Which process uses heated moulds to press a thermosetting plastic together under high hydraulic pressure?

Which process uses heated moulds to press a thermosetting plastic together under high hydraulic pressure?

• A. Compression moulding
• B. Vacuum forming
• C. Injection moulding
• D. Extrusion

Answer: (A)

Compression moulding uses heated moulds and high hydraulic pressure to shape and cure thermosetting plastics. In this process, a preheated resin preform is placed into a heated mold, the mold is closed, and a hydraulic press applies strong pressure. The heat initiates curing and the pressure forces the material to fill the cavity completely, causing crosslinking so the part hardens into a solid, dimensionally stable shape with a good surface finish. This approach is ideal for thicker sections and larger parts where the resin needs to cure in the mold. By contrast, vacuum forming relies on a heated sheet shaped by vacuum, injection moulding injects molten polymer into a mold (usually thermoplastics), and extrusion pushes material through a die to form continuous profiles, none of which involve the closed-mold curing with high hydraulic pressure characteristic of compression moulding.

Compression moulding uses heated moulds and high hydraulic pressure to shape and cure thermosetting plastics. In this process, a preheated resin preform is placed into a heated mold, the mold is closed, and a hydraulic press applies strong pressure. The heat initiates curing and the pressure forces the material to fill the cavity completely, causing crosslinking so the part hardens into a solid, dimensionally stable shape with a good surface finish. This approach is ideal for thicker sections and larger parts where the resin needs to cure in the mold. By contrast, vacuum forming relies on a heated sheet shaped by vacuum, injection moulding injects molten polymer into a mold (usually thermoplastics), and extrusion pushes material through a die to form continuous profiles, none of which involve the closed-mold curing with high hydraulic pressure characteristic of compression moulding.