PROCESS FOR THE PRODUCTION OF MOLDER ARTICLES BY DEEP-DRAWING PREFABRICATED POLYURETHANE PARTS

The invention is directed to a process for the production of molded articles by deep-drawing a prefabricated polyurethane(urea) part produced from a polyisocyanate polyaddition product having a specific gravity of at least 0.8 g/cm3. The part is placed inside a deep-drawing mold and pressed at a tem...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	THOMAS-ELSNER, EBERHARD, JURGENS, JURGEN, FAEHNDRICH, WERNER-RASSHOFER, JOACHIM, WAGNER
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	The invention is directed to a process for the production of molded articles by deep-drawing a prefabricated polyurethane(urea) part produced from a polyisocyanate polyaddition product having a specific gravity of at least 0.8 g/cm3. The part is placed inside a deep-drawing mold and pressed at a temperature of up to 230 DEG C. and a pressure of up to 1,000 bar. After the deep-drawing process, the part is subjected to a dwell time of at least 10 seconds at a temperature of up to 230 DEG C. and a pressure of up to 1,000 and is immediately thereafter removed from the mold.