Polyester dryer fabric quality and design must also keep up with the innovative design of these machine. The polyester dryer fabrics are becoming a more crucial element in successful machine operation.

Drying is the last major process in paper making process. The sheet, which is formed in the forming section and consolidated and dewatered to a certain extent in the press section, enters the dryer section for the removal of remaining extra water in the structure. The consistency of pulp at the entrance to the forming section is approximately 99% water and 1% fiber. A significant amount of this water is removed in the forming and press sections. Typical sheet consistency after the press section is 40% fiber and 60% water (in shoe presses, the ratio is 50%/50%). The remaining extra water in the sheet has to be evaporated in the dryer section with polyester dryer fabric or polyester spiral dryer fabric. During the drying process, the loose network of fibers is consolidated into a more compact, continuous web structure. The moisture content of the sheet after drying is approximately 5%.

Although the effect is not very pronounced, the drier the sheet is coming to the press, if all other things remain constant, the drier the sheet will be going to the dryers. A dry, well compacted sheet from the forming and pressing sections will help the dryer section to run more efficiently, resulting in better machine operation. Dryer cleanliness and fewer sheet breaks are advantages but the big effect comes from better heat transfer and easier drying. Better dryer contact from a smooth, well formed sheet will result in easier drying. The drier the sheet is coming to the dryers, the less steam will be required to dry the sheet. Drying is a costly process. Therefore, every effort should be made to remove as much water as possible from the sheet prior to drying section with polyester dryer fabric of the paper machine. A 1% increase in sheet dryness to the dryers will result in about a 4% increase in dryer efficiency.

Significant improvements in sheet runability in the dryer section have been accomplished in the last fifteen years. These systems have not only increased the efficiency of existing machine, they have made possible ever increasing machine speeds and sheet quality improvements.

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 dryer fabric, polyester spiral dryer fabric