabrics. As the forming fabric moves along the forming section, water drainage is assisted by foils. The fiber then passes over the suction boxes to pull more water from the furnish. Still more water is removed at the couch roll just before the sheet leaves the forming section. At this point, the sheet consistency is about 20%.

Anna
Sales Department
Hebei Defeng Polyester Fiber Co., Ltd
Add: Jingjiu Railway west, wugong town, Raoyang County
TEL: 86-311-67699480
FAX: 86-311-67699480
Website: www.china-polyestermesh.com. 
E-mail:anna@china-polyestermesh.com

Tag: forming fabrics, mesh fabrics