Air-blow devices in melt-spinning machines for chemical fibres. Part III. The effect of the coo ling conditions
on the quality of fibres and possibilities of reducing this effect
The effect of the time-variable conditions of cooling of fibres during their formation has been discussed. This effect reveals itself not only in the form of linear mass variation(Uster's irregularity) but also in the variation of the supermolecular structure (microstructure) of fibrils. The effect of the microstructure variations on the appearance of final products, inparticular after dyeing, Has been stressed, what is due to an uneven sorption of dyestuffs by fibres of different supermolecular structure. Those parameters of the cooling process which decide the fibre properties due to the Dynamics of fibre formation have been pointed out. They are above all turbulency of the air blown and pressure pulsation in the zone of fibre formation. Simultaneously, the methods of controlling these parameters, in particular in relation to the preparation of cooling air and to the protection of the formation zone against the negative effect of the surrounding gaseous medium have been presented.
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