The extrusion process is one that predates plastic itself but it’s one that has become synonymous with plastic applications today. Plastic extruders are used to create a wide variety of things including plastic tubing, trims, seals, plastic sheets and rods.
Most extruders require the same basic elements to work and comprise mainly of a tubular barrel, usually electrically heated; a revolving screw, ram or plunger within the barrel; a hopper at one end from which the material to be extruded is fed to the screw, ram or plunger; a die at the opposite end for shaping the extruded mass.
When it comes to the types of extruders available on the market twin screw extruders are one of the most popular varieties. In this two-part post we’ll look at 5 benefits of twin screw extrusion.
High levels of flexibility
Twin screw extruders, unlike single screw extruders, are designed with throughput and screw speed independency as well as the capacity to handle multiple processing functions such as mixing, cooking, cooling, melting and venting among other things. In the case of single screw extruders throughput and screw speed are dependent, and screw designs with multiple processing functions in series are restricted.
Better mixing capability
Twin extruders feature a broad diversity of specialised screw designs such as kneading blocks, reverse screw techniques, gear mixing elements and a lot more. These features allow for a better degree of mixing intensity and quality because the degree of mixing of ingredients can be adjusted accordingly. With a single screw extruder mixing capability is very limited, and any flow restrictions to enhance mixing through special screw designs lead to depress the extruder throughput.
Lookout for part two of our post where we look at the remaining three benefits of using a twin extruder.
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