Food packing materials

Abstract

The invention provides food packing materials. The food packing materials sequentially comprise an outer layer, parts formed after printing ink processing, non-solvent adhesives, parts formed after high-barrier processing and inner layers from top to bottom. The outer layer serves as a printing base material; patterns are printed on the inner face of the outer layer through printing ink; high-barrier processing is carried out, namely, space between the outer layer and the inner layers is coated with materials to form an isolation structure, and the outer layer is combined with one inner layer through the non-solvent adhesives. Hereby, the non-solvent adhesives will not lead to thermal expansion and pattern deformation (Pitch) of the food packing materials in the high-temperature drying and fitting process, fitting processing speed is three times the traditional speed, the non-solvent adhesives prevent residual solvents from polluting contents or generating foreign smells, and accordingly the packing materials which are free of pollution or toxicities and environmentally friendly are generated.

Description

【Technical field】 [0001] The present invention is related to the printing method of packaging materials, especially the non-polluting printing method is to use water-based printing ink that is non-toxic and does not contain eight heavy metals (arsenic, cadmium, chromium, mercury, nickel, lead, zinc and copper). Solvent-free adhesive is used for adhesion, and the use of solvent-free adhesive will not cause thermal expansion and contraction and pattern deformation (Pitch) when food packaging materials are laminated under high-temperature drying; its lamination processing speed is two times faster than traditional ones. times, the solvent-free adhesive avoids residual solvents from contaminating the content (as shown in Annex 1) or causing peculiar smell, and does not harm the human body at all, or isolates harmful substances with a mandatory isolation structure, which is an environmentally friendly, non-toxic, and non-polluting product. A food packaging material. 【Background t...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of fast food items, it is convenient for people to eat easily. The amount of instant noodles (instant noodles) is increasing, and instant noodles are packaged with plastic film. Regarding food packaged with plastic film, there are biscuits, candies, noodles, The used plastic packaging bags, snacks, etc., because the inner surface of these plastic films must be printed with words and patterns such as product names, trademark brands, product sources, ingredients, etc., and the colors are bright, especially the golden patterns are not included in traditional inks. Copper or zinc accounts for 60-80% and also contains other heavy metals, seriously polluting the environment

like figure 1 As shown, the plastic film mainly contains an outer layer of OPP polypropylene (Orient polypropylene extended by alignment), and the pattern is printed on the inner surface of the OPP polypropylene layer. The printing is printed with organic solvent-based ink (Solvent Base Ink) On the inner surface of the OPP polypropylene layer, an organic solvent-based adhesive (Solvent Base Dry Lami nation) is used to adhere an inner layer of VM-CPP polypropylene [Vacuum Metalized-Cast polypropylene vacuum evaporation aluminum plating, non-alignment extension (extensible) Polypropylene], although there is an outer layer of OPP polypropylene and an inner layer of VM-CPP as isolation organic solvent ink SB-Ink and organic solvent adhesive SB-DL, but after a long time, the organic solvent ink SB-Ink And organic solvent-based adhesive SB-DL internal poisons will volatilize and affect the human body;

[0003] As shown in Appendix 2, it is the test of the above-mentioned packaging materials by the Institute of Food Industry Development. The special gas transmission rate is 13.79, and the gas in this test is toluene; these organic solvent-based inks SB-Ink and / or organic solvent-based adhesives The hazards of SB-DL to human health are becoming more and more obvious, and people may become victims of ink pollution. The most important pollutants (inks, adhesives) in printing OPP polypropylene often use ethanol, isopropanol, and butyl alcohol. Alcohol, propanol, methyl ethyl ketone, ethyl acetate, butyl acetate, toluene, xylene and other organic solvents, although these organic solvents are used in dry lamination, but the above-mentioned pollutants will remain and cause harm to the human body. If it is a printed plastic film with a large printing area and a thick ink layer, there will be more residual solvents, and the toxic substances released during use will pollute the air and endanger people's health. The diluent containing toluene is toxic. It has a strong pungent smell. After infiltrating into food, it is reported that long-term consumption will cause cancer and affect the central nervous system of the brain, causing great harm to human health;

[0004] At present, the gravure printing ink in the plastic film of Caiyi packaging in Taiwan, China is generally made of chlorinated polymers and contains a large amount of organic solvents (accounting for about 50%). Among them, solvents such as toluene, ethyl acetate, and butanone have low boiling points and high volatility. Aromatic hydrocarbons are both toxic and flammable, and traditional inks have been used in the color art industry for a long time. With the development of information and customers' requirements for aesthetics, large areas of golden patterns are often designed on art patterns, and these patterns The main components of the golden ink that must be used are heavy metals such as copper or zinc (as shown in Annex 3). These organic solvents and heavy metals are not only easy to remain on the packaging materials, but also are discharged into the environment due to the uncontrollable pollution of the process, causing air, Water and soil pollution, and once farmland soil is polluted by heavy metals will seriously endanger the growth of crops, excessive heavy metals will be absorbed by crops and accumulate in plants, and crops containing heavy metals will affect the safety of human food through the food chain. In terms of the historical background of heavy metal pollution in rivers and rivers in Taiwan, in 1990, the Environmental Protection Agency monitored the case of Erren River in the south. At that time, regardless of its downstream or tributaries, the river itself and its sediment were seriously polluted by heavy metals. Among them, copper, zinc and lead are the main pollution sources, and their content is 20-40 times higher than that in unpolluted areas. These heavy metals may enter the food chain directly or indirectly, causing human beings and other organisms to absorb and accumulate to cause toxicity. , which is called biomagnification

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