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Title: Injection Moulding Objectives The following questions will be answered once this experiment has been carried out: * To work out on the Practical Determination of Injection Stroke and Shot Size * To work out on the Practical Determination of Hold-on Time * How do effect Hold-on Pressure on the process? * What is the effect of Injection Speed on process? * To examine the influence of processing variables on molecular orientation in polystyrene (PS). Results and Discussion (A) Injection Phase: Practical Determination of Injection Stroke and Shot Size Inj.Screw Stroke (mm) Injection Speed Weight (g) 20 3.4 9.97 30 3.43 15.7 40 3.58 21.55 50 3.81 27.26 60 3.9 33.04 70 4.17 38.84 80 4.3 44.47 82 4.43 45.35 85 4.42 46.56 Table (A) (B) Packing Hold-on Phase: Practical Determination of Hold-on Time Pressure (bar) Hold-on Time (s) Comp. Weight (gm) 10 0 45.81 2 46.12 4 46.17 6 46.24 8 46.23 Table (B) Fig 1: Shows effect of hold-on time on moulded component (C) Effect of Process Variables: Hold-on Pressure (where hold-on time is const.) Hold-on Pressure (bar) Temp. (ºC) Comp. Weight (gm) 10 21 39.91 30 24 40.1 60 28.4 41.56 Table (C) (D) Effect of Process Variables: Injection Speed (where time and pressure are const.) Injection Speed Temp. (ºC) Comp. Weight (gm) 90 29 39.89 60 30 39.8 30 32 39.79 Table (D) Analysis of Injection Moulded PS (A) Physical Analysis Physical Dimension Sample A Sample...

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