Non‐isothermal flow is simulated in the screw and kneading disc elements in a modular co‐rotating twin screw extruder. Methods of calculating mean temperature rises for individual elements are discussed and results are presented. The implications of non‐isothermal operation for scale‐up is discussed. A method is then described for making calculations in a modular co‐rotating machine, that contains many different elements. Example calculations are given showing the tendency of larger machines to build…
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