• 한국의류산업학회지
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• 제16권1호
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• pp.145-152
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• 2014

The usage of textile-based sensors has increased due to their many advantages (compared to IT sensors) when applied to body assessment and comfort. Textile-based sensors have different detecting factors such as pressure, voltage, current and capacitance to investigate the characteristics. In this study, textile-based sensor fabrics with sheath-core type conductive yarns were produced and the relationship between capacitance changes and applied load was investigated. The physical and electric properties of textile-based sensor fabrics were also investigated under various laminating conditions. A textile based pressure sensor that uses a sheath-core conductive yarn to ensure the stability of the pressure sensor in the textile-based sensor (the physical structure of the reaction characteristic of the capacitance) is important for the stability of the initial value of the initial capacitance value outside the characteristic of the textile structural environment. In addition, a textile based sensor is displaced relative to the initial value of the capacitance change according to pressure changes in the capacitance value of the sensor due to the fineness of the high risk of noise generation. Changing the physical structure of the fabric through the sensor characteristic of the pressure sensor via the noise generating element of laminating (temperature, humidity, and static electricity) to cut off the voltage output element to improve the data reliability could be secured.

• 한국염색가공학회지
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• 제21권3호
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• pp.37-42
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• 2009

The low melting PET yarn has sheath/core structure: sheath portion consists of low melting point PET and core portion is regular PET. Dyeing properties of fabric made from low melting PET yarn were investigated at different dyeing temperatures. It was found that the exhaustion yield on the low melting PET fabric was higher than on regular PET fabric. The total K/S value of the dyed low melting PET fabric increased as heat setting temperature increased above $150^{\circ}C$ because the sheath portion of the low melting yarn melted. Although fastness to light of the low melting PET fabric was similar to regular PET fabric, fastness to washing was inferior to regular PET fabric by 1 grade.

• 한국염색가공학회:학술대회논문집
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• 한국염색가공학회 2012년도 제46차 학술발표회
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• pp.89-89
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• 2012

선행 연구에서는 m-Aramid와 p-Aramid의 Ring 방적사/Core 방적사 조건에 따른 방적사 물성에 대해서 연구하였는데, Ring 방적사의 혼용율, 스핀들 속도에 따른 물성 변화, Core 방적사의 공정특성에 따른 방적성, 피복성에 대해 연구를 하였다. 그 결과 Ring 방적사의 경우 m-Aramid의 혼용율이 증가할수록 사 강도는 증가하는 경향을 확인할 수 있었고, 스핀들 속도가 증가함에 따라서 불균제도 및 사결점이 다소 증가하였다. Core 방적사의 경우 Core에 p-Aramid를 사용했을 때 방적성과 피복성은 양호 하였지만, 강한 p-Aramid에 의해 톱 롤러코트의 마모가 되는 경향을 볼 수 있었다. 본 연구에서는 Ring 방적사/Core 방적사에 대해 좀더 구체적인 제조공정조건에 의한 물성 변화를 알아보았고, 좀더 다양한 섬유소재를 적용해서 제조하였다. Ring 방적사의 경우 p-Aramid 혼용율에 따른 실험을 하였는데, m-Aramid에 대한 p-Aramid의 혼용율을 0%, 5%, 10%, 20% 로 하여 Ne30을 제조하였으며, Core 방적사는 Core를 p-Aramid 200D로 하고 Sheath를 Cotton으로 하여 Core 공급속도비 (1.06, 1.10, 1.14), 연계수(T/M, 3.8, 4.0, 4.2), Sheath/Core 혼섬율(70/30, 60/40, 50/50)에 따라 제조하였다. 추가로 Core 방적사는 Sheath에 Cotton 대신 FR-Rayon과 선염 Cotton을 사용하여 각각 Sheath/Core 혼섬율 70/30의 비율로 방적사를 제조하여 다양한 소재에 따른 방적사의 물성을 측정하였다. 제조된 시험 원사들의 측정 물성은 번수(Ne), 균제도(U%), 사결점(IPI), 강력(cN), 신도(%), 비강도(cN/Tex) 등이며, 편직을 통해 편성물의 외관을 확인하였다. Ring 방적사의 경우 p-Aramid의 혼용율이 증가할수록 강도는 완만하게 증가한 반면, 신도는 급격하게 감소하였다. Cotton Core 방적사의 경우는 공급속도비가 높아질수록 균제도가 높아지는 것을 볼수 있었고, Core 공급속도비가 높아질수록 외관상 피복도는 높아진 것을 볼 수 있었다. 이렇게 연구된 Aramid 소재를 이용한 방적사 제조 공정조건변화에 따른 물성 및 피복도 결과는 기존 방적업체에서 Aramid를 이용한 방적사 제조시에 공정조건을 확보하는데 도움이 될 것이라 생각되며, 방적사 시제품 생산시에 발생할 수 있는 시행착오를 줄임으로써 시제품 제조를 위한 생산비용의 Loss를 절감할 수 있을 것으로 예상된다.

• 한국재료학회지
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• 제15권1호
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• pp.37-41
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• 2005

Stainless steel fibers with a diameter of $17\;{\mu}m$ and 630 nm were produced from stainless steel wires by the drawing/annealing/exfolitation process. The suitable sheath material to draw the core stainless steel wires to fibers was the Cu coating. The low melting metal of Zn was not a suitable sheath coating. Also, an attempt was made to produce $20\;{\mu}m{\Phi}Ti$ fibers from the core titanium wires. The main obstacles in producing Ti fibers were their resistance to deformation owing to the Ti's hop structure, and high reactivity of Ti with the exfolitation solution.

• 한국염색가공학회:학술대회논문집
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• 한국염색가공학회 2011년도 제45차 학술발표회
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• pp.52-52
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• 2011

PLA 섬유는 폴리머의 주성분이 옥수수에서 추출한 모노머를 중합한 화학섬유가 아닌 인체친화적인 식물성 소재이며 생분해성이 좋은 친환경 소재로 최근 주목받고 있는 섬유소재이다. 본 연구에서는 아토피완화용 여러 섬유 구조체 개발에서 사용되는 섬유소재중 PLA 원사에 항균성 물질을 혼입하여 PLA 항균사 제조를 위한 연구를 수행하였다. PLA Grade의 점도가 낮아질수록 Grade별 용융 지수값은 차이를 나타내지만 방사온도 $230^{\circ}C$를 변곡점으로 하여 용융점도가 급격히 변하였으며, 특히 방사온도 $240^{\circ}C$의 경우 용융지수가 100을 넘어가고 폴리머의 색깔이 황갈색을 띄어 폴리머의 열분해가 많이 일어났을 것으로 판단되었다. PLA의 적정 방사온도 구간은 $210{\sim}225^{\circ}C$ 구간이 최적이며 그 이상에서는 Color 변화 및 물성 저하가 나타나는 것으로 판단되었다. 항균성 PLA 섬유를 제조하기 위하여 피톤치드계 유기항균제를 이용하였으며, 피톤치드에 기능성 엘라스토머를 사용하여 Capsulation을 진행하였다. 이러한 유기항균제 Powder의 경우 비중이 낮아 표면적로 인하여 마스터배치 칩을 만드는 공정에서 잘 혼합되지 않는 문제점이 발생하였으나, 피톤치드의 함량을 조절하여 PLA와의 마스터배치 칩 제조를 시험하였다. 압출온도와 토출량, Screw 조건(Mixing, Zone)을 시험하여 적정 조건을 설정하였다. 항균사 PLA 섬유는 Sheath/Core 복합방사 형태와 단독사 형태의 2가지 Type을 제조하였다. Sheath/Core 복합방사 폴리머 구성은 Sheath부에 PLA항균사, Core부에 PLA 또는 저융점 PET를 사용하였다. Core부의 폴리머는 제사성에 큰 영향을 미치지 않았으나, 항균 마스터배치의 함량이 증가할수록 Pack압 상승이 급격히 일어나는 단점이 나타났다. 항균제 5% 정도가 혼입되어 있는 경우에 2.1 이상의 정균활성치와 99.8% 정도의 정균감소율 성능을 나타내었다. PLA 단독사의 경우, 항균제 최적 함량은 3% 이상으로 정균활성치 5.5 이상, 정균감소율 99.9%의 우수한 항균특성을 나타내었다.

• 한국염색가공학회지
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• 제24권2호
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• pp.113-120
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• 2012

Jacquard floor covering could be prepared from low-melting/regular sheath-core hybrid polyester, where the fiber is dyed in yarn state. With regard that the expected high shrinkage of the hybrid polyester in water makes problems in yarn dyeing, low-temperature dyeing properties of the hybrid polyester were studied. The rate of shrinkage of low-melting hybrid polyester exceeds 9% in hot water above $90^{\circ}C$, at such condition, cheese yarn dyeing is very difficult. Although disperse dyes exhaust in a relatively high speed on low-melting hybrid polyester, diffusion of these dyes to the core regular polyester was extremely slow under $90^{\circ}C$. Foron Blue E-BL 150, an anthraquinone E-type disperse dye, showed appreciable diffusion after 48hrs dyeing at $90^{\circ}C$. The fastness to rubbing and drycleaning were improved by one grade after reduction cleaning.

• 한국염색가공학회지
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• 제17권3호
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• pp.26-33
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• 2005

EVA microsphere was prepared by a thermally induced phase separation. EVAL microsphere was made by a saponification on sheath of EVA microsphere. And microcapsule with EVA core-PU shell structure was synthesized by interfacial polymerization using diisocyanates with PEG in gelatin aqueous solution as the stabilizing agent. The effects of chemical structure of diisocyanate on the average particle size and distribution, morphology, color strength and friction fastness of core-shell particles were investigated to design microcapsule. The friction fastness of the fabrics printed with EVA core-PU shell microcapsules had the 4-5 grade.

• International Journal of Concrete Structures and Materials
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• 제9권3호
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• pp.369-379
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• 2015

Friction in a post-tensioning system has a significant effect on the distribution of the prestressing force of tendons in prestressed concrete structures. However, attempts to derive friction coefficients using conventional electrical resistance strain gauges do not usually lead to reliable results, mainly due to the damage of sensors and lead wires during the insertion of strands into the sheath and during tensioning. In order to overcome these drawbacks of the existing measurement system, the Smart Strand was developed in this study to accurately measure the strain and prestressing force along the strand. In the Smart Strand, the core wire of a 7-wire strand is replaced with carbon fiber reinforced polymer in which the fiber Bragg grating sensors are embedded. As one of the applications of the Smart Strand, friction coefficients were evaluated using a full-scale test of a 20 m long beam. The test variables were the curvature, diameter, and filling ratio of the sheath. The analysis results showed the average wobble and curvature friction coefficients of 0.0038/m and 0.21/radian, respectively, which correspond to the middle of the range specified in ACI 318-08 in the U.S. and Structural Concrete Design Code in Korea. Also, the accuracy of the coefficients was improved by reducing the effective range specified in these codes by 27-34 %. This study shows the wide range of applicability of the developed Smart Strand system.

• 한국의류산업학회지
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• 제17권2호
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• pp.287-294
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• 2015

This study investigates the physical properties of Murata Vortex Spinning (MVS) blended yarn with yarn count(20's, 30's, 40's) and blend ratio(Polyester 100, Polyester70:Cotton30, Polyester50:Cotton50, Polyester30:Cotton70, and Polyester50:Tencel40:Cotton10). This study evaluated tenacity, elongation, bending rigidity, bending hysteresis, hairiness coefficient, irregularity and twist number. The structure of MVS blended yarn influenced stress, strain, bending rigidity, bending hysteresis and the hairiness coefficient of MVS blended yarn decreased as the yarn count increased. MVS blended yarn consists of core and sheath. The core of MVS blended yarn is composed of a parallel fiber with a wrapping fiber that covers thecore fiber. This special structure of the MVS blended yarn effects the physical properties of the yarn; in addition, the mechanical properties of the component fibers influenced the stress, strain, bending rigidity, bending hysteresis and hairiness coefficient of MVS blended yarn with the blend ratio. Polyester decreases and cotton increases resulted in decreased physical properties. A similar polyester content increased the tencel and physical properties. Appropriate physical properties and a variety of touch expression can be realized through a correct blend ratio.

• 한국전기전자재료학회논문지
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• 제14권6호
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• pp.499-504
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• 2001

We evaluated the degree of texture through depth of the superconductor core of Bi-Sr-Ca-Cu-O(BSCCO) superconductor tape. The degree of texture was characterized by pole figure analysis indicating that the degree of texture varied significantly with depth of the superconductor core. It was observed that the degree of texture was higher near the interface than inside the superconductor core. Specifically, as getting near to the center from the sheath/core interface, the orientation of BSCCO became dispersed from normal direction(ND) which, in turn, resulted in the degradation of <001>-fiber texture. In addition, the <001> texture was non-uniform an, better texture was developed along rolling direction(RD), compared to transverse direction(TD). Microstructural investigation showed that grain alignment was locally degraded by the existence of second phases. I was observed that larger grain size and better texturing were developed near the relatively straight interface compared to those inside the superconducting core. Based on our study, the region near the interface is thought to carry significant current compared to that inside the core.