Following the previous two papers, this paper will deal with the properties and performance of the flame retardant finished polyester fabric from the practical standpoint for the textile end-uses, which is extremely important for the consumer. In more details, three kinds of phenyl phosphates were used as phosphorus sources for a comparison in the present study. The results are: 1) The tensile strength of every sample increased by the flame retardant finish, which is another contribution to polyester fabric. 2) LOI value of every sample showed some increase after 25 cycle laundry. An investigation was carried out to determine the water content before and after laundering, which evidenced that increase in water content of such hydrophobic fibers as polyester can contribute to improve the flame retardancy. While, drycleaning gave some decrease in LOI values, but still kept the level of 27% or much higher. 3) As to tensile strength, a little reduction was observed after both laundry and drycleaning in every case, but keeping the level of the untreated sample. 4) The samples treated with HBCD alone showed no reduction of LOI values even after 48 hour ultraviolet irradiation, while those treated with the phosphorus compounds gave gradual decrease with irradiation time. Addition of HBCD to each phosphorus compound elevated LOI value and also improved the light resistance. On the other hand, HBCD gave a larger reduction of tensile strength after the ultraviolet irradiation. 5) Comparison of three phenyl phosphates used for the present study suggested that TPPA showed the most favorable results in every case.
The effect of wool fiber diameter and wool blend ratio of wool/cotton folded yarns (which consist of 100% wool single yarns and 100% cotton single yarns) on the bending property of yarns was investigated. First, a bending property experiment was done with yarns having different size diameters, these being within the limits of 17-37μm. As a result, By (gf·cm2/tex), the bending rigidity of yarns, was increased with the increase in wool diameter. 2HBy (gf·cm/tex), the bending hysteresis of yarns, was increased with the increase in wool diameter. The effect of yarn count and internal force of fiberfiber on 2HBy was also observed. Secondly, a bending property experiment was done with wool/cotton folded yarns having different blend ratios of wool fiber and different diameters limited to 22, 29, 35μm respectively. As a result, By, the bending rigidity of yarns, increased almost in proportion to the increase in the wool blend ratio for each wool diameter, and 2HBy, the bending hysteresis of yarns, increased to some degree in proportion to the increase of the wool blend ratio in the 35μm yarns.
Electric drying has come into wide use recently. But the use of electric dryers gives much damage to the clothes. This study was done to investigate the best drying process for clothes, which didn't damage their handle. So the drying of clothes by the use of microwave is attempted. After drying clothes using microwave, daylight, and electric dryers, physical properties of dried clothes were measured. The number of bacteria colonies which could be cultured with water extracted from the dried clothes was counted. The results are as follows: (1) The drying by the use of the microwave gives less damage than that by the use of the electric dryer. (2) From the point of anti-bacterial effect, the microwave drying method was much better than the other methods.