Compression for plastic objectsVersion en ligne Understanding this industrial process for making plastic objects. par Manuel Jesús García Rodríguez 1 Plastic sample placed in the fixed part of the mould. 2 Heaters to soften the plastic sample. This way it's easier that plastic adopts the shape of the mould. 3 Mobile part of the mould, that presses the plastic against the fixed part of the mould. 4 Cool water through tubes around the mould, to solidify the plastic object