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김문상 한국섬유공학회 1970 한국섬유공학회지 Vol.7 No.2
The initial load-extension moduli of symmetrical weaves are analysed by means of seperation of crossing and floating in them for the purpose of fundamental studies on the fabric handle. To confirm the validities of the analysis, the theoretical values of initial moduli of symmetrical weaves are compared with experimental results which are obtained and estimated with their 95% confidence level by the initial-load extension curve from Instron universal testing machine and it is shown that theoretical values are approximately in accord with experimental values. It is found that floating in symmetrical weave of n=2 does not have influence on its initial modulus, and yarn density as well as yarn size in grey cloth of symmetrical weave have much influence upon its initial modulus.
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위편공정에서 급사장력이 위편성물의 Cover Factor에 미치는 영향
김문상 한국섬유공학회 1975 한국섬유공학회지 Vol.12 No.2
In order to investigate the effect of yarn feeding tension on the cover factor of weft knitted fabrics some experiments were carried out with the variables such as yarn feeding tension, loop density, yarn characteristics and weight of take-up mechanism of weft knitting machine. The experimental results were discussed by the method of analysis of variance. The conclusions were as follows; (1) the yarn characteristics were considered to be factors affecting on the cover factor of plain weft knitted fabrics. (2) It was considered that the yarn characteristics and loop density of plain weft knitted fabrics interact mutually and their interaction was considerd to be a factor affecting on the relaxation shrinkage. (3) As long as the yarn feeding tension and the weight of the take-up mechanism are below the experimental value of the feeding yarn, they do not affect on the relaxation shrinkage.
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김문상,이재곤 한국섬유공학회 1969 한국섬유공학회지 Vol.6 No.2
In order to define the twist structure of yarn, it was assumed that the twisted yarn has a coaxial helix structure. With the assumption it was viewed that the theorical retraction approached to the experimental retraction. Also, it was shown that, even if the thickness of yarn varies, the retraction of yarn was independent on the turn per centimeter if the value of nb remains constant.
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김문상,김노수,김상용,Kim, Mun-Sang,Kim, No-Su,Kim, Sang-Yong 한국섬유공학회 1966 한국섬유공학회지 Vol.3 No.2
Studies were carried out on shrinkage of cotton rib knit fabrics and the following results were obtained: Wale shrinkages increase abruptly in (+) direction and course shrinkages in (-) direction beyond a certain c.p.i. limit. Effects of the immersion time and temperature to shrinkages are random and negligible. Bleaching increases considerably the shrinkages of rib knit fabrics. Area shrinkages increase linearly with c.p.i and the more complex the constructions are, the larger the increasing ratios. Increasing ratios of area shrinkage of bleached are larder than the scoured and immersed.
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김문상,조경래,박강,신현오,Kim, Mun-Sang,Cho, Kyung-Rae,Park, Kang,Shin, Hyun-Oh 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.8
Inspecting the dimensional accuracy of a car-body in assembly line is a very important process to assure high productivity. Now there exist two common inspecting methods in practice. One is to measure a sampled car-body with three dimensional measuring machine, and the other is to measure car-body with three dimensional measuring machine, and the other is to measure car-body in assembly line using many sensors fixed to a large jig frame. The formal method takes too long to inspect a sampled car-body of a same sort, and cannot therefore give an useful error trend for the whole production. On the other hand, the latter lacks flexibility and is very cost-intensive. By using industrial robots and sensors, an in-line Car-Body Measuring(CBM) system which ensured high flexiblity and sufficient accuracy was developed. This CBM cell operates in real production line and measures the check points by the non-contact type using camera and laser displacement sensor(LDS). This system can handle about 15 Measuring points within a cycle time of 40 seconds. A process computer controls whole process such as data acquisition file handling and data analysis. Robot arms changes in length due to ambient temperature fluctuation affecting the measuring accuracy. To compensate this error, a robot arm calibration process was developed.
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