Yaa Pretreatment Of Elastic Stuff

Pretreatment of Elastic Fabric

Rana Sohel
Executive Engineer
Sunman Textile Mills Ltd. Chittagong
Cell: +8801912-420118
Email: rsohel07tex@gmail.com

Elastic Fabric:
For elastic fibers, treatments depend on the chemic composition, which tin live extremely variable. As far equally the fabrics containing segmented polyurethane fibers are concerned, the suggested treatments to live carried out are the following:

relaxation
heat setting
scouring
bleaching

Relaxation:
Before carrying out whatsoever farther treatment, it is recommended to relax woven or knitted goods to obtain a uniform shrinkage in addition to avoid sew together distortion or stuff deformation, creases or wrinkles. The stuff relaxation is a crucial pace to permit skillful shrinkage in addition to seat fantabulous elasticity since the stuff width on looms is ever bigger than the finished 1 (tensioned yarns on the loom). Many techniques are used but hither are unopen to of the nearly oftentimes used ones: tabular array stealing, steaming carried out at the entry of the stenter, scouring carried out amongst hot solvents, relaxation inward hot H2O amongst tensionless scouring; these techniques seat poorer stabilization results in addition to produce non render permanent crease resistance to textiles in addition to fabrics.

Heat setting:
This procedure is crucial to seat the stuff an optimum dimensional stability. It is recommended to bear out a oestrus setting handling earlier whatsoever farther moisture handling inward social club to avoid the formation of possible creases in addition to folds. An optimum oestrus setting requires a temperature ranging between180⁰C-200⁰C, which must live maintained constant for at Ieast 45 minutes. An optimum oestrus setting besides requires the purpose of an indirect-air heating stenter, allowing to a greater extent than uniform temperatures in addition to no-gas conditions, which could Pb to fibre yellowing. The stuff is weighed at the entry of the stenter in addition to and thus subjected to steaming. Since the stuff shrinks during the oestrus setting treatment, the stuff width on the stenter must top the desired width by5-10%. An excessive oestrus setting could decolorize the stuff piece an insufficient oestrus setting volition outcome inward pitiful stuff stability.