This invention relates to a wound roll of fibrous nonwoven sheet structure comprising fibrous material, the fibrous nonwoven sheet structure suitable for subsequent embossing, the sheet structure being gas permeable, and having a first surface and a second surface; the first surface being surface bonded such that the fibrous material on the first surface has been substantially consolidated and stabilized by heat and pressure, and the second surface being capable of accepting printing, wherein the second surface has a smooth surface free of any embossing; the sheet structure having a particle barrier penetration of below 10%, a Gurley Hill Porosity of 40 seconds or less, and a moisture vapor transport rate of 3500 g/m.sup.2/day or greater.

A multilayer nonwoven fabric includes an elastic nonwoven fabric comprising an α-olefin copolymer having a ratio of a storage elastic modulus E40 at 40° C. and a storage elastic modulus E23 at 23° C. (E40/E23) is 37% or more, and an extensible spunbonded nonwoven fabric disposed on at least one side of the elastic nonwoven fabric.

A multilayer nonwoven fabric includes an elastic nonwoven fabric comprising an α-olefin copolymer having a ratio of a storage elastic modulus E40 at 40° C. and a storage elastic modulus E23 at 23° C. (E40/E23) is 37% or more, and an extensible spunbonded nonwoven fabric disposed on at least one side of the elastic nonwoven fabric.

The present invention discloses a centrifugal spinning apparatus, including a frame, a spinning device, a feeding device for providing a spinning solution to the spinning device, and a collection device for collecting centrifugal spinning fibers ejected by the spinning device. The collection device is horizontally disposed below the spinning device, to enable the centrifugal spinning fibers ejected by the spinning device to be attached to a surface of the collection device. A planar receiving-type centrifugal spinning automatic production device using the centrifugal spinning apparatus breaks through existing centrifugal spinning based on ring collection and centrifugal spinning technologies based on electrostatic collection, resolves a preparation problem of continuous filament of the centrifugal spinning, and achieves mass production of the centrifugal spinning. The whole production process is completed automatically without manual intervention.

The present invention discloses a centrifugal spinning apparatus, including a frame, a spinning device, a feeding device for providing a spinning solution to the spinning device, and a collection device for collecting centrifugal spinning fibers ejected by the spinning device. The collection device is horizontally disposed below the spinning device, to enable the centrifugal spinning fibers ejected by the spinning device to be attached to a surface of the collection device. A planar receiving-type centrifugal spinning automatic production device using the centrifugal spinning apparatus breaks through existing centrifugal spinning based on ring collection and centrifugal spinning technologies based on electrostatic collection, resolves a preparation problem of continuous filament of the centrifugal spinning, and achieves mass production of the centrifugal spinning. The whole production process is completed automatically without manual intervention.

A nonwoven web material is formed from fibers including a first polymer, a second polymer and a filler. The first polymer and second polymer may be olefin homopolymers and the filler may be calcium carbonate. The second polymer may have a lower melt flow rate than the first polymer. The fibers are formed in a monocomponent, i.e., monofilament, or multicomponent, e.g., sheath-core bicomponent, arrangement. The nonwoven web material may be used to form an article such as a medical product, a surgical product, a personal protective product, and/or an industrial garment.

A nonwoven web material is formed from fibers including a first polymer, a second polymer and a filler. The first polymer and second polymer may be olefin homopolymers and the filler may be calcium carbonate. The second polymer may have a lower melt flow rate than the first polymer. The fibers are formed in a monocomponent, i.e., monofilament, or multicomponent, e.g., sheath-core bicomponent, arrangement. The nonwoven web material may be used to form an article such as a medical product, a surgical product, a personal protective product, and/or an industrial garment.

Provided is a fiber web for a gas sensor. In one exemplary embodiment of the present invention, there is provided a fiber web for a gas sensor including nanofibers including a fiber-forming material and a sensing material for reacting with a target substance in a test gas. According to the exemplary embodiment, the fiber web for a gas sensor is capable of identifying the presence or absence of a target substance in a test gas and quantitatively determining the concentration of a target substance, and exhibits improved sensitivity due to having an increased area of contact and reaction with a target substance contained in a test gas. In addition, the fiber web for a gas sensor facilitates the detection of a target substance in a test gas at a low cost and thus can be widely used for the detection of various volatile organic compounds (VOCs) in households, the diagnosis of asthma or esophagitis or the identification of a patient suffering from the same, and the detection of hazardous materials in other fields of industrial safety.

Provided is a fiber web for a gas sensor. In one exemplary embodiment of the present invention, there is provided a fiber web for a gas sensor including nanofibers including a fiber-forming material and a sensing material for reacting with a target substance in a test gas. According to the exemplary embodiment, the fiber web for a gas sensor is capable of identifying the presence or absence of a target substance in a test gas and quantitatively determining the concentration of a target substance, and exhibits improved sensitivity due to having an increased area of contact and reaction with a target substance contained in a test gas. In addition, the fiber web for a gas sensor facilitates the detection of a target substance in a test gas at a low cost and thus can be widely used for the detection of various volatile organic compounds (VOCs) in households, the diagnosis of asthma or esophagitis or the identification of a patient suffering from the same, and the detection of hazardous materials in other fields of industrial safety.

The method for producing wet spun fibers/a wet formed film using a double-walled pipe type micronozzle apparatus according to the present invention is a production method, wherein, in a step of extruding an internal phase comprising a fiber/film material and a good solvent for the fiber/film material in a linear form from the circular/rectangular end of the internal pipe of the apparatus into an external phase comprising a poor solvent for the fiber/film material, the external phase flowing in the external pipe of the apparatus, the ratio of the external phase flow rate to the internal phase flow rate is set to 1 or more, and further for the wet spun fibers, the external phase line speed at the orifice portion at which the internal phase and the external phase merge is set to 0.1 ms.sup.−1 or more.