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PKSC 4300 Exam 2
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1. clarity, 4 reasons why we orient films:
crystallinity,
dimensional
stability/shrinka-
bility, gloss
2. orientation process of aligning polymer chains in a direction
3. random, natural cooling of polymer causes __________ polymer chain orientation, however
arranges stretching the film _____________ polymer chains.
4. strength, stiff- Stretching the film in one or two directions increases the _____________,
ness, stability ____________ and dimensional ______________ (helpful for printing)
5. monoaxial one direction orientation;
strength only matters in one direction;
6. monoaxial offers directional tear;
machine direction
7. biaxial two directions orientation;
8. biaxial offers strength, stiffness, and dimensional stability in two directions
9. biaxial most print films in laminations are biaxially oriented
10. tentering this method of orientation typically begins with a cast film
11. double bubble this method of orientation typically begins with a blown film
12. machine direc-
tion orienta-
tion (monoaxial
stretching)
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13. sequential biaxi-
al oriented ten-
tering machine
14. simultaneous bi-
axial oriented
tentering ma-
chine
15. double bubble bi-
axial orientation
16. Tubular Simulta- Which has better MD/CD balance? Flat Sequential or Tubular Simultaneous?
neous
17. Flat Sequential Which has better thickness uniformity: Flat Sequential or Tubular Simultaneous?
18. Flat Sequential Which has more film flatness: Flat Sequential or Tubular Simultaneous?
19. Tubular Simulta- Which has more randomization: Flat Sequential or Tubular Simultaneous?
neous
20. Tubular Simulta- Which has more bead and edge effects: Flat Sequential or Tubular Simultaneous?
neous
21. Flat Sequential Which has more dimensional stability: Flat Sequential or Tubular Simultaneous?
22. heat set shrink films do not have which step?
23. wettability &
treatment
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PKSC 4300 Exam 2
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24. wet successful adhesives (or any coatings) must be liquid and must ______ the
substrate. Then they must form a tough, flexible film.
25. wetting To understand adhesion, we need to understand surface _______________
26. tension To understand surface wetting, we need to understand surface _____________
27. entropy To understand surface tension, we need to understand ____________
28. entropy a tendency toward a lower energy state
29. lower polymer crystals have a __________ energy state than the same atoms arranged
in a non-crystalline manner
30. spherical droplet lowest energy form for a liquid
31. surface energy the extra energy that exists at the surface of a droplet of a liquid
32. droplet size method to measure a liquid's surface tension by looking at droplet size
method
33. DuNuoy Ten- method to measure a liquid's surface tension by measuring the force required to
siometer break the surface of a liquid
34. contact angle angle between the surface and a line drawn tangentially to the curvature of the
droplet
35. wets contact angle = 0 means the liquid ______ the substrate
36. contact angle, liq-
uid, film
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PKSC 4300 Exam 2 Practice
Questions and Answers
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PKSC 4300 Exam 2
Study online at https://quizlet.com/_7z28lp
1. clarity, 4 reasons why we orient films:
crystallinity,
dimensional
stability/shrinka-
bility, gloss
2. orientation process of aligning polymer chains in a direction
3. random, natural cooling of polymer causes __________ polymer chain orientation, however
arranges stretching the film _____________ polymer chains.
4. strength, stiff- Stretching the film in one or two directions increases the _____________,
ness, stability ____________ and dimensional ______________ (helpful for printing)
5. monoaxial one direction orientation;
strength only matters in one direction;
6. monoaxial offers directional tear;
machine direction
7. biaxial two directions orientation;
8. biaxial offers strength, stiffness, and dimensional stability in two directions
9. biaxial most print films in laminations are biaxially oriented
10. tentering this method of orientation typically begins with a cast film
11. double bubble this method of orientation typically begins with a blown film
12. machine direc-
tion orienta-
tion (monoaxial
stretching)
https://www.stuvia.com/user/edupac https://www.stuvia.com/user/edupac PKSC 4300 Exam 2 Practice Questions and Answers
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PKSC 4300 Exam 2
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13. sequential biaxi-
al oriented ten-
tering machine
14. simultaneous bi-
axial oriented
tentering ma-
chine
15. double bubble bi-
axial orientation
16. Tubular Simulta- Which has better MD/CD balance? Flat Sequential or Tubular Simultaneous?
neous
17. Flat Sequential Which has better thickness uniformity: Flat Sequential or Tubular Simultaneous?
18. Flat Sequential Which has more film flatness: Flat Sequential or Tubular Simultaneous?
19. Tubular Simulta- Which has more randomization: Flat Sequential or Tubular Simultaneous?
neous
20. Tubular Simulta- Which has more bead and edge effects: Flat Sequential or Tubular Simultaneous?
neous
21. Flat Sequential Which has more dimensional stability: Flat Sequential or Tubular Simultaneous?
22. heat set shrink films do not have which step?
23. wettability &
treatment
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PKSC 4300 Exam 2
Study online at https://quizlet.com/_7z28lp
24. wet successful adhesives (or any coatings) must be liquid and must ______ the
substrate. Then they must form a tough, flexible film.
25. wetting To understand adhesion, we need to understand surface _______________
26. tension To understand surface wetting, we need to understand surface _____________
27. entropy To understand surface tension, we need to understand ____________
28. entropy a tendency toward a lower energy state
29. lower polymer crystals have a __________ energy state than the same atoms arranged
in a non-crystalline manner
30. spherical droplet lowest energy form for a liquid
31. surface energy the extra energy that exists at the surface of a droplet of a liquid
32. droplet size method to measure a liquid's surface tension by looking at droplet size
method
33. DuNuoy Ten- method to measure a liquid's surface tension by measuring the force required to
siometer break the surface of a liquid
34. contact angle angle between the surface and a line drawn tangentially to the curvature of the
droplet
35. wets contact angle = 0 means the liquid ______ the substrate
36. contact angle, liq-
uid, film
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