Patent ID: 6042362
Filing Date: 2000-03-28
Classification: B29C

Abstract:
A thermosetting resin injection molding machine comprising:a heating cylinder including a body having means for introducing a resin material into said body, and a sleeve having an injection port for injecting the resin material; anda screw reciprocally movable in said heating cylinder;wherein said screw includes a body having a flight, and a piston portion provided at a front end of said screw body, and a diameter of said piston portion is smaller than a diameter of said flight;wherein an inner diameter of a working portion of said sleeve is smaller than an inner diameter of said heating cylinder body;wherein a length of said piston portion, a length of said working portion of said sleeve and an annular clearance between said working portion of said sleeve and said piston portion are so determined that a predetermined amount of the resin can remain for cushion molding at a front end of said piston portion during dwell after the injection of the resin material; andwherein a resin compressing portion is interposed between said piston portion and said screw body, and said resin compressing portion has a diameter which is larger than the diameter of said piston portion, and is smaller than the diameter of said flight.