How Does Induction Sealing Works?

Induction sealing is an electromagnetic works process and widely used sealing method due to its efficiency, reliability, and tamper-evident properties.

Reviewed by Mingchong Lee, Senior Engineer Working in Packaging Machine Industry Over 20 years.

Induction sealing uses electromagnetic induction to create an airtight seal between a container and its closure, such as a cap or lid. It is available in industries where product freshness and tamper evidence are essential, such as the pharmaceutical, food, and beverage industries.

Here following is a general overview of how induction sealing works:

Induction foil liner:

Above all, a foil liner is essential. The closure, typically made of plastic material, is equipped with a thin foil liner that contains a layer of heat-sealable material. Having this liner inside the cap or cap is a prerequisite.

Electromagnetic induction:

The container will inline pass or handhold position under an induction sealing machine head. The machine consists of an induction coil that generates an alternating magnetic field.

Heating process:

When the machine is activated, the alternating magnetic field from the coil interacts with the metallic foil liner, inducing electrical currents within it. This process is known as electromagnetic induction.

Heat transfer:

The electrical currents generated in the foil liner cause resistance and produce heat due to the material’s electrical resistance. The heat will transfer from the liner to the heat-sealable layer facing the container.

Sealing process:

The heat-sealable layer, which is usually a polymer material, melts and adheres to the container’s rim or land area. The heat localizes to the contact area between the liner and the container, ensuring a secure and reliable seal.

Cooling and solidification:

The sealed area quickly cools down and solidifies after the heat, creating a tight bond between the container and the closure. This airtight seal helps to preserve the product’s freshness, prevent leakage, and provide tamper evidence.

In conclusion, induction sealing is an electromagnetic works process for sealing aluminum foil. Induction sealing is a widely used sealing method due to its efficiency, reliability, and tamper-evident properties. It allows for a consistent and uniform seal across various container sizes and shapes, ensuring product integrity and safety.

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