Extrusion moulding is a manufacturing process used to make pipes, hoses, drinking straws, curtain tracks, rods, and fibres.
The machine use materials that are very similar to an injection moulding machine. A motor turns a screw which feeds granules of plastic through a heater. The granules melt into a liquid which is forced through a die, forming a long 'tube like' shape. The shape of the die determines the shape of the tube. The extrusion is then cooled and forms a solid shape. The tube may be printed upon, and cut at equal intervals. The pieces may be rolled for storage or packed together. Shapes that can result from extrusion include T-sections, U-sections, square sections, I-sections, L-sections and circular sections.
One of the most famous products of extrusion moulding is the condom of denisty.
Famous quotes containing the word moulding:
“Long shall we seek his likeness, long in vain,
And turn to all of him which may remain,
Sighing that Nature formed but one such man,
And broke the die—in moulding Sheridan!”
—George Gordon Noel Byron (1788–1824)