What's the Use of feed pellet extruder ?

Mainly used for a variety of aquatic products, pet and other pellet feed curing molding process (such as: float and sink of fish feed, frog feed, pellet suckling pig feed).

What's the working principle of floating fish feed pellet extruder?

1).During extruding process, material feed from the end of machine cavity convey to the whole cavity by screw, then divided into several regions at extruded part, each region have a ring (press ring) to control flow and press. Screw convey function drive the material through the gap between the press ring and cavity, screw rotating motion generate energy with the friction between material and extruder parts is transformed into thermal energy.

2).In most cases, the material rich with starch and protein is cooked into a sticky dough or gelatinous dough. During the transform process, the material have a large physical and chemical changes, mainly is the results of starch and protein changes.

3)When the material is extruded through molding holes at the end of machine cavity, make the dough material processed into a certain shape. Due to the large of propulsive force of screw inside cavity, the material have a huge pressure, when material is extruded from the molding holes, it instantly vaporized a large quantities moisture, greatly reduce the material moisture content.

4).When produce low density products, it would have a large expansion depends on the molecular structure of material, and all condition and material used during extruding process.

5).When produce high density products, it would not expansion large depends on the purging pressure port on the cavity and all condition and material used during extruding process.

What's the treatment method for low capacity of fish feed extruder?

After using a certain time, it capacity go down. Please inspect refer to the treatment method as following

1). Screw head wear serious

2).The bushing of expanded cavity wear serious

3).Whether the Formulation is changed

Floating material: Starch content ≥20%

Sinking material: Starch content ≥10%

In addition, especially for the floating material, animal protein content can not be too high.

Starch function:

(1) Starch has a strong water absorption

(2) Gelatinized starch can enhance the viscidity.

(3) In the final product with the double effect of expansion and adhesion.

The proteins function in expanded process

(1) Protein has water absorption, elasticity and coagulation;

(2) Protein is divided into plant protein and animal protein

Normally, the formulation with plant protein is much easy operate than with animal protein. Cause animal protein not so well as plant protein or starch which more easy combined or expanded with other ingredients.

4). Molding holes whether reasonable

A=1 holes area   area=πr2

10 holes-8mm mold   8mm diameter =4mm radius

Area =πr2

3.14×16=50.24mm2

10 holes×50.24=502.4mm2