JP2019055363A - Laminated glass peeling device and peeling method - Google Patents

Abstract

To provide a laminated glass peeling device capable of parting a glass sheet from laminated glass in short time, and a method for glass peeling from laminated glass.SOLUTION: The laminated glass peeling device contains a laser oscillator and a first optical system having at least one lens, wherein the first optical system irradiates a first laser beam emitted from the laser oscillator to a sealant on an inner surface of the laminated glass and the first laser beam is irradiated while scanning only in uniaxial direction parallel to the lengthwise direction of the spacer of the laminated glass; and the method for glass peeling from laminated glass is characterized by that the first laser beam is irradiated while scanning only in uniaxial direction parallel to the lengthwise direction of the spacer of the laminated glass to decrease adhesive force of the sealant.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a peeling apparatus and a peeling method for peeling a glass plate from a multilayer glass.

Multi-layer glass is used for heat insulation, sound insulation, heat insulation, crime prevention and the like. FIG. 3 shows a cross-sectional structure of the end portion of the multilayer glass.
The double-glazed glass 2 is usually one in which a first glass plate 21a and a second glass plate 21b are bonded with a primary sealing material 231 via a spacer 22, and a secondary sealing material 232 is filled therearound. (Hereinafter, the primary sealing material 231 and the secondary sealing material 232 are simply referred to as the sealing material 23). A space between the first glass plate 21a and the second glass plate 21b is a hollow layer, and dry air or the like is sealed.

The spacer 22 is made of an aluminum alloy having a substantially U-shaped cross section, and a desiccant (not shown) is disposed inside the spacer 22. The desiccant is not particularly limited, but generally zeolite is used.
For the primary sealant 231, a butyl adhesive or the like having a high moisture permeability resistance is used in order to maintain the dryness of the hollow layer. As the secondary sealant 232, a silicone-based adhesive, a polysulfide-based adhesive, a hot-melt-based adhesive, a urethane-based adhesive, or the like is used depending on the climate of the region where the double-glazed glass is used, the environment of the installation location, and the like. Silicone adhesives and polysulfide adhesives, which are excellent in handling properties, are common.

  The double-glazed glass is expensive because it has a complicated structure as described above, and has been used mainly in large buildings such as office buildings and hotels. However, in recent years, the high energy saving effect due to the improvement of the cooling and heating efficiency has been evaluated, and it is also spreading to ordinary houses.

  Here, when the building is repaired, demolished, etc., glass is generated as waste. Glass is crushed and recycled as a glass cullet, but the glass cullet is required to contain a small amount of foreign matter in order to prevent deterioration of the quality of glass products produced by reusing the glass cullet. For example, the plate glass association prescribes an acceptable amount of organic compounds of 20 ppm or less as the quality of receiving glass cullet as a plate glass raw material. Since the double-glazed glass has a spacer, a sealing material, a desiccant, and the like, if it is crushed as it is, foreign matter is mixed in. In addition, since it is difficult to separate only the glass plate from the multilayer glass, most of the discarded multilayer glass is landfilled without being reused as glass cullet.

  In order to recycle the multi-layer glass, it is required to separate the glass plate from the multi-layer glass so that the amount of foreign matter mixed is small. For example, Patent Document 1 irradiates the multi-layer glass with near infrared rays. A glass separation treatment method has been proposed in which a glass part is permeated and an adhesive is softened or denatured by heating an adhesive part (sealing material) to separate the glass from a support member (spacer). In Patent Document 2, a laser beam is irradiated to the sealing material (sealing material) from the outside of the multi-layer glass to eliminate the adhesive strength of the sealing material, and the two glasses are separated from the sealing material. A method of decomposing a multi-layer glass has been proposed.

Since the method described in Patent Document 1 heats the part other than the bonded part, the loss of heat energy is large, and a compound using a glass plate with low near-infrared transmittance such as heat insulating glass, heat shielding glass, heat ray absorbing glass, etc. When processing layer glass, energy consumption further increases. Moreover, since it is necessary to heat the whole glass simultaneously, there exists a problem that an apparatus enlarges and the glass size made into object is restrict | limited. Furthermore, there is a problem that a part of the adhesive tends to remain on the peeled glass plate, and the quality of the obtained glass cullet is low and unstable.
In the method described in Patent Document 2, scanning is performed along the length direction of the spacer while the laser beam is reciprocated (scanned) in the width direction of the spacer, so that there is a limitation in speeding up. In addition, since the optical system is constantly driven, if there is a drive system for scanning the multi-layer glass or vibration from outside the apparatus, the irradiation position accuracy is lowered, and peeling may be adversely affected. Further, in Patent Document 2, the height of the laser pulse per unit area called “beam intensity” (hereinafter referred to as a general term “peak power density”) is used as an index of laser intensity. According to the study by the inventors, it is not the peak power density but the energy density (fluence) per unit area that contributes to the peeling condition of the multilayer glass. Therefore, when the laser light irradiation conditions are set according to the peak power density, the glass plate may not be peeled off or the irradiation energy amount may be excessive. If the amount of irradiation energy is excessive, the amount of gas generated by the decomposition of the sealing material increases, and there is a risk that this gas may be ignited or explode by the heat of the laser.

JP 2009-50801 A JP 2008-155197 A

  An object of the present invention is to provide a multilayer glass peeling apparatus capable of separating a glass plate from a multilayer glass in a short time and a glass peeling method from the multilayer glass.

Means for solving the problems of the present invention are as follows.
1. A laser oscillator and a first optical system comprising at least one lens;
The first optical system irradiates the sealing material on the inner surface of the multilayer glass with the first laser light emitted from the laser oscillator,
The multi-layer glass peeling apparatus, wherein the first laser beam is irradiated while scanning only in a uniaxial direction parallel to a length direction of the multi-layer glass spacer.
2. The oscillation wavelength of the laser oscillator is 330 nm or more and 2800 nm or less. The multilayer glass peeling apparatus as described in any one of.
3. 1, wherein the energy density in the double-glazing surfaces of the first laser light is 4J / cm ² or more 840J / cm ² or less. Or 2. The multilayer glass peeling apparatus as described in any one of.
4). When the width in the direction parallel to the length direction of the spacer is d1 and the width in the direction parallel to the width direction of the spacer is d1 in the irradiation region of the first laser beam on the surface of the multilayer glass, d1 <D2 characterized in that 1. ~ 3. A multilayer glass peeling apparatus according to any one of the above.
5. The center of the irradiation region of the first laser beam is located on the primary sealing material. ~ 4. A multilayer glass peeling apparatus according to any one of the above.
6). Having a second optical system,
Said 2nd optical system irradiates the side surface of the glass plate which comprises the said multilayer glass from the center side of the said multilayer glass with a 2nd laser beam. ~ 5. A multilayer glass peeling apparatus according to any one of the above.
7). 1. The irradiation region by the first optical system and the irradiation region by the second optical system do not overlap. ~ 6. A multilayer glass peeling apparatus according to any one of the above.
8). Irradiate the first laser beam to the sealing material of the multilayer glass from a direction perpendicular to the plane of the multilayer glass,
The first laser beam is irradiated while scanning only in a uniaxial direction parallel to the length direction of the spacer of the multilayer glass, thereby reducing the adhesive force of the sealing material. A method for peeling a glass plate from glass.
9. The second laser beam is irradiated from the center side of the multilayer glass to the side surface of the multilayer glass. The glass plate peeling method as described in any one of.

  The multi-layer glass peeling apparatus of the present invention irradiates the laser beam while scanning only in one axial direction parallel to the length direction of the multi-layer glass spacer, thereby simplifying the apparatus, reducing the cost, and processing speed. High speed can be achieved. The laser beam is irradiated so that the width of the irradiation region in the direction parallel to the length direction of the spacer is d1, and the width in the direction parallel to the width direction of the spacer is d2, so that d1 <d2. Thus, the energy density can be increased and processing can be performed at higher speed. By irradiating the laser beam so that the center of the irradiation region is positioned on the primary sealing of the multilayer glass, the primary sealing material having a higher decomposition rate can be efficiently heated. By irradiating the side surface of the glass plate with the second laser light, the amount of organic matter mixed in the glass plate can be reduced, and the glass plate from the multilayer glass can be easily peeled off.

Schematic at the time of laser beam irradiation by the multilayer glass peeling apparatus which is one embodiment of this invention. The perspective view which seems to irradiate a multilayer glass with the laser beam using the multilayer glass peeling apparatus which is one embodiment of this invention. The schematic diagram which shows the cross-section of a multilayer glass edge part.

The present invention includes a laser oscillator and a first optical system including at least one lens. When the first laser light from the first optical system is irradiated onto the sealing material on the inner surface of the multilayer glass, The present invention relates to a multi-layer glass peeling apparatus in which one laser beam is irradiated while scanning only in one axial direction parallel to the length direction of a multi-layer glass spacer.
In addition to the laser oscillator and the optical system, the multilayer glass peeling apparatus of the present invention can include a transport device, a shield, a sensor, a dust collector, an exhaust device, a window or a camera for monitoring the inside of the device, and the like.

In FIG. 1, the schematic at the time of the laser beam irradiation by the multilayer glass peeling apparatus which is one embodiment of this invention is shown. Moreover, the perspective view at the time of irradiating a laser beam to a multilayer glass using the multilayer glass peeling apparatus which is one embodiment of this invention in FIG. 2 is shown. In addition, in FIGS. 1-3 of this invention, the same code | symbol is attached | subjected to the same member.
Hereinafter, the multilayer glass peeling apparatus of this invention and the glass plate peeling method are demonstrated to the multilayer glass peeling apparatus 1 which is one embodiment shown in FIG.

  A multi-layer glass peeling apparatus 1 according to an embodiment includes a laser oscillator 11, a beam splitter 12 that branches the laser light L0 emitted from the laser oscillator 11 into a first laser light L1 and a second laser light L2, A first optical system 13 that includes a convex lens 131 and a cylindrical lens 132 and guides the first laser light L1, and a second optical system 14 that includes a mirror 143, a convex lens 141, and a cylindrical lens 142 and guides the second laser light L2. Have

The laser oscillator preferably has an oscillation wavelength of 330 nm or more and 2800 nm or less. If it is this oscillation wavelength, it has the high transmittance | permeability with respect to float glass. In addition to float glass, glass sheets of double-layer glass include heat insulating glass, heat shielding glass, heat ray absorbing glass, template glass, netted glass, tempered glass, laminated glass, laminated tempered glass, fireproof glass, rubbing glass, etc. Sometimes used. In order to have high transmittance with respect to these various glasses, the oscillation wavelength is more preferably from 330 nm to 1100 nm, further preferably from 350 nm to 650 nm, and most preferably from 450 nm to 550 nm. Specifically, Nd: YAG laser (1064 nm, 532 nm, 355 nm), He—Ne laser (633 nm), Ar ion laser (514.5 nm, 488 nm), Nd: YVO ₄ laser (1064 nm, 532 nm, 355 nm), semiconductor A laser, a fiber laser, or the like can be preferably used.

The first optical system 13 expands the first laser beam L1 so as to have a diameter equal to or larger than the full width (W in FIG. 1) of the sealing material 23 on the inner surface of the multilayer glass, and the first laser beam L1. Is irradiated onto the sealing material 23 on the inner surface of the multilayer glass while scanning only in one axial direction (direction of arrow A in FIG. 2) parallel to the length direction of the spacer 22.
In the multilayer glass peeling apparatus according to one embodiment, the first optical system 13 includes a convex lens 131 and a cylindrical lens 132. The convex lens 131 and the cylindrical lens 132 can be moved separately in the optical axis direction, and the size and flatness of the irradiation region of the first laser light L1 can be adjusted by moving each of them.

In the multilayer glass peeling apparatus 1 according to one embodiment, the second optical system 14 transmits the second laser light L2 from the center side of the multilayer glass to the secondary sealing material 232 on the side surface of the first glass plate 21a. Is irradiated. The second laser light L2 is irradiated while scanning only in the uniaxial direction (in the direction of arrow A in FIG. 2) parallel to the length direction of the spacer of the double-glazed glass together with the scanning of the first laser light L1.
In the multilayer glass peeling apparatus according to one embodiment, the second optical system 14 includes a mirror 143, a convex lens 141, and a cylindrical lens 142. The convex lens 141 and the cylindrical lens 142 can be moved separately in the optical axis direction, and the size and flatness of the irradiation region of the second laser light L2 can be adjusted by moving each of them.

  Here, in the multilayer glass peeling apparatus 1 which is one embodiment, the first laser beam L1 and the second laser beam L2 are branched from the same laser beam L0. Therefore, the first laser light L1 and the second laser light L2 have a long coherence length, and interference fringes are likely to occur when the irradiation regions overlap. When interference fringes occur, sufficient laser light may not be irradiated in the dark area of the stripes, and the surface of the sealing material may not be sufficiently heated. Therefore, the irradiation areas of the first laser light L1 and the second laser light L2 are different. It is preferable not to overlap.

  In the multilayer glass peeling apparatus of the present invention, the configuration of the first optical system and the second optical system is not limited to the above-described embodiment, and includes a convex lens, a concave lens, an aspherical lens, a cylindrical lens, a rod lens, a Powell lens, A mirror, a prism, a beam splitter, a wave plate, a polarizing plate, a diffraction grating, and the like can be combined as appropriate. For example, the first laser beam and the second laser beam can be branched after the irradiation area is enlarged with a convex lens or the like. Further, the first laser beam and the second laser beam can be irradiated from separate laser oscillators. Furthermore, a single laser beam can be applied to the inner surface of the thin glass layer and the side surface of the glass plate.

  The multilayer glass peeling device of the present invention irradiates the first laser light on the multilayer glass sealing material while scanning only in a uniaxial direction parallel to the length direction of the spacer. The first laser light passes through the glass and efficiently heats the surface of the sealing material. Since the multilayer glass peeling apparatus of the present invention uses a laser for heating the sealing material, local heating is possible, and processing with a small amount of energy is possible. In addition, since the first laser beam is not scanned in the width direction of the spacer, the heat treatment time can be shortened. Furthermore, since the multi-layer glass peeling apparatus of the present invention does not require a drive system for scanning the laser beam in the width direction of the spacer, the structure is simple and there is no adverse effect due to vibration. Note that the scanning of the first laser beam can be performed by moving one or more of the multilayer glass peeling device, the optical system, and the multilayer glass in a uniaxial direction.

  In the multilayer glass peeling apparatus of the present invention, the second laser beam L2 can be irradiated to the side surface of the glass plate from the center side of the multilayer glass. By irradiating the side of the glass plate with the second laser light from the center side of the multi-layer glass, excess sealing material adhering to the side of the glass plate can be removed during manufacturing, and the amount of foreign matter is very small It can be a glass cullet. Moreover, a glass plate can be peeled from a multilayer glass with little force, and workability | operativity can be improved.

First and second laser beam is preferably irradiated at an energy density of 840J / cm ² or less 3J / cm ² or more with respect to multiple glazing surface. When the energy density is less than 3 J / cm ² , the adhesive strength of the sealing material is not sufficiently lowered, and when the energy density is greater than 840 J / cm ² , a large amount of gas is generated by pyrolysis of the sealing material, and this gas is ignited. The risk of explosion. Here, various glass, such as float glass, heat ray absorption glass, Low-E glass, template glass, and netted glass, is used for the multi-layer glass, and the transmittance of laser light differs depending on the glass. Therefore, in order to peel the glass without adjusting the irradiation intensity of the laser beam according to the type of glass, the energy density of the laser beam on the surface of the multilayer glass is more preferably 15 J / cm ² or more, and 20 J / More preferably, it is cm ² or more.

Here, it is known that the energy density in a general laser light irradiation region is not uniform and approximates a Gaussian distribution with a strong central portion and a weak peripheral portion. That is, the energy density of the laser beam is large at the center of the irradiation region and small at the peripheral portion of the irradiation region. In addition, since the sealing material usually has a width of about 10 mm, the energy density of the laser light applied to the sealing material differs in the spacer width direction, and is large at the portion where the center portion of the laser light passes, and the peripheral portion of the laser light. It becomes smaller in the part where passes. Therefore, the entire surface of the sealing material, the energy density of the laser beam to be irradiated is preferably irradiated such that the 4J / cm ² or more 840J / cm ² or less.

  In the multi-layer glass peeling apparatus of the present invention, the irradiation region of the first laser beam is parallel to the length direction of the spacer when the irradiation region of the first laser beam is also irradiated. It is preferable that d1 <d2, where d1 is the width in the direction (arrow A in FIG. 2) and d2 is the width in the direction parallel to the width direction of the spacer. Examples of such a shape include an ellipse, a straight line, and a rectangle. There is no particular limitation on the method of making the laser beam in such a shape, and the optical system is a convex lens, concave lens, aspheric lens, cylindrical lens, rod lens, Powell lens, mirror, prism, beam splitter, wave plate, polarizing plate, diffraction. A method of incorporating a lattice or the like is mentioned. For example, when a laser beam having a circular cross section perpendicular to the optical axis direction is irradiated from an oblique direction, the irradiation area becomes an ellipse. In this way, the laser beam is irradiated from an oblique direction to the surface of the multilayer glass. Thus, a shape satisfying d1 <d2 can be obtained. By making the laser light irradiation area into a shape that satisfies d1 <d2, the energy density at the end of the irradiation area (end in the d2 direction) can be increased, and the energy density above the minimum necessary value on the entire surface of the sealing material. Can be efficiently irradiated.

  Here, as shown in FIG. 3, as the sealing material, a butyl adhesive is used as the primary sealing material 231 on the glass center side, and a silicone adhesive or a polysulfide adhesive is used as the secondary sealing material 232 on the outside of the glass. It is common. Since the butyl adhesive has a higher decomposition temperature than the silicone adhesive and the polysulfide adhesive, the first irradiates the sealing material on the inner surface of the multilayer glass so that the butyl rubber as the primary sealing material is heated more strongly. The center of the laser beam is preferably located on the primary sealing material.

  In addition, the multilayer glass processing apparatus of this invention is not limited to one embodiment shown in FIG. 1, For example, it can be set as the structure which irradiates a laser beam to both surfaces of a multilayer glass simultaneously. Examples of such a device configuration include a configuration in which a laser oscillator and an optical system are arranged on both sides of a multilayer glass, a beam splitter or the like is incorporated in the optical system, and one laser beam is divided into two. By simultaneously irradiating both surfaces of the multilayer glass with laser light, the processing time can be shortened.

"Example 1"
Three wavelengths commonly used in laser processing (10.6 μm (CO ₂ laser), 1064 nm (YAG laser), 532 nm (second harmonic of YAG laser)), primary sealing material is butyl rubber, A double-glazed sealant having a glass plate of type A float glass whose secondary sealant is polysulfide was irradiated under the condition of an energy density of 3 J / cm ² .

The glass plate could be peeled from the multi-layer glass irradiated with laser beams having wavelengths of 1064 nm and 532 nm. On the other hand, the glass plate could not be peeled off from the multi-layer glass irradiated with laser light having a wavelength of 10.6 μm, and thermal cracking occurred on the glass surface.
A burn paper with an irradiation mark with an energy density of 5 mJ / cm ² or more is laid under the glass, and laser light having a wavelength of 10.6 μm is irradiated through the glass at an energy density of 120 J / cm ^2. It was confirmed that a laser with a wavelength of 10.6 μm did not transmit even 5 mJ / cm ² even when irradiated with an energy density of 120 J / cm ² without leaving irradiation marks.

"Example 2"
Transmittance of laser light with wavelengths of 532 nm and 1064 nm of float glass (thickness: 3 mm), heat ray absorbing glass (green) (thickness: 5 mm), and Low-E glass (thickness: 5 mm) is measured with a power meter (FL250A -BB-35, Offiel Japan Co., Ltd.). The transmittance was calculated from the measured value based on the presence or absence of glass by irradiating a power meter with a laser whose output was fixed at 1 W.
The results are shown in Table 1.

The laser light with a wavelength of 532 nm showed a high transmittance of 90% or more in any glass.
On the other hand, the laser beam having a wavelength of 1064 nm has a small transmittance of 40% or less between the heat ray absorbing glass and the Low-E glass.

"Example 3"
A laser beam having a wavelength of 1064 nm was used as the first laser beam, and the sealing material was irradiated from a direction perpendicular to the surface of the multilayer glass. The multilayer glass used in the experiment is type A, in which the glass plate is float glass, the primary sealing material is butyl rubber, and the secondary sealing material is polysulfide. Irradiation ^{conditions, 74J / cm 2 ~1.7kJ / cm} 2 energy density in the double-glazing surfaces per shot laser (peak power density ^{368kW / cm 2 ~1.7MW / cm 2} ) was varied from ceiling The material was irradiated with only one row in a dot shape, and the state of the sealing material at the time of irradiation was visually observed.
As a result of the experiment, it was confirmed that when laser light with an energy density of 74 J / cm ^{2 to} 840 J / cm ² was irradiated, soot and decomposition gas increased as the energy density increased. It was confirmed that when a laser beam having an energy density of 1.7 kJ / cm ² was irradiated, the gas generated after several irradiations ignited.
From this, it was confirmed that the laser beam is preferably 840 J / cm ² or less in order to prevent ignition and explosion.

Example 4
The glass plate was peeled by irradiating the sealing material of the multilayer glass from the direction perpendicular to the surface of the various multilayer glasses using laser beams having wavelengths of 1064 nm and 532 nm as the first laser light.
The multi-layer glass used in the experiment is a sample of 10 cm square, the primary sealing material is butyl rubber, the secondary sealing material is polysulfide type A, the primary sealing material is butyl rubber, and the secondary sealing material is type B of silicone. .

The 1064 nm laser beam has an energy density of 3.7 to 9.3 J / cm ² , a pulse width of 0.5 ms to 1.1 ms, a frequency of 10 Hz, an irradiation interval of 3 mm, a scanning speed of 30 mm / s, and an irradiation shape d1 = 6.5 mm. Irradiation was performed while scanning only in one axial direction parallel to the length direction of the spacer, in an elliptical shape of d2 = 23.5 mm. When the energy density is 12.7 J / cm ² or more, the laser output exceeds the durability of the lens, so the pulse width is 0.6 to 0.7 ms, the frequency is 10 Hz, the irradiation interval is 3 mm, the scanning speed is 30 mm / s, and the irradiation shape diameter is 7. After irradiating one row in the length direction of the spacer in a circular shape of 5 mm, the entire surface was irradiated with a shift of 5 mm in the width direction of the spacer.
The laser beam of 532 nm is a circle having an energy density of 1 to 17 J / cm ² , a pulse width of 10 ns, a frequency of 20 kHz, an irradiation interval of 50 μm, and an irradiation shape diameter of 39 μm. The entire surface was irradiated with a shift of 50 μm in the vertical direction.

  The results of the experiment are shown as ◯ for those that could be easily peeled after laser irradiation, △ for those that required force but easily peeled compared to untreated, and × for those that could not be peeled. 2 and 3.

It was confirmed that the glass plate can be easily peeled off as the energy density of the laser light on the surface of the double-glazed glass increases. The laser beam of 532 nm was able to peel off the glass plate at an energy density higher than 4 J / cm ² and the laser beam of 1064 nm was larger than 15.0 J / cm ² . It is an influence.
From the multilayer glass, the glass plate could be peeled off without adhering aluminum or zeolite. The weight of the glass plate in the peeled state is measured, the weight of the glass plate after removing the residual organic matter is measured, and the amount of residual organic matter calculated from this weight difference is a laser with a wavelength of 1064 nm in terms of 1 m square glass. It was 236 ppm or less at the time of light irradiation, and 200 ppm or less at the time of laser light irradiation with a wavelength of 532 nm. In addition, the peeled glass has soot mainly generated by heating the sealing material as organic matter, sealing remaining on the adhesive part, and secondary sealing material adhering to the side surface of the glass plate. It was a secondary sealing material adhering to the side.

"Example 5"
In the same manner as in Example 4 above, the length of the spacer on the double-glazed glass (type A, float glass) at an energy density of 5.7 J / cm ² on the double-glazed glass surface using the laser light having a wavelength of 1064 nm as the first laser light. Irradiation was performed while scanning only in one axial direction parallel to the vertical direction (n = 10).
Further, in addition to the first laser beam, a laser beam having a wavelength of 1064 nm is used as the second laser beam, and the energy density on the surface of the multilayer glass is 9.7 J / cm ² (energy density on the side surface of the glass plate is 2.8 J / cm ^2). ), Pulse width 0.5 ms, frequency 10 Hz, irradiation interval 3 mm, scanning speed 30 mm / s, circular shape with irradiation shape diameter 7.5 mm (shape in cross section perpendicular to optical axis), irradiation angle 60 ° from vertical direction, Irradiation was performed while scanning only in one axial direction parallel to the length direction of the spacer (n = 10). The second laser beam has an elliptical irradiation area on the side surface of the glass plate due to oblique incidence and refraction at the interface.

The glass plate was peeled after laser light irradiation, the amount of organic matter on the glass plate in the peeled state was measured, and the amount of converted organic matter (converted) converted to 1 m square glass was calculated. The results are shown in Table 4.

  It was confirmed that the amount of organic substances was greatly reduced by irradiating the second laser beam in addition to the first laser beam. The amount of the organic substance is a value when the glass plate peeled after the laser light irradiation is measured as it is. Therefore, it was suggested that the amount of organic substances can be reduced to 20 ppm or less by wiping around the peeled glass plate and removing the remaining sealing material. In addition, some samples irradiated with the second laser beam can be peeled off simply by lifting the glass plate. By irradiating the side surface of the glass plate with the second laser beam, the glass plate is peeled off. It became easy and it was confirmed that workability was improved.

DESCRIPTION OF SYMBOLS 1 Multilayer glass peeling apparatus 11 Laser oscillator 12 Beam splitter 13 First optical system 131 Convex lens 132 Cylindrical lens 14 Second optical system 141 Convex lens 142 Cylindrical lens 143 Mirror

L0 Laser light L1 First laser light L2 Second laser light

2 Multi-layer glass 21a First glass plate 21b Second glass plate 22 Spacer 23 Sealing material 231 Primary sealing material 232 Secondary sealing material

Claims (9)

A laser oscillator and a first optical system comprising at least one lens;
The first optical system irradiates the sealing material on the inner surface of the multilayer glass with the first laser light emitted from the laser oscillator,
The multi-layer glass peeling apparatus, wherein the first laser beam is irradiated while scanning only in a uniaxial direction parallel to a length direction of the multi-layer glass spacer.   2. The multilayer glass peeling apparatus according to claim 1, wherein an oscillation wavelength of the laser oscillator is 330 nm or more and 2800 nm or less. Double glazing peeling apparatus according to claim 1 or 2, wherein the energy density in the double-glazing surfaces of the first laser light is 4J / cm ² or more 840J / cm ² or less.   When the width in the direction parallel to the length direction of the spacer is d1 and the width in the direction parallel to the width direction of the spacer is d1 in the irradiation region of the first laser beam on the surface of the multilayer glass, d1 <D2 is the multilayer glass peeling apparatus according to any one of claims 1 to 3.   The multilayer glass peeling apparatus according to any one of claims 1 to 4, wherein the center of the irradiation region of the first laser beam is located on the primary sealing material. Having a second optical system,
The said 2nd optical system irradiates the side surface of the glass plate which comprises the said multilayer glass from the center side of the said multilayer glass with the 2nd laser beam. The multilayer glass peeling apparatus as described in any one of.   The multi-layer glass peeling apparatus according to any one of claims 1 to 6, wherein an irradiation region by the first optical system and an irradiation region by the second optical system do not overlap. Irradiate the first laser beam to the sealing material of the multilayer glass from a direction perpendicular to the plane of the multilayer glass,
The first laser beam is irradiated while scanning only in a uniaxial direction parallel to the length direction of the spacer of the multilayer glass, thereby reducing the adhesive force of the sealing material. A method for peeling a glass plate from glass.   The glass plate peeling method according to claim 8, wherein the second laser beam is applied to the side surface of the multilayer glass from the center side of the multilayer glass.

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