Injection Molding Technology — Summer 2024

Define : (1) Injection Molding (2) Plasticizing capacity (3) Nozzle

Define : (1) L/Dratio (2) Compression ratio (3) Maximum Day-light (4) Helix angle

List advantages and disadvantages of Injection Molding.

List & Draw cycle of operation of Plunger type Injection Molding machine.

Calculate the Injection molding machine tonnage required for the following: Part dimension 60 x 30 x 30 cm. Material PP, Cavity Pressure for PP from graph: 756 bar, Gate: Direct Sprue.

List types of Nozzle. Explain any two with neat sketch.

Compare some characteristic of Hydraulic and Electrical drives for screw.

List types of Injection Molding Machine. Write specification of Injection Unit.

List Auxiliaries equipments used in Injection molding Plant. Draw and Explain about Cooling Tower.

Draw Screw for Injection Molding Machine. Label and Define various Screw terminologies.

Explain about Fluid heated Barrel of Injection Molding of Thermoset Machine.

Describe in brief about Injection Molds for Thermoset material.

Compare: Injection Molding of Thermoplastic with Injection Molding of Thermoset.

List advantages of screw plasticizing.

Explain Ring type non returned valve Screw tip in brief with neat sketch.

Define Clamping. List various type of Clamping used in Injection molding machine. Explain any one with neat sketch.

List and Explain Process variables for Injection Molding of Thermoset.

Explain in brief about Refrigerant used in the Chilling Plant.

In some Injection Molding Plants Chilling Plant used to chill the water and supply to the machines. Explain Principle and working of Chilling Plant with neat sketch.1

Find machine shot capacity of Injection molding having screw diameter 50 mm, Density of ABS/PC blend 1.15 g/cc, maximum refilling position 250 mm.

Explain significance of Thermocouple in Injection Molding Explain in brief about working of Thermocouple.

Explain reasons and remedies for the following faults of Injection Molding Process (1) Sink Mark (2) Weld Lines.

Explain in brief Start-up, running and shut-down process of Injection molding machine.

Explain about Metering Zone of screw in brief.

Compare: Screw Type Molding Machine with Plunger Type Molding Machine.