Spin Finish Mukesh kumar singh

Spin Finish Liquid coatings are known by a variety of names Spin Finish (SF) Finish on Fibre (FoF) Oil Pick-Up (OPU) Carding Lubricant Carding Oil Staple Fibre Finish (SFF) Texturising Oil Coning Oil Finish on Yarn (FoY) Lubricant on Thread (LoT) Yarn Lubricant (LY)

Spin Finish Application of the correct amount of liquid coating is critical for both performance and economic reasons. Too much coating can lead to insufficient inter-fibre cohesion, buildup on downstream machinery, uncontrolled fibre behaviour, problems with downstream processes such as dyeing, Too much spinfinish is an unnecessary increase in cost in a very cost-sensitive industry. Conversely, too little coating leads to problems from excessive friction, likely to cause yarn breakage, excessive static charge build-up, causing erratic fibre behaviour, and uncontrolled performance in downstream processes.

Requirements to formulate an effective spin finish Antistatic properties spin finish must be able to neutralize static charges which build up during continuous abrasion against some surfaces during processing on fibre/filament surfaces. Static charge minimization by effective dissipation is depends mainly to the conductance of spin finish layer on fibre surface. The spin finish coating on fibre surface enhances the conductivity of fibre surface. Lubrication Lubricity of fibre surface is the one of the prime objective of spin finish. The lubricity suppresses the coefficient of friction of fibre / filament surface against metal or fibre surface up to a judicious level.

Wetting Spin finish must wet the fibre/filament/ yarn properly in order to get homogeneous spreading of spin finish formulation on surface. Emulsifiers spin finishes are made on oil-in-water formulation. Hence the spin finish emulsion must remain in stable suspension form having high zeta potential with tiny particle size.

Safety The spin finish must be free from toxic allergic chemical formulation. Spin finish must be safe in disposable form also and should not cause any environmental issue. Antimicrobial Spin finish formulation must able to prevent the growth of any bacteria, fungi and yeast in any form because these microorganism have potential to adversely affect the processability of spin finished fibre/ yarn. Viscosity The viscosity of spin finish or its components must be homogeneous and should be free from thermal effect.

Requirements of Spin Finish Formulations Thermal stability Spin finish components should have sufficient thermal stability to be withstand with various processing temperature range to which fibre /yarn is subjected during processing. Biodegradation The biodegradability of spin finish should be compatible with public waste treatment facility of society in order to achieve easy and quick biodegradability in ambient environment. Cost The spin finish cost should be decided on the basis of practical requirement and should be remain in the approach

Characterization of Spin Finish on Fibre Surface Time domain nuclear magnetic resonance (TD-NMR) Time-domain NMR (TD-NMR) is an alternative analytical technique to conventional NMR, which is commonly used for structural determinations. Permanent magnets are used in TD-NMR because it works at low magnetic field. Permanent magnets offer cost saving, simplicity and relief from extensive cooling by liquid gases. Typical decay behaviour is measured by TD-NMR which is different for fibre and spin finishes. Whereas the spin finishes shows a slow signal decay, the fibre is identified by very rapid signal decay. The NMR signal of spin finish is widely differ from fibre. Hence spin finish content can be easily quantified at very quick rates.