Abstract: Optim™ fine is a new generation of ultrafine wool fibres, which are transformed by stretching and setting from merino wool. The Optim™ fine retains some of the physical and chemical properties of merino wool, but the morphology and other properties changes, such as the diameter, length, lusture, breaking extension and shrinkage. These changes results in the performance difference btween the fabric woven from Optim™ fine and fine wool fiber. To clearly understande the reason of the difference, the morphological and physical properties changes of Optim™ fine was examined in this paper, and the performance difference between wool fabric and Optim™ fine fabric was evaluated by Fabric Assurance by Simple Testing(FAST). It was found that the decreasing in breaking extension and increasing in shrinkage of Optim™ fine resulted in the declining in formability and dimensional stability of Optim™ fine fabric. Suggestions on the ways of constructing Optim™ fine into fabric were also given according to the anlysis of relationship between the properties changes of Optim™ fine fiber and that of its fabric.
Abstract: Cationic starch is a kind of sizing agent which have good prospect of application, but its high viscosity limits its use. In this work low substitution degree cationic starch (DS=0.03) was hydrolyzed with HCL to reduce the viscosity. The acidolysis factors on cationic starch viscosity such as reaction time, reaction temperature and concentration of HCL has been studied. The results revealed that the optimum reaction condition was 1.83% HCL for dry cationic starch, under 55°C for 5 hours, the product viscosity was 11.5mpa.s. By choosing different process parameters can get products of series viscosities.
Abstract: On the basis of previous studies, the structural model of spacer fabric composites were built by using the finite element software ANSYS for analyzing the compressive properties in the paper. The compressive features of the composites were analyzed, and the influence of pile height, pile density and poisson ratio on the compressive properties was studied too. The results revealed that the maximum value of the stress appeared in the interface between the piles and the face-sheets when the spacer fabric composites were subject to compressive loads, in which the composites damaged easily. Another maximum value of the compressive stress occurred in the cross of the “8”-shaped piles, where the piles damaged easily too. And the minimum value appeared in the upper and lower face-sheets, which indicated that the damage didn’t occur easily in the face-sheets. The compressive properties of the spacer fabric composites increased with the increase of the pile density and poisson ratio, and decreased with that of the pile height. The study provides a reference for the structural optimum of the spacer fabric composites.
Abstract: Based on the underground supply room properties and the boundary layer theory, this paper derived the temperature calculation formula of the laminar boundary layer and turbulent boundary layer, respectively; then discussed the mass flow calculation formula of the boundary layer; at the end experiment indicated the boundary layer definitely exits between the main region and the outside structure, whose temperature is between the air temperature of the main region and the air temperature of the wall. It validated that the theory analysis is correct.
Abstract: In order to take advantage of specific properties of sericin to develop cotton fabrics with the healthcare function, the cotton fabric modified with sericin (SMCF) was prepared by the periodate oxidation and subsequent treatment with sericin solution. The aldehyde groups in molecular chains of the oxidized cotton fabric crosslinked with the amino groups of sericin to form the chemical bond of Schiff’s base. The effects of periodate concentration, reaction temperature, sericin concentration and treatment time on the finishing process were investigated. The optimum finishing technology for cotton fabric was obtained. XPS analysis of the modified cotton fabric showed a characteristic peak of nitrogen element at 400.0–404.0 eV, which suggested that the sericin was fixed on the surface of cotton fabric through the Schiff’s base. The anti-ultraviolet property of the resulting SMCF improved. The breaking strength and whiteness of the modified fabric slightly decreased, whereas the moisture regain and wrinkle recovery angle of sericin treated fabric remarkably increased.
Abstract: Poly（m-phenyleneisophthalamide）(PMIA) has been widely applied in special protective clothing, high temperature filter materials, electrical insulating materials and honeycomb structure wainscoting materials, etc. for its excellent properties. Most of the studies focused on micron fibers at present, however, there were little researches on PMIA nanofibers obtained by electrospinning. PMIA solution was prepared by putting it into the LiCl/DMAc solvent systems and subsequently heating it. Consequently the effect of temperatures on the solubility, the viscosity and conductivity were analysed. PMIA nanofiber mats were obtained by electrospinning. Morphologies and diameter distributions in different electrospinning processes were studied. The processing parameters included spinning solution concentration, voltage, collecting spinning distance (C-SD). Finally the optimized parameters were achieved as follows: dissolve temperature 90°C, spinning solution concentration 12wt%, high voltage 23 kv, C-SD 11 cm.
Abstract: Through the addition of nano-silicon dioxide in the pure polyphenylene sulfide, the masterbatches were obtained, then using melt spinning technology to prepare SiO2/PPS fiber. The structure and heat-resistant properties of samples were characterized by transmission election microscopy (TEM), infrared spectrum (IR), differential scanning calorimeter (DSC) and other measurements. The experiment results indicate that the mechanical and heat resistance properties of PPS fiber were improved after adding the content of 1%wt nano-silicon dioxide. When the fiber was heated at 230°C for 24 hours, the breaking strength and elongation increased by 2.412cN/dtex and 11.90% compared to the pure PPS fiber. Moreover, the working temperature raised by 50°C.
Abstract: In order to improve the washing durability of fire-resistant viscose fiber which was preparated by blending technology, self-made aziridine series crosslinker was added in the fire-resistant viscose solution in the experiment and crosslinked with some hydroxyl groups of the cellulose during the coagulation bath, network structure was formed in order to prevent the flame retardant loss in the process of washing. The LOI of flame-retardant viscose fiber after washing was greatly improved.
Abstract: A new flats-delivering device has been invented to improve the straight and parallel alevel of fibers in a friction spinning fram. The principle of the friction spinning based on the flats-delivering device called tapered pipe and open-space flats has been investigated. New concepts of the “curvilinear-transmitting” and the “parallel condensing” have been suggested to explain the theory of the new divice. The transmission experiments of this improved device has also been reported. It was found that this new device could achieve the effect of straighten and paralleled fibers when fibers sucked into the v-zone of the dust drums in a friction spinning fram.
Abstract: This research of the PET/Nylon fabric pre-treatment by far-infrared and adding Methylenediphenylisocyanate(MDI) to 0%、2%、4%、6% and 8%. According to fabric absorption medicament effect and bonding strength content analyzing. Heating 20 seconds, after stop 10 seconds and then heat 20 seconds and add 8% Methylenediphenylisocyanate(MDI) is the beast treatment, fabric-fabric adhesion strength is 16.73 kgf, fabric-rubber adhesion strength is 18.70 kgf, fabric-fabric and fabric-rubber adhesion strength that improve 54.6%、69.6%.