Controlling fibre alignment and web morphologies

8 Collectors used for regulating the fibre collection process (a) rotating roller (b) vibrating plate (c) sharp edged rotating disc (d) frame (e) fork (f) point collector (g) drum. 

Based on the above concept, a silicon wafer, containing four couples of inter-paralleled Au stripes, has been used as the collector. The selective connection of one electrode couple to the ground electrode each time in 

Yarns are continuous fibre bundles with the fibres partially oriented. The preparation of yarn has been based on either an in situ or a postspinning twisting process. The preparation of a continuous nanofibre yam consists of a special deposition system which collect the fibres continuously and twists in sequence so as to form a continuous yarn. A metal cylinder (Ko et al., 2003) and a funnel-like collector (Kim et al., 2003) have been employed for this purpose, and when the nanofibres are electrospun to the inner side of the collector, they are drawn mechanically, or with the aid of vacuum, into a continuous thread, and twisted by rotating the collector or by using an additional twisting system, to form a continuous yam (Fig. 5.9). 

Although a random deposition of electrospun fibres gives a nonwoven fibre sttucture, the web morphology varies depending on the polymer properties and the operating conditions. Usually, the nanofibres are accumulated by a simple physical interaction and the fibres do not bond with each other. However, when the electrospinning distance is very short, the solvent has insufficient 

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