Extruder screw having paths within the screw, extruder, and extrusion method
AssigneesShibaura Machine Co., Ltd., HSP Technologies Inc.
InventorsAkiyoshi Kobayashi, Shigeyuki Fujii, Takafumi Sameshima, Hiroshi Shimizu
Life of this patent
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Abstract
An extruder screw conveying raw materials while kneading them includes a screw main body, conveyance portions, barrier portions, and paths. The conveyance portions convey the raw materials in an axial direction. The paths each include an entrance and an exit. The raw materials, the conveyance of which is limited by the barrier portions, flow in from the entrance. The raw materials flowing in from the entrance flow through the paths in an opposite direction to a conveyance direction. The exit is opened in the outer circumferential surface of the screw main body at a position outside the conveyance portions in which the entrance is opened.
Claims9
An extruder screw configured to convey a raw material while kneading the raw material, comprising:
- a screw main body having a straight axial line in a conveyance direction of the raw material, and configured to rotate on the straight axial line, the screw main body comprising cylindrical tubes and an axis of rotation supporting the cylindrical tubes;
- conveyance portions provided with a space between the conveyance portions in an axial direction of the screw main body, and configured to convey the raw material in the axial direction along an outer circumferential surface extending in a circumferential direction of the screw main body with rotation of the screw main body;
- barrier portions provided on the screw main body, and configured to limit conveyance of the raw material at positions adjacent to the conveyance portions;
- and
- paths provided inside the screw main body, and in which of each, the material is allowed to flow,
- wherein:
- the conveyance portions and the barrier portions are each provided on the cylindrical tubes, and disposed along the axial direction of the screw main body, and
- the paths each comprise:
- an entrance opened in outer circumferential surfaces of the cylindrical tubes in the conveyance portions to cause the raw material, the conveyance of which is limited by the barrier portions to increase pressure on the raw material, to flow in,
- an exit opened in the outer circumferential surfaces of the cylindrical tubes to allow the flowing raw material to flow out to the outer circumferential surface of the screw main body, and
- a path main body provided inside the cylindrical tubes and connecting between the entrance and the exit,
- inside one said barrier portion and inside said two conveyance portions adjacent to respective sides of the barrier portion,
- the respective path is provided entirely through the barrier portion and entirely through the two conveyance portions adjacent to the respective sides of the barrier portion,
- the entrance is provided in a downstream end of one of the two conveyance portions,
- the exit is provided in an upstream end of another of the two conveyance portions, and
- the raw material flowing into the entrance flows towards the exit in an opposite direction to a conveyance direction of the conveyance portions.
Dependencies are inferred from the claim text.