A fiber-reinforced thermoplastic resin filament for a 3D printer is formed by impregnating a thermoplastic resin into a plurality of continuous reinforcing fibers, wherein: an average value S of a roundness parameter s of a cross section is 60% to 100%, the average value S being evaluated by (i) taking a photograph of the cross section perpendicular to the axial direction of the filament, (ii) drawing an inscribed circle and a circumscribed circle of the filament in a cross-sectional image and determining the diameter length of each, (iii) calculating the roundness parameter s defined by equation (1), and (iv) repeating (i)-(iii) at a plurality of locations on the filament and calculating the average value S of the roundness parameter s; and the coefficient of variation of the diameter length of the circumscribed circle is 0% to 10%.

A monofilament string for use in string racket sports, wherein the monofilament string comprises: a covering material; a core material embedded in the covering material, wherein the core material comprises: a sea region comprising a thermoplastic elastomer; and a plurality of island regions comprising a thermoplastic plastic doped with one or more doping agents, wherein the plurality of island regions is embedded in the sea region; and wherein a geometry and/or a distribution of the island regions in the sea region is such that a tangent modulus of a stress-strain curve of the monofilament string increases with increasing strain in a playing stress range.

A monofilament string for use in string racket sports, wherein the monofilament string comprises: a covering material; a core material embedded in the covering material, wherein the core material comprises: a sea region comprising a thermoplastic elastomer; and a plurality of island regions comprising a thermoplastic plastic doped with one or more doping agents, wherein the plurality of island regions is embedded in the sea region; and wherein a geometry and/or a distribution of the island regions in the sea region is such that a tangent modulus of a stress-strain curve of the monofilament string increases with increasing strain in a playing stress range.

The present invention relates to a new lithium ion battery separator and a manufacturing method therefor, composite fine-denier POY fibers with polypropylene PP acting as a core and alkali-soluble polyester COPET and polyethylene PE acting as a skin are produced by means of a chemical fiber composite spinning technology, wherein the COPET and PE are distributed as an islands-in-the-sea form, then the POY fibers are arranged as a fabric with a certain breadth by means of beam-warping, the fabric is subjected to stretching and hot-pressing by a hot roll such that the PE component having a low melting point is melted and joined to form a film, and then the COPET is dissolved away by means of an alkali solution such that a place where the COPET is present in the film become pores and PP fibers become the skeleton of the film, thus forming a lithium ion battery separator.

The invention relates to a monofilament for cutting vegetation, comprising: a matrix (1) made of a first material comprising at least one polyamide and at least two channels (2, 2a-2d) separately embedded in the matrix (1), the at least two channels being made of a second material different from the first material,
wherein the second material comprises at least one biopolymer and/or at least one recycled polymer.

An ultrafine fiber has a fiber diameter (D) of 100 to 5000 nm, a ratio (L/D) of a fiber length (L) to the fiber diameter (D) of 3000 to 6000, and a carboxyl terminal group amount of 40 eq/ton or more. At least a part of a surface layer of the ultrafine fiber may be formed of polyester.

A method of creating a soft and lofty continuous fiber nonwoven web is provided. The method includes providing a first molten polymer and a second, different molten polymer to a spinneret defining a plurality of orifices and flowing a fluid intermediate the spinneret and a moving porous member. The method includes using the fluid to draw the first and second molten polymer components, in a direction toward the moving porous member, through at least some of the plurality of orifices to form a plurality of individual continuous fiber strands. The method includes depositing the continuous fiber strands onto the moving porous member at a first location to produce an intermediate continuous fiber nonwoven web, and intermittently varying a vacuum force applied to the moving porous member and to the intermediate web downstream of the first location and without the addition of more continuous fibers and without any heat applied.

Disclosed is an artificial leather base material including: a non-woven fabric that is an entangle body of fibers (A) and fibers (B); and an elastic polymer applied inside the non-woven fabric, wherein the fibers (A) are crimped fibers that are formed from two types of resins with intrinsic viscosities different from each other, and that are filaments of 0.6 dtex or more, and the fibers (B) are ultrafine fibers of less than 0.6 dtex.

Disclosed herein are systems, devices, and method for forming bicomponent or multicomponent nanofibers.

Disclosed herein are systems, devices, and method for forming bicomponent or multicomponent nanofibers.