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Pksc 4300: Orientation Exam Questions And Correct Detailed Answers With Complete Solutions | Graded A+

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PKSC 4300: Orientation exam

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PKSC 4300: Orientation exam


1. Why are films oriented?: To change the properties of plastic materials


- more clear
- make it more dimensionally stable (above T_c)

2. What is orientation?: the process of aligning polymer chains in a direction by stretching the film when


above the glass transition temperature

- can be oriented monoaxially or biaxially

3. Why is a film oriented monoaxially?: when only strength in one direction matters


- offers directional tear

4. Why is a film oriented biaxially?: when strength and stiffness in two direction matters


5. What are the methods of orienting film?: - sequential set of rolls; each moving faster than the


last - MDO
- tentering frame - MDO and CDO
- double bubble - BO
- tripple bubble - BO and heat set



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