All paper and board machines are according to a similar basic process. There are four distinct sections: head box, wire section (wet end), press section, drier section.

Raw material fibres and chemicals (and 99 % of water) are pumped to the head box, which feeds the stock evenly onto the wire section. This is a woven synthetic fabric that can be 35 metres long and as wide as the machine. As the paper stock flows from the head box onto the wire, the water drains away through the mesh leaving tiny fibres as a mat on top of the mesh.

The paper machine can travel at speeds of up to 2000m/minute and by the time the paper stock has traveled half way down the wire, a high percentage of water has drained away. When the thin mat of  woven synthetic fabric has reached the end of the wire section, it has become a sheet of paper, although very moist and of little strength. It then passes to the press section.

This consists of many sets of heavy cylinders through which the moist paper passes. More moisture is squeezed out and drawn away by suction. Then the paper passes to the drier section. This consists of a large number of steam-heated drying cylinders which have a temperature of slightly over 100°c. Until the paper is completely dry Polyester dryer fabrics carry the web of paper round the cylinders. Part way down the bank of drying cylinders is the size press, where a solution of water and starch can be added in order to improve the surface for printing purposes. A coater can be used which is what happens when coated papers are produced instead of sizer.

At the end of the drying process, the paper is smoothed using an "ironing" method, which consists of hot polished iron rollers mounted in pairs, one above the other (calenders or soft calenders) of woven synthetic fabric. This also benefit to consolidate, polish and glaze the surface of the paper.

Bella 
Sales manger 
Hebei Defeng Polyester Fiber Co.,Ltd 
Add: Wugong town west, Raoyang county, Hengshui, Hebei, China 
Tel: 86-311-67699480 
Fax: 86-311-67699480 
Mail: bella@china-polyestermesh.com 
Website: www.china-polyestermesh.com 

Tags: woven synthetic fabric, dryer fabrics