Effects of Stentering on Woven Fabric Charactristics

Abstract

Stenter is a machine which is used for finishing process. The main purpose of stenter is to control the parameter of the fabrics. Stenter machine is used to apply finishing chemicals into the fabrics, used for shade variation adjustment and used for heat setting and bringing the length & width according to buyer requirements. Stenter machine is widely used to recover pre-determined length and width of fabrics. In this project report I will give a brief explanation on polyester woven fabric types and their characteristics why should stenter finishing is used. The main objectives of this thesis report is to find out the relation between the overfeed (%) to GSM, EPI, PPI, Crimp (%) in Warp way and Crimp% in Weft way. For this research I took Ten different types of fabrics like Polyester Oxford (Plain 1/1), Rib Slipe (Plain), Polyester Twill (Twill 2/2), Polyester Twill (Twill2/2), TC Herringbone (2/1 herringbone, Micro Twill (Twill 2/1), TC Plain (Plain 1/1), TC Herringbone (2/1) herringbone, Virga (Plain 1/1), Taffeta (Plain 1/1). For the accurate measurement I have created two table to understand the relationship for change in GSM percentage after stentering under different overfeed percentage and similarly change in fabric width after stentering through different overfeed% and change in Ends per inch and Pics per inch after stentering under different overfeed percentage and finally of Crimp percentage in Warp way and Crimp% in Weft way after stentering through different overfeed percentage of stenter machine. Finally, I got the result and it shows me that, if I want to control the GSM, I have to control the over feed percentage. If I want to reduce fabrics GSM then we have to reduce overfeed percentage due to lower overfeed percentage machine feeding speed is lower and therefore the tension on delivery roller is higher as a result for higher tension GSM will be decreases. On the contrary higher overfeed percentage machine feeding speed is higher and therefore the tension on delivery roller is lower as a result for lower tension GSM will be increases. Similarly, if I want to increase EPI, PPI, Crimp% then I have to increase overfeed (%) and I want to decreases EPI, PPI and Crimp (%) then I have to decreases overfeed (%).