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Chapter 2. Flow in Sheeting Die |
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[Simulation Analysis for Polymer Processing by PC (2), Japan Plastics, Vol.49, No.12, P.86 (1998)]
As an example of analytical treatment of non-Newtonian flow, flow in sheeting die, such as T die and coat hanger die, is taken up. To be concrete, thickness distribution, pressure drop, die lip adjustment to attain even thickness of film are discussed. Among theories of sheeting die, a useful theory by McKelvey et al. [1] treats the fluid as isothermal power law. Before this theory, there were some theories of non-Newtonian flow in sheeting die, but they adopted rather simple die shapes or dimensions. In contrast, the theory of McKelvey et al. can be used when analyzing more complicated sheeting dies, and can apply to practical cases. [1] McKelvey, J. M. et al, Polym. Eng. & Sci., 11 (3), 258 ('71) |