What electromagnetic inductive aluminium foil seal liner can do?
Electromagnetic inductive aluminum foil seal can be divided into one piece and two piece type. Electromagnetic inductive sealing liner is a non-contact heating process, it will be composite aluminum foil sheet bonded to the container, this unique sealing process can be used in a variety of materials of the container to seal the contents, so that the container opening is sealed, moisture and oxygen resistance, to ensure the product shelf life. The surface of the hot sheet can be designated for printing, trademark and drawings according to the customer.
- One-piece aluminium foil sealer: After the magnetic induction is heat-sealed, the composite aluminium foil layer forms a seal on the bottle mouth, leaving no paperboardin the bottle cover.
- Two-piece aluminium foil sealing liner: After the magnetic sensor is heat-sealed, the composite aluminum foil layer is separated into an aluminum foil sealing layer to seal the bottle mouth, and another piece of cushion layer (paper board or foam) is left in the cover to enhance the sealing effect of the lid and the bottle mouth after the aluminum foil is torn off.
The surface of the aluminum foil sheet is generally covered with two kinds of films, one is PE film and the other is PET film.
- PE film coated with aluminum foil gasket
PE film is a film of aluminum foil gasket sealing layer, which has greater air permeability, and with the increase of density, its air permeability decreases. PE film is odorless, non-toxic, feels like wax, has excellent low temperature resistance (the minimum use temperature can reach -70~-100 °C), good chemical stability, can resist the erosion of most acids and alkalis (not resistant to acids with oxidizing properties), insoluble in general solvents at room temperature, small water absorption, but because it is a linear molecule, it can be slowly dissolved in some organic solvents, and does not swell, and has excellent electrical insulation performance.
- PET film, which is commonly used in the introduction of aluminum foil gaskets
PET film is a packaging film with comprehensive performance. Its transparency is good and shiny; It has good air tightness and fragrance retention; Medium moisture resistance, and decreased moisture permeability at low temperatures. PET film has excellent mechanical properties, its strength and toughness are the best among all thermoplastics, and the tensile strength and impact strength are much higher than that of general films; And it has good stiffness, stable size, and is suitable for secondary processing such as printing and paper bags. PET film also has excellent heat and cold resistance, as well as good chemical and oil resistance.
Scope of application of aluminium foil seal: applicable to PE, PP, PS, ABS, PET and glass bottles and other materials of container sealing, can be widely used in medicine, food, chemicals, oil and other industries. Can be pressed into glass, metal or plastic bottles (aluminum-free, bonded to the bottle finish) and is recommended for use in the packaging of solid or dry food or pharmaceutical products Usually used in conjunction with foam sheets to increase the sealing effect.
