De-Inking for pulp & paper industry

De-Inking for pulp & paper industry

The purpose of de-inking is to remove the printing inks and other substances like stickies that might effect the paper making process or the nal properties of the paper. In a de-inking rocess the ink should be rst detached from the fiber. Flotation technology with high efciency provides high yield ofbers and simple handling with maximum operating reliability.

The Parason De-inking cell consists of number of cells in series with elliptical cross section with a bafe extending over the entire length to separated suspension chamber. Air (at the atmosphere pressure) and pulp stock to be de-inked is introduced into the cell chamber through injectors.Flow through nozzles generated vacuum which sucks in the necessary process and

generates micro turbulence resulting in widely ranging bubble sizes enabling efcient removal of an equally wide range of particles size. This enhances brightness to a high degree and reduces dirt specks and stickies efciently. The injectors optimize the quantity of the air injected and the size of the bubbles generated. The pulp stock freed from ink is pumped from the bottom of one cell to the next cell. The ink laden foam overflows to the foam chamber with the help of motorised paddle.

FLOTATION CELL

Flotation process operated a continuous mode and helps to remove ink particles efficiently. Since the cells are interconnected by opening only level control system is required for entire otation machine.

The primary flotation stage ensure highest possible stock purity and the secondary stage optimized otation yield without an loss of brightness and cleanliness. A De-aerator cyclone removal air from the stock and usable ber are recovered from the foam.

Features

Highest possible degree of brightness is achieved.

Improved optical cleanliness in recovered paper stock.

No sizing restrictions.

Single level control loop operation.

Optmized otation yield at secondary stage without loss of brightness and cleanliness.

Very low ber loss in the de-inking process as the foam is treated in a cascade process.

High percentage of ash in reject resulting in low ber losses.