의류용 Aramid/Wool/PET 혼방직물의 제조 및 물성에 관한 연구

양병진,남인우,김민선,Yeang, Byeong Jin,Nam, In Woo,Kim, Min Sun 한국섬유공학회 2014 한국섬유공학회지 Vol.51 No.3

Para-Aramid fibers are very tough and strong polymer materials. They are widely used for the manufacture of high-performance industrial textiles. In this study, we examined the effects of different concentrations of aramid staple fibers on the mechanical properties of wool/PET/aramid blended spun yarn and fabric. Three different fiber compositions were used to produce aramid fabrics with aramid fiber contents of 0-10%. We measured the mechanical properties of these aramid blended fabrics: the tensile strength, wear strength, and fastness against washing, friction, and daylight. The tensile test results demonstrated that the mechanical properties of the aramid blended fabric change with the amount of aramid staple fibers. In particular, 6% aramid blended fabrics showed the best physical properties, but higher aramid concentrations produced no further changes. One reason could be the decrease in mechanical properties due to the low cohesion stress of individual aramid fibers. In conclusion, a woven fabric made of 3-6% aramid staple fibers blended with spun yarn can increase the mechanical properties of apparel.

건·습 텍스쳐링 가공조건이 방호의류용 Aramid ATY와 Aramid/Nylon hybrid 사의 물성에 미치는 영향

박미라,김현아,김승진 한국의류산업학회 2013 한국의류산업학회지 Vol.15 No.3

This paper surveys the physical properties of aramid and aramid/nylon hybrid air-jet textured yarns(ATY) for protective garments according to wet and dry texturing conditions. Aramid and nylon filaments were used to make two kinds of para-aramid ATY and four kinds of aramid/nylon hybrid ATY with dry and wet treatments. The analyzed physical properties of six specimens (made on the ATY machine) are as follows. The tenacity and initial modulus of aramid and aramid/nylon hybrid ATY decreased with the wetting and breaking strain; however, the yarn linear density of aramid and hybrid ATY increased with wetting treatment. The dry and wet thermal shrinkage of the hybrid ATY increased with wetting. The stability of aramid and hybrid ATY also increased with wetting. The physical properties of core/effect type hybrid ATY showed significantly more change than the core type hybrid ATY and the physical properties of nylon/aramid core/effect hybrid ATY showedsignificantly more change than the of aramid/nylon core/effect hybrid ATY. A higher bulky and breaking strain of hybrid ATY require ATY processing conditions of nylon on the core part with wetting and aramid on the effect part. ATY processing conditions for nylon and aramid on the core part with wetting are required for a higher tenacity and modulus. ATY processing conditions of nylon and aramid on the core with no wetting are required for a low thermal shrinkage.

연구논문 : 건,습 텍스쳐링 가공조건이 방호의류용 Aramid ATY와 Aramid/Nylon hybrid 사의 물성에 미치는 영향

박미라 ( Mi Ra Park ),김현아 ( Hyun Ah Kim ),김승진 ( Seung Jin Kim ) 한국의류산업학회 2013 한국의류산업학회지 Vol.15 No.3

This paper surveys the physical properties of aramid and aramid/nylon hybrid air-jet textured yarns(ATY) for protective garments according to wet and dry texturing conditions. Aramid and nylon filaments were used to make two kinds of para-aramid ATY and four kinds of aramid/nylon hybrid ATY with dry and wet treatments. The analyzed physical properties of six specimens (made on the ATY machine) are as follows. The tenacity and initial modulus of aramid and aramid/nylon hybrid ATY decreased with the wetting and breaking strain; however, the yarn linear density of aramid and hybrid ATY increased with wetting treatment. The dry and wet thermal shrinkage of the hybrid ATY increased with wetting. The stability of aramid and hybrid ATY also increased with wetting. The physical properties of core/effect type hybrid ATY showed significantly more change than the core type hybrid ATY and the physical properties of nylon/aramid core/ effect hybrid ATY showedsignificantly more change than the of aramid/nylon core/effect hybrid ATY. A higher bulky and breaking strain of hybrid ATY require ATY processing conditions of nylon on the core part with wetting and aramid on the effect part. ATY processing conditions for nylon and aramid on the core part with wetting are required for a higher tenacity and modulus. ATY processing conditions of nylon and aramid on the core with no wetting are required for a low thermal shrinkage.

Nylon/아라미드 원사특성이 방호의류용 에어텍스쳐사의 물성에 미치는 영향

김현아 ( Hyun Ah Kim ) 한국감성과학회 2014 감성과학 Vol.17 No.3

본 연구는 에어제트텍스쳐링 장치에서 공급되는 코어사와 이펙트사인 아라미드와 나일론의 구성이 방호의류용 아라미드/나일론 ATY와 아라미드 ATY의 물성변화에 대한 연구이다. 아라미드 필라멘트 표면의 매끄러움 때문에 아라미드 ATY의 강도 저하는 나일론 ATY에 비해 훨씬 높았다. 아라미드/나일론 ATY 강도는 ATY의 이펙트사인 나일론의 강도에 가장 영향을 많이 받았다. 나일론 ATY의 절단신도는 에어제트텍스쳐링 이전의 나일론에 비해 두 배정도 높은 값을 나타내었으며, 아라미드 ATY와 아라미드/나일론 ATY는 에어제트텍스쳐링 이전에 비해 5.9~6.7배 정도로 높았다. 아라미드 ATY의 초기탄성률은 아라미드의 에어제트텍스쳐링 이전에 비해 86.5%정도 감소하였으며, 아라미드/나일론 ATY의 초기탄성률은 아라미드 ATY와 나일론 ATY 초기탄성률의 산술평균치를 나타내었다. 아라미드/나일론 하이브리드 ATY의 습·건열 수축률은 나일론의 영향을 받음을 알 수 있었다. This study investigated the physical properties of aramid/nylon ATY and aramid ATY for protective garments according to the aramid and nylon characteristics fed on the core and effect components of air jet texturing equipment. Tenacity decrease of aramid ATY was much more higher than that of nylon ATY because of slick aramid filament surface. Tenacity of aramid/nylon ATY was most affected by the tenacity of nylon on the effect component of ATY. Breaking strain of nylon ATY was two times higher than that of nylon before air texturing, then, in case of aramid ATY and aramid/nylon ATY, were 5.9-6.7 times higher than those before air texturing. Initial modulus decrease of aramid ATY showed 86.5% of initial modulus of aramid before air texturing, then aramid/nylon hibrid ATY showed arithmetic average value of initial modulus of aramid and nylon ATY. Wet and dry thermal shrinkages of aramid/nylon hybrid ATY were dominated by those of nylon filament the effect component of ATY.

연구논문 : ATY 노즐 직경에 따른 방호의류용 아라미드와 아라미드/나일론 하이브리드 ATY사의 물성변화

최라희 ( La Hee Choi ),김현아 ( Hyun Ah Kim ),김승진 ( Seung Jin Kim ) 한국의류산업학회 2013 한국의류산업학회지 Vol.15 No.3

This paper investigates the physical properties of aramid and aramid/nylon hybrid air jet textured filaments for protective garmentsrelative to ATY nozzle diameters. Three types of para-aramids(840d, 1,000d, 1,500d) and nylon(420d) filaments were prepared; in addition, 840d aramid/420d nylon and three kinds of aramid filaments were texturized with a variation of air jet nozzle diameters(0.6, 0.75, 1 and 1.2 mm) on the AIKI air jet texturing machine. The measured physical properties of 16 specimens are as follows. The linear densities of aramid and aramid/nylon hybrid ATY increased with a larger nozzle diameter. The tenacity and initial modulus of aramid and hybrid ATY linearly decreased with a larger nozzle diameter; in addition, the breaking strain increased with the nozzle diameter. The dry and wet thermal shrinkage of hybrid ATY increased with a larger nozzle diameter from 0.6 mm to 1 mm and then decreased at a nozzle diameter of 1.2 mm (which seems to be a critical diameter). The wet and dry thermal shrinkage of aramid/nylon hybrid ATY are influenced by the nylon part of the hybrid yarns because the wet and dry thermal shrinkages of aramid ATY are less than 0.2%. The instabilities of aramid and aramid/nylon hybrid ATY were not influenced by the air jet nozzle diameter; however, they increased with the linear density of ATY.

방염작업복용 재활용 아라미드/면 혼방 직물의 역학 특성 및 쾌적성

송영경,백영미,전설희,성은지,장병율,안승국 한국섬유공학회 2017 한국섬유공학회지 Vol.54 No.6

As the use of high-performance and highly functional industrial fibers has rapidly increased, the amount of the resulting fiber waste has also risen. The purpose of this study was to develop methods for recycling aramid/cotton-blend fabric and characterize its use in flame retardant work clothes. For this purpose, we investigated its properties through Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and thermogravimetric analysis (TGA), and performed a comparative analysis of the mechanical properties of the fabric with a KES-FB system. The recycled fabric retained the properties of both the cotton and aramid fibers. When compared with pure aramid fabric, the recycled aramid/cotton-blend fabric was more flexible, had a higher Qmax and thermal conductance, and a similar level of water vapor permeability. These results indicate that the recycled aramid/cotton fabric is comfortable to wear. This study also established a database that can be referenced for the utilization of recycled, aramid/cotton-blend fabrics in flame retardant work clothes.

Experimental and analytical assessment of SRF and aramid composites in retrofitting RC columns

Dang, Hoang V.,Shin, Myoungsu,Han, Sang Whan,Lee, Kihak 테크노프레스 2014 Earthquakes and structures Vol.7 No.5

This research aimed to investigate retrofitting methods for damaged RC columns with SRF (Super Reinforced with Flexibility) and aramid composites and their impacts on the seismic responses. In the first stage, two original (undamaged) column specimens, designed to have a flexural- or shear-controlled failure mechanism, were tested under quasi-static lateral cyclic and constant axial loads to failure. Afterwards, the damaged column specimens were retrofitted, utilizing SRF composites and aramid rods for the flexural-controlled specimen and only SRF composites for the shear-controlled specimen. In the second stage, the retrofitted column specimens were tested again under the same conditions as the first stage. The hysteretic responses such as strength, ductility and energy dissipation were discussed and compared to clarify the specific effects of each retrofitting material on the seismic performances. Generally, SRF composites contributed greatly to the ductility of the specimens, especially for the shear-controlled specimen before retrofitting, in which twice the deformation capacity was obtained in the retrofitted specimen. The shear-controlled specimen also experienced a flexural failure mechanism after retrofitting. In addition, aramid rods moderately fortified the specimen in terms of the maximum shear strength. The maximum strength of the aramid-retrofitted specimen was 12% higher than the specimen without aramid rods. In addition, an analytical modeling of the undamaged specimens was conducted using Response-2000 and Zeus Nonlinear in order to further validate the experimental results.

Aramid섬유시트를 사용한 철근콘크리트 보의 휨보강 효과에 관한 실험적 연구

하경민 ( Ha Kyong-min ),김은겸 ( Kim Eun Kyum ),박재만 ( Park Jae Man ) 한국구조물진단유지관리공학회 1998 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.2 No.2

Due to the recent increase of hostile environments and traffic volume, premature failures of concrete structures cause the deterioration of serviceability and durability of structures. It is necessary to develop appropriate repair and strengthening materials and adequate methods of construction, in order to rehabilitate or even to improve the inherent serviceability and durability of an early-deteriorated concrete structures. In this study, it was experimentally investigated the effectiveness of repair and strengthening methods for the reinforced-concrete beams which was vulnerable to the sectional loss induced by delamination and the extensive cracks induced by bending. Non shrinkage mortar and polymer cement were employed to restore the sectional loss and aramid fiber-reinforced sheet was used to reinforce the surface subject to tension. Repaired and strengthened reinforced-concrete samples were subjected to loading tests. The tests revealed that the sectional restoration enhanced the loading capability of the sample structures. Additional strengthening with one aramid fiber-reinforced sheet improved 18% of yielding load and 30% of ultimate load of the structure. Reinforcing with two aramid fiber-reinforced sheets brought about an enhancement of 22% of yielding loading and 49% of ultimate load.

Preparation of EVOH and aramid-modified polar nylon membrane for the removal of hard and soft colloidal particles

Ayyavoo, Jayalakshmi,Kim, In-Chul,Kwon, Young-Nam Elsevier 2018 Journal of industrial and engineering chemistry Vol.65 No.-

<P><B>Abstract</B></P> <P>For the efficient particle removal in an aged semiconductor photoresist solution, a nylon membrane having micro-sized pores was modified into membranes having nano-sized pores. Polyethylene(co-vinyl alcohol) and aramid were used as pore fillers to modify the membrane. The removable capability of soft and hard nano-colloids was systematically investigated. Porosity minimization, improved rejection efficiency, solvent resistance, and enhanced wettability were observed at the modified nylon composite membranes. The aramid pore-filled membrane showed higher rejection (>95%) than the virgin or the EVOH modified membrane, showing good feasibility for use as a separator for particle removal in a semiconductor process.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The soft particles are called gel-like particles and gel agglomerates. </LI> <LI> Polyethylene(co-vinyl alcohol) (EVOH) and aramid (PA) were used as pore fillers. </LI> <LI> To modify the size/structure of the membrane pores and enhance the particle removal rate. </LI> <LI> Aramid modified nylon membrane showed higher rejection (>96%) than pure nylon membrane. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

소방관을 위한 아라미드 편직물의 잔염에 관한 연구

박평규,김로,노호성,김규호 한국위험물학회 2019 한국위험물학회지 Vol.7 No.2

The aim of this study was to investigate the cause of afterflame of fire hood, which was knitted with heat resistant aramid. Flame retardant property of aramid fiber would be lost during processing, so softener containing flame retardant should be used. Knitted fabric showed a tendency to decrease afterflame performance by increasing after washing. The softened fire-retardant fire hood a water repellent level 2, and the mini knitting machine showed a level 1, since it didn’t go through the post-treatment process. The oxygen limited index(LOI) of aramids were different with testing organism. Therefore, it’s believed that flame retardant treatment is essential for post processing of aramid knitted fabric.