Stock preparation line
Final product: fluting, corrugating medium, kraftliner, testliner, white top linerReference SPL output: 200 - 1,300 tpdRaw material: waste paper sorts OCC, MW
Stock preparation line consists of:
- White water treatment, fiber recovery
- Vertical pulper, screenplate boring ø 12 mm
The total specific energy consumption (SEC) in the node is 35 to 45 kWh/t.
Coarse screening node
- 2- to 4-stage screening, screen boring ø 2.2 mm
Approx. 15 % impurities are separated in the coarse screening node to be pressed together with reject coming from the pulping node. Very low SEC is obtained thanks to high throughput capacities of the STU-type pressure screens. Total SEC of the node is 30 to 40 kWh/t. Fibre content in the reject is 10 to 15 %.
Fine screening node with fractionation
Approx. 5% impurities are separated in the fine screening node. Rejects are dewatered in a belt press to a dryness of up to 20 to 25 %. Total SEC of the node is 40 to 50 kWh/t. Fibre content in the reject is 70 to 75 %.
Approach flow part systems for top and bottom wires
- Fine screening (0.35 mm slots)
- Direct mixing white water (WW)1 - ERMAMIX SILO
Total SEC of the node is 35 to 45 kWh/t.
UTM broke pulpers