VORRICHTUNG UND VERFAHREN ZUR EXTRUSION VON BLEISTIFTEN

An apparatus for extruding pencils and a method of using the apparatus. A core material (6) is extruded from an extruder (1) and forms a catenary loop in a cooling zone (4). The core material is carefully cooled at ambient temperature before being cooled and straightened at a cooling unit (5). The c...

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Bibliographische Detailangaben
1. Verfasser:	MILLER, EDWARD JAMES DOUGLAS
Format:	Patent
Sprache:	ger
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING BUREAU ACCESSORIES IMPLEMENTS FOR WRITING OR DRAWING 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 WRITING OR DRAWING IMPLEMENTS
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Beschreibung
Zusammenfassung:	An apparatus for extruding pencils and a method of using the apparatus. A core material (6) is extruded from an extruder (1) and forms a catenary loop in a cooling zone (4). The core material is carefully cooled at ambient temperature before being cooled and straightened at a cooling unit (5). The core material is coated in a crosshead and die assembly (8) with sheath material extruded from extruder (10). In a further cooling zone (12) the sheath material expands under the action of a blowing agent and the extrudate is sized by a calibrator (13).