aluminum foil-2017 the best aluminum foil manufactures in China

Aluminium foil profile

Aluminium foil （or aluminum foil）， often referred to with the misnomer tin foil， is aluminium prepared in thin metal leaves with a thickness less than 0.2 mm （7.9 mils）; thinner gauges down to 6 micrometres （0.24 mils） are also commonly used. In the United States， foils are commonly gauged in thousandths of an inch or mils. Standard household foil is typically 0.016 mm （0.63 mils） thick， and heavy duty household foil is typically 0.024 mm （0.94 mils）。 The foil is pliable， and can be readily bent or wrapped around objects. Thin foils are fragile and are sometimes laminated to other materials such as plastics or paper to make them more useful. Aluminium foil supplanted tin foil in the mid 20th century.

　　Annual production of aluminium foil was approximately 800，000 tonnes （880，000 tons） in Europe and 600，000 tonnes （660，000 tons） in the U.S. in 2003. Approximately 75% of aluminium foil is used for packaging of foods， cosmetics， and chemical products， and 25% used for industrial applications （e.g. thermal insulation， cables and electronics）。 It can be recycled.

　　In North America， aluminium foil is known as aluminum foil. It was popularised by Reynolds Metals， the leading manufacturer in North America. In the United Kingdom and United States it is， informally， widely called tin foil， for historical reasons （similar to how aluminium cans are often still called “tin cans”）。 Metallised films are sometimes mistaken for aluminium foil， but are actually polymer films coated with a thin layer of aluminium. In Australia， aluminium foil is widely called alfoil.

Aluminium foil Manufacture

Aluminium foil is produced by rolling sheet ingots cast from molten billet aluminium, then re-rolling on sheet and foil rolling mills to the desired thickness, or by continuously casting and cold rolling. To maintain a constant thickness in aluminium foil production, beta radiation is passed through the foil to a sensor on the other side. If the intensity becomes too high, then the rollers adjust, increasing the thickness. If the intensities become too low and the foil has become too thick, the rollers apply more pressure, causing the foil to be made thinner.

The continuous casting method is much less energy intensive and has become the preferred process. For thicknesses below 0.025 mm (1 mil), two layers are usually put together for the final pass and afterwards separated which produces foil with one bright side and one matte side. The two sides in contact with each other are matte and the exterior sides become bright; this is done to reduce tearing, increase production rates, control thickness, and get around the need for a smaller diameter roller.

Some lubrication is needed during the rolling stages; otherwise, the foil surface can become marked with a herringbone pattern. These lubricants are sprayed on the foil surface before passing through the mill rolls. Kerosene based lubricants are commonly used, although oils approved for food contact must be used for foil intended for food packaging.

Aluminium becomes work hardened during the cold rolling process and is annealed for most purposes. The rolls of foil are heated until the degree of softness is reached, which may be up to 340 °C (644 °F) for 12 hours. During this heating, the lubricating oils are burned off, leaving a dry surface. Lubricant oils may not be completely burnt off for hard temper rolls, which can make subsequent coating or printing more difficult.

The rolls of aluminium foil are then slit on slitter rewinding machines into smaller rolls. Roll slitting and rewinding is an essential part of the finishing process.

Henan huawei alumium CO., LTD is a China-based manufacturer and supplier of aluminum foil. In order to better serve our customers, we also provide aluminium slit coil, embossed aluminum sheet, aluminum coil, 5 bar aluminum tread plate, aluminum coil, aluminum strip, and more. If you have a need for any of our products, we welcome you to contact us. We sincerely hope to cooperate with you! 

 Aluminium foil Uses 

aluminum foil for Cooking

Aluminium foil is also used for barbecuing more delicate foods， such as mushrooms and vegetables. Using this method， sometimes called a hobo pack， food is wrapped in foil， then placed on the grill， preventing loss of moisture that may result in a less appealing texture.
　　As is the case with all metallic items， aluminium foil reacts to being placed in a microwave oven. This is because of the electromagnetic fields of the microwaves inducing electric currents in the foil and high potentials at the sharp points of the foil sheet; if the potential is sufficiently high， it will cause electric arcing to areas with lower potential， even to the air surrounding the sheet. Modern microwave ovens have been designed to prevent damage to the cavity magnetron tube from microwave energy reflection， and aluminium packages designed for microwave heating are available.

aluminum foil for Packaging

Aluminium is used for packaging as it is highly malleable： it can be easily converted to thin sheets and folded， rolled or packed. Aluminium foil acts as a total barrier to light and oxygen （which cause fats to oxidise or become rancid）， odours and flavours， moistness， and germs， and so it is used broadly in food and pharmaceutical packaging， including long-life packs （aseptic packaging） for drinks and dairy goods， which allows storing without refrigeration. Aluminium foil containers and trays are used to bake pies and to pack takeaway meals， ready snacks and long life pet foods.
　　Aluminium foil is widely sold into the consumer market， often in rolls of 500 mm （20 in） width and several metres in length. It is used for wrapping food in order to preserve it， for example， when storing leftover food in a refrigerator （where it serves the additional purpose of preventing odour exchange）， when taking sandwiches on a journey， or when selling some kinds of take-away or fast food. Tex-Mex restaurants in the United States， for example， typically provide take-away burritos wrapped in aluminium foil.　　

aluminum foil for Art and decoration

Heavier foils made of aluminium are used for art， decoration， and crafts， especially in bright metallic colours. Metallic aluminium， normally silvery in colour， can be made to take on other colours through anodisation. Anodising creates an oxide layer on the aluminium surface that can accept coloured dyes or metallic salts， depending on the process used. In this way， aluminium is used to create an inexpensive gold foil that actually contains no gold， and many other bright metallic colours. These foils are sometimes used in distinctive packaging.

aluminum foil for Geochemical sampling

Foil is used by organic/petroleum geochemists for protecting rock samples taken from the fields and in the labs where the sample is subject to biomarker analysis. While plastic or cloth bags are normally used for a geological sampling exercise， cloth bags are permeable and may allow organic solvents or oils （such as oils imparted from the skin） to taint the sample， and traces of the plastics from plastic bags may also taint the sample. Foil provides a seal to the ingress of organic solvents and does not taint the sample. Foil is also used extensively in geochemical laboratories to provide a barrier for the geochemist， and for sample storage.

 Henan huawei alumium CO., LTD is a China-based manufacturer and supplier of aluminum foil. We sincerely hope to cooperate with you!