Waste paper is paper waste that is not of historical value, used as recyclable materials for the manufacture of paper and cardboard. Using waste paper saves primary raw materials. Large tracts of forest are preserved, which is ecologically very beneficial. Recycled paper and cardboard are environmentally friendly as they do not contain harmful substances.
Necessary
- - waste paper;
- - water;
- - pulper;
- - vibration sorting;
- - cyclone;
- - Entishtippers;
- - sorting;
- - vortex conical cleaners.
Instructions
Step 1
Recycle waste paper using "wet technology" in several stages. In the first step, break up the waste paper in a pulper. It consists in the following: paper and cardboard are crushed in an aqueous medium and separated into fibers through a built-in sieve with holes Ø 10-12 mm.
Step 2
At the next stage, clean the waste paper from light and heavy impurities. Light impurities include pieces of waste paper, polymer films, and heavy impurities - sand, paper clips, glass, etc. Get rid of the first type of impurities using vibration sorting. Here the waste mass passes through a sieve and is delivered for further regrouping. Remove heavy impurities in waste paper cleaners - cyclones. In the dirt collectors, heavy impurities go down and are periodically removed. All cleaning devices must be supplied with water to preserve the waste paper.
Step 3
After cleaning the waste paper from impurities, proceed to the pre-release stage. Carry out additional release on entishtippers - special equipment such as disc or conical mills, as well as on pressure sorting with slotted or round holes, centrifugal sorting. Entishtippers have a special grinding set with a clearance of 0.5-2 mm. Turbulent pulsations, as well as friction of waste paper, contribute to the separation of parts of waste paper and clumps of fibers into separate fibers. A cylindrical sieve is located in the centrifugal screen housing, in which the blade rotor is located. Waste unsorted mass, falling into the central part of the sorting, is directed by the rotor blades onto the inner surface of the sieve. The fibers passed through the sieve are further processed. Unfibered clumps of fibers with impurities are transported forward for removal through a branch pipe. Depending on the purpose and design of sorting, they operate at low, medium and high concentration of waste paper, which is 0, 2-1, 5%, 2-3% and 4-5%, respectively.
Step 4
Finally, move on to the final cleaning of the waste paper. Use vortex cone cleaners for this. The waste paper goes through three stages here. For effective cleaning, the optimum mass concentration is 0.5%.
