A toothpaste tube can be produced by

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ESE Mechanical 2014 Official Paper - 2
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  1. solid forward extrusion
  2. solid backward extrusion
  3. hollow backward extrusion
  4. hollow forward extrusion

Answer (Detailed Solution Below)

Option 3 : hollow backward extrusion
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ST 1: UPSC ESE (IES) Civil - Building Materials
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Explanation:

Toothpaste tube can be produced by backward hollow extrusion also known as impact extrusion.

In impact extrusion, a heavy punch is allowed to fall over the material/billet and the material/billet takes the shape of the die. Collapsible tubes are made by this process. This process is limited to soft and ductile materials.

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