The GATE Grind

GATE 2020 PI – Question 23

Manufacturing Processes I · Polymers and Composites · 1 mark · Multiple choice

Which process makes long fibre-reinforced-plastic bars of uniform cross-section?

  1. Extrusion
  2. Pultrusion
  3. Injection moulding
  4. Thermoforming

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Show answer and explanation

Correct answer: (B) Pultrusion

Explanation

Pultrusion continuously pulls reinforcing fibres through resin and a shaping/heated die to form a constant section. This is particularly suited to long reinforced profiles. Thus B; extrusion pushes feed through a die rather than using the characteristic continuous-fibre pulling route.

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