A method for the extrusion of an extrusion composition
Coating Plant for Steel Pipe Rubber Extruder
A means for the extrusion of an extrusion composition through a plastic extrusion apparatus having anelongated extrusion barrel features an elongate extrusion screw rotatable there within to convey solid extrusion composition from a feed section of mentioned barrel to and through a solids conveying section to a compression setting for its melting down and to a downstream extrusion orifice for the extrusion of the melted down mixture mentioned above, said method consisting of the said extrusion barrel with a plurality of axial grooves which enlongate through the feed section and the solids conveying section and which disappears at the terminal part of the compression section of the barrel, and providing said extrusion screw with at least one helical screw thread ,providing a helical vaulted screw channel or channels having a maximum depth in the area of the feed section of the barrel and a deminshing depth in the area of the compression section therein, which channel or channels disappear(s) at its exit end, whereby solid extrusion composition is fed through to the feed section of the barrel is compressed by the vaulted screw channel or channels into the axial barrel grooves to create a rotation-resistant mass which is moved axially by the screw to substantially fill the solids conveying and compression sections of the barrel, which, increases the dead head pressure exerted by the extrusion composition and increasing the output of said composition from the extrusion orifice.
A means for the extrusion of an extrusion composition through a plastic extrusion apparatus having anelongated extrusion barrel features an elongate extrusion screw rotatable there within to convey solid extrusion composition from a feed section of mentioned barrel to and through a solids conveying section to a compression setting for its melting down and to a downstream extrusion orifice for the extrusion of the melted down mixture mentioned above, said method consisting of the said extrusion barrel with a plurality of axial grooves which enlongate through the feed section and the solids conveying section and which disappears at the terminal part of the compression section of the barrel, and providing said extrusion screw with at least one helical screw thread ,providing a helical vaulted screw channel or channels having a maximum depth in the area of the feed section of the barrel and a deminshing depth in the area of the compression section therein, which channel or channels disappear(s) at its exit end, whereby solid extrusion composition is fed through to the feed section of the barrel is compressed by the vaulted screw channel or channels into the axial barrel grooves to create a rotation-resistant mass which is moved axially by the screw to substantially fill the solids conveying and compression sections of the barrel, which, increases the dead head pressure exerted by the extrusion composition and increasing the output of said composition from the extrusion orifice.
