A method for providing a multifilament bundle of melt spun polymer filaments 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 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 pressure-balancing feed-in container arrangement having a container forming a basic body, which container includes a container space in which a piston is arranged in a movable manner, which container space includes a first space portion, i.e. a gas side, and a second space portion, i.e. a material side, which are separated from each other by the piston, a feed pas-sage for feeding material into the material space, and a discharge passage for conducting the material from the material space, and means for connecting a pressure medium source with the gas side of the container, whereby the piston is provided with a piston rod extending towards the gas side and further through a container wall to the exterior of the container, whereby the material feed passage extends through the piston rod and the piston to the material side.

A pressure-balancing feed-in container arrangement having a container forming a basic body, which container includes a container space in which a piston is arranged in a movable manner, which container space includes a first space portion, i.e. a gas side, and a second space portion, i.e. a material side, which are separated from each other by the piston, a feed pas-sage for feeding material into the material space, and a discharge passage for conducting the material from the material space, and means for connecting a pressure medium source with the gas side of the container, whereby the piston is provided with a piston rod extending towards the gas side and further through a container wall to the exterior of the container, whereby the material feed passage extends through the piston rod and the piston to the material side.

Systems for producing M yarns, wherein M1, include N extruders, M spin stations, and a processor, wherein N>1. Each extruder includes a polymer having a color, hue, luster, and/or dyeability characteristic, which are different from each other. Each spin station produces one yarn comprising at least one bundle of filaments. Each spin station comprises at least one spinneret through which filaments are spun from at least two molten polymer streams received by the respective spin station and N spin pumps upstream of the spinneret for the respective spin station. Each spin pump is paired with one of the N extruders. The processor is in electrical communication with the N*M spin pumps and is configured to adjust the volumetric flow rate of the polymers pumped from each spin pump to achieve a ratio of the polymers to be included in each M yarn.

Systems for producing M yarns, wherein M1, include N extruders, M spin stations, and a processor, wherein N>1. Each extruder includes a polymer having a color, hue, luster, and/or dyeability characteristic, which are different from each other. Each spin station produces one yarn comprising at least one bundle of filaments. Each spin station comprises at least one spinneret through which filaments are spun from at least two molten polymer streams received by the respective spin station and N spin pumps upstream of the spinneret for the respective spin station. Each spin pump is paired with one of the N extruders. The processor is in electrical communication with the N*M spin pumps and is configured to adjust the volumetric flow rate of the polymers pumped from each spin pump to achieve a ratio of the polymers to be included in each M yarn.

The present disclosure provides a melt electrospinning device. The melt electrospinning device includes a melting unit, a spinning unit, an electrostatic generating unit, a collection unit, and a sealed cavity. A lining of the melting unit is made of a material having a melting point greater than 500 C. The spinning unit is connected to the bottom of the melting unit and includes a spinneret made from a conductive material having a melting point greater than 500 C. The melt electrospinning process is performed in the sealed cavity. The present disclosure further provides a melt electrospinning method.

Disclosed are methods of forming a plurality of fibers, and nanofibers produced from such a method.

A process for the production of spunbonded nonwoven (1) is shown, wherein a spinning mass (2) is extruded through a plurality of nozzle holes (4) of at least one spinneret (3, 40, 50) to form filaments (5) and the filaments (5) are drawn, in each case, in the extrusion direction, wherein the filaments (5) are deposited on a perforated conveying device (10) to form a spunbonded nonwoven (1) and wherein the nozzle holes (4) of the spinneret (3, 40, 50) are arranged along a main axis (6) oriented in a transverse direction (12) to the conveying direction (11) of the conveying device (10) so that the spunbonded nonwoven (1) formed on the conveying device (10) extends in this transverse direction (12). So as to enable the spinning width and the basis weight distribution of the spunbonded nonwoven to be adjusted reliably and, respectively, to allow the basis weight distribution to be kept constant during operation by means of the process, it is suggested that the spinning mass throughput (31) of the nozzle holes (4) is adjusted variably along the transverse direction (12).

A process for the production of spunbonded nonwoven (1) is shown, wherein a spinning mass (2) is extruded through a plurality of nozzle holes (4) of at least one spinneret (3, 40, 50) to form filaments (5) and the filaments (5) are drawn, in each case, in the extrusion direction, wherein the filaments (5) are deposited on a perforated conveying device (10) to form a spunbonded nonwoven (1) and wherein the nozzle holes (4) of the spinneret (3, 40, 50) are arranged along a main axis (6) oriented in a transverse direction (12) to the conveying direction (11) of the conveying device (10) so that the spunbonded nonwoven (1) formed on the conveying device (10) extends in this transverse direction (12). So as to enable the spinning width and the basis weight distribution of the spunbonded nonwoven to be adjusted reliably and, respectively, to allow the basis weight distribution to be kept constant during operation by means of the process, it is suggested that the spinning mass throughput (31) of the nozzle holes (4) is adjusted variably along the transverse direction (12).

The present disclosure relates to a spinning beam for producing hollow fiber membranes in a phase inversion process, and to a process using the spinning beam.