A Design for Spinning Die Channel of Melt-Blown Nonwoven Fabric

Abstract

This paper has designed the T-channel, the fish-tail channel and the coat-hanger channel, and compared them separately. The conclusion has been obtained, which the coat-hanger channel conforms to the production technological requirement of melt-blown nonwoven fabric. In order to further confirm the coat-hanger channel design, the pressure and speed distribution of flow process which polymer melt flow in the channel have been simulated by ANSYS. The results indicated that the coat-hanger die channel conformed to the design requirement perfectly.

Advances in Melt Blowing Process Simulations

“…To produce uniform fibers on a large scale, it becomes necessary to have a feed distribution system capable of maintaining an even mass distribution and a uniform pressure of polymer across the feed area. 65 It is also desirable that the distribution system minimizes pressure losses to save input energy and be designed to minimize clogging while facilitating its cleaning. A metric used to track the effectiveness of the feed distribution is the evenness index (ideal case value is 1) which relies on its geometry and the non-Newtonian material properties but is independent of the polymer viscosity.…”

“…This lessens clogging by reducing the residence time of the polymer in the manifold area and controls the spread of the polymer in an even manner. 65 the coat-hanger model has a uniform pressure distribution and flow distribution along the exit of the system. 65 Meng et al simulated a double-width coat-hanger feed distribution system, having a series of multiple holes in line as shown in Figure 28, that would minimize pressure drop along the die thus lowering energy consumption.…”

“…65 the coat-hanger model has a uniform pressure distribution and flow distribution along the exit of the system. 65 Meng et al simulated a double-width coat-hanger feed distribution system, having a series of multiple holes in line as shown in Figure 28, that would minimize pressure drop along the die thus lowering energy consumption. 67 Their molten polymer was assumed to be an incompressible and isothermal non-Newtonian fluid with a pure viscous model.…”

“…To produce uniform fibers on a large scale, it becomes necessary to have a feed distribution system capable of maintaining an even mass distribution and a uniform pressure of polymer across the feed area . It is also desirable that the distribution system minimizes pressure losses to save input energy and be designed to minimize clogging while facilitating its cleaning.…”

“…It is also desirable that the distribution system minimizes pressure losses to save input energy and be designed to minimize clogging while facilitating its cleaning. A metric used to track the effectiveness of the feed distribution is the evenness index (ideal case value is 1) which relies on its geometry and the non-Newtonian material properties but is independent of the polymer viscosity . The performance of the feed distribution system can be studied using CFD simulations with feed distribution geometry and polymer properties as input parameters.…”