Die tip for melt blowing micro- and nano-fibers

摘要

A melt-blowing die tip includes a first die tip half and a second die tip half with complementary mating surfaces. A flow system is engraved onto at least one of the mating surfaces. The flow system includes linear melt troughs, which are fluidly connected by channels. Spinning orifices downstream of the last melt trough, which may have diameters over an exceptionally broad range, produce fibers as small as nano-scale. Fasteners secure the two die tip halves, and at least one of the channels includes a curved portion to direct flow around a fastener. The resulting die tip has increased pressure tolerance, greater productivity, reduced costs, and supports the economical mass production of super fine fibers. Optionally, an engraved die plate may be inserted between the die tip halves. When both sides of the die plate are engraved with a flow system, the die may produce bi-component fibers.

主权项

1. A melt-blowing die tip comprising:
a first die tip half having a first mating surface; a second die tip half, the second die tip half having a second mating surface complementary to the first mating surface; a flow system engraved onto at least one of the first mating surface and the second mating surface, the flow system comprising:
a first melt trough and a second melt trough parallel to the first melt trough;a plurality of primary channels fluidly connecting the first melt trough to the second melt trough; anda plurality of spinning orifices disposed downstream of and fluidly connected to the second melt trough for producing melt-blown fibers; and a plurality of fasteners securing the first die tip half to the second die tip half; wherein at least one of the primary channels in the flow system includes a curved portion to direct flow around at least one of the fasteners.