Things You Should Know about Aluminium Foil

Aluminum foil is produced by rolling slabs of molten aluminum billet casting and then re-rolling them to the desired thickness on a sheet and foil mill, or by continuous casting and cold rolling. In order to maintain a constant thickness in foil production, the beta radiation reaches the sensor on the other side through the foil. If the intensity becomes too high, the rollers are adjusted so that the thickness is increased. If the strength becomes too low and the foil becomes too thick, the rollers exert more pressure, causing the foil to become thinner. Next, the aluminum foil supplier will share the following content with you.

The continuous casting method is much less energy-intensive and has become the preferred process. For thicknesses below 0.025 mm (1 mil), the two layers are usually put together for a final pass and then separated, resulting in a foil with one bright side and one non-glossy side. The sides that touch each other are matte and the outer side becomes bright; this is done to reduce tearing, increase productivity, control thickness and avoid the need for smaller diameter rolls.

 Aluminium Foil

Some lubrication is required during the rolling stage; otherwise, the foil surface may carry a herringbone pattern. These lubricants are sprayed on the foil surface prior to passing through the rolls. Kerosene-based lubricants are commonly used, although oils approved for food contact must be used for food packaging foils.

Aluminum is process-hardened and in most cases annealed during the cold rolling process. The foil roll is heated until it reaches softness, which can be up to 340 °C (644 °F) for 12 hours. During the heating process, the lubricant is burned off, leaving a dry surface. With hard tempered rolls, the lubricant may not burn off completely, which can make subsequent coating or printing more difficult.

The foil rolls are then cut into smaller rolls on a slitter rewinder. Roll slitting and rewinding is an important part of the finishing process.

Aluminum is used in packaging because it is highly ductile: it can be easily converted into sheets and folded, rolled, or wrapped. Aluminum foil completely blocks light and oxygen (causing oxidation or decay of fats), odors and tastes, moisture, and bacteria, so it is widely used in food and pharmaceutical packaging, including long-life packaging (aseptic packaging) packaging) for beverages and dairy products that can be stored without refrigeration. Aluminum foil containers and trays are used for baking pies and packaging take-out foods, ready-to-eat snacks, and pet foods with a long shelf life.

Aluminum foil is widely sold to the consumer market, usually in rolls 500 mm (20 inches) wide and several meters long. [11] It is used to package food to preserve it, for example, to store leftovers in the refrigerator (for the additional purpose of preventing odor exchange), to carry sandwiches on the go, when baking, or to sell some take-out or fast food. For example, Tex-Mex restaurants in the United States usually offer take-out tacos wrapped in aluminum foil.

Industry uses of aluminium in packaging

Rigid containers made from sheets, foil laminates or drawn heavy foil, or extruded from blocks

Bottles and wide-mouth caps made from sheet or aluminium foil

Collapsible tubes, made from poppers by impact extrusion

Flexible packaging

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