Extruded plastic pipes

A large tube is extruded from a nozzle, calibrated stretched and cooled. The whole structure is reheated and reduced to the desired size by centrifugal force. The tube is then cooled around a calibrating mandrel, upon which it is finally shrunk and solidified. Specifically the pipes may be polypropy...

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Bibliographische Detailangaben
1. Verfasser:	DANZER,JOSEF-HELMUT
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING MAKING GRANULES OR PREFORMS PERFORMING OPERATIONS PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS 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:	A large tube is extruded from a nozzle, calibrated stretched and cooled. The whole structure is reheated and reduced to the desired size by centrifugal force. The tube is then cooled around a calibrating mandrel, upon which it is finally shrunk and solidified. Specifically the pipes may be polypropylene or polyethylene.