Induction sealing uses foil coatings and heat to create a hermetically sealed container without physical contact. It is used for a wide range of products, including pharmaceuticals and food. The process was developed in the 1950s to prevent liquid leaks and has since been used for longer food storage and tamper-evident seals. The materials used can leave residue or none at all, depending on the product. Induction sealing has advantages over other sealing processes as it requires no physical contact, allowing for faster processing and working with various container sizes.
Induction sealing is a process that can create a hermetically sealed container without any physical contact, typically involving coatings composed of foil and other materials. The coating is placed on top of a container and then heated via induction. As it heats, the wax or other sealing substance heats up and sets it tightly to the container. Since induction sealing is a process that does not require direct contact, a lid can be placed on the foil coating prior to the sealing process. This procedure is used to seal all a wide range of products, including pharmaceuticals, food products, motor oil and others.
In the late 1950s, the concept of induction sealing was developed to solve the problem of liquids leaking from sealed containers. The first induction sealers used vacuum tube technology, although solid-state devices were soon introduced. Large units are capable of automatically processing containers using conveyor belts, although induction sealing can also be done with small handheld devices.
Many of the early uses of induction sealing were to prevent liquids from leaking out of containers during transit. Later uses extend to storing fresh foods for longer periods of time, due to the hermetically sealed nature of the containers. A series of events has led to the creation of tamper evident seals for medicines. One of the favorite methods of creating these containers is induction sealing.
The materials used to create the aluminum liners can be designed to leave a visible residue on the container. If this residue is present when a consumer buys a medicine, it is immediately apparent that the product has been tampered with. Other foil liners are designed to leave no residue, which is typically more desirable when packaging food products. If a large amount of residue is left, it could contaminate the food or interfere with its use.
One of the main advantages of induction sealing is that no contact between the heating apparatus and the bottle is required. This can allow an induction sealer to work with a variety of container sizes and can also speed up the process. Since no physical contact is required, the container can have the coating applied, a lid placed on top, and then run under an induction sealer all on the same conveyor assembly line. With processes such as conductive sealing, physical contact between a metal plate and the coating is required, which can slow processing.
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