PAPER WEB HAVING A LIQUID IMPERMEABLE, BREATHABLE BARRIER LAYER

摘要

A MULTIPLE PLY PAPER WEB (10) COMPRISING AT LEAST ONE OUTER CELLULOSIC PLY (30), PREFERABLY TWO OUTER CELLULOSIC PLIES (30) PASSIVELY BONDED TO AT LEAST ONE INNER PLY (20). THE INNER PLY CAN BE COMPRISED OF MELTBLOWN FIBERS FORMED INTO A LIQUID-IMPERMEABLE, BREATHEABLE NONWOVEN WEB. THE TISSUE PLIES CAN BE CREPED TISSUE PAPER HAVING A BASIS WEIGHT OF FROM ABOUT 10G/M2 TO ABOUT 100G/M2, PREFERABLY FROM ABOUT 15G/M2 TO ABOUT 25G/M2. IN A PREFERRED EMBODIMENT, THE MELTBLOWN FIBERS OF THE INNER PLY COMPRISE POLYPROPYLENE FIBERS HAVING AN AVERAGE DIAMETER OF LESS THAN ABOUT 10 MICROS, AND MORE PREFERABLY LESS THAN ABOUT 2.5 MICRONS. THE NONWOVEN WEB CAN HAVE A BASIS WEIGHT FROM ABOUT 1G/M2 TO ABOUT 15G/M2, PREFERABLY FROM ABOUT 1G/M2 TO ABOUT 10G/M2, AND MORE PREFERABLY FROM ABOUT 1G/M2 TO ABOUT 8G/M2. IN A PREFERRED EMBODIMENT THE INNER PLY HAS A MOISTURE VAPOR TRANSMISSION RATE OF AT LEAST ABOUT 4000, AND CAN HOLD A HYDROSTATIC HEAD OF AT LEAST ABOUT 20MM H2O.