Pulp Washing
DNT
The DNT washer thickener is a high speed double nip thickening machine, using a synthetic wire for the most efficient removal of small ink particles, fillers and other contaminants smaller than 100 mm. The unit's design is simple, compact, and offers high capacity with thorough washing.
Working Principle
Pulp is injected between the first nip (formed by a grooved breast roll) and the wire, resulting in high stock feed capacity. The stock is deposited on the wire and dewatered around the breast roll, traveling to the couch roll were it is dewatered a second time to produce highly washed and thickened stock up to 15 % consistency.
Applications
- For all applications, one stage thickening of stock
- Ash removal for applications requiring a limited ash content
- Micronised and soluble (eg: flexographic) ink removal
- Separation of fillers and fine elements for a long fiber fraction in brown grade applications
Benefits
- High efficiency for ash removal and stock washing
- Excellent thickening ability with, on average, less than 1% at the inlet and over 10% at the outlet
- Simple roll pattern - easy wire change
- Good removal of micronised inks
- Extremely compact and easy installation
Alternative solutions for washing are the drum thickener and the dynamic washer.