By Toshi Takajima
Probably the most attention-grabbing advancements of the previous few many years within the box of fiber construction were the results of in depth learn in jap and examine institutes. This booklet was once initially released in jap by way of the Society of Fiber technological know-how and expertise, Japan, on the way to current a radical clinical and technological assessment of advances in fiber construction, and is now released in English. as well as supplying an intensive evaluate of contemporary breakthroughs in fiber spinning expertise, this well known publication illustrates how R&D will pay
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Extra info for Advanced Fiber Spinning Technology
5 A spinning speed of 7000 m/min or more lowers the quality of spun filaments. 2. First of all, the necking phenomenon will be discussed. 11 shows the change of diameter of the PET filament due to spinning speed in melt spinning experiments by Shirnizu. 4o In these experiments, it was confirmed that the necking point moves up and down within certain limits, and that crystallization hardly occurs at all before necking, but increases very suddenly at the onset of necking. The real cause of this necking phenomenon is not yet known.
5 Apparatus for oriented crystallization of polyethylene from solution. 3 Gelation and phase separation Recently, theoretical and experimental studies on gelation and phase separation of polymer systems have flourished. ,32 the solgel transition curve intersects the SD (spinodal decomposition) curve as shown in Fig. 6, and the phase diagram is partitioned into four areas: Area corresponding to a homogeneous sol state. (ii) Area in which liquid-liquid separation takes place due to SD but gelation does not occur.
In order to understand the spinning process, it is indispensable for us to know how structure will be formed during the process as well as to carry out the detailed technological analysis of the process. In the following part of this chapter, the fundamental equations describing the melt spinning process accompanied by crystallization will be developed. After this the oriented crystallization, which is closely related to the structure formation during the spinning process, will be discussed and the differences between oriented and unoriented crystallization will be highlighted.