WO2007088984A1

WO2007088984A1 - Method of separating intermediate film

Info

Publication number: WO2007088984A1
Application number: PCT/JP2007/051834
Authority: WO
Inventors: Masahiro Hori; Toru Futagami; Kazuishi Mitani
Original assignee: Nippon Sheet Glass Company, Limited
Priority date: 2006-01-31
Filing date: 2007-01-29
Publication date: 2007-08-09
Also published as: JP2007203504A

Abstract

A method of separating an intermediate film, in which not only can separation of an intermediate film from glass be accomplished within a short period of time but also recycling of the separated intermediate film at low cost can be realized. Liquid tank (20) for use in the intermediate film separating method is equipped with container (22) for storage of intermediate film separating liquid (21) and temperature regulator (23) for regulating of intermediate film separating liquid (21) to given temperature. In the separating of intermediate film (13) from glass pieces (11,12) of laminated glass (10), first, pure water is poured as the intermediate film separating liquid (21) in the container (22), and the temperature of the poured pure water is regulated to 55°C. While immersing the laminated glass (10) in the temperature-regulated pure water, the glass pieces (11,12) of the laminated glass (10) are crushed. While immersing the laminated glass (10) with crushed glass pieces (11,12) in the pure water, extension and contraction operation involving extension of the length of laminated glass (10) to, for example, twice the original length is repeated, for example, three times.

Description

Intermediate membrane separation method

The present invention relates to an intermediate membrane separation method, and more particularly to an intermediate membrane separation method useful for recycling laminated glass. Akita

Background art

book

Conventionally, as a method of recycling laminated glass, for example, a method in which the glass of laminated glass is crushed in a state where it is adhered to a film, and then the glass and the film are separated by applying tensile strain to the film (for example, a special method) Open 2 0 0 4-1 8 1 3 2 1) or break the glass plate joined through the intermediate film, and swell the intermediate film to which the glass pieces of the crushed glass plate are attached The laminated glass is stretched by setting the feeding speed of the laminated glass by the downstream conveying roller pair to be higher than the feeding speed of the laminated glass by the upstream conveying roller pair, and the glass piece is drawn from the stretched intermediate film. A method of separating and recovering (for example, see Japanese Patent Application Laid-Open No. 2 0 2-3 2 6 8 4 9) or putting a fine crack in a laminated glass to be treated and immersing it in water A method of separating the glass from the membrane (for example, refer to Japanese Patent Application Laid-Open No. 7 _ 1 7 7 4 7), or crushing the laminated glass joined via the intermediate membrane, and then swelling the intermediate membrane with water After this, the glass piece adhered to the lower surface of the intermediate film by vibrating the conveying path while conveying the swollen intermediate film on which the glass fragments are adhered on the first conveying path made of the mesh material. Is transferred through the mesh material, and then the swollen interlayer film with glass fragments adhering to the second transport path is reversed and transferred, and the transport path is vibrated while transporting on the second transport path. To remove the glass piece adhering to the lower surface of the interlayer film. A method of collecting through the shell material (see, for example, Japanese Patent Application Laid-Open No. 2000-32-3 3 6 7 9 3), or a method in which laminated glass is crushed into cullet-like glass pieces, Both glass plate surfaces are placed between a lower glass plate separation screen that can vibrate in a substantially horizontal direction facing each other and an upper glass plate separation screen that can swing in a substantially horizontal direction. A method of causing self-excited oscillation of an intermediate film with a glass-like glass piece and an upper glass plate separation screen by loading the laminated glass in contact with each other and vibrating the lower glass plate separation screen (for example, specially (See 20 2004 — 2 6 9 2 7 8).

However, in the separation method described in Japanese Patent Application Laid-Open No. 2 04 04-18 1 3 2 1, the laminated glass is crushed by stretching the laminated glass without immersing the laminated glass in the intermediate membrane separation liquid. Since the crushed glass is separated from the intermediate film by means of this, a large lump of crushed glass can be easily removed from the intermediate film, but fine crushed glass (for example, l mm or less in diameter) can be easily removed from the intermediate film. It could not be removed. When the crushed laminated glass is expanded and contracted, the interlayer does not stretch evenly, but the portion of the crack where the glass is not adhered or the portion where the glass piece has fallen out more selectively. Thus, the difference in elongation of the intermediate film between the bonded part and the non-bonded part of the glass causes a shear stress at the interface between the glass and the intermediate film, thereby separating the intermediate film and the glass. However, if the distance between the bonded and non-bonded portions of the glass is smaller than a certain distance, there will be no difference in elongation between the bonded and non-bonded portions of the glass when stretched, resulting in shear stress. There is a problem that it is difficult to separate a glass piece of a small size simply by expanding and contracting the crushed laminated glass.

In addition, Japanese Patent Application Laid-Open No. 2 0 2-3 2 6 849, Japanese Patent Application Laid-Open No. 7-1 774 7, Japanese Patent Application Laid-Open No. 2 0 2-3 3 6 7 9 3 and JP 2 0 0 4- All of the separation methods described in Japanese Patent No. 2 6 9 2 78 have a problem that the immersion time is as long as several hours or more, and the separation process takes a long time, which is economically undesirable. Furthermore, when the intermediate film is immersed in the liquid for a long time, the intermediate film swells and deteriorates due to hydrolysis and the like, and it is difficult to recover the intermediate film in a recyclable state. It was.

That is, in the separation method described in Japanese Patent Application Laid-Open No. 2 00 2-3 2 6 8 4 9, it is immersed in water at 0 to 20 ° C. for 24 hours or about 80 ° C. in warm water at 80 ° C. After immersion for 1 hour, the laminated glass is pulled up from the liquid tank and stretched using a transfer roll with a different speed to separate the crushed glass from the intermediate film. In the separation method described in Japanese Patent Application Laid-Open No. 7-17747, the crushed glass is separated from the intermediate film by being immersed in warm water at 90 ° C. for 2 hours. In addition, in the separation method described in Japanese Patent Application Laid-Open No. 2000-2 3 3 6 7 93, after immersing in warm water at 80 ° C. for 1 hour, the laminated glass is pulled out of the liquid tank and the vibration device is installed. Used to separate the crushed glass from the interlayer. Furthermore, in the separation method described in Japanese Patent Application Laid-Open No. 2000-0 2 6 9 2 78, after immersing in warm water at 80 ° C for 3 hours, the laminated glass is pulled out of the liquid bath and crushed by vibrating. The glass is separated from the intermediate membrane.

An object of the present invention is to provide an intermediate membrane separation method capable of separating a glass and an intermediate membrane in a short time and recycling the separated intermediate membrane at a low cost. Disclosure of the invention

In order to achieve the above object, according to the first aspect of the present invention, there is provided an intermediate film separation method for separating an intermediate film in a laminated glass and a glass interposing the intermediate film, A crushing step for breaking the glass, a dipping step for immersing the laminated glass in which the glass is crushed in an intermediate membrane separation liquid, and expanding and contracting the laminated glass in which the glass is crushed in the intermediate membrane separation liquid. And an expansion / contraction step.

In the first aspect of the present invention, it is preferable that the laminated glass stretched by the expansion and contraction extends 1.2 times or more the length of the laminated glass before being stretched by the expansion and contraction.

In the first aspect of the present invention, the temperature of the intermediate membrane separation liquid is preferably equal to or higher than the glass transition temperature of the intermediate membrane.

In the first aspect of the present invention, in the expansion and contraction step, it is preferable to extend and contract the mating glass by a rotating body having a ridge on the surface. In the first aspect of the present invention, in the expansion / contraction step, it is preferable that the glass sheet is expanded and contracted by pressing with a pressing body having irregularities on the surface. In the first aspect of the present invention, it is preferable that in the stretching step, the laminated glass in which the glass is crushed is stretched in at least two directions.

1st aspect of this invention WHEREIN: It is preferable to expand and contract repeatedly the laminated glass in which the said glass was crushed in the said expansion-contraction step.

In this case, in the expansion / contraction step, it is preferable that the laminated glass in which the glass is crushed is conveyed and expanded and contracted on a conveyance path of a laminated glass constituted by a plurality of conveyors having different conveyance speeds.

In this case, it is preferable that the plurality of conveyors having different conveyance speeds include high-speed conveyors and low-speed conveyors arranged alternately with respect to the conveyance direction of the laminated glass in which the glass is crushed.

In the first aspect of the present invention, in the expansion and contraction step, it is preferable that the laminated glass in which the glass is crushed is pulled to be in an extended state, and the extended state is maintained for a predetermined time.

In the first aspect of the present invention, in the expansion and contraction step, it is preferable to expand and contract while holding the surface of the laminated glass on which the glass is crushed vertically. In order to achieve the above object, according to the second aspect of the present invention, a laminated glass is used. An intermediate membrane separation method for separating an intermediate membrane and a glass interposing the intermediate membrane, wherein an immersion step of immersing the laminated glass in an intermediate membrane separation liquid, and the laminated glass into the intermediate membrane separation liquid There is provided an intermediate membrane separation method comprising a crushing step of crushing the glass in the laminated glass while being immersed, and an expansion and contraction step of expanding and contracting the laminated glass in which the glass is crushed in the intermediate membrane separation liquid.

In the second aspect of the present invention, it is preferable that the laminated glass stretched by the expansion and contraction extends 1.2 times or more the length of the laminated glass before being stretched by the expansion and contraction.

In the second aspect of the present invention, the temperature of the intermediate membrane separation liquid is preferably equal to or higher than the glass transition temperature of the intermediate membrane.

In the second aspect of the present invention, in the expansion / contraction step, it is preferable that the glass sheet is expanded and contracted by being sandwiched by a rotating body having irregularities on the surface. In the second aspect of the present invention, in the expansion / contraction step, it is preferable that the glass sheet is expanded and contracted by pressing with a pressing body having irregularities on the surface. In the second aspect of the present invention, it is preferable that in the stretching step, the laminated glass in which the glass is crushed is stretched in at least two directions. In the second aspect of the present invention, in the expansion and contraction step, it is preferable that the laminated glass in which the glass is crushed is repeatedly expanded and contracted.

In this case, it is preferable that the plurality of conveyors having different conveyance speeds include a high-speed conveyor and a low-speed conveyor that are alternately arranged in the conveyance direction of the laminated glass in which the glass is broken.

In the second aspect of the present invention, in the stretching step, the glass is broken. It is preferable to pull the crushed laminated glass into an extended state and maintain the extended state for a predetermined time.

In the second aspect of the present invention, in the expansion and contraction step, it is preferable to expand and contract while holding the surface of the laminated glass on which the glass is crushed vertically. Brief Description of Drawings

FIG. 1 is a cross-sectional view schematically showing a configuration of a laminated glass to which an intermediate membrane separation method according to an embodiment of the present invention is applied.

FIG. 2 is a cross-sectional view schematically showing a configuration of a liquid tank used for immersing the laminated glass of FIG. 1 in an intermediate membrane separation liquid.

FIG. 3 is a diagram schematically showing the configuration of a crushing and stretching device that crushes and stretches the glass in the laminated glass of FIG.

FIG. 4 is a diagram schematically showing a configuration of a modified example of the rupture and stretching device of FIG. FIG. 5A is a cross-sectional view schematically showing a configuration of another modification of the crushing and stretching apparatus of FIG.

FIG. 5B is a diagram schematically showing the configuration of another modification of the crushing and expanding device of FIG. 3, and is a top view showing the arrangement of the protrusions.

FIG. 5C is a schematic diagram showing the configuration of another modification of the crushing and expanding apparatus of FIG. 3, and is a top view showing another arrangement of the protrusions.

FIG. 6A is a top view schematically showing a configuration of a modified example of the expansion / contraction section in the fracture expansion / contraction apparatus of FIG.

FIG. 6B is a cross-sectional view schematically showing a configuration of a modified example of the expansion / contraction portion in the crushing expansion / contraction apparatus of FIG.

FIG. 7 is a diagram schematically showing the configuration of an expansion / contraction device for expanding and contracting the laminated glass of FIG.

FIG. 8 is a diagram schematically showing a configuration of a modified example of the expansion device of FIG. BEST MODE FOR CARRYING OUT THE INVENTION

As a result of earnest research to achieve the above object, the present inventor has found that a crushing step for breaking the glass in the laminated glass, a dipping step for immersing the laminated glass in which the glass is crushed in the intermediate membrane separation liquid, and a glass When the laminated glass with crushed glass is stretched while being immersed in the intermediate membrane separation solution, the shearing stress acts on the interface between the intermediate film and the crushed glass, and the intermediate film is forcibly crushed. It is found that the glass and the intermediate membrane can be separated in a short time and the separated intermediate membrane can be recycled at a low cost by shifting the glass and shifting the intermediate membrane separation liquid to the interface at the same time. It was.

In addition, as a result of earnest research to achieve the above object, the present inventor has conducted a dipping step of dipping the laminated glass in the intermediate membrane separation liquid, and a glass in the laminated glass while dipping the laminated glass in the intermediate membrane separation liquid. When the glass is crushed and the glass is crushed, the stretched glass is stretched while being immersed in the intermediate film separation liquid. It was found that the intermediate membrane can be separated and the separated intermediate membrane can be recycled at a low cost.

In addition, as a result of earnest research to achieve the above object, the inventor of the present invention combined the penetrating force generated by immersing in the liquid and the shear stress generated by expansion and contraction and deformation by the synergistic effect. It was found that large glass pieces and small glass pieces can be separated from the intermediate film in a short time.

The present invention has been made based on the results of the above research.

Hereinafter, an intermediate membrane separation method according to an embodiment of the present invention will be described.

FIG. 1 is a cross-sectional view schematically showing the structure of a laminated glass to which the intermediate membrane separation method according to the present embodiment is applied.

In Fig. 1, the laminated glass 10 is PVB (polybulutyllar), It includes an intermediate film 13 made of a material such as EVA (ethylene acetate butyl copolymer), and glasses 1 1 and 1 2 with an intermediate film 13 interposed therebetween. When the glass 11, 1 2 in the laminated glass 10 is crushed, the broken glass pieces of the glass 11, 12 are kept in close contact with the intermediate film 13.

FIG. 2 is a cross-sectional view schematically showing a configuration of a liquid tank used for immersing the laminated glass 10 of FIG. 1 in an intermediate membrane separation liquid.

In FIG. 2, the liquid tank 20 includes a container 22 for storing the intermediate membrane separation liquid 21 and a temperature control device 23 for adjusting the intermediate membrane separation liquid 21 to a predetermined temperature.

First, pure water having a resistance value of 15 to 18 MQ / cm ² is put into the container 22 as the intermediate membrane separation liquid 21, and the temperature of the pure water is adjusted to 55 ° C. by the temperature controller 23. The glass 10 in the laminated glass 10 is immersed by the crushing device 30 described later in FIG. 3 while immersing the laminated glass 10 in the temperature-controlled pure water and immersing the laminated glass 10 in the pure water. , 1 2 is crushed into glass strips, and the laminated glass 10 in a state in which the glass strips are in close contact with the intermediate film 1 3 is immersed in pure water, for example, by an expansion / contraction device 70 described later in FIG. Repeat the expansion / contraction operation 3 times until the length of the laminated glass 10 is double the original length, for example. As a result, shear stress is generated between the intermediate film 13 and the glass strip, and the intermediate film 13 and the glass strip can be easily separated. The time taken for the weight ratio (glass residual ratio) between the total weight of glass 1 1, 1 2 and the total weight of glass 1 1, 1 2 remaining on intermediate film 13 to be less than 1% was about 2 Minutes. The expansion / contraction operation here is an operation to discontinuously stretch the glass in two directions and shrink the laminated glass 10 while the stretching operation is stopped. It ’s not something. However, the action of shrinking may be performed actively.

If the glass flakes that adhere to the intermediate film 1 3 of the laminated glass 10 to be processed are large, the intermediate film separation liquid 21 permeates up to the interfaces 14 and 15 between the glass 1 1, 1 2 and the intermediate film 13. It takes a long time to do so. W

9

Set to 5 mm ² or less. In addition, the crack reaches the interfaces 14 and 15 so that the intermediate membrane separation liquid 21 permeates sufficiently to the interfaces 14 and 15.

According to the present embodiment, while the laminated glass 10 is immersed in pure water whose temperature is adjusted to 55 ° C., the glass 11 and 12 in the laminated glass 10 are crushed and immersed in pure water 5 while being laminated. The expansion and contraction operation is repeated three times until the length of 10 becomes twice the original length, so the glass 1 1, 1 2 and the interlayer film 1 3 should be separated in a short time of about 2 minutes. Can be separated

The intermediate film 13 can be recycled at low cost.

According to the present embodiment, the laminated glass 10 is soaked in pure water 10 adjusted to 55 ° C. 10 while the glass 11 and 12 in the laminated glass 10 is crushed. The shattered glass 1 1, 1 2 is less likely to stab, the glass 1 1, 12 is less likely to remain in the intermediate film 1 3, and the intermediate film 1 3 is less likely to be damaged. In this embodiment, the glass 11 and 12 in the laminated glass 10 are broken while the laminated glass 10 is immersed in pure water. However, the present invention is not limited to this, and the glass in the laminated glass 10 is not limited to this. After breaking 1 1 and 1 2, they may be immersed in pure water.

In the present embodiment, the length of the laminated glass 10 is expanded and contracted until it becomes twice the original length. However, the length of the laminated glass 10 is not limited to this. It can be expanded and contracted until it is at least twice the length.

20 In the present embodiment, the temperature of the intermediate membrane separation liquid 21 is adjusted to 55 ° C. However, the temperature is not limited to this, and the temperature may be adjusted within a temperature range of 30 to 70 ° C. Good. In this temperature range of 30 to 70 ° C, in order to soften and easily stretch the intermediate membrane 13, it is necessary to treat it at 30 ° C or higher, which is the glass transition temperature of the intermediate membrane 13. 2 If the temperature of 1 is set to 70 ° C or higher, the intermediate film 1 3 becomes too soft and crushes.

25 Glass fragments of glass 1 1 and 1 2 are taken into the intermediate film 1 3 and the intermediate film 1 3 and the glass fragments cannot be separated efficiently. It is set. Since laminated glass 10 is covered with glass 1 1 and 1 2, the temperature of intermediate membrane separation liquid 21 can be increased from the viewpoint of heat conduction in order to efficiently raise the temperature of intermediate membrane 13. It is preferable that the glass transition temperature of 13 is higher than 30 ° C by 20 ° C or higher, that is, 50 ° C or higher.

In the present embodiment, the laminated glass 10 is expanded and contracted in two directions, but is not limited to two directions. However, it is preferable to stretch the glass 10 in two or more directions instead of one direction. Thus, the glass residue in the intermediate film 13 can be prevented by expanding and contracting the glass 10 in two or more directions.

In the present embodiment, the laminated glass 10 in which the glasses 11 and 12 are crushed is repeatedly expanded and contracted. However, the present invention is not limited to this, and the laminated glass 10 in which the glasses 11 and 12 are crushed. The operation may be performed once by pulling the into the extended state and maintaining the extended state for a predetermined time. Thus, the glass 11, 1 2 and the intermediate film 13 can be separated in a short time without repeatedly expanding and contracting the laminated glass 10 in which the glasses 11, 12 are broken.

In the present embodiment, pure water (resistance value 15 to 181ΩΖ cm ² ) is used as the intermediate membrane separation liquid 21, but the present invention is not limited to this, and as the intermediate membrane separation liquid 2 1, for example, Water or alkaline treated water dilution may be used. In addition, when alkaline treated water with a hydrogen ion concentration (pH) of 11 is used as the alkaline treated water dilution, it is expanded and contracted until the length of the intermediate film 13 becomes twice the original length. By simply repeating the expansion and contraction operation twice, the glass residual ratio can be reduced to less than 1%. Here, the alkaline treated water may contain a surfactant or a complex-forming component. +

FIG. 3 is a diagram schematically showing the configuration of a crushing / extending apparatus that crushes and expands / contracts the glasses 11 and 12 in the laminated glass 10 of FIG.

In FIG. 3, the crushing and stretching devices 30 are arranged so as to face each other. It is provided with rolls 3 1 and 3 2 for sandwiching laminated glass 10. The protrusions 3 la and 3 2 a are alternately arranged on the surfaces of the rolls 3 1 and 3 2.

According to the crushing and stretching device 30 in FIG. 3, the laminated glass 10 is sandwiched by the alternately arranged projections 3 1 a and 3 2 a, so that the glass 1 1 and 12 in the laminated glass 10 can be easily Can be crushed into pieces. Further, the rolls 3 1 and 3 2 rotate to expand and contract the laminated glass 10, whereby the intermediate film 13 and the broken glass 1 1 and 1 2 are separated. Here, the laminated glass 10 can be extended in two directions by making the rolls 3 1 and 3 2 orthogonal.

3 is composed of rolls 3 1 and 3 2, but is not limited to this, and may be gears 4 1 and 4 2 (see FIG. 4). A press 50 (see FIG. 5A) having protrusions 51a and 52a alternately arranged on the surface may be used. The protrusions 5 1 (5 2) a may be arranged as shown in FIG. 5B, or may be arranged as shown in FIG. 5C.

Further, protrusions 3 1 a and 3 2 a are formed on the surfaces of the rolls 3 1 and 3 2 in the crushing and stretching device 30 in FIG. 3, but the present invention is not limited to this. , 3 2 a may be formed with a recess.

Also, instead of expanding and contracting the laminated glass 10 with the crushing and stretching device 30 shown in FIG. 3, a sandwiching part 6 1 for sandwiching the laminated glass 10 with the crushed glass 1 1 and 12 2 and the sandwiched laminated An expansion / contraction part 60 (see FIGS. 6A and 6B) having a protrusion 62 that presses the glass 10 may be used.

In this case, first, the sandwiched glass 10 is sandwiched from above and below using the sandwiching portion 61, and the sandwiched laminated glass 10 is sandwiched from above (or alternately from above and below). ) The intermediate film 13 is expanded and contracted by pressing with the protrusion 6 2, and the intermediate film 13 is separated from the crushed glass 1 1, 1 2. Here, vibrations may be applied while pressing the sandwiched laminated glass 10 with the protrusions 62.

FIG. 7 schematically shows the configuration of the expansion device 70 for expanding and contracting the laminated glass 10 of FIG. FIG.

In FIG. 7, the telescopic device 70 is driven by high-speed conveyors 7 1 a and 7 1 b composed of mesh belts driven by a rotating body 73 having a high rotational speed and a rotating body 74 having a low rotational speed. Low-speed conveyors 7 2 a and 7 2 b composed of mesh belts. The high-speed conveyors 7 1 a and 7 lb and the low-speed conveyors 7 2 a and 7 2 b having different conveyance speeds are alternately arranged with respect to the conveyance direction of the laminated glass 10. As a result, the laminated glass 10 is conveyed on the low-speed conveyor 7 2 a, is stretched between the low-speed conveyor 7 2 a and the high-speed conveyor 7 1 a, and is further conveyed on the high-speed conveyor 7 i _a. 7 7 between the high speed conveyor 7 1 a and the low speed conveyor 7 2 b, and is further shrunk on the low speed conveyor 7 2 b, and between the low speed conveyor 7 2 b and the high speed conveyor 7 1 b 7 It is stretched by 8, and is further transported on the high-speed competitor 7 1 b.

Also, the laminated glass 10 transport path 7 5 constituted by the high-speed conveyors 7 1 a and 7 1 b and the low-speed conveyors 7 2 a and 7 2 b includes a first transport path (not shown), It has a first transport path and a second transport path (not shown) perpendicular to the transport direction.

According to the telescopic device 70 in FIG. 7, the high-speed conveyors 7 1 a, 7 1 b and the low-speed conveyors 7 2 a, 7 2 b having different conveying speeds are alternately arranged with respect to the conveying direction of the laminated glass 10. Between the low speed conveyor 7 2a and the high speed conveyor 7 1a 7 6, between the high speed conveyor 7 1a and the low speed conveyor 7 2b 7 7, between the low speed conveyor 7 2b and the high speed conveyor 7 1b The expansion and contraction of the laminated glass 10 can be easily repeated in the interval 78, so that the glasses 11 and 12 and the intermediate film 13 can be separated in a short time.

According to the telescopic device 70 of FIG. 7, the conveying path 75 of the laminated glass 10 has the first conveying path and the second conveying path perpendicular to the first conveying path and the conveying direction. The laminated glass '10 can be expanded and contracted in two directions, so that the glass residue in the intermediate film 13 can be prevented. According to the telescopic device 70 of FIG. 7, since a brush for scraping the crushed glass is not used as in the prior art, an increase in running cost due to brush wear can be eliminated.

According to the expansion and contraction device 70 in FIG. 7, the expansion and contraction of the laminated glass 10 is between the low-speed conveyor 7 2 a and the high-speed conveyor 7 1 a 7 6, and between the high-speed conveyor 7 1 a and the low-speed conveyor 7 2 b 7 7, Since it is performed between the low-speed conveyor 7 2 b and the high-speed conveyor 7 1 b 7 8, the crushed glass separated from the intermediate film 13 does not remain between the mesh belt meshes.

In the expansion and contraction device 70 of FIG. 7, the laminated glass 10 is transported by a mesh belt, but the invention is not limited to this. The rotating bodies 7 3 and 7 4 are not laminated via the mesh belt. It may be conveyed by directly pinching 0.

Further, instead of the expansion / contraction device 70, an expansion / contraction device 80 (see FIG. 8) configured to expand and contract while holding the surface of the laminated glass 10 vertically may be used. In this case, the crushed glass 1 1, 1 2 (caret) can be efficiently removed from the laminated glass 10, and when the laminated glass 10 is sandwiched again, the caret bites into the intermediate film 13. Or re-adhering to the intermediate film 13 can be prevented. Note that if the surface of the laminated glass 10 is expanded and contracted in a horizontal state, the force plate may remain between the mesh belt meshes, and the intermediate film 13 may be damaged, but the surface of the laminated glass 10 may be damaged. By extending and contracting while maintaining the vertical direction, the caret can be surely dropped, and there is no possibility of damaging the interlayer film 13 in the laminated glass 10.

In addition, the surface of the laminated glass 10 does not necessarily have to be held vertically, but may be any angle at which the force let separated from the laminated glass 10 falls substantially. If the tilt angle of the surface of the laminated glass 10 is 60 ° or more, the forcelet can be surely dropped. Also, if a flow of water is created in the submerged separation liquid to create a state in which the force plate can easily fall, the force plate can be dropped even at a smaller angle. Can be made. Industrial applicability

According to the intermediate membrane separation method of the present invention, the glass in the laminated glass is crushed, the laminated glass with the crushed glass is immersed in the intermediate membrane separation liquid, and the laminated glass with the crushed glass is immersed in the intermediate membrane separation liquid. Therefore, shearing stress is applied to the interface between the interlayer film and the crushed glass, forcibly shifting the interlayer film and the crushed glass, and simultaneously allowing the liquid to penetrate into the interface. Glass and interlayer can be separated and the separated interlayer can be recycled at low cost.

According to the intermediate membrane separation method of the present invention, the laminated glass is immersed in the intermediate membrane separation liquid, and the glass in the laminated glass is crushed while the laminated glass is immersed in the intermediate membrane separation liquid. As a result, the glass and the intermediate film can be separated in a shorter time, and the separated intermediate film can be recycled at a low cost.

According to the intermediate membrane separation method of the present invention, the laminated glass stretched by expansion and contraction is obtained by stretching the glass that has been crushed by stretching 1.2 times or more of the length of the laminated glass before being stretched by expansion and contraction. The shear stress to the interface increases, and the glass and the interlayer film can be separated in a shorter time. According to the intermediate membrane separation method of the present invention, since the temperature of the intermediate membrane separation liquid is equal to or higher than the glass transition temperature of the intermediate membrane, the intermediate glass can be softened to easily stretch the laminated glass. In addition, since the shear stress required for separation can be reduced, it is possible to suppress the intermediate film from partially breaking (breaking).

According to the method for separating an interlayer film of the present invention, the laminated glass is sandwiched and expanded and contracted by a rotating body having irregularities on the surface, so that the glass and the interlayer film are efficiently separated by expanding and contracting the laminated glass whose glass has been crushed. can do. According to the method for separating an interlayer film of the present invention, the laminated glass is pressed and stretched by the pressing body having irregularities on the surface. Therefore, the glass and the interlayer film are efficiently stretched by stretching the laminated glass whose glass has been broken. Can be separated.

According to the method for separating an interlayer film of the present invention, the laminated glass with the crushed glass is expanded and contracted in at least two directions, so that the remaining glass in the interlayer film can be prevented. In one direction, sufficient shear stress cannot be applied to the edge of the laminated glass. However, by stretching in at least two directions, sufficient shear stress can be applied to the edge of the laminated glass.

According to the method for separating an interlayer film of the present invention, the laminated glass with the crushed glass is repeatedly expanded and contracted, so that the glass and the interlayer film can be separated efficiently. If only the stretching process is used, the shear stress generated between the crushed glass and the interlayer film is attenuated, but if it is expanded and contracted, the attenuation of the shear stress can be suppressed, so that the glass and the interlayer film can be separated more efficiently. can do.

According to the interlayer separation method of the present invention, the laminated glass with broken glass is transported and expanded and contracted on the laminated glass conveyance path constituted by a plurality of conveyors having different conveyance speeds. The laminated glass can be easily stretched repeatedly, so that the glass and the interlayer film can be separated efficiently.

According to the intermediate film separation method of the present invention, the plurality of conveyors having different conveyance speeds are composed of the high-speed conveyor and the low-speed conveyor alternately arranged in the conveyance direction of the laminated glass in which the glass is crushed. The laminated glass thus obtained can be repeatedly expanded and contracted efficiently, so that the glass and the interlayer film can be separated efficiently.

According to the interlayer separation method of the present invention, the laminated glass with the crushed glass is stretched to be in an elongated state, and the stretched state is maintained for a predetermined time. Therefore, even if the laminated glass with the crushed glass is not repeatedly expanded and contracted, Separation of glass and interlayer film in a short time Can.

According to the interlayer separation method of the present invention, since the glass is crushed while being stretched while holding the surface of the laminated glass vertically, the crushed glass can be efficiently removed from the conveyance path.

Claims

The scope of the claims

1. An intermediate film separation method for separating an intermediate film in a laminated glass and a glass interposing the intermediate film, a breaking step for breaking the glass in the laminated glass, and a laminated glass in which the glass is crushed An intermediate membrane separation method comprising: an immersion step of immersing the glass in an intermediate membrane separation liquid; and an expansion and contraction step of expanding and contracting the laminated glass with the glass crushed in the intermediate membrane separation liquid.

2. The interlayer separation method according to claim 1, wherein the laminated glass stretched by the expansion and contraction extends 1.2 times or more of a length of the laminated glass before being stretched by the expansion and contraction.

3. The intermediate membrane separation method according to claim 1, wherein the temperature of the intermediate membrane separation liquid is equal to or higher than the glass transition temperature of the intermediate membrane.

4. The interlayer separation method according to claim 1, wherein, in the expansion and contraction step, the laminated glass is expanded and contracted by being sandwiched by a rotating body having irregularities on the surface.

5. The interlayer separation method according to claim 1, wherein, in the expansion and contraction step, the laminated glass is expanded and contracted by being pressed by a pressing body having an uneven surface.

6. The interlayer separation method according to claim 1, wherein, in the stretching step, the laminated glass in which the glass is crushed is stretched in at least two directions.

7. The intermediate membrane separation method according to claim 1, wherein in the stretching step, the laminated glass in which the glass is crushed is repeatedly stretched.

8. The intermediate membrane separation method according to claim 7, wherein in the expansion and contraction step, the laminated glass in which the glass is crushed is conveyed and expanded and contracted on a laminated glass conveyance path constituted by a plurality of conveyors having different conveyance speeds.

9. The intermediate film separation method according to claim 8, wherein the plurality of conveyors having different conveyance speeds include a high-speed conveyor and a low-speed conveyor arranged alternately with respect to a conveyance direction of the laminated glass in which the glass is crushed.

10. The intermediate membrane separation method according to claim 1, wherein, in the expansion and contraction step, the laminated glass in which the glass is crushed is pulled into an extended state, and the extended state is maintained for a predetermined time.

1. The intermediate membrane separation method according to claim 1, wherein in the expansion and contraction step, the glass is crushed while maintaining a vertical surface of the laminated glass.

1 2. An intermediate membrane separation method for separating an interlayer film in a laminated glass and a glass interposing the interlayer film, wherein the laminated glass is immersed in an interlayer separation liquid; An intermediate membrane separation method comprising: a crushing step for crushing the glass in the laminated glass while being immersed in an intermediate membrane separation liquid; and an expansion and contraction step for expanding and contracting the laminated glass with the glass crushed in the intermediate membrane separation liquid. .

13. The interlayer separation method according to claim 12, wherein the laminated glass stretched by the expansion and contraction extends 1.2 times or more of a length of the laminated glass before being stretched by the expansion and contraction.

14. The intermediate membrane separation method according to claim 12, wherein the intermediate soot separation liquid has a temperature equal to or higher than a glass transition temperature of the intermediate membrane.

15. The intermediate membrane separation method according to claim 12, wherein, in the expansion / contraction step, the laminated glass is expanded and contracted by being sandwiched by a rotating body having irregularities on the surface.

16. The intermediate membrane separation method according to claim 12, wherein, in the expansion / contraction step, the laminated glass is expanded and contracted by being pressed by a pressing body having an uneven surface.

17. The intermediate membrane separation method according to claim 12, wherein, in the expansion and contraction step, the laminated glass in which the glass is crushed is expanded and contracted in at least two directions.

18. The intermediate membrane separation method according to claim 12, wherein in the stretching step, the laminated glass in which the glass is crushed is repeatedly stretched.

1 9. In the expansion and contraction step, the laminated glass in which the glass is crushed is a laminated glass conveyance path constituted by a plurality of conveyors having different conveyance speeds The intermediate membrane separation method according to claim 18, wherein the intermediate membrane is expanded and contracted.

20. The intermediate film separation method according to claim 19, wherein the plurality of conveyors having different conveyance speeds include high-speed conveyors and low-speed conveyors arranged alternately with respect to a laminated glass conveyance direction in which the glass is crushed.

21. The intermediate membrane separation method according to claim 12, wherein, in the expansion and contraction step, the laminated glass in which the glass is crushed is pulled into an extended state, and the extended state is maintained for a predetermined time.

2 2. The intermediate membrane separation method according to claim 12, wherein in the expansion and contraction step, the glass is crushed while maintaining a vertical surface of the laminated glass.