Plastic Product and mould Design Question Bank

                CENTRAL INSTITUTE OF PLASTICS ENGINEERING & TECHNOLOGY

                                                Question Bank

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COURSE : DPT

SEMESTER : IV

SUBJECT : Plastic Product and mould Design

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1. Explain injection molding process and process parameters in detail

2. What are the effects of parting line on core and cavity?

3. Explain sub-marine gating system with neat sketch

4. Differentiate 2-plate vs. 3-plate mold?

5. Explain shot capacity and plasticizing capacity

6. Explain Runner and Gate balancing system with neat sketch

7. What is a. daylight b. injection pressure c. clamping pressure

8. What are the various types of defects and their remedies in injection molding?

9. What are gussets discuss in detail.

10. Write a short note on molded holes

11. Write a short note on mould alignment

12. What is shrinkage? Explain how the shrinkage value is calculated?

13. Write a short note on taper.

14. Write a short note on Ribs & Bosses

15. Write a short note on split molds.

16. Write a short note on Undercuts and its types with appropriate sketches

17. Write a short note on metal inserts used in injection molding

18. Differentiate between integer and insert type of molding

19. Write a short note on sprue bush and its types. What are the materials used for construction

of the same.

20. Explain a. sprue puller Pin b. push back pin c. ejector grid and its elements

21. What are the important points to be considered while deciding the size of Runner?

22. What is Gate? Why the cross sectional area of Gate is so Important?

23. Write a short note on Tab Gate with neat sketch.

24. What is valve ejection system? Why it is necessary?

25. Explain stripper plate ejection system with neat sketch.

26. What are the advantages of injection molding compared to other plastic manufacturing

process?

27. What are the types of gates used in injection molds?

28. What is clamping force in injection molding and how it is calculated? What are its units and

applications?

29. What are the parts of conventional injection mold and what are the materials used for

construction of the same?

30. What is extrusion? Explain the typical classification of extruded products.

31. What is thermoforming process? What are the applications of the process? What are materials

best suitable for thermoforming process?

32. Explain breaker plate and its function in extrusion with neat sketch.

33. Explain Melt fracture in extrusion with appropriate sketch? What are its causes and remedies?

34. What is extrusion? Explain the typical classification of extruded products

35. Explain what is drag flow in extrusion process?

36. What are the functions of the screen pack and breaker plate at the die end of the extruder

barrel?

37. What are the various forms of extruded shapes and corresponding dies?

38. What is rotational molding of plastics?

39. What are the parts of an extruder? Explain compression ratio and L/D ratio.

40. What are the factors influencing extruder output?

41. What is loading chamber? How loading chamber depth is calculated?

42. Explain how to determine the clamping force and No. of Impressions in compression

molding? Mention its units.

43. Compare Transfer Molding Vs Injection molding

44. What are the advantages & Disadvantages of compression Molding

45. Write a short note on modified trapezoidal type of runner with neat sketch.

46. Explain how the cooling of integer type core plate can be achieved?

47. Write a short note on 3D printing.

48. Compare compression molding vs. injection molding

49. Explain compression molding cycle with neat sketch

50. Explain transfer molding cycle with neat sketch

51. What is Rapid prototyping? What is its importance in modern world