Structure development in synthetic fiber production

Kikutani, Takeshi

doi:10.1533/9781845696504.2.157

Cited by 14 publications

(10 citation statements)

References 40 publications

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“…High take-up speeds result in high strain rates in the spin-line, giving rise to increased molecular orientation and strain-induced crystallization, and thus to reduced drawability of the as-spun filament [ 164 ]. In other words, improvements in tensile strength level off when the highest achievable orientation is reached.…”

Section: Physics Of Melt-spinningmentioning

confidence: 99%

“…Tensile properties of melt-spun fibers, in general, depend on molecular weight, molecular structure and orientation, glass transition temperature, and degree of crystallinity of the fiber [ 164 ]. Tensile properties of the most common melt-spun fibers, based on the linear flexible-chain polymers HDPE, PP, PET, PA 6 and PA 6.6, are in the range of 0.3–1.2 GPa tensile strength, 0.5–15 GPa Young’s modulus and 8–50% strain at break [ 166 , 167 ].…”

Section: Physics Of Melt-spinningmentioning

confidence: 99%

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Melt-Spun Fibers for Textile Applications

et al. 2020

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Textiles have a very long history, but they are far from becoming outdated. They gain new importance in technical applications, and man-made fibers are at the center of this ongoing innovation. The development of high-tech textiles relies on enhancements of fiber raw materials and processing techniques. Today, melt spinning of polymers is the most commonly used method for manufacturing commercial fibers, due to the simplicity of the production line, high spinning velocities, low production cost and environmental friendliness. Topics covered in this review are established and novel polymers, additives and processes used in melt spinning. In addition, fundamental questions regarding fiber morphologies, structure-property relationships, as well as flow and draw instabilities are addressed. Multicomponent melt-spinning, where several functionalities can be combined in one fiber, is also discussed. Finally, textile applications and melt-spun fiber specialties are presented, which emphasize how ongoing research efforts keep the high value of fibers and textiles alive.

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Section: Physics Of Melt-spinningmentioning

confidence: 99%

Section: Physics Of Melt-spinningmentioning

confidence: 99%

Melt-Spun Fibers for Textile Applications

et al. 2020

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“…But other changes exert only moderate influence in determining the freeze-line location [21]. Since the as-spun fiber quality is uniquely determined by its birefringence, which in turn is directly related to stress at the freeze-line, so the degree of sensitivity of the as-spun fiber properties changes in these process variables are the same as that of stress at the freeze-line [9,17,20].…”

Section: Sensitivity Analysismentioning

confidence: 99%

“…The intermediate take-up speeds in a melt-spun PET fibers show amorphous at a slow crystallization behavior of PET, and the birefringence depends on the (experimentally measured) spinline stress. To show the relationship between as-spun fiber birefringence and the calculated stress at the freeze line, the stress at freeze line is taken to be the spinline stress at which the velocity is 95% of the take-up velocity [14,17]. It is observed that a linear variation is obtained with stress optical coefficient approximately about 6 Â 10 À9 to 9 Â 10 À9 Pa À1 , which is then compared with the values obtained by different experiments [14].…”

mentioning

confidence: 99%

Chapter Review on Computer Simulation of Melt Spinning: A System of Systems Perspective

Limeneh¹,

Yilma²

2021

Systems-of-Systems Perspectives and Applications - Design, Modeling, Simulation and Analysis (MS&A), Gaming and Decision Su

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This chapter discusses an approach for process simulation in the design of melt spinning process for finding optimal design parameters concerning spinneret, quench air unit and other technical parameters for maximum throughput and quality. The property of as-spun fiber is a function of structural parameters at a given condition and orientation of the structural parameter and it is highly governed by stress level at freeze line. Thus, to define structural property and associated relationship, it requires to identify the process to control the variables (or factors) that affect the structural parameter as well as final fiber property. In addition, this chapter also provides a System-of-Systems (SOS) perspective on melt spinning process and its computer modeling along with mathematical equations for estimating spinline stress with a change in process variables. The spinline stress will be used as an input for a computer simulation to have process optimization by changing the necessary variables until it optimized.

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“…It also should be noted that crystallization behavior can be accelerated through the development of molecular orientation, while the state of molecular orientation can be affected through the spontaneous structure formation caused by the crystallization [1]. Although there have been various publications on the uniaxial and biaxial stretching behavior of PET films [2][3][4][5][6][7][8][9][10][11][12], research on in situ measurement of stretching behavior and three-dimensional analyses of orientation development is limited [13,14].…”

Section: Introductionmentioning

confidence: 99%