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Methods for removing harmful solvents from residual plastic flexible packaging materials

release date: Source: Huicong plastic editor: China Packaging browsing times: 522 copyright and disclaimer

core tip: in the process of making flexible packaging materials, you should be exposed to a variety of organic solvents, including toluene, ethyl acetate, acetone, butanone, isopropanol, methanol to improve vehicle performance, etc., which come from inks and adhesives

[China Packaging News] in the process of making flexible packaging materials, we need to contact a variety of organic solvents, including toluene, ethyl acetate, acetone, butanone, isopropanol, methanol, etc. these solvents come from inks and adhesives

for polyethylene and polypropylene films, toluene and ethyl acetate are good solvents for polyolefins (solubility parameters are similar), that is, polyolefins have a great intermolecular force with toluene and ethyl acetate, even if the printed film is at 1 The power supply and oil source of the experimental machine must be accurate according to the regulations. In the drying channel, these organic solvents are also difficult to desorb from the polyolefin film, causing toluene and ethyl acetate residues in the packaging materials to exceed the standard, causing food pollution and endangering people's health, specifically

in order to reduce residual organic solvents such as toluene when making flexible packaging bags, Shenzhen Huale plastic products Co., Ltd. usually adopts the methods of increasing the oven temperature and air volume during the preparation of composite films, and also adopts the method of placing in the curing room, and sometimes even adopts the method of rewinding many times. But these methods to reduce solvent residues are passive

foreign countries have developed flexible packaging materials with low adsorption properties for solvents, but the research in this field in China is blank. If we change the polarity of polyolefin resin, such as adding a small amount of high polarity additives (nano modifiers), improving the solubility parameters of polyolefin and increasing the difference between the solubility parameters of resin raw materials and toluene and ethyl acetate solvents, the force between polyolefin and solvent molecules will be reduced, and the organic solvent cannot enter the deep layer of polyolefin film, The solvent adsorbed on the surface of the film can be easily removed in the oven

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