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Good performance aluminum foil composite packaging materials are widely used in many industries

Release date:2021/03/31 Source:Xinhang Coating

Aluminum foil is not only soft in texture, good in ductility, easy to process, but also light and beautiful, easy to recycle, environmentally friendly, and is one of the most commonly used materials in modern packaging. In addition, because aluminum foil has high magnetic permeability, good magnetic absorption capacity and electromagnetic wave shielding ability, and good heat resistance, it is also often used for packaging electronic equipment and semiconductor articles.

Because aluminum foil is easy to form pinholes during packaging and use, which reduces its barrier properties, aluminum foil is often used in composite materials with paper, polymer or other metal sheets. Practice has proved that aluminum foil composite materials can greatly improve the barrier properties of packaging, improve the mechanical strength and mechanical properties of aluminum foil, and are especially suitable for making composite flexible packaging and packaging linings, which are widely used in the packaging of food, medicine, cosmetics, cigarettes and other commodities.

Aluminum foil composite paper

Utilize the moisture-proof, rust-proof, gas-barrier and corrosion resistance of aluminum foil to make it laminated with paper to form aluminum foil composite paper, or use thermoplastic film as adhesive to composite aluminum foil and paper together to form multilayer composite paper. This composite paper combines the high barrier properties of aluminum foil and the folding and impact resistance of paper materials to become a high-performance packaging material. The composite components in the materials are mostly non-toxic and odorless materials, which will not cause pollution to the contents and the human body, and are easy to meet the hygiene and safety standards of the packaging; at the same time, because the resin in it can be decomposed when heated to a high temperature, the paper and aluminum foil are separated , Thus greatly improving the recycling of materials, reducing 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 and various packaging adaptability of aluminum-plastic composite paper, it is now widely used in both industrial product packaging and food packaging. In particular, aluminum foil and paper are composited for cigarette packaging, which has accounted for 40% to 50% of aluminum foil consumption.

At present, my country is the world’s largest producer and consumer of cigarettes. Because of its high flexibility, decoration and protection, aluminum foil has basically replaced asphalt moisture-proof paper and has become the leading packaging material for cigarette packaging. The newly emerging aluminized paper gradually withdrew from the field of cigarette packaging. The inner lining layer of tobacco foil in the cigarette pack can better prevent moisture, mildew, dryness and taste. The composite of tobacco foil adopts a wet bonding process, which has better production efficiency, economy and environmental protection than dry bonding and hot melt bonding. It uses water-soluble or water-dispersible adhesives to bond aluminum foil with porous, highly hygroscopic backing paper, which eliminates a series of problems caused by the use of alum solvents in dry bonding, such as environmental pollution , Residual solvents in products, additional exhaust gas recovery and discharge devices, etc., so that the production process and products are more hygienic and safe. Its process is simple, the process is few, thinner aluminum foil and lining paper can be used, thereby reducing the amount of raw materials and energy consumption; its bonding speed is fast, the bonding fastness is high, and the manufacturing cost can be reduced. At present, wet-laid bonding has become the best production method for tobacco foil and has reached widespread promotion.

Aluminum-plastic composite tank

Aluminum-plastic composite cans are made of aluminum foil, plastic film, and kraft paper (cardboard), which can be made into square, cylindrical, rectangular, cone and other forms of packaging cans. Among them, cylindrical aluminum foil composite cans (hereinafter referred to as LFG cans) first appeared in the United States, and now many countries use this type of packaging. LFG cans are characterized by light weight and low price. They are about 20% lighter than aluminum cans, and cost about 20% lower than tinplate cans. Of course, they are cheaper than aluminum cans; they have good moisture resistance, airtightness and shading to liquid and solid contents. Performance and barrier properties, especially to avoid the pollution of the welding seam of ordinary tinplate cans; moderate stiffness, mechanical strength, high compressive strength, axial crushing force and end cap detachment force, especially suitable for the packaging of frozen food .

This composite material is also non-toxic, tasteless, and does not pollute the contents. It can be reused and recycled. Using it to replace tinplate and other thin metal cans can avoid pollution caused by metal welds and further reduce costs. And improve economic efficiency.

At present, LFG cans made of this material have been widely used in the packaging of engine oil and some crisp foods such as potato chips, and will gradually occupy new areas such as pressure vessels and cooking cans. Such as further improvement in the strength of the tank body, end cap structure, etc., and continuous improvement of the quality of the LFG tank, it can also occupy a place in the liquid packaging container.

Aluminum-plastic composite soft film

Although aluminum foil is soft and foldable, it has low mechanical strength and poor sealability. When the aluminum foil is compounded with a high-strength, heat-sealable plastic film, an aluminum-plastic composite flexible packaging material with excellent barrier properties, mechanical properties and heat-sealability can be obtained , It is widely used in food packaging, cooking bags, chemical medicine and industrial product packaging, and military supplies packaging.

For example, aluminum foil bags used as soft canned food packaging materials are composite materials with a three-layer or four-layer structure with aluminum foil as the middle layer. This kind of soft can aluminum foil bag has good mechanical properties and sealing processing performance, good moisture resistance, gas retention, good oil and corrosion resistance, non-toxic, odorless, tasteless, hygienic, safe and reliable, and convenient for printing. Automated and mechanized operations are lighter, more economical and more energy-saving than metal cans.

Aluminum foil composite cooking bag is also a widely used aluminum-plastic composite flexible packaging material. It is made of multiple layers of aluminum foil and plastic film. It is a packaging material with air tightness, high barrier properties, high flexibility and certain heat resistance. Aluminum foil composite cooking bags have the following advantages: significantly extend the shelf life of food, can withstand high-temperature sterilization treatment at 120-150°C, shelf life can reach 1.5 to 2 years, can effectively maintain the nutritional level of food, and the color and taste are not damaged. At present, aluminum-plastic composite cooking bags have been widely used in sauce-like, paste-like, solid-like cooking food packaging and space food packaging.

Aluminum-plastic composite hose packaging material

The aluminum-plastic composite material has good insulation performance, is not easy to break, beautiful appearance, bright color, clean and hygienic, easy to use, soft to the touch, and good wrinkle resistance. The hose made of this material is superior to all-aluminum hoses, and can be used as packaging materials for toothpaste, ointments, cosmetics, detergents, chemicals, paints, etc. Among them, the consumption of toothpaste packaging is the largest. With the rapid popularization of hose production lines, the cost of aluminum foil tube toothpaste has been reduced, and the utilization rate of aluminum-plastic composite materials for toothpaste packaging will increase rapidly.

The aluminum foil composite hose is made of aluminum foil, plastic or resin as the base material, and is made into an aluminum foil composite tape by a certain composite method, and then processed into a tubular semi-rigid packaging product by a special tube making machine. It is an updated product of all aluminum hoses. , Mainly used for semi-solid (paste, dew, colloid) small-volume sealed packaging, such as toothpaste, cosmetics, ointment, jelly, jam, shoe polish, pigments, lubricants, adhesives, etc.

Compared with all-aluminum hoses, aluminum-foil composite hoses have many advantages: (1) It is 20%-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 greatly lighter. (2) The pipe-making process is simple, suitable for high-speed, continuous production, with low energy consumption, low cost and high production efficiency. The all-aluminum toothpaste tube needs to go through the processes of punching wafers, deburring, intermediate annealing, surface oiling agent, and punching round tubes by back-extrusion with a 4~5mm aluminum plate, which is low in efficiency, high in cost, and the production process The environmental load caused is relatively large. However, the composite hose only uses one set of pipe-making equipment to complete the pipe-making operation at one time. The aluminum-plastic composite hose material is compounded by a co-extrusion process without adhesives, which is a clean production process. (3) The wall thickness of the composite hose is 2 to 3 times thicker than that of the all-aluminum tube, and the burst strength is also significantly higher than that of the all-aluminum tube, which enhances the safety of transportation and storage. (4) Due to the use of plastic as the inner wall material, the corrosion resistance and sanitary safety are enhanced. For corrosive contents (such as fluorine-containing paste), under the action of certain chemicals, the all-aluminum tube will corrode, causing penetrating holes and leaks, and aluminum ions will also enter the contents. The nozzle can also cause contamination when squeezing the paste. The aluminum-plastic composite hose can avoid these phenomena.

Aluminum-plastic composite blister packaging material

The aluminum-plastic blister packaging of medicines and health products is also called blister packaging, or "PTP (Pressthronghpackaging) for short. It is made of barrier plastic blister and aluminum foil bonded together. The blister packaging of medicines has good protection performance and fast production speed. , Low cost, small storage space, light weight and low energy consumption for transportation; it provides patients with one-dose drug packaging, which is convenient and economical; because the aluminum foil of the blister package is printed with text instructions, many drug distributors The distributing of these tablets can avoid the occurrence of wrong drugs and mixed drugs. At present, the pharmaceutical industry in China has greatly increased the production of high-quality blister drugs. It is expected that the materials used for drug blister packaging will account for the future pharmaceutical tablet and capsule packaging. About 60% to 70% of the material.

The aluminum foil used in pharmaceutical blister packaging is a sealing material (also called lid material) sealed on a plastic hard sheet, usually called "PTP" medicinal aluminum foil, which is non-toxic, non-corrosive, impermeable, hygienic, heat-resistant, It has the advantages of moisture-proof, easy to carry out high-temperature disinfection and sterilization, and can block light, which can protect pharmaceutical tablets from light deterioration. Before the aluminum foil cover material is sealed with the plastic hard sheet, the characters and patterns shall be printed on a special printing coating machine and coated with a protective agent. The other side of the aluminum foil shall be coated with an adhesive to bond with the plastic hard sheet. The protective agent can prevent the abrasion of the ink graphics and at the same time prevent the outer layer of the ink from contacting the inner layer of adhesive when the aluminum foil is mechanically wound and causing pollution.

The aluminum-plastic blister packaging material is used in the packaging of tablets and capsules as well as the outer packaging of drugs such as injections. It is a new type of packaging material with great development potential. This article is from the China Aluminum Foil Composite Materials Trading Network. Please indicate the source for reprinting.