Shelf life of food stretch film packaging machine
Stretch film packaging food in the end how long, how many days of shelf life?With this question I searched on the Internet, combined with the simple product knowledge I know, write down the following text!
Food stretch film packaging machine in plastics aluminum foil or plastic film for packaging materials, the raw meat, cooked food, solid, grain, fruit, pickles, preserved fruit, medical products, medicine, electronics, instruments, rare metal vacuum packaging, such as packaged goods can prevent oxidation, mildew, bug eat by moth, decay, be affected with damp be affected with damp, with good quality fresh longer.Especially suitable for tea, food, medicine and other industries, with beautiful appearance, compact structure, high efficiency, simple operation and other advantages.
Food stretch film packaging machine maintenance period, which is a difficult and difficult to answer the question, and the type of food and food packaging before pretreatment.Different kinds of food, or different pre-treatment process, after packaging at room temperature storage time is not the same.For example: as a rule of thumb, if food is kept at room temperature for two days, it should be fresh farm produce or slightly processed meat products. If these are vacuum-packed, they can be extended to six days, and some can be extended to 18 days.Cooked foods are shorter and dried fruits last longer, even longer than 12 months.Experiments should be done for specific products.Vacuum packing in under the condition of normal temperature, how long can be saved, it needs to see under the condition of vacuum, excessive microbes and so on, because there are some microbes is anaerobic, the shelf life of fresh kind, is generally based on the chemical and biological characteristics to formulate, in addition, the fresh class rarely preserved at room temperature, are generally refrigerated or frozen.
Food stretch film packaging is the main function of oxygen, to help prevent food spoilage, its principle is simple, because food metamorphism causing mold mainly caused by the activity of microorganism, and the survival of most microorganisms (e.g., mold and yeast) is need oxygen, and vacuum packing is using this principle, the packaging and food within the cell oxygen smoke, lose microbial survival environment.Experiments show that when the oxygen concentration in the package is less than or equal to 1%, the growth and reproduction rate of microorganisms will drop sharply, and when the oxygen concentration is less than or equal to 0.5%, most microorganisms will be inhibited and stop reproducing.(note: vacuum packaging cannot inhibit the reproduction of anaerobic microorganisms and the deterioration and discoloration of food caused by enzyme reactions, so it should be combined with other auxiliary methods, such as refrigeration, quick-freezing, dehydration, high-temperature cooking, irradiation, microwave, salting, etc.).
Vacuum deaeration besides inhibiting microbial growth and reproduction, another important function is to prevent the oxidation of the food, because the oil kind food contains A lot of unsaturated fatty acid, by the effect of oxygen oxidation, sour food, deterioration, in addition, the oxidation also make vitamin A and C loss, volatile substances in food pigment by the role of oxygen, make the color darker.So, deoxygenation keeps food from spoiling.
Stretch film packaging machine in addition to the vacuum function, there is a vacuum inflatable function, vacuum inflatable packaging in addition to the vacuum packaging in addition to the oxygen quality function, the main pressure resistance, gas resistance, preservation and other functions, but also can make food to maintain the original color, aroma, taste, shape and nutritional value for a long time.Because the production process is different, the maintenance period will be different, later we can continue to discuss!