The chip pretreatment stage is a key process in all mechanical pulping processes and serves to create the best pre-conditions for uniform and desired fiber separation in the subsequent refining stage.
The preferred chip pretreatment solution depends on the type and quality of the incoming raw material as well as the target characteristics of the final end product. For chemi-mechanical pulps, uniform and efficient chemical impregnation is the most important pre-condition in order to achieve high-quality pulp at low operating costs.
Valmet´s PREX-impregnation system is today the most renowned and appreciated system on the market, offering the best solution in terms of pulp quality, flexibility, availability and cost per ton.
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