Abstract
The high potential of metal fibres for various technical applications including filtration, electrical, heat and cut resistance or composite applications is still not fully exploited due to their high production costs. This paper presents the development of a new process chain for spinning 100% metal spun yarns from planed metal staple fibres as an alternative to conventional metal fibres. The developed spinning process chain begins with a stretch breaking process to create metal staple fibre sliver with a narrow fibre length distribution and defined mean fibre length. Next, a drafting process on a draw frame is performed in order to produce highly uniform metal staple fibre sliver. This is the basis for the development of a flyer spinning process to realise high-performance metal spun yarn. Finally, the fundamental relationships between fibre properties, processing characteristics, semi-finished product properties and the performance of the resulting metal spun yarns are described in detail.
Highlights
The use of metal fibres for technical applications offers an enormous variety of possibilities for the targeted development of semi-finished products and components because of their special properties, such as high stiffness, strength and ductility, high temperature resistance, high thermal and electrical conductivity, good formability and permeability, corrosion resistance as well as recyclability [1,2,3]
Metal fibres are used in plant construction, the chemical and automotive industry as well as in environmental, process and industrial engineering [4,5,6,7,8,9]
The three different alloys: stainless steel DIN EN 10,088-1 1.4113, aluminium AlMg5 and copper Cu99 were initially tested to assess their suitability for the development of the spinning process chain (Fig. 1)
Summary
The use of metal fibres for technical applications offers an enormous variety of possibilities for the targeted development of semi-finished products and components because of their special properties, such as high stiffness, strength and ductility, high temperature resistance, high thermal and electrical conductivity, good formability and permeability, corrosion resistance as well as recyclability [1,2,3]. Other areas of application for metal fibres include seals, cut and vandalism protection, filters, exhaust systems, sound insulation, components for heat exchangers, friction linings for clutches, tire cord reinforcements and heating elements in home and clothing textiles [10,11,12,13,14,15,16] They are applied in composite materials, especially to improve impact properties. Such metal-enriched yarns are used, for example, as shielding in environments exposed to heat, explosions, or electromagnetic radiation [19,20,21]
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