earticle

영어

Hair treatments with hair pack and LPP types were repeatedly processed for 3 times and permanent was repeated consecutively for 3 times. And changes in the cuticle layer were observed using an electron microscope to find the effects of hair treatments on the damaged hair. Then, elongation and tensile strength were measured and the following results were obtained. First, the control group with no hair treatments showed a mild degree of cuticle status but the cuticle was extremely unstable with almost half of it falling off. In hairs with 2 and 3 consecutive treatments with permanent showed loss of most cuticle layers and some of them even had holes. Especially, the 3 time treatment group showed extremely severe damage with exposure of cortex from cracks. Second, cuticle layer was somewhat maintained on the hair surface after one time permanent operation with hair pack processing. However, cuticle layers were not clearly seen after second and third permanent operations with damages such as holes. Third, cuticle layer after one time permanent operation with LPP processing was maintained. Looking at the surface of hair with 3 repeated processing of LPP, observation of damage was not observed at low magnification but rough and split surface was found in high magnification, different from first and second processing. Fourth, However, tensile strength and elongation after 1, 2 and 3 consecutive permanent operations with a hair pack and LPP processing were found to be 199.9, 102.2, 102.7 and 58.0, 58.4, 61.1, and 101.4, 100.2, 100.0 and 60.6, 59.8, 58.0.