Round wood consumption  3 700 000 s-m3/a, purhaced chips 1 000 000 s-m3/a, total wood consumption 4 700 000 s-m3/a. 2 debarking lines, Harwood and Softwood. Drum debarking, controlled by APC (Advanced Process Control) system. HW thickness screening and SW gyratory screening.

Solution Mapping found:

-Wood loss reduction potential in debarking, 1%-1,5%

-Wood loss reduction potential in Screening, 3,0%-3,5%

-Electrical energy saving potential approximately 8%

-30,000 EUR/a freshwater saving potential

Round wood consumption  2 100 000 s-m3/a, purhaced chips 900 000 s-m3/a, total wood consumption 3 000 000 s-m3/a. 2 debarking lines, Softwood (Pine/Spruce). Drum debarking, controlled by APC (Advanced Process Control) system. Thickness screening for chips screening..

Solution Mapping found:

-Wood loss reduction potential in debarking, 1,1%-1,4%

-Wood loss reduction potential in Screening, 0,5%-1,25%

-Debarking electrical energy saving potential 31%

-Freshwater usage not studied

Round wood consumption  2 400 000 s-m3/a, purhaced chips 800 000 s-m3/a, total wood consumption 3 200 000 s-m3/a. 2 debarking lines, Softwood (Pine/Spruce). Drum debarking. APC (Advanced Process Control) system not usable. Thickness screening for chips screening..

Solution Mapping found:

-Wood loss reduction potential in debarking, 2%-2,5%

Reduction of pin+fine in chips 1,5-2,5%

-Wood loss reduction potential in Screening, 0,5%

-Debarking electrical energy saving potential 23-35%

-30-50% reduction of freshwater usage.

Customer specified that the Solution Mapping was focused on chip quality improvement only.

Round wood consumption  3 400 000 s-m3/a, purhaced chips 750 000 s-m3/a, total wood consumption 4 150 000 s-m3/a. 3 debarking lines, Hardwood and Softwood. Drum debarking, No screening for chips.

Solution Mapping found:

- 6 main reasons for lower chip quality

- 2 secondary improvement for chip quality

Chip quality analysis was carried out at the mill with the high speed filming.

The effect of the changed chipper settings was studied with chip sampling and high-speed video.

-Hardwood Chipper: Reduction of oversize and overthick fractions by 26%. Reduction of the fine material by 31%.

-Softwood Chipper: Reduction of oversize and overthick fractions by 29%. Reduction of the fine material (pin+fines) by 43%.