Abstract: Moulds for injection molding of plastic parts comprising a die and a punch which define, in the closed mould condition, a cavity intended to receive plastic material injected by a press are provided. The punch may comprise a central element and a pair of first lateral elements arranged on longitudinally opposite sides relative to the central element, each of the first lateral elements being slidably guided along a respective inclined lateral surface of the central element to be displaced between a moulding position and an ejection position.

Abstract: A method and apparatus is described for polymerization of adhesive interposed between two superimposed elements, in particular the outer and inner plastics material panels of a motor vehicle body door element; two superimposed elements are clamped, around respective portions thereof between which an adhesive substance is interposed, between respective regions of a mould and a presser device which match the profile of the said portions and are provided with internal heating devices; the heating regions of the mould are rigidly supported thereby whilst the heating regions of the presser device are defined by rods which are independently axially slidable against the action of resilient biasing means; the presser device is compressed with a predetermined pressure against the mould and, simultaneously, heat is introduced in a differentiated manner from region to region by the internal heating devices.