Nozzle handling polymers, e.g. for injection molding elastomers, includes a separately controllable embedded electric heating element

• Main Author: MASBERG, ULLRICH
• Format: Patent
• Language: English; German
• Published: 29.03.2007
• Subjects: 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

An injection nozzle for tools handling polymers incorporates an embedded electric heating element (2) that can be controlled separately and operates at high temperature, e.g. 800 [deg]C, to provide brief infra-red heating. The transparent nozzle body (1) is anisotropic and has a higher conductivity at right angles to the nozzle bore. The outer surface has a reflective coating (3). The nozzle bore can be sub-divided. The nozzle bore (di) can be up to 15 mm and the proportions of outer diameter (Da), height (H) and step diameter (Di) are 1.2 = Di/di = 3, 1.0 = Da/Di = 2, and 0.3 = H/Di = 2. Heating can be intermittent or pulsed to coincide with injection. Die Erfindung beschreibt Einsatz und Aufbau beheizbarer Einspritzdüsen (1) zur Verarbeitung vernetzender Polymere, insbesondere Elastomere, in Werkzeugen zur Herstellung von Formteilen. Hierzu wird erfindungsgemäß die polymere Flüssigkeit kurzzeitig, unmittelbar vor dem Eintritt in die Formnester des Werkzeuges durch einen hohen Energieeintrag erwärmt.