Method and device for producing glass plate

Abstract

Provided is a method for producing a glass plate that includes a removal step for removing a glass plate 2 from a glass plate package 6 in which a glass plate laminate 4 including a glass plate 2 and a resin sheet 3 is loaded on a pallet 5. The absolute humidity of the removal space S for executing the removal step is adjusted to from 10 g / m3 to 50 g / m3.

Description

Glass plate manufacturing method and manufacturing device

[0001] The present invention relates to a method and an apparatus for producing a glass sheet.

[0002] In the manufacturing process of glass plates, glass plates (glass raw plates) are stored or transported in the form of glass plate packages. The glass plate packages are glass plate laminates each including a glass plate and a protective sheet, which are loaded on a pallet. As the protective sheet, a resin sheet may be used instead of an interleaf paper.

[0003] When a post-process such as trimming is to be performed on the glass plates after storage or transportation of the glass plate package has been completed, a removal process is performed in which the glass plates are removed one by one from the glass plate package before the post-processing (see, for example, Patent Document 1).

[0004] Japanese Patent Application Laid-Open No. 2018-20915

[0005] When a resin sheet is used as the protective sheet, the glass plate to be removed and the resin sheet that is not the target of removal may adhere to each other during the removal process, making it difficult to properly separate them, resulting in removal failure. Such removal failure may cause damage to the glass plate to be removed or wrinkles to form in the resin sheet that is not the target of removal.

[0006] An object of the present invention is to suppress the occurrence of removal defects in the glass sheet removal process.

[0007] As a result of extensive research, the present inventors have discovered that the cause of glass sheet removal failure during the removal process is the absolute humidity of the removal space in which the removal process is carried out. Specifically, if the absolute humidity of the removal space becomes too low, peeling electrification may occur between the glass sheet and the resin sheet when the glass sheet is removed. When peeling electrification occurs, static electricity causes the glass sheet and the resin sheet to adhere to each other, making it difficult to properly separate them, which is likely to lead to removal failure. Therefore, based on this discovery, the present inventors have devised the following invention.

[0008] (1) The present invention, which was invented to solve the above-mentioned problems, is a method for manufacturing a glass plate, which includes an unloading step of unloading a glass plate from a glass plate package in which a glass plate laminate including a glass plate and a resin sheet is loaded on a pallet, and is characterized in that the absolute humidity of an unloading space in which the unloading step is carried out is adjusted.

[0009] This allows the absolute humidity in the removal space to be appropriately adjusted, preventing the absolute humidity in the removal space from becoming too low, thereby suppressing the occurrence of removal problems caused by peeling electrification between the glass plate and the resin sheet.

[0010] (2) In the configuration of (1) above, it is preferable that the removal space is humidified in the removal step.

[0011] This makes it possible to increase the absolute humidity in the removal space, thereby more reliably preventing removal failures.

[0012] (3) In the configuration of (1) or (2) above, in the removal step, the absolute humidity of the removal space is set to 10 g / m ３ It is preferable to adjust it to the above.

[0013] This makes it possible to more appropriately maintain the absolute humidity in the removal space, thereby more reliably preventing removal failures.

[0014] (4) In any of the above configurations (1) to (3), in the removal step, it is preferable that the absolute humidity of the removal space is adjusted by a humidity control device, and that the humidity control device has an absolute humidity measurement function that measures the absolute humidity of the removal space and a humidification function that humidifies the removal space based on the measurement result of the absolute humidity of the removal space.

[0015] In this way, the absolute humidity of the take-out space can be measured and the take-out space can be humidified based on the measured absolute humidity of the take-out space, thereby making it possible to more reliably adjust the absolute humidity of the take-out space.

[0016] (5) In any of the above configurations (1) to (4), it is preferable that the removal space is dehumidified in the removal step.

[0017] If the absolute humidity in the removal space is too high, components of the resin sheet will adhere to the glass plate, and the number of particles adhering to the glass plate will increase. With the above configuration, the absolute humidity in the removal space can be prevented from becoming too high, and an increase in particles adhering to the glass plate can be suppressed.

[0018] (6) In any one of the above (1) to (5), in the removal step, the absolute humidity of the removal space is set to 50 g / m ３ It is preferable to adjust as follows:

[0019] In this way, an increase in particles adhering to the glass plate can be more reliably suppressed.

[0020] (7) In any of the configurations (1) to (6), it is preferable that the absolute humidity of the take-out space is adjusted by a humidity control device, and that the humidity control device has an absolute humidity measurement function that measures the absolute humidity of the take-out space, and a dehumidification function that dehumidifies the take-out space based on the measurement result of the absolute humidity of the take-out space.

[0021] In this way, the absolute humidity of the take-out space can be measured and the take-out space can be dehumidified based on the measured absolute humidity of the take-out space, thereby making it possible to more reliably adjust the absolute humidity of the take-out space.

[0022] (8) The present invention, which has been invented to solve the above-mentioned problems, is a glass plate manufacturing method including a removal step of removing glass plates from a glass plate package in which glass plate laminates each including a glass plate and a resin sheet are loaded on a pallet, wherein the absolute humidity of the removal space in which the removal step is performed is 10 g / m ３ The above features are included in this invention. It should be noted that this invention includes not only cases where the absolute humidity of the removal space is actively adjusted, but also cases where it is not actively adjusted.

[0023] This ensures that the absolute humidity in the removal space is appropriate, thereby more reliably preventing removal failures.

[0024] (9) In the removal process, the absolute humidity of the removal space is 15 g / m ３ It is preferable that this is equal to or greater than this.

[0025] This makes it possible to more appropriately maintain the absolute humidity in the removal space, thereby more reliably preventing removal failures.

[0026] (10) In the configuration of (8) or (9) above, in the removal step, the absolute humidity of the removal space is 50 g / m ３ It is preferable that:

[0027] According to this configuration, an increase in particles on the glass plate can be suppressed.

[0028] (11) In any one of the above (1) to (10), in the removing step, the glass plate and the resin sheet may be removed in a state of being stacked on top of each other.

[0029] In this way, the glass plate can be subjected to subsequent processes with the resin sheet placed underneath, so that the glass plate is less likely to be scratched during the subsequent processes.

[0030] (12) In any of the above configurations (1) to (11), in the removing step, it is preferable that the tact time from removing a glass plate from the glass plate package to removing the next glass plate to be removed is 20 seconds or less.

[0031] Generally, if the peeling speed of the glass sheet is increased in order to shorten the tact time when removing the glass sheet from the glass sheet package, peeling electrification is likely to occur between the glass sheet and the resin sheet. However, according to the present invention, since the absolute humidity of the removal space is appropriate, peeling electrification can be suppressed even when the peeling speed is increased. As a result, the tact time can be reduced to 20 seconds or less, and the manufacturing efficiency of the glass sheet can be improved.

[0032] (13) In any one of the above configurations (1) to (12), the glass sheet package is preferably such that the glass sheet stacks are loaded on a pallet in a vertical position.

[0033] In this way, the adhesion between the glass plates and the resin sheet is weaker than when the glass plate laminate is placed flat on a pallet, and peel electrification is less likely to occur.

[0034] (14) In the configuration of (13) above, in the removing step, it is preferable that the glass plate is removed while being supported by its upper end.

[0035] In this way, it is not necessary to change the orientation of the glass plate, and therefore the glass plate can be removed with a simple configuration.

[0036] (15) In any one of the configurations (1) to (14) above, the surface resistivity of the resin sheet in the removal space is 1×10 ９ Ω / □ (ohms / square) or more 1 x 10 １２ It is preferably Ω / □ (ohms / square) or less.

[0037] If the surface resistivity of the resin sheet in the removal space is too high, removal failure due to peeling electrification is likely to occur. On the other hand, if the surface resistivity of the resin sheet in the removal space is too low, the amount of antistatic agent and surfactant contained in the resin sheet tends to be too high, causing an increase in particles adhering to the glass plate. In contrast, with the above configuration, the surface resistivity of the resin sheet in the removal space is appropriate, thereby suppressing the occurrence of these problems.

[0038] (16) In any of the above (1) to (15), it is preferable that the temperature of the removal space is adjusted to 15° C. or higher and 45° C. or lower in the removal step.

[0039] If the temperature of the removal space is too low, condensation may occur, resulting in an increase in particles adhering to the glass plate. On the other hand, if the temperature of the removal space is too high, the resin sheet may soften and wrinkles may easily form. In contrast, with the above-described configuration, the temperature of the removal space is appropriate, thereby preventing these problems from occurring.

[0040] (17) In any of the above configurations (1) to (16), the resin sheet is preferably a foamed resin sheet.

[0041] This improves the cushioning properties of the resin sheet, making it less likely that the glass plate will be broken.

[0042] (18) The present invention, which has been invented to solve the above-mentioned problems, is a glass plate manufacturing apparatus including a removal device that removes glass plates from a glass plate package in which a glass plate laminate including glass plates and a resin sheet is loaded on a pallet, and is characterized in that the removal device is arranged in a removal space and includes a humidity control device that adjusts the absolute humidity of the removal space.

[0043] In this way, the same effects as those of the corresponding configurations already described can be obtained.

[0044] According to the present invention, it is possible to reduce particles adhering to a glass sheet and suppress the occurrence of removal defects in the glass sheet removal step.

[0045] Fig. 1 is a perspective view showing a glass sheet manufacturing apparatus according to an embodiment of the present invention; Fig. 2 is a side view for explaining a defect that occurs in a removal step; Fig. 3 is a side view for explaining a defect that occurs in a removal step; Fig. 4 is a side view for explaining a defect that occurs in a removal step; Fig. 5 is a side view for explaining a removal step in a glass sheet manufacturing method according to an embodiment of the present invention.

[0046] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In the following description, the direction of the arrow X in the drawings will be referred to as the front side, and the direction of the arrow Y will be referred to as the rear side.

[0047] (Glass Plate Manufacturing Apparatus) As shown in FIG. 1 , the glass plate manufacturing apparatus 1 according to this embodiment includes a take-out device 7 that takes out glass plates 2 from a glass plate package 6 in which glass plate laminates 4 each including a glass plate 2 and a resin sheet 3 are loaded on a pallet 5, and a posture change table 8 that changes the posture of the glass plate 2 taken out by the take-out device 7.

[0048] The glass plate laminate 4 is formed by alternately stacking a plurality of vertically oriented glass plates 2 and vertically oriented resin sheets 3. The pallet 5 includes a back support portion 9 having a back support surface 9a that supports the back surface of the glass plate laminate 4, and a bottom support portion 10 having a bottom support surface 10a that supports the bottom surface of the glass plate laminate 4.

[0049] The spine support surface 9a is an inclined surface that inclines rearward as it moves upward. The inclination angle of the spine support surface 9a with respect to the horizontal plane is, for example, 30° to 85°. Therefore, the glass plate laminate 4 including the glass plates 2 and the resin sheets loaded on the pallet 5 is also inclined in accordance with the spine support surface 9a, although it is in a vertical position.

[0050] The bottom support surface 10a is an inclined surface that slopes upward as it moves toward the front. The inclination angle of the bottom support surface 10a with respect to the horizontal plane is, for example, 5° to 60°. The angle between the back support surface 9a and the bottom support surface 10a is, for example, 80° to 100°.

[0051] The glass plate 2 and the resin sheet 3 are, for example, rectangular (rectangular or square) in shape. The thickness of the glass plate 2 is, for example, 0.01 to 2 mm (preferably 0.2 to 1 mm), and the thickness of the resin sheet 3 is, for example, 0.15 to 2 mm.

[0052] In this embodiment, the resin sheet 3 is a foamed resin sheet, but a non-foamable resin sheet may also be used. Examples of foamed resin sheets that can be used include those made of polyethylene or the like and having a foaming ratio of 5 to 20 times. Resin sheet 3 preferably has elasticity in order to prevent wrinkles from forming. Resin sheet 3 may also contain an antistatic agent such as a polymer-type antistatic agent, or a surfactant such as an anionic surfactant or a nonionic surfactant.

[0053] In the state of the glass plate laminate 4, the upper end of the resin sheet 3 preferably protrudes upward from the upper edge of the glass plate 2. Furthermore, both widthwise end portions of the resin sheet 3 preferably protrude outward in the widthwise direction from both widthwise end portions of the glass plate 2. In this manner, the glass plate 2 can be reliably protected by the resin sheet 3. The protrusion dimension of the upper end portion of the resin sheet 3 is, for example, 40 to 80 mm, and the protrusion dimension of the widthwise end portion of the resin sheet 3 is, for example, 40 to 150 mm. Note that the illustrated example illustrates a case where the glass plate 2 and the resin sheet 3 are the same size.

[0054] Although not shown, the glass sheet package 6 is provided with packaging devices such as cable ties to prevent the glass sheet stack 4 from collapsing. The packaging devices are removed before the removal process is carried out by the removal device 7.

[0055] The take-out device 7 includes a chuck member 11 that sequentially takes out one glass plate 2 and one resin sheet 3 as a set from the pallet 5. The taken-out set of glass plate 2 and resin sheet 3 is transported toward the posture conversion table 8 while being suspended and supported by the chuck member 11. During this transport, the resin sheet 3 is placed in front of the glass plate 2. The glass plate 2 and the resin sheet 3 are transported in a direction perpendicular to the main surface of the glass plate 2. In this case, the glass plate 2 and the resin sheet 3 may be transported by separate chuck members, but in this embodiment, the glass plate 2 and the resin sheet 3 are transported by the same chuck member 11 with the resin sheet 3 overlapping the front side of the glass plate 2.

[0056] The posture conversion table 8 includes a support plate 12 and a receiving plate 13. The posture conversion table 8 does not necessarily have to include the receiving plate 13. In this case, however, it is preferable that the support plate 12 be configured to be able to hold the glass plate 2 and the resin sheet 3 by suction or the like.

[0057] When the glass plate 2 and resin sheet 3 are transported by the chuck member 11 of the take-out device 7 to the installation location of the posture conversion table 8, the posture conversion table 8 is in the state shown by the dotted line in FIG. 1 . In this state, the placement surface 12a of the support plate 12 is inclined, tilting forward as it moves upward. The inclination angle of this placement surface 12a with respect to the horizontal plane is, for example, 60° to 85°. Also, in this state, the receiving surface 13a of the receiving plate 13 is inclined, tilting upward as it moves rearward. The inclination angle of this receiving surface 13a with respect to the horizontal plane is, for example, 5° to 30°. The angle between the placement surface 12a and the receiving surface 13a is, for example, 80° to 100°.

[0058] The conveyed glass plate 2 and resin sheet 3 are placed on the position conversion table 8, which is in the state indicated by the dashed lines. At this point, the front surface 3a of the resin sheet 3 contacts the placement surface 12a of the support plate 12, and the front surface 2a of the glass plate 2 contacts the rear surface 3b of the resin sheet 3. After this, the position conversion table 8 rotates in the direction of arrow a, changing from the state indicated by the dashed lines to the state indicated by the solid lines. As a result, the glass plate 2 and the resin sheet 3 assume a flat-laid position. More specifically, the resin sheet 3 is placed in a flat-laid position on the placement surface 12a of the support plate 12, and the glass plate 2 is placed in a flat-laid position on the resin sheet 3. It is preferable that the rear surface 2b of the glass plate 2 (the surface that is the upper surface in the flat-laid position) be the guaranteed surface, and the front surface 2a of the glass plate 2 (the surface that is the lower surface in the flat-laid position) be the non-guaranteed surface. Here, a guaranteed surface is a surface on which elements and the like are formed, and whose surface properties are guaranteed, whereas a non-guaranteed surface is a surface whose surface properties do not need to be guaranteed to the same extent as a guaranteed surface.

[0059] The glass plate 2 and resin sheet 3 are fed from the position change table 8 in a flat position for subsequent processing such as trimming. The position change table 8 then rotates in the direction of arrow b to return to its original position (the position indicated by the chain line). In this position, the subsequent glass plate 2 and resin sheet 3 that have been removed from the pallet 5 and transported are placed on the position change table 8, and the same operations as those described above are repeatedly performed.

[0060] (Method for Manufacturing Glass Sheet) The method for manufacturing a glass sheet according to this embodiment is carried out using the above-described glass sheet manufacturing apparatus 1. This manufacturing method includes a removal step (see FIG. 1 ) of removing glass sheets 2 from the pallet 5 of the glass sheet package 6, a posture changing step (see FIG. 1 ) of changing the posture of the glass sheets 2 removed in the removal step, and a processing step (not shown) of processing the glass sheets 2 changed from a vertical posture to a flat posture in the posture changing step.

[0061] In the removal step, one glass plate 2 and one resin sheet 3 are sequentially removed as a set from the pallet 5 by the chuck member 11 of the removal device 7 .

[0062] In the posture changing step, the posture of the glass plate 2 and the resin sheet 3 conveyed by the chuck members 11 is changed from a vertical posture to a flat posture using the posture changing table 8 .

[0063] In the processing step, the glass plate 2 is placed in a flat position on the resin sheet 3, and then a predetermined processing such as trimming is performed on the glass plate 2.

[0064] Here, if the absolute humidity of the removal space S where the removal step is carried out is inappropriate, the following problems may occur.

[0065] That is, if the absolute humidity in the removal space S is too low, as shown in FIG. 2 , peeling charge is likely to occur between the glass plate 2 supported by the chuck member 11 and the rear resin sheet 3 when the glass plate 2 and the resin sheet 3 are removed by the chuck member 11 of the removal device 7. When such peeling charge occurs, the glass plate 2 and the rear resin sheet 3 adhere to each other due to static electricity, which may prevent the glass plate 2 from being properly peeled from the rear resin sheet 3. If the glass plate 2 supported by the chuck member 11 is moved toward the posture conversion table 8 in this state of poor peeling, the rear resin sheet 3 in close contact with the glass plate 2 supported by the chuck member 11 may also move, potentially causing wrinkles 3x in the rear resin sheet 3. Unless the rear resin sheet 3 is smoothed out before removal by the chuck member 11, the resin sheet 3 may not be properly placed under the glass plate 2 during a predetermined processing step, resulting in scratches or damage to the glass plate 2.

[0066] 3, when the glass plate 2 supported by the chuck member 11 and the rear resin sheet 3 are in close contact with each other due to peeling charge, if the chuck member 11 moves the glass plate 2 toward the posture conversion table 8, the glass plate 2 supported by the chuck member 11 is pulled by the rear resin sheet 3 and significantly deforms toward the rear. If the glass plate 2 supported by the chuck member 11 is completely peeled off from the rear resin sheet 3 in this state, the glass plate 2 supported by the chuck member 11 may be forcefully ejected forward and collide with the posture conversion table 8, resulting in breakage, as shown in FIG. 4. Breakage of the glass plate 2 supported by the chuck member 11 not only reduces the production efficiency of the glass plate 2 but also generates glass fragments 2x, which increases the number of particles in the removal space S. Even if the glass plate 2 supported by the chuck member 11 does not collide with the posture conversion table 8, the glass plate 2 supported by the chuck member 11 may be broken due to significant shaking after being peeled off from the rear resin sheet 3.

[0067] Furthermore, if charges are accumulated on the glass plate 2 or the resin sheet 3 due to peeling electrification, discharge may occur between the glass plate 2 and the resin sheet 3, possibly causing damage to the glass plate 2.

[0068] On the other hand, if the absolute humidity in the removal space S is too high, dirt containing, for example, antistatic agents, surfactants, calcium, organic matter, etc. derived from the resin sheet 3 may be transferred to the glass plate 2 during the removal process, and the number of particles adhering to the glass plate 2 may increase.

[0069] Therefore, in this embodiment, the absolute humidity of the removal space S is adjusted in the removal step as shown in Fig. 5. In the removal step, it is preferable to adjust the absolute humidity by humidifying and dehumidifying.

[0070] In this embodiment, a humidity control device 14 is disposed in the take-out space S to adjust the absolute humidity of the take-out space S. The humidity control device 14 preferably has a humidifying function, a dehumidifying function, and an absolute humidity measurement function. The humidity control device 14 may be a single device having the humidifying function, the dehumidifying function, and the absolute humidity measurement function. Alternatively, the humidity control device 14 may include a humidifier for humidifying, a dehumidifier (e.g., an air conditioner) for dehumidifying, and an absolute humidity sensor for measuring the absolute humidity, all as separate devices. By humidifying and dehumidifying the take-out space based on the absolute humidity measurement results from the absolute humidity sensor, the absolute humidity of the take-out space can be adjusted more reliably.

[0071] By adjusting the absolute humidity of the removal space S in this manner, the absolute humidity of the removal space S becomes appropriate. Therefore, it is possible to prevent the absolute humidity of the removal space S from becoming too low or too high. As a result, the glass plate 2 supported by the chuck members 11 and the resin sheet 3 behind it do not come into close contact due to peeling electrification, and only the glass plate and resin sheet 3 supported by the chuck members 11 can be smoothly removed from the pallet 5. In addition, adhesion of particles to the glass plate 2 can be suppressed.

[0072] The lower limit of the absolute humidity of the removal space S is 10 g / m ３ It is preferable that the content is 12 g / m or more. ３ More preferably, it is 15 g / m or more. ３ The upper limit of the absolute humidity of the removal space S is 50 g / m or more. ３ Preferably, the weight is 30 g / m or less. ３ More preferably, it is 25 g / m or less. ３ It is more preferable that the absolute humidity of the removal space S is as follows: The absolute humidity of the removal space S can be calculated by measuring the relative humidity and temperature using, for example, ST-50 manufactured by SEKONIC Corporation and converting the results into absolute humidity.

[0073] By adjusting the absolute humidity of the removal space S, the takt time for removing the glass sheet 2 from the pallet 5 in the removal process can be set to 20 seconds or less. In this embodiment, the takt time refers to the time required from removing the glass sheet 2 from the pallet 5 to removing the next glass sheet 2 to be removed. Generally, shortening the takt time makes it easier for peeling charge to occur between the glass sheet 2 and the resin sheet. However, by adjusting the absolute humidity of the removal space S, peeling charge is less likely to occur even if the takt time is shortened. The lower limit of the takt time is preferably 8 seconds or more, and more preferably 10 seconds or more. The upper limit of the takt time is preferably 20 seconds or less, and more preferably 16 seconds or less.

[0074] The lower limit of the surface resistivity of the resin sheet 3 in the removal space S is 1×10 ９ It is preferably Ω / □ or more, and 5×10 ９ More preferably, it is 1×10 １０ The upper limit of the surface resistivity of the resin sheet 3 in the extraction space S is 1×10 １２ It is preferably 5×10 Ω / □ or less, １１ It is more preferable that the resistance is Ω / □ or less, and 1×10 １１ It is even more preferable that the surface resistivity of the resin sheet 3 in the removal space S is Ω / □ or less. If the surface resistivity of the resin sheet 3 in the removal space S is too high, removal defects due to peeling charging are likely to occur. On the other hand, if the surface resistivity of the resin sheet 3 in the removal space S is too low, the amount of antistatic agent and surfactant contained in the resin sheet 3 tends to be too high, which causes an increase in particles adhering to the glass plate 2. Therefore, it is preferable that the surface resistivity of the resin sheet 3 in the removal space S is within the above numerical range.

[0075] Here, the surface resistivity of the resin sheet 3 in the removal space S is measured under conditions in accordance with JIS K6911:1995, except for the pretreatment of the test piece and the relative humidity of the space where the test is performed.

[0076] The lower limit of the temperature of the extraction space S is preferably 15°C or higher, more preferably 18°C ​​or higher, and even more preferably 20°C or higher. The upper limit of the temperature of the extraction space S is preferably 45°C or lower, more preferably 35°C or lower, and even more preferably 25°C or lower. If the temperature of the extraction space S is too low, there is a risk that the number of particles adhering to the glass plate 2 due to condensation will increase. The saturated water vapor amount at 15°C is 12.8 g / m ３ On the other hand, if the temperature of the take-out space S is too high, the resin sheet 3 will soften and wrinkles will be easily formed. Therefore, it is preferable that the temperature of the take-out space S be within the above-mentioned range.

[0077] The humidity control device 14 may have a temperature control function for adjusting the temperature of the removal space S. Furthermore, a temperature control device for adjusting the temperature of the removal space S may be provided as a device separate from the humidity control device 14.

[0078] It is preferable that the temperature of the removal space S is 15°C or higher and the relative humidity of the removal space S is 60% or higher. It is also preferable that the temperature of the removal space S is 45°C or lower and the relative humidity of the removal space S is 90% or lower.

[0079] The present invention is not limited to the configuration of the above-described embodiment, nor is it limited to the above-described effects. The present invention can be modified in various ways without departing from the spirit of the present invention.

[0080] In the above embodiment, the case where the glass sheet laminate is loaded on the pallet in a vertical position has been described, but the glass sheet laminate may also be loaded on the pallet in a flat position. However, in a glass sheet laminate in a vertical position (where the glass sheets and the resin sheet are both in a vertical position), the adhesion between the glass sheets and the resin sheet is weaker than in a glass sheet laminate in a flat position (where the glass sheets and the resin sheet are both in a flat position), so peel electrification is less likely to occur between the glass sheets and the resin sheet. Therefore, from the viewpoint of suppressing removal defects, it is preferable that the glass sheet laminate be in a vertical position.

[0081] In the above embodiment, the humidity control device is disposed in the take-out space. However, if the absolute humidity of the take-out space is 10 g / m ３ 50g / m or more ３ If the humidity is below this, the humidity control device may be omitted.

[0082] In the above embodiment, in the removal step, one glass plate and one resin sheet are sequentially removed as a set from the pallet by the chuck member of the removal device, but this is not limited to this. It is also possible to remove one resin sheet from the pallet and place it on the mounting surface of the support plate of the position change table, and then remove one glass plate from the pallet and place it on the resin sheet. It is also possible to remove one resin sheet from the pallet and discard it, and then remove one glass plate from the pallet and place it on the mounting surface of the support plate of the position change table.

[0083] In the above embodiment, the humidity control device has both a humidifying function and a dehumidifying function, but is not limited to this. It may have only one of the humidifying function and the dehumidifying function. For example, if the absolute humidity of the environmental atmosphere outside the removal space is low, it may have only the humidifying function, and if the absolute humidity of the environmental atmosphere outside the removal space is high, it may have only the dehumidifying function.

[0084] The present invention will be described in detail below based on examples, but the present invention is not limited to these examples.

[0085] First, multiple glass plate packages were prepared by stacking glass plate laminates containing 350 glass plates in a vertical orientation (inclination angle relative to the horizontal plane: 72°) and one vertically oriented resin sheet between each glass plate on a pallet. Next, a removal process was carried out in which glass plates were removed from each glass plate package in removal spaces with different absolute humidities, and the presence or absence of removal defects and the number of particles adhering to the glass plates were evaluated. The absolute humidity of the removal space was measured using a SEKONIC ST-50 and converted to absolute humidity. The presence or absence of removal defects was evaluated as "absent" if all 350 glass plates contained in each package were removed without any removal defects, and "present" if even one glass plate had a removal defect. The particle count was determined by counting particles 0.3 to 5 μm in size using an image inspection device, and the average value was used as the particle count. The results are shown in Table 1.

[0086]

[0087] In Reference Example 1, the absolute humidity of the removal space was 10 g / m ３ Therefore, in Reference Example 1, although the number of particles adhering to the glass plate was small, removal failures that were thought to be caused by peeling electrification occurred. ３ Therefore, in Reference Example 2, although no removal failure occurred, the number of particles adhering to the glass plate was extremely large.

[0088] On the other hand, in both Examples 1 and 2, the absolute humidity of the removal space was 10 g / m ３ 50g / m or more ３ Therefore, in Examples 1 and 2, no removal failure occurred and the number of particles adhering to the glass plate was reduced.

[0089] REFERENCE SIGNS LIST 1 Glass plate manufacturing device 2 Glass plate 3 Resin sheet 4 Glass plate laminate 5 Pallet 6 Glass plate package 7 Removal device 8 Position change table 9 Back support part 10 Bottom support part 11 Chuck member 12 Support plate 13 Receiving plate 14 Humidity control device S Removal space

Claims

1. A method for manufacturing a glass plate, comprising an unloading step of unloading a glass plate from a glass plate package in which a glass plate laminate including a glass plate and a resin sheet is loaded on a pallet, the method comprising the steps of: controlling an absolute humidity of an unloading space in which the unloading step is carried out.

2. The method for manufacturing a glass sheet according to claim 1, wherein the removal space is humidified in the removal step.

3. In the removal step, the absolute humidity of the removal space is set to 10 g / m ３ The method for producing a glass plate according to claim 2, wherein the above adjustment is performed.

4. A method for manufacturing a glass sheet as described in claim 3, wherein in the removal step, the absolute humidity of the removal space is adjusted by a humidity control device, the humidity control device having an absolute humidity measurement function for measuring the absolute humidity of the removal space and a humidification function for humidifying the removal space based on the measurement result of the absolute humidity of the removal space.

5. The method for manufacturing a glass sheet according to claim 1, wherein the removal step includes dehumidifying the removal space.

6. In the removal step, the absolute humidity of the removal space is set to 50 g / m ３ The method for producing a glass plate according to claim 5, wherein the following adjustment is made:

7. A method for manufacturing a glass sheet as described in claim 6, wherein in the removal step, the absolute humidity of the removal space is adjusted by a humidity control device, the humidity control device having an absolute humidity measurement function for measuring the absolute humidity of the removal space, and a dehumidification function for dehumidifying the removal space based on the measurement result of the absolute humidity of the removal space.

8. A method for manufacturing a glass plate, comprising a step of removing a glass plate from a glass plate package in which a glass plate laminate including a glass plate and a resin sheet is loaded on a pallet, wherein the absolute humidity of the removal space in which the removal step is carried out is 10 g / m ３ The method for producing a glass plate, comprising the steps of:

9. In the removal step, the absolute humidity of the removal space is 15 g / m ３ The method for producing a glass plate according to claim 8 .

10. In the removal step, the absolute humidity of the removal space is 50 g / m ３ The method for producing a glass plate according to claim 8, wherein the following is true:

11. The method for manufacturing a glass plate according to any one of claims 1 to 10, wherein in the removing step, the glass plate and the resin sheet are removed in a superposed state.

12. A method for manufacturing a glass plate according to any one of claims 1 to 10, wherein in the removal process, the tact time from removing the glass plate from the glass plate package to removing the next glass plate to be removed is 20 seconds or less.

13. The method for manufacturing glass sheets according to any one of claims 1 to 10, wherein the glass sheet package is a glass sheet stack loaded on the pallet in a vertical position.

14. The method for manufacturing a glass plate according to claim 13, wherein in the removing step, the glass plate is removed while being supported at its upper end.

15. The surface resistivity of the resin sheet in the removal space is 1×10 ９ Ω / □ or more 1×10 １２ The method for producing a glass plate according to any one of claims 1 to 10, wherein the linear modulus of elasticity is Ω / □ or less.

16. A method for manufacturing a glass sheet according to any one of claims 1 to 10, wherein in the removal step, the temperature of the removal space is adjusted to 15°C or higher and 45°C or lower.

17. A method for manufacturing a glass plate according to any one of claims 1 to 10, wherein the resin sheet is a foamed resin sheet.

18. A glass plate manufacturing apparatus comprising an unloading device for unloading a glass plate from a glass plate package in which a glass plate laminate including a glass plate and a resin sheet is loaded on a pallet, the unloading device being disposed in an unloading space and comprising a humidity control device for controlling the absolute humidity of the unloading space.

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