Single Screw VS Twin Screw Extruder
In the market, puffed foods are very popular and loved by people, such as the QICHI French fries, Onion rings, potato sticks, cheese sticks,corn curls, LAY‘S potato chips, cheetos, Chiduo, Orion . Do you know how are puffed snacks made? In the snack food suppliers, most puffed snacks are made from snack machine of snack food machinery manufacturers.has been widely used in food processing. Extruders is divided into single screw and double screw in structure single screw extruder, it including single screw extruder design and twin screw extruder design. .
single screw vs twin screw extruder
|
Single screw extruder |
Twin screw extruder |
|
mixing capability is very limited |
remarkable mixing capability, mixing to be precisely adjusted leading to control the degree of mixing. |
|
Lower process productivity |
higher process productivity |
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Controllable constant temperature |
|
|
Raw materials is potato starch, corn starch, cassva starch and others |
Many kinds of grain powder like corn powder, wheat flour, rice powder, cereals powder and others |
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Easy to pour powder |
Not easy to pour powder |
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Material sticking screw |
Self-cleaning function |
|
Snacks pellet, potato sticks,pellet wave chips |
Cereals, corn flakes, puffy snacks, doritos chips, doritos chips and others |
The working principle of the twin screw and single screw is different. There are big differences in the specific structure, especially the arrangement of the barrel, screw, thrust bearing and gear box. The comparison results of the twin screw and single screw under the same production capacity are as follows
|
Item |
single screw extrusion machine |
double screw extruder |
|
|
Price ratio |
Extruders |
1.0 |
5 N - 5 |
|
System |
L0 |
0. 9-3 |
|
|
|
Conveying capacity |
Lower |
Hign |
|
Self-cleaning ability |
Lower |
Good |
|
|
Maximum wear part |
Discharge section and transition section |
Restriction section and pinch section |
|
|
screw |
Installation location |
Not fixed |
Not fixed |
|
(L/D) |
4—25 |
10—25 |
|
|
Kneading |
Not good |
Good |
|
|
Shear uniformity |
Not good |
Good |
|
|
Residence time ratio |
2 |
1,0 |
|
|
Driver |
Screw speed ratio |
LO-3,0 |
1.0 |
|
Thrust bearing performance ratio |
More then 5.0 |
1. (J |
|
|
Torque to pressure ratio |
More then5.0 |
1 0 |
|
|
Gear box |
sample |
difficult |
|
|
Heat exchange |
Not good |
good |
|
|
-Operability- |
Moisture |
12—35 |
6—hign |
|
Recipt |
Starch |
Wide range |
|
Comparison of working principle of twin screw extruder and single screw extruder
The transportation of materials in the single-screw extruder depends on the friction between the materials and the barrel
The twin screw extruder is "forward conveying", which has the effect of forcing the material forward. In addition, the twin screw extruder also produces a shearing effect on the material at the meshing position of the two screws
The extrusion processing technology of single screw extrusion process, single screw extruder manufacturers use single screw extruder machine to make 2D 3D pellet, it have hign moisture inside, so this pellet can’t use directly, nust go to lower temperature dryer for 2-3 hours dryer, and then the moisture lower then 10%, can freid or baked the pellet to puffy.
The double screw extrusion in food processing is the cereals powder can directly puffing from the extruder machine. And then goto hign tempreture dryer for 10mins dryer is ok. Then seaning it foto pack.
The different snacks for single screw extruder and double screw extruder for sal