Discussion

Match the following processing operations with their respective tools:

Processing operations	Tools
P. Injection molding	1. Parison mold
Q. Twin screw extrusion	2. Sprue-runner system
R. Blow molding	3. Mixing head
S. Reaction injection molding	4. Kneading blocks

Answer: B

The match is P-2, Q-4, R-1, S-3.

Injection moulding feeds the melt from the nozzle to the cavities through a sprue and runner system.
Twin screw extruders use kneading blocks on the screws to mix and disperse fillers and additives.
Blow moulding inflates a tube of molten plastic, the parison, inside a mould.
Reaction injection moulding meets two liquid reactants (as for polyurethane) at high pressure in a mixing head just before the mould.

The other options swap these tools between processes, for example giving a parison mould to injection moulding or kneading blocks to blow moulding.

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