Woodchips used for chemical pulp must be relatively uniform in size and free of bark. The optimum size varies with the wood species. It is important to avoid damage to the wood fibres as this is important for the pulp properties. For roundwood it is most common to use disk chippers. A typical size of the disk is 2.0–3.5 m in diameter, 10–25 cm in thickness and weight is up to 30 tons. The disk is fitted with 4 to 16 knives and driven with motors of ½ –2 MW. Drum chippers are normally used for wood residuals from saw mills or other wood industry.

Our wood chips are mainly imported from Brazil, Argentina and Chile in South America.