| 摘要 |
PROBLEM TO BE SOLVED: To realize the smooth flow and delivery of a fiber reinforced resin through a nozzle by a method wherein the relationship between the outer diameter of each screw and the distance from the extruder barrel side edge face of a die holder connecting with an extruder barrel to a nozzle outlet and the diverging angle of the interior passage of the die holder in a twin-screw extruder are specified. SOLUTION: At the use of a twin-screw extruder 1, inequalities: L<=2K and 0 deg.<=θ<=15 deg. are satisfied, in which K is the outer diameter of a screw, L is the distance from the extruder barrel side edge face of a die holder 2 to a nozzle outlet and (θ) is the diverging angle of the interior passage of the die holder 2. If L is larger than 2K or (θ) is larger than 15 deg., reinforcing fibers tent to accumulate on the side of the die holder and, in a structure with the above- mentioned conditions, no fan-like divergence with an acute angle of a resin composition develops. If the distance L of the die holder 2 is shorter, the accumulation of reinforcing fibers becomes difficult. Thus, the pellet of the fiber reinforced resin composition can be manufactured under the condition that no cutting of strands develops, the accumulation of reinforcing fibers in the holder is prevented from developing and a small ununiform extrusion is resulted. |
