Screening

At KCL a wide range of mill process simulations are available. This can be achieved through the several wedge wire screen baskets with different slot widths and profiles, hole screen basket, several rotors, three pressure screens with flexible flow connections, and full control automation.

Raw materials can be delivered in bales or with tank car. High consistency raw material can be slushed and hot disintegrated in the pulper. Desired screening parameters can be achieved by conducting test runs and analyzing samples in KCL laboratory or in KCL's subcontractor laboratory located on the same premises.

Advantages of screening trials

The results of screening trials can be easily transferred to mill conditions, because KCL's screening station provides realistic simulation mill process condition for screening tests. Pulps can be fractionated in several different ways that result in indentifying the optimized reject ratios.

These possibilities together offer a change to:

  • Find solutions for improving pulp quality
  • Decreasing reject amounts
  • Finding optimum raw material ratios
  • Upscale the most suitable process models
  • Fractionate desired material for further processing

Screens are connected to a data collecting system and the most important parameters are reported. Taking samples has been simplified and samples can be taken from all the main flows of the screening process.

Successful trials can lead to an environmental, economical and qualitative improvement.

Further processing

Reject pulps can be refined again with HC or LC refiners and screened again. Fractionated pulp consistency can be thickened with a disc filter. For paper machine trials different types of pulps can be prepared by chancing screening conditions. For example, the effects of changing screening conditions for wet web strength can be analyzed with the KCLWWS-device in the paper machine.

Technical information

 

CONTACT

Ville Henttonen

+358 40 5416502
firstname.lastname@kcl.fi

 

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