In wet spinning, a suitable solvent is used to prepare the fiber-forming solution and another coagulant is used in the coagulating bath. The solution is extruded through a spinneret and in contact with coagulant cellulose is regenerated. Here a Working Flow Chart of Wet Spinning Process.
Working Flow Chart of Wet Spinning Process
At first solid polymer and the suitable solvent is dissolved in a solution vessel.
The solution is then heated in the heat exchanger.
The solution is passed/extruded to spinneret which immersed in a coagulation bath/spin bath by pump.
The polymer is chemically regenerated and it is converted into the filament of solid form.
The filament is converged and wound on the bobbin.
The wended filament is then drawn and finally, it is washed & dried and is also wound on a suitable package.
This is the oldest, most complex, and also the most expensive method of man-made yarn manufacture. This type of spinning is applied to polymers that do not melt and dissolve only in non-volatile or thermal unstable solvents.
Wet Spinning process:
- In wet spinning, a non-volatile solvent is used to convert the raw material into a solution.
- The solvent is extruded through the spinneret either by simply washing it out or by a chemical reaction between the polymer solution and a reagent in the spinning bath.
- After extrusion, the solvent is removed in a liquid coagulation medium.
- Finally, the filament yarn either is immediately wound onto bobbins or is further treated for certain desired characteristics or end-use.
Example: Wet spinning is used in the production of aramid, Lyocell, PVC, Vinyon – PVA,, viscose rayon, spandex, acrylic, modacrylic fibers, and so on.
Advantages: Large tows can be handled
Disadvantages: Slow (70-150 yds /min), Washing to remove impurities, Solvent, and chemical recovery
Author of this Article: Muhammad Ibrahim Khalilullah Department of Textile Engineering Daffodil International University Email: [email protected]