Which description matches Injection Moulding?

Which description matches Injection Moulding?

• A. Blow moulding uses a parison inflated inside a mold.
• B. Injection Moulding involves heating plastic granules until soft and injecting into metal moulds by a screw.
• C. Compression moulding places a slug or sheet of plastic between a two-part mould under pressure and heat.
• D. Blow moulding uses a screw to inject molten polymer.

Answer: (B)

Injection Moulding is the process where thermoplastic pellets are heated to a molten state and then forced into a metal mould under pressure by a screw mechanism. The screw not only feeds the material but also helps melt it as it moves forward, then the molten plastic is injected through a nozzle into the mould cavity. Once the material cools and solidifies, the mould opens and the finished part is ejected. This method is ideal for making large volumes of parts with high dimensional accuracy and the ability to form complex shapes in a single operation. The other descriptions describe different forming methods: inflating a softened parison inside a mould is blow moulding, not injection; using a slug or sheet between two halves with heat and pressure is compression moulding, another separate process; and saying a screw is used to inject molten polymer in blow moulding is inaccurate for that method.

Injection Moulding is the process where thermoplastic pellets are heated to a molten state and then forced into a metal mould under pressure by a screw mechanism. The screw not only feeds the material but also helps melt it as it moves forward, then the molten plastic is injected through a nozzle into the mould cavity. Once the material cools and solidifies, the mould opens and the finished part is ejected. This method is ideal for making large volumes of parts with high dimensional accuracy and the ability to form complex shapes in a single operation.

The other descriptions describe different forming methods: inflating a softened parison inside a mould is blow moulding, not injection; using a slug or sheet between two halves with heat and pressure is compression moulding, another separate process; and saying a screw is used to inject molten polymer in blow moulding is inaccurate for that method.