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Melt spinning of polymers involves the forcing of polymer melt through spinnerettes (fine holes) into an atmosphere kept at a temperature lower than the melting point of the polymer, which causes the fine diameter polymer melt to harden into filaments. Melt spinning is not used in case of the __________ fibres.
The extrusion ratio for hot extrusion is much more than the extrusion ratio for cold extrusion.
If the effective flow stress for extrusion is 100 MPa and the extrusion ratio is 4, then find the ideal extrusion pressure for the process?
The pressure required to maintain flow during indirect extrusion
P. decreases with decreasing rate of the billet
Q. Increases with increasing extrusion ratio
R. is independent of the length of the billet
S. is independent of the extrusion ratio
In the manufacture of viscose rayon, the raw material used industrially is
Viscose rayon is
Viscose rayon is chemically
A polymeric substance used to make parachute is: (A) Rayon (B) Viscose (C) Cotton (D) Terylene
Viscose rayon
What is the main raw material of Viscose rayon?