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:Aluminium daily maintenance need to pay attention to what matters?
1.aluminum during storage, is strictly prohibited and chemical materials and wet materials are stored together 2.aluminum during transport, must be covered with a tarpaulin to prevent rain, snow intrusion;
Q:What are the advantages and disadvantages of aluminum foil packaging?
Excellent barrier properties , moisture-proof, airtight, Paul Hong, the contents of the package to prevent moisture absorption, oxidation and volatilization deterioration of its moisture barrier, oxygen barrier properties. Easy processing of aluminum foil, plastic film and paper can be complexed with.
Q:Why the aluminum foil should have anneal craft
The metal hardness processing is making the hardness higher and the ductility worse. it needs to revert to the anneal to press the aluminum.The process needs to have anneal several times.
Q:What's the highest temperature the aluminum foil and tin foil can resist?
Tin foil paper can resist high temperature. Aluminum foil paper or aluminum foil which is also called tin foil paper in Hong Kong, is a kind of thin sheet of less than 0.2mm in thickness processed by aluminum foil roller. It is mainly used to cook and contain food, or make some kinds of material for cleaning. Tens of and thousands of aluminum foil papers are used to preserve and package food, cosmetic products and chemical products. The applications of tin foil paper are as follows: 1. Prevent food from sticking baking tray; 2. Prevent food from sticking dirty stuff; 3. Convenient to clean baking tray; 4. Package the seasoning and stuffing to prevent them from falling into pieces when baking food; 5. Preserve water and keeping fresh.
Q:What ‘s the thickness of a piece of aluminum substrate copper foil?
Aluminum substrate copper foil is negative electrode materials, a series of thin tinsel deposited at the base of the circuit board as an electric conductor. It easily bonds with the insulating layer under the protection of printing layer, turning into circuit patterns.
Q:Is aluminum foil pure aluminum?
Yes.
Q:What's the important characteristic and the advantages of aluminum food package bag
The aluminum food package has the advantages of withstanding high temperature,puncture-resistant,deformation.The package materials of aluminum are made of PE/AL/PE/CPP. The PE is effective in painting.
Q:Adhesion of aluminum and glass
Firstly, clean them up and then use bi-component polyurethane structural adhesive to spice them. Make the appearance of fiberglass polished and clean.The appearance of aluminum foil would better be anodized to make it have good tenacity and strength.
Q:What's the aluminum foil tape in hydropower decorating material?
It's the thermal insulation material mninly used to twine pipelines like water pipe and smoke vent.
Q:Is the environmental friendly aluminium foil box poisonous
The product heavy is light, and the product is qualified for the National food hygiene standards.it is convenient for recycle and no harmful substance is produced when processing and no pollution.the aluminium food box is widely used in the flight food and cake with the charateristic of quick upgrade and large consumption.it is suitable for large sale.

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