• Title/Summary/Keyword: Spinning

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Studies on Melt Spinning of PET Hollow Fibers

  • O Tae-Hwan;Lee Mu-Seok;Kim Sang-Yong;Sim Hyeon-Ju
    • Proceedings of the Korean Fiber Society Conference
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    • 1998.04a
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    • pp.111-115
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    • 1998
  • Fiber spinning is a continuous deformation process by which material is converted into a fiber. The melt spinning process was analyzed mainly by employing an asymptotic method of the so-called thin filament equations which formulates dynamics of spinning process by averaging over the cross-section of filament the set of fundamental equations. The method gives the approximate results for commonly used circular fiber spinning.(omitted)

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Structure Development and Dynamic Properties in High-speed Spinning of High Molecular Weight PEN/PET Copolyester Fibers

  • Im, Seung-Soon;Kim, Sung-Joong
    • Fibers and Polymers
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    • v.3 no.1
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    • pp.18-23
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    • 2002
  • The structure development and dynamic properties of fibers produced by high-speed spinning of P(EN-ET) random copolymers were investigated. The as-spun fibers were found to remain amorphous up to the spinning speed of 1500 m/min, and subsequent increases in speed resulted in the crystalline domains containing primarily $\alpha$ crystalline modification of PEN. The f modification was not found up to spinning speeds of 4500 m/min. On the other hand, annealing of constrained fibers spun at the 2100 m/min at 180,200, and 240^{\circ}C$ exhibited $\beta$-form crystalline structure, while the annealed fibers spun in 600-1500 m/min range exhibited dominantly $\alpha$-form. However $\beta$-form crystals disappeared above the spinning speed of 3000 m/min. With increasing spinning speeds from 600 to 4500 m/min, the storage modulus of as-spun fibers increased continuously and reached a value of about 10.4 spa at room temperature. The tan $\delta$curves showed the $\alpha$-relaxation peak at about 155-165^{\circ}C$, which is considered to correspond to the glass transition. The $\alpha$-relaxation peaks became smaller and broader, and shift to higher temperatures as the spinning speed increases, meaning that molecular mobility in the amorphous region is restricted by increased crystalline domain.

A Study On the Structure and Mechanical Properties of PP filament at Different Spinning speed and Draw ratio (방사속도 및 연신비 변화에 따른 Polypropylene filament의 구조와 물성에 관한 연구)

  • Lee, Eun-Woo;Cho, Kyu-Min;Cho, In-Sul
    • Journal of the Korean Society of Industry Convergence
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    • v.2 no.1
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    • pp.27-33
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    • 1999
  • Effects of spinning speed and draw ratio on structure and mechanical properties of PP filament. A The crystalline structure and mechanical properties of uniaxially deformed polypropylene filament has been examined by XRD, birefringence, UTM and density method. Uniaxially deformed PP filament was prepared of various spinning speeds (300, 600, 900m/min.) and draw ratio(x2, x3, x4). From the results of these studies, it found the following facts. Firstly, it was found that the crystallinity and crystallite size (110plane) of the samples were increased with increasing of spinning speed and draw ratio, especially, it was rapidly increased between as spun yarn and 2 times draw ratio. Secondly, birefringence value was increased with increasing of spinning speed and draw ratio. The mechanical properties of initial modulus, tensile strength were increased with increasing of spinning speed and draw ratio also, but the degree of elongation decreased as spinning speed and draw ratio.

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A Study of Fine Fiber Formation and Physical Properties of Polyacrylonitrile Copolymer (폴리아크릴로니트릴 공중합체의 극세 섬유제조 및 그 물성)

  • Lee, Shin-Hee
    • Fashion & Textile Research Journal
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    • v.14 no.3
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    • pp.472-477
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    • 2012
  • The conditions of wet spinning were considered in order to prepare the fine denier of acrylic fiber. Polyacrylonitrile copolymer was synthesized by the copolymerization of acrylonitrile (AN) and methyl acrylate (MA) initiated by an aqueous sulfite-chlorate redox system. Acrylic fiber was manufactured through wet-spinning in a dimethyl formamide (DMF) system. The conditions of wet-spinning were investigated by i-value, spinning speed, diameter of spinneret, draw ratio, water content of spinning dope and morphology of protofiber. The physical properties of fibers were investigated by Instron. In this experiment, the minimum i-value decreased with the decreasing spinneret diameter, an increased spinning speed, and an increased coagulation bath (CBC) concentration. The maximum draw ratio increased with an increased CBC. The optimum CBC and water content of the spinning dope were 60%-65% and 3.5%, respectively. The tenacity at the breaking point increased with a decreased fineness of fiber. The elongation at breaking point was almost the same value as a function of the fineness of fiber.

Effects of Forming Depth on the Deformation Behavior of Cup-like Tubes in Tube Spinning Process (튜브 스피닝 공정에서 성형깊이가 컵형 튜브의 변형거동에 미치는 영향)

  • Shin, Y.C.;Yoon, D.J.;Lim, S.J.;Choi, H.J.
    • Transactions of Materials Processing
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    • v.21 no.6
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    • pp.360-365
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    • 2012
  • The aim of this study was to investigate the effects of forming depth on the deformation behavior of cup-like tubes made of AISI1020 steel in tube spinning process. Spinning process was performed on cup-like tubes, which had an inner diameter of 34mm and thicknesses of 7, 8.5 or 11.5mm. The forming depths achieved were 3, 4, and 5.5mm. The complex deformation behaviors occurring during the tube spinning process was explained using the experimental results. Also analyzed were the causes of the material buildup and the bulge defect of inner surface, observed on cross section of tubes. The relationship between tube spinning conditions and the height of bulge defect was examined. The results indicate that bulge defect is increased with a decrease of the forming depth. Moreover, a critical forming depth exists for preventing the generation of the bulge defect in the tube spinning process. The present results will be useful for future decisions of forming depths for successful tube spinning of cup-like tubes.

Preparation and Physical Properties of Biodegradable High Performance PLA Fiber using Process Parameters (용융방사에 의한 생분해성 고강도 PLA 섬유 제조 공정 상 주요 공정 변수에 관한 연구)

  • Jeung, Woo Chang;Kim, Sam Soo;Lee, Sang Oh;Lee, Jaewoong
    • Textile Coloration and Finishing
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    • v.34 no.3
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    • pp.197-206
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    • 2022
  • The purpose of this study was to confirm the optimal spinning conditions for PLA (Polylactic acid) as a fiber forming polymer. According to the melt spinning test results of PLA, the optimal spinning temperature was 258℃. However, it needs to note that relatively high pack pressure was required for spinning at 258℃. At an elevated temperature, 262℃, mono filament was broken easily due to hydrolysis of PLA at a higher temperature. In case of fiber strength, it was confirmed that the draw ratios of 2.7 to 3.3 were optimal for maximum strength of melt spun PLA. Above the draw ratio, 3.3, the strength of the PLA fibers was lowered. It was presumed that cleavage of the PLA polymer chain over maximum elongation. The heat setting temperature of GR (Godet roller) showed that the maximum strength of the PLA fibers was revealed around 100℃. The degree of crystallinity and the strength of the PLA fibers were decreased above 100℃. The optimal take-up speed (Spinning speed) was around 4,000m/min. Thermal analysis of PLA showed 170℃ and 57℃ as Tm (melting temperature) and Tg (glass transition temperature), respectively.

Design of roller path for spinning of cylindrical cups of aluminum sheet metal (알루미늄 원통컵 스피닝 작업을 위한 롤러이송경로 설계)

  • Kim, Jong-Ho;Park, Gyu-Ho
    • Transactions of Materials Processing
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    • v.7 no.5
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    • pp.489-495
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    • 1998
  • Spinning is a chipless forming method for producing axially symmetric parts by using axial-radial motions of a spinning roller. This process has still some advantages in such a view point that a variety of complex shapes which can not be formed in a press can be easily spun at a low cost although it is one of the oldest forming methods for spinning mainly cookware parts for a long time. This study is to investigate the optimum roller path in order to obtain the maximum spinnability in producing cylindrical cups of Aluminum(A1050-H16) sheet metal. Working conditions applicable to any size of blank were predetermined through preliminary spinning tests. 9 types of roller path were proposed and experiments were carried out. The modified involute curve was shown to give the maximum drawing ration and more uniform quality of spun cups as compared with other results of this study. in addition thickness distribution and dimensional accuracy of spun cups were examined and discussed.

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The Change of Fraction of T.T.M. and Initial Modulus for PET Tire Cord Fibers with Various Spinning Speed (방사속도에 따른 타이어 코드용 PET섬유의 T.T.M. 분율과 초기탄성계수의 변화)

  • Cho, Hyun Hok;Lee, Kee Hwan;Park, Jong Bum;Kim, Sung Joong;Rhim, Moo San
    • Textile Coloration and Finishing
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    • v.6 no.4
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    • pp.34-39
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    • 1994
  • For the purpose of obtaining high modulus PET tire cord fiber by high spinning speed, the change of initial modulus and taut tie molecules (T.T.M) fraction with the PET tire cord fibers by different spinning speed is investigated. Initial modulus decreased with increasing spinning speed but increased above spinning speed of 1500m/min. Therefore, high modulus PET tire cord fiber may be obtained above spinning speed of 3500m/min. It was found that the initial modulus of fibers depends on fraction of T.T.M.

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Experimental Study on the Conventional Spinning of Cylindrical Steel Cups (원통형 컵에 대한 강판의 Conventional 스피닝의 실험 연구)

  • 이항수
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2003.05a
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    • pp.274-277
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    • 2003
  • The purpose of this study is preparing the database for conventional spinning of the steel sheets which are applied into the mechanical parts such as wheel disc and driving clutch drums. The experimental work for the conventional spinning of cylindrical typed shell has been carried out and the database for limiting spinning ratios, suing-back and thickness distributions has been obtained. The working conditions are categorized for the feeding velocity and dimension of rotating mandrel and forming roller. The results are useful to the product design of conical parts. And the present study can contribute to the improvement of industrial technology.

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Experimental Study on the Conventional Spinnability of Steel Sheets (강판재의 보통 스피닝에 대한 성형성 연구)

  • Lee H. S.
    • Transactions of Materials Processing
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    • v.14 no.9 s.81
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    • pp.764-771
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    • 2005
  • This study is related with the development of CNC spinning machine and the axisymmetric conventional spinning such as drum type and conical type steel shells. The CNC spinning machine is constructed with heavy duty frame and the hydraulic servo system is applied in order to give the exactness of motion control. The experiment has been carried out considering feeding velocity, mandrel shape, and the corner radius of mandrel and forming rollers. As a result of experiment, the limiting spinning ratio and thickness strain distribution are obtained and it can be seen that the spinnability is dominant to the feeding velocity and corner radius of forming roller. This research can contribute to the development of axisymmetric mechanical part which is applicable to automotive and aerospace industry.