Induction Sealing Machine Suppliers & Manufacturers

How induction sealing works and which containers it suits

Induction sealing creates a hermetic foil seal on the opening of a bottle or jar using electromagnetic induction heating — without direct heat contact. The process: a cap with an inner foil-laminate liner is applied to the filled container and torqued in the normal capping process. The capped container then passes under or through an induction sealing head, which generates a high-frequency electromagnetic field. The field induces eddy currents in the aluminium foil layer of the liner, heating it rapidly. The heat melts a thin layer of polymer wax on the underside of the foil, bonding it to the container neck opening. The result is a hermetic foil seal bonded to the container, providing tamper evidence, freshness seal, and leak protection. Induction sealing is compatible with a range of container materials and is widely used on: PET bottles (cooking oil, juice, sport drinks, pharmaceuticals, supplements); HDPE bottles (chemicals, detergents, lubricants, supplements); PP jars and bottles (food products, cosmetics, chemicals); glass bottles (sauces, oils, beverages) where the neck finish has been designed for induction sealing; aluminium bottles. Induction sealing requires a cap with an induction-sealing-compatible liner. Standard caps without a foil liner will not seal. Foil liners are available in various specifications — single-piece liners (wax/foil/backing) produce a peel-back foil; two-piece liners (foil bonds to container, backing remains in cap) leave the foil on the container when the cap is removed.