Extruder screw having paths within the screw, extruder, and extrusion method
AssigneesToshiba Kikai Kabushiki Kaisha, HSP Technologies Inc.
InventorsAkiyoshi Kobayashi, Shigeyuki Fujii, Takafumi Sameshima, Hiroshi Shimizu
Life of this patent
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Abstract
An extruder screw includes a screw main body, conveyance portions, barrier portions, and paths. 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 of the conveyance portions. The exit is opened in the outer circumferential surface of the screw main body at a position on an upstream side in the conveyance direction in the conveyance portions in which the entrance is opened.
Claims14
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 axial line;
- conveyance portions provided 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, in each of which the raw materials flows,
- the conveyance portions and the barrier portions are alternately arranged along the axial direction of the screw main body,
- the conveyance portions includes third conveyance portions adjacent to the respective barrier portions and second conveyance portions adjacent to the respective third conveyance portions, and
- in the respective third conveyance portions, and a second conveyance portion and a barrier portion adjacent to respective sides of the respective third conveyance portion,
- the paths each comprise an entrance opened on a side of the respective barrier portion, of the outer circumferential surface of the respective third conveyance portion 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 on a side of the respective second conveyance portion, of the outer circumferential surface of the respective third conveyance portion to allow the flowing raw material to flow out to the outer circumferential surface of the screw main body, and a path main body connecting between the entrance and the exit, and
- the raw material flowing into the entrance flows towards the exit in an opposite direction to a conveyance direction of the conveyance portions.
An extruder screw configured to convey a raw material while kneading the raw material, the extruder screw comprising:
- a screw main body having a straight axial line in a conveyance direction of the raw material, and configured to rotate on the axial line, and
- conveyance portions configured to convey the raw material, barrier portions configured to limit conveyance of the raw material, and a path through which the raw material flow is provided at places of the screw main body,
- wherein
- in at least one of the places,
- the path is provided inside the screw main body,
- the conveyance portions and the barrier portions are alternately arranged along the axial direction of the screw main body,
- the conveyance portions includes third conveyance portions adjacent to the respective barrier portions and second conveyance portions adjacent to the respective third conveyance portions, and
- in the respective third conveyance portions, and a second conveyance portion and a barrier portion adjacent to respective sides of the respective third conveyance portion,
- the paths each comprise an entrance opened on a side of the respective barrier portion, of the outer circumferential surface of the respective third conveyance portion 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 on a side of the respective second conveyance portion, of the outer circumferential surface of the respective third conveyance portion to allow the flowing raw material to flow out to the outer circumferential surface of the screw main body, and a path main body connecting between the entrance and the exit, 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.