Itasca, Ill. — Attendees at the Plastics Caps & Closures Conference heard all about tamper-evident packaging like caps that click when opened. But one speaker heralded the humble induction seal — that thin barrier you have to remove to get to the product.
Induction seals are used on food and beverage, cosmetics, personal care, household chemicals are many more products, said John Brown, vice president of marketing at Selig Group, based in Naperville, Ill.
They provide leak protection and tamper evidence.
Brown gave a 101 of induction sealing: The liners can have a variety of constructions, but a common one is laminating together resins, paper, film, foam and foil.
Selig makes rolls of the seals, then cuts them down to tape. Closure manufacturers punch out discs and insert them into the closures.
When the product is filled and the cap screwed on, and the package goes through induction heating equipment. The induction liner adheres to the container.