Double Screw Extruder vs. Single Screw Extruder: Key Features
Compared to a single screw extruder, the double screw extruder offers the following features:
1. Stable Material Flow
Material flow is stable, unlikely to experience cutoff or billowing, and the production process is reliable.
2. Heat Generation
Most of the heat in a double screw extruder comes from mechanical transformation during operation, with only a small
amount coming from the heating jacket. In contrast, a single screw extruder often requires additional equipment to
preheat quenched materials.
3. Temperature Control and Energy Utilization
The time distribution of material retained in the machine is within a relatively narrow range, making it easier to
control material temperature. Energy utilization is sufficient, and both yield and quality are very stable.
4. Self-Cleaning Effect
The double screw extruder has a self-cleaning screw surface, resulting in stable material transport and minimal
residual material in the cavity when finishing work. There is no need to stop for cleaning when changing production
materials.
5. High Productivity for Challenging Materials
The double screw extruder has high productivity and is suitable for processing materials containing high oil content
(>17%) and high humidity (more than 30% moisture content).
Considerations Before Choosing a Double Screw Extruder
The double screw extruder has a complex structure and requires high-precision machining. Therefore, the investment
for production facilities is much greater if selecting this type. Whether to choose it depends on your actual
situation.
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