engleski

Investigation of the strength of ultrasonically welded sails

Purpose – Today when the newest high-tech fibers and sophisticated material constructions are used for the production of sails, forming 3D sail shape from 2D sailcloth has still remained very primitive because classic sewing techniques are mostly used. Since, the clothing and technical textile industry has been recently using some of contemporary joining techniques (ultrasonic, thermal, high-frequency) replacing classic sewing, this paper seeks to investigate the possibility of ultrasonic welding in the production of sails, and the strength of obtained bonds. Design/methodology/approach – Concerning the aim, sails were made employing the classic and modern (ultrasonic) joining technique whereby bonding parameters such as amplitude and welding speed, geometry of anvil wheels were varied. Objective quality evaluation of the bond made in such a way, was performed in order to be more exact about its strength. Findings – Based on the obtained results it has been concluded that ultrasonic welding may successfully replace the classic sewing of sails, selecting an anvil wheel with suitable engraving and optimal parameters of welding (speed and amplitude). Practical implications – Selection of optimal welding parameters not only increases the sail’ s bond strength in comparison with classic seam, but also provides sail air impermeability, being one of the basic aerodynamic requirements for sail making. Originality/value – This paper has presented the novel and successful approach in 3D sail shape forming from 2D sailcloth.

Technology led strategy; Textiles; Naval vessels; Ultrasonic welding; Seam welding

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