Method and apparatus for detecting holes in plastic containers

A method and an apparatus for monitoring the production of blow molded plastic containers ( 20 ) includes a columnator ( 26 ) and sound detector ( 24 ) responsive to a defect sound of pressure fluid escaping from a container being formed in a mold cavity ( 14 ). The columnator is effective to filter...

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Bibliographische Detailangaben
Hauptverfasser:	HAYWARD DONALD W, MILLER DONALD WAYNE, BOGSTAD DAVID A
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING PERFORMING OPERATIONS PHYSICS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TESTING TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	A method and an apparatus for monitoring the production of blow molded plastic containers ( 20 ) includes a columnator ( 26 ) and sound detector ( 24 ) responsive to a defect sound of pressure fluid escaping from a container being formed in a mold cavity ( 14 ). The columnator is effective to filter the defect sound from ambient noise. An output signal generated by the sound detector is processed to generate a control signal used to reject a defective container. Preferably, the open end of the columnator is positioned between 20° and 150° from the preform loading station in a rotary platform ( 12 ) blow molding machine.