초록 ▼

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

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.

대표청구항 ▼

[What is claimed is:] [1.]a stem on and around which at least one spiral screw blade extends; anda 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 ter

[What is claimed is:] [1.]a stem on and around which at least one spiral screw blade extends; anda 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.