Foil tube prodn - from thermoplastic synthetic material esp polypropylene

After leaving the annular extruder nozzle, the tubing is widened by blowing in gas and then collapsed between tapering walls into a double strip for reeling in. It is cooled both internally and externally by immersion in a bath of liquid whose level may be regulated. Double walled material is made b...

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Bibliographische Detailangaben
1. Verfasser:	WILD,KURT
Format:	Patent
Sprache:	eng ; 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:	After leaving the annular extruder nozzle, the tubing is widened by blowing in gas and then collapsed between tapering walls into a double strip for reeling in. It is cooled both internally and externally by immersion in a bath of liquid whose level may be regulated. Double walled material is made by simultaneous coaxial extrusion of two tubes, gas being blown into the annular gap and separate gas and coolant feed channels are provided in the extrusion head. Improved product quality esp. transparency, due to prevention of surface crazing by uniform cooling.