Benefit of moisture removal from feed manufactured solids with vacuum technique and its comparison to traditional air cooling method
2012
Miladinovic, Dejan (Norwegian University of | Life Science (UMB), Ås (Norway). Centre for Feed Technology - Fôrtek, Animal Experimental Centre (SHF)) | Svihus, Birger (Norwegian University of | Life Science (UMB), Ås (Norway). Department for Animal and Aquacultural Sciences (IHA)) | Sørensen, Mette (Norwegian University of
Vacuum dehydration technique (VDT) is known as a rapid evaporative technique for moist and porous solid products. Known advantages of VDT is short processing time, extension of products shelf life and improvement of product properties related to quality and safety issues. In this study, animal feed wheat-based diets with different particle size distributions, ground by hammermill, through 1, 3 and 5mm screen size was manufactured through different pellet-die hole diameters (2, 3.5 and 5mm). Moisture was removed by traditional air dehydration technique (ADT) or VDT. Measuring the dry matter was done immediately after the dehydration of feed pellets. Pellet durability index (PDI %) and hardness analysis were done 30 days after the dehydration. Successive dynamics of water loss was performed better while using the VDT compared to ADT where VDT appeared to reach the industrial moisture equilibrium much faster. It was not observed a clear pattern of influence on dehydration efficiency of different feed structure represented by particle size distribution. The volume increase of the product confirmed to have negative influence on moisture removal from feed pellets when conventional ADT was subjected whereas no clear outline was confirmed for VDT. This explains that increase of feed pellets diameter can limit the moisture removal for both, VDT and ADT. The VDT has demonstrated positive influence on PDI when compared to traditional ADT. Pellet hardness analysis didn’t show clear influence of the different dehydration techniques on manufactured feed solids.
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