CZ25054U1 - Means for applying polymer solution to spinning electrode - Google Patents

Description

Application of a polymer solution to the string spinning electrode

Technical field

The present invention relates to the application of a polymer solution to the string spinning electrode of a device for producing nanofibres by electrostatically spinning a polymer solution in a high intensity electrostatic field comprising a string electrode channel which passes through the polymer solution channel.

BACKGROUND OF THE INVENTION

In current devices for production of nanofibres by electrostatic spinning of polymers in electrostatic field with high intensity, spinning electrodes are used consisting of a string stretched between conductors placed on the machine frame in the spinning chamber. The polymer solution is applied to the string by a applicator comprising a coating agent for each string, in which a supply chamber filled for application by the polymer solution is formed and connected to the outside by two application holes through which the string passes and the gap between the string and the application hole. the polymer solution is leaking.

The problem is the precise positioning of the application apertures with respect to the brief and long-term maintenance of the set position. In the case of application holes bias towards either ^one string occurs breakage of the cord, the cut or the coating agent in the openings, and thus to degradation of the entire coating composition.

The aim of the technical solution is to reduce the accuracy of the positioning of the application agent with respect to the string while maintaining a high-quality application of the polymer to the string and to achieve the maximum service life of the application agent and the string.

The essence of the technical solution

The object is achieved by a coating means, characterized in that at least two perpendicular pairs of guide elements are arranged in the string electrode channel, the gap between the guide elements of the respective pair being smaller than the smallest dimension of the string electrode channel. Although the cross-section of the string electrode channel is reduced at the location of the guiding elements, the string is guided more precisely and, since the guiding elements are of abrasion-resistant material, they are not pruned and not pruned through the string electrode channel.

In a simpler embodiment, one pair of perpendicular guide elements is mounted in a holder housed in the coating agent body, wherein the gap between the guide elements of the respective pair lies in the polymer solution channel at the point of passage of the string electrode channel.

Another embodiment comprises two perpendicular pairs of guide elements positioned at both ends of the coating agent and extending into the string electrode channel. This embodiment provides more accurate guidance and the greatest possible deviation of the position of the string electrode.

Clarification of drawings

An exemplary embodiment is schematically shown in the drawing, wherein FIG. 1 shows a deposition means with a central guide for the string electrode and FIG. 2 depicts a deposition means with the edge guides for the string electrode.

Examples of technical solutions

The coating agent is shown very schematically in the drawings, only the parts necessary for the explanation of the technical solution being shown and also only schematically. The coating agent is part of the coating device.

- 1 CZ 25054 Ul

A channel 4 is formed in the coating composition body, which is filled with a polymer solution during application, and a perpendicular channel 3 for passing a string electrode (not shown) passing therethrough through the polymer solution channel 4 therethrough.

In the embodiment of FIG. 1, a holder 6 is disposed in the coating composition body and extends into the polymer solution channel 4. The holder 6 accommodates a pair of first guide elements I and a perpendicular pair of second guide elements 2. Both pairs of guide elements 1, 2 are positioned such that the gap between the guide elements I or 2 of the respective pair lies in the polymer solution channel 4 at the passage point. and the distance therebetween is less than the diameter of the string electrode 3. The guide elements are made of abrasion-resistant material, preferably ceramic, and in the illustrated embodiment have the shape of cylindrical rods, which can be changed to another shape suitable for guiding the string electrode. The curves 5 in FIG. 1 show the area through which the string electrode can pass.

The string electrode channel 3 may have a cross section other than a cylindrical cross section, for example square or rectangular. In this case, the gap between the guide elements 1 or 2 of the respective pair 15 is smaller than the smallest dimension of the string electrode channel 3.

The positioning of the guide elements 2 in the polymer solution duct 4 deteriorates the flow properties of the duct 4, and therefore the embodiment shown in FIG. 2 has been created in which two perpendicular pairs of guide elements 1, 2 are positioned at both ends channel 3 for the string electrode. In this embodiment, the larger possible deviation of the semi-electron string electrode shown in FIG. 2 is by the curves 5.

Claims (4)

An apparatus for the production of nanofibres by electrostatic spinning of a solution of a polymer in a high-intensity electrostatic field comprising a string electrode channel (3) passing through a channel (4) spun to a polymer, characterized in that in the channel (3) at least two perpendicular pairs of guide elements (1, 2) are arranged for the string electrode, the gap between the guide elements (1) or (2) of the respective pair being smaller than the smallest dimension of the string electrode channel (3). Coating agent according to claim 1, characterized in that one pair per The 30 perpendicular guide elements (1, 2) are housed in a holder (6) housed in the coating body, the gap between the guide elements (1) or (2) of the respective pair lying in the polymer solution channel (4) at the channel passage ( 3) for string electrode. Coating means according to claim 1, characterized in that two perpendicular pairs of guide elements (1, 2) are located at both ends of the coating means and engage it in the string electrode channel (3). Coating means according to any one of claims 1 to 3, characterized in that the guide elements (1, 2) are made of abrasion-resistant material.