JPS6048964B2 - How to separate metal and plastic from metal laminate plastic sheath - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention produces aluminum (Al) and polyethylene (abbreviated as PE) from aluminum laminate polyethylene source.
It concerns a method of separating .

When a product made by laminating a PE sheath on a tape or thin plate is collected after use, it is desirable to separate Al and PE to recycle resources.

Note that such products are used, for example, as sheaths for electric wires and cables. Conventionally, the following methods have been used for this separation.

(a) Heat separation method: Heat is applied to soften the adhesive and separate it.

゜(口) Crushing and separation method...Finely crushed and then physically and chemically separated.

←→ Freeze separation method: Separation takes advantage of PE's low-temperature brittleness.

(-AA1 dissolution method...Dissolves Al using a special solvent and recovers PE.

All of these methods have advantages and disadvantages, such as complete separation being difficult, high cost, potential for pollution problems, and troublesome processing of short objects, and few have been put into practical use. .

Specifically, method (a) is suitable for long objects, but is too time-consuming for short or deformed objects.

In method (b), fine powder of N is generated and it is difficult to completely separate it, and sometimes PE and A1 are fused together due to the heat during crushing and cannot be separated.

The method ←→ completely separates PE and N, but the cost is high.

The method (d) is troublesome and costly because it takes time to process, and it requires handling of the solvent, treatment of dissolved N, and washing off the solvent adhering to the PE.

In particular, separating and recovering N and PE from the A1 laminate PE sheath of the dead wire was often done manually (using a heating method) because the shape and length of the dead wire were not constant.

In view of the above points, the present invention provides a separation method that is simple and can be performed at low cost.

The present invention will be explained in detail below based on FIGS. 1 to 3, which are illustrative drawings. However, it is not limited to this only. Note that Fig. 1 is a side view of the A1 laminated PE sheath (usually torn into a strip) as used in the present invention, Figs. 2 and 3 are explanatory diagrams of the method of the present invention, and Fig. 2 is a long A1 laminated PE sheath. 3 is an example of the case where a short length is used. The present invention aims to utilize the difference in elongation ratio between A1 and PE to partially peel off the N and PE sheaths, and then completely separate the remaining adhesive portion by heating.
That is, the Al-laminated PE sheath 1 is rolled with a rolling roller. 4
By applying strong pressure to the PE sheath 2
and A1 tape 3 are stretched at the same time, but when the pressure is removed, the PE sheath returns to its original state, but since the Al tape exceeds its elastic limit, it does not return to its original state and wrinkles occur in the A1 tape.

As a result, rubbing occurs between the PE sheath and the tape, the adhesive surface is destroyed, and the tape peels off at the wrinkled portion. However, at this stage, the adhesive peels off locally but not on the entire surface, so it is easily peeled off by softening the adhesive in the remaining adhesive portion by heating after passing through the rolling roller.

For this heating method, flame, hot air, electrically heated hot water, etc. 5 or 5' can be used, but it is most effective to use hot water 5'. Note that the heating temperature of the N-laminated PE sheath is above the softening point of the adhesive, and is heated to about 95° C. or more and about 120° C. or less. Also, in FIG. 2, heating is applied to the A1 tape side. In FIGS. 2 and 3, 6 indicates a supply stand, 7 indicates a straightening roller, and 8 indicates a hot water tank. According to the method of the present invention as described above, an Al tape and a PE sheath can be completely separated at low cost, without any pollution problem, and even with short lengths.

In the above description, the N-laminate PE sheath was used as an example, but the present invention is not limited to A1 tape and PE sheaths, but can be applied to the separation of metal and plastic in various metal-laminate plastic sheaths.

[Brief explanation of the drawing]

Figure 1 is a side view of the N-laminated PE sheath, Figures 2 and 3 are explanatory diagrams of the separation method of the present invention, and Figure 2 is a side view of the N-laminated PE sheath.
FIG. 3 shows examples of short objects. 1. Laminated PE sheath, 2..
・・PE sheath, 3 ・・・・A1 tape, 4 ・
... Rolling roller, 5 ... Heating means such as flame, hot air, electric heat, etc., 5' ... Heating means for boiling water,
6... Supply stand, 7... Straightening roller, 8... Tank.

Claims (1)

[Claims] 1. A method for separating metal and plastic from a metal-laminated plastic sheath, which comprises applying pressure to the metal-laminated plastic sheath with a rolling roller and then heating the metal-laminated plastic sheath. 2. A method for separating metal and plastic from a metal-laminated plastic sheath according to claim 1, wherein the metal-laminated plastic sheath is an aluminum-laminated polyethylene source. 3. A method for separating metal and plastic from a metal-laminated plastic sheath according to claim 1, wherein the temperature at which the adhesive is heated is higher than the softening temperature of the adhesive.