Advanced Materials Research Vol. 796

Abstract: Integrated antenna is a kind of functional fabric which is used for positioning and navigation. In this thesis, this antenna has been successfully developed with Φ0.1mm copper wire and 500dtex polyester as materials which combined ground plate, dielectric substrate and radiation layer together, utilizing the theory of the textile multilayer’s connection. The test result shows that when the working frequency was 1.575GHz, the value of RL(Return Loss) was 3.4dB. And the axial ratio was -14.7dB. Moreover transmission gain shows the value 3.7dBi. In conclusion, this antenna has already met the GPS applying requirements.

Abstract: Chinese traditional favonian patterns as a kind of language and symbol, has been widely applied in the design of silk home-textile, on the basis of description of Chinese traditional favonian patterns, then from three aspects, which are the extension of meaning,the adornment of the form,the combination of pattern and color, to focus on the creative applications of the Chinese traditional favonian patterns on silk home-textile design, to help the design of silk home-textile product.

Abstract: This paper is using the cocoon filament prices index from the website named the east-sericulture-shift-to-west engineering information system as the research background, seeking for the quantitative analysis and forecast of the cocoon filament price index and making forecast and evaluation for market operation. This paper respectively establishes the improved GM(1,1) model and Grey-Markov model and compares the prediction results of the two models. When using the Grey-Markov model, the data prediction accuracy is higher and it can reflect the volatility of the data.

Abstract: Melt blowing is a typical nonwoven process for producing superfine fibers. In this process, the high velocity hot air jets attenuate the polymer melt into superfine fibers. Therefore, the fiber diameter is strongly affected by the air flow field. Dual slot die is one of the widely used melt blowing dies. Hot air emits from the two slots symmetrically. What will happen to the polymer drawing if the air jets are unsymmetrical In this paper, the unsymmetrical air flow field of the dual slot die in melt blowing process is simulated numerically. The distributions of air velocity and air temperature are obtained. The polymer drawing model is then solved with the aid of the simulation results of air velocity and air temperature. The diameter and transverse displacement of the threadline along the spinline is achieved. The result shows that the threadline diameter of unsymmetrical air flow field is larger than that of the symmetrical air flow field and the threadline tends to deflect because of the unsymmetrical air jets. This paper helps to indicate the research direction for further decreasing the fiber diameter of melt blown nonwoven fabrics.

Abstract: The melt blown nonwoven fabrics are characterized by superfine fiber structures. The key technology of achieving superfine fibers is the polymer drawing by the high velocity hot air jets. The temperature distribution of the air flow field has great influence on the polymer drawing. In this paper, the air temperature distribution of the dual slot die on an HDF-6D melt blowing nonwoven equipment is simulated and measured. The air flow field model of the dual slot die is established and solved numerically using the finite volume method and SIMPLE algorithm. The air temperature is measured with a temperature measuring system built for this research. Experimental results show that the simulation results of the air temperature coincide with the measured data which indicates the air flow flied model is effective. As this research is performed on an industrial melt blowing equipment, the results have great application values for actual production of melt blowing.

Abstract: Melt blowing process can produce superfine fibers. In this process, the polymer is drawn by the high velocity hot air jets from the dual slot die. The die parameters have great effects on the fiber diameter. In this paper, the die parameters of the dual slot die in an industrial melt blowing equipment are studied using the orthogonal experimental design method. Three parameters namely the inset distance, slot width and slot angle are considered. Each parameter has three levels. Nine sizes of dual slot dies with different design parameters are numerically simulated using the established air flow field model of melt blowing process. Distributions of air velocity and air temperature of nine air jet flow fields are obtained. Effects of the three parameters are studied with range analysis and variance analysis. The results show that the inset distance and slot width have significant effects on the air flow field while effect of the slot angle is unremarkable. Finally the optimal die parameters are obtained. The results lay the theoretical foundation for further studies on the computer assisted design for the dual slot die in the melt blowing process.

Abstract: The testing of the blend ratio of cashmere/wool yarns is mainly depended on human-powered. It introduced the colors divergence of two fibers using HI-1 dye to stain into the blend yarn of wool and cashmere. The colored samples were then, sliced and imaged. Both the cashmere and wool that have some color information were withdrawn from the background. Then work out the blend ratio according to the fiber cross section size. This study demonstrated a speedy and accurate approach to analysis blend ratio.

Abstract: This study focuses on business relationships in Japan for industries pertaining to dyeing and finishing. The authors analyzed the complex network of 3354 companies contained in the Annual Report on the textile-related trade, 1998 edition published by Sen-I Sha Company. Based on community extraction proposed by Newman in 2004, there are 46 communities in complex network and 2 large competitive communities containing a lot of dyeing and finishing companies are existed. As results of community extraction of the complex network that deletes one big company on the betweenness centrality, the structure of the community is changed.

Abstract: With increasing competition in garment industry, many companies have to improve their efficiency of production and reduce the cost through management, which have become one of the important issues of garment production research. In this paper, the process of garment cutting was divided into several key factors. Combined with the real situation of garment cutting in manufactory, the related influence factors of every factor were also discussed. Based on the study of the process of cutting, the operation processes of garment cutting were investigated and the time consumption of every process was measured. The parameters used for time consumption were proposed. It can be expected that the results of this research can be used to provide reference on the determination of standard time of cutting processes. The results of this research are also great instructive importance for the enterprises to improve the efficiency of garment cutting and the standardization of operation time in order to make a scientific and reasonable working schedule for decreasing production cost and increasing economic benefits.

Abstract: The meta-aramid fibrids were prepared by precipitation in this paper. The meta-aramid solution dissolved in the solvent system DMAc/LiCl was injected into the high shearing coagulant at room temperature and the mixture of water and N, N-dimethylacetamide(DMAc) was used as coagulant. The shearing rate, viscosity of the solution and the concentration of water in coagulant were the main factors on effecting the formation of fibrids. The meta-aramid fibrid has a gradual weight loss process when the temperature increases from 100°C to 400°C, lower thermal property of meta-aramid fibrid was due to the hydrogen bonding and crystalline structure were broken during dissolving process, however, a flexible and easy dispersing property of meta-aramid fibrid in fluid is due to its amorphous structure, which are very important that the meta-aramid fibrid has a better binding and adhesive property with the aramid short fiber in aramid paper, then yield a high mechanical and insulation property for aramid paper. Then, the properies of aramid paper were investigated. The results indicated that the proportion of meta-aramid fibrid in the aramid paper and the length of shorten aramid fiber are the main factors for affecting the strength and the other properties of aramid paper.