Study on cost reduction of rice storage using polished rice

目前在日本，大米是以糙米的形式低温储存。从降低成本的角度探讨了精米(清米)的中长期储藏问题。选择稻谷、糙米、精米和两种精米进行储藏试验。此外，还研究了糙米皮损对品质变化的影响。采用含水率和储藏温度两个阶段，测定不同米型的米粒表面色泽、脂肪酸度、口感等品质指标值。结果表明，即使在高温、高水分条件下贮藏时，品质指标值也是朝着劣化方向变化的。尤其是精米，变化较大，最不适合储藏形式。对于精米而言，即使在25℃储藏条件下，品质变化也较小。而且，即使对于约1…的水分含量，变化宽度也很小超过5%的WB(如果是15℃存储)。因此，判断以精米的形式储存在成本方面是有利的。从保质的角度来看，稻谷保鲜是最好的保鲜方法，但由于大容量的要求，目前还很难实施，今后还需要进行选择。当稻谷、精米、精米的储存量为1时，稻谷、精米、精米的储存量分别为1.62、0.89、0.86。如果将糙米储藏改为精米储藏，储藏容量将下降14%，储藏库的有效利用成为可能。于是，在糙米处理设施中以搬运等处理的顺序采集样品，测定了皮肤损伤度和脂肪酸值的增加率。结果表明，机械处理增加了皮肤损伤，质量变化率较高。因此，如何才能使皮肤损伤最小，必须在设施内的各种处理中进行讨论。较少

In Japan at present, rice is stored at low temperature with the form of brown rice. The middle/long-term rice storage using the polished rice (clean rice) was discussed from the viewpoint of cost reduction. Paddy, brown rice milled rice and two kinds of polished rice were chosen for the storage test. Also, the influence of skin damage of the brown rice on the quality change. Two stages of moisture content and storage temperature were adopted, measuring the quality index values such as grain surface color, fat acidity value, taste value of each rice form. It was confirmed that even either quality index value changes in the direction of the deterioration at the time of the storage in the high temperature, high moisture content. Especially, as for milled rice the change is big, it was most inappropriate for the form of storage. As for the polished rice, even in 25 ℃ storage the quality change is comparatively small. Also, the change width was small even for the moisture content of about 1 … More 5%WB, if it is 15 ℃ storage. Therefore, it was judged that the storage by the form of polished rice is advantageous in respect of a cost. The storage by the paddy form is the most excellent method from the point of quality preservation, although it is hardly carried out to require big capacity and need to put to the choice from now on. Furthermore, the capacity of paddy, milled rice, polished rice were 1.62, 0.89, 0.86 respectively, when they make the capacity of brown rice 1. If brown rice storage is changed to polished rice storage, 14% of capacity decreases and the efficient application of the storage warehouse becomes possible.Next, it became clear that skin damage exerts a big influence on the change of rice quality other than the moisture content and storage temperature in brown rice storage. Thereupon, gathering the sample with the order that the handling of conveyance etc. goes on in the facility which treats brown rice, the increase rate of skin damage degree and fat acidity value were measured. As a result, it became clear that the mechanical handling increases the skin damage and changing rate of quality becomes high. So, the plan which can make the skin damage small must be discussed at the various kinds of handling in the facility. Less