Pumps

Many different types of pumps are used in a paper factory, as the different processes place very specific demands on the pump technology. These pumps convey liquid, viscous or solids-laden media, control the supply of chemicals and support water treatment. Here is an overview of the commonly used types of pumps and their applications:

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1. Progressive cavity pumps

- Application:

- Conveying pulp (fiber mass).
- Transporting highly viscous coating masses.
- Treating sludge and solids in wastewater treatment.

- Properties:

- Suitable for abrasive and highly viscous media.
- Gentle conveying of sensitive materials such as fibers.

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2. Centrifugal pumps

- Application:

- Transporting large quantities of liquid such as water, chemical solutions or pulp with a low solids content.
- Circulation in paper machines and cooling systems.

- Properties:

- High flow rates.
- Ideal for thin fluids with low viscosity.

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3. Peristaltic pumps

- Application:

- Delivery of sensitive or abrasive chemicals.
- Dosing of dyes, additives or adhesives.

- Properties:

- Very precise dosing.
- No direct contact between medium and pump, ideal for corrosive substances.

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4. Diaphragm pumps

- Application:

- Transport of chemicals such as acids, alkalis or dye solutions.
- Delivery of sludges and media with a high solid content.

- Properties:

- Chemically resistant.
- Self-priming and pressure-resistant.

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5. Gear pumps

- Application:

- Delivery of coatings, resins, oils or adhesives.

- Properties:

- Precise and consistent delivery rate.
- Well suited for highly viscous liquids.

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6. Screw pumps

- Application:

- Transport of highly viscous media such as coatings or pasty materials.
- Gentle conveying of sensitive substances.

- Properties:

- High efficiency with viscous media.
- Low shear forces.

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7. Piston pumps

- Application:

- High pressure applications such as pumping water when cleaning paper machines.
- Dosing of chemicals.

- Properties:

- High pressure build-up possible.
- Very robust and durable.

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8. Submersible pumps

- Application:

- Wastewater and sludge pumps in wastewater treatment.
- Drainage of pits or containers.

- Properties:

- Easy installation in liquids.
- Robust against abrasive media.

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9. Peristaltic pumps

- Application:

- Dosing and conveying of sensitive or highly viscous media.
- Use with abrasive or chemically aggressive substances.

- Properties:

- Gentle conveying.
- Very good dosing accuracy.

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10. Vacuum pumps

- Application:

- Generation of vacuum in paper machines to dewater the paper.
- Drying processes and water separation.

- Properties:

- High negative pressure for efficient dewatering.
- Robust and durable.

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11. Conveying pumps (e.g. sludge pumps)

- Application:

- Transport of viscous, solid-laden media such as recycled material or residues from paper production.

- Properties:

- Wear-resistant.
- Powerful for high solid content.

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Summary by process

1. Pulp production:
- Eccentric screw pumps, centrifugal pumps.
2. Painting and coating:
- Screw pumps, gear pumps.
3. Chemical addition:
- Diaphragm pumps, peristaltic pumps.
4. Wastewater treatment:
- Submersible pumps, eccentric screw pumps, hose pumps.
5. Paper machines:
- Centrifugal pumps, vacuum pumps.

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Conclusion

The variety of pumps in a paper mill reflects the different requirements that exist in paper production and the accompanying processes. The correct selection of the pump for each specific task is crucial for the efficiency, quality and operational reliability of the entire plant.