A system for reducing froth in paper recycling

A solution from PNR Italia ensures the accurate elimination of froth from a tank for paper recycling

A system for reducing froth in paper recycling

A solution from PNR Italia ensures the accurate elimination of froth from a tank for paper recycling

SCENARIO FOR THE SECTOR
The recycling of paper

Paper’s cellulose fibers can be recovered several times for many processing cycles.
It is possible to obtain a “secondary raw material” from paper and cardboard delivered through the separate collection. This material is used to produce new paper products. The paper recycling process takes place in dedicated plants and is divided into seven phases.
The dough obtained can then be started to the most suitable production cycle. In some of the phases, the froth may be in the tanks due to the chemical agents and it is vital to eliminate it to return the water to the plant.

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THE PROBLEM

Our technical department was involved in designing a system for eliminating the froth in a recycling paper mill.

Some froth may form in the tanks with cellulose and water during paper recycling. It’s crucial to eliminate the foam to put back water into circulation. For this reason, studying a system with spray nozzles and manifolds is essential.

Our technical department was involved in designing a system for eliminating the froth in a recycling paper mill.

PNR ITALIA SOLUTION

Our technical department designed a system of manifolds and spiral nozzles to reduce the froth.
The system consists of two types of E spiral spray nozzles arranged to have an overlap of the jet that does not exceed the tank boundaries. This optimizes the consumption of liquid and energy. A total of 4 nozzles are used, one of which has an opening angle of 90° while the other 3 have a 120° opening angle.

The nozzles are at 80cm height from the water surface, and the tank measures 14m2.

PLAN OF THE TANK
COVERAGE STUDY

1 | LIQUID INLET
2 | TANK
3 | LIQUID OUTLET
4 | OVERLAP
5 | NOZZLE COVERAGE
6 | NOZZLE

ADVANTAGES 

The chosen nozzles effectively cover the entire area of the tank, successfully reducing the froth.

FOCUS ON THE PRODUCT

E
SPIRAL FULL CONE NOZZLE

The full cone E nozzle operates on the principle of jet deflection, deviated by a spiral profile surface that determines the desired spray angle. Their unique shape minimizes occlusion and produces a broader spray coverage than other nozzles under the same operating conditions.

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