Abstract: A method of producing abrasive fibers is disclosed, which comprises providing a conjugate fiber comprising at least one abrasive layer containing abrasive particles and at least one coating layer substantially covering the abrasive layer, and removing at least a part of the coating layer from the conjugate fiber with a solvent or a decomposer to expose at least a part of the abrasive layer from the coating layer.

Abstract: A fur-like article having three dimensionally varied piles characterized in that at least one part of piles varies at least one of color, length and fineness along a surface, the distance of which varies with respect to a substrate fabric of said fibrous article is produced by rotating a fibrous structure having piles fixed on a supporting body to raise the piles owing to centrifugal force caused by the rotation and contacting the raised piles with a treating liquid for fibers which is retained in a rotary container and forms a cylindrical interface due to the centrifugal force, so that the distance of the interface of the treating liquid from a substrate fabric of said pile article varies according to place, to vary at least one of the color, length and fineness of the piles.

Abstract: Pile articles, such as artificial furs, wherein at least a part of piles is colored in at least two kinds of colorations which vary in the length direction of the piles, said color variation being caused on level surfaces distant substantially constantly from a substrate fabric of said pile articles over a broad area of said pile articles, are produced by rotating a fibrous structure having piles fixed on a rotating body to raise the piles owing to centrifugal force caused by the rotation and contacting the raised piles with a treating liquid for fibers retained in a rotary container wherein a cylindrical interface of the treating liquid is formed due to the centrifugal force. The pile articles wherein the piles are uniformly gradationally colored in the length direction of the piles are also produced by gradually moving the above described level surface.

Abstract: An apparatus for producing pile articles having complicated and high color tone and structure, such as artificial furs, writing brushes, brushes, etc. comprises a rotating body to which a pile article is fixed and which is rotated together with the pile article whereby centrifugal force is applied to the piles, a rotary container wherein at least one treating liquid for the above described piles is retained and at least one inner interface of the treating liquid is formed owing to the centrifugal force caused by the rotation to contact the piles with the treating liquid, and a feeding portion from which the treating liquid is fed into the rotary container and a discharging portion from which the treating liquid is discharged.

Abstract: Conductive composite filaments in which a conductive component composed of a synthetic thermoplastic fiber-forming polymer containing conductive carbon black and a non-conductive component composed of a synthetic thermoplastic fiber-forming polymer which is same as or different from the former polymer are continuously bonded in the longitudinal direction and in the cross-section the segments of the above described conductive component are radially extended to at least two directions and the segments of the above described non-conductive component fill between the conductive segments.

Abstract: Conductive composite filaments in which a conductive component composed of a synthetic thermoplastic fiber-forming polymer containing conductive carbon black and a non-conductive component composed of a synthetic thermoplastic fiber-forming polymer which is same as or different from the former polymer are continuously bonded in the longitudinal direction and in the cross-section the segments of the above described conductive component are radially extended to at least two directions and the segments of the above described non-conductive component fill between the conductive segments.