Abstract: A process for the production of a hollow structural column or rod in polymers includes the steps of assembling two or more elongated modules, each one provided with male-female truncated cone-shaped terminal parts. The inner surface of the ‘female’ terminal part has a taper angle that is identical to the taper angle of the outer surface of the ‘male’ terminal part. The process also includes the following steps: aligning the hollow modules; preparing the male and female terminal parts for adhesive bonding and insertion in the terminal part of the adjacent, aligned module; applying, preferably at the ends, an axial compression device, so that on compression of the ends of the rod made up of the modules, each external male tapering surface adheres to and exerts a suitable pressure on the internal female tapering surface of the adjacent module; and curing the adhesive.

Abstract: The invention is a new process for the production of a hollow structural column or rod in polymers, obtained by assembling modules having shorter length, comprising two or more elongated modules, each one provided with male-female truncated cone-shaped terminal parts (56, 56), wherein the inner surface of the “female” terminal part (56) has a taper angle that is identical to the taper angle of the outer surface of the “male” terminal part (53), and comprising the following steps: aligning said hollow modules; preparing said male and female terminal parts with adhesive for glueing and insertion in the terminal part of the adjacent, aligned module; applying, preferably at the ends, an axial compression device, so that on compression of the ends of the rod made up of said modules each external male tapering surface adheres to and exerts a suitable pressure on the internal female tapering surface of the adjacent module during the structural joining and glueing of the terminal parts and the polymerisation of the a

Abstract: The invention is a new process for producing monolithic hollow wheels in resin reinforced with fibres and polymerised at high pressure, comprising two half-moulds (Sa, Sb) each shaped according to one part of the negative outline of the wheel to be produced, with the respective spokes and hub, one or more tubular plastic bags (G1), an external plastic bag (G2). The layers of fibre and resin (M) are laid in the grooves (S1) of the two half-moulds (Sa, Sb) so as to protrude or project beyond the coupling surface. One or more tubular bags (G1) are inserted in a half-mould (Sb), so as to occupy all the areas that must be hollow, and with at least one open end protruding from the half-mould (Sb). The two half-moulds (Sa, Sb) are closed and put into the external bag (G2). The assembly of the bags (G1, G2) and of the half-moulds (Sa, Sb) is treated in an autoclave, connecting the environment between the external bag (G2) and the internal bags (G1) to a suction pump.