PAPERmaking! FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 5, Number 1, 2019
JARSHIRE ON HIGH PRESSURE WATER JET TAIL CUTTING The Italian equipment specialist Weingrill has announced a new development within its range of tail cutters claiming that its HP-Waterjet is the best alternative to dry-end tail cutters with rotating blades, and that this new device offers major advantages over traditional cutting systems. Dry-end tail cutting Modern paper machines demand high reliability and performance. Today most have dry-ends equipped with fixed or rotating blade tail cutters, any of which provide an acceptable cut quality under ideal operating conditions – i.e. limited base weight range, high paper dryness and assuming a well sharpened blade. High-pressure water-jet cutting With the purpose of meeting evolving market demands, Weingrill has developed the HP- Waterjet Tail Cutter, whose working principle is based on the use of high-pressure water. In simple terms, the equipment is composed of one pumping station providing the water and one nozzle turni ng the applied pressure into a high velocity water jet. Paper can then be “cold cut” without any alteration of its chemical and physical properties. Fully automatic, the tail cutter has been specifically designed to provide an alternative tail cutting system to traditional blade tail cutters. The high-pressure water medium ensures no mechanical contact with the paper leading to a dust- and drag-free cut, and reduced threading downtimes. In addition, non-contact cutting eliminates the inconvenience of inevitable wear and tear and replacement relating to rotating (or fixed) blades, and the associated time losses. It should also be noted that high-pressure water cutting exerts lower cutting forces on the paper compared with traditional blade devices, which results in stronger sheet edges and reduced web breaks. With applications in all kinds of paper and board production, including coated grades, the HP- Waterjet provides for very reliable and successful tail threading that quickly reacts to paper breaks, so minimising associated production losses. In comparison with blade tail cutters the HP-Waterjet ensures the following benefits: • It is not subject to wear therefore not requiring continuous service (blade sharpening). • Airborne dust is eliminated significantly reducing paper breaks in addition to improving air quality and the overall working environment. • Due to its compact construction the water jet guarantees efficient paper cutting at high speed without disturbing or breaking the sheet. • The water jet exerts a lower cutting force on the paper. Consequently, the cutting operation is faster and smoother with reduced cross-machine cutting time, improving the efficiency of tail transfer from section to section. • The water jet does not require physical adjustments and it is not influenced by profile variations or sheet fluttering.
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