Shanghai Bilang microwave sterilization common problems and solutions.
Bilang briefly describes the common problems in the process of microwave sterilization as follows:
First, the microwave heating is uneven
1. Reasons for uneven microwave heating: microwave heating is selective. Even in the same microwave field, different food materials have different temperature rise; microwave has good penetrability, and is reflected and worn in actual heating. Through the effects of permeability, refraction, absorption, etc., even the thermal energy generated by the various parts of the same food material may have a large difference; the sharp angle concentration of the electric field, some also called the edge effect, and the microwave as a kind of electric wave, The electric field has sharp angle concentration, which is the main reason for the uneven heating of food microwaves. The electric field will concentrate in the corners, and these parts will produce more heat and heat up. In order to overcome the difficulties of the water chest effect and the hot spots, many improvements have been made on the container. For example, try to use a rounded container of the right size and a ring-shaped container. Shaping food with sharp corners. In order to overcome the limitations of microwave heating, the combination of microwave and far infrared heating methods has become a new trend in microwave oven development.
Second, the impact of microwave on the human body
From the perspective of the principle of microwave action, 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 body tissue will also heat at the same time, and the nerves in the human body are relatively small, so often the organs with low heat resistance have been damaged when the heat is not felt. If the blood vessels, eyes and testicles are vulnerable to microwaves, the common diseases of radar workers are cataracts and male infertility. The use of microwaves requires attention to safety, but it does not require as much tension as radioactivity.
Third, microwave sterilization broken bag
In the microwave sterilization operation process, in addition to not paying attention to the use of metal containers and aluminum-plated or aluminum composite bags, there is also a problem of broken bags in the sterilization process, which is not easy to solve. It is also not good to seal after sterilization. At present, microwave sterilization can be carried out before packaging or after packaging. When the packaged food is subjected to microwave heat sterilization, the pressure in the bag will be too high to swell the package bag. Therefore, the whole microwave heat sterilization process should be carried out under pressure, or the package should be placed in a pressurized glass container for treatment.
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