Vukmirović D, Fišteš A, Lević J, Čolović R, Rakić D, Brlek T, Banjac V
Institute of Food Technology, University of Novi Sad, Novi Sad, Serbia.
Faculty of Technology, University of Novi Sad, Novi Sad, Serbia.
J Anim Physiol Anim Nutr (Berl). 2017 Oct;101(5):857-867. doi: 10.1111/jpn.12489. Epub 2016 Feb 22.
Poultry diets are mainly used in pelleted form because pellets have many advantages compared to mash feed. On the other hand, pelleting causes reduction of feed particle size. The aim of this research was to investigate the possibility of increasing the content of coarse particles in pellets, and, at the same time, to produce pellets with satisfactory quality. In this research, the three grinding treatments of corn were applied using hammer mill with three sieve openings diameter: 3 mm (HM-3), 6 mm (HM-6) and 9 mm (HM-9). These grinding treatments were combined in pelleting process with three gaps between rollers and the die of pellet press (roller-die gap, RDG) (0.30, 1.15 and 2.00 mm) and three moisture contents of the pelleted material (14.5, 16.0 and 17.5%). The increased coarseness of grinding by the hammer mill resulted in the increased amount of coarse particles in pellets, especially when the smallest RDG was applied (0.30 mm), but pellet quality was greatly reduced. Increasing of RDG improved the quality of pellets produced from coarsely ground corn, but reduced the content of coarse particles in pellets and increased specific energy consumption of the pellet press. Increasing the moisture content of material to be pelleted (MC) significantly reduced energy consumption of the pellet press, but there was no significant influence of MC on particle size after pelleting and on the pellet quality. The optimal values of the pelleting process parameters were determined using desirability function method. The results of optimization process showed that to achieve the highest possible quantity of coarse particles in the pellets, and to produce pellets of satisfactory quality, with the lowest possible energy consumption of the pellet press, the coarsest grinding on hammer mill (HM-9), the largest RDG (2 mm) and the highest MC (17.5%) should be applied.
家禽日粮主要以颗粒形式使用，因为与粉料相比，颗粒料有许多优点。另一方面，制粒会导致饲料颗粒尺寸减小。本研究的目的是研究增加颗粒料中粗颗粒含量的可能性，同时生产出质量令人满意的颗粒料。在本研究中，使用锤片式粉碎机对玉米进行三种粉碎处理，筛孔直径分别为3毫米（HM-3）、6毫米（HM-6）和9毫米（HM-9）。这些粉碎处理在制粒过程中与制粒机压辊与模孔之间的三种间隙（辊模间隙，RDG）（0.30、1.15和2.00毫米）以及制粒物料的三种水分含量（14.5%、16.0%和17.5%）相结合。锤片式粉碎机粉碎粒度变粗导致颗粒料中粗颗粒数量增加，尤其是在应用最小的辊模间隙（0.30毫米）时，但颗粒料质量大幅下降。增大辊模间隙可提高由粗磨玉米制成的颗粒料质量，但会降低颗粒料中粗颗粒的含量，并增加制粒机的单位能耗。提高制粒物料的水分含量（MC）可显著降低制粒机的能耗，但MC对制粒后的颗粒尺寸和颗粒料质量没有显著影响。使用期望函数法确定了制粒工艺参数的最佳值。优化过程结果表明，为了在颗粒料中获得尽可能多的粗颗粒，并生产出质量令人满意的颗粒料，同时使制粒机能耗尽可能低，应采用锤片式粉碎机最粗的粉碎（HM-9）、最大的辊模间隙（2毫米）和最高的水分含量（17.5%）。
