ANDRITZ chip pretreatment

RT pretreatment and chemical impregnation is a key process stage in mechanical pulping.

Mechanical chip pretreatment prior to refining reduces specific energy demand and improves fiber quality in mechanical pulping. ANDRITZ chip pretreatment systems, such as the MSD Impressafiner chip compression device, are excellent for both hardwoods and softwoods.

The PrimeMSD Impressafiner in Action: This animation demonstrates the innovative features of the PrimeMSD Impressafiner, showcasing how its unique design delivers exceptional performance in chip pre-treatment.

Key Features and Benefits

Enhanced Impregnation Efficiency: The PrimeMSD enables chips to absorb up to twice as much impregnation liquor compared to plug screw feeders, resulting in better chemical penetration and improved pulp quality.
Significant Energy Savings: By optimizing chip preparation, the PrimeMSD reduces specific energy consumption in high-consistency refining of up to 140 kWh/adt—a 25% decrease.
Comprehensive Chip Treatment: The system effectively removes moisture, extractives, and shives, while achieving maceration, partial delamination, and homogenization of wood chips.

This advanced pre-treatment technology is suitable for a wide range of raw materials, offering unmatched adaptability and performance in mechanical pulping lines.

The future of mechanical pulping begins with the PrimeMSD Impressafiner

The PrimeMSD Impressafiner goes beyond conventional chip compression systems, delivering advanced solutions for key challenges in mechanical pulping:

Improved Process Efficiency: Superior impregnation and optimized chip maceration lead to reduced energy consumption and smoother refining.
Enhanced Product Quality: Better prepared chips result in improved fiber strength, lower refining challenges, and consistent pulp quality.
Sustainability at its core: Lower energy use and reduced waste generation align with modern environmental and operational goals.
Proven Performance: Backed by global installations and extensive field data, the PrimeMSD is a trusted solution for mills seeking to enhance their mechanical pulping operations.

With its robust design, advanced capabilities, and proven results, the PrimeMSD Impressafiner sets the standard for chip pre-treatment technology.

Wood chip maceration: Superior chip preparation and delamination with the PrimeMSD Impressafiner

Mechanical chip pretreatment for softwood applications

In the modular ATMP process, the first stage (RT pre-treatment) is performed in a slightly pressurized Impressafiner at elevated temperatures to delaminate the wood chips prior to the low-intensity refining stage (RT Fibration).

Impregnation – the heart of hardwood chemi-mechanical pulping

Uniform and efficient impregnation of the wood chips with chemicals is the most important pre-condition for the production of hardwood chemi-mechanical pulps. In the ANDRITZ P-RC APMP process, the chip structure is opened up by mechanical pretreatment of the chips in the MSD Impressafiner prior to chemical application. This enhances the high uptake of chemical liquor and uniform penetration within the chips.