Abstract: A process is presented for fabricating composite bodies of thermoplastic material including a foamed core bonded to a compatible thermoplastic sheet. A sheet of thermoplastic material is first preheated and then thermoformed on a first half-mould. The first half-mould with the thermoformed sheet is positioned opposite a second half-mould to form a hollow chamber therebetween. A foamable thermoplastic material containing one or more liquid hydrocarbons is injected into the hollow space at a temperature sufficiently high to permit the foamable material to expand and bond to the thermoformed sheet.

Abstract: The invention concerns a bumper or front piece for motorvehicles, consisting of a bumper or the like of an open cross-section, substantially C-shaped, closed on the rear in a removable way by a reinforcing plate or wall of varying thickness, consisting of a substantially straight lamina having at its opposite ends at least one enlargement radiused through a slanting plane to said lamina and being provided with suitable means for the steady anchoring of the whole reinforcing piece to the bumper itself, so as to obtain a reinforcing wall of such a shape or profile as to effectively oppose flectional and shearing stresses on the supports, said reinforcing wall having along its longitudinal edges elastic coupling means with suitable gains, with other means provided along the longitudinal edges of the bumper, so as to achieve a mechanical coupling capable of ensuring the solidarity between the jointed parts and contemporaneously to resist longitudinal tangential stresses.