Aluminum Foil

Aluminum foil is a metal material made by rolling aluminum into thin sheets and is often used for hot stamping. Its hot stamping effect looks like pure silver foil, so it is called "fake silver foil". Because aluminum is soft, ductile and has a silvery white luster. Additionally, aluminum foil sheets can be used for printing purposes when these rolled sheets are laminated to paper using substances such as sodium silicate.

Aluminum foil is prone to oxidation, causing it to darken in color, and can easily lose color when rubbed or touched. Therefore, it is not suitable for long-term storage, such as book covers that require hot stamping.

Aluminum foil is a soft metal film with many advantages, such as moisture-proof, air-tight, light-shielding, abrasion resistance, fragrance retention, non-toxic and odorless, etc. Its elegant silver-white luster makes it easy to process beautiful patterns and patterns in various colors, so it is very popular among people.

When aluminum foil is combined with plastic and paper, the shielding properties of the aluminum foil are integrated with the strength of the paper and the heat sealing properties of the plastic, further improving the shielding performance against water vapor, air, ultraviolet rays and bacteria required as a packaging material. This feature greatly broadens the application market of aluminum foil.

Items packaged in aluminum foil composite packaging are fully isolated from external light, moisture, etc., and thus are completely protected. Especially for the packaging of steamed food, the use of composite aluminum foil materials can ensure that the food does not deteriorate for at least one year. In addition, this packaging material is very convenient to heat and open, making it very popular among consumers.

Aluminum foil parameters

• Aluminum alloy: 1xxx, 3xxx, 8xxx series, etc.
• Aluminum status: O-H112, etc.
• Thickness: 0.006mm - 0.20mm
• Width: 50mm - 1500mm

Advantages of aluminum foil

• 1. Cheap, reusable and recyclable, it is a popular environmentally friendly material in the world today.
• 2. Beautiful aluminum foil containers are leak-proof, sturdy, easy to clean and keep food fresh. Aluminum has good electrical conductivity and can speed up baking and freezing. Aluminum foil containers can restore their original appearance faster and better than other packaging materials.
• 3. Using environmentally friendly aluminum foil containers will not have any impact on the environment. Safe and convenient to use. Using aluminum foil containers instead of plastic products to package fast food can protect the environment and reduce white pollution.

Aluminum foil classification

Aluminum foil is divided according to alloy

• 1000 series metal pure aluminum foil

  The range consists primarily of commercially pure aluminum with a minimum aluminum content of 99%. These alloys offer excellent corrosion resistance, high thermal and electrical conductivity, and good formability. 1000 Series pure aluminum foil is commonly used in packaging, insulation and household applications due to its flexibility and corrosion resistance.

  1235 Aluminum Foil

• 3000 series alloy metal aluminum foil

  The 3000 series consists primarily of aluminum-manganese alloys. These alloys are not as strong as the 2000 or 7000 series, but have good formability, corrosion resistance, and weldability. 3000 Series aluminum foils are commonly used in food packaging, household foils, and a variety of industrial applications requiring moderate strength and good corrosion resistance.

• 8000 series alloy metal aluminum foil

  8011, 8021 and 8079 aluminum foil are the key products of the 8 series aluminum foil. Due to their excellent sealing, plasticity and anti-corrosion properties, they are widely used in food and beverage, cigarettes, medicine, household and daily use and other fields.

  8011 Aluminum Foil 8079 Aluminum Foil 8021 Aluminum Foil 8006 Aluminum Foil

Aluminum foil is divided according to thickness

• 1. Heavy gaugefoil
• 2. Medium gauge foil
• 3. Light gauge foil

• 1. Thick foil ("heavy gaugefoil"): foil with a thickness of 0.1~0.2mm.
• 2. Single zero foil ("medium gauge foil"): foil with a thickness of 0.01mm and less than 0.1mm/.
• 3. Double zero foil ("light gauge foil"): The so-called double zero foil is a foil with two zeros after the decimal point when its thickness is measured in mm. It is usually an aluminum foil with a thickness less than 0.01, that is, an aluminum foil with a thickness of 0.005~0.009mm.

Aluminum foil is divided according to shape

Aluminum foil can be divided into roll aluminum foil and sheet aluminum foil according to its shape. Aluminum foil deep processing wool is mostly supplied in roll form, and sheet aluminum foil is only used in a few handicraft packaging situations.

Aluminum foil can be divided according to status

• 1. Rigid aluminum foil
• 2. Semi-rigid aluminum foil
• 3. Soft aluminum foil

• 1. Hard aluminum foil: Aluminum foil that has not been softened (annealed) after rolling. If it is not degreased, there will be residues on the surface. Therefore, rigid foil must be degreased before printing, lamination, and coating. If it is used for forming processing, it can be used directly.
• 2. Semi-hard aluminum foil: Aluminum foil whose hardness (or strength) is between hard foil and soft foil, usually used for forming processing.
• 3. Soft aluminum foil: Aluminum foil that has been fully annealed and softened after rolling. The material is soft and there is no residual oil on the surface. Most application areas such as packaging, lamination, electrical materials, etc. use flexible foils.

Aluminum foil is classified according to surface condition

• Single sided light aluminum foil
• Two-sided glossy aluminum foil
• Color Coated Aluminum Foil
• Anodized Aluminum Foil
• Carbon coated aluminum foil substrate
• Printed aluminum foil

• Single-sided aluminum foil

  Double-rolled aluminum foil has one side bright and one side darkened after being rolled. Such aluminum foil is called single-sided light aluminum foil. The thickness of such aluminum foil is usually less than 0.025mm.

• Double-sided aluminum foil

  Due to the different surface roughness of the rollers, the double-sided aluminum foil is divided into mirror double-sided aluminum foil and ordinary double-sided aluminum foil. The thickness is generally greater than 0.01mm.

• Color Coated Aluminum Foil

  Color Coated Aluminum Foil refers to aluminum foil coated with a layer of color. The coating is usually applied through a process such as painting or coating with colored resins. This type of aluminum foil is often used in packaging applications where aesthetics are important, such as candy packaging, chocolate packaging and gift decoration packaging in the food industry.

• Anodized Aluminum Foil

  Anodized aluminum foil is aluminum foil that has undergone an electrolytic process called anodizing, which forms an oxide layer on the surface of the aluminum to enhance its corrosion resistance. Anodized aluminum foil is used in applications where corrosion resistance is critical, such as construction elements, automotive components and electronic equipment.

• Carbon coated aluminum foil substrate

  Natural sand is facing the problem of increasing depletion. In order to protect the source of natural sand, many countries have banned the procurement of sand from river banks and coastlines.

• Printed aluminum foil

  Printed aluminum foil is a method of printing to form various patterns, patterns, and text on the surface of the aluminum foil. The pattern can be one color, up to 12 colors, freely selectable.

Aluminum foil is divided according to processing status

Aluminum foil can be divided into plain foil, embossed foil and composite foil according to the processing state.

• Plain foil: Aluminum foil that has not undergone any other processing after rolling, also called light foil.
• Embossed foil: Aluminum foil with various patterns embossed on the surface.
• Composite foil: Composite aluminum foil formed by laminating aluminum foil with paper, plastic film, and cardboard.

Soft aluminum foil can also be further pressed into 40% foil for high-end decoration.

Aluminum foil characteristics

Aluminum foil has a clean, hygienic and shiny appearance. It can be made into integrated packaging materials with many other packaging materials, and the surface printing effect of aluminum foil is better than other materials. In addition, aluminum foil has the following characteristics:

• (1) The surface of aluminum foil is extremely clean and hygienic, and no bacteria or microorganisms can grow on its surface.
• (2) Aluminum foil is a non-toxic packaging material that can be in direct contact with food without any danger to human health.
• (3) Aluminum foil is a tasteless and odorless packaging material that will not cause any odor to the packaged food.
• (4) If the aluminum foil itself is not volatile, it and the packaged food will never dry or shrink.
• (5) No matter whether it is at high temperature or low temperature, there will be no grease penetration in the aluminum foil.
• (6) Aluminum foil is an opaque packaging material, so it is a good packaging material for products exposed to sunlight, such as margarine.
• (7) Aluminum foil has good plasticity, so it can be used to package products of various shapes. Containers of various shapes can also be made at will.
• (8) Aluminum foil has high hardness and high tensile strength, but its tear strength is low, so it is easy to tear.
• (9) Aluminum foil itself cannot be heat-sealed. It must be coated with a heatable material, such as PE, on its surface to achieve heat sealing.
• (10) Adverse reactions may occur when aluminum foil comes into contact with other heavy metals or heavy metals.

Aluminum foil applications

Main disadvantages of aluminum foil

• 1. Pinholes: Mainly caused by dust and impurities in raw materials, rolls and rolling processes. Improving metallurgical quality, processing conditions and using appropriate rolling techniques can reduce the number of pinholes.
• 2. Roller marks, roller holes, and uneven gloss: caused by rollers, affecting surface quality. Regular maintenance of the rolling mill and rolls, proper cleaning and grinding of the rolls can improve these defects.
• 3. Wrinkling: Wrinkles will form during winding or unwinding due to insufficient tension or poor plate shape.
• 4. Bright spots, bright marks, and bright spots: caused by improper use of double oil or uneven rolling, affecting the appearance quality.
• 5. Thickness difference: Due to the thinness and microscopic conditions of aluminum foil, it is difficult to control the thickness difference and requires a variety of conditions to ensure.
• 6. Oil stain: Excess oil is left on the surface after rolling, which affects the surface quality of decoration or packaging materials.
• 7. Water spots: There are water drops on the foil surface before rolling, and white spots formed after rolling affect the surface quality.
• 8. Vibration marks: periodic transverse waves on the surface, caused by roller grinding or oil film discontinuity.
• 9. Tension lines: Parallel stripes are formed in the longitudinal direction of the aluminum foil, which are related to the tension and roller roughness.
• 10. Slits: Splits along the longitudinal direction during rolling, often accompanied by metal wires.
• 11. Air channel: During rolling, strips may appear and be crushed, which is related to the gas content of the raw material.
• 12. Coiling defects: mainly refers to loose winding or loose inside and tight outside, which affects subsequent processing.

These defects mainly include holes, surface conditions, plate shape and size that affect subsequent processing, etc.

Aluminum foil anti-corrosion measures

Corrosion mainly results from the aluminum foil becoming damp or exposed to water during production and transportation. In order to control the generation of corrosion waste, the following anti-corrosion measures need to be taken:

• 1. Ensure there is no moisture in the compressed air and strengthen the management of air dryers.
• 2. Control the water content of rolling oil below 400×0.000001, and strengthen the management of rolling oil.
• 3. Use sealed packaging and put an appropriate amount of desiccant in each roll of aluminum foil.
• 4. Ensure that the humidity of the wooden shaft and board of the packaging box does not exceed 18%, and the temperature of the packaging aluminum coil does not exceed 45 degrees Celsius.
• 5. When transporting from a low temperature area to a high temperature and high humidity area, do not open the sealed package immediately.
• 6. Do not place aluminum foil rolls in places where there is leakage of rain or snow on the roof of the workshop or warehouse.
• 7. When transporting aluminum foil to high temperature areas, strengthen the sealing of the packaging and add desiccant if necessary.
• 8. When packaging aluminum foil products in the rainy season, strengthen the sealing packaging and increase the use of desiccant.

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