Foil Containers Production Technology Application

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Aluminium Foil Containers

Aluminum foil containers are made of aluminum foil with a certain degree of strength and toughness, processed by stamping and forming. Compared with other materials, it has the characteristics of light material, high barrier, anti-ultraviolet ray, moisture-proof and anti-corrosion as well as long shelf life, etc. At the same time, as the foil can better maintain the freshness and moisture of the food, it is more in line with the modern concept of environmentally friendly and healthy life.

In summary, aluminum foil pans have the following characteristics:

  • The raw materials are non-toxic. Healthy and safe, no harmful substances are produced when heated.
  • Strong barrier properties. It can protect the original flavor of food and extend the shelf life of food.
  • More fresh. It can better maintain the freshness and moisture of food.
  • High recycling value. Efficient recycling, protecting the environment and saving resources.
  • More beautiful. Good decorative properties highlight product differentiation and grade.
  • The processing is more environmentally friendly. It is light in weight, can be produced in batches, and has obvious cost-effective advantages.

Key Technical Requirements and Standards

General quality requirements

  • Alu foil containers are not allowed to leak.
  • There should be no oil stains and other residues on the outside and inside of the aluminum foil pan.
  • The aluminum foil pans should be in good shape.
  • Aluminum foil trays should have a certain strength.

Food hygiene standards

As a container that comes into contact with food that can be directly eaten, aluminum foil used in lunch boxes must comply with international food hygiene standards. Specifically, aluminum foil should meet the following requirements: The material should comply with GB4806.9-2016 “National Food Safety Standard for Food Contact Metals” Materials and Products”, exported products should comply with local food hygiene standards, such as FDA certification in the United States and Kosher certification in Jewish areas. Generally speaking, various toxic elements in the aluminum foil alloy components must meet the requirements, such as: Pb ≤ 0.2mg/kg, Cd ≤ 0.02mg/kg, As ≤ 0.04mg/kg. At the same time, some countries and regions also require Ni, Cr6+ and other toxic elements put forward specific requirements.

The surface of the aluminum foil is clean with no oil stains or aluminum powder residue

According to EU REACH Regulation No. 1907/2006, it meets the content screening test standards for 210 chemical substances of high concern (SVHC).

Container Aluminum Foil Production Technology

Aluminum foil for pans, generally called container foil, is an aluminum foil material produced through a series of molding processes such as casting, calendering, and heat treatment. According to the type of alloy, it can generally be divided into the following types:

3003
  • Features: Medium to high strength, generally 140Mpa, suitable for the production of ultra-thin and pleated lunch boxes, which is beneficial to reducing the weight and cost of lunch boxes.
  • Disadvantages: Not suitable for adding large amounts of recycled aluminum. The casting and rolling process is used to produce raw materials, which is difficult to cold work and has high production costs.

3004
  • Features: High strength, up to 270Mpa, suitable for punching large dinner plates; high alloy content, can be produced using a large amount of recycled aluminum.
  • Disadvantages: Insufficient elongation makes it difficult to meet deep drawing conditions; when a large amount of recycled aluminum is used, excessive heavy metal content is prone to occur.
8006
  • Features: Medium to high strength, generally 140Mpa, suitable for the production of wrinkle-free lunch boxes; high acceptance of recycled aluminum.
  • Disadvantages: Not suitable for adding large amounts of recycled aluminum. The strength is medium and the thickness of the aluminum foil is thick, which is not conducive to reducing the cost of the lunch box.
8011
  • Features: Good molding performance, strength is generally 120Mpa, suitable for production of banquets without skirt wrinkles; low material processing cost.
  • Disadvantages: Low strength, not conducive to reducing the cost of lunch boxes; low alloy content, not suitable for adding a large amount of recycled aluminum.

In addition to classification according to alloys, coated container foils have also developed rapidly. Therefore, container foils have been classified into plain foils and coated container foils.
Color container aluminum foil is generally used to produce wrinkle-free lunch boxes and is widely used in various high-end food packaging, as well as in the packaging of instant or semi-finished food ingredients such as hot pot and crayfish. According to the surface treatment method, it can be divided into plain foil and coated container foil. Coated container foils can be divided into heat-sealable container alu foils and non-heat-sealable container foils according to functional classification; according to coating classification, they can be divided into oily coating container foils and water-based coating container foils.

Container Foil Production Line

Ordinary container foil production

  1. Hot rolling: Generally used for the production of blanks for 3004 alloy container foil. The commonly used process roadmap is: hot rolled coil-cold rolling-finishing and trimming-cold foil rolling-finished product-(slitting)-finished product annealing;
  2. Continuous casting and rolling: It can be used for the production of blanks for 3004, 3003, 8011 and 8006 alloy container foils. The commonly used process roadmap is: continuous casting and rolling coil-(homogenization annealing)-cold rolling-finishing and trimming-foil rolling-finished product-(slitting)-finished product annealing;
  3. Casting and rolling: It can be used for the production of blanks for 3003, 8011, and 8006 alloy container foils. The commonly used process roadmap is: cast rolled coil – (homogenization annealing) – cold rolling – finishing trimming – foil rolling – finished product – (slitting) – finished product annealing.

Coated container foil production

According to the classification of production methods, the container foil coating process can be divided into two types: printing and roller coating.

  1. Printing: Coated container foils produced using printing processes are mostly used for outer surface decoration and products with color recognition functions. The main feature of this process is that it can achieve multiple color overprints to meet the needs of product aesthetics.
  2. Roller coating: When the roller coating process is used to produce coated container foil, its application range is wider, but the color is highly restrictive. It is mostly used for batch coating of single-product paints, and can realize material processing with special functional requirements (such as heat sealing) .

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