Abstract:

The coat-hanger die plays the role of distributing the molten polymer uniformly across its width so as to ensure the transverse uniformity of the product in the melt blowing process. This paper focused on the design of a broad- width coat-hanger die through combining multiple single dies. A single coat-hanger die was optimised first based on numerical simulation
and multi-membered evolution strategy. Subsequently two optimised coat-hanger dies were combined side by side. A satisfactory coefficient of variation value of 0.7828% at the combined die outlet was obtained through adjusting the position of the joint point. The results indicate the feasibility of designing broad- width coat-hanger die through combining multiple single dies.