packaging foil

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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, it is used broadly in food and pharmaceutical packaging. The purpose of aluminium is to make long-life packs (aseptic processing|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.

Aluminium foils thicker than 25 µm (1 mil) are impermeable to oxygen and water. Foils thinner than this become slightly permeable due to minute pinholes caused by the production process.

Aluminium foil has a shiny side and a matte side. The shiny side is produced when the aluminium is rolled during the final pass. It is difficult to produce rollers with a gap fine enough to cope with the foil gauge, therefore, for the final pass, two sheets are rolled at the same time, doubling the thickness of the gauge at entry to the rollers. When the sheets are later separated, the inside surface is dull, and the outside surface is shiny. This difference in the finish has led to the perception that favouring a side has an effect when cooking. While many believe that the different properties keep heat out when wrapped with the shiny finish facing out, and keep heat in with the shiny finish facing inwards, the actual difference is imperceptible without instrumentation.The reflectivity of bright aluminium foil is 88% while dull embossed foil is about 80%.


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Q:What's the difference between aluminum laminated films and aluminum foil film?
Aluminum laminated film is thin film like PP and PET steamed by vacuum and then coated with aluminum. Aluminum foil film is a film that is compounded by aluminum foil and plastic film. The alumimum coated layer is very thin with the thickness of 300-400 angstrom while the thickness of aluminum foil is about 0.01mm.
Q:How does aluminum foil tube specifications can be classified?
It's my pleasure to answer your queations. It can be divided into food grade pu and texture silica gel material. Specification of pu steel wire hose: Stainless steel hose manufacturer to reduce production costs and enhance the competitiveness of the hose, they usually use 212 rolled steel to replace 304 stainless steel to process production. Due to the quality of stainless steel pipe's heavy quality, not easy to bend, easy to produce retention, it is not easy to use. So that lighter pu texture that can meet the requirements of food grade is more favored by the customers. Pu texture food grade tube adopts food grade PU texture and high temperature extrusion process, taking stainless steel wire as skeleton. Hose is light, flexible and smooth inside and outside, which can prevent microbes from breeding. The diameter of hose varies from 25 mm to 100 mm, fully meeting the needs of various industries. It can be widely used in food processing, beverage, drinks, fruit juices, edible oil, spices and other industries.
Q:What color coated aluminum coil is?
Color coated aluminum coil refers to the surface of an aluminum coloring process, color coated aluminum coil has become one of the most popular decorative material top. It is a kind of green environmental protection, durability and aesthetic characteristics.
Q:What's the difference between PET gold card paper and aluminum foil gold card paper film?
Aluminum foil gold card paper is used in base materail(paperboard) 1:It is easy to compare the appearance when you know the making process. Aluminum foil is made by pressing vaporized aluminum into slice and then print or thermoprint. Stick to PET thin film and shake it under ray of light. You will find that it is highly reflective. 2: Burning test: PET belongs to transparent plastic. PET gold card paper and aluminum foil have different appearence and making process. 3.PET gold card paper is printed on base materail(paperboard) previously,however, some printing layer don't have good reflective performance. PET thin film is very bright. When aluminum foil gold card paper burn to a cinder, the remained metal aluminum foil is thermoprinted. PET gold card paper can be burned into cinder totally. Aluminum foil is with metallic lustre.
Q:What's the specific gravity of aluminum foil?
The specific gravity of aluminum foil is in the same with that of aluminum ingot, which is 2.7t/m^3 and slightly different according to different aluminum foil material.
Q:Is aluminum foil pure aluminum?
Not really, aluminum foil can be devided into pure aluminum foil and aluminum alloy foil.
Q:What is carbon coated aluminum foil?
Original aluminum conductive properties of the metal itself is already good, but for the greater enhance its conductivity, people invented a carbon-coated aluminum foil. Carbon-coated aluminum foil is referring to the conductive graphite and carbon nano-coated tablets, uniform, delicate coated on aluminum foil, aluminum foil once put on such "nano coat", it will be able to collect micro-current of the active substance and greatly reduce negative resistance between the poles, the static conductivity to maximize the performance.
Q:What's the important characteristic and the advantages of aluminum food package bag
The use of aluminum foil should be intergrated with the plastic foil and the aluminum foil in food industry are all in a high grade package.
Q:The dark face of 8021 aluminum foil appears uneven rolling. What causes this and how to solve it?
Seeing clearly the uneven rolling in the dark face.
Q:Does Aluminum foil glass fabric air duct need thermal insulation?
Phenolic-aluminum foil compound air conduct itself has good thermal insulation, due to the phenolic foam in between. It is a little expensive than galvanized steel sheet, but the latter one needs extra insulation. Not necessary. It has in-built insulation, light and easy to install. It is expensive than the galvanized steel air duct, but the latter usually needs the cost of thermal insulation material and labor. By the way, Phenolic-aluminum foil compound air conduct produces dust after using a period of time usually five years.

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