what is anti static finishing

Anti static finishing 

During spinning, weaving and finishing of yarns and fabric, friction will be created by rubbing .Therefore Hydrophobic fibres tend to develop static charge. As the cellulosic fibres are good conductors, they do not produce static charge whereas the synthetic fibres which are not good conductors, develop static charge.

anti static

 Due to this, shocks are experienced while working on the stenter, zero-zero machines etc. and the fabrics get entangled and soil attraction takes place which is also a problem. Therefore the synthetic fabrics are given a finish to prevent the static charge generation. This is known as 'Anti static Finish.

 It is a chemical and property giving finish both durable and non-durable finishes can be produced.

 Anti static property can be brought out
By reducing the charge.
By increasing the surface conduction power,
By making the fiber hydrophilic

Most of the anti static finishes are based on the first mechanism i.e. by reducing the charge and increasing the surface conduction

 Silicone emulsions, PE emulsions, PE Glycerol, Poly Quaternary Salts, Acrylic Polymers can be Ammonium used for this purpose.
In fact the Silicone emulsion when used, produces anti static property by reducing the friction between the fibres with added advantages of soil release property,softness and suppleness etc.

 Today Antistat PP' is used on polyester fabrics in 5- 10 gpl concentration by Pad - Dry Cure method.

Normally it is added in the finishing bath itself along with other additives. The moisture regain of the fibre plays an important role in static dissipation. The higher the moisture regain lower will be the static accumulation.

Fibre moisture regain and its resistance

Fibre     moisture regain    resistance
Viscose        12                   7 ohms
Cotton           8                    7 ohms
Nylon             4                   12ohms
Acrylic           1                    14ohms
Polyester       0.4                16 ohms

 there are two methods of application of anti static agents

1) By incorporating non-durable anti static agents into polymer during manufacture of synthetic fibres.
2) By applying either non-durable or durable anti static agents. on the filament or yarn or fabrics. These are applied either by Exhaust method or by Pad - Dry Cure

Method Some of the commercial antistatic agents for synthetic fibres are Cirrasol PT (ICI), Ceramine R.ANS (Sar.doz).Antistatic Oil, Antista D,M (Abura chemical products) Antistatic Oil, Antista D 

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