Monocomponent monolayer meltblown web and meltblowing apparatus

Details Monocomponent monolayer meltblown web and meltblowing apparatus Monocomponent monolayer meltblown web and meltblowing apparatus

2011-03-08

2011-03-08

Ortiz, Angela (Department: 1798)

Fabric (woven, knitted, or nonwoven textile or cloth, etc.)

Nonwoven fabric

Melt-blown nonwoven fabric

C442S334000, C442S340000, C442S344000, C442S401000

Reexamination Certificate

active

07902096

ABSTRACT:
A porous monocomponent nonwoven web contains a bimodal mass fraction/fiber size mixture of intermingled continuous microfibers and larger size fibers of the same polymeric composition. There are at least five times as many microfibers as larger size fibers, and a histogram of the mass fraction of fibers vs. fiber size exhibits a larger size fiber mode greater than 10 μm. The web may be made by flowing fiber-forming material through a die cavity having larger size orifices and at least five times as many smaller size orifices to form filaments, attenuating the filaments into fibers and collecting the attenuated fibers to form the nonwoven web. The web is especially well suited to the manufacture of self-supporting three dimensional articles such as molded cup-shaped respirators and pleated air filters.

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