• KSTLE International Journal
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• v.8 no.1
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• pp.1-6
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• 2007

Chromatic device was developed using light emitting diodes, optic fibers and photodiodes. Chromatic ratio and total contamination parameters based on transmitted light intensity in Red, Green, and Blue wavelengths were used for oil chemical and particulate contamination assessment. Chromatic ratio criterion was found independent of the particulate contamination of oil; but depended on chemical degradation, being more sensitive for synthetic than mineral hydraulic oil. Total contamination index of the sensor depended on both the chemical degradation and particulate contamination of the oil; being most sensitive in blue wavelength, and least in the red. Test results for synthetic hydraulic oils monitored corroborated with results of other tests such as viscosity, total acid number, elemental optical emission spectroscopy, particulate counts and UV-VIS photospectrometry. Chromatic ratio showed a clearer indication of oil degradation, compared to key monitoring parameters such as total acid number, viscosity and particle counts. The results showed that these parameters are effective criteria for the condition monitoring of synthetic hydraulic oils.

• Journal of the Korea institute for structural maintenance and inspection
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• v.15 no.4
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• pp.125-135
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• 2011

The bond properties between polypropylene fiber reinforced cement composites and structural synthetic fiber have been investigated. in this paper. Three levels of polypropylene fibers volume fraction were used, 0.10%, 0.15%, and 0.20% in a series of Dog-bone pull out tests. The bond strength between structural synthetic fiber and polypropylene fiber reinforced cement composites increases with the volume fraction of polypropylene fiber, but the bond strength decreases above the amount of 0.20% by volume of polypropylene fiber reinforced cement composites. Also, the addition of polypropylene fiber a significant improved the interface toughness and the frictional resistance, The microstructure of structural synthetic fiber surface was investigated after the pullout test. The scratched of structural synthetic fiber increased with the polypropylene fiber volume fraction.

• Journal of the Korean Society of Clothing and Textiles
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• v.3 no.1
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• pp.49-56
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• 1979

To investigate detergency of various woven fabrics in relation to the detergents and washing temperature. cotton, polyester/cotton (p/c), nylon, acetate, and polyester were soiled in aqueous artificial ($carbon-CCl_4$) soil. Each fabric was washed with soap, alkaline and neutral synthetic detergents at $30^{\circ}C$, $40^{\circ}C$ and $60^{\circ}C$ respectively. The results obtained may be summerized as follows; 1. In soap, ascension of temperature had the most important effect upon washing efficiency and the higher the temperature was, the higher the washing efficiency was showed in all fabrics. And in case of alkaline synthetic detergent, nylon and p/c fabrics were much more difficult to clean at higher temperature and also acetate and polyester had the best efficiency at $40^{\circ}C$. Detergency of neutral detergent was good but the effect of temperature in neutral detergent was less than in soap. 2. Washing efficiency of cotton was less than that of others. 3. The higher the temperature was, the higher the washing efficiency of cotton in all detergents, and the best was in soap. In p/c, detergency of neutral detergent was good but effect of ascension of temperature was lower than in soap. In nylon, washing efficiencies of alkaline synthetic detergent and neutral detergent were excellent at 30°C but detergency of soap at $60^{\circ}C$ was best. In case of acetate, detergency of all detergents was about the same at $30^{\circ}C$ but that of soap at $60^{\circ}C$ was best. In polyester at $30^{\circ}C$, efficiency of neutral detergent was excellent but that of soap was more excellent at higher temperature and the best detergency of alkaline synthetic detergent showed at $40^{\circ}C$. In general. the higher the temperature is, the higher the washing efficiency of soap is. But when synthetic fibers of nylon and polyester are washed with synthetic detergents, washing at lower temperature is advisable.

• Proceedings of the Korean Fiber Society Conference
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• 2003.04a
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• pp.165-168
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• 2003

Nylon was the first commercialized synthetic fiber. It is a polyamide, derived from a diamine and dicarboxylic acid. The nylon fiber has outstanding durability and excellent physical properties such as stiffness, wear and abrasion resistance, friction coefficient and chemical resistance. Due to these properties of nylon 66, nano-sized fibers are produced by electrospinning method in this study. During the past years the nylon 66 fibers have been prepared by conventional melt spining. (omitted)

• Proceedings of the Korean Society of Agricultural Engineers Conference
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• 1998.10a
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• pp.444-448
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• 1998

This paper presents the results of an experimental investigation on the compaction and compressive strength of polypropylene fiber reinforced soils. This study has been performed to obtain the physical properties of PFRS(polypropylene fiber reinforced soil) such as strain-stress relationships, OMC(optimum moisture contents) and ${\gamma}$$_{dmax}$ (maximum dry unit weight), with four different concentrations(i.e., 0.1%, 0.3%, 0.5% and 1.0% weights) of mono-filament and fibrillated polypropylene fibers. The test results indicate an appreciable increase in strength due to addition of fibers. OMC is increased with the concentration ratio of fiber, but ${\gamma}$$_{dmax}$ is decreased. From the viewpoint of strength, the fibrillated polypropylene fiber soil is more effective than the mono-filament polypropylene fiber soil.oil.

• Proceedings of the Korea Concrete Institute Conference
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• 2003.11a
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• pp.629-634
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• 2003

The cement-based composites have relatively low tensile strength and toughness. The fiber addition is one of the most important ways of increasing the toughness of concrete. The steel fibers have been used conventionally in the shotcrete of tunnel lining. Recently, the structural synthetic fibers were developed and used frequently in some actual tunnel shotcreting in foreign countries. There are so many method to evaluate a toughness; ASTM, JCI, EFNARC, etc. But these methods contain a few defects. So most researchers are studying to develope a new toughness evaluation method. A RTA is one of these methods. The purpose of this study is to explore the strength and toughness characteristic of the fiber reinforced concrete panel according to the geometry; diameter, thickness. The result were compared with those of steel fiber reinforced concrete.

• Journal of the Korean Home Economics Association
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• v.19 no.2
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• pp.143-149
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• 1981

Consumer consider the purpose for which they plan to use clothes when they purchase it, and the socks in textile products is evaluated in the same way. serviceability is judged by the extent to which the socks will be useful for its intended purpose. It should retain its original shape and size, good air permeability, good absorbency, good abrasion resistance, high fastness etc. Owing to importance of serviceability in socks, in this paper, these end-use requirement characteristics were tested. The results obtained were as follows: 1. Blend ratios were different between the indicated fiber contents on labels and the testing ones. 2. Air permeability was higher in the samples which contain less stitch density, and hydroscopicity was higher in those which contain natural fibers such as cotton and wool. 3. Shrinkage depended on the blend ratios of cotton and wool, and elastic recovery was better in the course direction than in the wale direction. 4. Pilling was conspicuous in the synthetic fibers such as polyester and nylon, and fastness of laundering and perspiration was higher in the fading grade than in the staining grade.

• Proceedings of the Korean Fiber Society Conference
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• 2003.10b
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• pp.265-266
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• 2003

The first developed engineering plastic and synthetic fiber, Nylon has been widely used because of its excellent properties. Recently, electrospinning has been gradually spotlighted as a different method of producing fibers, in which fibers of submicron can be consistently produced [1,2]. In this work, we have prepared nanofiber non-woven from Nylon 66 of which properties were investigated. The morphological properties of Nylon 66 non-woven was observed by SEM. (omitted)

• Journal of the Korean Home Economics Association
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• v.36 no.1
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• pp.117-128
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• 1998

This study examined the relationships between textile fiber preference(natural, synthetic, blended) and the perceived importance of textile properties, knowledge of textile fibers and demographic variables, focused on children's outdoor clothing. Subjects were 291 mothers with preschool children. Data were collected using a self-administered questionnaire and analyzed using analysis of variance and crosstabulation analysis. The results indicated that; (1)preference of fiber was significantly related to the perceived importance of textile fiber properties concerning flame resistance, absorbency, and hand. (2)blended fiber preference group had more knowledge on textile fibers than the other groups. (3)preference of fiber was significantly related to the perceived differences of textile performance characteristics in comfort. (4)None of demographic variables influenced textile fiber preference. (5)No difference in price consideration was found between the textile fiber preference groups.

• Journal of Fashion Business
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• v.9 no.3
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• pp.114-124
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• 2005

Based on the previous study, three types at synthetic fibers comprising nylon, PET, and acrylic fibers were investigated in this study. The effect at mordanting on the air-permeability and dyeing properties at fabrics was investigated. The effect at rinsing process on the air-permeability and color was quantitatively investigated by rinsing the mordanted fabric specimens 1$\sim$3 times after mordanting. The air-permeability changed peculiarly according to the characteristics of the tiber materials after mordanting. The air-permeability values of nylon and acrylic fabric specimens dropped significantly after mordanting. On the other hand, those of PET fabric specimens hardly changed after mordanting. The metal ions absorbed on the fibers of nylon and acrylic fabrics did not show the mordanting effect. Regardless of mordanting, cochineal dyestuff made direct links with the molecular chains in nylon fabrics exhibiting dark colors. After dyeing acrylic fabrics, the color did not develop at all, even though partial components of the cochineal dyestuff were absorbed apparently.