Abstract: Process for unifying under heat thin structures (20) of synthetic material such as woven and non-woven fabrics, moquettes and other kinds, with manufactured products (13) made of plastic material, especially by means of well-known techniques such as molding, vacuum forming, thermoforming, calendering and others, the process consisting in the fact that the thin structure (20) is made heat-conducting by treatment with emulsions, pastes etcetera containing water, metals, heat-conducting products generally, and is made to adhere to a wall (17) of metal or of some other highly heat-conducting material, so that, during the unifying process the heat transferred from the plastic material forming the manufactured product (13) to the aforesaid thin structure (20) passes rapidly from the latter to the heat-conducting wall (17) thus preventing said structure (20) from becoming overheated and damaged.