Processes for making high-performance polyethylene multi-filament yarn are disclosed which include the steps of a) making a solution of ultra-high molar mass polyethylene in a solvent; b) spinning of the solution through a spinplate containing at least 5 spinholes into an air-gap to form fluid filaments, while applying a draw ratio DR.sub.fluid; c) cooling the fluid filaments to form solvent-containing gel filaments; d) removing at least partly the solvent from the filaments; and e) drawing the filaments in at least one step before, during and/or after said solvent removing, while applying a draw ratio DR.sub.solid of at least 4, wherein in step b) each spinhole comprises a contraction zone of specific dimension and a downstream zone of diameter Dn and length Dn with Ln/Dn of from 0 to at most 25, to result in a draw ratio DR.sub.fluid=DR.sub.sp*DR.sub.ag of at least 150, wherein DR.sub.sp is the draw ratio in the spinholes and DR.sub.ag is the draw ratio in the air-gap, with DR.sub.sp being greater than 1 and DR.sub.ag at least 1. High-performance polyethylene multifilament yarn, and semi-finished or end-use products containing said yarn, especially to ropes and ballistic-resistant composites, are also disclosed.

A medical appliance or prosthesis may comprise one or more layers of rotational spun nanofibers, including rotational spun polymers. The rotational spun material may comprise layers including layers of polytetrafluoroethylene (PTFE). Rotational spun nanofiber mats of certain porosities may permit tissue ingrowth into or attachment to the prosthesis. Additionally, one or more cuffs may be configured to allow tissue ingrowth to anchor the prosthesis.

A medical appliance or prosthesis may comprise one or more layers of rotational spun nanofibers, including rotational spun polymers. The rotational spun material may comprise layers including layers of polytetrafluoroethylene (PTFE). Rotational spun nanofiber mats of certain porosities may permit tissue ingrowth into or attachment to the prosthesis. Additionally, one or more cuffs may be configured to allow tissue ingrowth to anchor the prosthesis.

An apparatus for producing fibers from molten material includes a drive shaft rotatable about an axis, a slinger basket including a base, a side wall, and an interior void. The side wall extends axially upward from the base and includes a plurality of distribution holes. The interior void extends radially from the drive shaft to the side wall and extends axially from the base to an upper opening which extends radially outward from the drive shaft toward the upper flange. A spinner body is coupled with the slinger basket and includes a roof contacting and extending radially outward from the upper flange such that the upper opening is substantially unobstructed by the spinner body. A spinner side wall extends axially downward from the roof and includes a fiberizing region including a plurality of fiberizing holes provided therein.

An apparatus for producing fibers from molten material includes a drive shaft rotatable about an axis, a slinger basket including a base, a side wall, and an interior void. The side wall extends axially upward from the base and includes a plurality of distribution holes. The interior void extends radially from the drive shaft to the side wall and extends axially from the base to an upper opening which extends radially outward from the drive shaft toward the upper flange. A spinner body is coupled with the slinger basket and includes a roof contacting and extending radially outward from the upper flange such that the upper opening is substantially unobstructed by the spinner body. A spinner side wall extends axially downward from the roof and includes a fiberizing region including a plurality of fiberizing holes provided therein.

The present disclosure is directed toward an improved nanofibrous electret filtration media of which the stand-alone electret nanofibrous web comprises a single source randomly intermingled fiber network that yields high breathability due to the high porosity and improved filtration efficiency for use as improved filtration media for respiratory devices and face masks.

Described herein are various three-dimensional fiber structures that have multiple polymer fiber layers with an active therapeutic agent entrained in the polymer fiber layers. Further described are methods for forming the three-dimensional fiber structures where the method includes centrifugal spinning of an emulsion containing polymer(s) and the active therapeutic agent(s).

Described herein are polyphenylene fibers. The polyphenylene fibers have one or more polyphenylene polymers. The polyphenylene fibers can further include one or more poly(aryl ether sulfone) polymers. In some embodiments, the polyphenylene fibers can have an average diameter that is less than about 1 micron. The polyphenylene fibers can have desirable mechanical properties. Also described herein are methods for forming polyphenylene fibers. In some embodiments, the fibers can be fabricated using specifically engineered polymer solutions in conjunctions with adapted force spinning techniques.

Described herein are polyphenylene fibers. The polyphenylene fibers have one or more polyphenylene polymers. The polyphenylene fibers can further include one or more poly(aryl ether sulfone) polymers. In some embodiments, the polyphenylene fibers can have an average diameter that is less than about 1 micron. The polyphenylene fibers can have desirable mechanical properties. Also described herein are methods for forming polyphenylene fibers. In some embodiments, the fibers can be fabricated using specifically engineered polymer solutions in conjunctions with adapted force spinning techniques.

The invention relates to a process for forming nanofibers from a spinning solution utilizing a high speed rotating spin disk having a flat surface. The nanofibers can be collected into a uniform web for selective barrier end uses.