Plastic extrusion molding refers to which process?

• A. A method of forming items by injecting molten plastic into a die.
• B. A surface made smooth and glossy usually by friction; burnished.
• C. A finish produced by electrolytic plating.
• D. A leak resistant zipper bag used for body removal.

Answer: (A)

Injection molding involves injecting molten plastic into a mold (die) under pressure, where the material cools and solidifies to take the final shape. This method is ideal for producing many parts with complex geometry and tight tolerances in high volumes. The other descriptions refer to unrelated concepts—a burnished surface, an electroplating finish, or a specialized bag—none of which describe a plastic molding process.