Fractionator

Application

Fractionators are devices designed to separate fiber into various fractions that differ in linear dimensions. The waste paper mass, especially when processing mixed waste paper, contains a large amount of small and destroyed fibers, the presence of which leads to an increase in fiber washing, slows down the dehydration of the mass and worsens the strength indicators of the finished product. In order to bring these indicators to some extent closer to those, as in the case of using original fibrous materials that were not in use, the waste paper mass has to be additionally ground to restore its paper-forming properties. However, in the process of grinding, further grinding of the fiber and the accumulation of even smaller fractions of it inevitably occur, which further reduces the ability of the mass to dehydrate, and in addition, leads to a completely useless additional consumption of a significant amount of energy for grinding. Therefore, the most reactionary scheme for the preparation of waste paper pulp is when, in the process of its sorting, fiber fractionation is carried out, and either only the long-fiber fraction is subjected to further grinding, or their separate grinding is carried out, but according to different regimes, optimal for each fraction.

Essential features.

 The installation has a vertical cylindrical body, inside the upper part of which there is a sorting element in the form of a horizontally arranged disk, and below it, in the lower part of the body, there are concentric chambers for the selection of different fiber fractions. Sorting fibrous suspension under excess pressure 0,15 -0,30 MPa through the nozzle nozzle with a speed of up to 25 m/s is directed perpendicularly to the surface of the sorting element and, hitting it, due to the energy of the hydraulic shock, it is broken into individual smallest particles, which in the form of sprays scatter radially in the direction from the center of impact and depending on the size suspension particles fall into the corresponding concentric chambers. Rotor of special design. Such a design of the rotor creates a high-frequency pulsation with a lower positive impulse and a higher negative impulse in the mass sorting zone, which excludes mechanical grinding of extraneous inclusions and ensures self-cleaning of the sorting sieve during the sorting process. The rotor is compensated and dynamically balanced.

 Advantages:

• Improved separation of contaminated and high sorting efficiency;
• Low power consumption;
• Improvement of paper quality;
• Basket with slits  manufactured on the latest CNC machine.

Model	Productivity, tons/day	Power, kWt)	Drive, rev/min
4	30-50	22	1470
5	90-100	37-45	1470
6	100-150	44-55	1470
8	150-200	55-75	1470
10-08	250-300	75-90	980
10	280-350	110-125	980
12	350-450	132-150	980