Optimum shape design for disc refiners

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Valmet offers over 140 Variable groove features with Optimum shape design for disc refiners in applications for kraft pulp, mechanical pulp and recycled fiber low consistency refining. Results indicate 10-20% energy savings with same or improved refining results.

For our customers, this development guarantees high quality segments to cover a wide range of refiners, improved end product quality and lower operational costs. Valmet works in close co-operation with our customers to tailor-made segments that match their needs.

Customer results: 10 – 20% higher compression strength for Birch NSSC

Stage: 1st stage LC-refining


Remove shives and increase strength properties at lower energy cost


The customer is looking to save energy without loosing refining results


Traditional segments were relaced with Variable grooves feature - Optimum shape design


Trial was run in parallel refiners

  • Lower CSF or lower energy consumption (SEC) and less difference between gaps with new design 25-30%
  • reduced shive content with new design 10-20"
  • higher compression strength with new design
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Patented performance features

Variable grooves

Forces pulp into disc gap

Micro bar

Enables significantly denser designs

Maximum flow

Pumping inlet bars - improved feed

Attack bar

For increased fiber cutting