In tissue machines, pressing is a very brief and compact yet vital process for effective water removal. It therefore places great demands on the durability, maintenance costs and energy consumption of the roll covers in the press section.
Valmet offers a wide range of roll cover solutions with advanced dewatering technology for different tissue presses and roll positions. Polyurethane cover Press Roll Cover PH is our newest option for efficient tissue pressing, enabling high open area and void volume for efficient dewatering.
Our selection ranges from economical rubber covers for less demanding applications to state-of-the-art polyurethane roll covers that ensure improved press nip loading and constant operating parameters in demanding pressing conditions.
The press section also has a major impact on sheet surface properties such as tissue bulkiness and thickness. Achieving the desired tissue quality depends on water removal efficiency and the uniform properties of the roll covers. In addition to press roll covers, Valmet offers solutions for better dewatering and sheet dry content with Doctor Blade Dual, a doctor blade with two patented functions that solves roll doctoring problems in challenging press section positions.
Runnability and quality defects due to press nip profile variations cause problems with sheet quality and water removal, as well as increased energy consumption. Valmet iRoll Press creates new options for improving press function and offers a solution to these problems. In addition to improved press nip loading, iRoll Press provides an extended roll cover lifetime and smooth runnability.
Over the years, the Metsä Tissue Mänttä mill in Finland has become familiar with many of the aforementioned cover problems and challenges often encountered on tissue machines. Valmet and Metsä Tissue have a long history of collaboration in roll maintenance and roll cover development projects.
Interested in reducing your doctoring costs for soft-covered suction or grooved rolls to one tenth of your present costs? Valmet Doctor Blade Dual does just that and delivers optimal doctoring results even in the most challenging positions.
To optimize press nip efficiency for TM 4, SsangYong turned to Valmet. The main targets were to improve energy efficiency by lowering steam consumption through higher post-press dryness, and to get more uniform moisture profiles by improving dryness profiles.