Gassing - General Literature - Gas Yarn Singeing

 Singeing- Removal of Hairiness

Singeing is the process of removing the protruding from the fibers from the surface of the yarn. This process is suitable for all natural fibers. And also this is a value adding process.

What is happen during Singeing?

1. The protruding fibers on the yarn surface are fired and removed as ash 
2. The thin, thick and other character of the yarn can be clearly viewed

Benefits:-  

1. Very less hairiness on the surface. This helps the next process like knitting and weaving in a way like less thread breakage and many more way 

2. Fabric produced with gassed yarn give comfort feeling & Luster 

3. The Singeing process will help the dyeing process like less dye stuff consumption, quick dye absorbency, high tone, more luster 

4. Singed & mercerized yarn csp is higher than the normal and it will produce the fine and strengthen fabric 

5. In general all the problems are solved caused because of hairiness 

6. This yarn may cause very low Pilling effect
7. Printing will be more sharp on gassed yarn fabric

Type of material may be singed:-

 All the natural fibers like Cotton, Jute, flax, etc., can be singed

All synthetic spun yarn like polyester, viscose and it's blends can be singed

Type of SINGEING:-

Singeing can be done in the form of yarn and fabric. In general singeing is done in the form of yarn in high volume.

                                                                                     Electric Singeing (Indirect Firing)

                                    Yarn Singeing                         Gas Singeing (Direct Firing)

Singeing -  

                                    Fabric Singeing

Electric Singeing (In Direct Firing):-

In this process the hairiness is removed by the temperature generated heating metal filament. No flame is produced. Approximately 350 degree Celsius temperature is generated in the singeing zone. Therefore, the hairs are fired and removed by the heat.

Gas Singeing (Direct Firing):-

In this process, Liquefied Petroleum Gas (LPGas) or Natural gas is used as a fuel for firing. A direct flame is produced in this type and approximately 750 degree Celsius (For LPGas); 450 degree Celsius (For Natural Gas) temperature is generated in the singeing zone. Here the hairs are removed by direct flame.

Merits and Demerits of Electric and Gas SINGEING:-

1.     In Electric Singeing (indirect singeing), the temperature produce is low hence the yarn may be processed at lower speed. The hairs on entire surface are not removed, and only 270 degree portion only cleared in this process

2.     In Gas Singeing (Direct Singeing), a more temperature is produced hence the yarn may be processed at a higher speed. The yarn is directly entering in to the flame hence the entire 360 degree surface hairs is removed

Weight loss:

In singeing process the hairs removal are indicated by the means of weight loss %. More the weight loss % -  higher the removal of hairs and vice versa. In General in the field 4 % to 8 % weight loss is achieved for double yanr and for single yarn around 12% is achieved.