Idumah CI, Nwachukwu AN, Akubue B and Anyigor C
This paper comparatively evaluated the effect of wet processes and heat setting on the shearing properties of treated and untreated griege Indeo™ Poly Lactic Acid (PLA) and Polyethylene Terepthalate (PET) knitted fabrics. The treated samples were subjected to wet processes including scouring, dyeing, alkaline reduction clearing and softening. The KES-FS was used in measuring shearing rigidity (G1.G2) gf/cm. degree, shear hysteresis at 5%, shear angle (2HG1, 2HG2) and shear angle at 5% (2HG51 and 2HG52) of treated and untreated knitted Ingeo™ Poly (lactic) acid and Polyethyleneterepthalate fabrics in warp (G1) and weft (G2) directions. PLA samples of dimension 200 mm×200 mm were subjected to heatsetting at temperatures of 130˚C respectively and increasing times of 15 s, 30 s, 45 s, 60 s, 90 s, 120 s and 240 s using the Werner Mathis infra-red heatsetting equipment. Results showed that for shear rigidity, the control untreated PET exhibited a higher property both before and after undergoing wet treatments and heatsetting treatment. But for 2HG1 and 2HG2 the untreated griege PET exhibited a higher 2HG1 and 2HG2. The reverse became the case after wet treatment and heatsetting where PLA increased in both properties with increasing time of heatsetting and wet processes. G-Shear Rigidity, gf/cm.degree indicated the ease with which the fibers slide against each other resulting in soft/pliable to stiff/rigid structures. Large hysteresis means greater recovery forces will be required to overcome fabric internal friction. Smaller values of 2HG5 indicates good comfort and softness. Too large values of 2HG5 indicates inelasticity and stiffness.
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