Patent GB-859574-A (GB)
Title: Improvements in or relating to a method of treating an artificial or synthetic textile material
IPC: D06M10/02
Filed: 1957-05-30
Abstract: <PICT:0859574/IV(a)/1> An artificial or synthetic textile material including or consisting of fully set multifilament fibres is simultaneously exposed to an aqueous bath containing a fibre-shrinking agent and to ultrasonic waves in the bath. Continuous ultrasonic waves may be used, but intermittent or pulsed waves, especially in the form of damped oscillations, are preferred. Desirably the frequency of the waves is from 20,000-60,000 cycles per sec.  Damped oscillations may be generated by the periodical discharge of a capacitor 10 into an oscillatory circuit, and trans-transferred to a body 8 capable of vibrating (a magnetostrictive vibrator, e.g. a nickel tube, or a piezo-electric vibrator), which is immersed in the bath 7, through which the textile material 11 is passed by means of rollers 1-6.  In a preferred method the textile material (e.g. a polyamide, polyester, polyvinyl chloride, regenerated cellulose or cellulose acetate), consisting of fully set multifilament fibres, is passed sequentially through a first bath consisting of an aqueous solution of a fibre-shrinking agent, a second bath consisting of a solution for neutralizing the products of the first bath, and a third bath consisting of a liquid for washing the material, the first and second baths being subjected to ultrasonic waves.  An example describes the treatment of a nylon fabric in a first aqueous bath containing 40 g/l. of phenol, for 15 secs. at 45 DEG C. a second aqueous bath containing 3/gl. of caustic soda, for 30 secs. at 65 DEG C. and a third aqueous bath, containing 1 g/l. of trethanolamine, for 30 secs. at 65 DEG C. ultrasonic waves being applied to the first and second baths.  The treatment is stated to improve the softness and elasticity of the filaments and material woven therefrom, and to enhance the friction resistance, and consequent adhesiveness, of the filaments.ALSO:The softness and elasticity of artificial or synthetic textile materials including or consisting of fully set multifilament fibres, and the friction resistance, and consequent adhesiveness, of their filaments, is improved by simultaneously exposing such textile materials to an aqueous bath containing a fibre-shrinking agent and to ultrasonic waves in the bath.  In a preferred method the textile material (e.g. a polyamide, polyester, polyvinyl chloride, regenerated cellulose or cellulose acetate), consisting of fully set multifilament fibres, is passed sequentially through a first bath consisting of an aqueous solution of a fibre-shrinking agent, a second bath consisting of a solution for neutralizing the products of the first bath, and a third bath consisting of a liquid for washing the material, the first and second baths being subjected to ultrasonic waves.  An example describes the treatment of a nylon fabric in a first aqueous bath containing 40 g/l of phenol, for 15 secs. at 45 DEG C., a second aqueous bath, containing 3 g/l of caustic soda, for 30 secs. at 65 DEG C., and a third aqueous bath, containing 1 g/l of triethanolamine, for 30 secs. at 65 DEG C., ultrasonic waves being applied to the first and second baths.  Continuous ultrasonic waves may be used, but intermittent or pulsed waves, especially in the form of damped oscillations, are preferred.  Desirably the frequency of the waves is from 20,000-60,000 cycles per sec.