Difference between twin screw extruder and single screw extruder .
Firstly, taking the production of aquatic feed as an example, we distinguish the single screw extruder from the twin-screw extruder in terms of structure according to the expanded materials and purposes,
Generally:
- single screw extruder: suitable for processing all kinds of raw materials and ordinary livestock and poultry compound feed
- twin screw extruder: the final product requires good molding and beautiful appearance, compound feed (aquatic products, pet food) with uniform maturity and adjustable density, and raw materials with high added value（ ɑ Starch, tissue protein, etc It should be noted that the above division is not absolute. For example, we recommend using twin-screw to produce aquatic feed, but at present, many enterprises use single screw to produce aquatic feed. Many articles have introduced their application in aquatic products
In short, compared with single screw, twin screw has the following advantages:
- high yield, up to 98% or higher.
- the particles are well formed and uniform in shape. Twin screw die pressure is very stable to ensure consistent particle forming.
- the unique strong pumping capacity of twin-screw ensures no backflow and blockage. After strong quenching and tempering, the steam content in the material is high, and the single screw is prone to steam overflow and reverse injection in the feeding area, resulting in unstable material flow and blocking the machine, while the twin screw will not have a similar situation.
- it can continuously and stably produce all kinds of small particle products. When producing particles with diameter of 2mm and below, the working condition of single screw is unstable, the yield will drop sharply, and the material type will become worse.
- density control is more stable and reliable. The materials melt more fully and evenly in the twin-screw barrel, which can accurately control the production of floating materials, submerged materials and slow settling products.
- it has wide adaptability to formula and is more suitable for high-energy formula production. Twin screw can produce high-energy formula with fat content of 11 ~ 13% (up to 17% according to foreign data), while single screw generally does not exceed 6 ~ 8%.
- easy operation and stable production process.
It is precisely because of the many advantages of twin-screw compared with single screw in the production of aquatic feed, we suggest that twin-screw extruder should be preferred in the production of this kind of products. Of course, the investment and production cost of twin-screw are much higher than that of single screw, which should be considered according to the actual situation.
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