Patent ID: 6474972
Filing Date: 2002-11-05
Classification: B29B,B29C,B29K

Abstract:
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 |Aâˆ’C|&lE;B, said feedback coefficient E is set in the range of 0.1&lE;E&lE;0.7 and when |Aâˆ’C|>B, said feedback coefficient E is set in the range of 0.8&lE;E&lE;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+EÃ—{(Aâˆ’C)Ã—D/C}.