What occurs during the moulding process?

During the moulding process, raw material is heated and then forced into a mould to take the desired shape. This process is integral to many manufacturing techniques, such as injection moulding, blow moulding, and compression moulding. In injection moulding, for example, plastic pellets are heated until they become malleable and then injected into a precisely crafted mould. The material cools and solidifies, forming the shape of the mould. This method is widely used for producing components with complex shapes and for mass production, offering high efficiency and uniformity in the finished products.

The other options describe different processes that do not accurately represent the moulding procedure. Extrusion involves forcing material through a die to create a continuous shape, such as a coil or sheet, rather than filling a mould. Cooling plastic into sheets is part of processes like thermoforming rather than moulding itself. Combining chemicals to produce a polymer is typically a part of polymerization rather than the moulding process, which focuses on shaping already processed material.