Injection Mould
What is the purpose of the ejector system?
  • To remove the solidified part from the mould
  • To heat the plastic
  • To cool the mould
Explanation: The ejector system pushes the solidified plastic part out of the mould once it has cooled and taken the desired shape.
What material is used to make moulds in injection moulding?
  • Plastic
  • Steel or Aluminum
  • Rubber
  • Glass
Explanation: Moulds in injection moulding are typically made from steel or aluminum due to their durability, precision, and ability to withstand high pressure and temperature.
What determines the cooling time of a plastic part?
  • Type of plastic used
  • Temperature of the injection unit
  • Speed of the screw rotation
  • Colour of the plastic
Explanation: The cooling time depends on factors like the type of plastic, thickness of the part, mould temperature, and cooling system efficiency.
Which of the following is an advantage of injection moulding?
  • High production speed
  • High material waste
  • Poor surface finish
  • Limited design possibilities
Explanation: Injection moulding allows for high production speed, making it an efficient process for mass-producing plastic parts with minimal waste, excellent surface finish, and complex designs.
What are the main types of injection moulding machines?
  • Hydraulic, Electric, Hybrid
  • Automatic, Manual, Semi-Automatic
  • Small, Medium, Large
  • Horizontal, Vertical, Diagonal
Explanation: Injection moulding machines are classified into hydraulic, electric, and hybrid types based on their power source and control system.
Which injection moulding machine is the most energy-efficient?
  • Hydraulic
  • Pneumatic
  • Electric
  • Manual
Explanation: Electric injection moulding machines are the most energy-efficient because they use servo motors instead of hydraulic pumps, reducing power consumption and improving precision.
What is the main advantage of hydraulic injection moulding machines?
  • Faster operation
  • Lower power consumption
    • Explanation: Hydraulic injection moulding machines provide a high clamping force, making them ideal for large and complex moulds. They are also more cost-effective for heavy-duty applications compared to electric machines.