Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics (yarns per se D02G3/00; during formation of artificial filaments, threads, or the like D01D5/22; general aspects of chemical treatment D06M)

Child Classifications

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• D02G 1/002
• D02G 1/004
• D02G 1/006
• D02G 1/008
• D02G 1/02 by twisting, fixing the twist and backtwisting, i.e. by imparting false twist
• D02G 1/10 using knife edges, e.g. heated knife edges, for edge crimping
• D02G 1/12 using stuffer boxes
• D02G 1/14 using grooved rollers or gear-wheel-type members
• D02G 1/16 using jets or streams of turbulent gases, e.g. air, steam
• D02G 1/18 by combining fibres, filaments, or yarns, having different shrinkage characteristics
• D02G 1/20 Combinations of two or more of the above-mentioned operations or devices; After-treatments for fixing crimp or curl