How Do Induction Cap Sealers Work?

Induction Cap Sealers / Foil Lid Sealing MachinesWe recently added a couple new induction cap sealers to our site (found here). While I was familiar with what they did, I didn’t really understand how the technology worked. These sealers are the machines that place the protective foil seal to the top of bottles. This includes such products as food, cosmetics and much more. After having thoroughly researched this, I would like to share with you exactly how these machines work.

Induction cap sealers are used with just about every consumable product you use. These sealers produce a tamper proof seal that helps preserve freshness, prevent leaks, provide tamper evidence, helps with pilferage protection and extend shelf life. You may have seen a sign on the top of these seals that says something to the effect, “Do not use if seal is broken”. The technology used to apply these seals is remarkably clever and efficient.

Induction Foil Bottle SealThe seal they apply to the opening of a glass or plastic container is usually made out of a foil barrier, although other materials can be used. The foil consists of a few layers of laminated products and uses a sealing resin or a polymer to produce the seal. This results in a very sturdy and durable seal that won’t break or fall off.

It’s amazing how much these seals are used in products we handle every day. Just this week I changed the oil on my car and the quart bottles each had a foil seal. The yogurt I ate this morning had a foil seal. I even opened up a new bottle of ketchup this week and it too had an induction sealed foil cap.

So how does this technology work? It is remarkably simple and there are no moving parts during any part of the sealing process. The first step involved is to insert a seal into the lid of the product being sealed. This can be manually done or automatic, depending on the packaging system being used. Once the lid is screwed on (manually or automatic), the bottle is run under an induction sealer.

The induction sealer uses electrical current run through induction coils to produce a strong electromagnetic field. This field causes the foil to heat up, which in turn causes the membrane (using sealing resin or polymer) to seal to the top of the bottle. The process is extremely fast, usually only taking a few seconds. Because an electrometric is used, you should only use this type of sealing process with plastic or glass containers. Do not use this with metal containers.

Example of Induction Foil Cap Seal on BottleInduction cap sealers range in size from tabletop units to full blown automatic production-level machines. At ABC Office we offer semi-automated. We currently offer two models, but expect this to increase. Here are the two models currently offered on our site:

  • AF-500W Induction Cap Sealer (found here) – This particular model is designed to be used with containers that have a diameter opening ranging from 15mm up to 120mm. The height of the sealer can be adjusted to accommodate the bottle being sealed. Simply place your bottle on the platform, press the foot pedal and in just a few seconds the process is complete.
  • CS-501 Induction Cap Sealer (found here) – This induction sealer is very similar to the AF-500W, but is more robust. Instead of a 500-watt power supply, this one has an 1100 watt power supply. It also includes the addition of a cap sealer, which will automatically screw on the cap and inductively seal the membrane to the container’s opening.

Our induction bottle cap sealers are designed to seal the foil membrane without any scorching and zero leaks. They can even apply a seal to the lid of small amounts of liquid or powder are on the rim of the bottle. These sealers are tough, designed to be used on a daily basis. They also have a small footprint and don’t require any special training to use.

If you still have questions about induction cap sealers, please don’t hesitate to give us a call at 1-800-658-8788. We would love to help you out.

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