Abstract: The invention relates to a process for the manufacture of composites from cores and facings with a liquid and/or pasty adhesive. The core is wetted with a liquid which also serves as a solvent and/or wetting agent for the adhesive.

Abstract: The efficiency of equipment for heating process water and containing a solar collector can be substantially improved by connecting a solar collector of low volume but large surface with a reservoir of variable volume in such a manner that fresh water can be fed directly to the collector, but fresh water is not fed to the system in substantial amounts on removal of hot water as long as a certain minimum amount of water is present in the reservoir. Thus, an amount of water corresponding to the charge of the reservoir can be removed from the equipment at a constant temperature.

Abstract: The apparatus for welding articles of thermoplasts using additional welding material is provided with a special melting device for the welding material. The melting device comprises a guide channel for the supply and preheating of the welding material, which channel merges into a melting channel of diminishing cross section closed at one end. The melting channel is provided with lateral bores which discharge into a melting chamber of low height in communication with a collecting zone for the plasticized welding material, which collecting zone is connected with the outlet opening of the welding shoe.