Fish Feed Extruder And Expander For Aquatic Pellet Production - China

Extrusion processing technology has become of major importance in the aquatic feed pellet production line of modern feeds used in intensive aquaculture.

Fish feed extruder is the prominent machine applied in aquafeed production, where the feed is subject to mixing, shearing and heating under high pressure before the extrudate finally is forced through a die.

In recent years, there has been a constant growth in the application of extruded diets for aquatic feeding.

Aquatic feed by extrusion have superior water stability, better floating property and a higher energy than pelleted diets, which contributes to the increase in fish growth and improvement in feed conversion.

Therefore compared with the conventional pelleting process, extrusion technology is the most efficient way to improve the performance of aquatic feed.

Extrusion And Expansion Process

Extrusion, including dry extrusion and wet extrusion, is the 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 extrusion process involves a high temperature over a short time.

Temperature higher than 100℃ 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.

For wet extrusion, the temperature is achieved through preconditioning and steam injection.

At the same time the material also undergoes relatively high pressure.

The pressure difference in the interior of fish feed extruder and the external environment will cause the extrusion of the aquatic feed.

Basically, the operating principle of expansion is similar to that of extrusion, and their processes are both based on the same principle.

However, expansion generates less shear, pressure and temperature in the barrel compared with extrusion, which leads to difference in the shaping method of final pellets and intensity of treatment.

Extruder And Expander

Fish feed extruder and expander are machines that mainly apply extrusion and expansion technology in feed pellet production.

An extruder is a bio-reactor providing the necessary pressure to force feed mash in the barrel through a restrictive die.

Through changes in temperature, pressure, and shear within the barrel, the raw material is forcibly homogenized before it assumes the cross-sectional shape of the die opening.

Extrusion equipment is mainly composed of power transmission device, feeding device, pre-conditioner, extruder barrel and discharging cutting device, etc.

The barrel of extruder is composed of barrel heads, screw auger, flow restrictors (called shearlocks) and a cross-sectional die.

Expanders are similar to extruders, but they have difference in treatment effects and applications.

Expanders are commonly used as mechanical conditioners for treating materials which are difficult to pellet, to increase the digestibility of cellulose and protein components in order to perform feed hygienistion.

Extruders consist of barrels with one or two screws to transport materials and force them through a die.

Extrusion can be considered as a high shear treatment.

The shear action during expander treatment is much less.

Compared to an extruder, the simplicity of the expander allows an effective treatment of relatively large quantity of feed at a low cost.

Extrusion machine has received the dominating role production of fish feed.

For extruder, there are different types available in the market, such as single screw extruders, twin screw extruders, wet extruders, dry extruders and etc.

Company Contact:

• Posted By: Zhengzhou Fusmar Machinery Co.,Ltd

• Phone: +8615838279423

• Address: No.45 Agricultural Road, Jinshui District, Zhengzhou , Henan , China

• Email:

• Website: https://www.feedpelletmills.com

• Business Description: Zhengzhou Fusmar Machinery Co.,Ltd is a professional fish & animal feed pellet machinery and wood pellet machinery manufacturer.
  
  We have our own engineer and sales team to provide best machines and services to our customers worldwide.
  
  Our products mainly include floating feed pellet machine,animal feed pellet machine,feed grinding machine, feed mixer,wood crushing machine,wood chippers,hammer mills,pellet coolers, pellet packing machine,conveyors and other spare parts.