Question

__________ is the process which reduces the residual strain after the extrusion process.

(a) Lacquering

(b) Canning

(c) Electroplating

(d) Annealing

I had been asked this question by my college director while I was bunking the class.

This intriguing question originated from Orientation of Thermoplastic Films in chapter Thermoplastic Polymers Properties & Processing of Food Packaging Technology

Answer 1

Right choice is (d) Annealing

The explanation: Annealing is the process which reduces the residual strain after the extrusion process. Films can be annealed by the application of heat to partially relax the forces while maintaining the film in a highly stretched condition. It is then cooled to room temperature and the restraint on the film released.