Resin extrusion apparatus

A resin extrusion apparatus comprising:

• a resin extruder for extruding a thermoplastic resin supplied thereto from one end thereof to the outside from the other end thereof;
• a screw, driven by a motor, for supplying powder from a powder container to said resin extruder at an intermediate portion thereof,
• an inverter for setting the number of rotations of said motor for driving said screw;
• a controller controlling a frequency of said inverter;
• a weighing device, connected to said controller, for measuring an actual supply amount of said powder in a predetermined time period;
• and
• a detector for transmitting a measured value of said weighing device to said controller,
• wherein a set supply amount (g) of said powder in said predetermined time period is A;
• a tolerance (g) of said set supply amount is B;
• said actual supply amount (g) of said powder, in said predetermined time period, measured by said weighing device is C;
• a frequency (Hz) of said inverter is D;
• a feedback coefficient is E;
• and a frequency (Hz) of said inverter after a feedback control is executed is F,
• when |A−C|≦B, said feedback coefficient E is set in the range of 0.1≦E≦0.7 and
• when |A−C|>B, said feedback coefficient E is set in the range of 0.8≦E≦1.2,
• whereby said powder is quantitatively supplied to said intermediate portion of said resin extruder by means of a rotation of said screw, based on said feedback-controlled inverter frequency:
• F=D+E×{(A−C)×D/C}.