Foil package for aluminum

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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%.


Aluminium (or aluminum; see spelling differences) is a chemical element in the boron group with symbol Al and atomic number 13. It is a silvery white, soft, ductile metal. Aluminium is the third most abundant element (after oxygen and silicon), and the most abundant metal in the Earth's crust. It makes up about 8% by weight of the Earth's solid surface. Aluminium metal is so chemically reactive that native specimens are rare and limited to extreme reducing environments. Instead, it is found combined in over 270 different minerals.The chief ore of aluminium is bauxite.

Aluminium is remarkable for the metal's low density and for its ability to resist corrosion due to the phenomenon of passivation. Structural components made from aluminium and its alloys are vital to the aerospace industry and are important in other areas of transportation and structural materials. The most useful compounds of aluminium, at least on a weight basis, are the oxides and sulfates.

Despite its prevalence in the environment, no known form of life uses aluminium salts metabolically. In keeping with its pervasiveness, aluminium is well tolerated by plants and animals. Owing to their prevalence, potential beneficial (or otherwise) biological roles of aluminium compounds are of continuing interest.


Aluminium alloys with a wide range of properties are used in engineering structures. Alloy systems are classified by a number system (ANSI) or by names indicating their main alloying constituents (DIN and ISO).

The strength and durability of aluminium alloys vary widely, not only as a result of the components of the specific alloy, but also as a result of heat treatments and manufacturing processes. A lack of knowledge of these aspects has from time to time led to improperly designed structures and gained aluminium a bad reputation.

One important structural limitation of aluminium alloys is their fatigue strength. Unlike steels, aluminium alloys have no well-defined fatigue limit, meaning that fatigue failure eventually occurs, under even very small cyclic loadings. This implies that engineers must assess these loads and design for a fixed life rather than an infinite life.

Another important property of aluminium alloys is their sensitivity to heat. Workshop procedures involving heating are complicated by the fact that aluminium, unlike steel, melts without first glowing red. Forming operations where a blow torch is used therefore require some expertise, since no visual signs reveal how close the material is to melting. Aluminium alloys, like all structural alloys, also are subject to internal stresses following heating operations such as welding and casting. The problem with aluminium alloys in this regard is their low melting point, which make them more susceptible to distortions from thermally induced stress relief. Controlled stress relief can be done during manufacturing by heat-treating the parts in an oven, followed by gradual cooling—in effect annealing the stresses.

The low melting point of aluminium alloys has not precluded their use in rocketry; even for use in constructing combustion chambers where gases can reach 3500 K. The Agena upper stage engine used a regeneratively cooled aluminium design for some parts of the nozzle, including the thermally critical throat region.

Another alloy of some value is aluminium bronze (Cu-Al alloy).


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Q:What's the difference between PTP aluminum foil and conventional soft packing used aluminum foil?
PTP aluminum foil can't resist high temperature while conventional soft packing used aluminum foil does.
Q:Why chocolate is packaged by aluminum foil?
Although chocolate is not easy to corrupt, but when the temperature to 20 degrees Celsius, which is a component of cocoa butter will melt and begin to separate, frozen again will condense a white cream substance on the surface, it affects the flavor. So chocolate is generally used aluminum foil wrap is good, usually on the freezer to save. Secondly, he has the role of moisture, maximum relative humidity of 65%.
Q:Between Aluminum foil fibre cloth tape and pure aluminum foil tape which one is good?
It only depends on what fields do you want to use it? If it is used in explosion-proof, strapping, it is suggested that you can use fiber cloth aluminum foil tape. If considering heat conduction, electric conduction and shielding performance, it is suggested that you use the pure aluminum foil tape.
Q:What is the principle of insulation of aluminum foil tape?
Foil is actually outside temperature conduction, the temperature inside to protect from outside influence, in fact, cotton insulation is insulation. There are thermal insulation, waterproof, moisture and other functions. Its solar radiation absorption coefficient is very low, most of the heat transfer can be separated.
Q:Is aluminum foil pure aluminum?
Not really, aluminum foil can be devided into pure aluminum foil and aluminum alloy foil.
Q:How to remove words on aluminium foil used in medicine package? Is there any easy way?
Words printed on it is organic matter and can be corroded by concentrated sulfuric acid. Since aluminium plate is protected by oxidation film in its appearance, it's ok to do so. But you should be careful when you operate for plastic plate may also be corroded. Only teflon and high density polyethylene are anti-corrosion, but they are with higher price and therefore won't be used in normal situation.
Q:Does Aluminum foil glass fabric air duct need thermal insulation?
Sox duct features large air flow and evenly blowing-in; Anti condensation; It is easy to maintain and environmentally friendly; It is light and easy to install; It is highly cost effective. Recently it has been used in a wide range of fields, especially the supermarket industry that develop rapidly.
Q:The classification of aluminum foil
Q:What is the principle of thermal insulated aluminum tape?
The principle of thermal insulated aluminum tape is to process various metals like aluminum, gold, copper and silver into multi-layer densely and highly thermal-insulated metal film by utilizing vacuum metallization and magnetron sputtering. When the outer-shell electron (free electron) in the metal material which is generally not bound by atomic nucleus is exposed to light waves, the electric field allows it to absorb the light energy and thus produces vibration at the same frequency as light. Then the vibration produces the light at the same frequency as the original light, which is known as the reflection of light. The higher perveance of metal, the lower degree of penetration and the higher reflection. The metal layers will reflect back the heat source in the sun including infrared ray, ultraviolet ray and visible light selectionally and then re-release after the colors of metal film absorb the solar radiation and finally part of heat can be removed as the outdoor air flows, thus effectively insulating the heat.
Q:How to use aluminum tape?
Taking aluminum foil as the base material and then coated with acrylic adhesive, aluminum tape is featured by high peel strength, excellent adhesion and oxidation resistance, corrosion resistance and flame resistance. Aluminum foil can be classified as common aluminum tape, conductive aluminum tape, high peel strength aluminum tape, reinforced aluminum tape, clip marine welding aluminum tape, aluminum tape for heater, etc., so the effects are different. For example, the commonly used aluminum tape is mainly used for binding cold (hot) gas pipeline in cold (warm) gas engineering and water heater manufacturing. Conductive aluminum tape is commonly used for eliminating electromagnetic interference (EMI), isolating electromagnetic wave to human body and avoiding unnecessary voltage or current that may influence its function in all kinds of transformers, mobile phone, computer, PDA, PDP, LCD displays, notebook computers, copiers and other electronic products in which electromagnetic shielding is required. Conductive aluminum foil has several types, like double-sided conductive aluminum foil and single-sided conductive aluminum foil. Conductive aluminum foil is used for binding tinfoil, copper foil, aluminum foil and so on.

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