7.3 Production of yarn from cottonised hemp fibres
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The wet, semi-wet or dry ring spinning processes are relatively slow. Rotor spinning (also called 'open-end spinning') is much faster. This requires short fibres of a few cm length. Among biobased fibres, cotton is a well-known example that can be spun this way. However, the 'short fibres' coming from the scutching and hackling processes (§7.1.1, 7.1.3) are still too long for rotor spinning. These hemp fibres can be made shorter and finer by means of cottonisation (§7.3.1), so that they can be spun into yarn like cotton by rotor spinning (§7.3.2).
§7.3.2 Spinning of short staple fibres
Further information
HOGENT, 2020. ‘Yarn technology 1: Mechanical spinning’ (Dutch)
Very broad information on yarns: types, structure, spinning methods (traditional, new and advanced), and properties.
https://issuu.com/communicatie-hogent/docs/garentechnologie_1
141 pages
Carl A. Lawrence, ‘Fundamentals of spun yarn technology’, 2003, CRC Press
Very comprehensive information on fibre raw materials, raw material preparation, spinning principles and techniques, yarn structure and properties, and background information on relationships between raw materials, processing and properties.
500 pages