Advanced Web Cleaning System

DOX Web Cleaning Description
The aero surface cleaning system consists of a vacuum head with a conical suction pipe and a dust extraction unit. The cleaning unit is designed for large capacity vacuum. The cleaning effect operates evenly and continuously across the full width of the web.

During operation, the web enters the vacuum chamber for absorbing all dust particles. An air doctor (blade) and an antistatic high voltage bar are installed in this section. By passing through the ionization field as developed by the antistatic bar, the web is deionized. The air doctor can be infinitely adjusted to various angels towards the web to ensure that all dirt and fine particles will be loosened and absorbed.

Through the combination of deionization, doctoring with air and an extensive vacuum, all dust particles will be removed. The antistatic bar ensures that after the web leaves the unit it will not attract new dust particles.

Air supply to the air blade is provided by an air pressure system which must be adjustable to accommodate the degree of surface contamination of the web (average air pressure = 0,4 - 0,8 bar). The level of vacuum can be adjusted by means of a regulation flap in the vacuum pipe. It is not possible to specify the required vacuum level in this description since this depends on the degree of surface contamination and the desired quality of the finished sheet. Therefore, the vacuum level must be adjusted due to grade and process variables.

Benefits to the Paper Industry

• neutralizing the web from statically electricity by antistatic units and therefore loosening of the dust binding
  
• aerodynamic dust removal
  
• dust reduction of 90 - 95 %
  
• no change in surface or moisture content
  
• dustfree and ionized compressed air for the jet rake
  
• dust extraction unit with special filters for recirculation the clean air into the working room
  
• on-line installations into paper making and converting systems, printing systems and for corrugated board converting