fólií
Fólií, or foil, refers to a thin sheet of material, typically metal, but also plastic or composite, used to wrap, shield, or insulate objects. Foils are chosen for their thinness, pliability, and barrier properties.
Metal foils include aluminium, copper, tin, and gold. The most common household foil is aluminium. Plastic foils
Production methods include rolling for metal foils, cold rolling to reach thinness, followed by annealing to
Applications are broad. In packaging, foils protect foods against moisture, gases, and light. In insulation, foil-faced
Historically, tin foil was used in the 18th and 19th centuries for wrapping, but modern packaging relies