METHOD AND APPARATUS FOR FORMING SMOOTH BELLS IN THERMOPLASTIC MATERIAL PIPES

Method and apparatus for forming smooth bells in thermoplastic material pipes (3), according to which the free end (2) of a pipe (3) is inserted between an outer matrix (26) and an inner spindle (37) so as to define a first variable-volume chamber (57) with the inner spindle (37) and a second variab...

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Bibliographische Detailangaben
1. Verfasser:	TABANELLI, Giorgio
Format:	Patent
Sprache:	eng ; fre ; 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:	Method and apparatus for forming smooth bells in thermoplastic material pipes (3), according to which the free end (2) of a pipe (3) is inserted between an outer matrix (26) and an inner spindle (37) so as to define a first variable-volume chamber (57) with the inner spindle (37) and a second variable-volume chamber (58) with the outer matrix (26), and which is shaped against the outer matrix (26) by a fluid under pressure supplied to the first variable-volume chamber (57) by means of two supply circuits (53, 59) connected to the first variable-volume chamber (57) at different distances (D1, D2) from an end face (39b) of the inner spindle (37) itself.