Induction coil sealing equipment

A single turn induction coil (12) which provides uniform sealing of lids (23) to plastic containers (22). A first end (34a) of the coil overlaps a second end (34b) of the coil with the ends being tapered to form a single complete ring. An electrical current is coupled to the overlapped portions of t...

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Bibliographic Details
Main Authors FANG, JIN-LIOU, ROUGH, J. KIRKWOOD H
Format Patent
LanguageEnglish
French
German
Published 08.05.1991
Subjects
AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
CONVEYING
ELECTRIC HEATING
ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
HANDLING THIN OR FILAMENTARY MATERIAL
MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGINGARTICLES OR MATERIALS
PACKING
PERFORMING OPERATIONS
SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR
SHAPING OR JOINING OF PLASTICS
STORING
TRANSPORTING
UNPACKING
WORKING OF PLASTICS
WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Summary:A single turn induction coil (12) which provides uniform sealing of lids (23) to plastic containers (22). A first end (34a) of the coil overlaps a second end (34b) of the coil with the ends being tapered to form a single complete ring. An electrical current is coupled to the overlapped portions of the first and second end of the coil so the electrical current flows for more than 360 DEG around the coil (12). This provides an induced electrical current around a container lid (23) adjacent to the coil and provides heating of the complete circumference of the lid. A variety of shapes of containers and matching lids can be used with the present invention.
Bibliography:Application Number: EP19900120699