Different types of molds
Moules pour l'injection des thermoplastiques

Polymer injection molding relies on temperature-dependent changes in polymer properties: in the press barrel, molten polymers are viscoelastic, compressible fluids, and are transferred in this state to the mold cavities.

The mold is maintained at a temperature below the glass transition temperature T_g for amorphous polymers and below the crystallization temperature T_c for crystalline polymers. In the mold, the polymer temperature falls below T_g for amorphous polymers and below T_cfor crystalline polymers: the polymer enters the solid state.

The injection-molded parts, formed by the plastic material solidified in the cavities, are extracted from the mold by means of a mold opening and an ejection device.

The injection...