Avoiding the segregation of feed ingredients during process of mixing, people use pelleting process to increase gelatinization and digestibility of feed so that fish is more apt to receive a totally mixed nutrition. Just as its name implies, fish feed pelleting refers to the process of compressing, pelleting and molding feed ingredients into the shape of pellets under the action of the heat, moisture and pressure. Pelleted and extruded feed produced by floating fish pellet mill and extruder have become the mainstream feed for most fish because of its high digestibility, abundant nutrition and floating properties.
fish feed extrusion process
Pelleting is to process the mixture of feed ingredients under high temperature, moisture and high pressure within floating fish feed pellet mill – raw materials are pressed through die mold. According to lots of experience, too little or too much steam and heat added to the ingredients would produce pellet with poor quality while insufficient temperature and uneven mixing could not kill the dangerous pathogenic micro-organisms existing in feed pellets. The path to the perfect fish feed pellet requires top processing technology and advanced floating fish feed pellet mill and fish feed extruder. In partnership with the feed industry continually strives for pelleting process technology and machine so as to improve the feed conversion rates and nutrition of fish feed. Now let’s discuss the detailed processing of making fish feed pellets.fish feed extrusion, including dry fish feed extrusion process and wet fish feed extrusion process, is the aqua fish feed extrusion process where the raw material is pushed forward in the barrel by means of screws and pressed through the die at the end of barrel. The general fish feed extrusion process involves a high temperature over a short time. Temperature higher than 100â„ƒ is needed in order to achieve expansion of the feed as it leaves the die. The high temperature in dry extrusion is acquired through dissipation of mechanical energy from heated surfaces such as barrel and screw surface, or generated by shear forces between wall and material and screw and material
1.Grinding: in order to accelerate mixing process and increase nutritional utilization, people need to grind raw materials of fish feed into small particles, which always requires a crushing machine – droplet fish feed crusher. In the meantime, the particle sizes of materials have great effect on feed size and quality in the next pelleting process. Generally speaking, the grinding degree for most freshwater adult fish is about 40 mesh (420um), while for juvenile fish, it is around 60 mesh (250um).
2.Mixing: the daily feeding amount of fish is small, hence, feed ingredients should be mixed uniformly after grinding process in order to make sure fish can get complete nutrition from daily feed. The mixing degree of blender is very important in feed production processing because it can influence the quality of fish feed, so choosing a suitable mixing machine is quite significant. Here, we recommend well-designed fish feed mixer FY-500 for equably blending powder or particle materials with good flow ability.
3.Pelleting: if fish farmers want to produce floating feed pellet that hits precise quality targets in terms of size, durability, density and nutritional composition, they should choose suitable floating fish feed pellet machine according to their investment cost, production scale, and feeding characteristics and habits of different aquatic animals. Our floating fish feed pellet mill is able to produce high quality fish feed pellets for fish and also for pets like dog and cat. Moreover, it is not hard to produce floating fish feed pellets with different diameters (usually from 0.9mm to 15mm), just changing the size of floating fish feed pellet mill die mold, which gives fish farmers more flexible choice according to fish type and growth situation.