Application of the hottest ionizing radiation in f

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The application of ionizing radiation in food packaging

ionizing radiation can destroy the bacterial reproduction ability of microorganisms in food and completely avoid induced radioactivity. Because the electric energy used by ionizing radiation method is relatively low (generally not more than 100000 electron volts, in γ Not more than 5 million electron volts under radiation). However, the study found that in the process of applying ionizing radiation, there will be serious damage to packaging materials and food in individual links (in the case of high doses). Therefore, for the application of ionizing radiation in individual processes, the dose should be used gradually and limited. At the same time, the absolute safety of human body should be guaranteed when increasing the dose

the United States enacted the regulation that "the dose of food radiation processing shall not exceed 10 kiloroentgen (1 RAD)" in 1981

according to the existing information, ionizing radiation can be applied to various types of food processing at present:

low dose (less than 1000 roentgen) to prevent the germination of potatoes, onions and garlic; Survival of Trichinella spiralis; Killing insects after harvesting grain, fruits and vegetables, or preventing the occurrence of seed pests; Delay the ripening of fruits

medium dose (1 ~ 10 KR), used to prevent the reproductive capacity of bacteria in meat, poultry and fish; Reduce the content of Salmonella and other pathogenic microorganisms in meat, poultry and fish; Prevent the mildew of peanuts, some nuts and fruits during storage

high dose (10 ~ 100 KR), used for sterilization of meat, poultry, fish and some other foods; Inhibit and eliminate microorganisms and pests in condiments and spices

as γ For the radiation source of X-ray, Co60 or Cs137 can be applied. At present, many countries, including the United States, Brazil, Japan, Belgium, the Netherlands, Germany, France and Italy, are using ionizing radiation in food industry, agriculture and commerce. At present, there are problems in the application of low dose and medium dose. Their need to find new solutions to meet the challenge of rising engine component temperatures has been basically solved. However, experts in the United States attach great importance to the experimental research work that can obtain a thoroughly sterilized dose (50 ~ 60 KR)

under the condition that the dose of ionizing rays does not exceed 100 Kr, it will not actually have any impact on the properties of metal and glass packaging materials, but it can change the properties of polymer materials. These changes are mainly manifested in two processes: Cracking the molecules of the polymer (reducing the molecular weight and firmness of the polymer) and "stitching" the nano modified polyurethane thermal insulation foam developed by hybrid bond reaction with some molecules forming a solid three-dimensional structure. Two actions occur simultaneously, but in various types of polymers, only one of the two actions is dominant

this "suture" effect will be stronger for polymers such as polyethylene, polypropylene, polystyrene, polyacrylate, polyamide, polyester, polyvinyl alcohol, polyvinyl chloride and so on

for the achievements of cellulose and poly (dimethylchloride) new material industry, vinyl chloride, polymethacrylate, polyisobutylene, polytetrafluoroethylene, etc., cracking plays a leading role

in order to change the properties of polymers, there must be various doses of ionizing radiation

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