Method for processing glass plates removed from discarded refrigerator glass doors, polishing apparatus used in this processing method, glass surface polishing apparatus, and processing system.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- HITACHI GLOBAL LIFE SOLUTIONS INC
- Filing Date
- 2023-06-05
- Publication Date
- 2026-08-03
Smart Images
Figure 0007898692000001 
Figure 0007898692000002 
Figure 0007898692000003
Abstract
Description
Technical Field
[0001] The present invention relates to a method for treating a glass plate taken out from a waste glass door of a refrigerator, a polishing apparatus used in this treatment method, a glass surface polishing apparatus, and a treatment system.
Background Art
[0002] Recycling of used refrigerators and industrial waste refrigerators has been carried out. In refrigerators, "glass doors" using, for example, glass plates have been increasingly adopted due to their high interior quality. In such a glass door, the glass plate is fixed to the door frame via an adhesive, and the internal space is filled with a heat insulating material such as foamed urethane. When recycling a refrigerator, the part including the glass plate is taken out from the glass door, but on the same side surface of the taken-out glass plate, foamed urethane, an adhesive, a coating film, etc. are attached. Since these become impurities when the glass is reused, it cannot be reused. Therefore, it is necessary to remove these from the surface of the glass plate. For example, Patent Document 1 describes a surface treatment apparatus that performs surface treatment using a rotating brush.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] The apparatus described in Patent Document 1 is not assumed to polish objects to which an adhesive, a coating film, etc. are attached in addition to a foamed heat insulating material such as a waste glass door, and there is room for improvement in processing efficiency.
Means for Solving the Problems
[0005] The treatment method of the present invention is for refrigeration warehouse taken out, It comprises a glass plate, a door frame provided on the periphery of the glass plate, and an inner plate positioned spaced apart from the glass plate in the front-back direction. Abandoned glass door Separated from Also, substances adhering to the back surface and It has an uneven thickness and is bumpy. Foam insulation material attached The aforementioned A method for processing glass plates. ,before A preliminary step of removing at least a portion of the foamed insulation material from the glass plate, and Polish the surface of the glass plate. The glass surface polishing apparatus performs a subsequent step in which it polishes the glass plate to remove at least the deposits on the back surface, in this order. Furthermore, the processing system of the present invention is refrigerated warehouse Then I took it out. It comprises a glass plate, a door frame provided on the periphery of the glass plate, and an inner plate positioned spaced apart from the glass plate in the front-back direction. Abandoned glass door Separated from Also, substances adhering to the back surface and It has an uneven thickness and is bumpy. Foam insulation material attached The aforementioned A glass plate processing system comprising: a polishing device equipped with a rotating brush that performs a preliminary step of removing at least a portion of the foamed insulation material from the glass plate; and a glass surface polishing device positioned downstream of the polishing device that performs a preliminary step of polishing the surface of the glass plate to remove at least the material adhering to the back surface; of Prepare. [Brief explanation of the drawing]
[0006] [Figure 1] This is an overall configuration diagram of the processing system including the polishing apparatus and the glass surface polishing apparatus of this embodiment. [Figure 2A] This is a disassembled perspective view of a discarded glass door. [Figure 2B] This is a cross-section of a discarded glass door. [Figure 2C] This is a partially enlarged view of Figure 2B. [Figure 3] This is a diagram illustrating the state of the glass surface during the polishing process of discarded glass doors. [Figure 4A] This is a diagram showing the configuration of a glass surface polishing apparatus. [Figure 4B] This is another configuration diagram of a glass surface polishing apparatus. [Figure 5] This is a cross-sectional view showing the distance between the rotating brush and the glass plate. [Figure 6] This diagram shows the polishing state of glass plates at different insertion angles. [Figure 7]It is a graph showing the relationship between the rotational speed of the rotary brush and the glass surface temperature.
Embodiment for Carrying out the Invention
[0007] FIG. 1 is an overall configuration diagram of a processing system including a polishing apparatus (urethane polishing apparatus) and a glass surface polishing apparatus according to the present embodiment. As shown in FIG. 1, the glass surface polishing apparatus 1 of the present embodiment includes three rotary brushes 1A, 1B, and 1C and a conveying unit 2.
[0008] The rotary brushes 1A to 1C are cylindrical brushes, which are configured by implanting a large number of metal wires such as steel around a cylindrical base for 360 degrees. The rotary brush 1A is located on the most upstream side, and the rotary brush 1C is located on the most downstream side.
[0009] The conveying unit 2 is configured, for example, by combining rollers having substantially the same diameter as the rotary brushes 1A to 1C provided below the rotary brushes 1A to 1C in the vertical direction and small-diameter rollers provided before and after the conveying direction.
[0010] Also, a polishing apparatus 40 (urethane polishing apparatus) is provided in the front stage (upstream side) of the glass surface polishing apparatus 1. This polishing apparatus 40 mainly removes the remaining urethane foam (foamed heat insulating material) adhered to the glass plate, and is composed of, for example, one rotary brush 41 and conveying means 42, similar to the glass surface polishing apparatus 1.
[0011] A belt conveyor 3 as a conveying means is provided between the polishing apparatus 40 and the glass surface polishing apparatus 1. This belt conveyor 3 is configured such that the glass plate 10 (see FIG. 2A) polished by the polishing apparatus 40 is conveyed toward the glass surface polishing apparatus 1. The conveying unit 2, the belt conveyor 3, and the conveying means 42 may be integrally configured by two or three.
[0012] FIG. 2A is an exploded perspective view of the waste glass door, FIG. 2B is a cross-sectional view of the waste glass door, and FIG. 2C is a partially enlarged view of FIG. 2B. As shown in FIG. 2A, the waste glass door 5 includes a glass plate 10 provided on the surface, a door frame 20 provided on the periphery of the glass plate 10, a vacuum heat insulating material 30 disposed on the back surface or the back side of the glass plate 10, a foamed heat insulating material 50 (see FIG. 2B) filled in a space Q formed by the glass plate 10 and the door frame 20, and an inner plate 60 provided on the back surface (rear surface) of the door frame 20.
[0013] The glass plate 10 is composed of a light-transmitting rectangular flat plate member that forms the outer wall (outline, design surface) on the surface (front surface) side of the waste glass door 5. The outer peripheral portion of the glass plate 10 is attached to the inner front end portion of the vertically long rectangular frame-shaped door frame 20 and is covered by the door frame 20. This door frame 20 is formed of, for example, an ABS (acrylonitrile butadiene styrene copolymer) resin.
[0014] The door frame 20 is constituted by a combination of a frame member 21 formed along the right edge portion of the glass plate 10, a frame member 22 formed along the left edge portion of the glass plate 10, a frame member 23 formed along the upper edge portion of the glass plate 10, and a frame member 24 formed along the lower edge portion of the glass plate 10.
[0015] A flange portion 22a that protrudes inward is formed on the frame member 22. This flange portion 22a is formed along the left edge portion of the glass plate 10. Similarly to the frame member 22, flange portions 23a, 24a, and 21a are also formed on the frame members 23, 24, and 21.
[0016] As shown in Figure 2B, the waste glass door 5 is configured such that the glass plate 10 and the inner plate 60 are spaced apart in the front-to-back direction (front-to-back direction), the vacuum insulation material 30 is placed in the space Q, and the foamed insulation material 50 (insulation material) is placed in the space excluding the vacuum insulation material 30. The vacuum insulation material 30 may be attached to the back surface of the glass plate 10 spaced apart from the flange portions 21a to 24a, or it may be attached to the inner plate 60, or it may be installed between the glass plate 10 and the inner plate 60. When it is attached to the back surface of the glass plate 10, the back surface of the glass plate 10 is exposed to the space Q between the flange portions 21a to 24a and the vacuum insulation material 30, and the foamed insulation material 50 is adhered to the back surface of the glass plate 10 in this area. In any case, at least a small amount of foamed insulation material 50 is adhered to the back surface of the glass plate 10.
[0017] The foamed insulation material 50 has both the function of an insulating material and the function of an adhesive. Furthermore, the foamed insulation material 50 is adhered to the inner wall surface of the space Q formed by the glass plate 10 on which the vacuum insulation material 30 is placed in the center, and the door frame 20 attached to the outer periphery of the glass plate 10, by filling the space Q with the vacuum insulation material 30 in between, for example. In this case, the foamed insulation material 50 is adhered to the back surface of the glass plate 10 while covering the vacuum insulation material 30. The foamed insulation material 50 is made of rigid polyurethane foam.
[0018] Furthermore, a coating 80, which is an example of a back surface deposit, is formed on the back surface of the glass plate 10. A shatterproof film (not shown) is provided on the back surface of this coating 80.
[0019] As shown in Figure 2C, the flange portion 22a is a plate-shaped member in cross-sectional view that extends parallel to the glass plate 10. Furthermore, the flange portion 22a is formed extending in a direction perpendicular to the plane of the paper in Figure 2C.
[0020] Furthermore, the flange portion 22a is provided with an adhesive tape 70 (adhesive material), which is an example of a back-surface adhering material and an example of an adhesive. This adhesive tape 70 is provided in a strip shape along the flange portion 22a. The adhesive tape 70 is also formed along the left edge of the glass plate 10. The glass plate 10 is then pressed against the adhesive tape 70, thereby bonding and fixing the glass plate 10 to the frame member 22. In this embodiment, adhesive tape 70 has been used as an example, but other adhesive materials such as hot melt adhesive may be used. Although not shown in the figures, adhesive tape is also provided in a strip shape on the other flange portions 21a, 23a, and 24a (see Figure 2A), and the right edge, upper edge, and lower edge of the glass plate 10 are bonded and fixed to it. Note that the term "strip shape" here does not refer to a specific thickness, but may also refer to a linear shape.
[0021] The discarded glass door 5, configured in this way, is separated from the glass plate 10 by, for example, cutting the door frame 20 together with a blade. As a method of separation, for example, the separation process described in Japanese Patent Publication No. 7195234 can be used. However, the surface (back side) of the separated glass plate 10 will have the coating 80 (see Figure 2B), adhesive tape 70, and foamed insulation material 50 (see Figure 2B) attached to it. In this state, the glass plate 10 cannot be reused, so it is necessary to remove the coating 80, adhesive tape 70, and foamed insulation material 50 remaining on the glass plate 10. Note that the glass plate 10 may also be one without the coating 80.
[0022] Figure 3 is a diagram showing the state of the glass surface during the polishing process of a discarded glass door. In Figure 3, the state before being placed in the polishing device 40 is designated as glass plate 10A, the state after being placed in the polishing device 40 is designated as glass plate 10B, and the state after being placed in the glass surface polishing device 1 is designated as glass plate 10C. Glass plate 10A is in a state where the vacuum insulation material 30 (see Figure 2B) has been removed or was not originally attached to the glass plate 10.
[0023] As shown in the left diagram of Figure 3, the glass plate 10A, separated from the discarded glass door 5, has attached materials such as foamed insulation material 50, adhesive tape 70, and coating 80 remaining on it. Specifically, the coating 80 remains on the surface (back surface) of the glass material 11, and the adhesive tape 70 and foamed insulation material 50 remain on top of the coating 80. In the case of a glass plate 10A that does not have a coating 80 applied, the adhesive tape 70 and foamed insulation material 50 will remain directly on the back surface of the glass plate 10A.
[0024] By the way, if the glass plate 10A is fed into the glass surface polishing device 1 with the foamed insulation material 50 still attached to it, urethane debris will fly around inside the glass surface polishing device 1 and adhere to the rollers of the conveying unit 2. This urethane debris will be compressed by the rollers of the conveying unit 2, resulting in uneven thickness of the rollers and causing uneven polishing. In addition, the frequency of maintenance to remove the urethane attached to the rollers will increase in order to suppress uneven polishing. For this reason, by providing a polishing device 40 in front of the glass surface polishing device 1 to perform a preliminary step of polishing (removing) the urethane, the amount of urethane polished in the glass surface polishing device 1 can be reduced. This reduces the amount of urethane fed into the glass surface polishing device 1 and suppresses the increase in the number of maintenance cycles. The foamed insulation material 50 (foamed urethane) attached to and deposited on the glass plate 10A is usually expected to have an uneven thickness and irregularities, although this depends on the method of separation from the waste glass door 5. Furthermore, at least in the convex portions, it is expected that they will be taller than the coating 80 and the adhesive tape 70, that is, they will protrude towards the foreground of the paper in Figure 3. As will be described later, the polishing device 40 can reduce the amount of urethane polished by the subsequent glass surface polishing device 1 by removing at least the portions of the foamed insulation material 50 that have a certain thickness (tall).
[0025] As shown in the center diagram of Figure 3, the glass plate 10A that is fed into the polishing device 40 becomes a glass plate 10B in which at least a portion of the foamed insulation material 50 has been removed. In the center diagram of Figure 3, the foamed insulation material 50 is not shown for the sake of explanation. In this glass plate 10B, the coating film 80 remains on the surface of the glass material 11, and the adhesive tape 70 (adhesive material) remains on top of the coating film 80.
[0026] Then, the glass plate 10B, with the coating 80 and adhesive tape 70 remaining, is fed into the glass surface polishing apparatus 1. As a result, as shown in the right diagram of Figure 3, the glass plate 10C (only the transparent glass material 11) is obtained, with the coating 80 and adhesive tape 70 removed from the glass plate 10B.
[0027] Figure 4A is a diagram showing the configuration of a glass surface polishing apparatus. As shown in Figure 4A, the glass surface polishing apparatus 1 is composed of rotating brushes 1A, 1B, and 1C, a transport unit 2 (transport means) for transporting the glass plate 10, and an angle guide jig 6 for guiding the orientation (angle during transport) of the glass plate 10. Note that in Figure 4A, the transport unit 2 is shown in a different shape from Figure 1, resembling a belt conveyor.
[0028] The rotating brushes 1A, 1B, and 1C are arranged at equal intervals along the conveying direction S1 of the conveying unit 2. Furthermore, the rotating shafts 1g of the rotating brushes 1A to 1C are arranged in a direction that is not parallel to the conveying direction S1, for example, perpendicular to it. The rotating shafts 1g of the rotating brushes 1A to 1C are all parallel to each other. An electric motor (not shown) is connected to each rotating shaft 1g of the rotating brushes 1A to 1C, providing the driving force to rotate the rotating brushes 1A to 1C. The rotation direction W of the rotating brushes 1A to 1C is the same for all of them, which is the clockwise direction (W direction) as shown in Figure 1.
[0029] The angle guide jig 6 is positioned near the transport unit 2 and has a contact portion 6a that contacts one of the four sides (two long sides 10a and two short sides 10b) of the glass plate 10 (short side 10b). The operator manually brings the short side 10b of the glass plate 10 into contact with the contact portion 6a, tilting the glass plate 10 with respect to the transport direction S1. Then, while maintaining the orientation of the glass plate 10, it is fed into the transport unit 2 (the glass plate 10 is placed on the transport unit 2). As a result, the glass plate 10 is guided so that the angle between the extending direction S2 of the adhesive tape 70 and the transport direction S1 of the glass plate 10 is θ°. In other words, the glass plate 10 is fed into the glass surface polishing device 1 in an inclined state with respect to the transport direction S1 of the glass plate 10. Here, the extending direction S2 of the adhesive tape 70 is described as being along the long side 10a of the glass plate 10. Furthermore, since the contact portion 6a merely guides the insertion angle of the glass plate 10, it can be used with glass plates 10 to which the adhesive tape 70 is attached along the edge of the glass plate 10. Also, the angle θ is set to 10° or more and 30° or less (10~30°).
[0030] In the glass surface polishing apparatus 1 configured in this way, the adhesive tape 70 forms an angle θ° with respect to the transport direction S1, which prevents the adhesive tape 70 from continuously contacting the same spot on the rotating brushes 1A to 1C. In the glass plate 10 of this embodiment, the adhesive tape 70 is attached in a direction along both the short and long directions of the rectangular glass plate 10. As a result, the glass plate 10 is fed in at an angle (non-parallel angle) that is inclined with respect to the transport direction S1, not only in the short direction but also in the long direction. The glass plate 10 is transported by the transport unit 2 and first polished by the rotating brush 1A. At this time, the adhesive tape 70 located in the extending direction S2 passes through point P10 on the rotating brush 1A when it is located at point P1. Also, the adhesive tape 70 located at point P2 passes through point P20 on the rotating brush 1A. In this way, the adhesive tape 70, which is an example of an adhesive substance that causes contamination of the rotating brush 1A, does not pass over the same position on the rotating brush 1A, thus preventing the deterioration of the rotating brush 1A from accelerating. In other words, it is possible to suppress unevenness in which the adhesive material repeatedly comes into contact with the same part of the rotating brush 1A, causing the brush surface to be coated or contaminated with the adhesive.
[0031] Furthermore, regarding the adhesive tape 70 provided on the shorter side of the glass plate 10 (the direction perpendicular to the extending direction S2), the glass plate 10 is fed in such a state that the extending direction of the adhesive tape 70 remaining on the glass plate 10 is inclined with respect to the axial direction G of the rotating brush 1A and also inclined with respect to the transport direction S1 of the glass plate 10. Therefore, similar to the adhesive tape 70 provided on the extending direction S2, the adhesive tape 70 does not pass over the same position on the rotating brush 1A repeatedly, thus preventing premature deterioration of the rotating brush 1A. Since the waste glass door 5 of a refrigerator often has rectangular adhesive tape 70 along the edge of the glass plate 10 in this manner, the work is carried out so that the direction in which the glass plate 10 is fed corresponds to such cases. For example, when processing a rectangular glass plate 10 with adhesive tape 70 attached diagonally, the transport direction S1 can be made parallel to the longitudinal or short side of the glass plate 10. That is, the transport direction S1 should be made non-parallel to the adhesive tape 70. It is preferable that all adhesive tapes 70 be non-parallel to the transport direction S1, but if this is difficult, it is preferable that any of the adhesive tapes 70 other than the shortest adhesive tape 70 be non-parallel to the transport direction S1, and it is even more preferable that the longest adhesive tape 70 be non-parallel to the transport direction S1.
[0032] Then, before the entire glass plate 10 is polished by the rotating brush 1A, polishing is performed by the next rotating brush 1B. In this case as well, since the orientation of the glass plate 10 is maintained, the adhesive tape 70 does not pass over the same position on the rotating brush 1B repeatedly, and the deterioration of the rotating brush 1B is prevented from accelerating.
[0033] Then, before the entire glass plate is polished by the rotating brush 1B, polishing is performed by the next rotating brush 1C. In this case as well, since the orientation of the glass plate 10 is maintained, the adhesive tape 70 does not pass over the same position on the rotating brush 1B repeatedly, and the deterioration of the rotating brush 1B is prevented from accelerating.
[0034] In this manner, a subsequent process is carried out to remove the adhesive tape 70. The adhesive tape 70 and coating 80 attached to the glass plate 10 are removed, and the glass plate becomes transparent and is discharged from the glass surface polishing apparatus 1.
[0035] Furthermore, as shown in Figure 1, the rotation direction of the rotating brushes 1A to 1C is set so that the brush surface contacts the glass plate 10 from a direction opposite to the transport direction S1 of the glass plate 10. This improves the removal performance of adhesive tape 70 and coating 80 from the glass plate 10. Thus, the process of tilting the glass plate 10 at an angle θ° with respect to the transport direction S1, that is, with respect to the rotating brushes 1A to 1C, may be performed further upstream, for example, when feeding it into the transport means 42, as long as the orientation of the glass plate 10 is generally maintained.
[0036] Figure 4B is another configuration diagram of the glass surface polishing apparatus. As shown in Figure 4B, the glass surface polishing apparatus 1 is equipped with an angle guide means 7 that guides the glass plate 10 in an inclined state. This angle guide means 7 is formed by creating an input instruction line 7a (instruction line) on the belt surface of the belt conveyor, which serves as the transport section 2, to indicate the orientation of the glass plate 10. The operator manually aligns the short side 10b of the glass plate 10 with the input instruction line 7a and then places it onto the transport section 2. This method makes it possible to adjust the angle appropriately without using a jig, improving the work efficiency of the operator. Alternatively, the instruction line could be projected near the input opening using a laser or irradiation device. Another method is to prepare a camera that images the glass plate 10 being inserted, use image recognition on the camera image to determine the insertion angle of the adhesive tape 70, and issue an alarm if the angle is inappropriate. Furthermore, by forming the input instruction line 7a at regular intervals, it is possible to prevent over-insertion of the glass plate 10 and allow even inexperienced operators to grasp the appropriate guideline for insertion.
[0037] Furthermore, the means for guiding the orientation of the glass plate 10 is not limited to the forms shown in Figures 4A and 4B. For example, instead of manual operation, the system may use image recognition to determine the extension direction of the adhesive tape 70, and a robotic hand may be used to grasp the glass plate 10 and change its orientation. Alternatively, without providing auxiliary means such as the angle guide jig 6 or the input instruction line 7a, the operator may visually adjust the transport direction S1 so that it is not parallel to the extension direction of the adhesive tape 70.
[0038] Figure 5 is a cross-sectional view showing the distance between the rotating brush and the glass plate. In the polishing device 40, the rotating brush 41 is positioned at a shallow enough distance to remove the foamed insulation material 50 remaining on the glass plate 10. As shown in Figure 5, let R1 be the distance between the rotation center O1 of the rotating brush 1A and the surface 10s of the glass plate 10. Let R2 be the distance between the rotation center O2 of the rotating brush 1B and the surface 10s of the glass plate 10. Let R3 be the distance between the rotation center O3 of the rotating brush 1C and the surface 10s of the glass plate 10. At this time, the distances between the rotating brushes 1A to 1C and the surface 10s of the glass plate 10 are set such that R1 ≥ R2 ≥ R3. This prevents excessive load on the rotating brushes 1A to 1C and improves the removal performance of the adhesive tape 70 and coating 80 from the glass plate 10. In addition, the distance R0 between the rotation center O0 of the rotating brush 41 of the polishing device 40 and the surface 10s of the glass plate 10 is R0 > R1. However, these relationships are valid when the diameters of each rotating brush 1A, 1B, 1C, and 41 are the same. A more general approach would be to define the distances from the brush tips of each rotating brush 1A, 1B, 1C, and 41 to the surface 10s as R1, R2, R3, and R0, respectively.
[0039] Furthermore, it is preferable that the brush tip of the rotating brush 41 is positioned so that it can contact and remove the foamed insulation material 50, but does not reach the surface 10s. The thickness of the foamed insulation material 50 is not uniform even on a single glass plate 10, and it is uneven with variations in thickness. Also, there are often parts of the foamed insulation material 50 that are thicker than the adhesive tape 70. If the glass plate 10 is directly fed into the glass surface polishing device 1 with the thick foamed insulation material 50 as is, or with large variations in thickness, a large amount of urethane debris will adhere to the rotating brushes 1A to 1C, and uneven adhesion is likely to occur. As a result, uneven polishing of the surface 10s is likely to occur. In this embodiment, a rotating brush 41 is provided that can remove at least a portion of the foamed insulation material 50 and make its thickness uniform before processing with the rotating brushes 1A to 1C that reach the surface 10s. Therefore, the amount of urethane debris adhering to the glass surface polishing device 1 can be reduced, and the unevenness of its adhesion can also be reduced.
[0040] As an alternative means of reducing the amount of urethane processed by the glass surface polishing device 1, the foam insulation material 50 may be removed by hand by an operator as a pre-process instead of using the polishing device 40. The foam insulation material 50 deposited on the glass plate 10 is thicker and less adhesive than adhesive tape 70, etc., so it can be removed to some extent by hand or scraper.
[0041] Figure 6 shows the polishing results when the glass plate insertion angle is changed. The glass insertion angle is the insertion angle of the glass plate 10, which corresponds to the angle θ shown in Figure 4A. As shown in Figure 6, when the glass insertion angle was 45°, the adhesive tape 70 was removed, but some of the coating 80 remained in the center of the glass plate 10, resulting in a × (poor) result. When the glass insertion angle was 30°, both the adhesive tape 70 and the coating 80 were removed, resulting in a ○ (good) result. When the glass insertion angle was 20°, both the adhesive tape 70 and the coating 80 were removed, resulting in a ○ (good) result. Thus, the results showed that the adhesive tape 70 and the coating 80 could be removed depending on the glass insertion angle, but even when the glass insertion angle was 30° or 20°, the surface of the glass plate 10 turned black.
[0042] Figure 7 is a graph showing the relationship between the rotation speed of the rotating brush and the glass surface temperature. In Figure 7, the graph without diagonal lines represents the case when the rotation speed of the rotating brush is 1800 rpm, and the graph with diagonal lines represents the case when the rotation speed of the rotating brush is 1440 rpm. The horizontal axis, 1 pass, represents the surface temperature of the glass plate 10 when polished with the first rotating brush of the glass surface polishing device 1, and 2 passes represents the surface temperature of the glass plate 10 when polished with the second rotating brush. Furthermore, when the rotation speed of the rotating brush is 1800 rpm, up to 2 passes are used, and when the rotation speed of the rotating brush is 1440 rpm, 3 passes are used. The graph also shows the variation (error range) of the glass surface temperature.
[0043] As shown in Figure 7, when the rotation speed of the rotating brush is 1800 rpm (high rotation speed), the glass surface temperature rises in the second pass. At this time, the coating 80 and adhesive tape 70 burn, and the glass plate 10 discolors. In the inventors' environment, ester-based components and paraffinic hydrocarbons were detected in the discolored area, suggesting that urethane and adhesive components are the cause of the burning. Therefore, in this embodiment, by dividing the process into three passes (rotating brushes 1A to 1C) and reducing the rotation speed from 1800 rpm to 1440 rpm, the temperature rise of the glass plate 10 is suppressed, and discoloration is prevented. In this way, by using three rotating brushes 1A to 1C, the rotation speed can be set to 1500 rpm or less, 1450 rpm or less, or 1440 rpm or less, and it was confirmed that the rise in glass surface temperature can be suppressed. Furthermore, by reducing the rotation speed of the rotating brushes 1A to 1C, noise and vibration can also be suppressed, improving the working environment and enabling energy saving.
[0044] As described above, the processing method of this embodiment is a method for processing a glass plate 10 to which adhesive tape 70, coating 80, and foamed insulation material 50 have been attached, which has been removed from a used glass door 5 of a refrigerator, and is performed in the following order: a preparation step of preparing a glass surface polishing device 1 to polish the surface of the glass plate 10; a pre-step of removing at least a portion of the foamed insulation material 50 from the glass plate 10; and a post-step of the glass surface polishing device 1 polishing the glass plate 10 to remove at least the adhesive tape and coating 80. This makes it possible to reduce the amount of urethane (foamed insulation material 50) polished by the glass surface polishing device 1, prevent uneven polishing by the glass surface polishing device 1, and suppress an increase in the frequency of maintenance of the glass surface polishing device 1.
[0045] Furthermore, in the processing method of this embodiment, the glass surface polishing apparatus 1 comprises rotating brushes 1A to 1C for polishing the glass plate 10, and a transport unit 2 for transporting the glass plate 10 toward the rotating brushes 1A to 1C. The adhesive tape 70 is an adhesive material that extends in a strip shape along the surface of the glass plate 10. The rotating brushes 1A to 1C polish the glass plate 10 with the extension direction S2 of the adhesive material inclined with respect to the transport direction S1 of the transport unit 2. This prevents the adhesive tape 70 from continuously contacting the same spot on the rotating brushes 1A to 1C, thus preventing the deterioration of the rotating brush 1A from accelerating.
[0046] Furthermore, in the processing method of this embodiment, the glass plate 10 has a plurality of adhesive tapes 70 extending in different directions from each other, and the glass plate 10 is fed into the transport unit 2 in a state inclined with respect to the transport direction S1 of the transport unit 2, with at least the shortest adhesive tape 70 (adhesive material in the longitudinal direction) among the adhesive tapes 70. This prevents the adhesive tape 70 remaining on the glass plate 10 from continuously contacting the same part of the rotating brushes 1A to 1C, thereby preventing the deterioration of the rotating brushes 1A to 1C from accelerating.
[0047] Furthermore, in the processing method of this embodiment, the inclination angle θ of the adhesive tape 70 with respect to the transport direction S1 is 10 to 30°. This improves the removal performance of the adhesive tape 70 and the coating film 80.
[0048] Furthermore, the polishing apparatus of this embodiment has a rotating brush 41 that is used in the preceding process but not in the subsequent process. By using a rotating brush 41 separate from the rotating brushes 1A to 1C, the rotating brush 41 can be set at a shallow position that is sufficient to remove the foamed insulation material 50 remaining on the glass plate 10.
[0049] Furthermore, in the polishing apparatus of this embodiment, the rotating brush 41 is positioned so as not to reach the surface of the glass plate 10. This makes it possible to remove at least a portion of the foamed insulation material 50 and to make its thickness uniform.
[0050] Furthermore, the glass surface polishing apparatus of this embodiment is equipped with an angle guide jig 6 that guides the orientation of the adhesive tape 70 before it is inserted. This makes it easier to insert the glass plate 10 in a predetermined orientation.
[0051] Furthermore, in the glass surface polishing apparatus of this embodiment, three or more rotating brushes 1A to 1C are arranged at intervals along the transport direction S1 of the glass plate 10, and the rotation speed of each rotating brush 1A to 1C is 1450 rpm or less. With this arrangement, by increasing the number of rotating brushes 1A to 1C, the rotation speed of each rotating brush 1A to 1C can be lowered, thereby preventing discoloration of the glass plate 10 due to burning. Note that the number of rotating brushes 1A to 1C is not limited to three, but may be four or more.
[0052] Furthermore, the processing system of this embodiment is a processing system for a glass plate 10 to which adhesive tape 70, coating 80, and foamed insulation material 50 have been attached, which has been removed from a used glass door 5 of a refrigerator. The system comprises a polishing device 40 equipped with a rotating brush 41 that performs a preliminary step of removing at least a portion of the foamed insulation material 50 from the glass plate 10, and a glass surface polishing device 1 positioned downstream of the polishing device that performs a preliminary step of polishing the surface of the glass plate 10 to remove at least the adhesive tape and coating 80. This reduces the amount of urethane (foamed insulation material 50) polished in the glass surface polishing device 1, prevents uneven polishing in the glass surface polishing device 1, and suppresses an increase in the frequency of maintenance of the glass surface polishing device 1.
[0053] It should be noted that the present invention is not limited to the embodiments described above, and various modifications are included. For example, in this embodiment, the case in which adhesive tape 70 is provided along the four sides of the glass plate 10 was described as an example, but the adhesive tape 70 may be arranged diagonally across the glass plate 10. In this case as well, by inserting the glass plate 10 perpendicular to the axial direction without tilting it, the adhesive tape 70 will not continue to come into contact with the same part of the rotating brush, thus preventing the rotating brush from deteriorating prematurely. [Explanation of symbols]
[0054] 1. Glass surface polishing apparatus 1A, 1B, 1C Rotating Brush 2. Conveying section (conveying means) 3 Belt conveyor 5. Discarded glass door 6. Angle guiding jig (angle guiding means) 7a Input indicator line (indicator line) 10 glass plates 40. Polishing equipment (urethane polishing equipment) 41. Rotating brush (a rotating brush not used in subsequent processes) 50. Foamed insulation material (insulation material, polyurethane foam) 70 Adhesive tape (adhesive material, backing material) 80. Coating film (deposits on the back surface) G-axis direction S1 Conveying direction S2 extension direction θ angle (tilt angle)
Claims
1. A method for processing a glass plate separated from a discarded glass door, which comprises a glass plate removed from a refrigerator, a door frame provided around the periphery of the glass plate, and an inner plate spaced apart from the glass plate in the front-back direction, the glass plate having a backside deposit and foam insulation material with uneven thickness and irregularities attached to it, A preliminary step of removing at least a portion of the foamed insulation material from the glass plate, A processing method comprising the following steps, in this order: a glass surface polishing apparatus polishes the surface of the glass plate, polishing the glass plate to remove at least the deposits on the back surface; and a subsequent step.
2. A method for processing a glass plate removed from a used glass door of a refrigerator, which has residue and foam insulation material attached to its back surface, A preliminary step of removing at least a portion of the foamed insulation material from the glass plate, The glass surface polishing apparatus polishes the surface of the glass plate, and the subsequent steps of polishing the glass plate and removing at least the deposits on the back surface are performed in this order. The glass surface polishing apparatus is A rotating brush for polishing the glass plate, The system includes a conveying means for conveying the glass plate toward the rotating brush, The aforementioned back surface deposit is an adhesive material that extends in a strip along the surface of the glass plate. A method for polishing a glass plate by a rotating brush, wherein the extending direction of the adhesive material is inclined with respect to the conveying direction of the conveying means.
3. The processing method according to claim 2, The glass plate has a plurality of adhesive materials extending in different directions from each other. The glass plate is processed in a manner in which at least one of the adhesive materials, which is not the shortest length, is fed into the conveying means at an angle with respect to the conveying direction of the conveying means.
4. The processing method according to claim 2, A processing method wherein the inclination angle of the adhesive material with respect to the transport direction is 10 to 30°.
5. A polishing apparatus used in the processing method described in any one of claims 1 to 4, A polishing apparatus having a rotating brush used in the preceding process but not in the following process.
6. The polishing apparatus according to claim 5, The polishing device is positioned such that the rotating brush does not reach the surface of the glass plate.
7. A glass surface polishing apparatus used in the processing method described in any one of claims 2 to 4, A glass surface polishing apparatus equipped with an angle guiding means for guiding the orientation of the adhesive material before it is introduced.
8. A glass surface polishing apparatus used in the processing method described in any one of claims 2 to 4, The rotating brushes consist of three or more brushes arranged at intervals along the direction in which the glass plate is transported. A glass surface polishing apparatus in which the rotational speed of each of the aforementioned rotating brushes is 1450 rpm or less.
9. A processing system for a glass plate separated from a waste glass door, which comprises a glass plate removed from a refrigerator, a door frame provided around the periphery of the glass plate, and an inner plate spaced apart from the glass plate in the front-back direction, wherein the glass plate has a back-side deposit and foam insulation material with uneven thickness and irregularities attached to it. A polishing apparatus equipped with a rotating brush performs a preliminary step of removing at least a portion of the foamed insulation material from the glass plate, A processing system comprising a glass surface polishing device, which is positioned downstream of the polishing device and performs a subsequent step of polishing the surface of the glass plate to remove at least the deposits on the back surface.
10. A method for processing a glass plate with a back surface deposit and foam insulation material attached, which has been removed from a used glass door of a refrigerator, Glass surface polishing equipment, A rotating brush for polishing the glass plate, The system includes a conveying means for conveying the glass plate toward the rotating brush, The aforementioned back surface deposit is an adhesive material that extends in a strip along the surface of the glass plate. A processing method in which the rotating brush polishes the glass plate and removes at least the material adhering to the back surface, with the extending direction of the adhesive material being inclined with respect to the conveying direction of the conveying means.