Plasticating screw
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsKiyoshi Kinoshita, Tetuo Uwazi, Toshihiko Kariya
Life of this patent
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Abstract
This invention relates to a plasticating screw suitable for use in an injection molding machine or an extruder. In the plasticating screw which is rotatable within a cylinder and has a mixing head (7) with plural groove portions (7a,7b) formed therein, recesses (2,3) in the shape of steps or slopes are formed on an outer peripheral surface (7d) of the mixing head (7) other than the groove portions (7a,7b) so that the recesses are in communication with the groove portions (7a,7b) located forward thereof as viewed in a direction of rotation.
Claims18
A plasticating screw adapted to be rotatably mounted in a cylinder, comprising:
- a stem on and around which at least one spiral screw blade extends;
- and
- a mixing head projecting from one end of said stem, said mixing head having in its circumferential surface a plurality of groove portions each having a uniform width and extending spirally toward and terminating short of a tip of said mixing head, said groove portions being circumferentially spaced at equal distances, said mixing head having a forward end portion toward said tip and a rearward end portion toward said one end of said stem;
- said mixing head further having a plurality of recesses, each having a uniform width, which are disposed and arranged in an inter-groove region of the circumferential surface, said recesses communicating with at least some of said plural groove portions in such a manner that the individual recess joins to the associated groove portion at one side opposite to the direction of rotation of said mixing head, said at least some groove portions being circumferentially spaced at equal distances.
A plasticating screw adapted to be rotatably mounted in a cylinder, comprising:
- a stem on and around which at least one spiral screw blade extends;
- and
- a mixing head projecting from one end of said stem, said mixing head having in its circumferential surface a plurality of groove portions extending spirally toward and terminating short of a tip of said mixing head, said groove portions being circumferentially spaced at equal distances;
- said mixing head further having a plurality of recesses which are disposed and arranged in an inter-groove region of the circumferential surface and communicate with at least some of said plural groove portions in such a manner that the individual recess joins to the associated groove portion at one side opposite to the direction of rotation of said mixing head, said at least some groove portions being circumferentially spaced at equal distances
- wherein being said plural groove portions include:
- a number of first groove portions each extending at a front end thereof into a base of a forward end portion of said mixing head and extending toward and terminating at a back end thereof short of a rearward end portion of said mixing head, and
- a number of second groove portions each extending at a back end thereof into a rearward end portion of said mixing head and extending toward and terminating at a front end thereof short of said forward end portion of said mixing head,
- wherein said first and second groove portions are alternately arranged on said mixing head with their either front or back ends staggered, and
- wherein said recesses include:
- a number of first recesses located in said forward end and communicating one with each of said first groove portions, and
- a number of second recesses located in said rearward end and communicating one with each of said second groove portions.
Dependencies are inferred from the claim text.