Techniques are directed to melt spinning, drawing, crimping and winding multiple threads. The threads are spun from a plurality of spinnerets of a spinning device and are drawn as a thread group by a drawing device and are subsequently fed for crimping next to one another to a plurality of texturing units. In order to obtain identical treatment of all threads within the thread group, the threads are guided individually with a plurality of wraps next to one another on a godet unit and, after running off from the godet unit, are guided in a straight thread run parallel next to one another into the texturing units. To this end, adjacent texturing units of the crimping device form a treatment spacing between themselves which is such that, in the case of being guided individually with a plurality of wraps on the godet unit, the threads can be guided in parallel in a straight thread run.

Techniques are directed to melt spinning, drawing, crimping and winding multiple threads. The threads are spun from a plurality of spinnerets of a spinning device and are drawn as a thread group by a drawing device and are subsequently fed for crimping next to one another to a plurality of texturing units. In order to obtain identical treatment of all threads within the thread group, the threads are guided individually with a plurality of wraps next to one another on a godet unit and, after running off from the godet unit, are guided in a straight thread run parallel next to one another into the texturing units. To this end, adjacent texturing units of the crimping device form a treatment spacing between themselves which is such that, in the case of being guided individually with a plurality of wraps on the godet unit, the threads can be guided in parallel in a straight thread run.

An apparatus for continuous needleless electrospinning of a nanoscale or submicron scale polymer fiber web onto a substrate includes an electrospinning enclosure that includes at least one liquid polymer coating device and an electro spinning zone and a wire drive system located external to the electro spinning enclosure. The wire drive system drives a plurality of continuous electrode wires through the electrospinning enclosure. A liquid polymer recycle and feed system is located external to the electrospinning enclosure and includes a recycle and feed tank that supplies liquid polymer to and receives overflow liquid polymer from the at least one liquid polymer coating device. A vapor collection and solvent recovery system includes at least one exhaust stream, collects and processes vapors generated in the electrospinning enclosure, and maintains a pressure in the electrospinning enclosure that is lower than atmospheric pressure.

An apparatus for continuous needleless electrospinning of a nanoscale or submicron scale polymer fiber web onto a substrate includes an electrospinning enclosure that includes at least one liquid polymer coating device and an electro spinning zone and a wire drive system located external to the electro spinning enclosure. The wire drive system drives a plurality of continuous electrode wires through the electrospinning enclosure. A liquid polymer recycle and feed system is located external to the electrospinning enclosure and includes a recycle and feed tank that supplies liquid polymer to and receives overflow liquid polymer from the at least one liquid polymer coating device. A vapor collection and solvent recovery system includes at least one exhaust stream, collects and processes vapors generated in the electrospinning enclosure, and maintains a pressure in the electrospinning enclosure that is lower than atmospheric pressure.

An electrospinning device is provided with a container for holding a liquid comprising a polymer melt or a polymer solution, and a nozzle arranged to outlet a stream of the liquid from the container. A collector collects electro spun material during electrospinning so as to form a fibrous structure. The device comprises an optical measurement system that measures a baseline distance between the collector and the optical measurement system for at least one location on a surface of the collector, and also measures a momentary distance between the optical measurement system and a momentary top layer of the fibrous structure during the electrospinning process. A processor calculates a momentary thickness of the fibrous structure. Once a required thickness is reached the electrospinning can be stopped.

An electrospinning device is provided with a container for holding a liquid comprising a polymer melt or a polymer solution, and a nozzle arranged to outlet a stream of the liquid from the container. A collector collects electro spun material during electrospinning so as to form a fibrous structure. The device comprises an optical measurement system that measures a baseline distance between the collector and the optical measurement system for at least one location on a surface of the collector, and also measures a momentary distance between the optical measurement system and a momentary top layer of the fibrous structure during the electrospinning process. A processor calculates a momentary thickness of the fibrous structure. Once a required thickness is reached the electrospinning can be stopped.

A plant for making melt-blown type non-woven fabric including a distributor including at least one main access for placing in fluid passage connection with a main conduit of a case for conveying polymeric fluid and a plurality of secondary accesses for placing in fluid passage connection each with a respective secondary conduit of the case for conveying gas; a dispenser in fluid passage connection with the distributor, for dispersing polymeric filaments from the polymeric fluid and including at least one spinneret for forming the polymeric filaments and an air blade for receiving gas to guide the polymeric filaments exiting the dispenser. The spinneret comprises includes a plurality of pinnacles flanked and each including a main outlet for conveying polymeric fluid. towards a respective delivery direction. The air blade is to convey gas jets to converge towards each delivery direction.

A plant for making melt-blown type non-woven fabric including a distributor including at least one main access for placing in fluid passage connection with a main conduit of a case for conveying polymeric fluid and a plurality of secondary accesses for placing in fluid passage connection each with a respective secondary conduit of the case for conveying gas; a dispenser in fluid passage connection with the distributor, for dispersing polymeric filaments from the polymeric fluid and including at least one spinneret for forming the polymeric filaments and an air blade for receiving gas to guide the polymeric filaments exiting the dispenser. The spinneret comprises includes a plurality of pinnacles flanked and each including a main outlet for conveying polymeric fluid. towards a respective delivery direction. The air blade is to convey gas jets to converge towards each delivery direction.

An apparatus for continuous needleless electrospinning of a nanoscale or submicron scale polymer fiber web onto a substrate includes an electrospinning enclosure that includes at least one liquid polymer coating device and an electro spinning zone and a wire drive system located external to the electro spinning enclosure. The wire drive system drives a plurality of continuous electrode wires through the electrospinning enclosure. A liquid polymer recycle and feed system is located external to the electrospinning enclosure and includes a recycle and feed tank that supplies liquid polymer to and receives overflow liquid polymer from the at least one liquid polymer coating device. A vapor collection and solvent recovery system includes at least one exhaust stream, collects and processes vapors generated in the electrospinning enclosure, and maintains a pressure in the electrospinning enclosure that is lower than atmospheric pressure.

An apparatus for continuous needleless electrospinning of a nanoscale or submicron scale polymer fiber web onto a substrate includes an electrospinning enclosure that includes at least one liquid polymer coating device and an electro spinning zone and a wire drive system located external to the electro spinning enclosure. The wire drive system drives a plurality of continuous electrode wires through the electrospinning enclosure. A liquid polymer recycle and feed system is located external to the electrospinning enclosure and includes a recycle and feed tank that supplies liquid polymer to and receives overflow liquid polymer from the at least one liquid polymer coating device. A vapor collection and solvent recovery system includes at least one exhaust stream, collects and processes vapors generated in the electrospinning enclosure, and maintains a pressure in the electrospinning enclosure that is lower than atmospheric pressure.