a diaper is woven with an unfolded width of greater than about 40 inches , and is then folded along not fewer than three warp - direction fold lines in such a way that the central panel of the folded diaper includes at least four superposed layers while each side panel includes only one or two superposed layers . the number of filling yarns per inch in the diaper is considerably reduced , as compared to conventional diapers , thus providing an increase in production speed and hence a reduction in production cost , without decreasing the total thread count per square inch in , and absorbency of , the central panel .