• Title, Summary, Keyword: glass fiber

Search Result 1,641, Processing Time 0.038 seconds

THERMO-FLUID ANALYSIS ON THE HELIUM INJECTION COOLING OF GLASS FIBER FOR HIGH SPEED OPTICAL FIBER MANUFACTURING (광섬유 고속생산용 헬륨 주입식 유리섬유 냉각공정에 대한 열유동 해석)

  • Oh, I.S.;Kim, D.;Kwak, H.S.;Kim, K.
    • 한국전산유체공학회:학술대회논문집
    • /
    • /
    • pp.92-95
    • /
    • 2011
  • In manufacturing optical fibers, the process starts with the glass fiber drawing from the heated and softened silica preform in the furnace, and the freshly drawn glass fiber is still at high temperature when it leaves the glass fiber drawing furnace. It is necessary to cool down the glass fiber to the ambient temperature before it then enters the fiber coating applicator, since the hot glass fiber is known to cause several technical difficulties in achieving high quality fiber coating. As the fiber drawing speed keeps increasing, a current manufacturing of optical fibers requires a dedicated cooling unit with helium gas injection. A series of three-dimensional flow and heat transfer computations are carried out to investigate the effectiveness of fiber cooling in the fiber cooling unit. The glass fiber cooling unit is simplified into the long cylindrical enclosure at which the hot glass fiber passes through at high speed, and the helium is being supplied through several injection slots of rectangular shape along the cooling unit. This study presents and discusses the effects of helium injection rates on the glass fiber cooling rates.

  • PDF

Surface Modified Glass-Fiber Effect on the Mechanical Properties of Glass-Fiber Reinforced Polypropylene Composites

  • Park, Sanghoo;Kim, Su-Jong;Shin, Eun Seob;Lee, Seung Jun;Kang, Beom Mo;Park, Kyu-Hwan;Hong, Seheum;Hwang, Seok-Ho
    • Elastomers and Composites
    • /
    • v.54 no.3
    • /
    • pp.182-187
    • /
    • 2019
  • To improve the mechanical properties of glass-fiber-reinforced polypropylene (PP) composites through interfacial adhesion control between the PP matrix and glass fiber, the surface of the glass fiber was modified with PP-graft-maleic anhydride (MAPP). Surface modification of the glass fiber was carried out through the well-known hydrolysis-condensation reaction using 3-aminopropyltriethoxy silane, and then subsequently treated with MAPP to produce the desired MAPP-anchored glass fiber (MAPP-a-GF). The glass-fiber-reinforced PP composites were prepared by typical melt-mixing technique. The effect of chemical modification of the glass fiber surface on the mechanical properties of composites was investigated. The resulting mechanical and morphological properties showed improved interfacial adhesion between the MAPP-a-GF and PP matrix in the composites.

A study on the mechanical properties of reinforced Nylon66 for glass fiber type and its orientation (나일론66에서 유리섬유의 종류 및 애향에 따른 기계적 물성 연구)

  • Ryu, J.B.;Lyu, M.Y.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • /
    • pp.374-377
    • /
    • 2009
  • Glass fiber reinforced nylon has been used in many plastic industries. Mechanical properties of reinforced plastics depend upon types of glass fiber as well as loading of glass fiber. Tensile properties of glass fiber reinforced nylon66 have been studied for different glass fiber types and sizes. Types of glass fibers were circular and flat, and diameters were 7, 10, and 13 micrometers. Orientations of glass fibers in the matrix of nylon66 have been analyzed through X-ray CT. Tensile specimens were prepared by cutting out of square plates of $100{\times}100{\times}3mm$ with different angles such as 0, 45, and $90^{\circ}$ to the flow direction. As the loading of glass fiber increases to 45 wt% tensile strength increases up 2.5 times compare with neat nylon66. Anisotropic tensile strength has been observed and minimum tensile strength was measured in the specimen cut from perpendicular to the flow direction.

  • PDF

Dissolution Technology Development of E-Glass Fiber for Recycling Waste of Glass Fiber Reinforced Polymer

  • Lee, Suyeon;Kim, Woo Sik
    • Journal of the Korean Ceramic Society
    • /
    • v.56 no.6
    • /
    • pp.577-582
    • /
    • 2019
  • Recently, E-glass fiber is the one of most widely used ceramic fiber for aerospace fields. Recycling technology for waste of wind power blades is arising issue for reasons of low manageability and high cost of wastes. Though glass fiber is perfectly dissolved in hydrofluoric acid, low cost for recycling and harmless to human is important for recycling of blades. Chemically melted glass fiber will be used as different purpose like accelerator of hardening for shotcrete. In this study, dissolution process of glass fiber is tested in NaOH solution at low temperatures. In addition, difference in diameter reduction of glass fiber is observed by various alkali concentration and reaction times, treatment temperatures using FE-SEM.

STRENGTH OF GLASS FIBER REINFORCED PMMA RESIN AND SURFACE ROUGHNESS CHANGE AFTER ABRASION TEST

  • Lee, Sang-Il;Kim, Chang-Whe;Lim, Young-Jun;Kim, Myung-Joo;Yun, Suk-Dae
    • The Journal of Korean Academy of Prosthodontics
    • /
    • v.45 no.3
    • /
    • pp.310-320
    • /
    • 2007
  • Statement of the problem. The fracture of acrylic resin dentures remains an unsolved problem. Therefore, many investigations have been performed and various approaches to strengthening acrylic resin, for example, the reinforcement of heat-cured acrylic resin using glass fibers, have been suggested over the years. But problems such as poor workability, rough surface, poor adhesion of glass fiber resin complex are not solved yet. Purpose. The aim of the present study was to investigate the effect of short glass fibers on the transverse strength of heat-polymerized denture base acrylic resin and roughness of resin complex after abrasion test. Material and methods. To avoid fiber bunching and achieve even fiber distribution, glass fiber bundles were mixed with acrylic resin powder in conventional mixer with a non-cutting blade, to produce the glass fiber($10{\mu}m$ diameter, 3mm length, silane treated) resin composite. Glass fibers were incorporated at 0%, 3%, 6% and 9% by weight. Transverse strength were measured. After abrasion test, surface roughness was evaluated and scanning electron microscope view was taken for clinical application. Results. 1. 6% and 9% incorporation of 3mm glass fibers in the acrylic resin enhanced the transverse strength of the test specimens(p<0.05). 2. Before abrasion test, incorporation of 0%, 3%, 9% glass fiber in the resin showed no dirrerence in roughness statisticaly(p>0.05). 3. After abrasion test, incorporation of 0%, 3%, 6% glass fiber in the resin showed same surface roughness value statistically(p>0.05). 4. In SEM, surface roughness increased as the percentage of the fibers increased. 5. In the areas where glass fiber bunchings are formated, a remarkably high roughness was noticed. Conclusion. 6% and 9% addition of silane-treated short glass fibers into denture base acrylic resin increased transverse strength significantly. Before and after abrasion test, incorporation of 0%, 3%, 6% glass fiber in the resin showed same surface roughness value statistically.

Engineering Properties of Carbon Fiber and Glass Fiber Reinforced Recycled Polymer Concrete (탄소섬유 및 유리섬유로 보강한 재생 폴리머 콘크리트의 공학적 특성)

  • Noh, Jin Yong;Sung, Chan Yong
    • Journal of The Korean Society of Agricultural Engineers
    • /
    • v.58 no.3
    • /
    • pp.21-27
    • /
    • 2016
  • This study was performed to evaluate engineering properties of carbon and glass fiber reinforced recycled polymer concrete. Fiber reinforced recycled polymer concrete were used recycled aggregate as coarse aggregate, natural aggregate as fine aggregate, $CaCO_3$ as filler, unsaturated polyester resin as binder, and carbon and glass fiber as fibers. The compressive and flexural strength of carbon fiber reinforced recycled polymer concrete were in the range of 68~81.5 MPa and 19.1~21.5 MPa at the curing 7days. Also, the compressive and flexural strength of glass fiber reinforced recycled polymer concrete were in the range of 69.4~85.1 MPa and 19~20.1 MPa at the curing 7days. Abrasion ratio of carbon and glass fiber reinforced recycled polymer concrete were decreased 21.6 % and 11.6 % by fiber content 0.9 %, respectively. After impact resistance test, drop numbers of initial and final fracture were increased with increase of fiber contents. Accordingly, carbon fiber and glass fiber reinforced recycled polymer concrete will greatly improve the hydraulic structures, underground utilities and agricultural structures.

COMPUTATIONAL ANALYSIS ON THE COOLING PERFORMANCE OF GLASS FIBER COOLING UNIT WITH HELIUM GAS INJECTION (헬륨가스 주입식 유리섬유 냉각장치의 냉각성능 해석)

  • Oh, I.S.;Kim, D.;Umarov, A.;Kwak, H.S.;Kim, K.
    • Journal of computational fluids engineering
    • /
    • v.16 no.4
    • /
    • pp.110-115
    • /
    • 2011
  • A modern optical fiber manufacturing process requires the sufficient cooling of glass fibers freshly drawn from the heated and softened silica preform in the furnace, since the inadequately cooled glass fibers are known to cause improper polymer resin coating on the fiber surface and to adversely affect the product quality of optical fibers. In order to greatly enhance the fiber cooling effectiveness at increasingly high fiber drawing speed, it is necessary to use a dedicated glass fiber cooling unit with helium gas injection between glass fiber drawing and coating processes. The present numerical study features a series of three-dimensional flow and heat transfer computations on the cooling gas and the fast moving glass fiber to analyze the cooling performance of glass fiber cooling unit, in which the helium is supplied through the discretely located rectangular injection holes. The air entrainment into the cooling unit at the fiber inlet is also included in the computational model and it is found to be critical in determining the helium purity in the cooling gas and the cooling effectiveness on glass fiber. The effects of fiber drawing speed and helium injection rate on the helium purity decrease by air entrainment and the glass fiber cooling are also investigated and discussed.

Effect of fiber glass on the physical properties of denture base resins (화이버 글라스가 의치상 레진의 기계적 특성에 미치는 영향)

  • Park, Yeon-Kyung
    • Journal of Technologic Dentistry
    • /
    • v.35 no.2
    • /
    • pp.97-103
    • /
    • 2013
  • Purpose: The purpose of this study was to investigate the effect of addition of fiber glass on the physical properties of silanized fiber mesh and non silanized mesh of denture base resins. Methods: The denture base resins were used in this study heat curing acrylic resins(Vertex Rs, Lucitone 199, $20{\times}80mm$) and fiber glass(SES, Green B&D co., Ltd, $20{\times}80mm$) were used as reinforcement. The specimens were stored in distilled water at $37{\pm}2^{\circ}C$ for 72 hours before test. Bending strength and tensile strength were measured by an universal testing machine(Instron 4301, Instron Corp.). Penetration distribution on fiber was observed by scanning electron microscopy(JSM 840A, Jeol Ltd). Results: The bending strength and modulus were increased by 30% after adding fiber glass on denture base resins. Tensile strength showed significant increasing by adding fiber glass on denture base resins. Conclusion: In this study, Addition of silanized fiber in denture base resins were improved physical properties. we confirmed the fiber glass possibility of the replacement about conventional materials.

Effects of Injection Molding Conditions on the Mechanical and Visco elastic Properties of Glass Fiber Reinforced Thermoplastics (I) -Glass Fiber Reinforced Nylon 6 Composite- (유리섬유강화 열가소성 수지의 제조조건이 기계적 및 점탄성적 성질에 미치는 영향(I) -유리섬유 보강 나일론 6 복합재료-)

  • 홍성일;조원호
    • Textile Science and Engineering
    • /
    • v.20 no.4
    • /
    • pp.38-48
    • /
    • 1983
  • The effects of glass fiber content and injection pressure on the mechanical and dynamic mechanical properties of glass fiber reinforced nylon 6 plastics were studied. On increasing glass fiber content, the fiber orientation, initial modulus, storage modulus and glass transition temperature increased, but the total energy dissipation in the glass transition region decreased. It was also found that the fiber orientation and the modulus had a maximum value at some critical injection pressure as the injection pressure increased. The reversed tendency was found in total energy dissipation.

  • PDF

A Study on the Physical Properties of Recycled Asphalt Mixtures Using Glass Fiber Reinforcement (유리섬유 보강재를 이용한 재활용 아스팔트 혼합물의 물리적 특성에 관한 연구)

  • Park, Ki Soo;Yoo, Pyeong Jun
    • International Journal of Highway Engineering
    • /
    • v.20 no.4
    • /
    • pp.27-34
    • /
    • 2018
  • PURPOSES : The objective of this study is to evaluate the physical properties of recycled asphalt mixtures reinforced with glass fiber. METHODS : Firstly, mixing design was conducted on recycled asphalt mixture for use of 50% recycled aggregate. Various laboratory tests were performed on four types of recycled asphalt mixtures with different glass fiber content to evaluate the physical properties. The laboratory tests include indirect tensile strength test, dynamic modulus test, Hamburg wheel tracking test and tensile-strength ratio to evaluate cracks, rutting and moisture resistance of mixtures. RESULTS : The indirect tensile strength of fiber reinforced glass increased about 139.4%. As a result of comparing the master curves obtained by the dynamic modulus test, the elasticity was low in the low temperature region and high in the high temperature region when the glass fiber was reinforced. The glass fiber contents of PEGS 0.3%, Micro PPGF 0.1% and Macro PPGF 0.3% showed the highest moisture resistance and rutting resistance. CONCLUSIONS : The test results show that use of glass fiber reinforcement can increase the resistance to cracking, rutting, and moisture damage of asphalt mixtures. It is also necessary to validate the long-term performance of recycled asphalt mixtures with glass fiber using full scale pavement testing and field trial construction.