Aluminum foil for electromagnetic shielding

The shielding effectiveness of aluminium foil depends upon the type of incident field (electric, magnetic, or plane wave), the thickness of the foil, and the frequency (which determines the skin depth). Shielding effectiveness is usually broken down into a reflection loss (the energy bounces off the shield rather than penetrates it) and an absorption loss (the energy is dissipated within the shield).

Aluminum foil for electromagnetic shielding:

Excellent High Frequency RF Shielding characteristics

Effective barrier against Low Frequency AC Electric Fields when grounded.

Electrically Conductive

Weather Resistant

Can be used as a Vapor Barrier – not breathable

Heavy Duty / Tear Proof

Flexible and light weight which allows for an easy installation

Safe to handle and non-toxic

Although aluminium is non-magnetic, it is a good conductor, so even a thin sheet reflects almost all of an incident electric wave. At frequencies more than 100 MHz, the transmitted electric field is attenuated by more than 80 decibels (dB) — however actual energy absorption is minimal: the remaining high-frequency rf energy is almost perfectly reflected from uniform flat aluminium surface, and thus, reflected signal may continue to propagate internally, and if holes or passages of suitable geometry exist in the shield, signal propagation may continue out through those, the aluminium being good material for implementation of a microwave-frequency waveguide.

Thin sheets of aluminium are not very effective at attenuating low-frequency magnetic fields. The shielding effectiveness is dependent upon the skin depth. A field travelling through one skin depth will lose about 63 per cent of its energy (it is attenuated to 1/e = 1/2.718… of its original energy). Thin shields also have internal reflections that reduce the shielding effectiveness.For effective shielding from a magnetic field, the shield should be several skin depths thick. Aluminium foil is about 1 mil (25 μm); a thickness of 10 mils (250 μm) offers less than 1 dB of shielding at 1 kHz, about 8 dB at 10 kHz, and about 25 dB at 100 kHz. At these frequencies a ferromagnetic material such as mild steel is much more effective, due to different and complementary electromagnetic permeability properties, and common practical shielding implementations utilise both an inner high-frequency reflective material such as aluminium, preferably bonded (via annealing or electroplating, done to avoid capacitance between separated layers), to a more substantial structural ferromagnetic shell, usually mild steel (in specialized applications, more expensive, less structurally useful and less workable materials may be preferred.) Despite the relative low mass density of aluminium, this design is usually both lighter and more effective than an equivalently absorptive design utilizing aluminium alone.

What is the properties of aluminum foil

What is aluminium foil

Aluminium foil is a very thin sheet of rolled aluminium supplied in its pure form (‘commercial purity’) or in a variety of alloys and tempers which give a wide choice of tensile properties.

The thickness of aluminum foil sheets ranges from the thinnest currently produced commercially at about 0.0065 mm (or 6.5 µm) to the defined upper limit of 0.2 mm (or 200 µm). Material thicker than 0.2 mm is defined as sheet or strip.

Aluminium foils thicker than 25 μm 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 (wrongly) 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. Increased reflectivity decreases both absorption and emission of radiation. Foil may have a non-stick coating on only one side. The reflectivity of bright aluminium foil is 88% while dull embossed foil is about 80%.

The attributes of aluminum foil art

• Abundance – aluminium is plentiful with no danger of world depletion.

• Barrier efficiency to light, gases, oils and fats, volatile compounds and water vapour

• Temperature resistance from deep-freeze to oven processing

• Heat conductivity and reflectivity

• Electrical conductivity

• Strength and durability

• Compatibility with foods and pharmaceuticals

• Ease of lamination and coating

• Flexibility

• Formability and non-returning dead-fold

• Decorative potential, brilliant or matt surface

• Printability by flexo, gravure and offset litho

• Non-toxicity

• Low weight

• Recyclability

• Corrosion resistance

• Cost-effectiveness – optimum performance yet resource economy

Surface finish

Corrosion Resistance

The naturally-occurring surface oxide on all aluminium in the presence of oxygen in the atmosphere acts as a shield and renders foil substantially corrosion resistant. Aluminium is also chemically resistant in contact with substances in the pH range 4 to 9.

Compatibility with food and chemicals

Non-reactive except to substances of high acidity or alkalinity (see Corrosion Resistance). Resistant to most common compounds in solution.

Formability

Dead fold

Non-absorbency

Non-absorbent and proof against grease, oil, water and other liquids.

Hygiene

Foil is sterile following annealing, and does not harbour or support the growth of bacteria.

Toxicity

Aluminium is present in many fresh vegetables and is non-toxic in amounts and compounds normally encountered. The metal does not accumulate in the body and is non-reactive with virtually all foods, drugs and cosmetics.

Taste, odour

Tasteless and odour-free, alu foil imparts no detectable taste or odour to foodstuffs.

Opacity

Foil is a solid metal. It transmits no light and is a total barrier to light including the UV spectrum.

Reflectivity

Reflects approximately 98% of radiant heat and light.

Non-magnetic

Aluminium is insignificantly magnetic and therefore provides excellent electrical shielding.

Recyclability

Aluminium is easily recycled. Plain aluminium foil can be compacted and re-melted. Laminated aluminium is processed to separate the supporting layers and the aluminium residue is reused in other applications. In addition, the energy contained in the thin foil component of a laminate can be recovered in the form of heat.

How to make an aluminum foil pipe

The aluminum foil pipe is made of aluminum foil and stainless steel.We have a variety of aluminum foil tubes with diameters for your choice.

How to make an aluminum foil pipe

1.Get a large square of aluminum foil and uses for aluminum foil. Take a 12″ square piece of tin foil or aluminum foil .

2.Fold it in half. Fold the square of foil in half, being careful to keep the foil free of wrinkles and tears.

3.Fold it in half again.

4.Create a cone. Roll the square into a tube that is slightly flared at one end (like a very narrow cone).

5.Find the beginning of the bowl.

6.Create the bowl.

7.Add the smokeable material. Insert smoking material of your choice into bowl. You may or may not way to add an aluminum filter before adding in the material.

Specifications of aluminum foil pipe:

1.Full flexible, suitable for medium pressure air conditioning and ventilation system

2.It’s a range of fully flexiblility, easy to connect with ducting

3.Excellent resistance to chemicals

primary competitive advantages of aluminum foil pipe:

1.No need special tools for cutting

2.In case of fire no toxic gas are emitted

3.The product have been successfully tested for fire resistance

4.Can be bent in any direction

Structure: High elastic wire, aluminum foil

Standard Diameter: 3, 4, 5, 6, 8, 10, 12, 14, 16 inches

Standard Length: 3-10M

Temperate range: -30 degree to + 350 degree

Air Velocity: 28m/s

Working Pressure: 250mmAq

Color: Silver

Material: Aluminum Foil

Packing: PE Plastic Packing+Carton Packing

Product Description

Insulated flexible duct made of aluminum foil + pet +steel wire +glass fiber.

Acoustic insulated duct made of aluminum foil + pet + helix steel wire + fiber glass

Apply for low/medium/ high pressure, use for air ventilation in each environment.

Round style, and easy to install oval or round connection.

Fireproofing, at high temperatures or in case of fire, no toxic gas emitted.

Easy to delivery.

Good insulated—heat insulated

Absorb noise—can absorb the noise from the shaking when ventilated

No corrosive—not corrosive the aluminum pipe and metal parts

Durability—not decay, mildew

Fire—resistance

Applications and benefits:

1. Can be used for exhaust venting bathroom vents, clothes dryers, range hoods, fireplace etc.

2. High resistant to corrosion and micro organisms.

3. High degree of flexibility, which allows it to be easily connected to any desired position, especially where pre-cast ducts would be difficult and costly to be installed and can be bent into any configuration.

4. Quick and economical means of correcting misalignment between systems components.

5. Low friction loss and no air leakage if it’s installed in the right way.

6. Low cost in freight and storage.

Aluminum foil for air conditioner/cigarette packaging/decorative

When it comes to the use of aluminium foil, you will think of the aluminium foil packaging. That is because we can see a thin layer of aluminium lunch box when we buy some food. But the use of aluminium foil is very extensive.

Aluminum foil for air conditioner

Aluminum foil for air conditioning is a special data for the manufacture of heat exchangers for air conditioning. The early used alu foil for air conditioning is component foil. In order to improve the surface properties of aluminium foil, anticorrosive inorganic coatings and hydrophilic organic coatings were coated before forming to form hydrophilic foil. At present, hydrophilic foil accounts for half of the total air conditioning consumption, and its utilization rate will be further improved. There is also a hydrophobic foil, which makes the appearance of the fin hydrophobic and avoids the adhesion of condensation water. As hydrophobic foil improves the appearance of thawing technology, there is little production practice at present due to further research.

The thickness of air-conditioning aluminum foil is 0.1 mm to 0.15 mm. With the development of technology, air-conditioning aluminium foil has a further refinement trend, and the thickness of the leading product of aluminum foil is 0.09 mm. In the extremely thin state, aluminum foil has a good shape, its internal design and performance requirements are uniform, small metallurgical defects, less anisotropy, with high strength, good ductility, uniform thickness, good flatness.

Aluminum foil for cigarette packaging

China is the largest cigarette producer and purchasing power in the world. At present, there are 146 large cigarette factories in China, which produce 34 million large boxes of cigarettes and packages of cigarette foil every year. At the same time, 30% choose spray aluminium foil, 70% use calendar aluminium foil and calendar aluminium foil. The consumption of calendar foil is 35,000 tons. With the improvement of citizens’health awareness and the impact of foreign countries on cigarette imports, the demand for cigarette aluminum foil increases. The total demand for cigarette packaging aluminum foil in China accounts for Aluminum foil, at present, two or three domestic aluminium plate manufacturers can produce high-quality foil, technical level and suitable for the world, but the overall quality of domestic foil and the world default value have a certain distance.

Decorative Aluminum Foil

Decorative aluminum foil uses decorative information through aluminium-plastic composite method. It has the characteristics of good color, high reflectivity, light and warmth. Mainly used in architecture, furniture decoration and some gift box packaging. Decoration foil in China’s construction industry has rapidly extended from Shanghai, Beijing, Guangzhou and other key cities to the whole country since the early 1990s. In recent years, the demand for decoration aluminum foil has increased dramatically. It is usually used as information for building walls and interior furniture decoration, and it is also used in the facade and interior design of commercial institutions.

Decorative aluminium foil has the advantages of thermal insulation, moisture-proof, sound insulation, fire prevention, easy cleaning and so on. It has luxurious appearance, processing equipment and fast construction machinery. At present, China’s construction and home decoration industry has formed a trend of using decorative foil. With the rapid development of China’s construction industry and the continuous popularization of decorative foil, the demand for decorative foil will also increase greatly. In addition, the choice of decorative foil packaging abroad is very popular, in recent years in China’s rapid development, it is estimated that there will be better prospects.

Aluminum foil for cables

Cable aluminium foil is sealed and shielded with aluminium foil. It is coated on one or both sides, including aluminium-plastic composite foil, and used as cable shield. Cable foil needs less oil, no holes, high mechanical properties and low overall quality.

Recyclability and cleanliness of aluminium foil

One characteristic of aluminium is that it can be recycled 100% and reused. It can also retain its original characteristics. The regeneration process of aluminium consumes only 5% of the energy consumed by the original production of aluminium, so the emission of harmful gases will be significantly reduced during the regeneration process. Current separation technology can extract aluminum from scrap aluminium products for household use, but requires very little energy.

Aluminum foil is recyclable if it’s free of food residue. Do not recycle dirty aluminum because food contaminates recycling. Try rinsing the foil to clean it; otherwise, you can throw it in the trash.

on the other hand,tin foil was the first commercially available foil and was in use from the late 1800s through the early 1900s. What we call “tin foil” today isn’t the same although it still persists. Luckily aluminum foil does not add a metallic aftertaste like true tin foil.

According to the knowledge of aluminium foil processing factories, if the aluminium foil is not recycled, but directly disposed of in the incinerator, then a characteristic of aluminium appears. After heating, the surface of aluminium foil will oxidize quickly, and then release a lot of energy, which can also be recycled. At this time, aluminium without oxidation will melt and be recycled in the bottom ash of the incinerator.

The aluminium foil manufacturer introduced that the aluminium foil can be applied to various heating methods, such as convective heating oven and microwave heating oven, as well as air oven, and can also heat food packaged with aluminium foil. The use of aluminum foil packaging can greatly shorten the preparation time of cooking, but also can save a lot of energy.

Recycling Aluminum Foil – Unlike cans, recycling aluminum foil is tricky since cans maintain a rigid cylindrical or square shape which makes them easy to rinse. Foil pieces though are almost like paper sheets.

Clean the foil to prepare for it to be sent to the center. One way to do this is to wipe the foil clean. There will be times when the food is tightly stuck to the foil and no amount of wiping will get rid of it. If so, cutting off those sections is the only way to go.

Deliver the cleaned and ready-to-recycle aluminum foil to the local recycling center.

The materials and specifications of aluminium foil tape

Aluminum foil tape, as its name implies, it is mainly made of aluminium foil, acrylic or rubber pressure sensitive adhesive.In generally speaking, aluminium foil tape has good adhesion, strong adhesion, fast heat transfer, good conductive function, moisture-proof, moisture-proof and chemical corrosion resistance.

Aluminum foil tape specifications are generally divided into the following categories:

1. Household aluminium foil material 8011 0 thickness 0.009-0.02 (mm).

2. Food soft packaging aluminium foil: material 8011 1235 1145, thickness 0.009-0.023 (mm),

3. Air conditioning aluminium foil: 8011 3003 1100, thickness 0.07-0.25 (mm)

Aluminum foil tape can only be used in computer display, computer peripheral wire and transformer manufacturing, central air conditioning pipeline, smoking machine, refrigerator, water heater and other pipeline joints, wires, cables, precision electronic products, computer equipment, etc. In addition, it has good effect on electrostatic discharge after grounding; it can be used in electronic industry, aviation and automobile manufacturing industry, box industry, cold gas wrapping and pipes. Heat transfer, such as duct seal; cold steam pipe wrapping and pipeline sealing for refrigeration industry such as electronic industry and refrigerators.

What is extra heavy duty aluminum foil

Sometimes you need something a little stronger than standard aluminum foil. That’s where heavy duty aluminum foil comes in. Our heavy duty foil offering is ideal for tough jobs like:

lining pans for use in the oven

freezing meals ahead or storing leftovers

making foil packets to lock in moisture and flavor when you grill

Where this really matters is when you’re using aluminum foil for cooking. Since regular aluminum foil is thinner than the heavy-duty version, it doesn’t stand up to high heat and weighty items as well.

Heavy duty aluminum foil offers perfect protection against both high heat and freezing cold. Heavy Duty Foil is also available in a wider 18 inch roll, making it perfect for covering or lining larger roasting pans or making or folding larger foil packets.

Aluminum foil rolls and sheets come in a variety of thicknesses, widths, and lengths. Manufacturers often make the width and length of the foil roll easy to find, but the thickness of the foil is often not advertised. Most manufacturers use terms like standard duty, heavy duty, and extra heavy duty to describe foil thickness. Finding the actual thickness from a foil box or manufacturers website is not likely.

This type of heavy duty foil is thicker and sturdier than regular aluminum foil. It’s tough enough to stand up to high heat, heavy food items, and long-term storage in the freezer. Because of the extra thickness, it’s also a better choice for campfire packets.

Regular /Standard Duty and extra heavy duty aluminum foil are made of the same material, but there’s a key difference: the thickness of the foil.

Standard Duty Aluminum Foil – Most standard duty aluminum foil rolls are economical aluminum foil rolls for commercial and home aluminum foil sheets use. Home use standard duty foil rolls are often between 75 ft. and 250 ft. long, offered in a variety of widths. The majority of foil rolls labeled as “Standard Duty” are between .0004 thick and .0007 thick. Which at best is slightly over or one half of a mil in thickness.

Thickness of Aluminum Foil

Heavy Duty Aluminum Foil – By far the most common aluminum foil used for home and commercial use. Most home users buy 75 ft. rolls of Reynolds aluminum foil or a comparable brand for home use. Heavy duty foil provides extra strength and tear resistance. Many cooks use it for baking, grilling, and storage. Most Aluminum foil rolls labeled “Heavy Duty” are between .0008 thick and .001 thick. The extra three thousandths of an inch makes a big difference for a variety of applications.

In a word,This extra-heavy duty aluminum foil comes in a box with a standard cutting edge. It is good for use in cooking, serving and freezing food. Lining pans with roll before cooking makes cleanup easy. Use for grilling to lock in flavor and for freezing to prevent freezer burn. Material(s): Aluminum; Length: 500 ft; Width: 18 in; Packing Type: Box.

What are the processes of aluminium foil for air conditioning

There are two processes for aluminium foil for air conditioning:

(1) Cast rolling -cold rolling trimming -cold rolling -box rolling slitting- finished product annealing -packaging.

(2) Ingot -homogenization annealing -hot rolling -cold rolling- trimming cold rolling -box rolling slitting -finished product annealing -packaging.

Aluminum foil can be divided into industrial aluminum foil and packaging aluminum foil. The chemical composition of industrial aluminium foil is relatively pure, and its thickness is 0.005-0.2 mm. It is mainly used as capacitors, insulation materials and moisture-proof materials in electrical and electronic industries. The thickness of packing aluminium foil is generally 0.007-0.1 mm. There are many kinds of products, such as flat foil, printing foil, colored printing foil and laminated foil. They are mainly used as packaging materials for food, tea, cigarettes, etc.

The smaller thickness and width of aluminium foil produced by belt production method can reach 0.0025 mm and 1800 mm respectively.

Aluminum foil rolling is seamless rolling, and the rolls are always in the state of elastic flattening. During rolling, the thickness of alu foil can be controlled by adjusting rolling force, rolling speed and tension. In rough rolling, the thickness ofalu foil is controlled by rolling force; in finishing rolling, the alu foil thickness decreases with the increase of rolling speed; the greater the tension, the smaller the thickness; in order to prevent fragmentation, the tension is usually chosen as 0.2-0.4 of standard yield strength_0.2 of foil.

In low-speed rolling, the “thick oil-a00 aluminium plate rdquo” is often added to lubricating oil, or “thin oil” is used to adjust the rolling thickness of aluminium foil. Lubricant and roll condition have a very important influence on aluminium sheet foil quality.

Aluminum foil billet comes from cold rolled aluminium coil. It is generally pre-annealed at 340-480 C, and its thickness is 0.4-0.7mm. The pass deformation rate is about 50% and the total deformation rate is over 95%. The foil whose finished thickness is less than 0.01-0.02 mm should be rolled and rolled in double sheets.