The present utility model discloses an extruder screw with variable land width and variable pitch, comprising a screw body and a flight. The pitch Tn and the flight land width Bn of the flight continuously decrease from the feed end to the discharge end of the screw body, following the formulas: Tn = To – ΔT·n; Bn = Bo – ΔB·n. Where ΔT is the change rate of the extrusion pitch, and ΔB is the change rate of the flight land width. The extrusion pitch change rate ΔT ranges from 1.10 to 1.20, To is the pitch of the first adjacent flight tooth at the feed end of the flight, and Tn is the pitch of the nth adjacent flight tooth. The flight land width change rate ΔB ranges from 0.32 to 0.33, Bo is the flight land width of the first adjacent flight tooth at the feed end of the flight, and Bn is the flight land width of the nth adjacent flight tooth. The extruder screw of the present utility model has the characteristics of stable extrusion pressure build-up, uniform plasticization of rubber compound, and excellent dispersibility, and is particularly suitable for twin-screw extruders for extrusion film-forming of solar cell encapsulation films.
Country Code: CN
Application Number: CN202322990333.0
