Continuous cleaning of forming wires, press felts and dryer fabrics - Paper Technology International 2023 - Paper Technology International 2023 - Flipbook - Page 68

Continuous cleaning of forming wires, press felts and dryer fabrics - Paper Technology International 2023

PAPERTECHNOLOGYINTERNATIONAL
Continuous cleaning of forming wires, press felts and dryer fabrics - Paper Technology International 2023
Or: How to lower water and power consumption and increase production efficiency and
output in Paper Machines at the same time.
Claus Robberts, Founder and Owner of ProJet b.v.
INTRODUCTION:
In a paper machine, there are 3 main stages or sections of the manufacturing process, all having their specific task to obtain the
desired paper properties:
• Forming Section: formation of the sheet (strength, thickness, etc)
• Press Section: surface properties (printability, etc)
• Dryer Section: dryness at the end of the production process
Each section has one or more conveyors to support the paper sheet while it’s being manufactured; Wires in the Forming Section,
Felts in the Press Section and Fabrics in the Dryer Section. The conveyors are generally referred to as “Paper Machine Clothing” or PMC.
The benefits of consistently clean machine clothing
Clean PMC, with consistently high permeability and
dewatering capabilities, delivers important productivity and
performance advantages. Consistently clean Forming Wires give
better dewatering in the Wire Section which leads substantial
improvement in dryness level when the sheet leaves the Forming
Section, into the Press Section. Forming Wires loose dewatering
ability when contamination builds up over time during production.
Cleaner Press Felts assure improved sheet surface, better
dewatering and therefore higher dryness levels when the sheet
enters the Dryer Section, so less drying energy is required there.
Clean Dryer Fabrics with high permeability or porosity provide
highest drying capacity so less steam consumption is required. At
the same time, much less contamination will be deposited on dryer
cans, doctor blades, and felt rolls.
More and more contamination (fillers, broke, pitch, stickies,
etc.) can be found on PMC caused by an increasing use of
secondary fibers, recycling of coated broke, increasing use of sheet
fillers, an increased use of recycled mill water supplies, and the
increased use of process chemicals.
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ProJet clean
Advantages of Continuous PMC Cleaning
ProJet is a globally operating company with over 30 years
experience in designing, manufacturing and supplying innovative
High Pressure Cleaning systems for paper machines. Over 1,500
ProJet cleaning systems are successfully installed and running
in paper manufacturing processes worldwide. The ProJet system
consumes very little water, compressed air, and very little electrical
energy; all much less than conventional cleaning showers. This
innovative cleaning system is being applied successfully to very
low basis weight paper product as well has heavy weight paper
board applications. Applying a ProJet Cleaning Solution guarantees
consistently clean PMC from beginning to end of the usable
life, while using a minimum of utility resources. Consistently
clean PMC delivers the following significant manufacturing
advantages:
•
Conventional HP showers can be switched off
leading to enormous water consumption and power
consumption savings.
•
No shutdowns will be required for manual or
chemical PMC cleaning. This will provide increased
manufacturing productivity and profitability.
•
Maintaining consistently high PMC permeability and
dewatering capabilities increases dryness and quality of
the sheet, leading to less reject and higher profitability.
•
Better CD sheet moisture profiles will be maintained.
•
Sheet curling, caused by uneven moisture profile, will
be eliminated.
•
PMC life will be substantially improved.

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