In recent years, with the increase in population, the market demand for the packaging industry has become more and more popular. Food vacuum packaging can effectively preserve food, reduce food mildew and deterioration, is very convenient to operate and transport, and is widely welcomed by the market.
How to vacuum packaging works
The use of vacuum packaging equipment can not only discharge all the oxygen in the packaging but even discharge the oxygen stored in the food cells so that microorganisms have no conditions for survival. The removal of oxygen can prevent the spoilage of food, and it can also block gas and keep it fresh. Many foods are more suitable for vacuum inflatable packaging. Since the internal pressure after packaging is stronger than the atmospheric pressure, it can protect the food well and reduce deformation or extrusion; carbon dioxide, nitrogen, and other single gases or several mixed gases are filled into the bag. In the packaging bag, the activity of various microorganisms can be inhibited and the outside air can be prevented from entering the food bag, to better protect the food.
Vacuum packaging machinery includes electrical systems, vacuum systems, heat sealing systems, and conveyor belt systems. When working, the machine is bagged and mounted on the conveyor belt, the conveyor belt is moved forward to the working position by electrical control, then the vacuum hood is lowered, the vacuum is sealed, the vacuum pump is activated by electrical contact, a part of the air is removed from the packaging container, and the heat conduction is entered, and heat sealing.
Types of vacuum packaging
One is to vacuum the food bags or stretch film packaging boxes and then seal them, which is easy to operate and widely used at present.
The second is to vacuum the food bag or stretch film packaging box, and then fill it with mixed gas such as nitrogen or carbon dioxide to keep the air pressure inside and outside the package balanced and inhibit microbial sparks. At present, the packaging form filled with inert gas is called modified atmosphere packaging.
The third is for products with hard or cardboard bottoms, by heating the special body cover film and then vacuuming, so that the body modification mold is only attached to the surface of the product, forming the second skin effect of the product, which is the most advanced in the industry at present. Vacuum packaging technology. At present, this packaging technology is called food vacuum body packaging.
Specific applications of food vacuum packaging
In the field of food, automatic vacuum packaging machinery has many advantages, so it is widely used. At present, this equipment is not only used in the production of high-temperature and flexible packaged food but also in the packaging process of light meal packaging and many quick-frozen foods. Due to the differences in vacuum packaging for different foods, generally speaking, the vacuum degree of most foods only needs to meet above 94°, and with the help of automated packaging, the vacuum degree can reach 97° or even higher. When sealing food packaging, special attention should be paid. On the one hand, when packaging light meals, there may be moisture and soup ingredients, and the packaging machinery needs to be adjusted; Freeze. In addition, for the vacuum packaging of vegetables, soy products, and other products, the vacuum packaging machine should be reasonably selected according to the specific conditions of the food and the different needs of customers. In the specific packaging process, the film needs to be heat-treated and then put into the corresponding items. Since the film has the advantages of good quality, high-temperature resistance and good transparency, there are no restrictions on the packaged food.
