Wet Spinning

1. Introduction
2. Principle of Wet Spinning

The wet spinning process is used for polymers that need to be dissolved in a solvent to be spun.The spinneret is submerged in a chemical bath that causes the fiber to precipitate, and then solidify, as it emerges i.e. It is used when the solvent can’t be evaporated and must be removed by chemical means.In wet spinning, the polymer is dissolved in a solvent at a target concentration to make a polymer solution with the desired viscosity. This polymer solution is then extruded under heat (if needed) and pressured into a liquid coagulation bath. Then fibers are combined as yarn and the yarn is drawn, with very good controls, to orient the molecules in the fibers so that it becomes stronger. 

Examples: Viscous, Acylic, Rayon, Aramide, Modacrylic and spandex fibres are produced by wet spinning.

3. Process of Wet Spinning
  • In the melt spinning process, fibers are formed via melts, which are forced through nozzles at high pressure and then solidified by cooling.
  • In the dry spinning process, polymer solutions are used, which are also spun through nozzles. In this case, the fiber formation occurs by evaporation of the solvent from the spun solution.
  • In the wet spinning process, polymer solutions are also used, but fiber forms by precipitation of the polymer in a liquid precipitation bath.
Wet Spinning

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