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screw extruder machine
Conical Twin Screw Extruder

Types and Specifications of Plastic Extruders

January 19 , 2016

Plastic extruders are used to create a wide range of items, including plastic tubing, trims, seals, plastic sheets and rods. Extruder is the machine for producing more or less continuous lengths of plastic sections out of a selected type of plastic resin. The essential elements for a thermoplastic extruder are 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.


Extruders may be divided into some general types: The resin is sometimes not completely melted in the basic extrusion screw. The barrier screw in designed to counter this problem. Additional flights are attached to the transition section so as to separate molten and solid plastic to different channels. As the solid pellet moves forward it melts due to shear against the wall and thus melts and flows into the liquid channel. Thus the solid channel narrow gradually and the liquid channel widens; Single screw extruders and twin screw extuders are the most widely used extruders. The screw that is used to push the resin out of the die is the important component of a screw extruder. In the earlier days rubber screw were used but the rubber screw was not able to give enough amount of shear into the polymer. Therefore, screws were designed that would start deeper in the feed and gradually taper shallower in the metering section to apply more work on the polymer as it was going from the feed to the discharge; When mixing two different additives, a more efficient way is to mix extrusion materials with twin screw extruder. In this method two screw rotate with or against each other and have special mixing features, such as kneading blocks and forward and reverse capabilities. Some single screw systems can, however, be used for mixing.


Extrusion screw design has been improving over the years, with new innovations and ideas that help in perpetually adjusting the process so as to meet the needs of specific applications. We also produced the Conical Twin Screw Extruder, want more information,please visit the website of won-plus.



Related Reading: Twin Screw Extrusion Unit

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