Pulp Paper & Logistics
XERIUM EUROPE 15
for each application world-wide, customised to individual customer requirements. Huyck.Wangner is first to offer a
product line using EDC to improve machine runnability, efficiency and paper quality in the paper making process. The forming fabric portfolio will be progressively replaced by fabrics having the new EDC characteristics. Following the introduction of Finetexx DC/ Finetexx XL to the newsprint/ graphical grade sector, the company has launched Formexx/ Formexx XL, which is applied in the manufacture of writing and printing grades Forming fabric running side
material: There are already materials available on the market with the same target of reducing drive load energy. The only material available up to now that reduces the friction coefficient of the fabric, also leads to a reduction in wear life. Secondly, the existing material is limited in the available diameter range, which leads to a limited application scope when it comes to paper grades and the types of paper machines. A joint development with a
yarn manufacturer resulted in a special running side material which combines the low friction to the dewatering elements with very high abrasion resistance. Thus the drive load can be reduced without any compromise in fabric life or stability. The new material technology, introduced under the name EnerSTAR, can be employed to a wide range of forming fabric applications, as there is no general limitation in terms of yarn diameters.
Summarising, the new
technology material offers: • reduced drag load, which leads to less energy consumption
• increased abrasion resistance, which leads to longer fabric life
Figure 4 September 2013
Figure 3: Channel shape, Real drainage channels (source; University Grenoble)
• increased fabric stability. Both Huyck.Wangner’s EDC
technology and EnerSTAR running side material technology were recently introduced to the market to improve machine runnability, efficiency and paper quality. Field results of either of the
two technologies illustrate the expected benefits. The combination of both technologies, EDC together with EnerSTAR, provide even larger potential.
Case history A hybrid former running wood- free grades was running in trials at 1,000 metres per minute with the target of: • Reducing the energy consumption
• Improving the paper quality • Life time increase, to reduce down time. To address these customer demands the focus was set on ‘sheet structure’ as the key parameter. The control of the dewatering over the table was vital to impact the sheet forming
process to optimise the sheet structure. Therefore the bottom design was changed to an EDC product to control the initial sheet forming process by the use of the Engineered Drainage Channel technology. This patented technology allows for balancing the dewatering in the way that an open easier-to-dewater sheet structure, better paper quality and highest overall dewatering are achieved at the same time. In addition the bottom fabric was equipped with a long float running side structure combined with the special EnerSTAR material to enable further friction reduction on the dewatering elements and to increase their life. The new wire combination showed very high drainage capacity, more controlled initial dewatering, leading to higher dryness and better fiber retention. Due to the specially designed channel improved sheet formation could be detected immediately. To measure the reduction in energy consumption a complete
analysis of the drive loads for each paper grade was carried out. The key part of this analysis was to guarantee comparability by selecting the data by both paper grade and for similar speed and vacuum levels. As a result the analysis confirmed
that the drive energy consumption had been reduced over all grades with the new EDC and EnerSTAR technology. The reduction varies over the paper grades and on average adds up to 17 per cent. Secondly, the fabric life could be increased largely due to reduced wear and higher wear resistance on the running side. This fact leads to remarkably less downtime.
• Oliver Baumann is Vice President of Technology Forming Fabrics Global, Xerium Europe. Email:
oliver.baumann@huyck.wangner. com Stephan Ernst is at Product Management & Applications Forming Fabrics, Xerium Europe. Email:
stephan.ernst@huyck.
wangner.com
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