© shutterstock.com by mizar_21984
Extruders are conveying devices that press solid to viscous materials evenly out of a shaping opening under high pressure and high temperature according to the functional principle of the Archimedean screw. Extruders can be divided into two process principles: Processing and compounding extruders. Processing extruders are mainly used for shaping, while compounding extruders are used for chemical and/or physical modification of materials.
The extruder was already used for the rubber industry before 1900. After some time, the food industry also discovered versatile applications. Due to the great boom in the plastics industry in the middle of the last century, the extruder has also established itself as an important process engineering element in the continuous production of thermoplastic articles.
Depending on the product, it operates at pressures of 10 to 300 (700) bar and temperatures between 60 and 300° C. The length designations of the extruders are given in 25D, 30D, 40D etc., which means multiplying the screw diameter by 25 (30, 40 etc.) gives the length.
At Ebbecke Verfahrenstechnik in Brucköbel we use various extruders for contract compaction services.