Composite aluminum foil

What is composite aluminum foil

Composite aluminum foil is a functional material composed of aluminum foil and other materials. It has various properties such as antioxidant, heat resistance, corrosion resistance, and heat insulation, and is widely used in industry, construction, food packaging and other fields.

As a common material, aluminum foil is light, thin, flexible, effectively blocks ultraviolet rays and high temperatures, and has good thermal conductivity. Use aluminum foil in combination with other materials to bring into play their respective advantages and improve overall performance.

What are the composite materials of composite aluminum foil?

PET

PET is the abbreviation of “Polyethylene Terephthalate”, a common thermoplastic polymer and a member of the polyester family. PET materials are widely used worldwide, especially in the fields of packaging, fibers and engineering plastics.

When compounded with aluminum foil, PET materials can provide good mechanical properties, such as stiffness, impact resistance and abrasion resistance; while aluminum foil provides excellent barrier properties, such as preventing oxygen, moisture and light penetration. This PET/aluminum foil composite material is often used in the packaging of high-end food, pharmaceuticals and chemical products to ensure product shelf life and stable quality. In addition, PET can also be combined with multi-layer films to make heat shrink films, label films and other functional packaging materials.

PE/LDPE

PE refers to “Polyethylene”, which is a very common synthetic resin. It is a high molecular polymer and is made by polymerizing ethylene monomer. Polyethylene is widely used around the world due to its excellent physical properties and chemical stability.

Polyethylene can be divided into various types based on molecular weight, crystallinity and branched chain structure, such as:

Low-density polyethylene (LDPE, Low-Density Polyethylene):

It has good flexibility, ductility and transparency, and is commonly used in plastic bags, plastic wrap, agricultural mulch films, flexible pipes and other products.

Linear Low-Density Polyethylene (LLDPE, Linear Low-Density Polyethylene):

Compared with LDPE, it is more linear in structure, has stronger mechanical properties, and is slightly less transparent. It is widely used in plastic films, plastic bags, pipes, cable insulation materials and other fields.

High-density polyethylene (HDPE, High-Density Polyethylene):

It has high strength, hardness and wear resistance, and is relatively heat-resistant. It is mainly used to make bottles (such as dish soap bottles, milk bottles), buckets, toys, water pipes, large containers, non-food grade packaging and various industries. Parts etc.

Ultra-High Molecular Weight Polyethylene (UHMWPE, Ultra-High Molecular Weight Polyethylene):

It has extremely high impact strength, self-lubrication and wear resistance, and is mainly used in products with high performance requirements, such as bulletproof materials, skating rink panels, artificial joints, marine cables and high-end sports equipment parts.

PE (polyethylene) and aluminum foil composite is to combine polyethylene film and aluminum foil through adhesive or other composite technology to form a composite material with a variety of excellent properties. This composite material combines the advantages of PE and aluminum foil

PVC/PVDC

PVC is the abbreviation of “Polyvinyl Chloride”, which is a common synthetic polymer material produced by the addition polymerization of vinyl chloride monomer (VCM). PVC has a wide range of uses, especially in the fields of construction, packaging, wires and cables, medical equipment, furniture decoration, etc.

PVC (polyvinyl chloride) and aluminum foil composite refers to bonding PVC material and aluminum foil together through a specific process to form a composite material with multiple properties. This PVC aluminum foil composite material combines the advantages of both materials.

PVC characteristics:

• Weather resistance: PVC material itself has good aging resistance, corrosion resistance and certain weather resistance.
• Strength and flexibility: PVC can provide basic structural strength and can be adjusted to achieve different hardness and flexibility requirements through formula adjustment.
• Electrical insulation: PVC is an excellent electrical insulation material, suitable for use in sheaths of wires and cables or other places that require insulation.

Aluminum foil characteristics:

• Barrier performance: Aluminum foil has extremely high barrier properties, which can effectively block the penetration of moisture, oxygen, ultraviolet rays, etc., ensuring that the internal materials are not affected by the external environment.
• Resistant to thermal radiation: Aluminum foil can reflect thermal radiation and help maintain stable internal temperature, so it has a significant effect in thermal insulation and heat insulation applications.
• Plasticity: Although aluminum foil is very thin, it still has a certain degree of plasticity and ductility, and its practicality and adaptability can be enhanced through compounding.

EPE

EPE is the abbreviation of “Expanded Polyethylene”, also known as pearl cotton, which is a new type of environmentally friendly packaging material. It uses a physical foaming process to heat low-density polyethylene (LDPE) and add a foaming agent. It is extruded by an extruder and then cooled and shaped to form numerous independent closed-cell foam materials.

EPE material and aluminum foil are bonded together through a special process to form a new packaging or insulation material with dual performance advantages. EPE usually takes the form of pearl cotton, which is lightweight, soft, elastic, and shock-absorbing. It is widely used as cushioning packaging and filling materials for various products.

Common alloys of Composite aluminum foil

Common alloys used to make aluminum foil mainly include the following:

• 1000 series: such as 1235 aluminum foil, which contains more than 99% aluminum, has few impurities and good conductivity. It is mainly used in food packaging, pharmaceutical packaging and other fields.
• 3000 series: This type of alloy mainly adds manganese element and has a certain strength, but is less commonly used in aluminum foil production.
• 8000 series: Such as 8011 aluminum foil, which is a commonly used alloy. Due to its good formability and rust resistance, it is widely used in various types of flexible packaging, pharmaceutical packaging aluminum foil, cable shielding and container foil, etc.
• 8021 aluminum foil: It is also one of the 8000 series. In addition to being used for ordinary packaging, it is also often used to make high-barrier packaging materials because of its good heat sealing performance.

Why is aluminum foil used in combination with other materials?

There are several main reasons for the composite use of aluminum foil and other materials:

• Improved safety: Composite aluminum foil can achieve the “short circuit effect” and significantly improve the thermal stability of the battery. When the battery is struck and broken by external force, almost no metal burrs are produced, which avoids puncturing the battery separator, reduces the risk of battery short circuit, and greatly improves battery safety.
• Improve energy density: While the thickness of composite aluminum foil remains unchanged, the amount of aluminum used is greatly reduced, making it lighter in weight. The amount of aluminum used inside the battery is reduced, and the energy density is increased under the same weight, thereby improving the battery’s endurance.
• Improve barrier properties: Aluminum foil is easy to form pinholes during packaging and use, which reduces its barrier properties. Therefore, aluminum foil is often made into composite materials with films, polymers or other metal sheets.
• Improve mechanical strength and sealing properties: Although aluminum foil is soft and foldable, it has low mechanical strength and poor sealing properties. By compounding aluminum foil with high-strength, heat-sealable plastic films, barrier properties, mechanical properties and heat-sealing properties can be obtained. Aluminum-plastic composite flexible packaging material with excellent performance.
• Protecting the quality and safety of pharmaceuticals: Aluminum foil can be sealed through heat sealing or cold sealing technology to ensure the sealing of pharmaceutical packaging. This can help protect medicines from external contamination and oxidation.

Therefore, these advantages of composite aluminum foil are exactly the problems that traditional battery aluminum foil urgently needs to solve. With the development of new energy and the penetration of downstream application scenarios, composite aluminum foil is expected to replace traditional battery aluminum foil and even extend to more other fields, becoming the next blue ocean of new materials.

Application fields of composite aluminum foil

Composite aluminum foil is a functional material made of aluminum foil and other materials. It has various properties such as antioxidant, heat resistance, corrosion resistance, and heat insulation. It is widely used in industry, construction, food packaging and other fields.

As a common material for composite materials, aluminum foil has the advantages of being light, thin, and flexible. It can effectively block ultraviolet rays and high temperatures, and also has good thermal conductivity. Therefore, the composite use of aluminum foil with other materials can bring into play their respective advantages and improve the overall performance of the material.

In the field of food packaging, composite aluminum foil is widely used. Due to the antioxidant properties of aluminum junctions, it can well protect food from the influence of the external environment and extend the shelf life. At the same time, composite aluminum foil can effectively isolate the transmission of oxygen, moisture and taste, maintaining the taste and texture of food. In addition, aluminum foil also has good thermal conductivity and can quickly dissipate heat, allowing the food to cool quickly during the packaging process.

In the field of construction, aluminum box composite materials are often used as thermal insulation materials. Due to the heat resistance of the aluminum box, it can effectively isolate the indoor and outdoor temperature differences, reduce energy transmission losses and improve the energy-saving performance of the building. In addition, aluminum foil also has good anti-corrosion properties, which can prevent rain and chemicals in the air from corroding building materials and extend the service life of the building.

In the industrial field, composite aluminum foil is often used in the packaging of electronic products. Because the aluminum junction has good electrical conductivity, it can effectively shield electromagnetic radiation and protect the normal operation of electronic products. At the same time, aluminum foil also has good antioxidant properties, which can prevent oxidation from damaging electronic components.

In short, composite aluminum foil, as a functional material, is widely used in food packaging, construction, electronic products and other fields. Its advantages include light flexibility, hydrogenation resistance, heat resistance, heat insulation and corrosion resistance. It can effectively improve the overall performance of the material and meet the needs of materials in different fields.

Packaging conforms to aluminum foil

Composite aluminum foil bags are made of aluminum and other high-barrier materials after dry compounding. Material: PET/NY/AL/PE (general packaging) PET/NY/AL/CPP (high temperature cooking); VMPET/CPE or PET/AL/NY/CPE (anti-static shielding bag). Thickness: 70~180, micron: generally customized according to customer requirements, bag shape: three-side sealing, self-standing zipper bag, yin and yang bag, center sealing organ. Product use: cosmetics, facial masks, medicinal materials, medicines, various solutions, various foods, various PC boards, IC integrated circuits, optical drives, hard drives, LCD electronic components, welding materials, electronic products, circuit boards, etc. Food packaging films, medicinal packaging films, pesticide packaging films, seed packaging films, industrial product packaging films, facial mask packaging films, solid packaging films, etc. on the market are all composite aluminum foil bags.

The characteristics of composite aluminum foil bags include: PET: good printing effect; N Y: low oxygen permeability; A L: strong barrier and opaque; P E: ordinary packaging inner layer; CPP: high-temperature cooking inner layer. The advantages include: strong air barrier performance, anti-oxidation, waterproof and moisture-proof; strong mechanical properties, high blast resistance, puncture resistance and tear resistance; high temperature resistance (121℃), low temperature resistance (-50℃), oil resistance, It has good fragrance retention performance; it is non-toxic and odorless, and meets the hygienic standards for food and drug packaging; it has good heat sealing performance, softness and high barrier properties.

Aluminum foil for power batteries

Although the market demand for battery aluminum foil is strong, as a key auxiliary material for batteries, it also needs to face safety and battery life issues. Composite aluminum foil can solve these problems.

Composite aluminum foil is a new type of composite foil that uses organic polymer materials such as polymer PET as a support layer, deposits metal aluminum on its surface, and plating it into a sandwich structure of “aluminum-PET polymer material support layer-aluminum”. Batteries made from this material have the characteristics of high safety and high energy density.

• (1) Improve thermal runaway and improve battery safety. The sandwich structure allows the composite aluminum foil to achieve the “short circuit effect” and significantly improve the thermal stability of the battery: when the battery is impacted and broken by external force, almost no metal burrs are produced, which avoids puncturing the battery separator, reduces the risk of battery short circuit, and greatly improves the battery life. Safety; in addition, even if the battery is internally short-circuited due to puncture or other reasons, the short-circuit cannot be sustained due to the fusing effect of the composite current collector, thus avoiding the risk of battery combustion and explosion.
• (2) Light weight, which is helpful to increase energy density. While the thickness of composite aluminum foil remains unchanged, the amount of aluminum used is greatly reduced, which reduces its quality. The amount of aluminum used inside the battery is reduced, and the energy density is increased under the same weight, thereby improving the battery’s endurance.

These advantages of composite aluminum foil are exactly the problems that traditional battery aluminum foil urgently needs to solve. With the development of new energy and the penetration of downstream application scenarios, composite aluminum foil is expected to replace traditional battery aluminum foil and even extend to more other fields, becoming the next blue ocean of new materials.

Different from the traditional battery aluminum foil rolling preparation process, the composite aluminum foil vacuum coating equipment mainly deposits directly on the surface of the organic film through vacuum evaporation method, so that the metal aluminum layer finally reaches the required thickness to meet the technical requirements of the battery current collector. The preparation of composite aluminum foil adopts a full vacuum deposition process, which is simpler, has no pollution in the production process, and has no requirements for environmental protection qualifications. It is a truly all-dry environmentally friendly process.

EPE pearl cotton composite aluminum film (aluminum foil)

Pearl cotton composite aluminum foil is composed of pearl cotton and aluminum foil. There are many names, such as: pearl cotton composite aluminum film, aluminum foil moisture-proof floor mat, aluminum composite film pearl cotton, etc. Compared with other pearl cotton composite products, the practical function of pearl cotton composite aluminum foil is relatively single. But in terms of global warming and the continued high temperature weather this summer, it is a very effective insulation material! After being combined with pearl cotton, it combines the best of both worlds and is shockproof, waterproof, moisture-proof, dustproof and non-toxic.

Application fields: The demand for pearl cotton composite aluminum film has increased sharply in recent years. It is usually used as a decoration material for inner walls of buildings and indoor furniture. It is also widely used in facades and interior decoration of commercial institutions, especially in packaging, mechanical and electrical and construction industries. Large areas have become essential. The composite aluminum film market is not large horizontally, but it can extend the industrial chain vertically and process aluminum foil materials into end products. The high added value of the products can offset the lack of professional market capacity. Relying on the competitive advantages of professional brands, it can still Obtain better operating benefits.

Introduction to the advantages of composite aluminum foil insulation materials

• (1) Simplify the structure and avoid waste;
• (2) There is no need to install a roof exhaust system;
• (3) The waterproof layer is protected from damage to the waterproof layer by thermal stress, ultraviolet rays and other factors;
• (4) Excellent moisture resistance gives it long-term stable thermal insulation performance and compressive strength;
• (5) It can maintain long-term thermal insulation function, and its durability is equal to the life of the building;
• (6) Hydrophobic insulation materials can be cut and processed with electric heating wires or conventional tools, making construction quick and easy;
• (7) Future roof maintenance will not damage the materials and is convenient and simple;
• (8) High-efficiency insulation materials are used, which is in line with the development direction of building energy-saving technology.