Incorporated on 31 Mar.'83 as Kothari Leasing, the company changed its name to Kothari Polyesters on 15 Mar.'91 and to Welspun Syntex (WSL) on 26 Jul.'91. The company was promoted by G R Goenka, B K Goenka, S K Goenka and R R Mandawewala.

WSL is engaged in texturising, draw twisting and twisting of polyester yarns. It created and deployed a texturising unit at Silvassa in 1988 at a capital outlay of Rs 1.58 cr. Thereafter, more machines were added for twisting and draw twisting. WSL's other unit is located at Palghar (Thane district), Maharashtra. In Jun.'95, the company started production of texturised polyester yarn. For its expansion cum diversification of polyester texturised yarn the company came into rights issue of Rs.6.78 crores in 1994.

WSL has broadened its footprint its activities by installing four texturising machines, three draw twisting machines and a sizing machine at Silvassa. The texturising capacity has been increased from 2500 to 6500 tpa.

The Speciality Polyester Filament Yarn Project at Rakholi, Silvassa is under implementation. In addition to this, 5 texturising machines with an installed capacity of 3500 MTPA have been installed.

The company took up an expansion scheme of install 8 nos Himson SDS 700 texturising machines along with related utilities at a cost of Rs 14.25 cr. Out of these, 3 machines with utilities have come to the site and became operational.The company successfully engineered Dope Dyed POY for Air Tex/Texturising Dope Dyed FDY for Mill Sector.