World ’ s largest kraftliner machine installed in Obbola , Sweden
Voith delivered the entire production line , including a comprehensive service , spare and wear parts package , as well as automation and digitalisation solutions .
Voith has launched the world ’ s largest kraftline machine for SCA . It is expected to significantly increase the latter ’ s production capacity . Not only is this machine special in its size ; it is also made with sustainability in mind .
By Alexandra Kist , Stainless Steel World
At the beginning of November , Voith successfully started up the world ’ s largest kraftliner machine for SCA , the Swedish forest industry company , at its Obbola site . The machine features a design speed of 1,400 meters per minute and a wire width of 10,200 mm . The Voith XcelLine paper machine will produce 725,000 tons of high-quality kraftliner per year with basis weights between 100 and 200 gsm . Compared to the old line , the new machine increases SCA ’ s production capacity by 270,000 tons .
“ Thanks to the excellent cooperation with Voith , the start-up of the most modern kraftliner machine took place ahead of schedule ,” says Per Strand , Project Director at SCA . “ The highly efficient solutions reduce our resource consumption and enable maximum productivity with the lowest overall production costs .” Voith supplied the complete line , the heart of which is a highly efficient XcelLine paper machine . In addition ,
Stainless steel and corrosion-resistant alloys in the paper industry
The overview below is not a complete one . Instead , we have used examples from the Nickel Institute to give a general summary of most commonly used stainless steels and alloys . Stainless steels and nickel-containing alloys have a long and successful history in the pulp and paper industry , finding applications in all aspects of the industry . Austhenitic stainless steel and , most recently , duplex stainless steels are used in digesters . Those are typically used in batch cooking , which is a type of chemical pulping process . For oxygen delignification , standard and lean duplex grades are used . The sulphite process entails the production of chemical pulp , and in this endeavour , type 316L stainless steel has become the principal material of construction for sulphite mills , although more highly-alloyed materials are required in a number of specific applications . Duplex stainless steels have been specified , due to their excellent resistance to pitting corrosion and stress corrosion cracking , by chloride ion . There are also several applications where specialty alloys , such as Alloy 20 , 6Mo alloys , G30 and C276 ( UNS N10276 ) prove advantageous . When it comes to suction rolls , which are used to remove water from paper at the wet end of the paper machine , the following materials are used : nickel aluminium bronze , forged Type 410 ( UNS S41000 ) along with centrifugally cast stainless steels Type CA15 ( UNS J91150 ), CF3M and CF8M ( UNS J92900 ).
Source : The Nickel Institute
34 Stainless Steel World March 2023 www . stainless-steel-world . net