Sep.05, 2012Keywords:Rice, Rice Storage, Rice Storage Technology
Rice Storage Characteristics and Storage Methods
Storage Characteristics of Rice:
Rice lose the outer protective tissue after grinding, endosperm parts expose, easy to be vulnerable to external temperature, heat and other adverse conditions and insect mold damage.
1. Easy to cracking.
Cracking is due to the rapid heating or cooling, the rice inside and outside the expansion or non-uniform contraction, and external forces. High-moisture rice must be at low temperature or normal temperature conditions, slow cooling, drying, if dried with high-temperature or cooled by sudden, it will cause the cracking, increasing the rate of broken rice. High moisture of rice should be dried firstly, then processed.
2. Easy to aging.
Rice aging mainly as rice quality crisp, reluster, gelatinization and low ability to keep water, viscosity decreased, fatty acid value increased, rice soup dissolution reduced; rice cooked hard and not sticky, and with stale flavor. The general storage of a year, the rice has varying degrees of aging. Rice ages fast, especially in the midsummer season if with large water, high temperature, low precision, much bran powder.
3. Easy moisture absorption and damping
Hydrophilic colloid of rice endosperm directly contact with air, because of its high moisture balance, also sensitive to the ambient temperature, humidity changes, so the rice is very easy to absorb moisture under the storage process.
4. Easy to moldy
5. Easy to insect
1. Normal temperature storage
Conventional storage of rice is best to be stored into silo in winter or cooling the grain in the cold season by mechanical ventilation to improve the stability of rice.Before the temperature rise in spring, keeping closing for the doors, windows and rice grain heap and keeping from moisture with covers, preventing moisture absorption and delay the grain temperature rise.
2. Low temperature storage
First, the natural cold storage: by using mechanical ventilation to blow low temperature air through the autumn and winter to grain pile, cooling the rice temperature to the low temperature state, and by using grain heat resistance, thermal conductivity of small features, to keep the grain low temperature for a long time. Second, in the summer and autumn season, mechanical refrigeration to supplement the cold source to maintain the low-temperature state of grain heap.
3. Rice atmosphere storage and preservation
Biological or artificial methods to change the ratio of air composition of grain heap, so that certain gas concentrations maintained at a certain range, to inhibit mold growth, eliminate pests, reduce food respiration, slow down the quality of food changes. Rice gas storage methods are natural hypoxia, vacuum packaging, filling carbon dioxide, nitrogen, molecular sieve nitrogen-rich and oxygen deoxidizer oxygen.
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