Which process heats a thermoplastic until soft and then bends it at any chosen angle?

• A. Line bending
• B. Line forming
• C. Extrusion
• D. Blow moulding

Answer: (A)

Line bending is about softening a thermoplastic along a defined line and bending it to a chosen angle. By applying heat with a strip heater, the plastic along that line becomes pliable while the surrounding areas stay rigid, allowing a precise bend. Then the part is held in the desired position until it cools and hardens, fixing the angle. This is different from extrusion, which pushes material through a die to make continuous shapes, or blow moulding, which inflates a heated parison inside a mold to form hollow parts. So the described process is line bending.