DE1540383B2 - DEVICE FOR INSULATING THIN ELECTRIC CONDUCTORS, IN PARTICULAR EXTREMELY THIN COPPER CONDUCTORS WITH POLYAETHYLENE OR POLYPROPYLENE - Google Patents

Description

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The invention is concerned with the insulation of thin ovens in which the dispersant escapes electrical conductor, especially extremely thin rend the polyethylene-copper conductor remaining on the conductor, as it sinters as a message or polypropylene powder and becomes homocable used in local area networks, fused with gene coating. According to the invention Polyethylene or polypropylene. 5 is the application roll in a perpendicular to the

In itself, it is common to isolate the electrical running direction of the conductor in the lying direction.

Head with polyethylene stored the conductor to be insulated bar.

with the help of an extruder with polyethylene so the application roller can be adjusted horizontally,

splash. This procedure leads to difficulties. Depending on the intended setting, the loan is running the diameter of the conductor to be insulated io ter between the two inner walls of the on

and so that the insulation wall thickness runs through a certain idler without rope the inner walls; ^

Value falls below. For example, it is with the touch, closer to the hub or more

usual extruders only with great difficulty in the vicinity of the periphery of the applicator roll. By

possible to use insulation wall thicknesses below 0.2 mm - this setting of the distance between the conductor and the place. 15 hub of the roller, the centricity of the insulation

It is known to affect the insulation of extremely thin copper. Depending on the diameter

ferleiter polyethylene solutions to use (German ser of the conductor and the wall thickness of the Iso

Interpretation document 1 088 566). For this purpose, polyethylene lation can thus be an optimal setting

for example dissolved in toluene. To solve the find the exact centricity of the on the ladder However, polyethylene must ensure high temperatures of 20 applied insulation

at least 95 ° C must be used. The speed of the application roller affects the

For the insulation of wires with polytetrafluor- Reduction of the viscosity of the thixotropic dispersion

Ethylene is also known, aqueous colloidal sion within certain limits, so that this increases the strength

To use dispersions in which a wetting agent is applied to the insulation applied to the conductor is added (U.S. Patent 2,478,229). Also 35 desired dimension can be set. It is recommended

It is known to use aqueous polyethylene dispersions, therefore, do not use the applicator roller

Coating and impregnating objects to drive through conductors themselves, but rather

(U.S. Patent 2,290,794). Such the application roll, for example, by an electrical

thin dispersions only adhere to the engine, external drive,

extremely low strength on metal conductors. 3 ° Furthermore, it is advisable to use the application roller

Furthermore, it is known to give such a surface roughness for coating that the in Objects, especially those with a sharp dispersion contained solids Corners or edges, or to be used for filling. The surface roughness of the exposed structures, such as an electric roller, then results in the formation of a liquid streak Coils, instead of the otherwise customary lacquer 35 films, which would result in slippage between the hardenable, solvent-free coating masses or support roller and the dispersion. To use filling compounds that are thixotropic (German: The new device is particularly suitable for see patent specification 855 440). In this thixotropic application of a polyethylene insulation from a It is known that mass is thixotropic by mechanical water-alcoholic polyethylene dispersion like shaking, stirring, vibrating etc., a 4 ° per structure. Here, both high-pressure poly-liquefaction the otherwise gel-like mass. ethylene and low-pressure polyethylene in fine-von these are used for a thixotropic body in powder form per se; a maximum part indicative Property is moreover also a surface size of about 50 μ should not be exceeded in the well-known thixo used in the household. With regard to those in the oven zones use has been made of tropical paints, where thermal degradation occurs, it is advisable to Liquefaction at the moment of application to the polyethylene powder with about 0.5 to 3% per se Stabilize the body to be covered by the pressure of the known stabilizers. To prakhierzu brush used. a water-based implementation is recommended

The invention is based on the object of providing an alcoholic dispersion with a solids content

Device for insulating thin electrical conductors, 5 ° from 25 to 45% polyethylene.

especially extremely thin copper conductors, with poly- in a known manner, it is recommended

To create ethylene or polypropylene, which, among other things, the dispersant wetting agent in a

Use of an aqueous-alcoholic dispersion amount of 0.2 to 5%, calculated on the solids

thixotropic structure to add the desired geometric permittivity of the dispersion, which the

Insulation properties guaranteed. 55 Surface and interfacial tension between

For this purpose, the invention is based on a device to reduce the dispersion medium and the powdery device for insulating thin electrical conductors with polyethylene or polypropylene or the polyethylene or polypropylene to be insulated by immersing the resulting electrical conductor. Non-ionic wetting agents can be used as network conductors in an aqueous-alcoholic dispersion of thixotropic agents. with this device, the conductor runs poorly. At the point of exit from the thixotropic dispersion, wetting agents with a polyglycol chain of 5 to 15 molecules of ethylene oxide in the vertical direction between the inner walls, which are incised with Pheeiner on the circumference and have a viscosity of 65 noles, have proven to be particularly advantageous; these phenols are substituted with aliphatic thixotropic dispersion-reducing, umlau- tic side chains of C ₉ to C ₁₃ . Instead of the application roller running through and then running through substituted phenols, the polyglycol chain can then vertically include one or more heated ones, including those with saturated and unsaturated fatty alcohols

be etherified to C _eighteenth Furthermore, as h

g ₁₈

Wetting agents have also proven suitable for fatty acid polyglycol esters whose fatty acid component consists of saturated and unsaturated C ₈ to C ₁₈ carboxylic acids.

But it is also possible in a manner known per se, ionogenic wetting agents, for example ammonium compounds, that are thermally degraded to non-ionic products during the sintering and melting process in the furnace zones will. The ammonium salts of fatty or resin acids are particularly suitable for this.

It is also advisable to add about 1 to 20% of the thixotropic polyethylene or polypropylene dispersion higher aliphatic branched and unbranched alcohols and known thickeners such as Hydrate cellulose, methyl cellulose or soy lecithin.

In the F i g. 1 and 2 is an embodiment of a device designed according to the invention for insulating thin copper wires, which is described below.

The copper wire 2 running from the supply roll 1, which has a diameter of 0.3 mm, first passes through the cleaning bath 3 and then the soft annealing device 4 with an internal temperature of about 500 ° C. and reducing) between. inert atmosphere. The copper wire, cleaned and softened in this way, then runs over the roll 5 into the application vessel 6 which is filled with the hixotropic polyethylene dispersion 7. This ^D olyäthylendispersion 7 consists of 40% of a stabilized high pressure polyethylene powder with a melting index of 2 and an average particle size of 20 μ, the maximum particle size does not exceed 10 μ, from 36.5% water, from 15% ethyl alcohol, from 1% Nonylphenol polyglycol ether, ius 2.5% hydrate cellulose and 5% isopropyl alcohol.

With the help of the deflection roller 8, the wire is deflected vertically upwards and runs between the inner walls of the application roller 18 'cut on the circumference without touching the inner walls of this roller. Then the) raht 2 passes through the vertical) fen 11 without further deflection, which is divided into the three heating zones a, b, c, with different temperatures. In the heating zone α , the dispersion medium first evaporates, so that the wire 2 has a uniform, central application of dry ethylene powder when it enters the heating zone b. In the heating zone b, the polyethylene powder sinters together and melts: finally in the heating zone c to form a smooth polyethylene coating.

The wire 2 exiting after the exit from the vertical furnace 11, which passes through the deflection rollers 12 is deflected again, is withdrawn by the take-off device 13 and on the storage drum 4 wound up.

The application roller 18 'is horizontally adjustable so that the wire 2 depending on the setting : or more near the hub or more near; the periphery of the application roller that through the inner walls gap formed by this role happens. Depending on the diameter of the wire 2 and of the thickness of the insulating coating to be applied allows an optimal setting of the horizontally displaceable Find application roll 18 ', which for the given circumstances an exact centricity of the insulation guaranteed.

This adjustment of the centricity of the insulation applied to the conductor by moving the Application roller perpendicular to the direction of travel of the conductor, d. H. by adjusting the distance between the hub of the applicator roll 18 'and the conductor 2 is particularly effective when the applicator roll 18 'runs counter to the direction of passage of the conductor. For this purpose the application roll 18 'is driven externally by the electric motor 23. By influencing this motor, the Regulate the speed at which the application roller 18 'rotates. By changing this speed changes the viscosity of the dispersion at the exit point of the conductor, so that the wall thickness of the applied coating can be adjusted exactly to the desired level.

The application roller, and in particular the inner walls of the roller, are made of a pressed material manufactured. By using such a material, there is sufficient surface roughness the application roller 18 'ensures that the formation of a liquid film and thus the occurrence a slip between the roller and the dispersion is prevented.

Claims (4)

Patent claims: 1. Device for insulating thin electrical conductors, especially extremely thin copper conductors, with polyethylene or polypropylene by immersing the conductor in an aqueous-alcoholic one Dispersion of thixotropic structure containing the polyethylene or polypropylene in fine powder Contains state as a solid phase in which the conductor is at the point of exit from the thixotropic dispersion in the vertical direction between the inner walls of an incised on the circumference, the Viscosity of the thixotropic dispersion reducing, rotating applicator roller and then vertically passes through one or more heated ovens in which the dispersant escapes while the polyethylene or polypropylene powder remaining on the conductor sinters and fused to form a homogeneous coating, characterized in that the application roller (18 ') in a perpendicular to Direction of passage of the conductor lying direction is adjustable. 2. Apparatus according to claim 1, characterized in that the application roller, for example is driven externally by an electric motor. 3. Apparatus according to claim 1, characterized in that the application roller rotates in opposite directions to the direction of passage of the conductor. 4. Apparatus according to claim 1, characterized in that the surface of the applicator roller is rough. 1 sheet of drawings