Application of feed puffing technology in feed production
Puffing technology refers to a certain moisture content of material is fed into extrusion machine, under the promoting function of the screw, screw, material into the axial moving forward, material and screw, material to the mechanical friction within the barrel and the material, the material being strongly extrusion, mixing, shearing, further refinement, the homogenization of material, then the machine cavity internal pressure and temperature increasing and increases, material in high temperature, high pressure and high shear force, under the action of complex physical and chemical changes have taken place in material components. Finally, the paste material is ejected from the die hole, and the pressure difference is generated instantly, and the material is expanded to form a loose, porous and crisp expanded product, so as to achieve the purpose of extrusion and expansion.
During the puffing process of the dog feed machine, the material has undergone great changes in texture, structure and appearance. The extrusion effect is closely related to extrusion temperature, feed speed, material moisture, screw speed, die size and other technical parameters.
1. The advantages of puffing technology: the feed raw materials after puffing treatment have a unique flavor and fluffy feeling, good palatability, high gelatinization degree, and good food attraction effect. At the same time, part of the long chain structure of proteins and fats and other organic matter into a short chain structure, making it easier for pets to digest and absorb. After extrusion, starch gelatinization and degradation of starch main has changed from two aspects: one is starch gelatinization, puffing process dividing raw corn starch molecules in the dense crystal structure, crystal structure began to water absorption, hydrogen bond began to fracture, the expansion of the starch granule is broken, and become a kind of viscous molten body, the extrusion machine due to the instantaneous pressure drop at the exit, instant steam loss makes a lot of swelling starch granule disintegration, starch gelatinization, form many microporous expanded corn; On the other hand, starch degradation, the average molecular weight of starch decreased significantly, through cracking can produce small molecule oligosaccharides such as maltodextrin. The gelatinized starch has strong water absorption and much stronger adhesion function than ordinary starch, which can reduce the usage of starch in production and provide more choice opportunities for other raw materials. Gelatinized starch can bind protein to starch matrix closely to form rumen non-degradable protein, namely rumen transprotein, which can improve the utilization of protein in ruminants.
2. Increased palatability: protein denaturation When the material containing protein is subjected to the combined action of high temperature, high pressure and high shear force in the dog feed machine, the molecular structure of protein is extended and reorganized, the surface tends to homogenize, and the intermolecular hydrogen bond and disulfide bond are partially broken, leading to the final denaturation of protein. The degree of protein denaturation is closely related to the parameters in the extrusion process, and the digestibility of the processed fat is close to that of the oil extracted from the extracted meal. Extrusion can also combine fat with starch or protein to form compound product lipoprotein or lipopolysaccharide, which reduces the content of free fatty acids, inactivates lipase, inhibits the degradation of oil, and reduces the racification of oil components during storage and transportation of products. Increased palatability and digestibility The puffed feed has smaller granularity, crispiness, and a burnt flavor, which improves palatability.
3. Improved digestibility: the puffed feed of the dog feed machine presents a loose and disordered structure, which provides a larger contact area for the action of enzymes, reduces the sterostericity, and exposes the amyloid chain and peptide chain, speeding up the action speed of enzymes, which is conducive to the digestion and absorption of the feed for pets, and then improves the digestibility of the feed.
Therefore, the use of puffing technology to produce dog food has become a general consensus in the current feed market, and the dog food feed machine has been recognized by more and more feed manufacturers. How to choose a suitable dog food machine has become the primary problem for dog feed manufacturers to choose and buy. Jinan FLD Machinery Co., Ltd can help you. Contact: Kevin, Tel :86-18660429170. Our company will wholeheartedly provide you with better prices and more reasonable product solutions.
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