Which process forces heated plastic granules into a mould cavity to form products?

Which process forces heated plastic granules into a mould cavity to form products?

• A. Injection moulding
• B. Extrusion
• C. Blow moulding
• D. Rotational moulding

Answer: (A)

The process being described is injection molding. In this method, plastic granules are fed into a heated barrel where they melt. A screw or plunger then pushes the molten plastic under high pressure through a nozzle and into a closed mold cavity. The material cools and solidifies inside the mold, the mold opens, and the finished part is ejected. This approach is ideal for high-volume production of parts with intricate shapes and tight tolerances because the mold defines the exact geometry and the process can consistently reproduce complex features. It differs from extrusion, which pushes molten plastic through a die to create continuous shapes; blow molding, which forms hollow objects by inflating a softened plastic inside a mold; and rotational molding, which builds up a part by repeatedly heating and rotating a mold to coat its interior.

The process being described is injection molding. In this method, plastic granules are fed into a heated barrel where they melt. A screw or plunger then pushes the molten plastic under high pressure through a nozzle and into a closed mold cavity. The material cools and solidifies inside the mold, the mold opens, and the finished part is ejected. This approach is ideal for high-volume production of parts with intricate shapes and tight tolerances because the mold defines the exact geometry and the process can consistently reproduce complex features. It differs from extrusion, which pushes molten plastic through a die to create continuous shapes; blow molding, which forms hollow objects by inflating a softened plastic inside a mold; and rotational molding, which builds up a part by repeatedly heating and rotating a mold to coat its interior.