Microwave pest killing method for grain products such as rice, beans, wheat

Abstract

The invention discloses a microwave pest killing method for grain products such as rice, beans, wheat and the like for grain raw material or processed grain, which is applicable to the grain products before being put in storage or taken out of storage. The microwave pest killing method for grain comprises the following steps: (1) quantitatively putting the grain product into a pored packing bag or nonmetal container; (2) uniformly heating to 40-70 DEG C in a box-type or tunnel-type industrial microwave oven; (3) setting temperature to 50-70 DEG C in a tunnel-type thermal insulation oven, and keeping the temperature for 3-15 minutes; (4) slowly reducing the temperature of the container or the packing bag to below 40 DEG C in a cooling channel in a cold air environment; and (5) storing the product or selling at retail. The method disclosed by the invention is a pure physical pest killing technology, and can completely kill the adults, larvae and eggs in the grains of rice and beans while maintaining the original quality and flavor of the grain products such as rice, beans, wheat and the like.

Description

technical field [0001] The invention relates to a method for killing insects in grain products such as various grains, in particular to a method for killing adults, larvae and worm eggs in grain products such as rice, beans, wheat, etc. in grains by using a microwave method. Background technique [0002] Worldwide, insect pests in various grain products such as rice, beans, and wheat in grains have always been difficult problems for grain storage and processing personnel to solve by physical methods. Due to the lack of effective technology and equipment, rice, beans, wheat, etc. Pest problems in grains such as beans and wheat generally rely on drug fumigation techniques such as phosphine (or aluminum phosphide), which can kill adults and larvae, but cannot completely kill the eggs parasitic in grain particles. During the storage and sales shelf life, under the right temperature and humidity conditions, the eggs will hatch; after the process of excessive use of chemical drugs...

AI Technical Summary

Problems solved by technology

[0002] Worldwide, insect pests in various grain products such as rice, beans, and wheat in grains have always been difficult problems for grain storage and processing personnel to solve by physical methods. Due to the lack of effective technology and equipment, rice, beans, wheat, etc. Pest problems in grains such as beans and wheat generally rely on drug fumigation techniques such as phosphine (or aluminum phosphide), which can kill adults and larvae, but cannot completely kill the eggs parasitic in grain particles. During the storage and sales shelf life, under the right temperature and humidity conditions, the eggs will hatch; after the process of excessive use of chemical drugs, the grains, rice, beans, and wheat are polluted by chemicals and drugs during storage and processing, which is harmful to consumption. public health threat

Microwaves have the characteristics of penetrating and heating medium materials as a whole. However, the power distribution of microwaves in the microwave heating cavity is not absolutely consistent, and the distribution of rice or rice in it is not isotropic. There is a temperature difference on the cross-section (perpendicular to the conveyor belt), generally the middle temperature is high, and the surrounding temperature is low; when the initial temperature of the material is lower, the temperature difference will be larger after microwave heating; the surface rice or paddy is easy to evaporate water; microwave direct heating rice temperature is high After 65°C, or when the temperature difference between the rice is too large, the rice or rice will have bursting, discoloration, dehydration, puffing, ripening and other changes; this patent is useful for overcoming the temperature difference, bursting, and There is no countermeasure for discoloration and water loss; as a result, when granaries or rice factories use this method to kill insect pests, either the insecticidal effect is not good, or the insects are killed, and the quality of the rice is also reduced, which is actually unusable.

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