Semi-melt spinning

Gel spinning, also known as semi-melt spinning, is a method that prepares high-strength and high-elastic module fibre in the gel state. After the extrusion of the polymer solution or plasticised gel from the spinnerets, it is cooled in solvent or water before being stretched into gel fibre by ultra-high... 

Hollow membrane fibers are required for many medical application, e.g. for disposable dialysis. Such fibers are made by usmg an appropriate fiber spinning technique with a special inlet in the center of the spinneret through which the fiber core forming medium (liquid or gas) is injected. The membrane material may be made by melt-spinning, chemical activated spinning or phase separation. The thin wall (15-500 xm thickness) acts as a semi-permeable membrane. Commonly, such fibers are made of cellulose-based membrane materials such as cellulose nitrate, or polyacrylonitrile, polymethylmethacrylate, polyamide and polypropylene (van Stone, 1985). 

Nanocomposite fibers have been produced by compounding a semi-aromatic poly(m-xylene adipamide) with an organophilic montmorillonite [61]. Partially oriented fibers of the nanocomposite were obtained by melt spinning on a mulfifilament fiber extrusion system. The effect of the drawing velocity on... 

Methods of Achieving Orientation. The most common ways of achieving orientation Tn semi crystal 1ine polymers are spinning from a gel, melt or solution, stretching in the solid state, or solid state extrusion. Biaxial orientation is found in blown films or in films prepared by passing a melt over a conical die. 

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