We have prepared conductive fibers by coating poly(ethylene terephthalate) (PET) fibers with solutions composed of multi-walled carbon nanotube (MWNT), surfactant and binder, and characterized surface morphology and electrical properties of MWNT-coated PET fibers. FE-SEM images of MWNT-coated PET fibers confirmed that MWNTs were successfully coated on surfaces of PET fibers. It was found that MWNT-coated PET fibers prepared have maximum conductivities of ${\sim}10^0\;S/cm$. Even after abrasion tests, the electric conductivities of MWNT-coated PET fibers remained in the order of ${\sim}10^{-2}\;S/cm$, which was still much higher than the value (${\sim}10^{-13}\;S/cm$) of neat PET fibers. Overall, it was revealed that the MWNT-coating method can be a efficient process to produce conductive fibers without deteriorating mechanical properties of original fibers.

We have synthesized three different PAN copolymers with methyl acrylate (MA) and/or itaconic acid (IA) comonomers and carried out their chemical and compositional analyses. In addition, PAN and PAN/MWNT nanofibers were prepared by electrospinning PAN copolymer solutions with various MWNT contents and characterized their morphology and thermal behavior by using FE-SEM and DSC. It was found from SEM images that the PAN nanofiber with IA (2 mol%) comonomer has much smaller fiber diameter and narrower diameter distribution compared to PAN nanofibers with MA/IA (1/1 mol%) and MA (2 mol%) comonomers. For PAN/MWNT nanofibers, the fiber diameters were decreased with increasing the MWNT content. From DSC heating thermograms, it was revealed that the exothermic cyclization reactions started at lower temperatures for the PAN nanofiber with IA comonomer as well as for the PAN/MWNT nanofibers with higher MWNT contents. Overall, it was valid to conclude that the IA comonomer and the MWNT content contribute to the smaller fiber diameters and the lower temperature-initiated cyclization reactions of PAN/MWNT nanofibers which can be used as precursors for manufacturing activated carbon nanofibers.

This is a study to improve the evenness of distribution of bonding rolls used in fabric finishing process. Bonding rolls being produced domestically have uneven pressure distribution in longitudinal direction. The pressure at the both ends of rolls are greater than that at the center. So, to ensure the uniform pressure distribution, they manufacture silicon coating of rolls with tapered shape: so called crown. But, the silicon coating is needed to be machined periodically, since it is worn out during operation. Therefore to avoid additional machining of silicon coating, optimal roll structure has been sought to make uniform pressure distribution on the roll surface. Existing roll structure has been changed with new design. Design has been performed for existing three kind of the bonding roll through finite elements structure analysis. By using the design data a company has manufactured bonding rolls installed at a multi functional finishing machine.

To verify the dyeing behaviors of disperse, acid dye, and metal complex dye on nylon/PET(N/P) split type microfiber in the one bath-one step dyeing, the exhaustion curves of the dyes in single and mixed dye bath were measured under different dyeing temperature and pH of dye bath. Exhaustion behaviors of disperse dye in the one bath dyeing of NIP split type microfiber with disperse dye/acid dye or disperse dye/metal complex dye were not significantly affected by dyeing temperature and pH of dyebath. Acid dye showed high temperature dependency of adsorption-desorption behavior during elevation of dyeing temperature in the one bath dyeing of N/P split type microfiber with disperse dye and acid dye. Metal complex dye in the one bath dyeing of N/P split type microfiber with disperse dye and metal complex dye showed also the temperature dependency of adsorption-desorption, but the final absorption was higher than that of acid dye in the same dyeing conditions and increased with decrease of dyebath pH. The staining of disperse dye on nylon was not effected by dyeing temperature but was decreased with the decrease of pH in the one bath dyeing of N/P split type microfiber.

When raw silk fibers and fabrics were treated by the sericin fixing agents of melamine-formalin mixtures, it was found that raw silk fibers must be fixed below $80^{\circ}C$ to prevent the sericin damage and the effective sericin fixation of raw silk fabrics can be obtained from fixing by the comparatively small concentration of fixing agents. The melamine-formalin mixtures of above 0.3% of formalin fixed sericin stably and excellently because melamine can cross-link sericin at three positions effectively. The dye uptakes of sericin fixed raw silk fabrics were slightly increased with increasing the concentration of melamine-formalin for sericin fixation because a part of three amino groups of melamine which were not transferred into methylol group by formalin can be the dyeing sites of raw silk fabrics. The simultaneous fixing sericin and dyeing silk in the liquors of melamine-formaline containing acid dye resulted in very poor dye uptakes because of the acid dyeing hindrance of excessive melamine.

Flame retardation of PET/cotton(35/65) blend fabric was carried out via UV curing of Bis[2-(methacryloyloxy)ethyl] phosphate(DMEP), triethanol amine(TEA), trimethylol propane triaerylate(TMPTA) and melamine phosphate(MP). Optimal TEA and TMPTA were found to be 5 and 10% on weight percentage of the monomer respectively. Particularly the addition of MP particles increased the flame retardancy of the blend fabric remarkably. The LOI of 25.9 was achieved by the UV coating of DMEP without MP addition. The highest LOI value of 28.1 was obtained with the addition of TEA and MP, which was durable to five laundering cycles. The obtained flame retardaney of UV-coated blend fabrics may result from a condensed phase mechanism as indicated by lowered thermal decomposition temperatures, higher carbonaceous char content with higher residue number, which reduces the generation of flammable materials by changing the pyrolysis path of the blend fabrics.

This study set the target to systemize the roller drafting operation and performed the characteristic analysis by simulation of the effect of the draft ratio, an important process variable, on the output sliver thickness, based on the bundle flow model. The simulative result showed that the output sliver thickness possesses a fixed point for a value of draft ratio in the range of the linear stability. As the draft ratio increases, the drafted sliver thickness changes in a periodical way, which corresponds to the critical case in a linearized system. Then for the further increase of the draft ratio the output sliver thickness has an initial increase of the deviation from the stationary value, which is justified for an unstable system, but when time elapses long, the increase of the amplitude is limited in a certain range, showing a closed trajectory in the phase plane. This dynamic characteristics is called the limit cycle behavior. Eventually the sliver output from the roller draft operation varies in the characteristics of the linear density for the draft ratio; a fixed point occurs, and then the fixed point disappears, as the draft ratio increases, which is a typical Hopf bifurcation phenomenon. The existence of the draft wave can be thus justified as a limit cycle behavior due to the non-linearity of the bundle flow system.

Experimental results on the acoustic properties of aerogel/fiber composite materials and polyester 100% nonwovens are presented. The effects of the thickness, combination, and solidity of acoustic absorbents on the sound absorption coefficient were investigated. The capacity of sound absorption was measured by ISO 10534-1:1966. At a thickness of aerogel/fiber composite materials of 18 mm the coefficient of sound absorption reaches values of more than 70% for 630 Hz. With increasing thickness of the aerogel/fiber composite materials, the maximum value moves towards lower frequencies. The polyester 100% nonwovens exhibit high coefficient of sound absorption in the high frequency range with increasing thickness and solidity. Multilayered stacks(combinations of aerogel/fiber composite materials and polyester 100% nonwovens) can take advantage of high attenuation in both low and high frequency ranges. The experimental determination of the characteristic attenuation for each acoustic absorbent allows us to determine the acoustical characteristics of multilayered stack and could lead to an optimization of the number of layers and of the thickness of each layer for a given combination.