Polymer Technology
7.5 ECTS
Ladok code: 42RP07The exam is given to: ExamCode:
Date of Re-exam: 2018-03-16
Time: 09:00-13:00
Means of assistance:
Total amount of point on exam:: 50p Requirements for grading:
ECTS: E: 26-30 p, D: 31-35 p, C: 36-40 p, B: 41-45 p, A: 46-50 p.
Additional information:
Next exam date:
The results are for the most part posted within three weeks after the exam, otherwise it’s the following date: Important! Do not forget to write the ExamCode on each paper you hand in.
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1
Question#1
a) What is the function of impact modifier in plastic products? How it works? (3)
b) Under what conditions a plasticizer works as a hardener? (2)
c) How the bleeding in plastic products can be minimized? (2)
d) What are the master batches? Why sometime they are necessary to produce before processing plastic products? (3)
Question#2
a) Explain different feeding options in extrusion process? How feeding will effect on final dimensions of the product? (4)
b) What are hot and cold runner systems? Write their advantages and disadvantages. (2) c) What is Warping and Jetting problems in injection molding process? (2)
d) Draw schematic diagram of melt spinning process showing MDR and SSDR. (2)
Question#3
a)
Following terminologies are used in blown film process, Blown up ratio, frost line and blown film width. Define all of them. (3)b)
Write the name of different thermoforming processes. What is the major difference? (2)c)
What will be the effect of following on melt spun fibers: (3)a. Molecular weight of polymer b. Solid state draw ratio
c. Melt flow index
d)
What are critical parameters in calendaring process? (2)Question#4
a)
How the plastic and textile industry can be made more sustainable? (3)b)
What critical challenges are involved in recycling of plastic composite materials? (3)c)
How thermoset materials are recycled chemically? (2)2
Question#5
a) What is the difference between bulk molding and sheet molding compounds? (2)
b) Write the important steps involved in vacuum transfer molding process? (3)
c) How the amount of resin can be controlled in filament winding process? (3)
d) What are the prepregs? What are the advantages when we use prepregs for
