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Screening

OptiScreen solutions deliver high screening efficiency and improved end-product quality and machine efficiency

Valmet’s OptiScreen screening family is built on our comprehensive screening experience of more than 3,000 references in low- and high-consistency applications and the company’s in-house screen basket technology.

Broke screening

Broke screeningPaper machine broke can pick up contaminants which damage equipment and reduce overall stock quality unless screened before it is returned to the headbox. Broke screening with Valmet’s OptiScreen Broke screens removes impurities and fiber bundles from stock, providing high screening capacity with minimal fiber loss.

The OptiScreen Broke screen utilizes a fine slotted screen basket for thick stock applications at consistencies between 3 and 4%. The basket provides a physical barrier to contaminants while allowing the stock to pass through it. The unique rotor design exerts a push and pull force on the basket surface to prevent blocking of the basket. The reject rate is low with high-consistency screening because of the highly efficient technology employed to keep the screen basket surface clean.

Key benefits

High screening efficiency and runnability

  • Efficient impurities and contaminents removal
  • Uniform consistency and flow through the screening area provides high screen capacity

Targeted quality

  • Compact design in relation to production volume
  • Can be installed in low building space

Savings in operational costs

  • Longer screen basket lifetime
  • Low fiber loss

 

Coarse screening

Course screeningValmet’s OptiScreen Coarse screens are designed for all coarse screening applications in recycled fiber processing and stock preparation. Coarse screens remove heavy, light and coarse particles and contaminants from pulp, protecting subsequent process equipment from potential damage.

Vertical coarse screens are designed for up to 4% consistency, utilizing rotating basket technology with continuous reject removal. The rotating basket minimizes wear because the centrifugal force involved reduces contact between harmful particles and the screen basket. Valmet’s coarse screens’ optimal operating principle also yields low energy consumption.

Key benefits

Excellent screening performance

  • Effective removal of plastic, glass, metal debris, gravel and sticky particles
  • Gentle screening without breaking down impurities
  • Low fiber loss with controllable reject rate

Savings throughout the lifecycle

  • Low operating and maintenance costs
  • Low energy consumption due to compact screen units with inward flow and rotating baskets
  • Long basket lifetime

Lower screening system investment cost

  • Compact machine size
  • Simple screening system
  • High-capacity units

 

Fine screening

Fine screeningValmet’s OptiScreen Fine screens are designed for all fine-screening applications in mechanical pulping, recycled fiber processing, stock preparation and broke handling. Fine screens ensure targeted pulp quality and high screening capacity.

Valmet’s fine screens deliver high screening efficiency and excellent pulp quality. The correct combination of rotor and optimal screen basket ensures uniform consistency and pulp flow through the screening area in a consistency range of 0.5 - 4.5%. The wide series of fine screens, with seven unit sizes, ensures the optimal screen choice for every installation.

Key benefits
  • High screening efficiency and runnability
  • Controlled screening capacity
  • Targeted pulp quality
  • Savings in operational costs
  • Flexibility to modify the process