An elastic fiber treatment agent that contains, as a smoothing agent, a mineral oil with a content ratio of an aromatic component of less than 1% by mass and an aniline point of 70° C. to 110° C. The mineral oil has a mass ratio between the content of a naphthene component and the content of a paraffin component of such that naphthene component/paraffin component=30 to 50/70 to 50.

A welding process may be configured to convert a substrate into a welded substrate by applying a process solvent to the substrate, wherein the process solvent interrupts one or more intermolecular force between one or more component in the substrate. The substrate may be configured as a natural fiber, such as cellulose, hemicelluloses, and silk. The process solvent may be configured as an ionic-liquid based solvent and the welded substrate may be a congealed network after the process solvent has been adequately swollen and/or mobilized the substrate. A welding process may be configured such that individual fibers of a substrate are not fully dissolved such that material in the fiber core may be left in the native state by controlling process variables. The welding process fibers may have a tenacity 10% or 20% greater or a diameter 25% less than that of a cellulosic-based yarn substrate.

The present invention relates to methods of producing polymer fibers and polymer fiber products and materials recovery from these processes. It is an object of this invention to produce polymer fibers and products that include these fibers using selective dissolution of multicomponent fiber and to recover the dissolved polymer and solvent for subsequent use.

According to one embodiment, a fiber sheet includes a plurality of fibers. The plurality of fibers are in a closely-adhered state. All of the following (1) to (3) are satisfied, where F1 is a tensile strength in a first direction, and F2 is a tensile strength in a second direction orthogonal to the first direction: (1) F2>F1; (2) F1 is 1 MPa or more; and (3) F2/F1 is 2 or more.

A coated microfibrous web, a method for producing the same, the use thereof as a covering of a radiation protection material, and a radiation protection device are described. The coated microfibrous web contains: (i) a microfibrous web containing one or more polyesters and/or one or more polyamides and/or one or more polyamide-polyester copolymers and having an impregnation composition containing (a) an aromatic dicarboxylic acid, the dicarboxylic groups of which are each esterified with a diol, and/or (b) one or more oligomers, each containing 2 to 10 repeat units consisting of a monoester of an aromatic dicarboxylic acid impregnated with a diol; and (ii) a layer comprising polyurethane which is present only on one side of the microfibrous web.

The present invention relates to methods of producing polymer fibers and polymer fiber products and materials recovery from these processes. It is an object of this invention to produce polymer fibers and products that include these fibers using selective dissolution of multicomponent fiber and to recover the dissolved polymer and solvent for subsequent use.

A process is disclosed for modifying citrus fiber. Citrus fiber is obtained having a c* close packing concentration value of less than 3.8 w %, anhydrous basis. The citrus fiber can have a viscosity of at least 1000 mPa.Math.s, wherein said citrus fiber is dispersed in standardized water at a mixing speed of from 800 rpm to 1000 rpm, to a 3 w/w % citrus fiber/standardized water solution, and wherein said viscosity is measured at a shear rate of 5 s-1 at 20 C. Citrus fiber can be obtained having a CIELAB L* value of at least 90. The citrus fiber can be used in food products, feed products, beverages, personal care products, pharmaceutical products or detergent products.

The present invention provides a modified fibroin fiber having a shrinkage history of being irreversibly shrunk after spinning, the modified fibroin fiber containing modified fibroin, wherein a fiber diameter of a raw material fiber before being irreversibly shrunk exceeds 25 μm.

The present disclosure provides a method for producing a cell-culturing polyvinyl alcohol-based nanofiber structure, the method comprising: electrospinning an electrospun solution to form a nanofiber mat, wherein the electrospun solution contains polyvinyl alcohol (PVA), polyacrylic acid (PA) and glutaraldehyde (GA); crosslinking the nanofiber mat via a hydrochloric acid (HCl) vapor treatment; and treating the crosslinked nanofiber mat with dimethylformamide (DMF) solvent to crystallize the nanofiber mat.

The embodiment relates to a method for preparing a graphite sheet having a high thermal conductivity at a low cost without using an expensive polyimide film.