A device for manufacturing a chopped fiber bundle includes a cutter roll provided with one or more disk blades on a circumference of a roll core having a center axis coinciding with a rotation axis of the roll core and a nip roll provided in parallel with the rotation axis of the roll core, to feed a reinforcing fiber yarn to be continuously cut between the nip roll and the cutter roll, further including a rotary drive mechanism that rotates the cutter roll and at least one of: a reciprocating drive mechanism that reciprocates the cutter roll along the rotation axis of the roll core; and a traverse guide that traverses the reinforcing fiber yarn along the rotation axis of the roll core.

A device for manufacturing a chopped fiber bundle includes a cutter roll provided with one or more disk blades on a circumference of a roll core having a center axis coinciding with a rotation axis of the roll core and a nip roll provided in parallel with the rotation axis of the roll core, to feed a reinforcing fiber yarn to be continuously cut between the nip roll and the cutter roll, further including a rotary drive mechanism that rotates the cutter roll and at least one of: a reciprocating drive mechanism that reciprocates the cutter roll along the rotation axis of the roll core; and a traverse guide that traverses the reinforcing fiber yarn along the rotation axis of the roll core.

Manufacturing a spun-dyed para-aramid filament yarn includes (a) preparing a spin dope comprising a para-aramid polymer, at least one dyestuff and concentrated sulfuric acid, (b) spinning the spin dope through a spinneret to obtain spun filaments, (c) coagulating the spun filaments to obtain coagulated filaments, (d) neutralizing the coagulated filaments to obtain neutralized filaments, (e) washing the neutralized filaments to obtain washed filaments, and (f) drying the washed filaments to obtain dried filaments. In step a) the spin dope includes 17.5 to 18.5% by weight of a para-aramid polymer with respect to the weight of the spin dope, and 4 to 15% by weight of the at least one dyestuff with respect to the weight of the para-aramid polymer plus the at least one dyestuff. In step f) the filaments are hold under a tension in a range from 0.2 to 0.8 cN/dtex.

The present invention belongs to the technical field of wig production and specifically relates to a manufacturing method for layered hairpiece product. The manufacturing method for preparing layered hairpiece product comprises the following steps: step I. preparing a raw hairpiece; step II. cutting a manufacturing unit: cutting one or more manufacturing units having a trapezoidal shape from the raw hairpiece; and step III. homogeneously mixing each manufacturing unit. In the present invention, after cutting the layered part having a trapezoidal shape and mixing the same homogeneously, the layered part of the layered hairpiece product resembles a natural look at the hair ends with high similarity to real hairs.

The present invention belongs to the technical field of wig production and specifically relates to a manufacturing method for layered hairpiece product. The manufacturing method for preparing layered hairpiece product comprises the following steps: step I. preparing a raw hairpiece; step II. cutting a manufacturing unit: cutting one or more manufacturing units having a trapezoidal shape from the raw hairpiece; and step III. homogeneously mixing each manufacturing unit. In the present invention, after cutting the layered part having a trapezoidal shape and mixing the same homogeneously, the layered part of the layered hairpiece product resembles a natural look at the hair ends with high similarity to real hairs.

A process for utilizing wound packages of off-color filament yarn by: a) obtaining a plurality of wound packages of off-color filament yarn: b) classifying the plurality of wound packages, based on a pigment in the filament, into sets of wound packages; c) converting a first set of wound packages into first staple fibers; d) converting a second set of wound packages into second staple fibers; e) mixing the first and second staple fibers of c) and d) to form an intimate blend of off-color staple fibers;
wherein the first staple fibers are at least 55 weight percent of the off-color staple fibers in the intimate blend of off-color staple fibers.