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By Toshi Takajima

Probably the most fascinating advancements of the previous couple of many years within the box of fiber construction were the results of extensive examine in jap and examine institutes. This publication used to be initially released in jap via the Society of Fiber technology and expertise, Japan, on the way to current a radical clinical and technological assessment of advances in fiber creation, and is now released in English. as well as offering an in depth assessment of modern breakthroughs in fiber spinning know-how, this well known booklet illustrates how R&D will pay

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Extra info for Advanced Fiber Spinning Technology

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Blouses. Characteristics: Dry spun-silk hand, soft drape. 35 Appendix 247 Main technology: Bicomponent fiber of nylon and EVAL. Sheath-core. Examples of final products: Sports wear. Coats. Characteristics: Peach-like type with high shrinkage. 35 248 Advanced fiber spinning technology FSY (Unitika) Main technology: Bicomponent fiber consisting of two polyesters with different alkali-solubility. Separation by alkali-treatment. Examples of final products: Ladies' coats. Wiping cloths. 1 dtex with wedge-shaped crosssection.

Such a banded texture was also observed in longitudinal thin section36,37 and in the fibrillar fragments 38 of PPTA. 10(a) reveals that there exist microfibrils running through these bands along the direction of the fiber axis. The banded structure is produced by periodical bending of polymer chains. 10(b) is the dark-field image of the same portion of the specimen that was used for Fig. 10(a), taken using the 110 and 200 reflections on the equator. The bright spots in Fig. 10(b), namely the crystallites oriented to give 110 or 200 reflections, are distributed seemingly in a random fashion.

Then the importance of gelation in the process of solution spinning and of phase separation will be mentioned. Finally, examples of mathematical simulation of high speed melt spinning will be demonstrated. Fundamentals of spinning 3 .... 1 '~ ... 2 Technological analysis of spinning For the technological analysis of spinning, three fundamental equations are derived from the conversion of energy, the conversion of momentum and the conversion of matter, respectively. 2] ox oy OZ where t is the time, (x,y,z) the spatial co-ordinates, V(Vx, Vy , Vz) the velocity of polymer, and i, j and k are the unit vectors in the x, y, and z directions, respectively.

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