Induction sealing is known for the last 40 years. Its main purpose is to provide the airtight sealing between plastic bottles and screw caps. It is used for medicines, chemicals, weed control substances, dairy products, mayonnaise, ketchup, sauces, coffee, tea, cocoa, hot chocolate, food oils, fruit juices, water, spices, motor oils, car engine additives, cleaning materials, etc.
The lids are provided with the induction innerseal. The bottle filling and sealing are performed on the existing production line. As the bottles go under the induction head, the aluminum layer in the cap is heated by the strong electromagnetic field to 170-190 degrees Celsius without a contact. As a result of the temperature and the pressure, existing as the caps are screwed on, the IHS foil gets sealed to the bottles.
The materials, used in the liner depend on the material of the bottles as well as the product being sealed. The most common wads are made up of three layers - paper or polymer, aluminum foil, and thermosealable layer. For more information, please refer to the
MEYER web site - one of the bigest suppliers of induction sealing foil.
