Linear Fibrous Formation with a Coating of Polymeric Nanofibers Enveloping a Supporting Linear Formation Constituting a Core, a Method and a Device for Producing It

A linear fibrous formation, comprising:

• a supporting linear formation defining a core;
• a coating of polymeric nanofibers enveloping the supporting linear formation;
• and
• wherein the coating of polymeric nanofibers comprises a flat stripe wound around the core into a helical form, the flat stripe created from a hollow electrically neutral nanofibrous plume generated above a spinning electrode during spinning by AC electric voltage.

A method for production of a linear fibrous formation, comprising:

• conveying a supporting linear formation in the form of a core through a spinning chamber wherein the core is enveloped with a coating of polymeric nanofibers, the spinning chamber having a spinning electrode powered by AC voltage;
• in the spinning chamber, forming a hollow electrically neutral plume of nanofibers in a spinning space above the spinning electrode from a polymeric material fed to the spinning chamber, the plume changing into a flat stripe having an organized structure of the nanofibers;
• guiding the flat stripe onto a circumference of the core while rotating the core around its axis or while ballooning the core in the spinning space;
• and
• wherein the stripe is wound around the core in a manner to form a helix winding around the core.

A system for production of a linear fibrous formation, comprising:

• a spinning chamber;
• a feeding device disposed so as to feed a supporting linear formation to the spinning chamber;
• a spinning electrode arranged in the spinning chamber and connected to a source of AC electric voltage, wherein a plume of polymeric nanofibers is formed in a sinning space above the spinning electrode in the spinning chamber;
• a draw-off device disposed to withdraw the linear fibrous formation from the spinning chamber;
• a twisting device disposed in a path of the supporting linear formation, the twisting device configured to create a false twist in or a rotating balloon from the supporting linear formation in the spinning chamber;
• and
• wherein, as a result of the false twist or ballooning of the supporting linear formation moving through the spinning chamber, the plume of polymeric nanofibers is wound around the supporting linear formation in a form a flat stripe having an organized structure the nanofibers.