Advantages and disadvantages of artificial sterili

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The advantages and disadvantages of manual sterilization and mechanical automatic sterilization in the food packaging environment

the food packaging process is the final safety control link in the food processing process. The sterilization method in the packaging environment will directly determine the good or bad of the food hygiene quality. It can be assumed that if the packaging environment contains bacteria, the food exposed in the air environment may be secondary polluted by the bacteria containing air, Make the food hygiene quality have safety hidden trouble

in the face of this possibility, this newspaper specially visited Mr. Shenyang, the technical manager of Shanghai kangjiu Disinfection Technology Co., Ltd., which is specialized in the research and development of food sterilization technology and equipment manufacturing, and discussed the sterilization methods used in the food packaging environment, so as to help more technicians of food processing enterprises choose their own sterilization methods

Professor Shen Yang said that for the food processing industry, only by effectively killing bacteria in the air environment can we ensure that food is free from secondary pollution in the production process. The so-called advantage comparison between manual sterilization and mechanical automatic sterilization is the competition between traditional and modern sterilization methods. Artificial sterilization includes: chemical spraying, formaldehyde fumigation, ozone, ultraviolet, etc; Automatic mechanical sterilization includes: Food dynamic sterilization machine, clean room dynamic sterilization components, etc. At present, medicament spraying and formaldehyde fumigation have been basically eliminated, and the rest are sterilization methods commonly used in space environment. As for which sterilization method is more effective, it cannot be clearly defined, because each has its own advantages and disadvantages. The following is a summary from the sterilization characteristics of various disinfection methods:

I. principle and advantages of ultraviolet sterilization, It causes the cross-linking rupture of nucleic acid and protein, kills the biological activity of nucleic acid, and causes the death of bacteria. The sterilization efficiency can reach 96% - 99.9%. The installation method is that the ceiling is fixed and hoisted at a height of 2 meters from the ground (1.5 meters is better), and the number of lamps installed is calculated according to 1.5W of ultraviolet lamp per cubic meter. Each irradiation lasts for more than 30 minutes. Due to the weak penetration of ultraviolet light, it is recommended to wipe the lamp tube with alcohol cotton ball before each use. Therefore, during disinfection, the workshop should be kept clean and dry to reduce dust and water mist. If the temperature is lower than 20 ℃ or higher than 40 ℃ and the relative humidity is greater than 60%, the irradiation time should be appropriately extended

the pendulum impact testing machine uses the difference between the potential energy before the pendulum impact and the residual potential energy after the impact to display on the dial. The service time of the ultraviolet lamp is inversely proportional to the irradiation intensity. Generally, the lamp tube must be replaced when the service life is not more than 1000 hours. It is recommended to equip the ultraviolet illuminometer to monitor the irradiation intensity during use, and record the service time as the basis for replacing the lamp tube. Since ultraviolet radiation is harmful to human skin and eyes, it cannot be used when there are people

II. Sterilization principle and advantages of ozone

the chemical formula of ozone is O3, which is heavier than air. Ozone is a broad-spectrum fungicide. Ozone sterilization belongs to the bacteriolytic level. It is complete and has no residue. It can kill bacterial propagators, spores, viruses, fungi, etc., and can destroy botulinum toxin. According to the introduction of Kebai Jiaobao, it has a strong killing effect on all kinds of bacteria and is also very effective in killing molds Factors affecting ozone sterilization include humidity, temperature, fresh air volume, ozone generation volume, ozone sterilization time, etc., which can simultaneously disinfect air, object surface and water

ozone disinfection does not mean sterilization when smelling odor. Generally speaking, the indoor relative humidity is 70%, the ozone concentration is 20mg/m3, the disinfection time is more than 30 minutes, and the sterilization rate is 93%-100%. The principle of ozone generation is: ionize the oxygen ion (0) in the air to viable oxygen (O3). Therefore, industrial use requires supporting oxygen generators or oxygen tubes to ensure sufficient fresh air. Ozone disinfection has toxic effect on human body, so it can not be used when there are people, and it must be shut down for 40 minutes before entering the workshop

III. sterilization principle and advantages of food dynamic sterilizer

food dynamic sterilizer is a disinfection technology widely used in recent years. It is mainly used in the packaging, cooling and filling links of food enterprises. Its sterilization principle is that the special pulse signal makes the nicoler generation chamber produce a reverse electric effect and generate a large number of sterilization factors. The whole sterilization process takes only 0.1 seconds, Keep the environment of the production workshop in a relatively sterile and dust-free state. When disinfecting the workshop, people can work in the workshop at the same time, No harm to human body Germany reprap said: "Polyurethane is suitable for special use. Therefore, the nicoler air disinfector is also called the nicoler environmental sterilization technology.

the machine is easy to use. The machine starts up when workers go to work and continues to sterilize without turning off during the process, and the workers turn off at the same time after work. According to the sterilization effect of a cake industry Co., Ltd. in Beihai from July 15 to 16, 2011, the test results are as follows: ykj-2500 food dynamic disinfector is used in a 60 square meter workshop before starting up 1281/m3, 156/m3 when the sterilizer is turned on for an hour. After 2 hours of operation, these control systems include 93/m3 of 3 closed-loop controls, which comply with enterprise standards and national standards

IV. sterilization principle and advantages of clean room dynamic sterilization components

clean room dynamic sterilization components are exclusive dynamic sterilization technologies for clean workshops. As we all know, the so-called clean room is a purification method that introduces outdoor circulating air into the room after being filtered through high-efficiency filters in junior high school. It has no sterilization function and can only reduce microbial content by controlling dust. As long as the equipment in the clean room is operated for 20 days, its micro pollution sources will appear one by one, such as bacteria breeding in the air conditioning surface cooler, bacteria breeding in the inner wall of the pipeline, bacteria spreading in the filter, etc. According to this calculation, the clean room built by the original process technology can only be dust-free, but can not be sterile

therefore, installing dynamic sterilization components in the air conditioning system and ventilation system of the clean room and starting them synchronously with the purification unit is equivalent to turning the whole clean room into a large-scale dynamic air sterilization machine, so as to achieve a true positive pressure sterile clean room. How is this dust-free sterile air formed? Its dust-free mainly depends on the circulating filtration of high-efficiency filter in junior high school; Asepsis means that dynamic sterilization components are installed in the purification unit, and the air is sterilized every time it is circulated, so that the controlled environment is always controlled in the sterilization state, without any harm to human body

to sum up, ultraviolet and ozone in artificial sterilization belong to static sterilization methods, while dynamic food sterilization and clean room dynamic sterilization components in mechanical automatic sterilization belong to dynamic sterilization measures. The four methods have advantages and disadvantages in the disinfection of processing workshops, and the combination of the four methods can just learn from each other

the comprehensive application of the four disinfection methods is described with the operation case of a large food group in Fujian: 1. In its beverage business division, the filling workshop and the inner packaging workshop have air cleanliness of 1000 and 10000 respectively. Dynamic sterilization components are included in the design, and they are started synchronously with the purification machine group during production; When it is not produced, the ultraviolet ray is used to inhibit the growth of bacteria; 2. In the baking division, after workers go to work, they use the food dynamic sterilizer to kill the bacteria in the air of the inner car room and the cooling workshop; Ultraviolet lamp is used in the packing room for continuous sterilization. When taking materials, turn off the lamp and turn on the lamp instead. After the workers leave work, ozone is used for continuous sterilization in the internal packaging workshop and cooling workshop. 3. In its agricultural products deep processing division, when cleaning all agricultural products, ozone is injected into water through silicone tubes to make ozone water for cleaning. Pesticides can be washed away without adding detergent or bactericide. Not only the cost is low, but also there is no secondary pollution to agricultural products

food safety is a systematic project, which requires the cooperation of manual sterilization and mechanical automatic sterilization to ensure the safety and health of food packaging. If we use the metaphor of white plus black cold medicine, we should use the dynamic food sterilizer and clean room dynamic sterilization components during the day; The effect of using ultraviolet and ozone at night to control the secondary pollution of food containing bacteria in the air is even better

source: printed in Central China

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