Analysis of Gravure Ink for New Environmentally-friendly Flexible Packaging

Since the 1980s, China's plastic flexible packaging industry has developed rapidly, and has promoted the continuous upgrading of food, daily chemical and pharmaceutical packaging. The intensification of the industrialization process has brought about more environmental problems. Governments in various countries have formulated policies that require better protection of the environment and natural resources when developing the economy. People's growing awareness of environmental protection, health and safety, prompted us to more stringent requirements for plastic flexible packaging, especially the requirements of the health and safety indicators, such as solvent toxicity, residual solvent, heavy metal content and other indicators.

Although the gravure packaging gravure printing industry provides people with various functional packaging bags, it also brings serious environmental negative effects due to the volatilization of large amounts of organic solvents. At present, in China's flexible packaging gravure printing inks and dry composite adhesives, volatile organic solvents such as aromatic hydrocarbons and ester ketones are widely used. People in the printing industry generally believe that only by improving the environmental pollution in the gravure printing process can we ensure long-term The further development of gravure printing industry will face the possibility of elimination.

In the future, water-based plastic inks will certainly replace organic solvents that are currently used. However, in view of the characteristics of water-based inks and the state of the existing printing machinery and equipment in China, the promotion of large-scale water-based inks on plastic flexible packaging still needs time. Water-based inks use water as a solvent carrier and have a slower rate of volatilization. This requires the printer to have a stronger drying capacity, blowing and exhausting capacity, and due to the chemical action of water, the components that touch the water in the printing machinery need higher resistance. Corrosion, anti-rust performance, such as roller, scraper, ink pump and so on. Therefore, compared to the current toluene-based inks, alcohol-soluble inks are easily accepted by the environment, solving the environmental damage caused by the use of toluene and harm to human health, and due to the high boiling point of aromatic hydrocarbons, easy Retention causes the printed matter to have many residual solvents, odors, and the actual printing problems that affect the contents of the package.

New alcohol printing ink

At present, the well-known manufacturers in the food industry are optimistic about the beverage and liquid milk markets and successively launch related production lines. However, the cost of paper-plastic compound brick packaging is still high, and it cannot meet the needs of fast-food and popular liquid milk packaging development. Under the pressure of competition, food companies began to focus on the decline in the cost of related auxiliary materials. The packaging of milk and other contents using a PE co-extruded film as a substrate not only achieves a shelf life of 7 to 30 days, but also significantly reduces the cost of packaging. It is against this background that the liquid flexible packaging has grown rapidly and has driven the rapid development of printing ink for printing liquid packaging. In the market of plastic intaglio printing inks, most of them are polyamides or modified as binders. This type of ink is used for polyethylene film, and the ink layer has good fastness and good gloss; but polyamides The inks generally have poor water resistance, are not resistant to grease, and are not resistant to freezing and other performance defects. The use of this type of ink for high-temperature printing in the summer is apt to produce stickiness and softening, and freezing occurs during low-temperature printing in winter. Liquid packaging in the process of filling, circulation, storage and other post-processing, through high-temperature sterilization, or freezing and other processes, therefore, the inherent defects of polyamide printing ink can not meet the liquid packaging requirements. Chao Lifu 313A ink uses polyester (modification) as the linking material, has the alcohol-soluble, water-resistant, boil-resistant, anti-hydrogen peroxide bactericidal characteristics, fundamentally improved the defects of polyamide printing ink and eliminated the packaging bag Content pollution factors ensure food hygiene and flavor. The ink is mainly used for high pressure polyethylene film, such as liquid packaging, export daily necessities outer packaging. At the same time can be used for BOPP (heat seal) table printing, making high-demand biscuit packaging. In addition, because of its excellent high temperature resistance, it has been successfully used in beverage packaging for Tetra Structures.

New alcohol soluble composite ink

When the packaging bag is printed, the ink or solvent used contains toluene. Because the boiling point of toluene is 110°C or more, it is impossible to completely evaporate during the printing and compounding process. Therefore, the odor may remain in the packaging bag. In the past, color printing manufacturers that specialize in producing milk powder packaging used a lot of financial and material resources to control the odor problems of packaging bags, such as the introduction of high-speed machines and the use of fast-drying solvents, but they still could not fundamentally eliminate the problem of solvent residues. Chao Lifu 303LV alcohol-soluble compound ink is developed for pharmaceuticals, high-grade puffed foods and other packaging requirements without odor residues and is mainly used for PET film, NY film composite in India, packaging structure such as PET / / AL (aluminum ) / / PE, PET (NY) / / PE and other drugs, puffed food packaging. The ink does not contain benzene solvents. The alcohol ester solvent is used as a diluent. The release of the solvent from the resin is good. The residual solvent is very low after printing. The specific test parameters are shown in Table III and Table IV.

In the use of 303LV ink can be used alcohol-soluble or ester-soluble adhesives, the composite strength of both adhesives can meet the actual requirements of the use of bags. However, alcohol-soluble compound inks are best used with alcohol-soluble glues to achieve the best composite strength, while ensuring that the solvent residues in the bags are kept to a minimum. If an ester-soluble polyurethane adhesive is used, it may bring The residue of ethyl ester. Through the composite of different adhesives, the composite strength test of 303LVI ink is shown in Table 5.

Environmental inks are the only way to achieve green printing. Alcohol-soluble and water-based inks can significantly reduce environmental pollution, protect the health of printing workers, and promote the development of printing to non-toxic operations. China has now begun to formulate relevant packaging regulations, so that the health and safety of food packaging requirements and international standards.

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