Anna University B.Tech Polymer Science And Rubber Technology Question Paper
B.E./B.Tech. DEGREE EXAMINATION,APRIL/MAY 2010
FIFTH SEMESTER Polymer Technology
PM501 – PROCESSING TECHNOLOGY - I
Time: 3 Hours Max. Marks: 100
Answer all the Questions
Part A (10 x 2 = 20 marks)
1. Write the various processing techniques used in Plastic Industry.
2. What are the limitations of raw polymers?
3. Name three compounding machinery.
4. Define injection Molding.
5. Define the terms i) Injection Pressure ii) Clamp force
6. What is plasticating rate.
7. What is the significance of L/D ratio.
8. Differentiate injection and extrusion blow molding process.
9. Define the term Pinch-off.
10. Write the various thermoforming machineries.
Part B (16 x 5 = 80 marks)
(Question No.11 is Compulsory)
11.i) Discuss the process of injection molding in detail.
ii) How injection molding of thermoplastic differ from that of thermoset.
12.a)i) Discuss the method of incorporation of various additives to polymers.
ii) Discuss the mechanism of functioning of various additives in plastics.
OR
12.b) Explain the types of compounding machineries.
13.a)i) What is screw plastication?
ii) Mention the types of Injection Moulds.
iii) Explain the function of screw in molding of plastics.
OR
13.b) Discuss in detail the clamping unit of injection molding machines.
14.a) Discuss the various process parameters during blow moulding.
OR
14.b) Explain
i) injection blow moulding process
ii) stretch blow moulding process
15.a) What is thermoforming? Write the various techniques in thermoforming.
OR
15.b) Write short notes on following:
i) Trimming
ii) Shrinkage
iii) Hot Strength
iv) Heat balance
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