JPS58192414A - Method of recovering wire of coated wires - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for recovering a covered electric wire by separating the electric wire and its covering material from the covered electric wire and recovering the electric wire.

Scratched coatings made by coating metal wires such as copper or aluminum with thermoplastic resins such as vinyl chloride resin have traditionally been ground into powder or fine particles using a refiner, and then magnetically applied. Magnetic sorting that separates metal powder and resin powder, flotation sorting that uses the difference in specific gravity between metal powder and resin powder to separate them by the difference in sedimentation speed in an aqueous solution, or also by the difference in scattering distance due to wind force. Metals and resins are separated and recovered using various methods such as wind separation. However, in both methods, the covered wire is first pulverized and then separated into metal powder and resin powder by an appropriate method, so the recovery yield is low.
This method has drawbacks such as the need for large-scale equipment for crushing the covered wires, which increases equipment costs and running costs.

The present invention has been made in view of these conventional drawbacks.
The present invention provides a method for separating and recovering an electric wire and its covering material from a covered electric wire efficiently (and at low cost).

Examples of the present invention will be described below.

The lII melting temperature of vinyl chloride resin, which is generally used as an insulating coating material for electric wires, varies depending on the amount of plasticizer added or heat stabilizer, but is usually about 770 to 101 IC.

Therefore, a nonflammable liquid such as lance oil or engine oil is prepared as a liquid having a boiling point temperature higher than its melting temperature. On the other hand, the scrapped covered wire is placed in a mesh container, and the mesh container is immersed in the prepared liquid. Then, this liquid is heated to a temperature slightly higher than the IB melting degree of the resin, so that the resin portion of the covered wire is thermally melted in the liquid. In this case, the liquid may be heated in advance to a temperature slightly higher than the melting temperature of the resin, and the mesh container containing the coated electric wire may be immersed in the liquid, as described above. The specific gravity of petroleum-based liquids in oil is usually about 0.5 to 7.0, while the specific gravity of resin is around 11, although it varies depending on the material. Because of its high specific gravity, the heat-molten resin separates from the wire, passes through the mesh of the mesh container, settles into the container, and is deposited on the bottom. The mesh container is then removed from the liquid and placed in a centrifuge. In this way, the molten resin adhering to the wire is completely blown away from the wire.

On the other hand, since the resin separated from the electric wire has a specific gravity different from that of the liquid, it can also be separated and recovered as a single substance without being fused with the liquid.

Although a liquid with a light specific gravity was selected as the liquid above, even if a liquid metal such as mercury or mud, which has a specific gravity higher than that of the resin, is used, fusion with the resin is prevented and the resin can be recovered alone.

As described above, in the present invention, the molten resin does not dissolve or diffuse in the liquid, but floats on the liquid surface, or settles and accumulates on the bottom, so that it can be easily separated and recovered. Note that the liquid can be used repeatedly.

As explained in the embodiments above, the electric wire recovery method of the present invention involves immersing a covered electric wire coated with a thermoplastic synthetic resin such as vinyl chloride resin in a liquid having a boiling point temperature higher than the melting temperature of the resin. to heat-melt the coating material,
By applying this to a centrifuge, etc., and mechanically wiping it away, the wires and the like can be removed. ""t9;MrrJ)111! t, L4
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can be efficiently recovered, and the resin can be easily recovered without contamination with impurities, making it possible to greatly contribute to resource recycling. Furthermore, it has advantages such as being economical because it does not require large-scale equipment.

Patent Consultant University Kurachi Kidney City

Claims (1)

[Claims] A covered electric wire coated with a thermoplastic synthetic resin such as vinyl chloride resin is immersed in a liquid having a boiling point higher than the melting temperature of the resin. A method for recovering an electric wire of a covered V11 wire, characterized in that the electric wire and its covering material are separated by thermally melting the covering material using i1f, and then mechanically wiping it off using a centrifuge or the like.