While turning the screw inside the metrical mannered null heating cylinder

摘要

PROBLEM TO BE SOLVED: To provide a metering method of an injection-molding machine for molding a disc substrate which can shorten metering time in order to cut short a molding cycle time of the injection-molding machine.;SOLUTION: This metering method of the injection-molding machine 1 for molding a disc substrate makes a screw 10 inside a heating cylinder 6 recede, while supplying a polycarbonate resin forward of the screws 10, by rotating the screw 10 with the help of a motor 15 for screw rotation. The setting temperature of a part, of the heating cylinder 6, corresponding to a compression zone 10b and a metering zone 10c of the screw 10, is set at 300 to 390 °C. In addition, the number of screw revolutions is set so that its control at a uniform rate is possible at 400 to 550 rpm during the period of 0.30 to 0.55".;COPYRIGHT: (C)2007,JPO&INPIT