First Metal Belt Calender for Fine Paper Starts up at Sun Paper Mill in China
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Yanzhou Huamao Paper Industry Co., member of Sun Paper Group, in Yanzhou city, Shandong Province, China, has started up a Metso-supplied ValZone metal belt calender on its PM 23 fine paper machine. The line was previously operated with a soft calender. The Metso paper machine has a wire width of 7.85 m and a design speed of 1,600 m/min, and produces approximately 350,000 metric tpy of uncoated fine papers.
With the metal belt calender, the line is able to produce top quality printing paper grades with superior feel and visual appearance, Metso notes. The ValZone metal belt calender allows raw material optimization, for instance by allowing an increase in the filler content of the sheet. Also, as a result of increased bulk, the same printing qualities can be reached with a lower grammage.
The delivery is a repeat order of the ValZone technology as Sun Paper Group's coated board line PM 22 also is equipped with metal belt calendering. The ValZone metal belt calender on PM 23 is the first installation for fine paper grades.
"This startup is a milestone that brings the metal belt calendering technology into a whole new area of application. It is now for the first time used for printing papers and for the first time in a wide and fast paper machine, thus demonstrating that the metal belt calendering technology has a lot of potential with regard to future development," says Timo Valkama, senior paper technology manager, Metso's Paper business line.
The Sun Paper Group is one of the foremost paper and board producers in China. Altogether, the group runs 22 paper machines mostly producing printing and writing grades with a combined capacity well exceeding 2.2 million metric tpy. Sun Paper Group employs more than 7,000 people.
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