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The raw materials and material structure required for the production of composite membrane materials, mainly polypropylene, polyethylene, polyester, polyester aluminum, aluminum foil, etc., these materials are still the main raw material for composite film production. It will continue to be used for a long time. Since composite films and bags made of these raw materials are disposable consumer products, they can rarely be recycled, so people try to replace them with biodegradable plastic films with equivalent properties. It is worth noting that as people pay more and more attention to environmental protection, paper is increasingly used in the production of composite membranes. The composite film of paper/current layer/aluminum foil/current layer/PE structure will become more and more popular.
In short, in the next 5-10 years, there will be no revolutionary change in the production of composite membranes in terms of process and raw materials. For manufacturers, they should strive to improve their own quality and improve product quality while paying full attention to environmental protection issues. Grade, improve their own management level. To meet the increasingly international market competition.
After years of development, the production process of composite membranes has been relatively complete. Therefore, there will not be major changes in the near future. As the existing production process of the composite membrane is more or less accompanied by the generation of waste, it is necessary to make some changes in the production process to meet the needs of environmental protection. (1) In the process of plastic gravure printing, benzene-free ink is used instead of current benzene-based inks. At present, although many domestic manufacturers have introduced benzene-free inks, their performance has not yet fully satisfied the needs of plastic printing, and they are expensive. The unit price is 2 to 4 times that of ordinary inks, which is not conducive to reducing the printing cost. Therefore, benzene-free ink will replace ordinary ink. Companies should install exhaust gas treatment devices to reduce the emission of organics (especially benzene) during the printing process. (2) In the dry compounding process, the solvent used is ethyl acetate. Although the "Emission Standards for Integrated Air Pollutants Emission" (G816297-1996) does not specify the emission of ethyl acetate gas, the gas has harmful effects on the human respiratory tract and should be used as little as possible. Ethanol-soluble adhesives have been developed that can replace polyurethane adhesives with ethyl acetate as a solvent. The adhesive is alcohol-based, non-polluting, and not costly. It will be widely used.
January 26, 2019