Question

Which of the following methods are used for orientation of plastic films?

(a) Tenter frame and bubble frame

(b) Tenter frame and Double bubble

(c) Tenter bubble and Double bubble

(d) Tenter bubble and Double Frame

I have been asked this question in a national level competition.

My question is based upon Orientation of Thermoplastic Films in portion Thermoplastic Polymers Properties & Processing of Food Packaging Technology

Answer 1

The correct choice is (b) Tenter frame and Double bubble

Easy explanation: Tenter frame and Double bubble are the two methods are used for orientation of plastic films. It generally includes heating of the film and stretching it in uniaxial or biaxial direction on a tenter or double frame. The orientation decides the use of the film.