• Proceedings of the Korean Society of Precision Engineering Conference
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• 2001.04a
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• pp.350-353
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• 2001

Due to the widen demand of plastic part in automobiles, more accurate numerical simulation works are needed to find optimum molding process like filling fiber orientation pressure control. Therefore, C-mold software was applied for the simulation of injection molding process and cooling process in this research. The purpose of this study is developing a ball seat which made by injection process with PA66 resin and it is applied to the automobile suspension system. It must secure low friction, wear resistance and dimensional accuracy. Specially this study aims to get the quality stabilization of injection molded bass-seat parts.

• Fashion & Textile Research Journal
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• v.9 no.1
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• pp.96-102
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• 2007

Antibacterial finishing of nylon 66 fabrics was carried out with sericite and medilite which are a cheap price antibacterial agents and had excellent antibacterial effects. The particle size of sericite and medilite was 15 ${\mu}m$ and 30 ${\mu}m$. The antibacterial and deodorant ratio, tensile and tear strength, peel strength were examined to investigate the change of physical properties and antibacterial effect. The results are as follows. 1. Peel strength is increased with increasing adhesive content, and satisfied standard value of peel strength when adhesive content is 20 $g/m^2$. Also peel strength was decreased with increasing antibacterial agent content and particle size in the adhesives. 2. Tensile and tear strength were not related with antibacterial agent content in the adhesives. 3. Laundering nylon 66 fabric treated with antibacterial agent, the optimum content satisfying Korean Standard(KS) is 8%. The antibacterial and deodorant ratio were not affected by several types of adhesives.

• Textile Coloration and Finishing
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• v.16 no.4
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• pp.1-9
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• 2004

In recent, development of nano fiber has been one of the most active subjects in the world. Nano fiber is defined as a ultra fine yarn with a diameter unit of $10-100\times10^{-9}meter$, which is possible to be produced by an electro-spinning technology. In this study, physical characteristics and dyeing properties of nylon 66 nano fiber were investigated. Nylon 66 nano fiber was dyed with levelling type acid dyes. X-ray diffraction method and DSC analysis were used for the measurement of the degree of crystallization. Analysis of amino end groups was also performed in order to examine a relationship between number of amino groups and its dyeing property as well as water absorption behavior. The maximum exhaustion % of dyes and dyeing rate under various dyeing conditions, such as dyeing temperature and pH in dye bath, along with build-up properties for 2 acid dyes were evaluated. It was found that the degree of crystallization of nano fiber was smaller than that of regular fiber, and amino end groups of nano fiber were less than regular fiber. Half dyeing time of nano fiber was shorter than regular fiber because of the bigger specific surface area. Effect of pH on exhaustion % was small in case of nano fiber. Exhaustion of nano fiber increased with higher concentration of dye.

• Applied Chemistry for Engineering
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• v.25 no.1
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• pp.90-95
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• 2014

Nylon66 extrudates as a function of the extrusion number were prepared by a twin screw extruder. Chemical structures, thermal properties, melt index, crystal structures, mechanical properties such as the tensile strength, elongation at break and impact strength, and rheological property were measured by FT-IR, $^1H$-NMR, melt indexer, DSC, TGA, XRD, universal tensile tester, Izod impact tester, and rheometer. FT-IR and $^1H$-NMR characterizations indicated that the number of extrusions did not affect the chemical structure. The decrease in the molecular weight was checked by the melt index of extrudates. There were no effects of the thermal history on the melting and degradation temperature. The tensile and impact strength and modulus were found to be similar, regardless of the number of extrusions, but the elongation decreased significantly. The complex viscosity of extrudates at low frequencies decreased with the extrusion number. No structural changes after extrusion were confirmed from the fact that there was no change in the slope and shape of G'-G" plot.

• Applied Chemistry for Engineering
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• v.9 no.2
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• pp.226-231
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• 1998

Hot melt adhesive which is solventless type has been widely used due to the possibility of automated adhesion process. The main purpose of this study is the development of polyamide based hot melt adhesive to improve the property of conventional ethylene-vinyl acetate hot melt adhesive, which has an inherent problem against heat resistance. In this study, it was found that the terpolymers of nylon 6, nylon 66, and nylon 12(CM831, 843P types) instead of nylon homopolymer were suitable base resins for hot melt adhesive, since the disruption of regularity in the polymer chains reduced the crystallinity, resulting in lower melting point and melt viscosity. According to the results, the optimum adhesion property could be obtained by the using 75/25~50/50 weight radio of CM831/843P resin as a base resin. Terpene resin was used as tackifier to improve adhesion and wetting properties. The best result can be obtained with the 10 wt.% addition of terpene resin. The terpene resin acted as proper tackifier in this system which decreased the melt temperature and viscosity, but increased the mechanical strength of adhesive itself. Also, the rheological property of the adhesive changed from typical non-Newtonian behavior to Newtonian behavior as terpene resin was added.

• Journal of the Korean Society for Precision Engineering
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• v.17 no.5
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• pp.63-69
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• 2000

The main target of this research is investigating the relations between mechanical properties and injection conditions, like injection pressure, packing pressure and packing time for various contents ratio of glass fiber and resin. In general idea, high injection pressure produces high strength of molded parts as a monotonic function. but it was revealed that high pressure does not make high strength directly through various experiments of injection molding. In this experiments, PA66 was selected as resin and Glass Fiber was selected as reinforcing fiber Fiber reinforcement was controlled, as 14%, 25%, 33%, 44% of total volume and packing pressure was divided 55%, 65%, 75%, 85% of reference pressure, i.e. 100% equal to 1400kgf/$\textrm{cm}^2$. Finally, tensile testing was executed for injected test specimen. Optimum results based on authors' experiments have been obtained under conditions of 25% and 33% of glass fiber contents. Tensile strength rather depends on the packing pressure and packing time than injection pressure. Especially almost equal value of tensile strength was obtained for various percentage of packing and injection pressure as 65%, 75% and 85% of reference pressure.

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2011.03a
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• pp.66-66
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• 2011

우리나라 근해의 풍부한 해양자원인 해조류를 염재로 한 천연염료의 제조는 자원의 부가가치를 높일 뿐만 아니라 새로운 색소성분의 발굴과 함께 천연염색의 색상 다양화 효과를 얻을 수 있다. 본 연구는 국내 자생 해조류로부터 다양한 색상을 얻기 위해 여러 가지 추출공정을 사용하여 색소를 추출하고 염색성을 조사하여 새로운 염재로서의 유효성을 확인하는데 목적이 있다. 이를 위하여 사용한 해조류는 제주에서 자생하는 구멍갈파래, 청각이다. 해조류 색소를 추출하여 분말화 형태로 만들어 염색하였고 추출공정에 따른 다양한 색상 구현을 할 수 있게 되었다. 해조류 색소의 특성을 알아보기 위해 UV-Vis, FT-IR 분석에 의해 그 성분을 확인하였다. 염색은 면섬유, 견섬유, 모섬유, 나일론섬유를 사용하여 염색하였다. 추출공정의 다양화를 통해 해조류 색소를 직물에 염색했을 때 직물의 색상과 염착량에 미치는 영향을 평가하였고, 세탁, 마찰 그리고 일광에 대한 견뢰도를 측정하였다. 색소의 기능성을 평가하기 위해 해조류 색소분말의 황색포도상구균(Staphylococcus aureus)에 대한 항균성을 평가하였다. 본 연구에서 추출공정을 달리하여 제조한 해조류 색소는 다양한 색상구현에 적합하였고, 견직물과 모직물에 염착이 잘 되었다. 또한 해조류 색소는 항균성을 지녀 향후 기능성 천연염료로서 응용가능성이 매우 클 것으로 전망된다.

• Elastomers and Composites
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• v.34 no.3
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• pp.253-261
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• 1999

The cure properties of rubber compounds containing different adhesive compositions were examined. As the amounts of tannin were increased in the adhesive composition, the scorch time was increased and cure rate was decreased due to the size and shape of tannin molecules. Also, the effect of adhesive composition on the adhesion between rubber and fiber was examined by TCAT(Tire Cord Adhesion Test), The reinforcing cords used in this study were mon ofilaments of nylon 610 and nylon 66. According to the results, the optimum adhesion strength between rubber and fiber could be obtained with adhesives whose molar ratios of formaldehyde/resorcinol were above 5/1 in the recipes. Although the level of dip pick-up(DPU) on the reinforcing cord affects the adhesion strength, the DPU of nylon 610 monofilament did not affect the adhesion strength because the level of DPU was constant regardless of the adhesive compositions. In this case, the adhesion strength with the adhesive composition could be explained with the behavior of tannin in the adhesive.

• The monthly packaging world
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• no.8 s.184
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• pp.66-69
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• 2008

원자재 가격상승과 유가 폭등으로 인해 국내 폴리에스터 업계는 중국 제품에 가격 경쟁력이 밀리는 범용 제품 비중을 줄이고 부가가치가 높은 광학 및 특수용도 제품 비중을 높여나가는 등의 노력에 주력하고 있다. 유가 인상과 단가 하락 압력, 경쟁 격화 등으로 포장재 등에 쓰이는 범용 PET 필름은 물론 확산필름 등 일반 LCD용 광학필름의 수익성이 낮아지면서 수익성이 좋은 분야의 비중을 확대하려는 움직임에 따라 올해 폴리에스터(PET) 필름 업계의 화두는 광학 및 태양전지에의 PET 필름의 적용 및 응용이었다. SKC가 먼저 광학필름의 원자재로 쓰이는 고순도 후막 베이스필름이나 태양전지나 하이브리드 자동차 부품용 필름 분야로 진출을 계획중이며 코오롱도 후막 필름 라인을 1기 증설하고 기존 포장재 라인도 전환키로 했다. 또한 도레이새한도 후막 필름을 주력제품으로 끌어올릴 계획을 갖고 있다. 본 고에서는 PET 필름 및 나일론 필름 수급동향을 살펴보고, 업체별 상황 및 전망을 살펴보도록 한다.

• Fashion & Textile Research Journal
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• v.5 no.3
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• pp.267-272
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• 2003

Tactel(Nylon66) union fabrics were woven with the specification of 70d/34f nylon as warp for sport wear jacket. Weft yarn has three types; 100% cotton yarn, nylon core-spun yarn and nylon-polyurethane covering yarn as weft. Fabric structers were plain, twill and satin weave structure with the air jet loom. The mechanical properties of 8 fabrics were measured with KES-F and primary Hand Values and Total Hand Values were calculated. The results of the study were as follows: 1) There was little difference among LTs of N/CM fabric groups. RT of the fabrics with CM100's was bigger than that of fabrics with CM80's, resulting that the fabrics with CM100's have better formability. In terms of weaving structure, twill fabrics have shape deformation. 2) In comparison of RTs with weft yarn type, RT of N-PU covering yarn was the highest, followed by Nylon core-spun yarn and cotton yarn. Thus, the fabric with N-PU covering yarn has better stability of shape deformation. 3) Stretch yarn could express an excellent silhouette formation and twill and satin structures were better structure to make curvature on human form. 4) 2HG/G value of nylon core-spun fabrics was larger than that of N/C fabrics, but the silhouette formation of N/C fabrics was excellent. 5) The RC of N/PU was the highest, followed by N/P, and N/CM. 6) Koski of N/PU fabrics was the highest, Numeri of N/PU and N/Co-I were relatively higher than the others. THVs of N/CM-IV and N/CO-II were lower than the others, resulting that, twill structure was better than plain structure for a sport wear uses.