WCA September 2019

Technology news

ROSENDAHL’S ROBI high-speed low-tension cross-binder was deve- loped for binding SZ-stranded loose tubes. Ever-smaller cable designs and softer materials require the ongoing development of this stranding method. The new integrated yarn tension measurement of Rosendahl’s ROBI allows consistent and, if required, very low binding tension during high-speed production. Integrated yarn tension control Speed is usually a key factor of performance. With a line speed of up to 200m/min, the loose tubes are stranded at 2,500rpm. However, speed alone does not fulfil all the requirements a manufacturer has for a production line. Integrated components also have to react precisely at high speeds.

minimum yarn tensions of 2 newtons, which cannot be achieved using conventional binders. These constant tension forces contribute to optimum results in fibre optic production and minimise scrap. Benefits include: • The cross-binder with integrated yarn tension control meets the requirements of new cable designs and materials (micro-tubes, soft- bundles) • The integrated torsion lock is located directly at the binding point, which allows for very short reversal lengths • Large yarn bobbin sizes allow for long production lengths and reduced setup time • Suitable for dual-end yarn, offering higher production speeds • Easy to integrate as an upgrade for existing lines Rosendahl Nextrom – Austria Website : www.rosendahlnextrom.com

New materials and optimisations of cable designs in terms of com- pactness, number of fibres, material consumption and production costs constantly pose new challenges for cable manufacturers. A few years ago, a loose tube with 12 fibres had a diameter of 2.8mm. Today, the same loose tube has a diameter of only 1.4mm. Low binding forces are a quality criterion when stranding such cores. The newly developed yarn tension binder from Rosendahl with integrated yarn tension measurement enables

❍ Rosendahl’s improved and sensitive cross binder

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Wire & Cable ASIA – September/October 2019