At present, rice vacuum packaging bags in China mainly use plastic woven bags and composite plastic bags as packaging containers, and some problems in these vacuum packaging bags in transportation, loading and unloading, and retail have been solved. The use of plastic woven bags to pack rice will cause serious waste. Generally, it can only be used 1-2 times, and the relative cost is also high. The package is simple to open and difficult to reseal, which is not conducive to long-term storage. Pests and mildew in woven bag packaging are also more serious. The packaging material has poor moisture resistance, poor barrier properties, and food is susceptible to oxidative mildew.
Plastic composite bags are compounded by highly barrier packaging materials. To a certain extent, it solves the problems of mold and insect resistance and freshness of rice, but the post-processing is difficult. Such packaging materials are not easy to degrade, which is not good for current The development of environmental protection concepts is subject to certain restrictions.
At present, there are basically two types of packaging in the market. One is ordinary packaging. Rice is packed in polypropylene plastic woven bags. No fresh-keeping technology is applied during the packaging process. poor effect. Another is to use vacuum packaging technology to evacuate the vacuum packaging bag. The vacuum technology has a good preservation effect on the storage of rice, but the selection of the shape and vacuum of the rice itself is not suitable. At present, rice is vacuum packed. The selected vacuum degree is generally between -0.07 and -0.09kPa. As long as the vacuum degree is within the range, the factory is a qualified product.
For fresh-keeping packaging of rice, it must be combined with the circulation environment, so as to ensure that the product has a better quality preservation effect and can better protect the rice product.