Spun-blown non-woven web
AssigneeBiax-Fiberfilm Corporation
InventorsDouglas B. Brown, Jeffrey D. Stark, Mohammad A. Hassan
Life of this patent
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Abstract
A spun-blown non-woven web is disclosed which is formed from a plurality of fibers formed from a single polymer having an average fiber diameter ranging from between about 0.5 microns to about 50 microns; a basis weight of at least about 0.5 gsm; a tensile strength, measured in a machine direction, ranging from between about 20 g to about 4,200 g; a ratio of tensile strength, measured in the machine direction, to basis weight of at least about 20:1; and a ratio of percent elongation, measured in the machine direction, to fiber diameter of at least about 15.
Claims9
A nonwoven material comprising:
- a one-layer nonwoven web that includes:
- a plurality of fibers formed from a molten homopolymer having an average fiber diameter that is less than about 8 microns, the fibers defining groups of fiber diameters with each group defining a range of about ½ micron of variation with respect to each other and none of the groups of fiber diameters providing more than about 25% of the total fibers of the one-layer nonwoven web;
- a basis weight of at least about 1 gsm (grams per square meter);
- an extensibility characteristic determined by a percent elongation value, measured in a machine direction;
- a ratio of percent elongation, measured in the machine direction, to an average fiber diameter measured in microns of at least 9:1;
- a breaking force characteristic that corresponds to a machine direction tensile strength, measured in a machine direction;
- and
- a ratio of machine direction tensile strength to basis weight of between 25:1 to 50:1.
A nonwoven material comprising:
- a one-layer nonwoven web that includes:
- a plurality of fibers formed from a molten homopolymer having an average fiber diameter ranging from between about 1 micron to about 7.5 microns, the fibers defining groups of fiber diameters with none of the groups of fiber diameters providing more than about 25% of the total fibers of the one-layer nonwoven web;
- a basis weight of at least about 1 gsm (grams per square meter);
- a machine direction tensile strength, measured in a machine direction, and defining a maximum machine direction tensile strength;
- a cross direction tensile strength, measured in a cross direction, and defining a maximum cross direction tensile strength that is less than the maximum machine direction tensile strength;
- and
- a unimodal fiber size distribution that defines a number of fibers having a diameter greater than or equal to the distribution's mode plus one standard deviation but less than the distributions mode plus two standard deviations is at least 40% of the number of fibers having a diameter greater than or equal to the distribution's mode but less than the distribution's mode plus one standard deviation.
Dependencies are inferred from the claim text.