Papers by Keyword: Breaking Strength

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Authors: Wei Ming Wang, Bo Yu, Yun Feng
Abstract: The effect of thermal setting parameters namely tensile stress, temperature and time on the breaking strength and breaking elongation of hollow polyester (PET) fiber (PorelTM fiber) were investigated, and their synergistic effect was studied via orthogonal experiment. The results show that protection of fiber wall is an important task during thermal finishing process of hollow fiber. There are direct relationships between micro-molecular structure and mechanical properties. Orthogonal experiment analysis shows that the most significant effect factor for breaking strength and breaking elongation are temperature and tensile stress, respectively. The suggested thermal finishing conditions for PorelTM fiber are summarized as following: elongation (viz. tensile stress) 4%, temperature 165°C, and time 60s.
Authors: Cheng Yu Ma, Wei Li Hou, Yong Lin
Abstract: The paper presents the comparative test among the high temperature resistant filter (such as PSA fiber, PMIA fiber, PI fiber) of the bag filter about their heat resistance and the corrosion resistance. The research test the breaking strength, the breaking elongation and the molecular structure of those fiber. Experiments show that the breaking strength of the PSA increase slightly under the high temperature up to 250°C,while the breaking strength of the PMIA fiber decrease 75.26% and the breaking strength of PI fiber decrease 65.57%. After being soaked in the sulfuric acid solution for 96 hours, the strength retentions of PSA, PMIA-1 and PMIA-2 are 42%, 18.85% and 46.71%. The result of testing by FTIR shows that the amide bond of the PSA fiber fracture and generate phenolics and carboxylic acid after the chemical treatment, which is the main reason why the fiber strength of PSA decrease after the acid and alkaline corrosion.
Authors: Christof Landesberger, Christoph Paschke, Karlheinz Bock
Abstract: We investigated the influence of various backside thinning techniques on the fracture strength of thinned single crystalline silicon wafers by means of ring-ball breaking tests and atomic force microscopy (AFM). In the case of wafer grinding the mean breaking force of samples depends on the surface roughness after fine grinding. Subsequently applied stress-relief processes spin-etching, CMP polishing and plasma dry etching lead to a strong increase of breaking force by a factor of 6 to 15. The three different stress-relief techniques resulted in the same maximum values of breaking force. However, the required amount of material removal is specifically different and also depends on the conditions of initial grinding step. The results will help to identify optimum wafer thinning sequences in the field of MEMS devices and future applications of ultra-thin and flexible integrated circuits.
Authors: Cheng Qian, Hai Ning Lv
Abstract: Needle punching geotextile composites are composed of polypropylene woven fabrics and nonwovens, which has lower strength than that of the original woven fabrics because of the damaging effects by needles during the bonding process. In order to compensate for this shortage, a new geotextile composite was developed using adhesive as bonding media, temperature for controlling adhesive bonding effects. So temperature is the most important factor influencing the composites. With the purpose of researching temperature effects on the performance of polypropylene woven fabrics (single layer of the geotextile composite), a series of tests were carried out and then analyzed. The results show that with the increment of temperature, the shrinkage rate of polypropylene woven fabrics increased continuously. On the other hand, the strength firstly rise with the temperature and then decreased when temperature is over 130°C. Conclusions got in the paper are good references for the development of a new kind of water-insoluble adhesive and adhesive bonded nonwoven geotextile composite.
Authors: Ming Shu Song, Jie Lin, De Hong Cheng, Sheng Lu, Xu Hao, Yan Hua Lu
Abstract: in this paper the dyeing performances of the modified cotton fabric with ionic liquid 1-butyl-3-methylimizolium chloride as modifier was investigated. The effect of pH value, dosage of ionic liquid, modified time, modified temperature on the dyeing performances of the modified cotton fabric was determined. The obtained results indicated that after the cotton fabric was modified by ionic liquid under the alkaline the dyeing performances of the modified cotton fabric was obviously enhanced. The K/S value of the modified cotton fabric was about 1.42 more than that of the untreated cotton fabric, the soaping fastness, rubbing fastness and breaking strength also were obviously enhanced.
Authors: Jia Horng Lin, Chen Hung Huang, Chao Yin Hsiao, Kuo Cheng Tai, Jin Mao Chen, Ching Wen Lou
Abstract: In this study, carbon fiber/ polypropylene (PP) complex braiding yarn, with its different breaking strength, was prepared. It was designed by braiding polypropylene (PP) wrapped yarn and carbon fiber core yarn using eight and sixteen spindles braiding machines, with change of take-up gear number. Environmental factors, such as pH, temperature and time, were also changed to produce geo-grids with high strength, high modulus and better weather resistance. In order to make stable structure for complex braiding yarn, the heat treatment was also considered. Finally, geo-grids braiding by optimal treatment parameters were cut into single rib and junction specimens for tensile test.
Authors: Hong Cai Ma, Shi Lin Lu, Long Di Cheng, Shi Ping Xu
Abstract: Compact spinning eliminated the harmful effects of spinning triangle, as the edge fibers are incorporated into the yarn due to the elimination of the spinning triangle. The compact yarns possess less hairiness, higher breaking strength and breaking elongation compared with the conventional ring-spun yarns. In this article, we study the mechanism of compact spinning with suction groove and analyze the compact action in twisting fiber strip. Some quality parameters of wool compact spinning with suction groove are compared with those of wool conventional ring-spun yarns. The changes of hairiness are analyzed in the different spinning conditions. This provides related data for improving compact spinning system with suction groove.
Authors: Wei Bang Chen, Shu Hui Pang, Lai Li Wang, Xue Mei Ding
Abstract: This paper measured the breaking strength of nonwoven shopping bag, which sampled from 5 kinds of fabric weight with 5 kinds of seam density and 2 types of seam methods. Based on the result of orthogonal experiment,the load bearing model is established by three-element non-linear model with two variables—fabric weight and elongate ratio of the nonwoven. Model verification shows the maximum relative error is lower than 10%. This model is proper to be applied to calculate the load bearing of 100% Polypropylene nonwoven shopping bag.
Authors: Xue Min Hu
Abstract: PAN fiber is one that contains at least 85% by mass of acrylonitrile co-monomer in the polymer chain. It has low moisture-absorbency and electrostatic tendency. Using collagen modified PAN fiber can overcome the shortcomings. Collagen modified PAN fiber is a kind of surface modification fiber which was hydrolyzed by NaOH aqueous solution first, and then grafted with collagen. The performance of collagen modified PAN fiber was studied. The results show that: compared with PAN fiber, the surface of collagen modified PAN fiber is smooth and covered by collagen composition, the moisture regain increased from 2% to 6.1%,the breaking strength and elongation of collagen modified PAN fiber are decreased, the breaking strength is 2.31 cN/dtex, the breaking elongation is 22.8%, dyeing properties of collagen modified PAN fiber with cationic dyes and acid dyes are excellent and the goods have bright color and good color fastness.
Authors: Tao Jiang, Ying Ding, Yong Shen
Abstract: Kapok fiber has a unique large thin-walled hollow structure, lightweight and water repellent oil of excellent features, and is not yet fully exploited the small breed natural fibers. In the development process of the use of kapok fiber, there is a problem of dyeing, finishing, dyeing rate, dyeing and poor. Plasma processing technique is a modification to the fiber surface, non-polluting promising new technologies and has energy efficient. The research kapok fiber after plasma surface modification, found kapok modified staining rate has been significantly improved absorbent; Modified kapok fiber mechanical properties are not changed significantly; While exploring the plasma modified kapok fiber optimum.
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