D - Textiles – Paper – 01 – D
Patent
D - Textiles, Paper
01
D
18/556
D01D 5/22 (2006.01) D01D 13/02 (2006.01)
Patent
CA 1051160
ABSTRACT OF THE DISCLOSURE The invention relates to 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 a least 100°C after which they are then drawn. 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 round that n useful crimp of at least 2 crimps per centimetre develops after the filaments sire relaxed. This crimp may develop either spontaneously (that is to say without any further step of treatment) or after a further stage of heat treatment. The most important advantages result from the use of a spin-draw speed of 100 metres per minute or less since such low speed greatly simplify the overall process. Snubbing rollers are provided for controlling the level of tension running back from the drawing zone to the heating zone. If a further heat treatment is necessary in order to cause the crimp to develop, this may be applied either to the filaments or to products produced therefrom when in h relaxed state sub- sequent to drawing.
196037
Mackie Gordon
Mcmeekin Samuel
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