JPS5840143A - Method for peeling composite layered material - Google Patents

Abstract

PURPOSE:To make it possible to miniaturize an installation, by a method wherein a peeling promoting substance is penetrated into a composite layered substance to be peeled and the treated composite layered substance to be peeled is immersed in a heating medium or a cooling medium. CONSTITUTION:A metal body 1 is immersed in a heating medium or a cooling medium accommodated in a container 2 and kept therein until the temp. of said metal body 1 reaches the temp. of the heating medium or the cooling medium. Subsequently, the metal body 1 is withdrawn from the container 2 and immersed in a peeling promoting substance (e.g. water) filled by a container 3. The metal body 1 is again immersed in the heating medium or the cooling medium and, when the temp. of the metal body 1 reaches the temp. of the heating medium or the cooling medium, the two layered metal body 1 is taken up therefrom to separate the same into each metal bodies.

Description

[Detailed description of the invention] This invention relates to a method for peeling off layered materials.

Conventional methods are used to separate and recover multilayer metal objects.

J of heat peeling, water quenching, ultrasonic and peed blasting, etc.
The i method, a method of peeling by submerging in liquid nitrogen, and a method of using mechanical vibration are considered.

However, the mechanical peeling method has disadvantages in that it damages the substrate and scatters the metal particles to be peeled over a wide area, and also requires a large-scale apparatus. The thermal peeling method is effective, for example, when the two-layer metal body has a very large coefficient of thermal expansion, but on the other hand, when the coefficients of thermal expansion are small, complete peeling is difficult.

In view of these points, the present invention is possible with small-scale equipment,
Moreover, the main purpose of this invention is to propose a suitable peeling method that can be applied to peeling off metal bodies having mutually small coefficients of thermal expansion.

An embodiment of the method of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a two-layer metal body. This metal body 1 is
As shown in Figure A, the metal body 1 is immersed in a heat/refrigerant, such as liquid nitrogen, filled in a container 2 and held until the metal body 1 becomes isothermal with the heat/refrigerant. At this stage.

Permanent strain including minute cracks occurs in each metal body, but when both metal bodies have small coefficients of thermal expansion, separation does not occur. Next, as shown in FIG. 2B, the metal body 1 is pulled up from the container 2 and immersed in a peel-promoting substance, such as tap water, filled in the container 3. The peel-off promoting substance penetrates through the cracks on each metal surface. In addition, in order to better penetrate the peeling promoting substance,
This is carried out by applying pressure or reduced pressure to the peel-promoting substance.

Next, the metal body 1 is immersed in the heat/coolant again, and when the metal body 1 becomes isothermal with the heat/coolant, the two-layer metal body 1 is pulled up. The barrel of water undergoes a rapid volume change into ice and separates into metal bodies. In addition to water, the use of a mixture of water-ethanol or water=surfactant as the release-promoting substance contributes to its penetration into each metal body.

As described above, according to the present invention, a peel-promoting substance is infiltrated into a multi-layer material to be peeled, and then the multi-layer material to be peeled is heated.
Since it is configured to be immersed in a refrigerant, it is possible to peel off substances made of multiple layers of different materials, and in particular, it is possible to peel off multilayer metal bodies with mutually small coefficients of thermal expansion. . Further, when water is used as the peeling promoting substance, contamination of the metal to be peeled and recovered can be minimized.

It goes without saying that the multilayer material to be peeled includes organic and inorganic materials in addition to the metal body.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a multilayer metal body, and FIG. 2 is a diagram showing an example of the procedure of the method of the present invention. Agent: Takashi Akiyama

Claims (1)

[Claims] 1. A method for peeling a multi-layer material, which comprises infiltrating a multi-layer material to be peeled with a peel-promoting substance, and then immersing the multi-layer material to be peeled in heat/coolant.