Patent ID: 6238079
Filing Date: 2001-05-29
Classification: B29B,B29C

Abstract:
A kneading degree adjusting device for a twin extruder, comprising:a cylinder, said cylinder including at least a feeding part, a kneading part, a gate part and a discharging part provided in order from an upstream side to a downstream side of said cylinder;two screws rotatably provided in said cylinder;opening degree variable channel forming parts respectively provided in said screws at a position corresponding to said gate part, each of said opening degree variable channel forming parts having an outer diameter which is equal to or slightly larger than a diameter of said screw at the root of a flight thereof,an upper guide bore and a lower guide bore provided in said cylinder above and below said screws at a position corresponding to said gate part so as to extend in a radial direction,gate rods rotatably contained in said upper guide bore and said lower guide bore respectively, each of said gate rods being provided with opening degree changing recesses in a form of an opencut adjacent to each other in an axial direction of a corresponding one of said gate rods so as to constitute opening degree variable channels in an annular shape in combination with outer peripheral faces of said opening degree variable channel forming parts, and that each of said opening degree changing recesses includes a first semicircular face having an inner diameter which is equal to or slightly larger than an inner wall face of said cylinder and a second semicircular face having such a shape that one of an upstream side end and a downstream side end of said first semicircular face is diagonally cut and outwardly slanted from said first semicircular face, said second semicircular face having an inner diameter which is equal to or slightly larger than said outer peripheral face of a corresponding one of said opening degree variable channel forming parts;wherein the opening degree variable channels are varied by rotating said gate rods.