One of the most common forms of plastics processing is injection moulding. For decades now the plastic, delivered in pellet form, has been prepared in the machine and brought to the correct processing consistency and temperature. The plastic is then injected under high pressure via the injection nozzle into the mould containing the negative image of the product and is pressed against the contour. The mould is filled. A specially designed cooling system already solidifies the plastic at the necessary points during the moulding process. When the two-piece mould is opened, the product is ejected or removed from the mould by a handling robot. As the mould can contain several cavities, different product geometries can be created.
Foamed products can also be manufactured using this technology. Density-reduced parts with integral foam structure, i.e. with closed surface and internally closed cellular foam, can be produced by injecting a blowing agent.