• Title, Summary, Keyword: glass fiber

Search Result 1,538, Processing Time 0.04 seconds

Fabrication and characterization of glass with E-glass fiber composition by using silica-alumina refused coal ore (사암계 석탄폐석을 활용한 E-glass fiber 조성의 유리 제조 및 특성)

  • Lee, Ji-Sun;Lim, Tae-Young;Lee, Mi-Jai;Hwang, Jonghee;Kim, Jin-Ho;Hyun, Soong-Keun
    • Journal of the Korean Crystal Growth and Crystal Technology
    • /
    • v.23 no.4
    • /
    • pp.180-188
    • /
    • 2013
  • The glass of E-glass fiber composition was fabricated by using refused coal ore which is obtained as by-product from Dogye coal mine in Samcheok. We used silica-alumina refused coal ore which has low carbon content relatively, and the amount of refused coal ore has been changed from 0 to 35 % in batch composition. E-glass was fabricated by the melting of mixed batch materials at $1550^{\circ}C$ for 2 hrs with different refused coal ore composition of 0~35 %. We obtained a transparent and clear glass with high visible light transmittance value of 81~84%, thermal expansion coefficient of $5.39{\sim}5.61{\times}10^{-6}/^{\circ}C$ and softening point of $851{\sim}860^{\circ}C$. The glass fiber samples were also obtained through fiberizing equipment at $1150^{\circ}C$, and tested chemical resistance and tensile strength to evaluate the mechanical property as a reinforced glass fiber of composite material. As the result, we identified the properties of E-glass fiber by using refused coal ore are plenty good enough compare to that of normal E-glass without refused coal ore, and confirmed the possibility of refused coal ore as for the raw material of E-glass fiber.

A Study on Properties of the Glass Fiber Reinforced PPS Composites for Automotive Headlight Source Module (자동차 전조등 광원 모듈용 유리섬유강화 PPS 복합재료 특성 연구)

  • Heo, Kwang-Yeol;Park, Sung-Min;Lee, Eun-Soo;Kim, Myung-Soon;Sim, Ji-Hyun;Bae, Jin-Seok
    • Composites Research
    • /
    • v.29 no.5
    • /
    • pp.293-298
    • /
    • 2016
  • In this paper, Glass Fiber Reinforced Thermoplastic (GFRTP) for automotive headlight source module was fabricated by compounding and injection molding using PPS (Poly Phenylene Sulfide) resin with glass fiber which has three cross section (round type, cocoon type, flat type). Tensile, flexural, impact properties were investigated on effect of cross section, glass fiber contents. And it was observed flatness, dimensional stability, fluidity depending on glass fiber cross section. As a result, flat glass fiber reinforced thermoplastic's mechanical properties were most excellent. Also, dimensional stability and flatness showed better results when using flat glass fiber.

Physical Properties of Glass Fiber Reinforced Nylon 6,6 and lonomer Blends (Glass Fiber로 강화된 Nylon 6,6 / Ionomer 블렌드의 물리적 특성)

  • 박광석;서광석
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • /
    • pp.536-539
    • /
    • 1999
  • Physical properties of glass fiber-reinforced nylon 6,6 and ionomer blends were investigated in variation of ionomer and glass fiber content. With the increase of ionomer content, tensile strength, impact strength and flexural strength decreased, whereas increasing glass fiber content, these properties were improves. Both permittivity and tan $\delta$ remain unchanged. Space charge distribution was investigated by PEA (Pulsed electroacoustic) method. Heterocharge was found in nylon 6,6 and 히ass fiber composites, whereas composites, whereas when ionomer is blended.

  • PDF

HELIUM CONCENTRATION DECREASE DUE TO AIR ENTRAINMENT INTO GLASS FIBER COOLING UNIT IN A HIGH SPEED OPTICAL FIBER DRAWING PROCESS (광섬유 고속인출공정용 유리섬유 냉각장치 내 공기유입에 의한 내부헬륨농도 저하현상 연구)

  • Kim, K.;Kim, D.;Kwak, H.S.;Park, S.H.;Song, S.H.
    • Journal of computational fluids engineering
    • /
    • v.15 no.4
    • /
    • pp.92-98
    • /
    • 2010
  • In a modern high speed drawing process of optical fibers, it is necessary to use helium as a cooling gas in a glass fiber cooling unit in order to sufficiently cool down the fast moving glass fiber freshly drawn from the heated silica preform in the furnace. Since the air is entrained unavoidably when the glass fiber passes through the cooling unit, the helium is needed to be injected constantly into the cooling unit. The present numerical study investigates and analyzes the air entrainment using an axisymmetric geometry of glass fiber cooling unit. The effects of helium injection rate and direction on the air entrainment rate are discussed in terms of helium purity of cooling gas inside the cooling unit. For a given rate of helium injection, it is found that there exists a certain drawing speed that results in sudden increase in the air entrainment rate, which leads to the decreasing helium purity and therefore the cooling performance of the glass fiber cooling unit. Also, the helium injection in aiding direction is found to be more advantageous than the injection in opposing direction.

An Experimental Study on Alkali-Silicate Reaction of Fiber Reinforced Concrete Containing Waste Glass (폐유리를 혼입한 섬유보강 콘크리트의 알카리-실리카 반응에 관한 실험적 연구)

  • Lee, Bong-Chun;Lee, Taek-Woo;Kwon, Hyuk-Joon;Lee, Jun;Park, Seung-Bum
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • /
    • pp.49-54
    • /
    • 2001
  • Using waste glass in concrete can cause crack and strength loss by the expansion of alkali-silica reaction(ASR). In this study, ASR expansion and properties of strength were analyzed in terms of brown waste glass content, and fibers(steel fiber, polypropylene fiber) and fiber content for reduction ASR expansion due to waste glass. In this accelerated ASTM C 1260 test of waste glass, pessimum content can not be found. Also, when used the fibers with waste g1ass, there is an effect on reduction of expansion and strength loss due to ASR between the alkali in the cement paste and the silica in the waste glass. Specially, adding 1.5 vol.% of steel fiber to 20% of waste glass the expansion ratio was reduced by 40% and flexural strength was developed by up to 110% comparing with only Waste glass ( $80^{\circ}C$ $H_{2}$ O curing).

  • PDF

Effect of Glass Fiber-Reinforced Connection on the Horizontal Shear Strength of CLT Walls

  • JUNG, Hongju;SONG, Yojin;HONG, Soonil
    • Journal of the Korean Wood Science and Technology
    • /
    • v.48 no.5
    • /
    • pp.685-695
    • /
    • 2020
  • The connection performance between cross-laminated timber (CLT) walls and support has the greatest effect on the horizontal shear strength. In this study, the horizontal shear performance of CLT walls with reinforced connection systems was evaluated. The reinforcements of metal bracket connections in the CLT connection system was made by attaching glass fiber-based reinforcement to the connection zone of a CLT core lamina. Three types of glass fiber-based reinforcement were used: glass fiber sheet (GS), glass fiber cloth (GT) and fiber cloth plastic (GTS). The horizontal shear strength of the fabricated wall specimens was compared and evaluated through monotonic and cyclic tests. The test results showed that the resistance performance of the reinforced CLT walls to a horizontal load based on a monotonic test did not improve significantly. The residual and yield strengths under the cyclic loading test were 38 and 18% higher, respectively, while the ductility ratio was 38% higher than that of the unreinforced CLT wall. The glass fiber-based reinforcement of the CLT connection showed the possibility of improving the horizontal shear strength performance under a cyclic load, and presented the research direction for the application of real-scale CLT walls.

Transverse permeability measurement of a circular braided preform in liquid composite molding

  • Chae, Hee-Sook;Song, Young-Seok;Youn, Jae-Ryoun
    • Korea-Australia Rheology Journal
    • /
    • v.19 no.1
    • /
    • pp.17-25
    • /
    • 2007
  • In liquid composite molding (LCM), composites are produced by impregnation of a dry preform with liquid resin. The resin flow through the preform is usually described by Darcy's law and the permeability tensor must be obtained for filling analysis. While the resin flow in the thickness direction can be neglected for thin parts, the resin flow in the transverse direction is important for thicker parts. However, the transverse permeability of the preform has not been investigated frequently. In this study, the transverse permeability was measured experimentally for five different fiber preforms. In order to verify the experimental results, the measured transverse permeability was compared with numerical results. Five different fiber mats were used in this study: glass fiber woven fabric, aramid fiber woven fabric, glass fiber random mat, glass fiber braided preform, and glass/aramid hybrid braided preform. The anisotropic braided preforms were manufactured by using a three dimensional braiding machine. The pressure was measured at the inlet and outlet positions with pressure transducers.

GLASS FIBER REINFORCED STRIP CROWN IN PRIMARY TEETH (강화형 strip crown의 사용)

  • Kim, Dae-Eop
    • JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY
    • /
    • v.32 no.1
    • /
    • pp.132-135
    • /
    • 2005
  • The purpose of this study was to propose the modified strip crown technique for esthetic restoration of primary anterior teeth using glass fibers. Celluloid crown form(3M, USA), Z100(P shade, 3M, USA). Aeliteflo(Bisco Inc., USA), and Clearfil SE Bond(Kuraray Medical Inc., Japan) were used for this technique. Mesh type of glass fiber(TESCERA Fiber Mesh, Bisco Inc, USA) was used for reinforcing material. After trimming the celluloid crown form, resin adhesive and flowable resin were applied on the pre-shaped glass fiber mesh. That mesh was placed on the lingual surface of inside of celluloid crown form and followed by light activation. Composite resin was filled into the celluloid crown form and put it on a prepared tooth and then light activated and finished the margin. The new modified strip crown technique can provide esthetics and increased durability for restoration of primary anterior teeth.

  • PDF

Fabrication and characterization of boron free E-glass fiber compositions (붕소를 함유하지 않는 E-glass fiber의 제조 및 특성에 대한 연구)

  • Lee, Ji-Sun;Lim, Tae-Young;Lee, Yo-Sep;Lee, Mi-Jai;Hwang, Jonghee;Kim, Jin-Ho;Hyun, Soong-Keun
    • Journal of the Korean Crystal Growth and Crystal Technology
    • /
    • v.23 no.1
    • /
    • pp.44-50
    • /
    • 2013
  • E-glass fiber is the most widely used glass fiber for reinforced composite materials of aircrafts, automobiles and leisure equipments. But recently researches are being progressed to reduce boric oxide from 8 % to 0 (zero), as is called 'Boron free E-glass', because of increasing material cost, environmental problem, and improving chemical resistance and mechanical properties of E-glass fiber. In this study, we fabricated the bulk glass and fiber glass of 'Boron free E-glass (BF) compositions', and characterized thermal properties and optical properties. 'Boron free E-glass (BF)' was obtained by the melting of mixed batch materials at $1550^{\circ}C$ for 2 hrs with different $Al_2O_3$ compositions 5~10 %. We obtained transparent clear glass with high visible light transmittance value of 81~86 %, and low thermal expansion coefficient of $4.2{\sim}4.9{\times}10^{-6}/^{\circ}C$ and softening point of $907{\sim}928^{\circ}C$. For the chemical resistance test of 'BF' fiber samples, we identified that the higher alumina contents gives the better corrosion resistance of glass fiber.

Mechanical Properties of Steel Fiber Reinforced Concrete Using Waste Glass (폐유리를 혼입한 강섬유보강 콘크리트의 역학적 특성)

  • 박승범;이봉춘
    • Journal of the Korea Concrete Institute
    • /
    • v.14 no.6
    • /
    • pp.1032-1039
    • /
    • 2002
  • Since recycling waste glass as a material for concrete has a great advantage environmentally and economically, the US, Japan and other countries have started recycling waste glass widely and accumulating the technology of manufacturing equipment and its construction. However, there is no practical data on the mechanical property of concrete using waste glass. In this study, the mechanical property of the steel fiber reinforced concrete using waste glass was analyzed in terms of waste glass content(20vo1. %, 40vo1. % as a part of fine aggregate) and steel fiber content(0.5~ 1.5vol.%). The results of this study are as follows : The workability of the concrete including steel fiber and waste glass decreases, as the inclusion rate of waste glass and steel fiber increases. The tensile strength, flexural strength and flexural toughness of the concrete including waste glass increase considerably, as the inclusion rate of steel fiber increases. From the results, the appropriate inclusion rate of steel fiber and waste glass is thought to be 1.0vol. % and 20vo1. %, respectively.