METHOD AND DEVICE FOR THE DISCONTINUOUS PRODUCTION OF HEAT-INSULATED PIPES

• Main Authors: WELTE, RAINER, KREUER, KARL-DIETER, MUELLER, WOLFGANG, BRUENINGHAUS, PATRICK, NAPP, REINER, DUSCHANEK, HELMUT
• Format: Patent
• Language: English; French; German
• Published: 17.08.2000
• Edition: 7
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; BLASTING; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; JOINTS OR FITTINGS FOR PIPES; LIGHTING; MEANS FOR THERMAL INSULATION IN GENERAL; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PIPES; PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; THERMAL INSULATION IN GENERAL; TRANSPORTING; WEAPONS; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

Sogenannte wärmegedämmte Doppelrohre (5, 6) mit einer Wärmedämmschicht (15) aus Polyurethan-Hartschaumstoff lassen sich mit verbesserter Dämmwirkung und ohne Wärme- bzw. Kältebrücken dadurch herstellen, dass die Rohre (5, 6) vor dem Ausschäumen des dazwischenliegenden Zwischenraumes (11) getrennt voneinander ausgerichtet werden, um durch vorherige Lagerung entstandene Durchbiegungen zu eliminieren, und dass der Zwischenraum (11) des fertigen Doppelrohres (5, 6) nur mit Polyurethan-Hartschaumstoff ausgefüllt ist. The invention relates to so-called heat-insulated double pipes (5, 6) which have a heat-insulating layer (15) consisting of rigid expanded polyurethane. Pipes of this type can be produced with an improved insulation effect and without heat bridges or cold bridges by positioning the pipes (5, 6) separately from each other before the intermediate space (11) between them is filled with foam in order to eliminate any deflection that has arisen as a result of their previous storage, and by filling the intermediate space (11) of the finished double pipe (5, 6) with rigid expanded polyurethane only. L'invention concerne des tuyaux doubles calorifugés (5, 6) comportant une couche calorifuge (15) de mousse de polyuréthane rigide, qui possèdent un effet calorifuge amélioré et sont dépourvus de ponts thermique. Pour fabriquer lesdits tuyaux (5, 6), on redresse chaque tuyau séparément avant de remplir de mousse l'espace intermédiaire (11), de façon à éliminer les courbures générées par le stockage préalable; puis on remplit ledit espace intermédiaire (11) du tuyau double fini (5, 6) uniquement avec de la mousse de polyuréthane rigide.