A method of making nonwoven webs comprising providing a spinneret wherein the spinneret includes a pattern of conduits, the pattern of conduits forming an extrusion region; directing only a first stream of molten propylene polymer having a first temperature into a region adjacent of the first side of the spinneret, directing only a second stream of molten propylene polymer having a second temperature into a region distal to the first side of the spinneret, extruding only the first stream of molten propylene polymer through the exit openings in a first zone; extruding only the second stream of molten propylene polymer through the exit openings of a second zone; the second zone is distal to the first side with the first zone being between the second zone and the first side.

A spinneret (1) for electrostatic spinning is configured from a structure of an electrically conductive metal material. The structure is provided with a long-axis direction (X), a short-axis direction (Z), and a thickness direction (Y). An inflow port (10) for a spinning starting material fluid is provided to one surface of the structure. A plurality of protrusions (5) are formed on another surface of the structure so as to be aligned along the long-axis direction (X). Each of the plurality of protrusion (5) extends so as to protrude from the structure. The protrusions (5) have, provided to apexes (2) thereof, discharge holes (4) for discharging the starting material fluid. The pitch of the discharge holes (4) exceeds 1 mm.

A sea-island composite fiber includes island component fibers having a circumscribed circle diameter of 10 to 1000 nm, a circumscribed circle diameter variation of 1 to 20%, a non-circularity of 1.2 to 5.0, and a non-circularity variation of 1 to 10%.

A sea-island composite fiber includes island component fibers having a circumscribed circle diameter of 10 to 1000 nm, a circumscribed circle diameter variation of 1 to 20%, a non-circularity of 1.2 to 5.0, and a non-circularity variation of 1 to 10%.

A method for providing a multifilament bundle of melt spun polymer filaments, the that includes providing a spinning device including at least M extruders for melting M polymers, M groups of spinning stations, each group comprising N spinning stations, each spinning station comprising and a spin pack coupled to a spin pump which receives molten polymer from one of the M extruders and spins a strand of filaments by pushing said polymer through the coupled spin pack, and N transformation stations for bundling M strands of filaments. The method further includes spinning N*M strands of filaments from the spinning stations at a given spin pump output and bundling the strands into N multifilament bundles via the N transformation stations whereby the spin pump outputs are varied over time.

A method for providing a multifilament bundle of melt spun polymer filaments, the that includes providing a spinning device including at least M extruders for melting M polymers, M groups of spinning stations, each group comprising N spinning stations, each spinning station comprising and a spin pack coupled to a spin pump which receives molten polymer from one of the M extruders and spins a strand of filaments by pushing said polymer through the coupled spin pack, and N transformation stations for bundling M strands of filaments. The method further includes spinning N*M strands of filaments from the spinning stations at a given spin pump output and bundling the strands into N multifilament bundles via the N transformation stations whereby the spin pump outputs are varied over time.

A single-cavity multi-runner applied to oriented arrangement extrusion molding equipment of graphene fibers includes a first extrusion cavity, the first extrusion cavity includes a first inlet and a first outlet arranged opposite to each other; a first molding cavity, the first molding cavity is arranged in an inclined manner, a second inlet is arranged at the high position end, a second outlet is arranged at the low position end of the first molding cavity, and the second inlet is connected to the first outlet; flow channels, the flow channels are formed by dividing the first molding cavity using baffle plates arranged horizontally and along the flowing direction of a heat-conducting mixture; a second molding cavity, the second molding cavity includes a third inlet and a third outlet arranged opposite to each other, the third inlet is connected to the outflow end of the flow channels.

In an embodiment, a spinning head includes a head main body and a nozzle, and a storage cavity storing a material liquid is formed inside the head main body. The nozzle projects from an outer peripheral surface of the head main body, and an ejection port ejecting a material liquid is formed at a projection end. A flow path communicating with the storage cavity extends through an inside of the nozzle to the ejection port. The ejection port is located on an upper side of a vertical direction relative to the connecting part to the storage cavity, and at least a part of the flow path is tilted relative to a horizontal plane. An upper end of the connecting part of the flow path to the storage cavity is located at the same height as or on the upper side relative to an upper end of the storage cavity.

In an embodiment, a spinning head includes a head main body and a nozzle, and a storage cavity storing a material liquid is formed inside the head main body. The nozzle projects from an outer peripheral surface of the head main body, and an ejection port ejecting a material liquid is formed at a projection end. A flow path communicating with the storage cavity extends through an inside of the nozzle to the ejection port. The ejection port is located on an upper side of a vertical direction relative to the connecting part to the storage cavity, and at least a part of the flow path is tilted relative to a horizontal plane. An upper end of the connecting part of the flow path to the storage cavity is located at the same height as or on the upper side relative to an upper end of the storage cavity.

An electrospinning system, method, and apparatus comprises a dual polarity high voltage power supply with much less power out for safe operation, a solution dispensing assembly held at high positive potential by the dual polarity power supply, a Corona discharge assembly held at high negative potential by the dual polarity power supply, and a drum collector held at ground potential wherein a solution is drawn from the solution dispensing assembly to the drum collector thereby forming a fiber mat.