Provided is a useful improvement in a CF-SMC manufacturing technique comprising an SMC manufacturing method using a continuous carbon fiber bundle having a filament number of NK and partially split into n sub-bundles in advance. In the SMC manufacturing method according to the present invention, a fragmentation processing using a fragmentation processing apparatus (A) below is performed on chopped carbon fiber bundles before being deposited on a carrier film. The fragmentation processing apparatus (A) comprises a first pin roller and a second pin roller, each of which has a rotation axis parallel to a rotation axis direction of the rotary cutter. The first pin roller is rotationally driven such that its pins move downward from above on its side facing the second pin roller, and the second pin roller is rotationally driven such that its pins move downward from above on its side facing the first pin roller.

Provided is a useful improvement in a CF-SMC manufacturing technique comprising an SMC manufacturing method using a continuous carbon fiber bundle having a filament number of NK and partially split into n sub-bundles in advance. In the SMC manufacturing method according to the present invention, a fragmentation processing using a fragmentation processing apparatus (A) below is performed on chopped carbon fiber bundles before being deposited on a carrier film. The fragmentation processing apparatus (A) comprises a first pin roller and a second pin roller, each of which has a rotation axis parallel to a rotation axis direction of the rotary cutter. The first pin roller is rotationally driven such that its pins move downward from above on its side facing the second pin roller, and the second pin roller is rotationally driven such that its pins move downward from above on its side facing the first pin roller.

Problem: To provide a method for manufacturing metal staple fibers that allows for the efficient manufacture of uniform metal staple fibers. Solution: A method for manufacturing metal staple fibers including a cutting step of cutting a metal fiber bundle coated with a fluorine-based polymer into a staple fiber bundle.

A chopper assembly for cutting filaments in a strand into short lengths, comprising two rolls (1,4) being rotatable in opposite directions and having a pinch where the rolls (1,4) contact each other. At least one of the rolls (1,4) is provided with cutting blades (2,5) at its cylindrical outer surface. Means (15) are present for guiding said strand to said pinch where the filaments of the strand are cut. Both axes of rotation (16,17) of the rolls (1,4) are parallel to the tangential plane through said pinch and make an angle (α) with each other, so that the cutting blades (2,5) move in axial direction with respect to each other in the pinch.

A chopper assembly for cutting filaments in a strand into short lengths, comprising two rolls (1,4) being rotatable in opposite directions and having a pinch where the rolls (1,4) contact each other. At least one of the rolls (1,4) is provided with cutting blades (2,5) at its cylindrical outer surface. Means (15) are present for guiding said strand to said pinch where the filaments of the strand are cut. Both axes of rotation (16,17) of the rolls (1,4) are parallel to the tangential plane through said pinch and make an angle (α) with each other, so that the cutting blades (2,5) move in axial direction with respect to each other in the pinch.

The application relates to a method and apparatus for manufacturing a natural fiber based staple fibers. The application further relates to the staple fibers, staple fiber based raw wool and products comprising such. A method comprises providing a cellulose suspension (101, 310, 510) including water, refined cellulose fibrils and at least one rheology modifier, directing the cellulose suspension through a nozzle (102, 320, 520) onto a surface (300, 400, 500), drying the cellulose suspension onto the surface (103, 300, 400, 500) for forming a fiber (350, 550), and cutting the cellulose suspension on the surface for forming staple fibers (105).

The application relates to a method and apparatus for manufacturing a natural fiber based staple fibers. The application further relates to the staple fibers, staple fiber based raw wool and products comprising such. A method comprises providing a cellulose suspension (101, 310, 510) including water, refined cellulose fibrils and at least one rheology modifier, directing the cellulose suspension through a nozzle (102, 320, 520) onto a surface (300, 400, 500), drying the cellulose suspension onto the surface (103, 300, 400, 500) for forming a fiber (350, 550), and cutting the cellulose suspension on the surface for forming staple fibers (105).

A process for debundling a carbon fiber tow into dispersed chopped carbon fibers suitable for usage in molding composition formulations is provided. A carbon fiber tow is fed into a die having fluid flow openings, through which a fluid impinges upon the side of the tow to expand the tow cross sectional area. The expanded cross sectional area tow extends from the die into the path of a conventional fiber chopping apparatus to form chopped carbon fibers, or through contacting tines of a mechanical debundler. Through adjustment of the relative position of fluid flow openings relative to a die bore through which fiber tow passes, the nature of the fluid impinging on the tow, the shape of the bore, in combinations thereof, an improved chopped carbon fiber dispersion is achieved. The chopped carbon fiber obtained is then available to be dispersed in molding composition formulations prior to formulation cure.

A process for debundling a carbon fiber tow into dispersed chopped carbon fibers suitable for usage in molding composition formulations is provided. A carbon fiber tow is fed into a die having fluid flow openings, through which a fluid impinges upon the side of the tow to expand the tow cross sectional area. The expanded cross sectional area tow extends from the die into the path of a conventional fiber chopping apparatus to form chopped carbon fibers, or through contacting tines of a mechanical debundler. Through adjustment of the relative position of fluid flow openings relative to a die bore through which fiber tow passes, the nature of the fluid impinging on the tow, the shape of the bore, in combinations thereof, an improved chopped carbon fiber dispersion is achieved. The chopped carbon fiber obtained is then available to be dispersed in molding composition formulations prior to formulation cure.

A fabric material includes a plurality of synthetic yarns, the yarns including staple fibers having a range of denier values. The polyester staple fibers have deniers ranging from about 0.5 denier per filament to about 2.0 denier per filament. Additionally, more than 50% of the staple fibers present in the fabric possess a length of greater than 1 inch.