1. Keep products fresher for longer shelf life.
2. Protects product from leakage to reduce spillage.
3. Provides a tamper evident seal for consumer protection.
4. It reduces pliferage.
5. It will make your customers more confident in the products purity.
The caps that are used in the induction sealing process have the inner seal inserted
in the cap by the cap manufacturer. There are two general types. The first is called a
two piece inner seal. This seal has a foam or cardboard layer or foam, a layer of wax,
a layer of aluminum foil, and a layer of plastic. After sealing, the cardboard or
foam is left in the cap to provide a gasket so that the cap can be resealed after
the seal has been broken.
The second general type is called a single piece inner seal, which does not leave any
material inside the cap after it is removed. There are several variations, and your
cap supplier should be consulted to determine the best type for your application.
Induction sealing is done by an inductive coil inside the sealing head that creates an electromagnetic field when it is energized by electric current. The electromagnetic eddy field causes the aluminum foil to heat. This causes the plastic coating, on the foil, to melt and adhere to the lip of the container opening- forming a seal.
The actual seal is caused by the heating of the aluminum foil and the induction system is only the method of heating the aluminum foil.
Because the aluminum foil requires a certain amount of energy to become heated to a
certain temperature, there are four important variables.
~ The energy of the coil. This is usually indicated in watts.
~ The distance of the foil seal from the electromagnetic coil.
~ The time that the foil seal is within the electromagnetic field.
~ The mass (size) of the cap and the seal itself.
The machine should be adjusted so that the coils in the machine are as close as possible to the seal, and the coils are the correct energy level for the size of the cap and the length of time that the cap will be in the electromagnetic field. For example, larger caps will require stronger coils and faster line speeds require longer coils and/or more powerful coils.
The caps must be tight so that the aluminum foil is touching the lip of the container. If there is no contact, the seal will not be completed- whether or not the machine is operating correctly.
In models which mount the coil unit above the conveyor, the induction coil unit must be adjusted so that it is as close as possible to the caps as they move below the coil unit.
INDUCTION SEALING EQUIPMENT CAPPING MACHINERY HOME REQUEST INFORMATION