Common problems and solutions of microwave sterilization in Shanghai Bilang.
1. Uneven microwave heating
1. The reason why microwave heating is not uniform: microwave heating is selective, even in the same microwave field, different food materials have differences in temperature rise; microwave has good penetration, and is reflected and The effects of penetration, refraction, absorption, etc., even if there is a big difference in the heat energy generated by each part of the same food material; the sharpness of the electric field is also called the edge effect, and microwave is a kind of electric wave. The electric field has a sharp angle concentration, which is the main reason for the uneven microwave heating of food. The electric field will be concentrated to the corners, and these parts will generate more heat and heat up faster. In order to overcome the disadvantages of water chestnut effect and hot spots, people have made many improvements on the container. For example, try to use rounded containers and ring containers of suitable size. Plastic treatment of food with sharp corners. In order to overcome the limitations of microwave heating, equipment combining microwave and far infrared heating methods has become a new trend in the development of microwave ovens.
Second, the impact of microwave on the human body
From the point of view of the action principle of microwaves, the human body also absorbs microwaves, so microwave radiation will also cause certain harm to the human body. Usually when the human body is exposed to radiation, the skin always feels hot first, so it can be avoided in time. However, when exposed to microwave radiation, due to its penetrability, the tissues in the body will also heat up at the same time, and there are fewer nerves in the human body, so often the organs with new and low heat resistance have been damaged before the burning is felt. For example, blood vessels, eyes and testicles are vulnerable to microwave damage. Common diseases of radar workers are cataracts and male infertility. The use of microwaves must be safe, but it does not need to be too nervous as radioactivity.
Three, microwave sterilization broken bag
In the process of microwave sterilization, in addition to not being able to use metal containers and aluminum-plated or aluminum composite bags, there is also the problem of broken bags sealed in the sterilization process, which is not easy to solve. It is not good to use sealing after sterilization. At present, microwave sterilization can be carried out before packaging or after packaging. When the packaged food is sterilized by microwave heating, the pressure inside the bag will swell the packaging bag, so the entire microwave sterilization process should be carried out under pressure, or the package should be placed in a pressurized glass container for processing.
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