The machine has a wet end and a dry end. At the wet end, the stock is diluted to 200 parts water and 1 part fiber. The diluted pulp, looking a little like milk, is pumped through a horizontal slit, from where it lands on a fast moving polyester mesh called the wire. The wire can travel at speeds of up to 2000m/minute. By the time it reaches the end of this section the fibers have become a sheet of paper, through very moist and having little strength. It then passes to the press section. This consists of a number of sets of heavy rollers through which the moist paper is conveyed. Even if the paper web is still weak and moist at this stage.

It then passes to the dry end which consists of a large number of steam heated drying cylinders, up to 100 or more on large paper machines. Part of the way down the bank of drying cylinders is the size press. Here, the water and starch solution can be added to the table, to further improve the surface. Beyond the drying cylinders comes the calendar, which consists of a stack of polished iron rollers mounted one on top of the other. Paper making fabric’s function is to polish or glaze the surface of the paper as it passes between the rollers.Still travelling at up to 2000m/minute, the paper now comes off the machine ready for kindling into large reels, each of which may contain up to 20 tonnes of paper. These reels are later either cut into sheets or slit into smaller reels according to the type of paper and the customer’s requirements. 

A separate process is the coating of the paper with china clay and then polishing it through the calendar. This makes art paper, the glossy kind used for pictures. There are 3 main kinds of modern coating processes: blade coating, air knife coating and roll coating. Blade coating is normally done off the paper machine, as is air knife coating. But roll coating is done on the paper machine and can either be a complete coating or a first coat followed by off-machine coating by the blade or air knife process.

 

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: polyester mesh, paper making fabric