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Enercon's line of air cooled cap sealers are responsible for sealing over 5 billion containers around the world. This expertise in induction sealing is now available for capless applications.
The principles of induction sealing do not change for capped or capless sealing. Pressure, heat and time are the three key variables required to effectively seal containers.
Induction has long been a popular choice of packagers with capped products. Now that induction is available for capless applications users of conduction sealing equipment will be pleasantly surprised at the simplicity of the induction process.
Induction's benefits over conduction
One of the primary benefits of induction over conduction is that the sealing head is more forgiving of containers out of tolerance. Conduction relies on a hard metal plate making perfect contact with the container to be sealed. Induction technology utilizes a pad which can mold to the contour of a container that is out of specifications.
Induction offers instant start-up without the system warm-up production delays required by conduction systems. Complex temperature sensors and heaters are also not required.
Lower energy requirement is another advantage of induction technology. Induction needs only enough power to heat the foil seal - not an entire sealing element as with conduction. This translates into substantial energy savings. Induction sealing components operate at 1/10th of the power required by conduction components.
And, since only the foil is being heated, the system is safer and cleaner than conduction systems.
Anatomy of an induction sealer
So what are the major components of an induction sealer? The standard induction sealer has two main components, the power supply and the sealing head.
The power supply is an electrical generator capable of operating at the medium to high frequencies required for the induction sealing process. It supplies the induction sealing head with the current necessary to create the electromagnetic field. The power supply rating required for a specific application will depend upon the size of the closures and the speed of the production line.
The sealing head consists of a plastic housing with a conductor wound to form an inductive coil inside. The head produces an electromagnetic field when energized by the power supply.
The cap in a cap sealing application provides the pressure required. As with conduction sealing, induction sealing of capless containers requires a third component to apply pressure to the foil liner.
Enercon has worked extensively with the leading manufacturers of conduction sealing systems in order to take advantage of existing rotary and indexing sealing technologies.
The same techniques used for maintaining liner pressure that are used in conduction sealing may be used for induction. Because of this Enercon can actually retrofit induction sealing heads into existing conduction sealing systems.
Enercon offers a variety of unique sealing solutions for capless containers and capped containers without sufficient application torque for traditional induction sealing.
For low-production and laboratory use Enercon offers the table-top Pneumatic Jr induction sealer. This unit uses pneumatics to lower the sealing head and to provide the pressure required for sealing. Our Pressure-Belt system is also available for snap-on caps. Visit these pages and our capless product home page for more information or email us today!
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