EXTRUDER SCREW, EXTRUDER, AND EXTRUSION METHOD

摘要

A conveyance portion, a barrier portion, and a path are provided at places of a portion of a screw main body in which a kneading portion is provided. In at least one of the places, an entrance is opened to cause raw materials, conveyance of which is limited by a barrier portion to increase pressure on the raw materials, to flow in. The raw materials flowing in from the entrance flow through the path in the opposite direction to a conveyance direction of the conveyance portion. An exit is opened in an outer circumferential surface of the screw main body at a position outside the conveyance portion in which the entrance is opened.

主权项

1. An extruder screw comprising:
a transfer portion configured to continuously convey supplied materials; a melt-and-mix portion configured to continuously melt and mix the conveyed materials; and a kneading portion configured to continuously knead raw materials obtained by melting and mixing the materials, wherein the transfer portion, the melt-and-mix portion, and the kneading portion are provided in a screw main body configured to rotate on a straight axial line, and a conveyance portion configured to convey the raw materials, a barrier portion configured to limit conveyance of the raw materials, and a path through which the raw materials flow are provided at places of a portion of the screw main body in which the kneading portion is provided, wherein in at least one of the places, the path is provided inside the screw main body, and comprises an entrance and an exit, the entrance is opened in an outer circumferential surface of the screw main body in the conveyance portion to cause the raw materials, the conveyance of which is limited by the barrier portion to increase pressure on the raw materials, to flow in, the raw materials flowing in from the entrance flow through the path toward the exit in an opposite direction to a conveyance direction of the conveyance portion, and the exit is opened in the outer circumferential surface of the screw main body at a position outside the conveyance portion in which the entrance is opened.