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All kinds of plastic packaging materials for people with a fine product packaging. At present, the plastic flexible packaging materials Print Mainly intaglio method. Gravure printing for its colorful, high-quality, widely recognized and applied, is our most common plastic packaging printing, printing the most important. 20th century 60s, plastic packaging in our country started and developed rapidly. But by the Economy Technical constraints, even today China's plastic packaging gravure printing inks used in ink or in benzene mainly insoluble. As the ink toluene, xylene, methyl ethyl ketone and other harmful solvents abound, causing a certain degree of environmental pollution, but also the health of the operator a certain degree of damage. Use of safety Environmental protection Plastic gravure ink, the production of green packaging materials is a general trend.
Benzene-soluble plastic gravure ink mainly linked material (resin), coloring, Additive And solvent composition. Which link material, coloring material and additives in the solid ink composition is about 50%. About 50% of solvent inks, commonly used solvents toluene, xylene, methyl ethyl ketone, etc.. The role of solvent is twofold: First, dissolve and disperse ink in the media all the solid ingredients, easy to ink printing on plastic film; 2 is required to adjust the printing ink drying rate of evaporation, regulate ink suitable for printing the required viscosity. Benzene-soluble ink harm lies in the following three aspects.
1 .. harm the environment Benzene-soluble plastic such as gravure printing inks containing toluene, xylene, a large number of volatile organic solvents (VOC), accounting for almost 50% of plastic gravure ink, most of these solvents are toxic and harmful substances. In the printing process, in order to reduce the viscosity of ink, often to add more solvent. These hazardous solvents in the printing process, drying the volatile emissions to the atmosphere, causing environmental pollution.
2. Harm to the operator Toluene and xylene is carcinogenic National Inventory of human skin and mucous membrane irritation large, can damage the nervous system. Therefore, as a printing operator, exposed to benzene soluble ink, its respiratory and nervous system damage is huge.
3. On packaging hazardous As ink containing toluene, xylene and other harmful solvent, if solvent evaporation during the printing process is not complete, it will lead to packaging materials in solvent residue standards. Package contents, the packaging material residues of toxic and hazardous substances will gradually move inward, eventually leading to Food And pharmaceuticals pollution, odor or deterioration.
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