APPARATUS AND METHOD FOR PRODUCING MICROCELLULAR FOAMS

The invention discloses an apparatus for producing microcellular foams, the apparatus having an extruder cylinder (1) having an extruder screw (2) therein provided with a spiral flight (2b) and running around a core (2c), and a feeder unit (8) suitable for feeding a polymeric base material and conne...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	OKITA, Yutaka, INAMORI, Kojiro, GOMBOS, Akos, MAROSFOI, Botond, POMLENYI, Peter
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING 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 discloses an apparatus for producing microcellular foams, the apparatus having an extruder cylinder (1) having an extruder screw (2) therein provided with a spiral flight (2b) and running around a core (2c), and a feeder unit (8) suitable for feeding a polymeric base material and connected to an inlet (8a) formed on the cylinder (1) and communicating with an inner space (5) delimited by the cylinder (1) and the extruder screw (2), an extrusion outlet (8b) being formed on the cylinder (1), and the apparatus further comprising means for feeding a foaming agent into the inner space (5) and means for rotating the screw (2), in which the essence of the invention is that the means for feeding foaming agent is at least one nozzle (3a) connected to a bore hole (3), a nozzle orifice (3aa) of which, opening into the inner space (5), is situated between a surface (2c1) of the core (2c) and an inner surface (1a) of the cylinder (1) in such a way that the distance between the nozzle orifice (3aa) and the surface (2c1) is greater than 0.