Packaging design should highlight the concept of environmental protection. Packaging designers must investigate the specific requirements of the international market for environmentally friendly packaging, including the regulations of the exporting country on environmentally friendly packaging, the depth of consumer environmental protection consumption concepts, the activities of green organizations, and the development trend of environmental packaging, so that they can be fully referenced in packaging design. factor. In addition, in the packaging design, we should also consider highlighting the logo of environmental marketing. This logo is different from the environmental logo. It can be designed and planned by manufacturers, suppliers or wholesalers to represent the environmental quality of a certain product in order to achieve consumption. The goodwill of the person achieves the purpose of marketing. Strengthen technological innovation and promote the green revolution. Develop water-based inks and adhesives using a solvent-free composite process. Vigorously develop new water-based inks and adhesives that meet environmental requirements. Since water is a polar substance, according to the “similar compatibility†characteristic, organic solvents are not contained in water-based inks and adhesives, thus avoiding the pollution of volatile organic substances, improving the printing work environment and facilitating human health. Can completely eliminate the toxic and harmful substances in the solvent inks and adhesives to the human body and the pollution of the packaging products, especially for food, beverages, pharmaceuticals and other sanitary conditions require strict packaging and printing products. In addition, it is possible to avoid the potential fire hazard of igniting organic solvents due to static electricity and to reduce the residual solvent odor of packaging prints. The solvent-free compounding technology is still in its infancy in China. Most domestic composite film manufacturers use solvent-based adhesives for dry film compounding to produce thin films. Due to the use of intermediate adhesives, there is a small amount of solvent residues in the compounding process. Will cause odor inside the package, poor hygienic properties. The solvent-free compounding adhesive does not contain solvent, so the final compound bag will not contaminate the content of the packaged product due to the residual solvent; and the solvent-free compounding process flow is simple, the equipment covers a small area and energy is saved, and it will be the future development of the composite process. The main direction. Degradable plastic. Degradable material refers to a plastic whose chemical structure changes under a specific environment at a specific time. Degradable plastic packaging materials not only have the functions and characteristics of traditional plastics, but can also be decomposed and reduced in the natural environment through the action of ultraviolet rays in the sunlight or microorganisms in the soil and water after the service life is completed, and finally reinstated in a non-toxic form. Into the ecological environment. The degradable plastics are mainly divided into synthetic photodegradable plastics, photodegradable plastics and biodegradable plastics added with photosensitizers, and multi-functional degradable plastics that are combined with various degradable plastics. Domestic research and development of the varieties have included photodegradation, photobiodegradation, photo-oxygen biodegradation, high-starch content biodegradation, high-starch content biodegradation, high calcium carbonate filled photo-oxygen degradation, and biodegradation. The application of degradable plastic products in packaging has been widely used in ordinary packaging films, shrink films, shopping bags, garbage bags, etc., and can be widely used in food packaging and the packaging of some mechanical and electrical products. For example, a bulk filling material made of a mixture of starches, which is completely degradable within 13 minutes after mixing with water, can be decomposed without adding other components and does not contaminate groundwater. The filling material has the characteristics of wide application, light weight, clean, anti-static, insect-proof, free filling, and reusability. For another example, APTT's protective airbag packaging uses air as a product cushion. The inner and outer layers of the package are made of low-density polyethylene (LDPE), which can effectively prevent the package from being punctured or torn, thus prolonging the shelf life of the product on the shelf. The package is divided into antistatic surface packaging and non-antistatic surface packaging. The former is used to package electronic products that are more sensitive to static electricity. Develop edible packaging. In recent years, well-known glutinous rice paper used for candy packaging and corn baking packaging cups for packaging ice cream are typical edible packaging. The more mature synthetic packaging film is pullulan resin. The aqueous solution can be dried or hot pressed to make a film with a thickness of 10 μm, which can be used as food packaging. Recently, researchers in Wuhan developed a new type of edible inner packaging film. The film is a high-molecular substance made of glucose and has the characteristics of edible, degradable, colorless and transparent, and good oxygen barrier property. As a food packaging film, its right-angle tear strength, mechanical strength, light transmission, etc. can reach the standard of excellent film quality of plastic packaging. Develop reusable packaging materials. In Sweden and other countries, polyester PET bottles and PC bottles have been reused for more than 20 times. Wellman Holland and Holmson of the United States have recycled 100% PET containers. For example, polyester bottles can be regenerated in two ways after they are recycled. The physical method refers to the direct and thorough purification and comminution without any residual contaminants. The treated plastics are then used directly in the recycling of packaging containers; the chemical method refers to the recycled PET. After crushing and washing, depolymerizing agent such as methanol, ethylene glycol or diethylene glycol is used to depolymerize PET into monomer or partially depolymerize into oligomer under the action of basic catalyst, and then re-polymerize monomer or oligomer into Recycled PET resin packaging material. 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Soft Packaging "Green" Road
At present, China's flexible packaging and printing industry is mainly using solvent-based inks, in which large amounts of organic volatile emissions, some inorganic pigments contain lead, chromium, copper, mercury and other heavy metals, and has a certain toxicity, can not be used for printing food packaging. Among the organic solvents used, many are natural resins and synthetic resins. These solvents come into contact with the skin and can damage the body's organs and physiological functions. Ethanol, isopropanol, butanol, propanol, butanone, ethyl acetate, butyl acetate, toluene, xylene and other organic solvents are often used in printing and dry compounding processes, which are toxic and flammable, and are not conducive to environmental protection and health. Safety. Although most of the solvent can be removed by the drying system, the residual solvent will migrate into the food and endanger human health. Especially in gravure printing inks, the pigment particles are very small, and the adsorption force is very strong. Although it has been heated and dried during printing, due to short time and high speed, the drying is often incomplete, especially the larger inked area and the ink layer. Thick prints have more residual solvent. These residual solvents are brought into the dry compounding process. After compounding, it is more difficult to run away. It will slowly migrate and penetrate into the inner layer of the packaging bag and even directly contact the food, which will directly harm human health. In the flexible packaging companies in European countries, the gravure printing process basically uses water-based or alcohol-based inks. It does not use mixed solvents at all and is easy to recycle. In particular, the proportion of solvent-free compounds reached nearly 90%. Therefore, in Europe, the environmental issues of the packaging printing process have been basically solved. China's flexible packaging companies, due to raw materials, production processes, production environment and product prices and many other factors, the ink, adhesive water-based, environmentally friendly and solvent-free composite technology is difficult to promote a large area, the industrialization of China's green packaging industry slow. As a large number of flexible packaging companies, to take the "green" road, it seems that can only control the "residual" in addition to "different" to make efforts.