Abstract: Process for the production of thermoinsulating structural elements, which includes:a)producing by thermoforming a cell made of thermoplastic material;b)pulling on such cell on a male die half shell;c)closing the die with a negative half shell suitable to form a cavity between the half shells,d)inserting in the cavity bored hollow elementse)filling the cavity with foamed pearls in thermoplastic polymers;f)sintering the pearls with steam fed through hollow elements.g)cooling and extracting the hollow elementsh)extracting the structural element from the die.

Abstract: Process for preparing heat-insulating structural elements, which comprises the steps of:(a) applying to the convex portion of a first half-shell a layer of beads made from a semi-foamed or foamed thermoplastic polymer, in order to produce a layer with an essentially constant thickness;(b) sintering the beads; and(c) applying to the so obtained composite a second half-shell capable of fitting the shape of the sintered layer.