JP2014000513A - Glass panel separation method and heat treatment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glass panel separation method capable of removing a joint material and separating a sheet body from a glass plate in a glass panel such as a PV panel or a laminated glass panel.SOLUTION: To separate a solar battery cell unit 2, tabs 3, a glass plate 4, and a back sheet 5 included in a silicon-based PV panel 1, it is necessary to remove EVA 6 that bonds together the solar battery cell unit 2, the tabs 3, the glass plate 4, and the back sheet 5. To remove the EVA 6, the silicon-based PV panel 1 is introduced into a tunnel kiln 10 and heated in the tunnel kiln 10. If a temperature of the silicon-based PV panel 1 is rapidly increased, then the EVA 6 remains and it is impossible to separate the solar battery cell unit 2 from the glass plate 4. Furthermore, the glass plate 4 is damaged due to a rapid temperature change. Therefore, the temperature of the silicon-based PV panel 1 is gradually increased up to a set maximum temperature, and gradually decreased after reaching the maximum temperature.

Description

  The present invention relates to a method for separating a sheet body constituting a glass panel and a glass plate bonded to one surface thereof, and a heat treatment apparatus used therefor.

  In recent years, interest in environmental problems and resource problems has increased, and attention has been focused on power generation using natural energy such as solar power generation. Moreover, the price of photovoltaic power generation panels (PV panels) has gradually decreased, and the penetration rate of photovoltaic power generation to the public and general households has increased.

  The lifetime of the PV panel is about 15 to 20 years. Photovoltaic power generation started to spread about 20 years ago, and PV panels introduced at the beginning of the solar power generation have reached the end of their life and are starting to be discarded. In addition, high production technology is required for the production of PV panels, and the disposal rate due to initial failure is still high. Therefore, it is expected that the number of PV panels discarded in the future will continue to increase year by year, and the demand for recycling PV panels is increasing.

  PV panels include silicon cells, glass plates and backsheets. The glass plate, the silicon cell, and the back sheet have a thin plate shape. For example, after a glass plate and a back sheet are arranged to face each other through an ethylene vinyl acetate copolymer (EVA) used as a bonding material on one side and the other side of a silicon cell, those structures are heated. However, pressure is applied between the glass plate and the backsheet. As a result, EVA is crosslinked and cured, and the silicon cell, the glass plate, and the back sheet are bonded to each other by the EVA.

Japanese Patent Laid-Open No. 6-177412

  In order to recycle the PV panel, it is necessary to remove EVA and separate each member.

  However, in the prior art, EVA cannot be removed without damaging the silicon cells, tabs, and glass plates, so PV panel recycling has not been realized at present.

  Further, in the conventional technology, not only the PV panel but also a laminated glass panel in which a glass plate and a glass plate are bonded using a bonding material (PVB), the bonding material is removed without damaging the glass plate. It is not possible.

  An object of the present invention is to provide a glass panel separation method capable of removing a bonding material and separating a sheet body and a glass plate in a glass panel such as a PV panel or a laminated glass panel.

  In order to achieve the above object, a method for separating a glass panel according to one aspect of the present invention is a method for separating a sheet body constituting a glass panel and a glass plate joined to one surface thereof via a joining material. It is. The separation method includes an introduction step of introducing the glass panel into a heat treatment apparatus, and a separation step of heating the glass panel in the heat treatment apparatus to separate the sheet body and the glass plate from each other, In the separation step, the temperature of the atmosphere around the glass panel is gradually increased to the maximum temperature set according to the material of the bonding material, and then the temperature of the atmosphere is gradually decreased from the maximum temperature.

  In order to separate the sheet body and the glass plate, it is necessary to remove the bonding material that joins the sheet body and the glass plate.

  When the temperature of the glass panel is rapidly increased, the joining material reaches the ignition temperature before the joining material is completely gasified. In this case, since the bonding material that has not been gasified remains on the bonding surface, the sheet body and the glass plate cannot be completely separated from the glass panel. Further, the glass plate is damaged by a sudden temperature change. For this reason, the temperature of the atmosphere around the glass panel is gradually increased to the maximum temperature set according to the material of the bonding material, and is gradually decreased after reaching the maximum temperature.

  Thereby, a joining material can be removed, without damaging a glass plate. By removing the bonding material, the sheet body and the glass plate can be separated. As a result, the sheet body and the glass plate can be obtained in a recyclable form.

  The glass panel may be a photovoltaic power generation panel. In this case, the sheet body is a solar battery cell, and the glass plate is bonded to the surface of the solar battery cell via a bonding material.

  In the separation step, the solar battery cell and the glass plate are separated. As a result, the glass plate and the solar battery cell can be obtained in a recyclable form.

  The photovoltaic power generation panel may include wiring connected to the surface of the solar battery cell and a back sheet bonded to the back surface of the solar battery cell via a bonding material.

  In this case, in the separation step, the solar battery cell, the glass plate, and the wiring can be separated so as to be recyclable. The backsheet usually burns out during heating.

  If the maximum temperature is set lower than the ignition temperature of the bonding material, the bonding material is not completely removed. Further, when the maximum temperature is set to the melting temperature of the glass plate, the glass plate is melted, so that the glass plate and the sheet body cannot be recycled. The maximum temperature is preferably set in a range higher than the ignition temperature of the bonding material and lower than the melting temperature of the glass plate.

  Thereby, a joining material can be removed favorably, without melting a glass plate.

  The heat treatment apparatus may include a plurality of chambers that form one panel conveyance path. In this case, the temperature in the chamber arranged at the center of the panel conveyance path is controlled to the highest temperature, and the chamber closer to the inlet and outlet of the panel conveyance path from the chamber controlled to the highest temperature has a lower temperature in the chamber. It is good to be controlled so that it becomes. And in a separation process, it is good for a glass panel to be sequentially conveyed in each chamber.

  The heat treatment apparatus may include one chamber. In this case, the chamber temperature may be controlled to be gradually increased to the maximum temperature, gradually decreased after being heated to the maximum temperature. In the separation step, the glass panel is preferably heated while being stationary in the chamber.

  In the introducing step, the glass panel is preferably installed in the cage with the glass plate oriented vertically downward.

  Thereby, since a sheet | seat body remains on a glass plate after a isolation | separation process, a glass plate and a sheet | seat body can be collect | recovered easily.

  The heat processing apparatus which concerns on the other situation of this invention is a heat processing apparatus used in order to isolate | separate the sheet | seat body which comprises a glass panel, and the glass plate joined to the one side through the joining material. The heat treatment apparatus includes a chamber for heating the glass panel, introduction means for introducing the glass panel into the chamber, and the temperature of the atmosphere around the glass panel with the elapsed time after the glass panel is introduced into the chamber. Temperature control means for gradually raising the temperature to the maximum temperature set according to the material of the bonding material and then gradually lowering the temperature of the atmosphere around the glass panel from the maximum temperature.

  The separation method can be carried out using this heat treatment apparatus. As a result, the bonding material can be removed and the sheet body and the glass plate can be separated.

  ADVANTAGE OF THE INVENTION According to this invention, the joining material currently used for the glass panel can be removed favorably, and a sheet body and a glass plate can be isolate | separated in the form which can be recycled.

FIG. 1 is an exploded perspective view of a silicon-based PV panel according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of a solar battery cell. FIG. 3 is a block diagram showing a main configuration of the tunnel kiln. FIG. 4 is a block diagram showing a main configuration of the shuttle kiln.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is an exploded perspective view of a silicon-based PV panel according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of a solar battery cell.

  The silicon-based PV panel 1 includes a solar cell unit 2, a tab 3, a glass plate 4, a back sheet 5, and EVA 6.

  Solar cell unit 2 includes a plurality of solar cells 50. Each solar cell 50 includes polycrystalline silicon 7 as a substrate. The surface of the polycrystalline silicon 7 is covered with an interlayer insulating film 8 made of, for example, PSG (phosphosilicate glass). Two electrodes 9 are formed on the surface of the polycrystalline silicon 7. The electrode 9 is made of, for example, Ag (silver). An opening is formed in the interlayer insulating film 8 at a position facing each electrode 9, and the electrode 9 protrudes in a raised shape on the interlayer insulating film 8 through the opening.

  The plurality of solar cells 50 are arranged in a square matrix. The photovoltaic cells 50 aligned in the row direction are electrically connected in series by laying wiring 51 between the electrodes 9 of each photovoltaic cell 50, forming a series connection structure. Each series connection structure is electrically connected in parallel.

  For example, two tabs 3 are provided. The tab 3 has an elongated thin plate shape made of metal. The tabs 3 are arranged so as to be parallel to each other. One end of each tab 3 is electrically connected to the wiring 51. The other end of the tab 3 protrudes outside the solar cell unit 2 in plan view.

  The glass plate 4 is formed in the same shape and substantially the same size as the solar cell unit 2 in plan view. The glass plate 4 is disposed to face the solar battery cell unit 2. Thereby, the tab 3 is sandwiched between the solar cell unit 2 and the glass plate 4. By covering the solar battery cell unit 2 with the glass plate 4, the silicon-based PV panel 1 can withstand long-term outdoor use while ensuring translucency.

  The back sheet 5 is formed in the same shape and substantially the same size as the solar cell unit 2 in plan view. The back sheet 5 is disposed to face the surface of the solar battery unit 2 that does not face the glass plate 4.

  EVA6 is arrange | positioned so that the clearance gap between the photovoltaic cell unit 2, the glass plate 4, and the backsheet 5 may be satisfy | filled.

  When the silicon-based PV panel 1 is manufactured, for example, two sheet-like EVAs 6 are respectively disposed between the solar battery cell unit 2, the glass plate 4, and the back sheet 5. Thereafter, the solar cell unit 2, the tab 3, the glass plate 4, the back sheet 5 and the EVA 6 are heated, and the glass plate 4 and the back sheet 5 are pressurized in the facing direction. Thereby, EVA6 is bridge | crosslinked and hardened | cured and the photovoltaic cell unit 2, the glass plate 4, and the backsheet 5 are joined by EVA6. Further, EVA 6 enters between the solar cells 50, and each solar cell 50 is sealed with EVA 6 between the glass plate 4 and the back sheet 5.

  FIG. 3 is a block diagram showing a main configuration of the tunnel kiln 10.

  The tunnel kiln 10 is a heat treatment apparatus for heating the silicon-based PV panel 1 and removing the EVA 6.

  In the tunnel kiln 10, a panel transport path 11 for transporting the silicon-based PV panel 1 is formed. The panel conveyance path 11 extends linearly.

  A first chamber 21, a second chamber 22, a third chamber 23, a fourth chamber 24, a fifth chamber 25, a sixth chamber 26, a seventh chamber 27, and an eighth chamber 28 are arranged in parallel on the panel conveyance path 11. Has been. The silicon-based PV panel 1 transported through the panel transport path 11 passes through the first chamber 21 to the eighth chamber 28 in this order.

  The temperature sensor 13 is provided in the first chamber 21 to the eighth chamber 28. The temperature sensors 13 detect the temperatures in the first chamber 21 to the eighth chamber 28 (chamber temperature), respectively.

  The tunnel kiln 10 is provided with a control unit 14. The heater 12 is connected to the control unit 14 as a control target. Further, a temperature sensor 13 is connected to the control unit 14.

  A target temperature is set for each of the first chamber 21 to the eighth chamber 28. The control unit 14 compares the temperature in the chamber detected by the temperature sensor 13 with the target temperature, and controls the heater 12 so that the temperature in the chamber matches the target temperature.

  The target temperature of the fourth chamber 24 or the fifth chamber 25 farthest from the entrance / exit is set to a maximum temperature (a temperature higher than 450 ° C.).

  When the target temperature of the fourth chamber 24 is set to the maximum temperature, the target temperatures of the first chamber 21, the second chamber 22, and the third chamber 23 are set to increase in this order. The target temperatures of the fifth chamber 25, the sixth chamber 26, the seventh chamber 27, and the eighth chamber 28 are set so as to decrease in this order.

  When the target temperature of the fifth chamber 25 is set to the maximum temperature, the target temperatures of the first chamber 21, the second chamber 22, the third chamber 23, and the fourth chamber 24 are set to increase in this order. The target temperatures of the sixth chamber 26, the seventh chamber 27, and the eighth chamber 28 are set so as to decrease in this order.

  Specifically, the target temperature of the first chamber 21 is set in a range of about 170 ° C. to about 200 ° C. The target temperature of the second chamber 22 is set in the range of about 220 ° C. to about 260 ° C. The target temperature of the third chamber 23 is set in the range of about 340 ° C. to about 370 ° C. The target temperature of the fourth chamber 24 is set in the range of about 450 ° C. to about 460 ° C. The target temperature of the fifth chamber 25 is set in the range of about 450 ° C. to about 480 ° C. Further, the target temperature of the sixth chamber 26 is set in a range of about 300 ° C. to about 350 ° C. The target temperature of the seventh chamber 27 is set to about 250 ° C. The target temperature of the eighth chamber 28 is set to about 150 ° C.

  The tunnel kiln 10 is provided with a cage 15. The cage 15 is used for the silicon-based PV panel 1 to move on the panel conveyance path 11.

  The silicon-based PV panel 1 is mounted on the cage 15 with the glass plate 4 oriented vertically downward. After the silicon PV panel 1 is mounted on the cage 15, the silicon PV panel 1 is introduced into the tunnel kiln 10 and moved from the first chamber 21 to the eighth chamber 28 on the panel conveyance path 11.

  When the target temperature of the fourth chamber 24 is set to the maximum temperature, the temperature of the silicon PV panel 1 gradually increases while the silicon PV panel 1 moves from the first chamber 21 to the fourth chamber 24. . Thereafter, while the silicon-based PV panel 1 moves from the fourth chamber 24 to the eighth chamber, the temperature of the silicon-based PV panel 1 gradually decreases.

  When the target temperature of the fifth chamber 25 is set to the maximum temperature, the temperature of the silicon-based PV panel 1 gradually increases while the silicon-based PV panel 1 moves from the first chamber 21 to the fifth chamber 25. . Thereafter, while the silicon-based PV panel 1 moves from the fifth chamber 25 to the eighth chamber, the temperature of the silicon-based PV panel 1 gradually decreases.

  Thereby, EVA6 is removed and the photovoltaic cell unit 2, the tab 3, the glass plate 4, and the backsheet 5 can be isolate | separated.

  As described above, in order to separate the solar cell unit 2, the tab 3, the glass plate 4 and the back sheet 5 included in the silicon-based PV panel 1, the solar cell unit 2, the glass plate 4 and the back sheet 5 are separated. It is necessary to remove the adhered EVA 6.

  In order to remove the EVA 6, the silicon-based PV panel 1 is introduced into the tunnel kiln 10 and heated.

  When the temperature of the silicon-based PV panel 1 is rapidly increased, the EVA 6 reaches the ignition temperature before the EVA 6 is completely gasified. In this case, since the EVA 6 that has not been gasified remains on the joint surface, the solar cell unit 2 and the glass plate 4 cannot be completely separated. Moreover, the glass plate 4 is damaged by a rapid temperature change. For this reason, the temperature of the silicon-based PV panel 1 is gradually increased to the maximum temperature set according to the material of the EVA 6, and is gradually decreased after reaching the maximum temperature.

  Thereby, EVA6 can be removed, without damaging the glass plate 4. FIG. By removing EVA 6, solar cell unit 2, glass plate 4 and backsheet 5 can be separated. The backsheet 5 is usually burned off during heating. As a result, the solar cell unit 2, the tab 3, and the glass plate 4 can be obtained in a form that can be recycled.

  If the maximum temperature is set lower than the ignition temperature of EVA6, EVA6 is not completely removed. If the maximum temperature is set to the melting temperature of the glass plate 4, the glass plate 4 melts, so that the solar cell unit 2, the glass plate 4, and the back sheet 5 cannot be recycled. The maximum temperature is set in a range higher than the ignition temperature of EVA 6 and lower than the melting temperature of glass plate 4.

  Thereby, EVA6 can be removed favorably, without making the glass plate 4 fuse | melt.

  The tunnel kiln 10 includes a first chamber 21 to an eighth chamber 28 arranged side by side on a panel conveyance path 11 extending in a straight line. In this case, the temperature of the fourth chamber 24 or the fifth chamber 25 is controlled to the maximum temperature, and the temperatures of the first chamber 21, the second chamber 22, and the third chamber 23 are controlled to increase in this order, and the sixth chamber 26, the temperature of the seventh chamber 27 and the eighth chamber 28 is controlled to decrease in this order. In the separation step, the silicon-based PV panel 1 is transported through the first chamber 21 to the eighth chamber 28 in this order.

  The silicon-based PV panel 1 is housed in the cage 15 with the glass plate 4 facing vertically downward.

  Thereby, since the photovoltaic cell unit 2 and the tab 3 remain on the glass plate 4 after the separation step, the glass plate 4, the photovoltaic cell unit 2 and the tab 3 can be easily recovered.

  As mentioned above, although one Embodiment of this invention was described, this invention can also be implemented with another form.

  For example, a mesh belt kiln may be used as the heat treatment apparatus. The mesh belt kiln has substantially the same configuration as the tunnel kiln 10 except that it includes a conveyor belt instead of the cage 15. The silicon-based PV panel 1 is mounted on a conveyor belt and conveyed through each chamber sequentially.

  Moreover, although the tunnel kiln 10 is provided with the first chamber 21 to the eighth chamber 28, the tunnel kiln 10 is not limited thereto, and may be provided with three or more chambers. In a configuration including three or more chambers, the temperature of the chamber disposed in the center of the panel conveyance path 11 is controlled to the highest temperature, and the temperature of each chamber is set to the highest temperature from the chamber close to the inlet If it is controlled so as to be gradually raised to the maximum temperature and then gradually lowered from the maximum temperature, the same effect as that of the configuration including the first chamber 21 to the eighth chamber 28 can be obtained.

  Further, for example, a shuttle kiln 30 shown in FIG. 4 may be used as a heat treatment apparatus instead of the tunnel kiln 10.

  The shuttle kiln 30 includes a single chamber 31. The chamber 31 is provided with a heater 32 and a temperature sensor 33.

  The shuttle kiln 30 is provided with a control unit 34. A heater 32 is connected to the control unit 34 as a control target. A temperature sensor 33 is connected to the control unit 34.

  The control unit 34 compares the temperature in the chamber 31 detected by the temperature sensor 33 with the target temperature, and controls the heater 32 so that the temperature in the chamber 31 matches the target temperature.

  The shuttle kiln 30 includes a cage 35. The cage 35 is used for introducing the silicon-based PV panel 1 into the chamber 31.

  The silicon-based PV panel 1 is mounted on the cage 35 with the glass plate 4 oriented vertically downward. After the silicon-based PV panel 1 is mounted on the cage 35, the silicon-based PV panel 1 is introduced into the chamber 31 and heated in a state of being stationary in the chamber 31. The target temperature in the chamber 31 is gradually increased from the room temperature immediately after introduction to the set maximum temperature. Thereafter, the target temperature in the chamber 31 is gradually lowered from the maximum temperature. The maximum target temperature in the chamber 31 is set to a temperature higher than 450 ° C. When the heating of the silicon-based PV panel 1 is finished, the cage 35 is taken out from the chamber 31.

  Thereby, the temperature of the silicon-based PV panel 1 rises as the temperature in the chamber 31 rises after being introduced into the chamber 31, and after the temperature in the chamber 31 reaches the set maximum temperature, The temperature drops as the temperature drops. For this reason, even when the shuttle kiln 30 is used as a heat treatment apparatus, the same effects as when the tunnel kiln 10 is used as a heat treatment apparatus are obtained.

  Also in the shuttle kiln 30, a conveyor belt may be provided instead of the cage 35.

  Moreover, although the polycrystalline silicon 7 was taken up as an example of the photoelectric conversion element used for a solar cell panel, as a photoelectric conversion element, silicon type photoelectric conversion elements other than polycrystalline silicon, a compound type, and an organic type photoelectric conversion element, for example May be used.

  Since the ignition temperature of EVA 6 varies depending on the content of vinyl acetate, it is preferable to set the maximum temperature in tunnel kiln 10 or shuttle kiln 30 accordingly.

  This heat treatment method can also be applied to a laminated glass panel such as a windshield for a vehicle. In the laminated glass panel, a glass plate is laminated on one surface of a glass plate via a bonding material (PVB). In this case, when the heat treatment described in the present embodiment is performed using a heat treatment apparatus in which the maximum temperature corresponding to the ignition temperature of PVB is set, the bonding material is removed and the glass plate included in the windshield can be taken out. it can.

  In addition, various design changes can be made to the above-described configuration within the scope of the matters described in the claims.

  Next, the present invention will be described based on examples and comparative examples, but the present invention is not limited to the following examples.

In Examples 1 to 3 and Comparative Examples 1 to 3 to be described next, using the tunnel kiln having the configuration according to the first embodiment described above, the silicon-based PV panel is moved at a constant speed, and the tunnel kiln first The first chamber, the second chamber, the third chamber, the fourth chamber, the fifth chamber, the sixth chamber, the seventh chamber, and the eighth chamber were passed through in this order. The time required for the silicon-based PV panel to pass through the first to eighth chambers is 12 minutes for each chamber. Further, the target temperatures of the first to eighth chambers in Examples 1 to 3 and Comparative Examples 1 to 3 are as shown in Tables 1 to 6.
<Example 1>

  In Example 1, the target temperatures (in-furnace set temperatures) of the first chamber, the second chamber, the third chamber, the fourth chamber, the fifth chamber, the sixth chamber, the seventh chamber, and the eighth chamber are 170 ° C., It is set to 250 ° C, 350 ° C, 450 ° C, 480 ° C, 350 ° C, 250 ° C, and 150 ° C.

At this time, the solar cell, the glass plate, the back sheet, and the tab were separated from each other in the cage after passing through the tunnel kiln.
<Example 2>

  In Example 2, the target temperature (in-furnace set temperature) of each of the first chamber, the second chamber, the third chamber, the fourth chamber, the fifth chamber, the sixth chamber, the seventh chamber, and the eighth chamber is 200 ° C., 220 ° C, 340 ° C, 460 ° C, 450 ° C, 300 ° C, 250 ° C, and 150 ° C.

At this time, the solar cell, the glass plate, the back sheet, and the tab were separated from each other in the cage after passing through the tunnel kiln. However, EVA was not completely removed from each member.
<Example 3>

  In Example 3, the target temperatures (in-furnace set temperatures) of the first chamber, the second chamber, the third chamber, the fourth chamber, the fifth chamber, the sixth chamber, the seventh chamber, and the eighth chamber are 200 ° C., 260 ° C, 370 ° C, 460 ° C, 470 ° C, 320 ° C, 250 ° C, and 150 ° C.

At this time, the solar cell, the glass plate, the back sheet, and the tab were separated from each other in the cage after passing through the tunnel kiln. However, EVA was not completely removed from each member.
<Comparative Example 1>

  In Comparative Example 1, the target temperatures (in-furnace set temperatures) of the first chamber, the second chamber, the third chamber, the fourth chamber, the fifth chamber, the sixth chamber, the seventh chamber, and the eighth chamber are 170 ° C., It is set to 250 ° C., 350 ° C., 450 ° C., 450 ° C., 350 ° C., 250 ° C., and 150 ° C.

At this time, in the cage after passing through the tunnel kiln, the solar cell, the glass plate, the back sheet, and the tab may be separated from each other or may not be separated from each other.
<Comparative example 2>

  In Comparative Example 2, the target temperatures (in-furnace set temperatures) of the first chamber, the second chamber, the third chamber, the fourth chamber, the fifth chamber, the sixth chamber, the seventh chamber, and the eighth chamber are 190 ° C., 220 ° C., 340 ° C., 400 ° C., 360 ° C., 300 ° C., 250 ° C., and 150 ° C.

At this time, in the cage after passing through the tunnel kiln, the solar cells, the glass plate, the back sheet, and the tab were not separated from each other, and EVA was not completely removed.
<Comparative Example 3>

  In Comparative Example 3, the target temperatures (in-furnace set temperatures) of the first chamber, the second chamber, the third chamber, the fourth chamber, the fifth chamber, the sixth chamber, the seventh chamber, and the eighth chamber are 170 ° C., It is set to 250 ° C., 350 ° C., 400 ° C., 350 ° C., 300 ° C., 250 ° C., and 150 ° C.

  At this time, in the cage after passing through the tunnel kiln, the solar cells, the glass plate, the back sheet, and the tab were not separated from each other, and EVA was not completely removed.

  In the temperature conditions of Examples 1 to 3, the solar battery cell, the glass plate, the back sheet, and the tab were separated from each other in the cage after passing through the tunnel kiln. However, in the temperature conditions of Comparative Examples 1 to 3, the solar battery cell, the glass plate, the back sheet, and the tab were not separated from each other in the cage after passing through the tunnel kiln.

  From this result, the target temperature of the first chamber is set in the range of about 170 ° C. to about 200 ° C. The target temperature of the second chamber is set in the range of about 220 ° C. to about 260 ° C., the target temperature of the third chamber is set in the range of about 340 ° C. to about 370 ° C., and the target temperature of the fourth chamber is The target temperature of the fifth chamber is set to be higher than the ignition temperature of EVA, that is, higher than about 450 ° C., preferably in the range of about 450 ° C. to about 480 ° C. The target temperature of the six chamber is set in the range of about 300 ° C. to about 350 ° C., the target temperature of the seventh chamber is set to about 250 ° C., and the target temperature of the eighth chamber is set to about 150 ° C. I know it ’s good.

1 Silicon PV panels (glass panels, photovoltaic panels)
2 Solar cell unit (sheet, solar cell)
3 Tab (wiring)
4 Glass plate 5 Back sheet 6 EVA (bonding material)
10 Tunnel kiln (heat treatment equipment)
21 First chamber (chamber)
22 Second chamber (chamber)
23 Third chamber (chamber)
24 Fourth chamber (chamber)
25 Fifth chamber (chamber)
26 Sixth chamber (chamber)
27 Seventh chamber (chamber)
28 Eighth chamber (chamber)
30 Shuttle kiln (heat treatment equipment)
31 Chamber 51 Wiring

Claims (8)

A method of separating a sheet body constituting a glass panel and a glass plate bonded to one surface of the sheet body through a bonding material,
An introducing step of introducing the glass panel into a heat treatment apparatus;
A separation step of heating the glass panel in the heat treatment apparatus to separate the sheet body and the glass plate from each other;
In the separation step, the temperature of the atmosphere around the glass panel is gradually increased to the maximum temperature set according to the material of the bonding material, and then the temperature of the atmosphere is gradually decreased from the maximum temperature. Panel separation method. The glass panel is a photovoltaic power generation panel,
The sheet body is a solar battery cell,
The glass plate is bonded to the surface of the solar battery cell via the bonding material,
The method for separating a glass panel according to claim 1, wherein in the separation step, the solar battery cell and the glass plate are separated. The solar power generation panel includes wiring connected to the surface of the solar battery cell, and a back sheet bonded to the back surface of the solar battery cell via a bonding material,
The glass panel separation method according to claim 2, wherein in the separation step, the solar battery cell, the glass plate, the back sheet, and the wiring are separated from each other.   The said highest temperature is the isolation | separation method of the glass panel as described in any one of Claims 1-3 set in the range higher than the ignition temperature of the said bonding | jointing material, and lower than the melting temperature of the said glass plate. The heat treatment apparatus includes a plurality of chambers that form one panel conveyance path,
In the separation step, the temperature in the chamber arranged at the center of the panel conveyance path is controlled to the maximum temperature, and the chambers closer to the inlet and the outlet of the panel conveyance path from the chamber are located in the chamber. The temperature is controlled to be low, the glass panel is transported through the panel transport path, and the glass panel sequentially passes through the plurality of chambers. Separation method of glass panel. The heat treatment apparatus includes one chamber,
In the separation step, the temperature in the chamber is gradually increased to the maximum temperature while the glass panel is stationary in the chamber, and then the temperature in the chamber is gradually decreased from the maximum temperature. The separation method of the glass panel as described in any one of Claims 1-4.   The method for separating a glass panel according to any one of claims 1 to 6, wherein, in the introducing step, the glass panel is introduced into the heat treatment apparatus in a posture in which the glass plate is directed vertically downward. A heat treatment apparatus used to separate a sheet body constituting a glass panel and a glass plate joined to one surface thereof via a joining material,
A chamber for heating the glass panel;
Introducing means for introducing the glass panel into the chamber;
With the elapsed time after the glass panel is introduced into the chamber, the temperature of the atmosphere around the glass panel is gradually increased to the maximum temperature set according to the material of the bonding material, and then And a temperature control means for gradually lowering the temperature of the atmosphere from the maximum temperature.

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