D - Textiles – Paper – 01 – D
Patent
D - Textiles, Paper
01
D
18/557
D01D 5/12 (2006.01) D01D 5/23 (2006.01) D02J 1/22 (2006.01) D04H 3/16 (2006.01)
Patent
CA 1065564
ABSTRACT OF THE DISCLOSURE A process for the production of crimped filaments of semi- crystalline polyolefins or blends of polyolefins with other materials by melt spinning wherein at least a proportion of the filaments are rapidly and asymmetrically cooled from the melt, are formed into a tow or tows and subjected to a heat treatment of at least 100°C after which they are then drawn in two stages, the last of which is at a temperature of at least 70°C. Provided the extent of the heat treatment is adequate in relation to the nature of the polymer, the type and efficiency of the heating, the diameter of the filaments and the thickness of the tow or tows, it is found that a useful crimp of at least 2 crimps per centimetre develops after the filaments are relaxed and subjected to a further heat treatment which may be applied either to the filaments or to products produced therefrom when in a relaxed state subsequent to drawing. Prior to the further heat treatment, the crimp remains in a latent form and if one or more textile processing steps are carried out at this stage, improved bulk results. The most important advan- tages result from the use of a spin-draw speed of 100 metres per minute or less since such low speeds greatly simplify the overall process. The rapid asymmetrical cooling is preferably applied by directing cooling air at the filaments as they leave the spinneret plate. In general, the use of an air oven for the heat treatment is most convenient and to ensure that the extent of the heat treatment prior to the application of the drawing tension is adequate, snubbing means generally needs to be provided for controlling the level of tension running back from the drawing zone to the heating zone.
206683
Mackie John K.p.
Mcmeekin Samuel
LandOfFree
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