厚度和重力分选稻谷籽粒的品质特性分析

为达到从稻谷籽粒厚度和密度大小来均匀化其品质的目的，对稻谷进行了厚度分选和厚度分选后再进行重力分选加工。结果表明，收获稻谷含水率小于20%后，含水率不同的籽粒无法通过厚度和重力分选加工获得；分选后稻谷籽粒厚度和密度越大，籽粒的加工品质、物理化学、特性糊化特性等都相对较优；同时稻谷籽粒的密度越大，其加工破碎率越低，所能承受的最大三点弯曲作用力越大。因此厚度和重力分选具有使稻谷籽粒按照其内部品质分级和品质均匀化的作用，增加稻谷籽粒的品质附加值。

Quality characteristics of rice grains with different kernel thickness and specific density

In order to homogenize the quality characteristics of rice, rice grains were fractionated by kernel thickness and then separated by kernel specific density. Results indicated that if moisture content of rice was less than 20%, rice grains with different moisture content could not be fractionated by kernel thickness and separated by kernel specific density. Milling quality, physical and chemical properties and pasting characteristics of rice with greater kernel thickness and specific density were better than those of rice with less kernel thickness and specific density. The greater kernel specific density was, the lower broken rate was, and also the greater maximum three-point breaking force was. Rice grains are graded through kernel thickness fractionating and kernel specific density separating according to quality of rice grains and the quality of rice is also homogenized, so added value of rice with high quality is increased.