Technology and Events

Induction sealing Frequently Asked Questions (FAQ)

The most frequently asked questions about induction sealing.

  • What can induction seals be applied to?

  • An induction seal can be applied to:

    • Liquid products, such as beverages or motor oil.
    • Hot or room temperature products or chilled foods.
    • Dried foods such as coffee, herbs and powdered foods.


  • Can my product be induction sealed?

  • 99% of products can be induction sealed in glass and plastic containers. We currently work with companies from the following industries:

    • Pharmaceuticals.
    • Cosmetics.
    • Agrochemicals.
    • Food and drink.
    • Chemicals.


  • What are the dimensions of a container that could be induction sealed?

  • Induction sealing can take place for any size up to a 140-mm cap diameter, taking into account that a smaller diameter will produce a higher sealing quality.

  • Glass – Can I seal glass containers?

  • Yes, it’s possible to seal glass containers. In any case, the majority of glass containers are treated when produced, so it’s essential to ask for the right type of aluminium foil given that the aluminium polymer must correspond to the treatment agent used for the glass. To seal these types of containers, we recommend our INDUFLEX UNIVERSAL monoseal or our two-layer INDUCSEAL UNIVERSAL.

  • PET – Can I seal polyethylene terephthalate containers?

  • Yes, it’s very easy to seal PET containers but you must also be sure to use the correct type of aluminium foil. Your induction liner supplier should advise you on this matter, but if you’re not sure, our experts are here to help you.

  • What does the speed of sealing depend on?

  • In principle, there are several parameters that we need to use when adjusting the speed of sealing. These include taking into account the diameter of the sealing disc, the type of cap, the speed of the conveyor, the size of the power generator and the induction coil.

  • Does a greater power value in kilowatts (kW) increase the performance of an induction cap sealer?

  • No, a higher power value in kilowatts (kW) does not necessarily improve the performance of an induction cap sealer. Although a higher power value in kilowatts does indeed mean that the system is more powerful, this does not always entail an improvement in the sealing rate. The most important aspect for the functioning is how the energy is transferred from one part of the system to the other.

  • What might have happened if I open the container and the seal has not been created?

  • This can happen for several reasons, the main ones being that there is no contact between the neck of the container and the induction sealing disc due to a height problem, and in this case, the sealing was not achieved. It may also happen that the induction machine parameters have not been adjusted and the aluminium does not get hot enough to get the seal.

  • What could happen if I don’t adjust the induction machine parameters well?

  • It’s very important to adjust the induction machine parameters well since this may be the most important aspect to get a quality seal. The power, induction time and temperatures are the main aspects, although there is also the distance to the induction plate of the speed of the line. The more speed, the more power and higher temperature there must be, and vice versa. For this reason, it’s advisable to do tests on the same machine and every time a different container is used, since if the necessary power is not reached, the sealing will not occur and if we set a higher power, the aluminium foil might get burned with the consequent problem for the packaged product.

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