Stretchable meltblown fabric with barrier properties

摘要

A barrier fabric having stretch and recovery properties and a method of producing are disclosed. The method includes the steps of heating at least one nonwoven web containing meltblown non-elastic thermoplastic polymer fibers to a temperature at which the peak total energy absorbed by the nonwoven web of meltblown fibers is at least about 250 percent greater than the amount absorbed by the nonwoven web of meltblown fibers at room temperature; applying a tensioning force to neck the heated nonwoven web; and cooling the necked nonwoven web so that the nonwoven web has at least the same hydrostatic head and/or particulate barrier properties as the nonwoven web before necking. Also disclosed is a stretchable barrier fabric composed of a nonwoven web of meltblown non-elastomeric thermoplastic polymer fibers, the nonwoven web being heat treated so that it is adapted to stretch at least about 10 percent more than an identical untreated nonwoven web of meltblown non-elastomeric thermoplastic polymer fibers. The stretchable barrier fabric is adapted to provide a hydrostatic head of at least about 20 cm and/or a particle holdout efficiency of at least about 40 percent for particles having an average size greater than 0.1 mu m. The stretchable barrier fabric may be a component of a multilayer material and may be used in disposable protective garments.