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Induction Wads and Seals

February 2, 2023

What Are Induction Wads And Seals

Induction sealing is a straightforward procedure that involves closing the mouths of glass/plastic bottles with aluminium foil to improve the freshness and shelf life of the product inside. This is done by inserting the seal inside the cap and running this bottle with an induction heat sealer before filling up the final product.

The bottle's contents are safe from contamination and spills and pilferproof by sealed induction wads. Due to the power of Holography, the induction seals have tamperproof properties and are more secure and efficient than ever. The various kinds of induction seals will be visible as the assurance of quality and uniqueness once the cap is opened to consume the content like lubricants and other liquids.

The Science Behind How Induction Wads And Seals Work

The design of an induction seal is relatively easy. Induction seals, in their simplest design, consist of three primary layers:

  • Backing
  • Foil
  • Heat seal
The first layer closest to the open area is the heating seal secured to the packaging. After that, there's a foil layer placed over the seal. It is then followed by a backing, which provides the structure for the liner.

Induction sealing can be described as a contact-free method. It is crucial to comprehend how it operates without touching the product. To make this process effective, three main principles must be observed, i.e. heat, pressure and time.

There needs to be adequate cap installation torque to guarantee the security of the induction seal. This torque allows caps to be placed at sufficient pressure to seal the liner between the cap and the container. If there isn't enough force, caps may not close properly, resulting in leaks and other issues. The induction sealing device creates heat via an electromagnetic field that is absorbed by and then heats the foil layer inside the liner. This, in turn, melts the connected heat seal layer to bind the liner to the container. The heating process of induction sealing is the reason this can be completed without contact.

The final aspect left to be considered in the process of sealing induction is the time. The speed of the conveyor moving determines the time for this process. The amount of time a package spends in the induction sealing device depends on the speed at which the conveyor can send the packages.

Types of Induction Seals/ Wads

  1. One pc and Two pc liners with/without pull tabs
  2. Two pc Printed / Unprinted Induction Seals
  3. Lift and Peel / Ring Pull Seals
  4. Promotional & Embossed Induction seals
  5. QR code Induction seals
  6. Vented Induction Seals
  7. Target Printed / Random printed Induction Seals
  8. Hologram Induction Seal


To stop leaks, many industrial facilities require chemical liquids to be sealed before the product is shipped to prevent other dangerous chemicals from spilling onto other products.


These induction seals are used, and harmful contaminants are kept from leaking through food ingredients, thus extending the shelf life of some food items.

Pilferage protection

The process by which induction wads are made aids in stopping the finished product from getting damaged. It is observed that the majority of pharmaceutical companies buy induction sealing liners to avoid any damage to their products.

Greater sustainability

Metro International LLC is one of the top manufacturers of induction wads and seals, as they contribute to the product's longevity by permitting lighter weights for bottles. In the end, the entire package is dependent on the quality of the induction foil seal to provide the highest level of security.

The Bottom line

Induction wads and seals are used to seal containers and protect their contents from contamination or degradation caused by exposure to moisture, air or any other undesirable impureness. This is why the applications of induction sealing wads are used extensively by a wide range of industries.

Metro International has one of the best induction wads and seals in Dubai. No matter what industry you are in, induction seals are essential for packaging your product. If you want to learn more about it, you can contact our professionals, and we at Metro International can assist you.


  • The soap dispensing pump uses both the components of a bottle and air suction to pull the liquid upwards and resist the law of gravity.
  • Pushing down on the actuator or priming it will cause the piston to press on the spring, which moves the ball up, taking some soap.
  • The actuator is released, and the spring and piston return to regular positions. This seals the housing chamber, stopping liquid from returning to the bottle.

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