Abstract: A spinning nozzle which has a perforated part in which ejection holes have been arranged in a density as high as 600-1,200 holes/mm2. This process for producing a fibrous bundle comprises ejecting a spinning dope having a viscosity as measured at 50° C. of 30-200 P from the ejection holes of the spinning nozzle to produce a fibrous bundle. This fibrous bundle has a single-fiber fineness of 0.005-0.01 dtex. By the wet-process direct spinning, a mass of nanofibers which are stably uniform and continuous can be produced at a high efficiency.

Abstract: Provided is a fiber having superior bulkiness despite being a synthetic fiber, and wadding. The fiber contains inorganic particles having an average particle diameter of 1 ?m to 20 ?m within the fiber and fiber pores having a maximum width of 0.1 ?m to 5 ?m and maximum length of 1 ?m to 50 ?m are formed in fiber cross-sections in the axial direction of the fiber. The wadding contains a fiber A, and the content of fiber A in the wadding (100% by weight) is 50% by weight to 100% by weight, down power is 270 cm3/g to 400 cm3/g, and the fiber A contains inorganic particles having an average particle diameter of 1 ?m to 20 ?m within the fiber.

Abstract: Wadding of the present invention is obtained by mixing 20% by mass or more and 95% by mass or less of an acrylic fiber and 5% by mass or more and 80% by mass or less of a polyester fiber, in which a down power is 140 cm3/g or more and 300 cm3/g or less, and a warmth retention property (Clo value) is 3.7 or more and 5 or less.

Abstract: A spinning nozzle which has a perforated part in which ejection holes have been arranged in a density as high as 600-1,200 holes/mm2. This process for producing a fibrous bundle comprises ejecting a spinning dope having a viscosity as measured at 50° C. of 30-200 P from the ejection holes of the spinning nozzle to produce a fibrous bundle. This fibrous bundle has a single-fiber fineness of 0.005-0.01 dtex. By the wet-process direct spinning, a mass of nanofibers which are stably uniform and continuous can be produced at a high efficiency.

Abstract: A spinning nozzle which has a perforated part in which ejection holes have been arranged in a density as high as 600-1,200 holes/mm2. This process for producing a fibrous bundle comprises ejecting a spinning dope having a viscosity as measured at 50° C. of 30-200 P from the ejection holes of the spinning nozzle to produce a fibrous bundle. This fibrous bundle has a single-fiber fineness of 0.005-0.01 dtex. By the wet-process direct spinning, a mass of nanofibers which are stably uniform and continuous can be produced at a high efficiency.

Abstract: The present invention provides: an acrylic fiber having a fineness of 0.5 to 3.5 dtex and having excellent gloss, pilling resistance, and texture; a method for producing said acrylic fiber; and a spun yarn and a knitted fabric containing said acrylic fiber. Provided is an acrylic fiber having a filament fineness of 0.5 to 3.5 dtex, wherein the product K of the value of knot strength (cN/dtex) and the value of knot elongation (%) is from 8 to 30 inclusive, and the number of recesses having a depth of 0.1 ?m or greater is 10 or fewer.

Abstract: The present invention relates to wadding in which short fibers (A) having a single fiber fineness (a) of 0.001-1.0 dtex make up 5-90 mass % of the total mass of the wadding. Measured in accordance with JIS L 1096 Warmth Retention Method A (Constant-Temperature Method):2010, a 89% or higher warmth retention ratio is obtained in test items made by stuffing 100 g of the wadding substantially evenly into a pouch-shaped cover produced by layering two pieces of 45 cm-length 100% cotton fabric squares and thereafter sewing shut the opening of the pouch-shaped cover. By means of the present invention, it is possible to provide wadding which has excellent softness and bulkiness and which is ideal for use in down jackets, duvets or other bedding.

Abstract: A fine-concave-convex transfer mold with which defect regions of a molded body having a fine-concave-convex structure can be easily identified, and deformation of the fine-concave-convex structure can be inhibited even if the molded product is wound. A mold for the production of an optical article has, provided to a surface thereof, a plurality of convex portions at a cycle equal to or less than the wavelengths of visible light, and a plurality of concave portions formed between the adjacent convex portions. The mold has a surface provided with a transfer area having concave portions and convex portions that have a size and shape complementing the convex portions and the concave portions of the optical article. The mold can include, in the transfer area, marking portions. The height of the convex portions in the transfer area is less than the height of convex portions in sections other than the transfer area.

Abstract: A spinning nozzle which has a perforated part in which ejection holes have been arranged in a density as high as 600-1,200 holes/mm2. This process for producing a fibrous bundle comprises ejecting a spinning dope having a viscosity as measured at 50° C. of 30-200 P from the ejection holes of the spinning nozzle to produce a fibrous bundle. This fibrous bundle has a single-fiber fineness of 0.005-0.01 dtex. By the wet-process direct spinning, a mass of nanofibers which are stably uniform and continuous can be produced at a high efficiency.

Abstract: A fine-concave-convex transfer mold with which defect regions of a molded body having a fine-concave-convex structure can be easily identified, and deformation of the fine-concave-convex structure can be inhibited even if the molded product is wound. A mold for the production of an optical article has, provided to a surface thereof, a plurality of convex portions at a cycle equal to or less than the wavelengths of visible light, and a plurality of concave portions formed between the adjacent convex portions. The mold has a surface provided with a transfer area having concave portions and convex portions that have a size and shape complementing the convex portions and the concave portions of the optical article. The mold can include, in the transfer area, marking portions. The height of the convex portions in the transfer area is less than the height of convex portions in sections other than the transfer area.