Compared with traditional materials, composite bags materials have the following characteristics: 1. Designability. The physical and chemical properties of composite bags materials, such as sound, light, heat, force, electricity, anti-corrosion, anti-oxidation, etc., can be made into materials with different properties according to different purposes. Composite packaging bag, aluminum foil bag, plastic packaging bag 2. The unity of material and structure. The component molding of traditional materials is reprocessing of the material, and the components and chemical changes of the material do not occur during the reprocessing process, while the composite material component and the material are formed at the same time, generally no longer processed from “composite bags materials” into composite material components. . Due to this feature of composite bags materials, the integrity of the structure is good, and the number of parts and connections can be greatly reduced, thereby shortening the processing cycle, reducing costs, and improving the reliability of components. 3. Take advantage of compound effects. Although the composite material is formed by the composite process of each component material, it is not a simple mixture of several materials, but a new performance is formed on the basis of the raw materials. 4. The dependence of material properties on the composite process. In the process of forming the composite material structure, there are physical and chemical changes of the component materials. The process is very complicated. The performance of the component is highly dependent on the process method, process parameters, and process. At the same time, it is difficult to accurately control the molding process. process parameters. The advantages of composite bags materials: 1. High strength and large modulus. composite bags materials are “lightweight and high-strength”. For example, carbon fiber reinforced epoxy resin composites have a strength ratio of 5 times that of steel, 4 times that of aluminum alloys, 3.5 times that of titanium alloys, and 4 times the modulus of steel, aluminum, and titanium. . 2. Good damping and vibration reduction. The interface of the composite material has a greater ability to absorb vibration energy, resulting in a higher vibration damping of the material. 3. High security. The damage of composite bags materials is not as sudden as traditional materials, but after a series of processing processes such as damage, cracking, interface debonding, fiber fracture, etc., which delays the sudden occurrence of damage and improves safety. Classification of composite bags materials (1) According to different performance, it is divided into: structural composite bags materials and functional composite bags materials. (2) According to the type of matrix material, it is divided into: resin matrix composite material, metal matrix composite material, inorganic non-metal matrix composite material. (3) According to the form of dispersed phase, it is divided into: continuous fiber reinforced composite material, fiber fabric, braided reinforced composite material, sheet material reinforced composite material, short fiber or whisker reinforced composite material, particle reinforced composite material. (4) According to the category of reinforcing fibers, it is divided into: carbon fiber composite bags materials, glass fiber composite bags materials, organic fiber composite bags materials, and ceramic fiber composite bags materials. Composite material performance Composite principle Composite material is composed of two or two materials with different chemical components and different properties. What method do they follow to composite, and how can the overall performance of the composite be better than that of the composite material? Sub-material is to retain the desired properties (such as high strength, high rigidity, light weight), and suppress the properties that are never expected. The composite principle is to discuss this issue, and the relevant issues are briefly introduced above. (1) Interaction between the matrix and the reinforcing material The interaction between the matrix and the reinforcing material in the composite material is manifested through the properties and strength of the interface formed. Generally speaking, the interface is not only the geometrical structure of the two materials. The interface, so it is an interface layer with a certain thickness, changes sharply in this area, and there are various complex physical, chemical and mechanical effects. Therefore, in the actual composite material, the combination between the matrix and the reinforcing material can be divided into the following types. Mechanical bonding. There is no chemical reaction between the matrix and the reinforcing material, and it is purely a mechanical connection. This combination is achieved by the friction between the rough fiber surface and the matrix, and can only bear the load parallel to the direction of the fiber. Wetting and Diffusion. During the composite process, the liquid cluster spreads and wets the surface of the reinforcing material, and then the mutual atoms or molecules diffuse and penetrate to form the interface. Reaction binding. A chemical reaction occurs between the matrix and the reinforcing material, and they are mixed and combined at the interface. The combination of several of the above combination methods is the most common combination method. (2) Compatibility between the matrix and the reinforcing material Compatibility refers to the degree of coordination and cooperation between the various components of the composite material in the process of manufacture and use. It is related to whether each component material can effectively play a role, and also related to whether the overall structure and performance of the composite material are lasting and stable for many years. Physical compatibility: Physical compatibility requires that when the composite material is subjected to stress and environmental temperature changes, the mechanical properties of each phase component material and other physical properties can be coordinated and matched with each other. Among them, the importance of mechanical compatibility means that the matrix should have sufficient toughness and strength, and can transfer the internal load to the reinforcing material uniformly, so that there will never be an obvious discontinuous phenomenon; thermal compatibility is a physical phase. Another content of capacitance, the composite material requires that the matrix and the reinforcing material have a comparable thermal expansion coefficient and a reasonable expansion coefficient (sometimes thermal conductivity needs to be considered), so as not to be exposed to high temperature or cyclically heated, the exterior of the composite material will not be damaged. Detrimental additional stress is generated thereby impairing its mechanical properties. Chemical Compatibility: Chemical compatibility is quite complex, it includes thermodynamic compatibility and chemical reaction (reaction between matrix and reinforcement) compatibility. It is precisely because of the ultra-high-performance chemical stability of composite bags materials that composite packaging bags have been widely used in various industries, including food, daily necessities, cosmetics, industrial products, stationery, etc.