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:how to conserve aluminum?
We can conserve minerals in a number of ways. Industries can reduce waste by using more efficient mining and processing methods. In some cases, industries can substitute plentiful materials for scarce ones. Some mineral products can be recycled. Aluminum cans are commonly recycled. Although bauxite is plentiful, it can be expensive to refine. Recycling aluminum products does not require the large amounts of electric power needed to refine bauxite. Products made from many other minerals, such as nickel, chromium, lead, copper, and zinc, can also be recycled.
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:How about the capacity of aluminum foil?
The weight depends on the foil length, width, density, thickness, if there is a composite plastic film also need to know the plastic film density and the density of glue, composite materials are collectively known as the base (the basis weight), with the most direct method is the most simple weight then which can be the total weight of the length of the conversion using microbalance test grams per square meter of aluminum foil.
Q:how long do aluminum hulls last in saltwater?
as Mark points out COAST GUARD maintained boats will last a long time. What you have seems like a proverbial can of worms........stuff growing out 6 from the side? Shudder. What kills aluminum boats is galvanic corrosion, the tendency for every other metal any where near aluminum in salt water to eat it. I knew a famous aluminum ocean racer where people had to empty their pockets of loose change before going aboard, because stray pennies in the bilge would eat a hole thru the boat. No fairy tale. And if there is stray electrical current on or near the dock, the problem is ten fold. I would very very carefully scrape some growth off and hope you don't scape thru the plating. You very well might, so be prepared for an emergency haulout. You didn't mention how large the large boat is, but up to 45 feet or so, the plating probably wasn't much over 1/4 or 5/16th to start, so there's not a lot of room for galvanic action to make it literally paper thin. Depending on how much you are planning on sending, you should probably get a marine surveyor with an audio gauge...a portable Magic Thinghy that Measures Hull Thickness.....
Q:How high can aluminum foil be? Twenty
since it is the exhaust pipe, the temperature should not be too high, the founder will not exceed 100 degrees too much, the boiling point of water is only 100 degrees.
Q:Calculate the concentration of sulfate ions in a 0.905 M aluminum sulfate solution?
Aluminum sulfate combines Al3+ and SO4 2- So aluminum sulfate is Al2(SO4)3 (charge balance) So 0.905 M aluminum sulfate is 1.810 M in Al and ...
Q:Development prospect of aluminium foil
(four) cable foilCable foil is the use of aluminum foil sealing and shielding, single or double coated plastic film, an aluminum foil plastic composite #, used as a shield cable. The cable foil requires less oil on the surface and has no holes. It has high mechanical properties, but the overall quality requirements are not high, but the requirements of the length are very strict.Domestic advanced cold rolling mill, universal mill and aluminum foil roughing mill can be produced, but the market growth is poor, the domestic demand is about 25 thousand tons per year.
Q:Did you know aluminum in deodorant cause breast cancer?
This is only a theory, but I avoided the aluminum based ANTI-PERSPERANTS anyway. The deoderants usually don't have aluminum, so I bought the products that just said deoderant. I used to use a woman's product without aluminum, now I cannot find women's products that only have deoderant. Some other men's products that DO NOT have anti-persperants/aluminum, are Speed Stick by Mennan,(various scents). Interesting that there is a theory that aluminum in ant-ipersperants, may cause breast cancer, and all of the women's deoderants now have aluminum in them. Wonder why that happened? Some company could make a fortune if they started manufacturing women's deoderants without the anti-persperant containing aluminum.
Q:how to dry aluminium chloride?
Hi Nicola Paprika, Aluminum chloride is very deliquescent, and it can explode on contact with thewater under the effect of hydration. It ishydrolysis partially in the presence ofwater to form of hydrogen chloride (hydrochloric acid). In aqueous solution, AlCl3 is fully ionized , and the solution well led electric current. This solution is acidic. In a simplified way, the cation produced by the reaction of chloride of aluminium with water is written : [Al(H2O)6](3+) ======= [Al(OH)(H2O)5](2+) + H3O(+) AlCl3 is probably theLewis acid most commonly used and the most powerful. This compound has many applications in the chemicalindustry , including as a catalyst for the reactions of Friedel and Crafts, bothalkylation andacylation. It is also used for polymerization andisomerization of organic reactions. There is also an aluminium (I) chloride (AlCl3), but it is very unstable and is known in the gaseous State.
Q:Why is the cable of aluminum foil shielding or foil material not applicable to TV monitoring system?
Because of aluminum foil shielding or foil material, the real name is radio frequency cable, used for cable television or radar communications. The cables used for monitoring systems are called video cables.In the actual installation of the application, the market of SYWV (cable) in general, the shielding net in quality and technical requirements will be made relatively poor, shielding performance (anti-jamming) is relatively poor, if used for closed-circuit television monitoring for long wire transmission easier to introduce interference. The manufacturer knows, cable television transmission signal mainly depends on the modulation and demodulation device, the signal can be adjusted in a certain frequency band, can effectively avoid the interference signal, the signal source of CATV transmission is the satellite receiving station, is a very high in the room, midway is also equipped with a trunk amplifier, strong signal what; closed-circuit television monitoring? Its signal source is just a camera. So for SYWV video line cable TV for reasons of cost control reasons or technical requirements, will not be too focused on shielding performance or unnecessary on cable TV lines, will naturally take processing technology made of copper shielding net, a little thinning thinner or using non copper shielding net (such as copper and tin the old copper copper or other metal etc.).

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