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Mechanical refining

Dr. Arne Asplund (1903–1993) invented the Defibrator pulping refiner and the defibrator-method (also called the Asplund-method) for pulping wood chips in the 1930s.

The longest historyDr. Arne Asplund

Asplund was awarded the Gold Medal of the Royal Swedish Academy of Engineering Sciences (IVA) in 1947 for the invention and his further development of the defibrator-method for pulping wood and other fiber rich materials. He was later awarded the Great Gold Medal from IVA in 1969 for his work with defibration technology.

High consistency refiners

  • Conical disc RGP
  • Double disc RGP
  • Flat disc RGP

Low consistency refiner

  • OptiFiner

Groundwood Grinders

  • PGW

Fiberboard Defibrator

  • Evolution Defibrator (EVO)


Spare parts and components For refiners

Refiner Exchange Service

A completely reconditioned drop-in unit, upgraded to the latest design.

Shaft assembly

An overhauled and modified shaft assembly is available for all sizes of Conflo/OptiFiner RF refiners.

Exchange system for SD refiners

Available to rapidly provide you a completely reconditioned, guaranteed drop-in unit.

Transroll Screw Exchange System

Reconditioned transroll screws upgraded to the latest design

Refiner Alignment Block

Adjustment blocks for quick and accurate alignment of a Classic Refiner bearing unit.

Mechanical seal – SealMax BA-LC

Valmet mechanical seal type BA-LC for OptiFiner Low consistency refiner.

Infeed Screw FSA

Upgrade package for double-disc refiner infeed screws.


Process and automation upgrades For HC refining

Adjustable Gap Sensor (AGS)

Disc gap calibration during full production.

Disc Gap Control Agreement

Agreement that combines accurate disc-gap control with energy-saving segments.

Disc Gap Control

Safely control the refiner/ Defibrator from a remote control room.

Refiner Adjustment Device

This is an upgrade device that is more reliable and demands less maintenance.

CMS – Upgrade kit to electric stepping motor

Optimize your energy consumption and fiber quality.


Maintenance and shutdown managment for HC refining

Refiner Hydraulic Unit

A complete unit that fits on existing refiners without any modifications.

RLP Oil Unit 

A freestanding, external panel to facilitate servicing of the water and hydraulic panel.


Process and automation upgrades For LC refining

Adjustable Gap Sensor (AGS)

Disc gap calibration during full production.


Maintenance and shutdown managment for LC refining

StockBoost for refining

Tailor-made upgrades for existing refiners.

Turbine housing

Turbine Housing that replaces the existing radial outlet design with a tangential outlet.

Touch vibration detector

System to protect valuable components from clashing failures.

Closed mechanical seal

Valmet-developed seal allows the use of a mechanical seal for low-consistency refiners in difficult seal water conditions.



Grinder rebuild products

Stable production with grinder rebuilds