MELTBLOWING APPARATUS EMPLOYING PLANETARY GEAR METERING PUMP.

摘要

Melt blown nonwoven webs are formed by supplying fiber-forming material to a planetary gear metering pump (21) having a plurality of outlets (22a-d) flowing fiber-forming material from the pump outlets through a plurality of inlets(24a-d) in one or more die cavities(25), and meltblowing the fiber-forming material. Each die cavity inlet receives a fiber-forming material stream having a similar thermal history. The physical or chemical properties of the nonwoven web fibers such as their average molecular weight and polydispersity can be made more uniform. Wide nonwoven webs can be formed by arranging a plurality of such die cavities in a side-by-side relationship. Thicker or multilayered nonwoven webs can be formed by arranging a plurality of such die cavities atop one another.