Spinneret stationary

Coating can be done before product preparation and pattern making when the reinforcement is available in roll or in tow formats. In this case the reinforcement material is rewound between two rollers and electrospinning takes place in between by using stationary spinneret electrode(s). Therefore, there is some technological flexibUity the production of nanofibrous interlayers can be accomplished by both the fiber manufacturer and the composite product manufacturer. 

Collectors with dUferent shapes and types (Fig. 2) are considered to be the receivers of electrospun nanofibers after being ejected out of the spinneret. The orientation of the electrospun nanofibers can be controlled via using specific collectors with certain shape and type. The three main types of collectors are the stationary (plate), cylinder, and the disc (Murugan and Ramakrishna 2006 Theron et al. 2001). 

Finally, the relative importance of the various forces in Eq.9. 58 is shown in Figure 9.7 (from Ziabicki and Kawai, 1985) as a function of the take-up speed. The melt-spun polymer is a polyester, the spinneret radius is 125 [xm, the filament radius at take-up is 9.25 fim, the viscosity is 300 Pa s, the cooling air is stationary, and the mass flow rate is proportional to the spinning speed. It is clear fi-om this figure that for low take-up speeds the rheological and... 

Wu et al. [93] employed a stationary cylinder spinneret that improved the mass production of nanofibres by 260 times with respect to conventional electrospinning system. Later, fibre uniformity was improved using a strip-distributed solution delivery method. This type of electrospinning is named tipless electrospinning [94]. Figure 4.8 demonstrates different stationary spinnerets. 

Fig. 4.8 Schematic diagram of different stationary needleless spinnerets (electrospinning direction along the red arrow). Reproduced from Ref. [87]...

---