Advanced Materials Research Vols. 332-334

Abstract: In this paper, the processing technologies of Nylon 6 POY (46dtex/72f) and DTY (38dtex/72f) fibers with super-denier by means of self-made rare-earth masterbatch are illustrated in details. The influence of rare-earth masterbatch’s content and knitting technologies on the properties of DTY fibers with porous superfine-denier is also particularly discussed. And finally we find out the best spinning techniques for PA 6 POY fiber and knitting process for PA 6 DTY fiber with porous superfine-denier.

Abstract: In fiber melt spinning, a bunch of polymer melt filaments are continuously drawn and simultaneously cooled with air in order to obtain solidified yarns, which later compose the synthetic fiber in the bobbin. Melt spinning is a basic non-isothermal operation in the production of synthetic fibers, and the velocity and temperature fields in the filaments can be useful to control the quality of the final product. Therefore, the research of the temperature and the speed in the spinning path will be very important. Based on the theory of melt rheology, the co-extrusion morphology and performance of polymer melts PA6 /PET which extrude from circular spinning porous are simulated using finite element method. The effects of the fluid flux ration、cooling air temperature and winding speed on co-extrusion fiber interface and spinning process temperature are analyzed. And the simulated results show that the interfacial offset increases with the increase of the flow rate ratio of two polymers; changing the cooling air temperature, the temperature distribution has the same trend; low winding speed is conducive to the convergence of stretching rate. The simulated results can dynamically and quantitatively reflect the melt flow process, and these results can make guiding sense to engineering application.

Abstract: The effect of spinning speed on yarn quality at self-twist spinning system was investigated. The yarns were assessed for different characteristics using objective tests. The results show that yarn hairiness of self-twist yarn increases with the increase of spinning speed and yarn tenacity and extension decrease with increment of spinning speed. The results also show that yarn irregularity, yarn imperfections and yarn twist level have no obvious changes with the increasing in spinning speed. Furthermore, the longitudinal and cross-sectional shape of self-twist yarn were observed and the pictures show that S-twist and Z-twist zone have almost the same structure as the two-plied yarn at ring spinning system and no twist zone has an approximately 45mm length which can influence the strength of the self-twist yarn.

Abstract: Copper zinc oxide catalysts are effective for the ambient temperature carbon monoxide oxidation and display higher specific activity than the current commercial hopcalite catalyst. We investigate the copper zinc oxide catalyst prepared by co-precipitation under different atmospheres for the oxidation of carbon monoxide at low temperatures and these systems are now worthy of further investigation.

Abstract: The purpose of this study is to achieve a better understanding of the influences of enzymatic and caustic pretreatments on the dying adsorption behavior of Lyocell yarns. The substantivity behavior, dyeing adsorption isotherms and their correlation between the equilibrium modeling and equilibrium isotherm parameters of the pre-treated Lyocell fibers have been studied. Although the conditions of each treatment were the same, changing the processing sequences caused substantially different modifications on the Lyocell fiber fine structure with consequent effect on dyeing behaviors. In general, pretreatment by caustic soda and/or enzyme can improve their dyeability of Lyocell fibers. The results of dyes adsorption show that for the same enzymatic treatment condition if the enzymatic treatment stage is applied before the caustic pre-treatment, the dyeability and sorption ability of small molecule dye on pre-treated Lyocell can be improved over that which can be obtained for caustic pre-treated yarn.

Abstract: The studies in recent years show that solid materials such as rock and concrete always have regular thermal infrared (TIR) characteristics when the solid samples are loaded, and the anomalous IR phenomena appear before samples failure. In order to understand the IR change characteristics and physical mechanism of engineering solid samples externally loaded, some IR detection experiments results were achieved, including TIR imaging of rocks failure under uniaxial compression, TIR imaging of interaction between bolt and rock uniaxially loaded, TIR imaging of roadway deformation, and TIR imaging of ultra-high molecular weight polyethylene (UHMWPE) tensile failure. It is discovered that the temporal sequential features of the TIR radiation are connected with mechanical behaviors, and they show different staged characteristics. According to the change ratios of TIR temperature (TIRT) of the different areas of the surrounding rock, the acting area of bolts are determined. The bolted ranges are the same as the results of numerical simulation with FLAC3D. The relationships of UHMWPE were analyzed between average TIR temperature (ATIRT) and strain and mechanical work. The prospective method will be applied in the fields of mining engineering, underground engineering and side slope engineering.

Abstract: A series of novel sulfonated poly(arylene ether sulfone) (SPAES) were prepared by aromatic nucleophilic substitution polycondensation of 4,4’-dichlorodiphenylsulfone (DCDPS), 3,3’-disulfonated-4,4’-dichlorodiphenylsulfone (SDCDPS) and new type fluorinated bisphenol monomer---4-fluorophenyl hydroquinone. Different degree of sulfonation (DS) of these SPAES could be controlled by varying the feed ratio of SDCDPS to DCDPS. High molecular weights of the products were confirmed by inherent viscosity, which could reach 2.43 dl/g. The structures of the obtained polymers were characterized by FTIR, NMR. DSC and TGA analyses explained the excellent thermal properties of the resulting SPAESs. The temperatures at 10% weight loss were higher than 513°C. Furthermore, all the polymers showed excellent solubility in common organic solvents, such as NMP, DMAC, and DMF. So the films of SPAESs could be casted from their solutions.

Abstract: Sizing practice of the high count cotton hard twist yarn at the warping and sizer was researched. Key technologies in producing such material, such as the design of yarn structure, special spinning and preparatory technology, new sizing and weaving technologies were described in detail. The ratio of first grade of the fabric produced is 97%, which has reached the international advanced level. This paper provides some new technologies for sizing the high count cotton hard twist yarn.

Abstract: Silk-like fabrics mainly refer to polyester filament fabrics, the appearance and feeling of which is close to silk fabrics. In this paper, FDY polyesters with different dpf were used as wefts to make fabrics interwoven with silk and polyester. Through KES, drapability, luster, gas permeability and flexible test, this paper intends to discuss the influence of dpf to fabric property and style and the simulation mechanism of silk-like fabric comparing with the same kind of silk fabric.

Abstract: In this paper, the smart thermostat woven high-count fabric was researched, including the choice of fibers, special spinning technology, weaving technology, and finishing technology. The properties of the smart thermostat fabric were as follows. Average melting temperature was 23.2 °C, average melting endothermic was 12.6 J/g, average freezing temperature is 19.81 °C, and average solidification heat was 12.35 J/g. These mean that the fabric researched has the adaptive thermostat function. And the tested results also show that the fabric researched has reached the top level of the same kinds of fabric.