Patent ID: 7677787

Claim:
A mixing degree adjusting device for adjusting a mixing degree of an object to be mixed by regulating a flow rate of the object to be mixed that flows along round sectional portions, the mixing degree adjusting device being provided at a position corresponding to said round sectional portions in an intermeshing type twin screw extruder in which a pair of screws provided with said round sectional portions having a diameter that is smaller than an outer diameter of a mixing wing portion on a downstream side of the mixing wing portion for mixing the object to be mixed are aligned within a barrel, comprising: a pair of spacer members arranged at a position sandwiching both said round sectional portions from both sides in an aligning direction of said pair of screws; and a pair of drawing members arranged as a position sandwiching both said round sectional portions from both sides in an orthogonal direction that is orthogonal to the aligning direction, said pair of spacer members being movable between an adjusting position for coming into an inside of the outer diameter of said mixing wing portion in the aligning direction and opposing to the round sectional portions, and a retracting position, when said screws are extracted from the barrel, for retracting to the outside until the passage of said screws are accepted, and opposing portions opposing to said round sectional portions at the time of moving to the adjusting position being formed in a substantially linear shape extending substantially in parallel with the orthogonal direction seen from an axial direction of said screws, and said pair of drawing members being formed in a shape in which end parts thereof on both of the round sectional portions side are along peripheral surfaces of said round sectional portions, movable in the direction approaching to and retracting from said round sectional portions along said opposing portions in an area intervening between said opposing portions of both said pair of spacer members at the time of moving to the adjusting position, and when said screws are extracted from said barrel, retractable to the outside until the passage of said screws is accepted.