By Toshi Takajima
One of the most attention-grabbing advancements of the previous few many years within the box of fiber creation were the results of extensive research in eastern and examine institutes. This ebook used to be initially released in jap via the Society of Fiber technological know-how and know-how, Japan, for you to current an intensive medical and technological assessment of advances in fiber creation, and is now released in English. as well as offering an intensive assessment of modern breakthroughs in fiber spinning know-how, this well known booklet illustrates how R&D pays
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Additional info for Advanced Fiber Spinning Technology
1) introduced the fibrous precipitates grown from a solution of high density polyethylene, the so-called shish-kebab structure. It should be noted that the formation process of this structure was not a matter of common knowledge until comparatively recently. Here, the studies by McHugh et al. 30 ,31 on the formation process will be introduced. Olwt% xylene solution of ultra-high molecular weight polyethylene (Mw = 3 x 106) was flowed through a funnel-shaped pipe as illustrated in Fig. 5. A polarized light microscope was used to observe the formation process of the fibril at the tip of the seed crystal which was suspended in the pipe.
And the other face, the fibrillar structure, having a great number of tiecrystallites, is enhanced. Accordingly, the films/fibers have excellent physical properties such as high modulus and high strength. 35 parallel to each other, with all chains being oriented uniaxially owing to elongational flow working on the domains. As an example of fibers made in such a way, poly(p-phenylene terephthalamide) is discussed below. 1 Poly(p-phenylene terephthalamide) (PPTA) A Kevlar fiber was annealed at 400°C under the condition of constant length, and then fibrillar fragments were obtained by tearing them off from the fiber.
In the theory of Kase and Matsuo, mean values of temperature and of stress over the whole area of a transverse section of the filament were used. In the process of high speed spinning, however, the variables such as temperature, stress, orientation and crystallinity must be expressed as functions of the radial distance from the central axis of the filament as well as the distance from the spinneret. For example, consideration of the radial distribution of these variables is inevitable in discussing inhomogenous structures such as skin-core structure.
Advanced Fiber Spinning Technology by Toshi Takajima