METHOD FOR EXTRUSION MOLDING OF THERMOPLASTIC RESIN MATERIAL

摘要

PURPOSE:To prevent the damage of quality due to the lowering of the dimensional accuracy of a product and the increase of a fish eye by using an extruder to which a level meter having a stirrer provided to the lower part thereof is provided so as to position the same inside the line formed by allowing the inclined locus surface from the vertical plane drawing the end ege of a lower discharge port to cross the upper opening surface of a hopper. CONSTITUTION:A powdery thermoplastic resin material 3 mixed with a recovered product in a predetermined ratio is received in the hopper 1 of an extruder from the supply pipe 2 provided above the hopper 1 and a discharge port 4 is provided to the lower part of the hopper 1 to be connected to the extruder 5 and the thermoplastic resin material 3 in the hopper 1 falls to be sent into the extruder 5 by a screw 6. A level meter 7 is provided to the hopper 1 so as to be positioned inside the line L formed by allowing the inclined locus surface S opened upwardly and outwardly at 15 deg., pref., at 10 deg. from the vertical plane V drawiang the upper part of the hopper 1 and the end edge of the discharge port 4 to cross the upper opening surface of the hopper 1 and has a stirrer 7 provided to the lower part thereof.