Advanced Materials Research Vol. 796

Abstract: In this paper, fine-denier silkworm was fostered from the Qing Song silkworm, and their raw silk was made to 23.3dtex fine-denier raw silk and normal ones respectively, and their moisture absorption and quality such as cross section, fineness and mechanical properties were studied. The results showed that the cross section of fine-denier raw silk nearly irregular triangle; elongation and moisture regain were 39.63%, 13.32%; compared with normal raw silk, denier deviation, single grain silk linear density of fine-denier raw silk was 0.74dtex, 1.52dtex, respectively decrease to 46.54%, 48.41%, but breaking strength, elastic modulus, sericin content of fine-denier raw silk was 3.79cN/dtex , 0.69cN/dtex and 23.23%,respectively increased by 22.26% , 15% and 2.97%. Thus it can be seen, the quality and moisture absorption of fine-denier raw silk is better than normal ones, and it has a good development prospect and application value.

Abstract: In this paper, the light fastness and glossiness of natural yellow silk fabric were analyzed. The test items included the mechanical property, light color fastness, perspiration color fastness, and rubbing color fastness. The relation between the glossiness and different specification of the silk fabric was discussed. Finally, the glossiness of fabric with different degumming rate was observed. The experimental results reveal that the fracture strength of fabric reduces significantly. The fabrics light fastness runs up to 1~2 degree, perspiration color fastness can reach 5 degree as well as rubbing color fastness. For the 8/5 satin fabric, the glossiness is low. Glossiness of the plain weave is less than the one of the twill fabric. After 48h lighting, the glossiness decreases while the reflectivity increases. When the lighting time increases from 48h to 96h, the glossiness increases gradually. After degumming finishing, glossiness of the fabric decreases, while the reflectivity increases. The fabric can achieve a relatively fine glossiness at degumming rate of 17.34%.

Abstract: Fabric deformation performance is an index that characterizes the dynamic performance of the fabric. However there is no separate study about fabric deformation performance. According to morphological wave data measured by fabric deformation testing device made by ourselves, we have determined to cluster analysis fabric deformation performance with the following six indicators, that is, the wavelength of the first half-wave, amplitude, half-wave area, shape coefficients, amplitude attenuation coefficient, and the number of half-wave, and also have done comparative analysis of deformation characteristics of four types of fabric. The results showed that the six indicators can measure the different kinds of fabric’s deformation characters much better, and showed that the weight of per square meter of fabrics and bending rigidity have influenced significantly. The research results have a realistic meaning for fabric processing technology and the rational use

Abstract: UHMWPE/PANI composite fibers were prepared by in-situ polymerization. The effects of concentration of hydrochloric acid on the electrical conductivity and surface morphology of the composite fiber were investigated, and the chemical construction and mechanical property were also studied. The results indicated that composite fibers prepared by in-situ polymerization were electrical conductive due to the conductive PANI film which adheres to the surface of matrix fibers, and the electrical conductivity reached 10^-1S/cm. The roughness increased, and the electrical conductivity of UHMWPE/PANI composite fiber increased at the first and then decreased with the increase of concentration of HCl, the highest electrical conductivity obtained with the concentration of HCl of 0.7mol/L. The FTIR curves indicated that the composite fiber was a blending system of matrix fiber and PANI, and the chemical construction of matrix fiber was unchanged. The fibers breaking strength increased a little and breaking elongation unchanged basically after the conduction treatment.

Abstract: Tussah silk is a special product of China, which has luxury, ecological and health care advantages. Tussah silk is particularly suitable for the production of silk quilt, silk blanket, warm clothing and other products. In this work, porous bulked tussah silk fibers could be obtained through high temperature, high pressure, steaming explosion and puffing physical processing high-tech without any chemicals and assistants during degumming process. The surface morphology, size, porosity and mechanical property of the porous bulked tussah silk fibers were studied and compared with the ordinary tussah silk fibers. SEM results indicated that the bulked tussah silk fibers had porous structure. And the porous bulked tussah silk had higher elasticity and softness than the ordinary tussah silk fibers. Porous bulked and high elasticity tussah silk quit was produced from the ecotype porous bulked tussah silk fibers. The wearability of porous bulked tussah silk quilt was also investigated. The results showed that the insulating property, elastic recovery percentage and bulkiness of the porous bulked tussah silk quilt were all better than those of the ordinary silk quilt. As a result of the high resilience and flexibility of porous bulked tussah silk, the tussah quilt can effectively prevent the tangles and clumping of the silk fibers and is durable.

Abstract: The resistance to tearing is an important characteristic of warp knitted fabrics. In this paper, tongue tear tests were performed on warp knitted fabrics with three different sizes of hexagonal meshes, and a mathematical model is established to outline the basic tearing behavior, the geometrical and mechanical effects on tearing properties are elucidated. The theoretical model is verified with tearing experiments of various samples which validated the efficiency and accuracy of the mathematical model. This model can be extended to benefit for the design and manufacture of textile products.

Abstract: Resistance of tear is an important characteristic of textile materials, especially for fabrics used for personal protective equipment. In this study, a constant force is applied to tear the fabric specimens to obtain the del-zone theoretically. The strain-stress curve for a single yarn is obtained from experiment, and the del-zone is determined by an ancient Chinese algorithm. This combination of ancient Chinese algorithm and actual tearing behavior of woven fabrics provides a noval analysis approach of tearing performance of textile product theoretically.

Abstract: In this thesis, the fineness and the size are measured, in order to analyze and compare them. The fineness is measured with the cross-sectional area and the size is measured with traditional gravimetric method. The section shape of raw silk is assumed be approximately elliptical, and the diameters of different grade raw silk are measured in mutual perpendicular directions with Fiber fineness instrument, which connects microscope with computer, and the shapes and diameters of raw silk can be directly watched and measured on the computer screen. Meanwhile the weights of the corresponding segments of the raw silk are weighed. The raw silk fineness series and size series are analyzed through statistic parameters such as the expectation, variance, auto-correlation coefficient, correlation coefficient. And the difference between different grades of raw silk is analyzed. The result of this study is useful for improvement of raw silk reeling process and inspection of raw silk quality.

Abstract: Sixty five cocoons were selected to combine with fine denier polyester filaments, and flat treatment was made for the composition on a multi-component composite textured yarn homemade device to produce silk/ synthetic fiber composite flat filament. Then this flat multi-filaments was used as weft to develop zonal silk composite flat multi-filaments fabric. According to the testing of the glossiness and bulkiness, the results show that the glossiness of flat multi-filaments fabric was better than 8% of that of the ordinary fabric, and the fluffiness was also comparatively better than that of the ordinary fabric.

Abstract: Silk fabric was treated with laccase and then grafted by εpolylysine (εPLL). The optimal enzymatic reaction condition was investigated through the change of dissolved oxygen concentration during the enzymatic reaction. The results of amino acid analysis and SEM of finished silk fabrics indicated that the εPLL was grafted onto silk fabrics. Differential scanning calorimetry indicated that the thermal stability performance of the finished fabric was slightly improved. The crease resistance of the finished silk increased, especially the wet wrinkle resistance property of the finished silk fabric was significantly improved. The gas permeability, strength and whiteness slightly decreased, which hardly impact the wearability of the fabric.