JPH06247752A - Separation of glass of laminated glass from layer - Google Patents

Abstract

PURPOSE:To separate and take out the glass of a laminated glass from the intermediate layer so that the glass is reutilized. CONSTITUTION:A laminated glass is finely cracked, the intermediate layer is made hydrous through the cracks to reduce the adhesive strength of the layer and the glass of the laminated glass is separated and taken out from the layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated glass detached from a scrapped vehicle or a building to be demolished, or a method for separating a film of defective laminated glass generated in a manufacturing process from the glass.

[0002]

2. Description of the Related Art When an automobile is scrapped or a building is demolished, the glass attached to the window is discarded as shredder dust together with the rubber material and the like around the window. .

In recent years, the reuse of window glass for automobiles and the like has been studied from the viewpoint of environmental problems and resource reuse. In this case, for example, the windshield of an automobile is usually composed of two glass plates. Since it is a laminated glass joined with a resin film (hereinafter referred to as a film), in order to reuse it, it is necessary to separate the glass and the film and recover only the glass.

Conventionally, the separation of such laminated glass has been
By roll crusher and impact crusher,
A method is known in which a laminated glass removed from an automobile is crushed and the glass is separated from the membrane (see JP-A-49-31722).

[0005]

However, the above method has a drawback that a thin glass layer remains on the membrane surface after crushing and the separation performance is not sufficient.

Therefore, the applicant has previously cooled the laminated glass for separating and recovering the glass to −10 ° C. or lower,
We proposed a method to reduce the adhesive strength of the membrane for separation. This method has no problem in separating the glass from the membrane,
There is a problem that the cost is inevitably increased because a cooling device is required.

The present invention is intended to solve such problems, and an object thereof is to provide a method for easily separating glass from a membrane.

[0008]

According to the present invention, a film for laminated glass, particularly a polyvinyl butyral film generally used as this film, swells and becomes cloudy when water is contained, and the adhesive force to glass disappears or decreases. Focusing on that,
The glass is separated from the film when the adhesive strength is weakened in this way.

That is, according to the present invention, the laminated glass to be treated is preliminarily cracked, and then the crack is used to cause the membrane to be hydrated, whereby the glass is separated from the membrane in a state where the adhesive strength of the membrane is lost or lowered. It is to be collected.

The laminated glass which is the object of the present invention is a laminated glass for automobiles or constructions in which the glass is to be recycled. Usually, two glass plates are joined by a polyvinyl butyral film. Is not limited to this polyvinyl butyral, but there is also one in which two glass plates are joined by a film of ethylene vinyl acetate copolymer or the like, and a type in which a synthetic resin film such as urethane resin is attached to one surface of the glass plate. Including laminated glass.

According to the method of the present invention, a step of making fine cracks in the laminated glass to be treated, a step of utilizing the cracks to hydrate the film to reduce the adhesive force of the film, and separating the glass from the film. And the process.

The laminated glass to be treated is firstly microcracked. In this method, a pressing method in which upper and lower dies having irregularities are pressed, or when upper and lower pressing rolls are arranged in a zigzag manner and laminated glass is inserted between these rolls, the glass is bent by these rolls and crushed. There is a conveyor system with folding rolls. Further, in the case of the latter conveyor system, a vertical pressing roll is constituted by a Soroban roll having protrusions provided on the rotary shaft at predetermined intervals, and the protrusions of these upper and lower rolls are combined in a zigzag pattern, and a glass is provided between them. When the glass is passed through, the bending force may be exerted by the protruding portion in the width direction thereof, and the glass may be continuously shredded.

The glass provided in the laminated glass is crushed into small pieces while being adhered to the film by the cracks provided to the laminated glass. However, the size of the small pieces is not particularly limited. it takes a long time to the water to the membrane, the size of the strip is preferably about 25mm ² ~1000mm ^2. Further, the crack reaches this joint surface so that water can sufficiently penetrate into the joint surface between the glass and the film. When cracking a laminated glass which is curved like a window glass of an automobile by a conveyor system, it may be made into a flat plate shape by a flat press in advance.

The water content of the film is usually easily obtained by placing a cracked laminated glass in a water tank and immersing it. When placed in a water tank, the film will contain water from the cracks.The cracks of the film first become cloudy in a mesh shape, and this cloudy part gradually penetrates toward the inside, and when the entire surface turns white, the film adheres. There is almost no power.

The time required to hydrate the entire film varies depending on the size of cracks and the like, but the film is immersed for several hours to several days. Even if the whole area of the membrane is hydrated and the whole is not clouded, the adhesive strength to the glass is lowered, so that the glass is easily separated from the membrane by applying some external force to the glass.

In this case, if the water temperature is raised, the water content of the film is promoted and the time required for clouding becomes shorter. Although not usually required, a trace amount of a surfactant or the like may be added if necessary in order to facilitate the permeation of water from the cracked portion into the film surface which is the bonding surface with the glass or into the film.

Next, the separation of the membrane and the glass will be described.
Since the adhesive force of the film disappears or decreases due to water content, the glass naturally separates due to its own weight, etc., and the glass flow is caused to act on the laminated glass in the water tank to separate the glass from the film. can do. As a method for obtaining hydraulic power, the water in the water tank is stirred, or the laminated glass is rotated in the water tank while suspending a part thereof, for example. Particularly, in the former case, if a water tank with a screen of about 50 mm is attached to the lower part, the separated glass pieces fall under the screen, and the film remains on the screen, and can be easily separated and collected.

When a water tank is used to contain water in the membrane, a stirring means may be provided in this water immersion tank to serve also as a stirring tank for separating the glass from the membrane. Further, for the separation of the glass, high-pressure water or high-pressure air may be blown onto the laminated glass taken out from the immersion tank, and an ultrasonic oscillator may be provided in the water tank to promote the separation of the glass and the membrane by the ultrasonic waves. it can. Further, the film separated from the glass according to the present invention is not limited to the polyvinyl butyral film exemplified above, and may be, for example, a vinyl acetate copolymer or a urethane resin film as described above. If the film has a reduced adhesive strength, the separation of the glass and the film can be carried out in the same manner.

[0019]

As described above, according to the present invention, the adhesive force of the film is lost or reduced by causing cracks in the laminated glass to be separated and recovered from the glass and allowing the film to contain water through the cracks. The glass can be easily separated and collected from the membrane. Since the glass is crushed into glass pieces having a predetermined size due to the generation of cracks, the glass separated and recovered from the film can be used as it is as a glass raw material. Moreover, since it can be carried out only by means for generating a crack in the laminated glass and the water tank, the cost for the equipment can be kept low, and the separation and recovery work thereof is extremely simple.

In particular, when cracks applied to the glass surface of the laminated glass are adjusted and there is a portion having a coating layer such as black ceramic paint on the glass surface, the size of the glass strip of the coating portion is large. By setting the thickness larger than other parts, the peeling time between the film and the glass can be adjusted, and when the adhesive force of the film in the part without the coating layer is reduced, the glass and film are separated. By doing so, it is possible to easily recover only the glass portion (the portion not including the coating layer) suitable for reusing the glass.

Claims (4)

[Claims] 1. A method for separating a laminated glass film from a glass, wherein the glass is separated from the film in a state where the adhesive force to the glass is lowered by giving cracks to the laminated glass and then making the film contain water. 2. A laminated glass is provided with fine cracks having a depth reaching from the surface of the glass to the film, and the glass portion of the laminated glass is made into a mesh-like strip. 2. The method of separating a laminated glass membrane and glass according to claim 1, wherein water is permeated into the membrane surface and inside the membrane to reduce the adhesive strength of the membrane. 3. A laminated glass with cracks is put in a water tank and sufficiently immersed in water, and water is permeated through the cracks into the membrane surface and the membrane, which are the joint surfaces between the glass and the membrane, to improve the adhesive strength of the membrane. 3. The glass and the membrane are separated by applying an external force after lowering the glass and the membrane.
Method for separating laminated glass film and glass. 4. A laminated glass, the adhesive strength of which has been lowered by immersing the membrane in water, whereby a water flow is applied in water to separate the glass from the membrane by the hydraulic force generated at that time. A method for separating a laminated glass film and glass from any one of 1 to 3.