Double-pass cooling calendering
![Double-cooling calendering_768x432.jpg](/contentassets/44142a3e56f049d3891638882d0181cb/aqua-cooling-calendering_768x432.jpg?width=1290&format=webp&quality=70)
Valmet’s latest solution for bulk-saving is double-pass cooling calendering. This new patented technology improves the calendering results compared to usual production conditions. With conventional roll nip, the best calendering results are achieved when the web is cool and stiff, like in pilot trials. With double-pass cooling calendering technology, pilot-type conditions are brought to production-level, by cooling down the web before the calendering nip.
Raw material savings with higher bulk
Energy savings
Compact design - easy for rebuilds
More lightweight end-product
Double-pass cooling calendering enables the production of more lightweight end products without compromising functional and visual properties. This will lead to a substantial reduction in energy and raw material usage.
Web cooling is enabled by cool dry air blown on both web surfaces. Thanks to the compact design of this new technology, double-pass cooling can be retrofitted to practically any production line.
Cooler the web, higher the bulk
The dry air is blown on the web with the OptiDry Chill air web cooling units. OptiDry Chill double pass units presented on the left cool the web twice longer than the conventional cooling units on the right. For each 10 °C of lower web temperature, you'll get ~1 %-unit higher bulk!
Double-pass cooling technology complements Valmet's bulk-saving calendering offering, which includes the revolutionary metal belt calender as the ultimate lightweighting solution. With double-pass cooling technology, it is possible to get almost half of the metal belt calendering benefits with lower investment costs.
![](/contentassets/44142a3e56f049d3891638882d0181cb/image_-u-turn-vs-straight.jpg?width=630&format=webp&quality=70)
![Want to talk to our calendering experts?](/contentassets/f9db5aff6384438fa03ac1ad84c9ea13/cta-1.jpg?width=630&format=webp&quality=70)
Want to talk to our calendering experts?
If you wish to get further information like technical specifications, need a quotation, or wish to discuss different solutions, fill in the contact form and our experts will contact you shortly.
Contact our expertsRelated products
Interested in pilot trials?
Get in touch with our pilot trial experts to discuss how you could benefit from our pilot trial services.
Contact our pilot trial expertsLearn more about the services and automation solutions for calenders
![How to plan a successful rebuild?](/contentassets/d88095676f3a4b67bb1c7837822401de/call-to-action_rebuild-03-1.jpg?width=630&format=webp&quality=70)
How to plan a successful rebuild?
Rebuilding a paper or board machine can improve the competitiveness of your business and your processes. But where do you start? Download our e-book to learn how to develop a winning rebuild concept, how to minimize rebuild related risks, and how to ensure smooth ramp up to full production.
Download e-bookExplore our latest board and paper press releases
- Sep 5, 2024Valmet to start change negotiations in Finland in its Paper business line’s Board and Paper Mills business unit
- Aug 16, 2024Valmet and Spinnova Plc sign a partnership agreement regarding process equipment for textile fibre production
- Aug 1, 2024Valmet closes the agreement to acquire majority shares in FactoryPal, a subsidiary of Körber
- Jul 8, 2024Valmet to supply operator training simulator to Graphic Packaging International in Waco, Texas, United States
- Jul 2, 2024Valmet to supply a high-capacity winder to Wuzhou Special Paper in China
- Jun 26, 2024Valmet to supply both a papermaking line and a paper machine rebuild to a customer in Asia-Pacific
- Jun 25, 2024Valmet to deliver a tissue machine to Andhra Paper in India
- Jun 19, 2024Valmet receives the second order of converting lines to Metsä Tissue in Mariestad, Sweden
- Jun 13, 2024Valmet and Flootech enter partnership to advance water treatment for the board, paper and tissue industry
- May 30, 2024Valmet enters joint venture with Körber to advance the digital offering to the tissue industry