Set Screw
machanism of twin screw extruder
A twin screw extruder comprising: an elongated barrel presenting an inlet and a spaced outlet and having a barrel opening configured to receive a twin screw set therein; and a twin screw set within said barrel and including first and second elongated screws each leaving a central shaft presenting a shaft rear end and a shaft front end and a longitudinal axis, outwardly extending helical flighting along the length of the central shaft with the flighting having a flighting rear end, a flighting front end, an outer surface spaced from the central shaft and defining a flighting depth between the flighting outer surface and said central shaft, the flighting depth on each shaft progressively tapering along the length thereof through a taper angle from a location adjacent the flighting rear end to a location adjacent the flighting front end so that the flighting depth adjacent the flighting rear end is greater than the flighting depth adjacent the flighting front end, said first and second screws configured to corotate.
A method of producing an extruded product, comprising the steps of: providing an extruder comprising an elongated barrel presenting an inlet and a spaced outlet and having a barrel opening configured to receive a twin screw set therein; and a twin screw set within said barrel and including first and second elongated screws each having a central shaft presenting a shaft rear end and a shaft front end and a longitudinal axis, outwardly extending helical flighting along the length of the central shaft with the flighting having a flighting rear end, a flighting front end, an outer surface spaced from the central shaft and defining a flighting depth between the flighting outer surface and said central shaft, the flighting depth on each shaft progressively tapering along the length thereof through a taper angle from a location adjacent the flighting rear end to a location adjacent the lighting font end so that the flighting depth adjacent the flighting rear end is greater than the lighting depth adjacent the flighting front end; and passing an extrudable starting material into said barrel inlet and corotating said screw set in order to beat and pressurize said material within the barrel, and extruding the heated and pressurized material from said outlet end.
A twin extrusion screw set comprising: first aid second elongated screws each having a central shaft presenting a shaft rear end and a shaft front end and a longitudinal axis, outwardly extending helical lighting along the length of the central shaft with the flighting having a flighting rear end, a flighting front end, an outer surface spaced from the central shaft and defining a flighting depth between the flighting outer surface and said central shaft, each of said shafts progressively tapering along the length thereof through a first taper angle from a point adjacent the shaft rear end to a point adjacent the shaft front end so that the shaft diameter adjacent the shaft rear end is greater than the shaft diameter adjacent the shaft front end, the flighting depth on each shaft progressively tapering along the length thereof through a second taper angle from a location adjacent the flighting rear end to a location adjacent the lighting front end so that the flighting depth adjacent the flighting rear end is greater than the flighting depth adjacent the flighting front end, said first and second screws being located in adjacent, side-by-side relationship and each oriented at an angle relative to the adjacent screw so that the longitudinal axes of the first and second screws define an included angle, the width of the outer flighting surface of each Screw progressively increasing along the length of the screw from a location adjacent the flighting rear end to a location adjacent the flighting front end.
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