During sheet break or shutdown is the best time for oscillating high pressure water showering. Cleaning during shutdown should be at the highest speed possible to avoid streaking. Polyester dryer fabric should be completely dry before paper is produced again.

A 0.0039 inch (1 mm) nozzle for high pressure water showering is best for avoiding wet streaks. For optimum cleaning, the nozzle should be 8 to 12 inches (200-300 mm) from the polyester dryer fabric surface. Between 6 to 8 inches (150 – 200 mm), the water forms small droplets that hit the surface of the polyester dryer fabric. This hammering effect cleans better than the laminar flow at shorter distances.

A jet nozzle is recommended and a tray is usually necessary for collecting dirt and water on the opposite side of the polyester dryer fabric. You can expect improved cleaning results with higher water temperatures such as 140-185°F (80-85°C). Hot water, 176-185°F (80-85°C), can allow high pressure showering while producing paper and without streaking problems. You can minimize wet streaks by using hot water. With water temperatures of 176-185°F (80-85°C), subsequent air showering is sometimes unnecessary.

A high pressure water shower should be placed on the paper side of the polyester dryer fabric if possible. If the shower is placed on the back side of the polyester dryer fabric, much of the jet’s energy will be lost as it penetrates the fabric. The shower should be placed as early as possible in the return section of the machine.

              

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

Tag: polyester dryer fabric