PKSC 4300: wettability and treatment (22-49), orientation (optional), and ca and blown film (optional) QUESTIONS AND CORRECT DETAILED ANSWERS WITH COMPLETE SOLUTIONS | GRADED A+

PKSC 4300: wettability and treatment (22-49), orientation
(optional), and ca and blown film (optional)


1. Orientation of film:


2. 4 reasons why we orient films:: clarity, crystallinity, dimensional stability/shrinkability, gloss


3. define orientation: process of aligning polymer chains in a direction



4. natural cooling of polymer causes polymer chain orientation, how-


ever stretching the film polymer chains.: random, arranges


5. strength, stiffness, stability


Stretching the film in one or two directions increases the ,


and dimensional (helpful for printing): strength, stiffness,


stability

6. monoaxial: - one direction orientation that offers linear directional tear


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, - when strength only matters in one direction
- machine direction

7. biaxial: - two directions oriented


- offers strength, stiffness, and dimensional stability in two directions
- most print films in laminations are

8. tentering: this method of orientation typically begins with a cast film


9. double bubble: this method of orientation typically begins with a blown film


10. machine direction orientation (monoaxial stretching):



11. sequential biaxial oriented tentering machine:


12. simultaneous biaxial oriented tentering machine:


13. double bubble biaxial orientation:




14. Which has better MD/CD balance? Flat Sequential or Tubular Simultaneous?-


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