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Are you looking to purchase a used twin-screw extruder for your company? In our inventory, you'll find models from well-known manufacturers. We update our online selection weekly and can deliver any listed offer directly to you. We guarantee functionality as we test each machine. From Barneveld, Netherlands, we ship worldwide. You're welcome to visit us during business hours for machine inspection or alternatively arrange a video call.
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Applications of Twin-Screw Extruders
Twin-screw extruders are used primarily in the food, plastic, and pharmaceutical industries for extrusion. The basic principle involves continuously pressing a mass under pressure, often with heat, through an opening to shape it. Afterwards, it hardens, preventing the product from deforming again. The continuous transport of the mass and pressure build-up in the twin-screw extruder are facilitated by two screw shafts. Powder or granules can also serve as starting materials, melting during the extrusion process. In the food sector, extruders are used in the production of noodles, cereals, granulates, or snack items made from potatoes or grains. In the plastic industry, this method is used for producing tubes and films, as well as for degassing plastics.
Variants of Twin-Screw Extruders
The twin-screw extruder, also known as a double screw extruder, operates with two extruder screws. These can rotate either in the same direction or opposite each other, making it a co-rotating or counter-rotating twin-screw extruder. In the co-rotating variant, the shafts are always parallel to each other. Additionally, there's also a counter-rotating design with conically arranged screws. Each construction has its unique characteristics and is suitable for specific applications. Other differences exist in the pressure level built up in the screw and the operating temperature. In this regard, cold, warm, and hot extrusion are distinguished. Besides shaping, this process can also aim to alter the material's physical properties. It's possible to uniformly incorporate dyes or other additives during the process.
Selecting a Suitable Twin-Screw Extruder
Twin-screw extruders are typically designed for specific applications in the plastic, pharmaceutical, or food industries. Especially in food processing, it's important that the machine components in contact with food are food-safe. Find out the temperature and pressure range in which the twin-screw extruder operates. Another important value is throughput, i.e., the quantity the machine can process per unit of time. Pay attention to the dimensions of the extruder screws and the entire machine, as well as the overall weight. You may need a vacuum pump for degassing or the ability to add additives to the material. Besides production use, extruders are also used in laboratories for experiments in product development. There are models specifically optimized for this purpose.
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