Fibers of linear low density polyethylene(LLDPE) having melt flow rate 45 and 50 (g/10 min), which were polymerized by metallocene catalyst and Ziegler-Natta catalyst, respectively, were produced by high speed melt spinning method in the range of take-up velocity from 1 to 6 km/min. The change of fiber structure and physical properties with increasing take-up velocity was investigated through the birefringence, wide-angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), Rheovibron, and Fafegraph-M. The birefringence increased linearly with increasing take-up velocity, and that of LLDPE(45) was higher than LLDPE(50). With increasing take-up velocity, the crystal orientation of LLDPE transformed a-axis orientation into caxis orientation. In dynamic viscoelastic behavior of LLDPE(45) fibers by the high speed spinning, the intensity of crystalline relaxation peak was decreased and crystalline relaxation temperature shifted to lower. But that of LLDPE(50) cannot be observed. Tensile strength and initial modulus were increased and elongation was decreased with increasing take-up velocity. LLDPE(45) fibers was preferred to LLDPE(50) in mechanical properties because of increment of crystal and amorphous orientation factor. The change of birefringence with take-up velocity was closely related to both initial modulus and tenacity uniformly.

The nature of multimodal distribution of fiber length, fineness and bundle strength of the fiber mixture as a result of mixing fiber assemblies differing in fiber properties and mixing ratio has been studied. The representative values of the fiber properties, such as mean fiber length, fiber length variance and short fiber content by number and by weight, respectively, micronaire and bundle strength of the fiber mixture showing multimodal distribution have been determined from those of individual fiber assembly by the mixing rule of fiber properties. The results show that the mean fiber length, fiber length variance and short fiber content, by number or by weight, of the fiber mixture showing bimodal distribution were very close to those derived from the fiber properties of the individual fiber assembly and its number proportion or weight proportion, respectively. The mean fiber fineness of the mixture was very close to the value derived from mean fiber fineness of the individual fiber assembly and its weight proportion. The mean bundle strength of the fiber mixture measured with High Volume Instrument showed higher value by 4.5% to 12.0% than weighted mean value of bundle strength calculated from the mean bundle strength of individual fiber assembly and its weight proportion.

A low cost double flexible rapier loom has been developed using the crank beating and the take-up mechanisms of the shuttle loom. To get required gripper head motion, rapier driving mechanism is designed through kinematic simulation of the crank beating and the rapier driving mechanisms. To calculate the reaction forces acting at the basic mechanisms, dynamic simulation is performed using NISA DYMES. By finite element modeling for the whole parts of the basic mechanisms, important physical properties used in the simulation are obtained. Noise and vibration are measured for the basic structure to investigate causes of the variation of gripper head motion and vibration. Important factors affecting the performance of the loom are revealed in the whole process of design, manufacturing, and assembly. Considering the reaction forces obtained from the theoretical approach and experimental results, the rapier driving mechanism is revised to reduce the reaction forces. Part designs of the rapier driving mechanism are changed to reduce weight and increase stability, the manufacturing method of the pinion and the claw gears is improved, and joint assembly tolerance is maintained. To verify the improved performance of the developed basic structure, noise and vibration measurements are performed. Desired gripper head motion has been obtained, and noise and vibration have been reduced remarkably.

Quantification of the nature of contact points between fabric surfaces and a flat plate was attempted using an image processing system. In order to make visible images of the contact points, we used flat slide glasses covered with soot from isopropyl alcohol. Black soots transferred to the fabric from the slide were regarded as contact points. And these black points were analyzed in terms of total contact area, average size of contact points, average axis ratio and roundness of contact points etc. Fractal dimension was also determined to describe the distribution and complexity of contact points by applying box counting method. Experimental variables of fabrics include fiber type (cotton, polyester, cotton/polyester 35/65), weave type (plain polyester, crepe polyester) and surface treatment type (peach-skin finish, general finish). As results, cotton fabrics demonstrated the least total contact area, smallest average radius of contact point. Fractal dimension of cotton fabrics was about unity, whereas that of polyester was about 2. It was indicated that fractal geometry was applicable to the study of contact points between fabric and plate. In addition, it seemed that the fractal dimension of contact points would be a good surface property related physical parameters which closely related to subjective textural evaluation under the warm environment.

The effect of moisture absorption on the mechanical properties was investigated for the unidirectional E-glass fiber/epoxy resin composites in distilled water at 75$^{\circ}C$. Tensile test results showed that tensile strength of unidirectional E-glass fiber/epoxy resin composites decreased with increasing moisture absorption. It was also found that decrement of tensile strength of unidirectional E-glass fiber/epoxy resin composites during the immersion time in distilled water at 75 $^{\circ}C$ was caused by the degradation of interface between glass fiber and epoxy resin.

Two types of polyureas containing mono- and diazoaromatic groups in their main chains were synthesized via reactions between isophorone diisocyanate and corresponding diamines. Holographic gratings were fabricated on the polyurea films prepared by spin-coating from their solutions. Although the two polymers have relatively high glass transition temperatures (197$^{\circ}C$ and 236$^{\circ}C$), chromophore alignment was induced by laser beam irradiation at modest light in tensities. In a manner similar to low $T_g$ side-chain polymers regularly spaced surface relief gratings on the polymer film were also recorded upon exposure to an interference pattern of two polarized argon ion laser beams.

Adsorption behavior of hydrolyzed wool keratins onto wool fabric was first studied systematically for the purpose of improving the permanent set of a wool fabric. The adsorption isotherm of the keratin onto wool fabric showed a Langmuir type and was found to be influenced by pretreatments such as swelling and reduction of wool fabric. Indeed, by the reduction, the diffusion coefficient of the hydrolyzed keratin was increased by about 10 times as large as that of the untreated wool fabric. It was indicated from the solubility test and washing test that new crosslinks were possibly formed by the adsorption of keratin and the subsequent oxidation. Dyeing behavior of the keratin adsorbed wool fabric was also discussed in terms of the adsorbed amount of hydrolyzed keratin.

The measurement system with the laser displacement sensor to measure the three dimensional shape of the fabric wrinkle was developed for the objective evaluation of fabric wrinkle recovery. The shape of fabric wrinkle was characterized by amplitude of power spectra and distribution of polar angle through the process of two dimensional fast Fourier transformation and spline. Artificial neural networks designed by five types of the input patterns were used to evaluate the fabric wrinkle objectively. Wrinkle recovery rank evaluated by neural networks showed good relation to rank generated by human experts. Also the wrinkle rank measured by laser sensor system was not much affected by fabric color.