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There are Steps to Getting the Right Induction Cap Seal

What cap sealing does is create an airtight seal. It is accomplished by moving a capped bottle beneath the induction sealer without making contact with it. The sealing head of the sealer generates an electromagnetic field to heat the foil liner within the cap. This hot foil thaws the polymer veneer on the inner-seal. The combination of the heat and the cap’s pressure makes the inner-seal secure with the container lip. An airtight seal forms as a result. Now, we see what goes into getting the right cap seal.

The liner that is needed for an application

What Induction sealing does is thwart leaks and keep product freshness. Packagers must state whether they want the induction liner to peel away neatly or leave signs of tamper evidence.

Some peelable liners have tabs that facilitate removing the liner. Moreover, there are liners that do the work of resealing. Another name for these liners is “two piece liners.” How do they work? The foil liner forms a mechanical bond with a pulp board backing unit that stays in the cap after it’s removed.

For sealing some products having chemicals and oils, a barrier layer may also be used. Thus later protects the foil liner.

Which type of Cap?

What caps are usable in the Induction sealing procedure? Almost all caps that can put sufficient downward force on the liner to the container’s land area. The capacity of a cap being induction sealed depends on its geometry, the liner size, and more factors. In CT caps and CRC caps, usually, a minimal distance separates the liner from the apex of the cap. The exception to this rule is Dispensing Caps like yorkers, discs, and flip tops. In these caps, a larger distance separates the induction liner from the apex of the cap. Uniquely designed sealing heads may be required for these caps.

Choosing the right sealing design head

The sealing head of every Induction Sealer isn’t made equal. A range of sealing heads are available for the optimal induction field for diverse applications. These include flat, tunnel, custom, and deep tunnel heads.

Finding the right cap sealing operating window

What is “cap sealing operating window?” It is the range from the least to the maximum power levels for achieving an excellent seal. After ascertaining an operating window, a power level within the range is to be selected for production. The power level should be based on the peelability and seal strength that the product requires.

The first step towards ascertaining the window is to reseal the first container at half power. See the result and adjust the power slightly. Keep decreasing the power slightly and see is a proper seal is made. In this way, find the least power to achieve a proper seal.

Next is sealing the first container at this least power. Now, keep increasing the power by small amounts. In this way, ascertain the maximum power to achieve a proper seal.

It is essential to ensure that the conveyor speed is stipulated to the tangible production rate.


Cap sealing machines are needed for high volume manufacture and laboratory cap sealing. Whatever the need, Sigma CapSeal is an excellent choice. The company has a cap sealing equipment for all needs. The company’s cap sealing machines are made to ensure field performance. The company experts offer advice on the right cap sealer to ensure the ideal cap seal.

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