a) Tenter frame and bubble frame
b) Tenter frame and Double bubble
c) Tenter bubble and Double bubble
d) Tenter bubble and Double Frame
Answer: b
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.
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