Question

For the production of pipe one should use

• A. Calendering
• B. Extrusion
• C. Compression moulding
• D. Injection moulding

Hint:

PVC and HDPE pipes are commonly manufactured using extrusion.

Answer 1

The Correct Option is B

Step 1: Understanding pipe manufacturing.
Pipes require continuous hollow shapes with uniform cross-section along their length. This demands a process that can continuously form such shapes.
Step 2: Role of extrusion.
Extrusion involves forcing molten polymer through a die to produce long, continuous products like pipes, tubes, and rods with constant cross-section.
Step 3: Analysis of options.
(A) Calendering: Used for sheets and films, not pipes.
(B) Extrusion: Correct — Ideal for producing pipes and tubes.
(C) Compression moulding: Used for solid shapes, not hollow continuous products.
(D) Injection moulding: Used for discrete items, not continuous pipes.
Step 4: Conclusion.
Extrusion is the appropriate process for pipe production, making option (B) correct.