• Maco Corporation (India) Private Limited

Rotating Unions For Paper Industry Application

Maco offers long-life, trouble-free unions from Deublin that can accommodate a broad range of temperatures, pressures, viscosities and speeds. The seals have a surface finish of 4 RMS and are microlapped to an optical flatness of better than 2 light bands or 0.000023" for dependable leak-proof operation. A complete range of rotating unions is available for use in the paper industry. The combination of stationary siphon and balanced sealing is found to be the answer for high speed open-gear paper machines. In the paper industry rotating joints are used for the supply of saturated steam in dryers to remove moisture from the paper web and hot oil heating of nip rolls that remove wrinkles from the paper. In the former case the steam condenses to water and the condensate has to be removed from time to time to improve dryer efficiency. For this a variety of siphon systems is available, stationary as well as rotating type. The deltasint stationary siphon hydroplanes with the condensate preventing contact with the dryer shell prevents siphon failure. The advantages are: reduction of differential pressure requirement, reduction of blow through steam and elimination of dryer flooding. Balanced mechanical seal instead of the conventional pressure type extends the life of the sealing mechanism due to significantly reduced surface friction and wear. This also permits the use of the joint with superheated steam. The rotary joint and the siphon combination is rigidly supported by the machine frame, hence does not require any internal support or bushing inside the dryer to support the siphon, thus eliminating the need for routine siphon inspections.