Describe about melt spinning with sketch to produce polymeric fiber .

Melt Spinning :-

The process of spinning by which fiber or filament is produced from melted polymer chips by extruding through a spinneret  is called met spinning.

Process of Melt Spinning :

1. The fiber forming polymer chips fed into a hopper.

2. The polymer chips are electrically heated over melting point and melt in a heating grid. This converts the solid polymer into a viscous liquid .During heating process a cross linking or thermal degradation of polymer may occur leading to formation of lump

3. These   lumps can be easily removed from hot molten polymer by using a filter pack.

4. The hot molten polymer should be protected from the surrounding oxygen to avoid oxidative degradation . this is effected mostly by creating an inert environment around the molten polymer with nitrogen carbon dioxide or steam.

5. The molten polymer then enters a constant rate pump which in turn , pump the polymer melt through the spinneret from where a continuous and very fine filament emerges .

6. The polymer melt is thus forced through the fine holes of the spinneret from where a continuous and very fine filament emerges.

7. The filament emerging from the spinneret solidifies as it comes in contact with cold air.

8 .The cooling and solidifies process may be enhanced by a cold air blast .

9. Then solid filament emerging from the spinneret are subsequently wound on spindles