Spinning fibre-forming electrode

FIELD: process engineering.

SUBSTANCE: invention relates to production of nanofibres by electrostatic process. Spinning fibre-forming electrode designed to carry polymer solution or melt in electric field for fibre forming in devices intended for fibre forming by electrostatic process from said solutions or melts. Said electrode features elongated shape and comprises two end parts arranged at carrier. Fibre-forming elements made of string or wire bar are laid between said two parts. In compliance with this invention said fibre forming electrodes are inclined to axis of spinning of said electrode.

EFFECT: no sputter of polymer solution or melt.

8 cl, 4 dwg

 

Area of technology

The invention relates to a rotating fiber electrode oblong serving to make the solution or melt of the polymer matrix from the reservoir to the electric field for forming fibers in devices for the production of nanofibers by electrostatic method of forming fibers from solutions or melts of polymeric matrix containing a pair of end parts arranged on a carrier means, between which laid fiber-forming strings or wire rods.

The level of technology

The known device for production of nanofibres from the polymeric solution by electrostatic method of forming fibers, comprising rotary located fiber-forming electrode of elongated shape, as shown, for example, in WO 2005/024101 A1. The device comprises a fiber-forming electrode in the form of a cylinder which rotates around its main axis and the bottom surface is wetted by immersion in a polymer solution. The polymer solution is carried on the surface of the cylinder in an electric field between the fiber-forming and precipitation electrodes, where the formation of nanofibers, which moved in the direction to the receiving electrode and before it is placed on the lining material. This device could very well form nanovel�kPa from aqueous solutions of polymers, but the layer of nanofibers deposited on the lining material is uneven throughout its length.

From DE 10136255 B4 discloses a device for producing fibers from a solution or melt of a polymer containing at least two fiber-forming electrode device, each of which consists of a system of parallel wire rods arranged on a pair of endless belts, encircling two guide cylinders, which are arranged one above the other, wherein a lower guide cylinder partially immersed in the solution or the polymer melt. Between the above two fiber-forming electrode devices is sent to a textile material, serving as an opposite electrode, wherein fiber-forming electrode device simultaneously applied to the layer of fibers on the face and reverse side of the textile material.

Fiber-forming electrode connected to the high voltage source together with the opposite electrode, which is a conductive moving belt. The solution or the polymer melt is made with wire rods in an electric field between the fiber and the opposite electrode, where from the solution or melt of the polymer molded fiber, which moved to the opposite electrode and stacked on �excelleny material, arranged on the opposite electrode. The disadvantage of this solution is the long residence times of the solution or melt of the polymer in an electric field, and consequently, the solution and the polymer melt relatively quickly grow old and, therefore, their properties in the process of forming fibers change that results in changes of parameters preformed fibers and, in particular, of their diameter. The next disadvantage is the arrangement of the wire rods of the fiber-forming electrode on a pair of endless belts, or which are conductive and have a very negative effect on an electric field generated between the fiber and the opposite electrode, or do not possess electrical conductivity, and a high voltage is applied to the wire rods of the fiber-forming electrodes with the aid of sliding contacts, mainly on one to three bar, unnecessarily complicates the device for forming fiber.

From WO 2008/028428 known rotary fiber-forming electrode of elongated shape, applied in the device for production of nanofibers by electrostatic method of forming fibers from polymer solutions containing a pair of end parts between which are fiber-forming wire elements equally spaced along the circumference � parallel to the axis of rotation of the rotating fiber-forming electrode. Mechanical parts are made of non-conductive material, and all the fiber-forming conductive elements are connected.

Fiber-forming elements arranged parallel to the axis of rotation of the rotating fiber-forming electrode, although provide good conditions for molding fiber in an electric field, but when they are stepping out of the solution or melt of the polymer, due to surface tension of the solution or melt of the polymer, especially when the length of the electrodes is greater than 0.5 m, the spraying of the solution or melt of the polymer, since the fiber-forming element along the length is above the level at one point.

The aim of the invention is the preservation of good conditions for forming fibers and elimination of spatter in the output of the fiber-forming element from a solution or melt of the polymer.

Summary of the invention

The purpose of the invention is achieved by a rotary fiber-forming electrode according to the invention, the essence of which is that fiber-forming strings or wire rods are at an angle to the axis of rotation of the rotating fiber-forming electrode. As a consequence of the angle of the axes of fibre string or wire rod comes out of the solution or melt of the polymer matrix gradually and therefore prevent�asaeda spatter even when the lengths of the fiber-forming electrode over 1 m.

To achieve optimal conditions for forming fibers advantageously, when the ends of fibre string or wire rods on both end parts are located at the same distance from the axis of rotation.

To provide an easy supply of electric voltage on fiber-forming strings or wire rods advantageously, if the mechanical parts are made of a conductive material. This solution is enough, when electric voltage is applied in a solution or melt of the polymer matrix, and because of the electrical conductivity of the end parts, the part which resides in the solution or melt of the polymer matrix, all fiber-forming strings or wire rods are under tension.

This is especially important when the length of the rotating fiber-forming electrode is more than 1 m it is important that all fiber-forming strings or wire rods have been carefully strained. This is achieved by a tensioning means.

Fiber-forming strings or wire rods spinning fiber-forming electrode may be formed as one continuous string, or as one continuous Provolone rod, and at least one end part is movable in the direction of the axis of rotation of the rotating fiber-forming electrode and connected to �etajnim agent.

The tensioning means comprises a stop attached between the end parts and a compression spring located between the stop end and move the item.

The emphasis in the preemptive execution has the shape and dimensions of the mechanical parts and provided with openings for the passage of fibre string or wire rods movable mechanical parts on which they are fixed.

Fiber-forming strings or wire rods on the end parts can be located separately, and each fiber-forming the wire or each wire rod corresponds to at least one individual tensioning means.

The individual tensioning means mainly consists of a compression spring located between the end part and an end element mounted on the end of voloknoobrazujushchih string or wire rod.

Brief description of the drawings

Spinning fiber-forming electrode according to the invention is shown schematically in the accompanying drawing, where Fig.1 - axonometric view of a rotary fiber-forming electrode; Fig. 2, version with tensioning elements consisting of a single string or a single wire rod with a tensioning tool; Fig. 3, version with separate tension elements and the Central stretch of SR�the rotary; Fig. 4, version with separate tension elements and individual tensioning means.

Detailed description of the invention

Spinning fiber-forming electrode comprises a support means 1, which shows the performance consists of a shaft, which is perpendicular to its longitudinal axis 11, which serves as an axis of rotation of the rotating fiber-forming electrode are arranged end parts 2, 3. The support means 1 may be made of, for example, as a tube or other appropriate body. In the example of execution shown in Fig.1, both end parts have the same diameter, and their circles evenly made grooves 21, 22, 23, 24, 25, 26; 31., 32, 33, 34, 35 and 36 in which is located a wire rod or wire 4, wherein portions of the string or wire rod 4, stretched between the end parts 2, 3 form a fiber-forming elements 41, 42, 43, 44, 45, 46. End part 3 is rotated relative to the end parts 2, therefore, the axis of the fiber elements 41, 42, 43, 44, 45, 46 disposed at an angle to the axis 11 of rotation of the fiber-forming electrode. The ends

fiber elements 41, 42, 43, 44, 45, 46 on both end parts 2, 3 are located at the same distance from the axis of rotation. End parts 2, 3 is made of a conductive material. In the examples of execution shown in Fig.1 and 2, in�osnabrugge elements 41, 42, 43, 44, 45, 46 are formed as one continuous string, or one continuous wire rod 4. In the performance of Fig.1 string or wire rod 4 is fixed in a stationary end parts 2, 3.

As shown in Fig.2, one end detail 2 are fixed, and the second end part 3 is located on the host vehicle 1 with the possibility of axial movement. Between the end parts 2, 3 on the host vehicle 1 is fixedly installed emphasis 5, between which and the movable end part 3 is a compression spring 6. In the example of execution, the focus has the shape and dimensions of the mechanical parts and is provided with holes or slots for the passage of the string or wire rod 4, which is fiber-forming elements 41, 42, 43, 44, 45, 46.

In the examples of execution shown in Fig.3 and 4, the fiber-forming elements 41, 42, 43, 44, 45, 46 created as a separate string or wire rods 4. In the performance of Fig.3 as performed in Fig.2, one end of the workpiece 2 mounted in a fixed position, and the second end part 3 is installed on the host vehicle 1 with the possibility of axial movement. Between the end parts 2, 3 on the host vehicle 1 is fixedly installed emphasis 5, between which and the movable end part 3 is a compression spring 6. In the example of execution, the focus has the shape and dimensions of the mechanical parts and SN�been holes or slots for the passage of the strings or wire rods 4, which fiber-forming elements 41, 42, 43, 44, 45, 46. In the unaired version, the diameter of the stop 5 is less than the diameter of the end parts 3. In this version, all the tension of the individual fiber elements 41, 42, 43, 44, 45, 46 is one movable mechanical part 3 and the compression spring 6, which requires adherence to equal the length of the individual fiber elements 41, 42, 43, 44, 45, 46.

This problem is eliminated at the expense of execution, shown in Fig.4, where each fiber-forming element 41, 42, 43, 44, 45, 46 corresponds to individual tensioning means comprising a compression spring 6 and the end member 7 fixed to the end of the fiber-forming element 41, 42, 43, 44, 45, 46.

If necessary change the length of the rotating fiber-forming electrode can be a simple way to move the end parts 2, 3 on the host vehicle 1. For example, can be performed in the host vehicle 1 fixing holes with constant steps. Therefore, in this case, the user has the ability to change the distance between the end parts depending on the width of material being processed.

1. Spinning fiber-forming electrode, an employee for making a polymer solution from the reservoir of polymer solution or melt in an electric field for forming fibers in devices Dneprospetsstal of nanofibers by electrostatic method of forming fibers from polymer solutions or melts, and having an elongated shape, containing a pair of end parts (2, 3), which are arranged on a carrier vehicle (1) and between which laid fiber-forming elements(41, 42, 43, 44, 45, 46), made of string or wire rod (4), characterized in that the fiber-forming elements(41, 42, 43, 44, 45, 46) are inclined to the axis (11) of rotation of the rotating fiber-forming electrode.

2. Spinning fiber-forming electrode according to claim 1, characterized in that the ends of the fiber elements(41, 42, 43, 44, 45, 46) on both end parts (2, 3) are located at the same distance from the axis (11) of rotation.

3. Spinning fiber-forming electrode according to claim 2, characterized in that the end parts (2, 3) made of a conductive material.

4. Spinning fiber-forming electrode according to any one of claims.1-3, characterized in that the fiber-forming elements(41, 42, 43, 44, 45, 46) consist of one continuous string, or one continuous wire rod (4), wherein at least one end part (3) mounted for displacement in the direction of the axis (11) of rotation of the rotating fiber-forming electrode and connected to the tensioning means.

5. Spinning fiber-forming electrode according to claim 4, characterized in that the tensioning means consists of a cap (5) mounted between the end parts (2, 3) and compression spring (6) located between UE�rum (5) and movable end part (3).

6. Spinning fiber-forming electrode according to claim 5, characterized in that the stop (5) has the shape and dimensions of the end parts (2, 3) and provided with openings for the passage of fibre elements(41, 42, 43, 44, 45, 46) movable end part (3), which is fixed to the fiber-forming elements(41, 42, 43, 44, 45, 46).

7. Spinning fiber-forming electrode according to any one of claims.1-3, characterized in that the fiber-forming elements(41, 42, 43, 44, 45, 46) installed on the end parts (2, 3) separately, and each of them corresponds to at least one individual tensioning means.

8. Spinning fiber-forming electrode according to claim 7, characterized in that the individual tensioning means comprises a compression spring (6) located between the respective end part (3) and an end element (7) fixed to the end of the fiber-forming element(41, 42, 43, 44, 45, 46).



 

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