» Paper / Board mach.. » Stock preparation » Thick stock treatm..

High and medium consistency screening

Broke screening, thick stock screening, and protection screening before refining

Maximum cleanliness with minimum costs

Small debris in the approach system can cause quality problems, like coating streaks or other visual defects, and production problems such as web breaks. Thick stock screening removes impurities before they can enter the paper machine approach system. With high-consistency screening, all the stock components entering the machine chest are screened with narrow slots of 0.15-0.25 mm.

Thick stock screening and broke screening benefits

  • Screening with narrow slots at high consistencies reduces system and pumping volumes
  • Removing the debris and impurities with thick stock screening leads to considerable cost savings in headbox screening basket replacements
  • Narrow slots give the highest screening efficiency
  • Flexible basket/rotor combinations allow adaptations for different raw materials and applications
  • Optimized rotor dilution options and intermittent rejecting in the tailing screen allows the highest yield and lowest losses of good fibers

Using a protection screen instead of high-density cleaners

  • Screen cylinders with 4-5 mm holes stop bale wires, stones, and coarse debris from destroying refiner plates
  • High-consistency screening (up to 5%) creates optimum process conditions for LC refining
  • Intermittent reject removal leads to high yield and minimum loss of good fibers

ANDRITZ stock preparation screens

ModuScreen CP: protection screen before refining giving best separation efficiency in high consistencies

ModuScreen C&F: combined coarse and fine screening delivers highest screening efficiency with lowest wear

ModuScreen A and ModuScreen F: highest availability and flexibility for all thick stock and broke screening applications

Products & services - details - ANDRITZ GROUP - servertoken