This year, with the continuous improvement of people’s consumption level, the high-quality rice market as a staple food has achieved rapid development. In the context of the continuous enrichment of rice brands, the continuous upgrading of product series and the continuous improvement of product grades, rice packaging materials are also constantly innovating and developing. In particular, rice composite packaging bags have achieved significant development.Rice packaging has developed from the simplest woven bag packaging to the present, and has made great progress in packaging materials, printing processes, and composite processes. While ensuring packaging performance, it has shown a green development trend. 1, changes in printing methodsfrom90From the 1990s to the present, the rice packaging form has grown from the woven bag to the present, with woven bags, plastic composite bags, and non-woven packaging. The corresponding printing method has also developed from the original single letterpress printing to the coexistence of letterpress and gravure printing. Compared with the original woven bag packaging and printing effect, the gravure printing of plastic flexible packaging has high production efficiency, accurate color registration of printing patterns, exquisite patterns, and better shelf effect. And improve the product grade. With the passage of time, flexographic printing, which is energy-saving, environmentally friendly and hygienic, has also begun to be applied in the rice packaging bag industry. 2, the change of compound wayAs the society has higher and higher requirements for the hygiene and safety of product packaging, rice packaging bags are no longer just dry compounding, and environmentally friendly solvent-free compounding has been used more and more. Used when compounding without solvent100%The solid solvent-free adhesive and special compounding equipment make the film substrates stick to each other, and then after the chemical reaction of the adhesive is cured, the various layers of substrates are bonded together. The method of compounding two substrates together on a solvent-free compounding machine is also called reactive compounding. Since solvent-free composites are all solvent-free polyurethane adhesives, there are two-component and one-component adhesives, and the solid content is100%, so solvent-free compounding and dry compounding have the same physical and mechanical properties of the material, but have more food safety and environmental protection advantages than dry compounding. 3, using visual aluminum plating processIn order to meet consumers’ visual requirements for products, the visual aluminization process continues to develop and mature under the requirements of the market. There are two types of visual aluminizing process: half-side aluminizing process and aluminum washing process. Both of these two processes are to obtain local aluminization effect and local visualization window, and the difference is that the process method is different. The process method of half-side aluminizing is to improve the process in the thin-film aluminizing process, which will require evaporationALThe position of the layer is empty, and the aluminized layout does not need to be protected by a mold, so that an aluminized film with both a transparent part and an aluminized part is formed, and then the required materials are compounded to form a composite film. The process of washing the aluminum composite packaging film removes the aluminum in some areas, and then composites with other substrates. Both of these two processes have been used in the existing high-end rice packaging bags, which have greatly improved the product quality. Get a good shelf effect. 4, using local extinction processUnder the circumstance that the differentiation of the rice market continues to expand, the partial matting process has also been used in the rice composite flexible packaging. The process is characterized by the use of partial matte oil to achieve the visual effect of the packaging. Rice on the market uses this process technology to improve product quality.
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