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Double screw extrusion machine
2017-1-3

Double screw extrusion machine is one of the many screw extrusion machine, is in single screw extrusion machine, developed on the basis of the double screw extrusion machine barrel, placed side by side two screw, therefore calls the double screw extrusion machine.

According to the relative position of the screw can be divided into mesh with the mesh, mesh and mesh can be divided into the part and the whole mesh type;

According to the screw rotate to can be divided into two categories, rotation direction and reverse rotation, reverse rotation and can be divided into inward and outward.

Different synthetic rotating twin screw pressure area, material within the sleeve cavity by the rotation of the screw, produce high and low pressure area.

It is obvious that the material will flow from high to low pressure area in the direction of the two: one is with screw rotation of the screw wear is reduced, this is the material after delivery, shear, mixing and heating barrel casing, in the high temperature,

Under the action of high pressure to achieve maturation, and finally out of the tube.

Counter-rotating twin screw extrusion machine generally USES two completely same size, but opposite direction of screw thread.

Rotate inward and outward rotation difference is depending on the location of double screw inward to compete on low pressure produced by the rotation of the material by double screw, can produce high pressure at the entrance, feeding difficulties, caused by the current reverse rotary rarely USES the inward;

Double screw on the outward pressure produced by the rotation of high low, is advantageous to the feed.

But reverse rotation compared with synthetic rotation, the material in the screw C shape formed by the material flow can't moving from one screw to the root of the screw, is expected to produce mixed degree decreased significantly, the consecrated themselves to a higher rotating twin screw can not effective and stable.

Double screw extrusion machine has the advantages of strong adaptability, sliding conveying and self-cleaning, but its complex structure, high investment cost, the corresponding maintenance and operating costs are high.

Therefore, double screw extrusion machine is generally used in the aquatic products with high added value and the pet food production, such as eel, turtle and young fish feed production, because the price of these products in the market sales to return twin-screw technology of manufacturing the cost of the product;

Other special aquatic feed particles such as aquatic feed (0.8 ~ 1.5 mm) diameter, high fat aquatic products and small quantity but formula often become feed also need to use double screw extrusion machine for production.

Double screw extrusion machine in domestic development relatively late, jinan xin bei hair machinery main products are single and double screw extrusion machine, more than 30 years of its continuous improvement, has a mature production technology and technology, for more than medium-sized double screw extrusion machine, due to its raw material properties change range is bigger, need to adjust the screw rotation speed in a wide range, due to its working principle is different from the single screw extrusion machine, have bigger differences in the concrete structure, especially the barrel, screw, the layout of the thrust bearing and gear box is more complex, due to the increased cost of equipment.

Along the sleeve lining to form around two C shape material flow, this is the mainstream of the material;

The other one is formed through part of screw meshing clearance flow.

Causes of countercurrent is left screw to pull the material into the meshing clearance, and the right screw and pull the material from the clearance, material is "up" glyph forward as a result, change the direction of material flow.

This will not only help the material mixing and homogenizing, but also make the generation between the tooth socket screw grinding (namely shear and rolling, rolling effect, this effect compared with reverse screw rolling effect is much smaller.