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Nozzles, atomizers, shower pipes, and tank washing nozzles for the paper industry

Nozzles, atomizers, shower pipes, and tank washing nozzles for paper mills

PNR Italia produces and distributes spray nozzles, shower pipes, atomizers and washing heads for the paper industry.

In the paper industry,water is one of the main components: in the initial stages of paper production , the solution is 95-97% water and 3-5% pulp and fiber.
Various chemicals are added to the pulp through nozzles during the long paper production cycle. The water is used for cleaning cloth and felt through other nozzles mounted on spray pipes.

Applications

Reduction of electrostatic charges
Reduction of foams in reservoirs
Tissue coupling

Wetting of paper
Chemical injection

Washing of training cloths
Cleaning of felt, fabrics, rolls, canvas

Paper trimming at the end of the production cycle
Starch spraying

All applications

Infografica dei processi di Cartiera

PNR Italia’s spray nozzles, shower pipes, atomizers, and washing devices are used in all stages of paper production.

Spray nozzles and other products have many applications, including starch treatment, paper wetting, cleaning of felt/threads/fabrics /rolls, washes, foam abatement in headboxes, and paper trimming at the end of the production cycle.

Products

Sefl-cleaning filters in the paper industry

Automatic industrial filters in the paper industry

GO TO SELF-CLEANING FILTERS PAGE

Mixture preparation phase

It is the phase in which the dough is formed that will then turn into paper. The first procedure is to insert the recycled paper and cardboard with plastic and ferrous waste in the pulper. This operation recovers the cellulose fibres that are well-separated and hydrated. The product of this section is called suspension and consists of fibres suspended in a 4% aqueous solution. After the pulping stage, the refining stage follows, where fibre bonds increase. The following three phases are mixing, dilution, and purging.

Recommended products for the mixture preparation phase in the paper industry

For the abatement of foams in the preparation of mixtures, we recommend using full cone nozzles from the D series.

The forming section

The obtained mixture – mixed, diluted, dosed, and purified – is ready to be transformed into a sheet of paper.
The fibrous suspension reaches a metal container called a “headbox,” the first part of the machinery that deals with paper production. We are inside the Fourdrinier machine, which is responsible for carrying out all the phases of paper production. In this machine, the paper sheet is generated without interruptions. This is the moment when the dough is distributed evenly and continuously on the paper-forming net.

In the forming section, the suction boxes—i.e., drawers below the canvas that progressively draw water—remove water from the fibrous tissue. At the end of the canvas area, the sheet has a water content of 60-70%. This phase determines the final weight and thickness of the paper.

Recommended products for the forming section in the paper industry

For the training phase in the paper industry, we recommend the use of the hollow cone nozzle P for starch spray, the GMA straight jet nozzle for paper refill, the K HIGH flat jet nozzle for blast chiller, the GEA straight jet nozzle, GF flat fan nozzle and shower pipes for washing and conditioning the forming cloths.

The press section and the drying area

Once removed from the canvas, the sheet of paper continues on a felt towards the Presses section.
In this area, heated steel cylinders exert a uniform pressure on the sheet surface, which loses further humidity percentage.

For the tape to adhere perfectly to the cylinders, drying felt presses against their surface also to absorb further water. From this point on, the sheet’s dehydration takes place by heat in the bucket, where the paper passes between heated cylinders with progressively increasing temperatures.

Recommended products for the press and drying area in the paper industry

We recommend the use of the ZPB nozzle clamp, the GX flat jet nozzle and the HTQ flat jet nozzle for single-lens spray.

The set up section

These are the production stages following the drying process.
The paper roll is transformed into rolls and/or sheets laid out. The sheet, ready to be rolled up, is wrapped on itself by a winder called pope. The so-called mother coil is formed, weighing several quintals and with a width equal to the machine’s working width.

The phases that are part of the setup section and that conclude the entire paper production process are:
– rewinding
– cutting with circular blades (trimmers) and winding
– Cutting into sheets
– Packaging and labeling.

Recommended products for the set up section in the paper industry

We recommend using MX and MW atomizers to abate electrostatic charges in the last phase of the paper production cycle.

Washing of cloth and felt

Self-cleaning shower pipes for washing cloth and felt in the paper industry

Paper making requires a great deal of water. Waste water is often reused to clean filters and felts to save costs and reduce water consumption. Reclaimed water contains solids and impurities that cause nozzles clogging and shutdowns for maintenance. Self-cleaning spray pipes and nozzles are the best solution to this. Their revolutionary design helps to improve a great deal both production efficiency and industrial competitiveness.

Self-cleaning spray pipes contain a rotating steel brush that can be automatically or manually operated and an escape valve at their outlet. The rotating brush removes all the dirt from the pipe walls using water.

The nozzle body contains a mobile piston and its opening and closing are controlled by the operating water pressure. For example, when nozzles wash mesh fabrics with an operating pressure of 3 bar, this pressure is higher than a spring force of 1 bar. Piston and nozzle body come close producing a flat fan. If the inlet pressure is reduced to 0.5 bar, lower than a spring force of 1 bar, piston and nozzle body separate opening to the maximum distance. Water pressure remains at 0.5 bar and removes any build up when back to normal condition.
Self-cleaning nozzles are easy to install, align and clean and ensuring relevant time and costs savings. The spring force is set depending on customer’s plant working pressure

TS – SHOWER PIPE
Other accessories

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