14 INDUSTRY NEWS 14 XERIUM
Pulp Paper & LogisticsPulp Paper & Logistics
Aiming for higher efficiencies on tissue making lines
New fabric, felt and roll cover technology has been introduced to tissue manufacturers by Xerium, as explained by Oliver Baumann, Robert Marchhart and Glen A Harvey
H Formsoft
On modern tissue machines, the barrier to increased production and improved sheet quality is often the forming zone. Its overall ability to rapidly drain water while simultaneously controlling fibre orientation and fibre distribution in the sheet can dictate the amount and quality of the volume produced. A critical component of the tissue forming zone is the forming fabric which has three major requirements:
• High fibre support (FSI) and uniform cross machine direction (CMD) oriented paper side Very low basis weights and higher operating speeds require high fibre retention, uniform fibre distribution and improved sheet transfer. To achieve these objectives, the forming fabric surface must have a fine CMD oriented surface to support – and form – the mainly MD-oriented fibres.
July/August 2014
igh-performance tissue machines demand high-performance products to enable
sustained quality, speeds and drying efficiency. Two recent innovations from Xerium – which embraces the companies Huyck. Wangner, Stowe Woodward, Weavexx and Mont Hope – are delivering these increased performance levels enabling these world-class tissue making machines to run faster and with greater economic efficiency.
Figure 1: Formsoft’s symmetrically woven design
• Straight-through drainage for rapid water removal and no water carry As production rates increase, drainage times decrease. The sheet side of the forming fabric should determine the amount and the orientation of drainage resistance, while the machine side should be open to allow water to exit easily during sheet formation, and, to minimize shower water flow resistance on the return run.
• Structural stability and wear resistance Although the paper side of a tissue forming fabric contributes to the structural stability, the machine side of the fabric is primarily responsible for fabric stability and useful life. The goal is to deliver the these properties, while increasing the economic life of the forming fabric. Forming fabric design must balance the need for fibre retention, drainage and life. This inspired Xerium developers to create Formsoft, a new concept
tissue forming fabric specifically engineered to provide high- speed drainage over a short forming length, while retaining exceptionally high fibre support. It features a symmetrically woven design that ensures dimensional stability and uniformity for the life of the fabric (see Figure 1). The top side improves the sheet’s tensile strength, formation and hand feel, while the bottom structure provides extended life capacity. Compared to conventional triple
layer designs, Formsoft provides significantly higher FSI (plus 6 per cent at the same Perm), and up to 10 per cent lower fabric caliper. It also provides measurable improvements in production rates, CD basis weight profile, tensile strength (MD and CMD), softness, and formation.
Huyspeed - efficiency for your tissue machine Due to the rapid adoption of Crescent-former machines in recent years (where the tissue sheet is formed between the
forming fabric and the tissue felt), demands placed on tissue felt technology have increased significantly. Modern tissue felts require very high fibre anchorage with uniform surface characteristics. In addition, the modern tissue felt can play a key role in overall machine productivity and energy consumption. Since the market introduction of Huyspeed, the product line has evolved into an indispensable clothing design for demanding tissue machines. To provide highest machine
efficiency right from the start- up, Xerium developed Huyspeed based on a specially engineered yarn. The resulting construction is characterised by high elasticity in the nip direction providing increased dewatering at the suction press roll. As a consequence, reduced steam consumption at the Yankee cylinder and lower hood temperatures at wet end/ dry end are achieved. This leads to the advantage of lower energy consumption and therefore a profitable runnability is provided. In addition the new yarn delivers increased profile uniformity, one of the major requirements of modern and demanding tissue machines.
Advantages summarized into valuable savings and wider operation window The Huyspeed product line covers the broad application needs of Tissue felts. With both the (1+1) laminated version Huyspeed GU
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