Screwless drum extruder

Disk extruders. There are several types of screwless extruders. These machines employ a disk or a drum to plasticate, mix, and extrude. Most designs are based on viscous drag flow. They include Maxwell s elastic melt extruder, Westover s stepped disk and drum extruders, and Diskpack [39]. The Diskpack extruder has the capability of performing all the elementary steps of plastics processing by combination of differently shaped rotating... 

There are a number of machines that do not utilize Archimedean screw for transport of the material, but still fall within the category of continuous extruders. Sometimes these machines are referred to as screwless extruders or elastic melt extruder. These machines employ disks or drums to melt, mix, pump, and extrude the material and are based on viscous drag transport principle. They are not widely used in industry as forming machines, and will not be discussed here. 

There are several extmders that do not use an Archimedean screw for transportation of materials, but still belong to the category of continuous extruders. These machines are sometimes referred to as screwless extruders. Usually they employ a disk or a drum. Most disk extruders are based on a viscous drag transport principle. To this category belong stepped disk extruders (Raleigh 1879 Westover 1962), drum extmders, spiral extmders (Ingen Housz 1975), disk pack extmder (Tadmor 1979, 1980 Tadmor et al. 1979,1983 Hold et al. 1979 Valsamis 1983), and many others. 

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