Korea Institute for Knit Industry

Iksan, South Korea

Korea Institute for Knit Industry

Iksan, South Korea

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Lee B.O.,Korea Institute for Knit Industry | Ko J.A.,Korea Institute for Knit Industry | Han S.W.,City.com
Advanced Materials Research | Year: 2010

Melt blowing(MB) is a process for producing fibrous webs or articles directly from polymers or resins using high-velocity air or another appropriate force to attenuate the filaments. This process is one of the newer and least developed nonwoven processes. This process is unique because it is used almost exclusively to produce microfibers rather than fibers the size of normal textile fibers. MB microfibers generally have diameters in the range of 2 to 4 μm, although they may be as small as 0.1 μm and as large as 10 to 15 μm. The material acoustic property for noise absorption is principally based on the efficiency of material structures for damping sound wave reflections. In this paper, the sound absorbing material was designed with three layer composite sturcture. Sound absorbing material with fine meltblown(0.5-3 μm, 80%) and high modulus hollow fiber(30 μm, 20%) as a surface layer and bulky non-woven(15-30 μm) as middle layer, meltblown(3-10 μm) as bottom layer were manufactured. Their noise absorption were measured using the acoustic duct instrurment. The effect of the sound absorbing on the properties of PP/PET bico MB webs was investigated including the fiber diameter, weight, thickness and air permeability. © (2010) Trans Tech Publications.


Yun H.,Seoul National University | Kim M.K.,Seoul National University | Kwak H.W.,Seoul National University | Lee J.Y.,Seoul National University | And 3 more authors.
Fibers and Polymers | Year: 2013

Sericin (SS) is a protein that is secreted by silkworms, but it is usually discarded during the degumming process. To obtain and make use of the sericin, we prepared sericin/glycerol/graphene oxide nanocomposite film. The inherent brittleness of pure sericin film was improved by the addition of glycerol (Glc) as a plasticizer. To compensate for the reduced stiffness, we added graphene oxide (GO) into the SS/Glc film. At concentrations of up to 0.8 wt% relative to SS, GO dispersed evenly in the SS matrix without any agglomeration. The maximum tensile strength (9.5±0.7 MPa) and Young's modulus (414.4±23.2 MPa) were obtained when the GO content was 0.8 wt% relative to SS. The elongation of SS/Glc/GO nanocomposite film also increased by approximately 40 % compared to SS/Glc film. The strong interfacial interaction between the SS and the GO was responsible for the increased stiffness. The increased elongation was due to the reduced crystallinity of the sericin matrix in the presence of GO. © 2013 The Korean Fiber Society and Springer Science+Business Media Dordrecht.


Lee J.Y.,Seoul National University | Oh S.J.,Hyosung RandDB Labs | Lee M.S.,Hyosung RandDB Labs | Park J.Y.,Polychrom | And 2 more authors.
Fibers and Polymers | Year: 2012

Phytoncide, a volatile essential oil produced by plants and trees, has not only anti-microbial activity, but also a stress relieving effect. We prepared a sheath/core type melt-spun fiber that releases phytoncide for a prolonged time. The fiber is comprised of a nylon sheath and a polypropylene (PP) core material. Phytoncide-containing microcapsules are embedded within the core part. The phytoncide microcapsule-containing nylon/PP sheath/core (M-Ny/PP) fiber has suitable mechanical properties for textile application. The phytoncide release from the microcapsule-containing the PP fiber (M-PP) reached a plateau level after 4 days and maintained that level for an additional 7 days, indicating a zero-order release after the initial burst. The M-Ny/PP fiber emitted the volatile phytoncide even though the fiber was spun at 250 °C. The release of phytoncide decreased in the M-Ny/PP fiber compared to the phytoncide microcapsule-containing PP (M-PP) fiber due to the dense sheath layer. © 2012 The Korean Fiber Society and Springer Science+Business Media Dordrecht.


Kwon O.-H.,Korea Institute for Knit Industry | Kim H.-C.,Chungwoon University
Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry | Year: 2013

Hanji has been used mainly for preservation paper because of superior mechanical properties. However, it was not used in printing for inkjet and laser printer-printed letters. In this study, machine-made Hanji was prepared with five different contents of paper mulberry 20,40, 60, 80 and 100% and managed by same pressure calendering. By increasing of paper mulberry contents, tearing index and folding endurance of machine-made Hanji increased because of increased fiber-to-fiber bonding. Printability property of machine-made Hanji improved by decreasing of paper mulberry contents. After 20 hours accelerated aging, the initial folding endurance of machine-made Hanji was reduced by approximately one-fourth degree. Between 40 and 100% contents of paper mulberry was showed similar levels about preservation property. The machine-made Hanji of paper mulberry 60% content was suitable for permanence and printability properties using preservation paper and printer-printed letters.


Liu Y.,Chonbuk National University | Park M.,Chonbuk National University | Shin H.K.,Inha University | Pant B.,Chonbuk National University | And 5 more authors.
Journal of Industrial and Engineering Chemistry | Year: 2014

Poly(vinyl alcohol) (PVA)/chitosan (CS)/graphene oxide (GO) biocomposite nanofibers have been successfully prepared using aqueous solution by electrospinning. CS colloidal gel in 1% acetic acid can be changed to homogeneous solution by using electron beam irradiation (EBI). The uniform distributions of GO sheets in the nanofibers were investigated by field emission scanning electron microscopy (FESEM) and Raman spectroscopy. FESEM images illustrated that the spread single GO sheet embedding into nanofibers was formed via self-assembly of GO sheet and PVA/CS chains. And the average diameters of the biocomposite nanofibers decreased (200, 173, 160 and 123. nm) with increasing the contents of GO (0.05, 0.2, 0.4 and 0.6. wt%). Raman spectra verified the presence of GO in the biocomposite nanofibrous mats. The mechanical properties of as-prepared materials related with GO contents. It revealed that the highest tensile strength was 2.78. MPa, which was 25% higher than that of neat PVA/CS nanofibers. Antibacterial test demonstrated that the addition of GO to PVA/CS nanofiber had great ability to increase inhibition zone till 8.6. mm. Overall, these features of PVA/CS/GO nanofibers which were prepared by eco-friendly solvent can be a promising candidate material in tissue engineering, wound healing and drug delivery system. © 2014 The Korean Society of Industrial and Engineering Chemistry.


Kim H.-A.,Korea Institute for Knit Industry | Kim S.-J.,Yeungnam University
Fibers and Polymers | Year: 2011

The purpose of this study is to objectively evaluate the seam pucker as a fabric formability and to analyze the effects of the fabric structural and sewing parameters to the seam pucker properties of the worsted and wool/polyester blend fabrics. The seam pucker of the worsted and wool/polyester blend fabrics according to the different types of fibre composition were surveyed by measuring fabric mechanical property using KES-FB and FAST systems and also seam puckering test was conducted by objective and subjective methods. In addition, the effects of fabric structural and sewing parameters to the seam pucker were investigated using statistical analysis. It was revealed that the effects of fabric structural parameters to the seam pucker were dominant than those of sewing machine conditions. It was shown that low pressor foot pressure and shuttle tension make good seam pucker, and high sewing speed and shuttle tension make bad seam pucker. And it was also shown that the precision on estimating of the seam pucker by KES-FB system was much higher than that of FAST system. And seam pucker values between objective and subjective methods showed good correlation. © 2011 The Korean Fiber Society and Springer Netherlands.


Park Y.W.,Chonbuk National University | Park Y.W.,Korea Institute for Knit Industry | Song I.J.,Uno and Company Co. | Kim H.C.,Chonbuk National University
Fibers and Polymers | Year: 2014

As PET (Polyester) fiber has better heat resistance than PVC fiber or modacryl fiber, it has been used as wig fiber for human hair alternatives. However, PET is heavier and has higher specific gravity than human hair, and therefore the authors attempted to make lighter wig fiber by blending PP (polypropylene) into PET by mixing the PET/PP blend with a compatibilizer, a ethylene-acrylic ester-GMA(EAG) component grafted material, to overcome poor compatibilities of PET and PP. The thermal properties of the PET/PP blend mixed with EAG were measured using DSC, and the results showed that EAG affected melting point and crystallization temperature of the blend polymer. As blend ratio of PP increased, specific gravity of blend fiber reduced and thermal shrinkage rate increased. Blend ratio of PP was greater for shorter lengths of initial curl, although curl loosening increased as time elapsed. © 2014 The Korean Fiber Society and Springer Science+Business Media Dordrecht.


Kim H.-C.,Korea Institute for Knit Industry | Chung Y.S.,Chonbuk National University
Fibers and Polymers | Year: 2013

Chitin and chitosan have been extensively investigated as a matrix of organic/inorganic composite. Barium, one of the radiopaque inorganic materials, can provide chitosan with radiopaque property by blending of chitosan and BaSO4. The filtered and deaerated chitosan/BaCl2 solutions were extruded into NaOH and Na2SO4 coagulation bath through a nozzle by gear pump. BaSO4 was synthesized by the reaction between BaCl2 and Na2SO4 in the coagulation bath, in which acidic chitosan solution was also solidified at the same time. In XRD, the introduction of BaSO4 into chitosan fibers reduced the inherent peak of chitosan fibers. In angiographic observation, chitosan/BaSO4 hybrid fibers exhibited the clear contrast images which become clear with an increase in BaSO4 content. © 2013 The Korean Fiber Society and Springer Science+Business Media Dordrecht.


Kwon O.-H.,Korea Institute for Knit Industry | Kim H.-C.,Korea Institute for Knit Industry
Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry | Year: 2011

This study was carried out to develop the automation bark peeling process of paper mulberry for making Hanji. Nowadays, almost raw material has been imported from south-east asia for making Hanji. Raw material dependence is very high for Hanji-making by low productivity in korea. This study is focused on the resolution for problem of bark peeling automation. Water and sand jet of compressed air was possible bark peeling for black bast fiber. The effect of removing black bast fiber increased the longer the steaming time. Also using drum of bark peeling showed that results under temperature 80°C and Rpm 50/min were best bark peeling and separating bast fiber from stem. The contents of holocellulose, lignin, ethanol-benzene extractives, and ash were 91.63∼95.55%, 1.4-2.0%, 1.12∼1.65%, and 1.4-4.3%, respectively. Chemical characteristics are similar between imported raw-material with drum bark.


Kwon O.-H.,Korea Institute for Knit Industry | Kim H.-C.,Korea Institute for Knit Industry
Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry | Year: 2012

Hanji made of mulberry fibers has the lower printability due to their long fiber length, the diffusible property of ink, and low smoothness. This study was carried out to analyze the physical and optical properties of machine-made Hanji controlled by the different contents of paper mulberry 20, 40, 60, 80 and 100%. In this study, the results of comparing machine-made Hanji controlled by the different contents of Paper mulberry with commercial paper and inkjet coated paper are as following: Tearing strength of machine-made Hanji is higher than domestic paper and inkjet coated paper. By increasing paper mulberry contents of machine-made Hanji appeared that tensile strength increased and smoothness gradually decreased. Printability of machine-made Hanji is less than domestic paper and inkjet coated paper. However, there were significant possibility to use for printing paper.

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