NSSC pulping

NSSC(Neutral Sulfite Semi Chemical) is the ideal process for producing pulp for fluting, which is the corrugating medium in containerboard. Valmet’s NSSC process gives pulp an optimal combination of strength and stiffness.

Hardwood chips are impregnated with sulfite and carbonate at weakly alkaline pH, cooked for about 30 minutes at 170-180 °C, defibrated to coarse pulp in a refiner, washed and finally refined to obtain an optimal combination of strength and stiffness. The total energy consumption in defibration and refining is normally less than 200 kWh/t. The spent liquor is normally sent to a recovery cycle of a kraft mill for recovery of chemicals and heat.

Chip washing

Producing quality pulp requires chips that are free from sand and other impurities. At Valmet, we provide optimal chip washing efficiency for our customers’ various processes.

Chip treatment

The chip pretreatment stage is a key process in all mechanical pulping processes. Valmet is the market leader, offering the best solutions in terms of pulp quality, flexibility, availability and cost per ton.

Refining

At Valmet, we offer refiners that can meet every customers’ unique needs. Our equipment include high consistency refiners and low consistency refiners.

Steam separation

Valmet’s technology for steam separation in mechanical pulp production provides significant environmental and energy benefits.

Washing

At Valmet, we offer washing solutions for all types of mechanical pulps. By choosing our solutions you invest in proven process know-how and long-term support.

Bleaching

In mechanical pulping, Valmet has extensive experience of peroxide bleaching processes for all pulps.

Screening and cleaning

Valmet provides you with a process that gives you a clean pulp free from shives, bark and foreign particles.

Our expertise is at your service

Our focus is to bring your performance forward. Get in touch with us through our website, or through your local Valmet office.