Screw press
Dewatering is made to thicken the pulp consistency from as low as 3% and up to 35%. A high consistency pulp entering the heating zone will ensure a low steam consumption, and a better dispersion result.
Hot Dispersing System (HDS)
As the most advanced system the HDS produces the best dispersing results. It is also the most flexible system, with optional features such as in-line bleaching. The key feature of hot dispersing is treatment with high temperature at high pulp consistency. This leads to many advantages: improvement of fiber properties, reduction of bacteria, and softening of dirt and tacky contaminants for a more efficient dispersing. Retention time is 2 minutes at a temperature of up to 120°C (248°F).
The system is further described below – with all the treatment steps for dewatering, heating, dispersing and bleaching.
Dewatering zone
Heating zone
Plug screw
The heating zone is sealed by a plug screw, in order to achieve a low steam consumption and flexible operating temperatures. Shear forces introduced by the plug screw creates a pre-dispersing effect.
Shredder
Before heating begins, the pulp is shredded into fine pieces. A fine and uniform pulp ensures that all fibers and contaminants reach the required temperature in the pre-heater.
Pre-heater
The pulp is heated to a uniform temperature of 90-120°C, depending on raw material. Wax, hot melts and stickies reach their melting point so that the contaminants’ strength properties are weakened.
Dispersing zone
Infeeder
The infeeder feeds the pulp from the pre-heater to the disperser. The infeed zone of the disperser has patented features that decreases risk of blocking, and contributes to a low energy consumption.
Disperser
The fibers pass through a narrow gap between rotating discs, where any impurities are disintegrated to an invisible size. The devil-tooth pattern of the discs is optimized for each pulp mixture in order to achieve a gentle treatment of the fibers. Adjustment of the disc gap can be done on-line with an accuracy of 0,01 mm.
Discharge plug screw (optional)
A discharge plug screw at the outlet of the disperser is an optional feature that enables high consistency discharges of up to 35%.
Booster pump (optional)
The Grubbens pump is suitable for use directly after the disperser. This solution is optimal for medium consistency discharges of 8-12%.
Bleaching
Pre-bleaching (optional)
Chemicals for pre-bleaching are added at the first plug screw. Bleaching is done in the heating zone where the pulp is under pressure and at high consistency. This leads to minimum dilution effect, low use of chemicals, and low energy consumption.
Post-bleaching (optional)
Chemical post-bleaching is done at the disperser. The process with both pre-bleaching and post-bleaching means that different temperatures, pulp consistencies and chemical types can be used in the two steps.
Our services
Support throughout the whole product lifecycle
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Pulp & Paper Pilot plant trials
Test your material in our pilot plant and analyze machine performance in our lab!
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Engineering and project based deliveries
Customized designs for your unique application.
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Start-up
Full service on site with your machine delivery.
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Global support
We have offices in Sweden, Canada, Germany, China, and agents all over the world.
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Service visit
Let us visit your plant and help you improve performance!
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Contacts
Are you in need of technical support or wear parts for your machine? Interested in a visit from our staff or a project quotation? Please contact one of our local offices around the world!
sales@cellwood.se
+46 380 76000
Johan Göth
Sales & Marketing Director
Phone: + 46 (0)380 76092
Mobile: + 46 (0)70 200 0928
Email: johan.goth@cellwood.se
Sweden
Niklas Tunell
Area Sales Manager, N & S America
Phone: + 1 416 925 8772
Mobile: + 1 416 704 0147
Email: niklas.tunell@cellwood.se
Canada
Sweden
Christian Stiller
Area Sales Manager
Mobile: + 46 (0)70 760 8183
Email: christian.stiller@cellwood.se
Sweden
Åsa Billfeldt
After Sales Manager
Phone: + 46 (0)380 76021
Mobile: + 46 (0) 70 322 02 22
Email: asa.billfeldt@cellwood.se
Sweden
Gith Cedulf
Marketing Coordinator Spare Parts
Phone: + 46 (0)380 76018
Email: gith.cedulf@cellwood.se
Sweden
Sweden
Stefan Virtanen
Technical Manager
Phone: + 46 (0)380 76025
Mobile: + 46 (0)72 731 3368
Email: stefan.virtanen@cellwood.se
Sweden
Tomas Anarp
Senior Technical Advisor
Phone: + 46 (0)380 76014
Mobile: + 46 (0)70 644 8478
Email: tomas.anarp@cellwood.se
Sweden
Sweden
India
Kevin Klassen
Managing Director, Germany
Mobile: + 49 (0) 151 14152575
Email: kevin.klassen@cellwood.de
Germany
Frank Hinterwälder
Sales & Application Manager
Mobile: +49 (0) 151 15381576
Email: frank.hinterwaelder@cellwood.de
Germany
Frank Jiang
Managing Director, China
Phone: + 86 21 5496 1756-808
Mobile: + 86 138 1680 0426
Email: frank.jiang@cellwood.se
China
Kent Xu
Senior Erection Supervisor
Phone: + 86 21 5496 1756
Mobile: +86 138 1642 5353
Email: kent.xu@cellwood.se
China
Tony Lu
After Market Sales Engineer
Phone: + 86 21 5496 1756
Mobile: + 86 188 0191 0507
Email: tony.lu@cellwood.se
China
