Miller Magazine Issue: 132 December 2020

48 MILLER / december 2020 Abstract Grain sector contains raw material such as wheat, barley, rye, rice, corn; finished prod- ucts such as flour, semolina, pasta, bulgur, corn grit/flour, bulgur, rice; and by products such as animal feed. When we look at these sectors, the pre-cleaning line used in almost all of them is very similar. It contains some differ- ences according to the design, approach and requirements. One of the most basic issues to be known in the cleaning line is the physical/ chemical properties of the product and the foreign matter it contains, the other is a good knowledge of air and fluids and another is me- chanical information. In this article, cleaning principle and tech- nologies were explained. Additionally, temper- ing stage was analyzed. 1. Introduction: 1.1. Cleaning process When the grain comes to be processed from the field, mainly coarse or fine foreign mate- rials, foreign seeds, plastic pieces, stone, soil, dust, stalk, straw, metal pieces, insect, mouse, microorganism, empty grain, undeveloped grain, diseased grain, toxins, poisonous seeds, sack fragments and many other substances can be found to be contaminated. Since there is no direct processing of the raw material, this cleaning process must start with the pouring of the product into the pitting hole. The clean- ing process works as a unit that must be op- “The cleaning process works as a unit that must be operated according to a certain logic and design. Although these stages are close to each other in flour, semolina and bulgur type milling sectors, there are special applications and systems for each sector. In this article, cleaning principle and technologies were explained. Additionally, tempering stage was analyzed.” Grain cleaning and tempering Mustafa BAYRAM 1,2 1 Prof. Dr., University of Gaziantep, Faculty of Engineering, Department of Food Engineering, Gaziantep, Turkey 2 TABADER Association Chairman, Istanbul, Turkey