Induction heating apparatus and method of securing two workpieces or sheets

A device for inductively heating and fusing thermoplastics includes an alternating current passing through a tank circuit, the inductor member of the tank circuit being wrapped around a curved pole piece of a ferromagnatic material. The magnetic flux arising within the inductor coil member (29) flow...

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Bibliographische Detailangaben
Hauptverfasser:	BUCKLEY, JOHN D, SWAIM, ROBERT J, FOX, ROBERT L
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING ELECTRIC HEATING ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS 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:	A device for inductively heating and fusing thermoplastics includes an alternating current passing through a tank circuit, the inductor member of the tank circuit being wrapped around a curved pole piece of a ferromagnatic material. The magnetic flux arising within the inductor coil member (29) flows to the ends of the pole piece (20) and is formed into a screen (45) placed between the materials to be joined. The flux induces a current in the screen, and heat is generated to melt the thermoplastics (41, 43) together. Only 30-150 watts of power need be passed through the tank circuit, as a wire which will remain cool under operational wattage may be selected, making air or fluid cooling unnecessary. The device can be used for joining thermoplastic workpieces, or for joining non-thermoplastic workpieces by means of a fastener containing thermoplastic material.