Abstract: The present invention relates to a device for building ventilation, having heat recapturing, wherein the heat of the room air that is fed outside is recaptured, and cold outside air being fed inside can be preheated by means of the recaptured heat.

Abstract: The invention relates to a needle-sealed nozzle (10) for an injection mould whose injection nozzle (20) for introducing a fluid molten material (S) into a mould cavity (50) can be sealed on the end thereof by a closing needle (30). Said closing needle is provided with an injection channel (60) extending to an outlet orifice (62) for injecting a fluid (F) into the molten material (s) which is introduced into the mould cavity. Said outlet orifice is formed on the end face (34) of the closing needle for the molten material and can be closed by a fluid closing needle (64) which is axially displaceable in the closing needle for the molten material (30) can be moved from an opening position to a first and second closing position by a drive (40) For this purpose, the cylindrical closing part (33) of the closing needle (30) enters, in an accurately adjusted manner, a sealing seat (D) which is preferably formed in the injection nozzle (20) or in the end bit (23) of the nozzle.

Abstract: A process for producing physically foamed injection molded articles is provided. The process involves feeding a propellant-free thermoplastic melt into a cavity followed by delivering a physical propellant directly into the cavity or directly into the melt flowing into the cavity. The pressure exerted on the propellant during the injection stage is greater than that exerted on the propellant during the holding phase.

Abstract: A method and apparatus for producing an injection moulded plastics article comprises introducing a supply of plastics material (20) into a mould space (13), supplying a first stream of pressurised fluid into the molten plastics material to form a fluid containing cavity (25) therein, maintaining fluid pressure in the cavity until the plastics material can sustain the form dictated by the mould surface. During the step of maintaining fluid pressure in the cavity, at least a portion of the first stream of pressurised fluid is vented or allowed to vent from the cavity, and simultaneously a second stream of pressurised fluid from a second source (26; 40; 41) is supplied to the cavity, which second stream replaces that portion of the first stream which has vented from the cavity.

Abstract: The invention relates to a method for the production of a cork-like closure for bottle-like containers, by means of a physical blowing agent and said cork-like closures obtained by said method.