Patent ID: 6045348
Filing Date: 2000-04-04
Classification: B29C

Abstract:
A powdery material feeding hopper structure, for an in-line screw injection or extrusion molding machine having a plasticizing cylinder fitted in a cylinder housing connected to a plasticizing cylinder, for feeding a powdery material to be molded into said plasticizing cylinder, said structure comprising:a material feed port, disposed in said plasticizing cylinder, for providing a communication between the interior and the exterior of said plasticizing cylinder;a hopper, disposed upstream of said material feed port, for feeding said powdery material via said material feed port to the outer periphery of a screw within said plasticizing cylinder; anda material feeding tube projecting from the bottom of said hopper for providing a communication between the bottom of said hopper and the vicinity of the outer periphery of said screw;said material feeding tube having an outer peripheral surface radially spaced from the inner peripheral surface of said material feed port by a gap extending from the vicinity of the outer periphery of said screw to open air for allowing gas in said plasticizing cylinder to escape, the lower end opening of said material feeding tube confronting the outer periphery of said screw being positioned on the outside of a fitting portion of said cylinder housing.