Which process moves the solidified plastic along a conveyor belt after extrusion?

• A. Vacuum Forming
• B. Blow Moulding
• C. Injection Moulding
• D. Extrusion Moulding

Answer: (D)

Extrusion creates a continuous plastic profile by forcing material through a die. As the extruded strand or section comes out, it is still warm and begins to solidify, so it is pulled along by rollers onto a conveyor to cool further and be cut to length as needed. This setup—a continuous product moving away from the die on a belt or haul-off system—is characteristic of extrusion processes, which is why it fits the description best.

The other options don’t produce a continuing length that’s moved along a belt after forming: vacuum forming uses a heated sheet shaped over a mold, blow moulding forms hollow objects by blowing air into a hot parison, and injection moulding creates discrete parts that are ejected from molds rather than moved along a conveyor as a continuous extrudate.