• 폴리머
• /
• 제37권1호
• /
• pp.52-60
• /
• 2013

셀룰로오스 아세테이트(CA) 섬유를 $Na_2CO_3$ 용액으로 가수분해하여 탈아세테이트 반응시키면 레이온 섬유로 전환된다. 이때 처리조건을 조절함으로써 표면만 가수분해시켜, 표면은 레이온 성분이고 내부는 CA 성분으로 된 sheath-core형 표면가수분해 CA(SH-CA) 섬유를 얻었다. 시료들의 가수분해는 FTIR 스펙트럼 및 WAXD 패턴으로 분석하였으며, CA 성분을 아세톤으로 용출시킨 시료들의 SEM 사진으로부터 sheath-core 구조를 확인하였다. 이 sheath-core 형태의 SH-CA 섬유로 된 벨벳 직물을 사용하여, 액정디스플레이(LCD)용 폴리이미드 배향막을 러빙시키고 편광 FTIR 스펙트럼으로 분석하여 이 SH-CA 섬유 벨벳직물이 LCD용 러빙포로 사용될 수 있음을 확인하였다.

• Fibers and Polymers
• /
• 제5권1호
• /
• pp.25-30
• /
• 2004

The present paper reports the impact of thermal treatment on the characteristics of core-sheath type hybrid technical yarns. The core-sheath type hybrid yams are prepared using DREF-III technology. Polyester and glass multifilaments are used as core components whereas the cotton and polyester staple fibers are the sheath components wrapped around the core filament with different proportions to form a hybrid structure. The thermal treatment is carried out both in dry and in wet state under relaxed condition and the thermal shrinkage, sheath-slipping resistance and tensile and bending properties of hybrid yarns have been studied. Thermal treatment markedly increases the thermal shrinkage and sheath-slipping resistance of hybrid yarns with polyester multifilament in core, but insignificant effect for yarns with glass multifilament in core. Breaking elongation of hybrid yams with polyester multifilament in core increases with treatment temperature. The hybrid yarns with glass multifilament in core are least affected by thermal treatment.

• Macromolecular Research
• /
• 제16권1호
• /
• pp.21-30
• /
• 2008

Based on the sheath-core bicomponent composite fibers with modified polystyrene (PS) and the modified polypropylene (PP), composite fibers obtained were further cross-linked and sulphonated with chlorosulphonic acid to produce strong acidic cation ion exchange fibers. The structures of the fibers obtained were characterized using Fourier transform infrared (FT-IR) spectroscopy, differential scanning calorimetry (DSC) etc. The optimal technology of the fibers obtained is discussed. The static absorption capacity of the sheath-core bicomponent composite cation exchange fibers for $Zn^{2+}$, $Cu^{2+}$ was determined. The absorption kinetics and major factors affecting the absorption capacities of $Zn^{2+}$, $Cu^{2+}$ were studied, and its chemical stability and regenerating properties were probed. The results suggest that cation exchange fibers with better mechanical properties and higher exchange capability were obtained. Moreover, this type of ion exchange fiber has good absorption properties and working stability to various metal ions. Hence, they have higher practicability.

• 한국의류학회지
• /
• 제37권2호
• /
• pp.224-234
• /
• 2013

This study investigates the fabrication of core-sheath nanocomposite fibers by locating germanium (Ge) and silicon dioxide ($SiO_2$) nanoparticles selectively in the sheath layer by co-axial electrospinning. Co-axially spun fibers were prepared by electrospinning a pure PVA solution and Ge/$SiO_2$/PVA solution as the core and sheath layer, respectively. Core-sheath nanocomposite fibers were electrospun under a variety of conditions that include various feed rates for the core and sheath solutions, voltages, and concentric needle diameters, in order to find an optimum spinning condition. Ge/$SiO_2$ nanocomposite fibers were also prepared by uniaxial electrospinning to compare fiber morphology and nanoparticle distribution with core-sheath nanofibers. Using scanning electron microscopy, transmission electron microscopy, and energy dispersive X-ray analysis, it was demonstrated that the co-axial approach resulted in the presence of nanoparticles near the surface region of the fibers compared to the overall distribution obtained for uni-axial fibers. The co-axially electrospun Ge/$SiO_2$/PVA nanofiber webs have possible uses in high efficiency functional textiles in which the nanoparticles located in the sheath region provide enhanced functionality.

• 한국의류산업학회지
• /
• 제11권4호
• /
• pp.661-666
• /
• 2009

The purpose of this study is to analyze the dyeability of polyester(PET) fabric by thermal bonding with low melting component of bicomponent fiber and to describe the change of physical properties of thermal bonded PET fabrics. The PET fabrics were prepared with regular PET fiber as warp and bicomponent fiber as weft. The bicomponent fiber of sheath-core type was composed with a regular PET core and low melting PET sheath. The thermal bonding of PET fabric was carried out in pin tenter($195^{\circ}C$) for 60 seconds. In this study, we investigated the dye ability and fastness of the dyed PET fabric. Dye ability of E-type dyestuff is higher than S-type dyestuff. In the case of E- type dyestuff, the saturated dyeing time was 10minutes at $130^{\circ}C$. The washing fastness and light fastness were excellent as 4-5grade.

• 한국섬유공학회:학술대회논문집
• /
• 한국섬유공학회 1996년도 추계 학술발표회
• /
• pp.427-431
• /
• 1996

• 한국의류산업학회지
• /
• 제11권3호
• /
• pp.474-480
• /
• 2009

The purpose of this study is to prepare the hardness of polyester(PET) fabric by thermal bonding with low melting component of bicomponent fiber and to describe the change of physical properties of thermal bonded PET fabrics. The PET fabrics were prepared with regular PET fiber as warp and bicomponent fiber as weft. The bicomponent fiber of sheath-core type were composed with a regular PET core and low melting PET sheath. The thermal bonding of PET fabric was carried out in pin tenter from 120 to $195^{\circ}C$ temperature range for 60 seconds. In this study, we investigated the physical properties and melting behavior of PET fiber and the effect of the temperature of the pin tenter on the thermal bonding, mechanical properties. Melting peak of warp showed the thermal behavior of general PET fiber. However, melting peak of weft fiber(bicomponent fiber) showed the double melting peak. The thermal bonding of the PET fabric formed at about temperature of lower melting peak. The optimum thermal bonding conditions for PET fabrics was applied at $190{\sim}195^{\circ}C$ for 60seconds by pin tenter. On the other hand, the tensile strength of the PET fabric decreased with an increasing temperature of thermal bonding.

• 한국섬유공학회:학술대회논문집
• /
• 한국섬유공학회 1998년도 봄 학술발표회 논문집
• /
• pp.101-105
• /
• 1998

복합방사에 의해 복수의 성분을 단섬유내에 함유하고 있는 섬유를 복합섬유라 하며 복합섬유에는 천연섬유인 양모섬유가 있고, 합성섬유로는 sheath/core형, side-by-side형, 해도형 등의 다양한 형태의 섬유가 있다. 최초로 side-by-side형의 비스코스 섬유가 1937년에 발명 되었고, 이후 1960년대부터는 나일론 복합섬유가 양말ㆍ메리야스류, 부직포 제조의 용도로 사용되기 시작했고 최근에 와서는 극세섬유나 권축섬유 등 특수한 기능을 가진 섬유를 제조하기 위한 수단으로 sheath/core형을 비롯한 많은 형태의 복합섬유가 다양한 고분자의 조합으로 제조되고 있다[1].(중략)

• 한국섬유공학회:학술대회논문집
• /
• 한국섬유공학회 1998년도 가을 학술발표회논문집
• /
• pp.211-214
• /
• 1998

복합섬유의 용도는 그 기능에 따라서 다양하지만 그 중에서도 자기접착성을 살려서 부직포의 재료로 사용되는 예가 많다. 즉 sheath/core형 복합섬유 중 sheath 성분에 core 성분보다 융점이 낮은 폴리머를 사용하여 열융합에 의한 접착제로서의 역할을 담당하게 한 섬유가 전형적이다. 한편, 고속방사법은 방사과정 중에 섬유의 구조 형성을 현저하게 진행시키는 방사법이지만[1, 2], 복합섬유의 고속방사에 있어서는 각 구성성분이 서로 영향을 미치면서 세화ㆍ고화가 진행되므로 개개의 폴리머를 단독으로 방사하는 경우와는 다른 구조형성기구가 관여하는 것으로 알려져 있지만 아직 명확한 상호작용은 보고된 바가 없다. (중략)

• 한국의류학회지
• /
• 제41권1호
• /
• pp.84-97
• /
• 2017

Water vapor and thermal transmission properties of high emotional garments are important to evaluate wear comfort; in addition, the measuring methods of these properties are also critical for breathable and warm suit fabrics. In this study, the water vapor and thermal properties of composite yarn fabrics made of CoolMax, Tencel, and Bamboo fibers with filaments were measured and compared according to the measuring method. Water Vapor Transmittance (WVT) of the fabric woven by the sheath/core composite yarn in the warp direction was the highest due to the small staple fiber volume in the sheath/core yarn structure and high air voids in the sheath/core yarn fabrics. This property was also the highest in fabrics woven by bamboo staple yarns in the weft direction, and was the lowest on hi-multi filament fabrics. However, water vapor resistance ($R_{ef}$) of these fabrics by KSK ISO 11092 showed the opposite results to the water vapor transmittance method ($CaCl_2$ method); in addition, its correlation coefficient was low. The correlation coefficient between $R_{ef}$ and the drying rate was 0.719; therefore, the measurement mechanism of $R_{ef}$ is analogous to the drying property measurement. The thermal conductivity of the fabrics woven with compact staple yarn showed a high value; however, the hi-multi filament fabric showed low thermal conductivity. Therefore, fiber characteristics affect thermal properties more than yarn structure. The correlation between thermal property and moisture transport was also low. This study showed that: water vapor transmittance was active at the loose yarn structure, dry heat transport was vigorous at the compact yarn structure, and heat transport was affected more by fiber characteristics than yarn structure. In conclusion, sheath/core composite yarns were relevant to the high absorptive cool suit along with siro-fil and CoolMax/Bamboo staple yarns that were relevant to the heat diffusive cool suit.