Method and Device for Production of Nanofibres From the Polymeric Solution Through Electrostatic Spinning

Abstract

Production method of nanofibres from the polymeric solution through electrostatic spinning in electric field created by a difference of potentials between the collecting electrode (4) and pivoted spinning electrode (1) of an oblong shape touching by a part of its circuit the polymeric solution (3), while by rotation of the spinning electrode (1) the polymeric solution (3), at least by a portion of its surface, is carried out into the electric field in which on the surface of the collecting electrode (4) the nanofibres are created which are carried to the collecting electrode (4) and deposited on the surface of a basic material (5) guided between the spinning electrode (1) and the collecting electrode (4) in vicinity of the collecting electrode (4). The polymeric solution (3), on surface of the spinning electrode (1) in a place of intersection of surface of the spinning electrode (1) with the plane interlaid by the axis of the spinning electrode (1) and being perpendicular to the plane of the base material (5), along the whole length of the spinning electrode (1), is subject to the electric field of a maximum and equal intensity, through which a high and even spinning effect is achieved along the whole length of the spinning electrode (1). The invention also relates to the device for production of nanofibres from polymeric solution through electrostatic spinning.

Description

TECHNICAL FIELD[0001]The invention relates to the production method of nanofibres from the polymeric solution through electrostatic spinning in electric field created by a difference of potentials between the collecting electrode and pivoted spinning electrode of an oblong shape touching by a part of its circuit the polymeric solution, while by rotation of the spinning electrode the polymeric solution, at least by a portion of its surface, is carried out into the electric field in which on the surface of the collecting electrode the nanofibres are created which are carried to the collecting electrode and deposited on the surface of a basic material guided between the spinning electrode and collecting electrode in vicinity of the collecting electrode.[0002]The invention also relates to the device for production of nanofibres from polymeric solution through electrostatic spinning in electric field created by a difference of potentials between the collecting electrode and the pivoted s...

AI Technical Summary

Problems solved by technology

The greatest problem of this method is a low output.

On one spinning jet, 0.1 to 1 gram of polymer in one hour may be, which, from the point of view of industrial usage, creates the production of nanofibres according to these solutions rather problematic.

Unfortunately the number of jets cannot be increased in an unlimited way, as well as there are limits as to the distance of jets among each other, which is given by the electric field itself, so also this solution does not bring a decisive point as regards an output.

The device can only hardly be used in industry as it is complicated, non-productive and the possible layer of fibres, eventually the non-woven textile produced by electrostatic spinning would be of a very irregular thickness and structure.

The disadvantage of this solution is a small efficiency, because into the electrostatic field only a small quantity of polymer solution being subject to spinning penetrates and only a small portion is changed over into the fabrics.

Another disadvantage is irregular thickness of nanofibre layers along the width.

The solution is very complicated due to the rotational drive of askew positioned discs and increasing of evenness of applied layer of nanofibres is possible only in the direction of movement of the base material and it cannot be presumed even in the direction of the width of the base material.

The disadvantage of this solution is that the spinning takes place on the peaks of protrusions where concentration of the charge is the greatest while the collecting cavities are arranged on the smaller diameter than the peaks of protrusions, so it is complicated to transport the measured off quantity of a polymeric solution to the respective peak.

It does not solve the spinning issue for solutions on a non-water basis.

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