Aluminum foil is not only soft in texture, has good ductility, is easy to process, but is also light and beautiful, easy to recycle, and is beneficial to environmental protection. It is one of the most commonly used materials in modern packaging. In addition, since aluminum foil has high magnetic permeability, good magnetic absorption capacity, electromagnetic wave shielding ability, and good heat resistance, it is also commonly used in packaging electronic equipment and semiconductor items.
Since aluminum foil easily forms pinholes during packaging and use and reduces its barrier properties, aluminum foil is often used in composite materials made of paper, polymer polymers or other metal sheets. Practice has proved that aluminum foil composite materials can greatly improve the barrier properties of packaging and improve the mechanical strength and mechanical properties of aluminum foil. They are especially suitable for making composite flexible packaging and packaging linings, and are widely used in the packaging of food, medicine, cosmetics, cigarettes and other commodities.
Aluminum foil composite paper
Using the moisture-proof, rust-proof, gas-resistant and corrosion-resistant aluminum foil, it is made into aluminum foil composite paper by bonding it to the paper, or using thermoplastic plastic film as adhesive to combine aluminum foil with paper into multi-layer composite paper. This composite paper combines the high barrier properties of aluminum foil and the folding and impact resistance of paper materials, and becomes a high-performance packaging material. Most of the composite components in the material are non-toxic and odorless materials, which will not cause pollution to the interior and the human body, and will easily meet the hygiene and safety standards of packaging. At the same time, the resin in it can be decomposed when heated to high temperatures, which will separate the paper and aluminum foil, which greatly improves the recycling and regenerative properties of the material, reduces the waste of materials and the load on the environment.
At present, there are many varieties of this type of aluminum foil composite paper, and different papers can be used according to different needs. Due to the high barrier properties of aluminum-plastic composite paper and the adaptability of multiple packaging, it is now widely used in both industrial product packaging and food packaging. In particular, aluminum foil and paper are used in cigarette packaging, which has accounted for 40% to 50% of aluminum foil consumption.

At present, my country is the world's largest cigarette producer and consumer. Because of its high flexibility, decorativeness and protection, sticker aluminum foil has basically replaced asphalt moisture-proof paper and has become the dominant packaging material for cigarette packaging, which will also gradually withdraw from the field of cigarette packaging. The foil lining in the cigarette bag can better prevent moisture, mildew, dryness and smell. The composite of smoky foil adopts the wet foil technology, which has better production efficiency, economy and environmental protection than dry foil and heat fusion bonding. It uses water-soluble or water-dispersible adhesive to bond aluminum foil with porous and highly hygroscopic lining paper, eliminating a series of problems caused by the use of alum solvents in dry combinations, such as pollution of the environment, residual solvents in the product, additional waste gas recovery and emission devices, etc., so that the production process and products are more hygienic and safe. Its process is simple and has fewer processes. Thinner aluminum foil and backing paper can be used to reduce raw material usage and energy consumption; its fast bonding speed and high bonding fastness can reduce manufacturing costs. At present, wet foil has become the best production method for tobacco foil to be widely promoted.
Aluminum-plastic composite can material
Aluminum-plastic composite cans are made of aluminum foil, plastic film, kraft paper (paperboard), and can be made into various forms of packaging cans such as square, cylindrical, rectangular, and conical. Among them, cylindrical aluminum foil composite cans (hereinafter referred to as LFG cans) first appeared in the United States, and many countries now use this packaging form. The characteristics of LFG cans are lightweight, low-priced, about 20% lighter than aluminum cans, and about 20% lower cost than tinplate cans, and of course they are cheaper than aluminum cans. They have good moisture resistance, sealing, light shielding and barrier properties for liquid and solid contents, especially avoiding pollution at the welds of ordinary tinplate cans; their stiffness and mechanical strength are moderate, and their compressive strength, axial collapse force and end cap disengagement force are high, which is especially suitable for packaging of frozen foods.
This composite material is also non-toxic, odorless, and does not contaminate the contents. It can be reused and recycled. Using it to replace metal thin plate cans such as tinplate can avoid pollution caused by metal welds, and further reduce costs and improve economic benefits.
At present, LFG tanks made of this material have been widely used in the packaging of engine oil and some simple foods such as potato chips, and will gradually occupy new fields such as pressure vessels and cooking tanks. For example, further improve the strength of the tank body, end cap structure, etc., continuously improve the quality of the LFG tank, and can also occupy a place in liquid packaging containers.
Aluminum-plastic composite soft film
Although aluminum foil is soft and foldable, it has low mechanical strength and poor sealing properties. By combining aluminum foil with high-strength, heat-sealable plastic film, aluminum-plastic composite flexible packaging materials with excellent barrier properties, mechanical properties and heat-sealing properties can be obtained. It is widely used in food packaging, cooking bags, chemical and industrial product packaging, and military product packaging.

For example, an aluminum foil bag used as soft canned food packaging material is a composite material with a three- or four-layer structure with an intermediate layer of aluminum foil. This soft canned aluminum foil bag has good mechanical properties and sealing processing properties, good moisture-proof, gas-resistant and fragrant, good oil-resistant corrosion resistance, and is non-toxic, odorless, odorless, hygienic, safe and reliable, and convenient to print. It is suitable for automated and mechanized operations, and is lighter than metal cans, more economical and more energy-saving.

Aluminum foil composite cooking bags are also a widely used aluminum-plastic composite flexible packaging material. It is made of multi-layer composite of aluminum foil and plastic film. It is a packaging material with airtightness, high barrier properties, high flexibility and certain heat resistance. Aluminum foil composite steaming bags have the following advantages: they significantly extend the shelf life of food, can withstand high-temperature sterilization treatment of 120-150℃, and can reach 1.5-2 years, effectively maintain the nutritional level of food, and do not destroy the color and taste. At present, aluminum-plastic composite steaming bags have been widely used in sauce-shaped, paste-shaped, and solid steaming food packaging and space food packaging.
Aluminum-plastic composite hose packaging material
Aluminum-plastic composite materials have good isolation properties, are not easy to crack, have beautiful appearance, bright colors, are clean and hygienic, are easy to use, have soft feel and good wrinkle resistance. Hoses made of this material are better than all-aluminum hoses and can be used as packaging materials for toothpaste, ointment, cosmetics, detergents, chemical supplies, pigments, etc. Among them, toothpaste packaging consumes the largest amount. With the rapid popularization of domestic aluminum-plastic composite hoses production lines, the cost of aluminum foil hose toothpaste is reduced, and the utilization rate of aluminum-plastic composite materials used for toothpaste packaging will increase rapidly.
Aluminum foil composite hoses are made of aluminum foil, plastic or resin as substrates, and are made into aluminum foil composite belts through certain composite methods, and then processed into tubular semi-rigid packaging products by a special tube making machine. They are a renewal product of all aluminum hoses. They are mainly used for semi-solid (paste, exposed, colloidal) small-capacity sealed packaging, such as toothpaste, cosmetics, ointment, jelly, jam, shoe polish, as well as pigments, lubricants, adhesives, etc.
Compared with all-aluminum hoses, aluminum foil composite hoses have many advantages: (1) 20% to 30% lighter than all-aluminum hoses of the same specification, and the amount of aluminum used per unit product is reduced by 80%, making the packaging much lighter. (2) The pipe-making process is simple, suitable for high-speed and continuous production, with less energy consumption, low cost and high production efficiency. All-aluminum toothpaste hose requires a 4-5mm aluminum plate to be punched, deburred, intermediate annealing, surface oiling agent, and round tube punching by reverse extrusion. It is inefficient, high cost, and the environmental load caused by the production process is relatively large. The composite hose only uses one pipe-making equipment to complete the pipe-making operation in one go. The aluminum-plastic composite hose material is composited using a co-extrusion process without adhesives, and is a clean production process. (3) The wall thickness of the composite hose is 2 to 3 times thicker than that of all-aluminum tubes, and the rupture strength is significantly higher than that of all-aluminum tubes, enhancing the safety of transportation and storage. (4) Because plastic is used as the inner wall material, corrosion resistance and hygiene and safety are enhanced. For corrosive contents (such as fluorine-containing paste), under the action of certain chemical substances, it will cause corrosion of all-aluminum tubes, causing penetrating holes and leakage, and aluminum ions will also enter the contents, and the mouth of all-aluminum tubes will also cause contamination when extruding the paste. Aluminum-plastic composite hoses can avoid these phenomena.
Aluminum-plastic composite blister packaging material
The aluminum-plastic blister packaging for medical and health products is also called blister eye packaging, referred to as "PTP (Pressthronghpackaging). It is made of adhesive bonding of barrier plastic blister hard sheets and aluminum foil. The blister packaging of drugs has good protection performance, fast production speed, low cost, small storage space, light weight and small transportation energy consumption; it provides patients with a single dose of drug packaging, which is both convenient and economical; because the aluminum foil of the blister packaging is printed on the aluminum foil, the distributor can avoid the occurrence of wrong drugs and mixed drugs in the distribution of various tablets. At present, my country's pharmaceutical industry has greatly increased the production of high-quality blister medicines, and it is expected that the materials used for drug blister packaging will account for about 60% to 70% of future drug tablets and capsule packaging materials.
The aluminum foil used in the packaging of pharmaceutical blisters is a sealing material (also called cover material) sealed on plastic hard sheets. It is usually called "PTP" medicinal aluminum foil. It has the advantages of non-toxic, non-corrosion, impermeability, sanitary, heat resistance, moisture resistance, etc. It is easy to disinfect and sterilize high temperatures and can block light, protecting the drug tablets from deterioration from light. Before sealing the aluminum foil cover with the plastic hard sheet, print the text pattern on a special printing and coating machine, and apply a protective agent, and apply adhesive on the other side of the aluminum foil to bond with the plastic hard sheet. The protective agent can prevent the wear of the ink text and also prevent contamination caused by the contact between the outer ink and the inner adhesive during mechanical winding of the aluminum foil.
In addition to being used in packaging of tablets and capsules, aluminum-plastic blister packaging materials will also be used in the outer packaging of injections and other drugs. They are a new packaging material with great development potential. This article comes from China Aluminum Foil Composite Materials Trading Network. Please indicate the source when reprinting.