Abstract: A nonwoven fabric for curtain in an embodiment of the present invention is formed from fibers having a thermoplastic resin as a main component, said nonwoven fabric for curtain being characterized in that: in the surface of the nonwoven fabric, the fibers are fused together at points where the fibers intersect, and the fibers are mutually isolated at locations other than the intersecting points; and furthermore, the KES surface roughness SMD of at least one side of the sheet is 1.2 ?m or less, and the longitudinal tearing strength per fabric weight is 0.50 or more.

Abstract: Provided is a spunbound nonwoven fabric for use in filters which has excellent rigidty, folding endurance, and uniformity of a weight a unit area, and which also has dust collection perforance and mechanical properties. The spunbond nonwoven fabric for use in filters includes a thermoplastic continuous filament and has a partially fused portion. The nonwoven fabric has a stiffness of 2 mN or more and 100 mN or less, a weight per unit area-CV value 5% or less, and a weight per unit area of 150 g/m2 more and 300 g/m2 or less.

Abstract: A nonwoven fabric for curtain in an embodiment of the present invention is formed from fibers having a thermoplastic resin as a main component, said nonwoven fabric for curtain being characterized in that: in the surface of the nonwoven fabric, the fibers are fused together at points where the fibers intersect, and the fibers are mutually isolated at locations other than the intersecting points; and furthermore, the KES surface roughness SMD of at least one side of the sheet is 1.2 ?m or less, and the longitudinal tearing strength per fabric weight is 0.50 or more.

Abstract: An object of the present invention is to provide an electret nonwoven fabric that includes thin fibers and in which fusion between fibers is controlled so that the electret nonwoven fabric may have high collection efficiency, low pressure loss, and high strength, and an air filter material including the electret nonwoven fabric. The nonwoven fabric of the present invention is a nonwoven fabric including a constituent fiber containing a thermoplastic resin, the constituent fiber containing at least a first component and a second component, either one or both of the first component and the second component containing a crystal nucleating agent, the first component and the second component having a difference in crystallization start temperature of 5° C. or more, at least part of both the first component and the second component being exposed to a surface of the constituent fiber.

Abstract: A spunbonded nonwoven fabric of the present invention is characterized by being composed of a polyolefin fiber, wherein the average pore diameter of the nonwoven fabric surface is 0.1-25 ?m, the maximum pore diameter is 50 ?m or less, and the water pressure resistance per unit basis weight is 7 mmH2O/(g/m2) or more.

Abstract: A process for producing a spunbonded nonwoven fabric includes ejecting a continuous fiber group from a spinneret, thinning and stretching the continuous fiber group with a rectangular ejector, and collecting the continuous fiber group in a nonwoven fabric form. The rectangular ejector has a jetting hole part having a slit width regulation member. A plurality of minute-deformation unit is disposed along a long-side direction of the slit width regulation member. A nonwoven fabric which has been collected is examined to determine a basis-weight distribution thereof in a width direction and the slit width regulation member is partly and minutely deformed by the minute-deformation unit on the basis of a determined value thereof to partly change a slit width of the jetting hole by its minute deformation, thereby regulating a basis-weight distribution thereof.

Abstract: A nonwoven fabric has excellent mechanical strength in addition to workability stabled with a high yield even with respect to heat applied when forming a membrane and manufacturing a fluid separation element, when the nonwoven fabric is used as a support for a separation membrane such as a reverse osmosis membrane. The nonwoven fabric has two surfaces having a difference in smoothness therebetween of 10 seconds to 50 seconds, and a boiling water curling height after treating in boiling water for 5 minutes of 0 mm to 8.0 mm.

Abstract: Provided are a composite fiber which consists primarily of resins comprising polyphenylene sulfide as their main constituents and which has both thermal dimensional stability and excellent thermal bondability, and a nonwoven fabric. The composite fiber consists primarily of component A and component B, the component A being a resin that includes polyphenylene sulfide as its main constituent, the component B being a resin that includes polyphenylene sulfide as its main constituent, having a higher melt flow rate than the component A, and forming at least part of the surface of the fiber.

Abstract: A separation membrane support includes a nonwoven fabric and has excellent membrane formability that achieves a high and stable yield when the separation membrane support supports various separation membranes, having excellent processability when a fluid separation element is produced, and having excellent mechanical strength. The nonwoven fabric has a boiling water shrinkage of ?0.2 to 2.0% in the length direction (longitudinal direction) after treatment in boiling water for 5 minutes.

Abstract: A production method for a filament non-woven fabric includes a) obtaining filaments having a crystallization temperature not exceeding 112° C. by melting a resin containing polyethylene sulfide as a main component which is not substantially copolymerized with trichlorobenzene; b) pulling and drawing fiber threads formed by discharging the melted resin from spinning nozzles at a spinning speed of at least 5,000 m/min and less than 6,000 m/min by an ejector disposed such that a distance between a bottom face of the spinning nozzles and a compressed air emission outlet of the ejector is 450-650 mm; c) collecting obtained filaments on a moving net, forming a non-woven web; and d) thermocompression bonding the obtained non-woven web using a heating roller.

Abstract: A support for a separation membrane includes a long-fiber nonwoven fabric composed of thermoplastic continuous filaments.

Abstract: A production method for a filament non-woven fabric includes a) obtaining filaments having a crystallization temperature not exceeding 112° C. by melting a resin containing polyethylene sulfide as a main component which is not substantially copolymerized with trichlorobenzene; b) pulling and drawing fiber threads formed by discharging the melted resin from spinning nozzles at a spinning speed of at least 5,000 m/min and less than 6,000 m/min by an ejector disposed such that a distance between a bottom face of the spinning nozzles and a compressed air emission outlet of the ejector is 450-650 mm; c) collecting obtained filaments on a moving net, forming a non-woven web; and d) thermocompression bonding the obtained non-woven web using a heating roller.

Abstract: A support for a separation membrane includes a long-fiber nonwoven fabric composed of thermoplastic continuous filaments.