1. The ever-changing printing: From the 1990s to the present, rice packaging has grown from a woven bag to a woven bag, a color printing vacuum bag, and a non-woven packaging. The corresponding printing method has also evolved from the original single letterpress printing to the coexistence of letterpress and gravure printing. Compared with the original woven bag packaging printing effect, the plastic flexible packaging gravure printing has high production efficiency, accurate printing pattern, beautiful patterns and better shelf effect. And improve the product grade. As time goes by, flexo printing, which is energy-saving, environmentally friendly and hygienic, has also begun to be applied in the rice vacuum packaging bag industry.
2. the continuous change of the composite: With the increasing hygiene requirements of the society for product packaging, rice vacuum packaging bags are no longer just dry composite, environmentally friendly solvent-free compounding is getting more and more applications. In the solventless compounding, a 100% solid solvent-free adhesive and a composite device are used to bond the film-like substrates to each other, and then the chemical reaction of the adhesive is matured to bond the substrates together. Composite mode. A method of compounding two substrates together on a solventless laminating machine, which is also called reactive type compounding. Since solvent-free composites use solvent-free polyurethane adhesives with two-component and one-component adhesives with a solid content of 100%, solvent-free composites and dry composites have the same physical and mechanical properties. However, it has the advantage of food and environmental protection than dry compounding.