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The application significance of additive technology to the packaging and printing industry

in the processing and manufacturing process of plastics and inks, in addition to the matrix resin as the main raw material, it is also necessary to add some substances that can improve the use performance or processing characteristics of plastics and inks, which are additives or additives of plastics and inks. Additives include both organic and inorganic substances; There are both single substances and mixtures; There are both low molecular weight and high molecular weight. With the wide application of high-tech processing technology in plastics, packaging and ink industry, additive technology, as an important part of technological innovation in packaging and printing industry, has gradually become the focus of innovation in the industry

improve the processing and use properties of plastics

through additive technology, we can effectively improve the processing properties of plastics, mechanical properties of films (such as shrinkage, rigidity, etc.), electrical properties (such as charge mobility, antistatic), optical properties (such as gloss, haze, etc.), weather resistance (oxidation resistance, UV protection, high and low temperature adaptability) and the use properties of packaging materials. For example, in the production process of film and packaging bag, the surface performance and friction coefficient of film are important technical indicators. The friction coefficient of the film is related to the type, amount, particle size, shape, dispersion and treatment degree of additives (mainly anti adhesion agents). For example, the commonly used additives for biaxially stretched polyester films are SiO2, TiO2, CaCO3, Al2O3, MgO, etc. With the increase of the addition amount, the surface roughness of the film increases and the friction coefficient decreases. Reduce the friction coefficient of the film to a value in the range of 0.3-0.4. When printing and aluminizing, it can enhance the adhesion between ink, aluminum layer and plastic film. In order to meet the requirements of high-speed automatic filling machine, the inner surface of some packaging bags should have a certain smoothness. Usually, a certain amount of smoothing agent, such as oleic amide, is added to the inner material such as polyethylene particles to make the film smooth. Due to the poor miscibility between oleamide and polyethylene, its molecules are easy to migrate to the surface of the film, forming a weak interface layer. If the content of smoothing agent is too high, the interface layer will weaken the adhesion fastness between ink, adhesive and film surface, and affect the product quality of printing and drying process. We usually require the dynamic friction coefficient of the inner surface of polyethylene film to be in the range of 0.2-0.4. When blowing polyethylene film, adding a very small amount of low molecular fluoropolymer can effectively improve the processing and film-forming properties of linear low-density polyethylene (LLDPE) and metallocene catalyzed polyethylene (MPE), reduce the viscosity of polyethylene resin under high temperature and high die-cutting state, reduce the friction between melt and screw, barrel, die mouth (die lip), and especially significantly improve the surface quality of the film. Antistatic agent can improve the electrical properties of plastic film, strengthen the charge mobility, reduce the amount of surface electrostatic charge, facilitate the high-speed processing of plastic film during printing and compounding, and improve the efficiency of filling powder product process and the sealing strength of packaging bags. In the process of high temperature and rapid die cutting, additives are easy to produce volatile substances, which will make packaging materials smell, and the efficiency of manual sorting is low. Therefore, additives should be selected according to the requirements of the packaged products for the use of packaging materials

increase more functions of plastic materials

in polyethylene, this also makes the theory applicable to the fatigue of continuum metal materials not directly applicable to metal rubber materials. Adding tackifier to olefin resin can increase the viscosity of the film surface. Adding vapor phase antirust agent into polyethylene resin to make antirust film, which has the function of vapor phase antirust and has the effect of vapor phase antirust on the packaged metal products. In particular, adding degradation accelerators to plastic packaging materials, such as biodegradable agents, photodegradants, thermooxidative degradation agents, etc., can effectively reduce the environmental pollution caused by plastic waste

significance in ink processing and use

ink is composed of pigments, additives "Now the more popular way is PVC (polyvinyl chloride) leather blistering (or rubber vulcanization) After foaming and filling with polyether polyol and isocyanate, the organic system composed of various kinds of chemical substances with different properties, such as connecting materials, fillers and solvents, should increase the miscibility between various substances, improve the activity of pigments and fillers, and make the ink performance good. Achieve good printability, such as consistent color, good gloss, good ink film strength, friction resistance, oxidation resistance, etc. Although the amount of additives in the ink is very small, it has an important impact on the viscosity, dryness and color of the ink. There are many kinds of additives used in ink, mainly plasticizers, fast drying agents, slow drying agents, etc. The effect of binder with chemical adsorption and physical winding is more obvious in ink. The binder is conducive to the affinity between pigments, binders and fillers in the printing ink system, and improves the adhesion and mechanical strength of the ink; Reduce the ink film thickness; Prevent printing from floating color, blooming and other phenomena; Put an end to quality accidents such as cutting thread and plate pasting in the printing process; Extend the storage life of ink, etc. The antistatic agent used in the ink can improve the antistatic performance of the ink, improve the printing speed, and eliminate all kinds of printing quality problems caused by static electricity. The additives and their contents are selected according to the basic properties of the printing substrate, such as electrical properties, printability, process conditions, including the differences in ambient temperature and humidity. If the environmental humidity is high, the film is not easy to dry under the condition of high printing speed, and the film is prone to adhesion after printing, the quick drying agent should be added appropriately, and the content of oxidation accelerator in the ink should be reduced; On the contrary, if the environment is dry, slow drying agent should be added appropriately

no additive can meet all the conditions of matrix resin, process conditions, material properties, use technical requirements and so on at the same time. In actual production, it is often necessary to scientifically select and optimize the configuration of a variety of additives, so that a variety of additives can work together, which is conducive to processing and obtain relatively excellent comprehensive properties

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