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Brief introduction of flexible packaging bags composite materials

The materials of plastic packaging bags have gone through the process from traditional paper, wood, metal, glass and other materials to brand-new plastics. With the increase of commodity varieties and higher requirements for packaging, due to the limitation of the performance of single material, the development of packaging technology naturally turns to the combination of the performance and function of materials, the integration of the functions of plastics, paper and metals, and the creation of high-end and multi-functional composite packaging materials, especially soft packaging composite materials. As packaging materials, flexible packaging composites have become an important symbol of the development of modern packaging technology. Flexible packaging composite material is a flexible packaging material with a composite layer structure formed by combining two or two different materials of single-layer substrate materials (films) with lamination, extrusion, coating and other composite processes and technologies. In the packaging industry, it is mainly used for composite film bags, composite hoses, aluminum plastic composite paper cans and other packaging containers. Flexible composite packaging materials can concentrate and give full play to the unique properties of various materials – protection, aesthetics, machinability, and have excellent properties that are conducive to packaging automation, such as moisture resistance, gas resistance, shading, heat resistance, oil resistance, and heat sealing. The most common are plastic/plastic, aluminum/plastic, paper/plastic, paper/aluminum, paper/aluminum/plastic composites, etc. The number of composite layers is generally 2 to 7, and the varieties are very rich. The basic structure of various composite films is the outer layer of printing decoration, the basic layer providing strength support, the sealing layer conducive to sealing, and the functional layer with special functions (such as barrier, heat preservation, preservation, insulation, anti-corrosion, etc.). Composite packaging materials are widely used in food, medicine, light industrial products, basic chemical raw materials, electronic products and other industries. Ik’s product packaging has replaced most of the paper packaging, and some metal and glass cans have become more and more diversified with the characteristics of the commodity. According to the composite material theory and the “new packaging science system” advocated by Europe, the United States and Japan in recent years, the classification methods of flexible packaging composite materials are mainly as follows:; ② Wet coating inorganic adhesive composite flexible packaging materials; ③ Extruded film laminated composite flexible packaging materials; ④ Multi layer co extrusion (through more than two extrusion heads) composite flexible packaging materials; ⑤ Hot flux coating composite flexible packaging materials; ⑥ Solventless (i.e. solid adhesive) composite flexible packaging materials; ⑦ Physical vapor deposition composite flexible packaging materials; ⑧ Chemical vapor deposition composite flexible packaging materials; ⑨ Mixed composite flexible packaging materials; ⑩ The above method combines composite flexible packaging materials, etc. (2) According to the classification of composite materials, it is well known that the main substrate used for flexible packaging composite is plastic film, followed by paper, metal foil and composite materials. They can be used to manufacture the following kinds of composite packaging materials: ① paper and paper; ② Paper and foil; ③ Paper and plastic film; ④ Plastic film and plastic film; ⑤ Plastic film and metal foil; ⑥ Plastic film and metal film; ⑦ Plastic film and base material; ⑧ Plastic film and inorganic compound film; ⑨ Plastic film and organic compound film; ⑩ Amorphous plastic film and plastic film; ⑩ The substrate is compounded with nano ultrafine particles; ⑥ Substrate coating or; ⑩ Multilayer composite of composite materials, etc. (3) Generally speaking, soft packaging composite materials are carried out uniformly on the whole surface according to the classification of composite morphology. The composite forms of packaging materials mainly fall into the following categories: ① large area (uniform) composite; ② Local compound, such as compound strengthening or giving certain functions only at the sealing part or strengthening part of the package; ③ The composite sheet or bag integrates the special functions into a whole to play the overall function; ④ Gradual composite (or non-uniform composite): change the concentration, composition or thickness of the added materials in the thickness direction (or length direction) of the composite film as required; ⑤ Special compound, such as compound according to network pattern. Among them, ③, ④ and ⑤ are green process technologies. (4) For the packaging industry according to the classification of composite functions, because the requirements for product packaging of each industry department are different, different systems have different classifications. At present, there is no unified regulation and standardized terminology. According to the “new packaging system” advocated by Europe and the United States recently, it can be divided into the following 10 categories: ① enhanced composite packaging; ② High impermeability composite packaging (air, water and water blocking); ③ Anti corrosion (anti-corrosion) composite packaging; ④ Anti electromagnetic interference composite packaging; ⑤ Anti static composite packaging; ⑥ Biological composite packaging (fruit ripening, fish survival, pest and mold prevention); ⑦ Fresh composite packaging (for fruits, vegetables and meat products); ⑧ Composite packaging for cooking (such as cooking, microwave baking, etc.); ⑨ Intelligent composite packaging; ⑩ Ultra micro nano composite packaging. It is worth noting that there are some differences between plastic composite, plastic and paper composite, plastic, paper and aluminum foil bag composite and the above-mentioned reinforced plastic composite. The first development trend of flexible packaging composite materials is to improve the composite process, improve the properties and functions of composite materials; The second is to select appropriate materials and the best process to reduce the cost of composite materials; Third, research and development of new varieties, such as structural materials, functional materials, molecular composites, ecological composites, etc. under development.

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