Processing method of glass plate taken out from waste glass door of refrigerator, polishing device used for the processing method, glass surface polishing device, and processing system

Abstract

To provide a processing method of a glass plate capable of preventing uneven polishing while reducing maintenance frequency, a polishing device, a glass surface polishing device, and a polishing system.SOLUTION: The present invention provides a processing method of a glass plate to which backside deposits and a foam heat insulating material adhere and which is taken out from a waste glass door of a refrigerator. The method includes: a preparation step of preparing a glass surface polishing device to polish a surface of the glass plate; a pre-processing step of removing at least a part of the foam heat insulation material from the glass plate; and a post-processing step of causing the glass surface polishing device to polish the glass plate, thereby removing at least the backside deposits, where these steps are executed in this order.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for treating glass plates removed from discarded glass doors of refrigerators, a polishing device, a glass surface polishing device, and a treatment system used in the treatment method. [Background technology]

[0002] Used refrigerators and refrigerators that have become industrial waste are being recycled. For example, "glass doors" using glass plates are increasingly being used for refrigerators because of their high interior design appeal. In such glass doors, 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 urethane foam. When recycling a refrigerator, a part including the glass plate is removed from the glass door, but urethane foam, adhesive, coating film, etc. are attached to the same side of the removed glass plate. These become impurities when the glass is reused, so 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 device that performs surface treatment using a rotating brush. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5163977 Summary of the Invention [Problem to be solved by the invention]

[0004] The device described in Patent Document 1 is not designed for polishing objects that have adhesives, coatings, etc. attached in addition to foam insulation, such as waste glass doors, and there is room for improvement in terms of processing efficiency. [Means for solving the problem]

[0005] The processing method of the present invention is a method for processing a glass plate having back-side adhesions and foam insulation attached thereto, which is removed from a discarded glass door of a refrigerator, and includes, in this order, a preparation step of preparing a glass surface polishing device for polishing the surface of the glass plate, a pre-step of removing at least a portion of the foam insulation from the glass plate, and a post-step of polishing the glass plate with the glass surface polishing device to remove at least the back-side adhesions. In addition, the processing system of the present invention is a processing system for a glass plate having back-side adhesions and foam insulation material attached thereto, which is removed from a discarded glass door of a refrigerator, and includes a polishing device equipped with a rotating brush that performs a pre-process of removing at least a portion of the foam insulation material from the glass plate, and a glass surface polishing device that is arranged downstream of the polishing device and performs a post-process of polishing the surface of the glass plate to remove at least the back-side adhesions. [Brief description of the drawings]

[0006] [Figure 1] 1 is an overall configuration diagram of a processing system including a polishing apparatus and a glass surface polishing apparatus according to an embodiment of the present invention. [Figure 2A] FIG. [Figure 2B] FIG. 1 is a cross-sectional view of a discarded glass door. [Figure 2C] FIG. 2C is a partially enlarged view of FIG. 2B. [Diagram 3] This is a state diagram of the glass surface during the polishing process of waste glass doors. [Figure 4A] FIG. 1 is a configuration diagram of a glass surface polishing device. [Figure 4B] FIG. 2 is another configuration diagram of the glass surface polishing apparatus. [Diagram 5] FIG. 4 is a cross-sectional view showing the distance between the rotating brush and the glass plate. [Figure 6] 11A and 11B are diagrams showing polishing states resulting from different input angles of a glass plate. [Figure 7] 4 is a graph showing the relationship between the rotation speed of the rotating brush and the glass surface temperature. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] FIG. 1 is a diagram showing the overall configuration of a processing system including a polishing apparatus (urethane polishing apparatus) and a glass surface polishing apparatus according to this embodiment. As shown in FIG. 1, the glass surface polishing apparatus 1 of the present embodiment includes three rotating brushes 1A, 1B, and 1C, and a conveying section 2. The conveying section 2 is a conveying unit.

[0008] The rotating brushes 1A to 1C are cylindrical brushes, each of which is constructed by implanting a large number of wires made of metal such as steel 360 degrees into a cylindrical base. The rotating brush 1A is located on the most upstream side, and the rotating brush 1C is located on the most downstream side.

[0009] The transport unit 2 is configured by combining, for example, rollers of approximately the same diameter as the rotating brushes 1A-1C provided vertically below the rotating brushes 1A-1C, and smaller diameter rollers provided at the front and rear in the transport direction.

[0010] A polishing device 40 (urethane polishing device) is provided in the upstream stage (upstream side) of the glass surface polishing device 1. This polishing device 40 is mainly used to remove the remaining urethane foam (foamed insulating material) adhered to the glass plate, and similar to the glass surface polishing device 1, is composed of, for example, one rotating brush 41 and a conveying means 42.

[0011] A belt conveyor 3 serving as a transport means is provided between the polishing device 40 and the glass surface polishing device 1. This belt conveyor 3 is configured so that the glass plate 10 (see FIG. 2A) polished by the polishing device 40 is transported toward the glass surface polishing device 1. Two or three of the transport section 2, the belt conveyor 3, and the transport means 42 may be integrally configured.

[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 an enlarged view of a portion of FIG. 2B. As shown in Figure 2A, the waste glass door 5 is composed of a glass plate 10 provided on the front surface, a door frame 20 provided around the periphery of the glass plate 10, a vacuum insulation material 30 arranged on the back or rear side of the glass plate 10, a foam insulation material 50 (see Figure 2B) filled in the space Q formed by the glass plate 10 and the door frame 20, and an inner panel 60 provided on the back (rear side) of the door frame 20.

[0013] The glass plate 10 is made of a translucent rectangular flat plate member that forms the outer wall (outer shell, design surface) on the front side (front surface) of the waste glass door 5. The outer periphery of the glass plate 10 is attached to the inner front end of the door frame 20, which is a vertically long rectangular frame, and is covered by the door frame 20. This door frame 20 is made of, for example, ABS (acrylonitrile butadiene styrene copolymer) resin.

[0014] The door frame 20 is constructed by combining a frame member 21 formed along the right edge of the glass plate 10, a frame member 22 formed along the left edge of the glass plate 10, a frame member 23 formed along the upper edge of the glass plate 10, and a frame member 24 formed along the lower edge of the glass plate 10.

[0015] The frame member 22 is formed with a flange portion 22a that protrudes inward. The flange portion 22a is formed along the left edge portion of the glass plate 10. Similarly to the frame member 22, the frame members 23, 24, and 21 are also formed with flange portions 23a, 24a, and 21a.

[0016] As shown in FIG. 2B, the waste glass door 5 is configured such that the glass plate 10 and the inner plate 60 are arranged in a spaced relationship in the front-rear direction (front-rear direction), the vacuum insulation material 30 is arranged in the space Q, and the foam insulation material 50 (thermal insulation material) is arranged in the space other than the vacuum insulation material 30. The vacuum insulation material 30 may be attached to the rear surface of the glass plate 10 at a distance from the flange portions 21a to 24a, or may be attached to the inner plate 60, or may be attached between the glass plate 10 and the inner plate 60. When attached to the rear surface of the glass plate 10, the rear 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 foam insulation material 50 is bonded to the rear surface of the glass plate 10 in this portion. In any case, the foam insulation material 50 is bonded to the rear surface of the glass plate 10, even if it is a small amount.

[0017] The foamed insulation material 50 has a function as an insulation material and a function as an adhesive. The foamed insulation material 50 is filled into a space Q formed by a glass plate 10 with a vacuum insulation material 30 placed in the center and a door frame 20 attached to the outer periphery of the glass plate 10, for example, with the vacuum insulation material 30 interposed therebetween, and is thereby adhered to the inner wall surface of the space Q. 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 formed of a rigid urethane foam.

[0018] In addition, a coating film 80, which is an example of a back surface attachment, is formed on the back surface of the glass plate 10. On the back surface of this coating film 80, a shatterproof film (not shown) is provided.

[0019] As shown in Fig. 2C, the flange portion 22a is a plate-shaped member in a cross-sectional view extending parallel to the glass plate 10. Moreover, the flange portion 22a is formed extending in a direction perpendicular to the paper surface of Fig. 2C.

[0020] The flange portion 22a is provided with an adhesive tape 70 (adhesive material) as an example of a back surface attachment and as an example of an adhesive. The adhesive tape 70 is provided in a strip shape along the flange portion 22a. The adhesive tape 70 is formed along the left edge of the glass plate 10. The glass plate 10 is pressed against the adhesive tape 70, thereby adhering and fixing the glass plate 10 to the frame member 22. Although the adhesive tape 70 has been described as an example in this embodiment, other adhesive materials such as hot melt adhesives may be used. Although not shown, the other flange portions 21a, 23a, and 24a (see FIG. 2A) are also provided with strip-shaped adhesive tapes, which are adhered and fixed to the right edge, upper edge, and lower edge of the glass plate 10. The strip-shaped shape does not mean the thickness of the tape, and may be linear.

[0021] The waste glass door 5 thus constructed is cut together with the door frame 20 with a blade, for example, to separate the glass plate 10. As a method of separation, for example, the separation process described in Japanese Patent No. 7195234 can be used. However, the coating film 80 (see FIG. 2B), the adhesive tape 70, and the foam insulation material 50 (see FIG. 2B) remain attached to the surface (back surface) of the separated glass plate 10. In this state where the coating film 80, the adhesive tape 70, the foam insulation material 50 (insulation material), and the like remain on the glass plate 10, the glass plate cannot be reused, so it is necessary to remove the coating film 80, the adhesive tape 70, and the foam insulation material 50 remaining on the glass plate 10. Note that the glass plate 10 may be one without the coating film 80.

[0022] Fig. 3 is a diagram showing the state of the glass surface in the polishing process of the waste glass door. In Fig. 3, the state before being fed into the polishing device 40 is shown as glass sheet 10A, the state after being fed into the polishing device 40 is shown as glass sheet 10B, and the state after being fed into the glass surface polishing device 1 is shown as glass sheet 10C. The glass sheet 10A is in a state where the vacuum insulation material 30 (see Fig. 2B) has been removed or was not originally attached to the glass sheet 10.

[0023] As shown in the left diagram of Fig. 3, the glass plate 10A separated from the waste glass door 5 still has attachments such as the foam insulation material 50, adhesive tape 70, and coating film 80. That is, the coating film 80 remains on the front (rear) surface of the glass material 11, and the adhesive tape 70 and the foam insulation material 50 remain on the coating film 80. In the case of the glass plate 10A to which the coating film 80 is not applied, the adhesive tape 70 and the foam insulation material 50 remain directly on the rear surface of the glass plate 10A.

[0024] However, if the glass plate 10A with the foamed insulation material 50 attached thereto is fed into the glass surface polishing apparatus 1, urethane chips fly around inside the glass surface polishing apparatus 1 and adhere to the rollers of the conveying section 2. The urethane chips are compressed by the rollers of the conveying section 2, which makes the thickness of the rollers non-uniform and causes polishing unevenness. In addition, in order to suppress the polishing unevenness, the frequency of maintenance for removing the urethane attached to the rollers increases. For this reason, by providing a polishing device 40 in the front stage of the glass surface polishing apparatus 1 and performing a pre-process of polishing (removing) the urethane, the amount of urethane polished in the glass surface polishing apparatus 1 can be reduced. This makes it possible to reduce the amount of urethane fed into the glass surface polishing apparatus 1, and to suppress an increase in the number of maintenance operations. The foamed insulation material 50 (foamed urethane) attached and accumulated on the glass plate 10A is usually expected to have an uneven thickness and be uneven, although this depends on the method of separation from the waste glass door 5. At least the convex portion is expected to be taller than the coating film 80 and the adhesive tape 70, that is, to protrude toward the front side of the paper in Fig. 3. As will be described later, the polishing device 40 can reduce the amount of urethane polishing by the glass surface polishing device 1 in the subsequent stage by removing at least the portions of the foamed insulation material 50 that are relatively thick (tall) in this way.

[0025] As shown in the center diagram of Fig. 3, glass plate 10A fed into polishing device 40 becomes glass plate 10B in a state where foamed insulating material 50 has been at least partially removed. For ease of explanation, foamed insulating material 50 is not shown in the center diagram of Fig. 3. This glass plate 10B is in a state where coating film 80 remains on the surface of glass material 11, and adhesive tape 70 (adhesive material) remains on coating film 80.

[0026] Then, the glass plate 10B on which the coating film 80 and the adhesive tape 70 remain is fed into the glass surface polishing apparatus 1. As a result, as shown in the right diagram of Fig. 3, the coating film 80 and the adhesive tape 70 are removed from the glass plate 10B, resulting in a glass plate 10C (only the transparent glass material 11).

[0027] FIG. 4A is a configuration diagram of a glass surface polishing apparatus. As shown in Fig. 4A, the glass surface polishing apparatus 1 is configured to include rotating brushes 1A, 1B, and 1C, a conveying section 2 (conveying means) that conveys the glass plate 10, and an angle guiding jig 6 that guides the orientation (angle at which the glass plate 10 is conveyed) of the glass plate 10. Note that in Fig. 4A, the conveying section 2 is shown in a belt conveyor shape, unlike in Fig. 1.

[0028] The rotating brushes 1A, 1B, and 1C are disposed at equal intervals along the conveying direction S1 of the conveying section 2. The rotating brushes 1A to 1C are disposed such that the rotation axes 1g of the rotating brushes 1A to 1C are in a direction that is not parallel to the conveying direction S1, for example, perpendicular to the conveying direction S1. The rotation axes 1g of the rotating brushes 1A to 1C are all parallel to each other. An electric motor (not shown) is connected to each of the rotation axes 1g of the rotating brushes 1A to 1C, and a driving force is applied to rotate the rotating brushes 1A to 1C. The rotating direction W of the rotating brushes 1A to 1C is the same for all of them, which is the clockwise direction (W direction) shown in FIG. 1.

[0029] The angle guiding jig 6 is disposed near the conveying section 2 and includes a contact portion 6a that contacts one side (short side 10b) of the four sides (two long sides 10a and two short sides 10b) of the glass plate 10. The worker manually contacts the short side 10b of the glass plate 10 with the contact portion 6a, tilting the glass plate 10 with respect to the conveying direction S1. Then, while maintaining the orientation of the glass plate 10, the glass plate 10 is fed into the conveying section 2 (the glass plate 10 is placed on the conveying section 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 conveying direction S1 of the glass plate 10 is θ°. That is, the glass plate 10 is fed into the glass surface polishing apparatus 1 in a state inclined with respect to the conveying direction S1 of the glass plate 10. Note that, in this embodiment, the extending direction S2 of the adhesive tape 70 is described as being along the long side 10a of the glass plate 10. In addition, since the contact portion 6a is merely for guiding the insertion angle of the glass plate 10, it can be used for a glass plate 10 on which the adhesive tape 70 is attached along the edge of the glass plate 10. In addition, the angle θ is set to be equal to or greater than 10° and equal to or less than 30° (10 to 30°).

[0030] In the glass surface polishing device 1 configured as described above, the adhesive tape 70 forms an angle θ° with respect to the conveying direction S1, so that the adhesive tape 70 is prevented from continuously hitting the same place of the rotating brushes 1A to 1C. In the glass plate 10 of this embodiment, the adhesive tape 70 is attached in a direction along each of the short side direction and the long side direction of the rectangular glass plate 10, so that as a result, not only the short side direction but also the long side direction of the glass plate 10 is fed at an angle inclined (non-parallel angle) with respect to the conveying direction S1. While being conveyed by the conveying unit 2, the glass plate 10 is first polished by the rotating brush 1A. At this time, the adhesive tape 70 provided in the extending direction S2, the adhesive tape 70 located at point P1 passes through point P10 of the rotating brush 1A. Also, the adhesive tape 70 located at point P2 passes through point P20 of the rotating brush 1A. In this way, the adhesive tape 70, which is an example of an adhesive that can cause soiling of the rotating brush 1A, does not continue to pass over the same position on the rotating brush 1A, and this can prevent the rotating brush 1A from deteriorating quickly. In other words, it is possible to prevent the adhesive material from continuing to come into contact with the same part of the rotating brush 1A, and to prevent the brush surface from being unevenly covered with the adhesive or contaminated.

[0031] In addition, as for the adhesive tape 70 provided in the short-side direction (direction perpendicular to the extending direction S2) of the glass plate 10, 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 is inclined with respect to the conveying direction S1 of the glass plate 10, and the glass plate 10 is fed in with this inclined state. For this reason, as with the adhesive tape 70 provided in the extending direction S2, the adhesive tape 70 does not continue to pass through the same position on the rotating brush 1A, so that the deterioration of the rotating brush 1A can be prevented from accelerating. Since the rectangular adhesive tape 70 along the edge of the glass plate 10 is often provided on the waste glass door 5 of a refrigerator, the work is performed so that the glass plate 10 is fed in a direction corresponding to such a case. For example, when a rectangular glass plate 10 to which the adhesive tape 70 is attached in the diagonal direction is to be processed, the conveying direction S1 can be made parallel to the long-side direction or the short-side direction of the glass plate 10. In other words, the conveying direction S1 may be processed so that it is not parallel to the adhesive tape 70. It is preferable that all of the adhesive tapes 70 are non-parallel to the conveying direction S1, but if this is difficult, it is preferable that any of the adhesive tapes 70 other than the shortest adhesive tape 70 is non-parallel to the conveying direction S1, and it is even more preferable that the longest adhesive tape 70 is non-parallel to the conveying direction S1.

[0032] Then, before the rotating brush 1A has finished polishing the entire glass plate 10, the next rotating brush 1B starts polishing. In this case, as in the case of polishing with the rotating brush 1A, the orientation of the glass plate 10 is maintained, so that the adhesive tape 70 does not continue to pass over the same position on the rotating brush 1B, and the deterioration of the rotating brush 1B can be prevented from accelerating.

[0033] Then, before the entire glass plate has been polished by the rotating brush 1B, the next rotating brush 1C starts polishing. In this case, as in the polishing by the rotating brushes 1A and 1B, the orientation of the glass plate 10 is maintained, so that the adhesive tape 70 does not continue to pass over the same position on the rotating brush 1B, and the deterioration of the rotating brush 1B can be prevented from accelerating.

[0034] In this manner, a post-process is performed in which the adhesive tape 70 is removed. The adhesive tape 70 and the coating film 80 attached to the glass plate 10 are removed, and the glass plate is discharged from the glass surface polishing apparatus 1 as a transparent glass plate.

[0035] 1, the rotation direction of the rotating brushes 1A to 1C is set so that the brush surfaces come into contact with the glass plate 10 from the direction opposite to the conveying direction S1 of the glass plate 10. This improves the performance of removing the adhesive tape 70 and the coating film 80 from the glass plate 10. In this manner, the step of tilting the glass plate 10 at the angle θ° with respect to the conveying direction S1, i.e., with respect to the rotating brushes 1A to 1C, may be performed further upstream, for example, when the glass plate 10 is introduced into the conveying means 42, as long as the orientation of the glass plate 10 is generally maintained.

[0036] FIG. 4B is a diagram showing another configuration of the glass surface polishing apparatus. As shown in FIG. 4B, the glass surface polishing device 1 includes an angle guide means 7 for guiding the glass plate 10 in an inclined state. The angle guide means 7 is configured by forming an input instruction line 7a (indication line) on the belt surface of the belt conveyor as the conveying section 2, which indicates the orientation of the glass plate 10. The worker manually aligns the short side 10b of the glass plate 10 with the input instruction line 7a, and then inputs the glass plate 10 onto the conveying section 2. This method makes it possible to make the angle appropriate without using a jig, improving the workability of the input worker. In addition to this, an instruction line may be projected near the input port using a laser or an irradiation device. In addition, a method may be used in which a camera is prepared to capture the input glass plate 10, the camera image is recognized to determine the input angle of the adhesive tape 70, and an alarm is issued if the angle is inappropriate. In addition, by forming the input instruction lines 7a at regular intervals, it is possible to prevent the glass plate 10 from being input too much, and even an inexperienced worker can grasp the appropriate guideline for input.

[0037] 4A and 4B, and may be configured to grasp and change the orientation of the glass plate 10 using a robot hand by performing image recognition of the extending direction of the adhesive tape 70 instead of manual operation. Also, without providing auxiliary means such as the angle guiding jig 6 and the input instruction line 7a, an operator may visually adjust the conveying direction S1 so that it is non-parallel to the extending direction of the adhesive tape 70.

[0038] 5 is a cross-sectional view showing the distance between the rotating brush and the glass plate. Note that the polishing device 40 is set to a shallow positional relationship that allows the rotating brush 41 to remove the foam insulating material 50 remaining on the glass plate 10. As shown in FIG. 5, the distance between the rotation center O1 of the rotating brush 1A and the surface 10s of the glass plate 10 is R1. The distance between the rotation center O2 of the rotating brush 1B and the surface 10s of the glass plate 10 is R2. The distance between the rotation center O3 of the rotating brush 1C and the surface 10s of the glass plate 10 is R3. At this time, the distance between the rotating brushes 1A to 1C and the surface 10s of the glass plate 10 is set so that the relationship R1 ≧ R2 ≧ R3 is satisfied. This makes it possible to prevent the rotating brushes 1A to 1C from being subjected to an excessive load, and to improve the performance of removing the adhesive tape 70 and the coating film 80 on 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, this relationship applies when the diameters of the rotating brushes 1A, 1B, 1C, and 41 are the same. In a more general sense, the distances between the brush tips of the rotating brushes 1A, 1B, 1C, and 41 and the surface 10s can be set as R1, R2, R3, and R0, respectively.

[0039] In addition, the brush tip of the rotating brush 41 is preferably arranged so that it can contact and remove the foamed insulating material 50, but does not reach the surface 10s. The thickness of the foamed insulating material 50 is not uniform even on one glass plate 10, and is uneven and has thickness unevenness. In addition, the thickness of the foamed insulating material 50 often remains in a portion 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 insulating material 50 as it is, or with a large thickness unevenness, a lot of urethane debris adheres 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, the rotating brush 41 is provided that can remove at least a part of the foamed insulating material 50 and make the thickness uniform before processing with the rotating brushes 1A to 1C that reach the surface 10s, so that the amount of urethane debris adhering to the glass surface polishing device 1 can be reduced while the uneven adhesion can also be reduced.

[0040] As another means for reducing the amount of urethane processed by the glass surface polishing apparatus 1, a pre-process may be performed in which the foamed insulation material 50 is manually peeled off by an operator instead of using the polishing apparatus 40. The foamed insulation material 50 accumulated on the glass plate 10 is thicker and has relatively weaker adhesion than the adhesive tape 70, etc., and therefore can be removed to some extent by bare hands or a scraper, for example.

[0041] 6 is a diagram showing the polishing results when the input angle of the glass plate is changed. Note that the glass input angle is the input angle of the glass plate 10, and corresponds to the angle θ shown in FIG. 4A. As shown in FIG. 6, when the glass insertion angle was 45°, the adhesive tape 70 could be removed, but the coating film 80 remained in the center of the glass plate 10 and was judged as × (bad). When the glass insertion angle was 30°, the adhesive tape 70 and the coating film 80 could be removed, and the result was ◯ (good). When the glass insertion angle was 20°, the adhesive tape 70 and the coating film 80 could be removed, and the result was ◯ (good). Thus, the results showed that the adhesive tape 70 and the coating film 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] FIG. 7 is a graph showing the relationship between the rotation speed of the rotating brush and the glass surface temperature. In FIG. 7, the graph without hatching is when the rotation speed of the rotating brush is 1800 rpm, and the graph with hatching is when the rotation speed of the rotating brush is 1440 rpm. Also, the 1st pass on the horizontal axis is the surface temperature of the glass sheet 10 when polished with the first rotating brush of the glass surface polishing device 1, and the 2nd pass is the surface temperature of the glass sheet 10 when polished with the second rotating brush. Also, when the rotation speed of the rotating brush is 1800 rpm, up to 2 passes are allowed, and when the rotation speed of the rotating brush is 1440 rpm, 3 passes are allowed. Also, the graph shows the variation (error range) of the glass surface temperature.

[0043] As shown in FIG. 7, when the rotation speed of the rotating brush is 1800 rpm (when the rotation speed is high), the glass surface temperature rises in the second pass. At this time, the coating film 80 and the adhesive tape 70 are burned, and the glass plate 10 is discolored. In the environment of the present inventors, ester-based components and paraffin-based hydrocarbons were detected from the discolored parts, so that it is considered that the components of urethane and adhesive are the cause of the discoloration. Therefore, in this embodiment, the process is divided into three passes (rotating brushes 1A to 1C) and the rotation speed is reduced from 1800 rpm to 1440 rpm, thereby suppressing the temperature rise of the glass plate 10 and preventing discoloration. 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 increase in the glass surface temperature can be suppressed. In addition, by reducing the rotation speed of the rotating brushes 1A to 1C, noise and vibration can be suppressed, and the working environment can be improved and energy can be saved.

[0044] As described above, the processing method of this embodiment is a processing method for glass plate 10 to which adhesive tape 70, coating film 80 and foam insulation material 50 are attached, which is taken out from discarded glass door 5 of a refrigerator, and includes a preparation step of preparing glass surface polishing device 1 for polishing the surface of glass plate 10, a pre-step of removing at least a part of foam insulation material 50 from glass plate 10, and a post-step of polishing glass plate 10 with glass surface polishing device 1 to remove at least adhesive tape and coating film 80, in this order. This can reduce the amount of urethane (foam insulation material 50) polished by glass surface polishing device 1, and can suppress an increase in the frequency of maintenance of glass surface polishing device 1 while preventing uneven polishing by glass surface polishing device 1.

[0045] Moreover, in the processing method of this embodiment, the glass surface polishing apparatus 1 includes rotating brushes 1A-1C for polishing the glass plate 10, and a transport unit 2 for transporting the glass plate 10 toward the rotating brushes 1A-1C. The adhesive tape 70 is an adhesive material extending in a strip shape along the surface of the glass plate 10. The rotating brushes 1A-1C polish the glass plate 10 in a state in which the extending direction S2 of the adhesive material is inclined with respect to the transport direction S1 of the transport unit 2. This prevents the adhesive tape 70 from continuously contacting the same place of the rotating brushes 1A-1C, thereby preventing accelerated deterioration of the rotating brush 1A.

[0046] Moreover, in the processing method of this embodiment, the glass plate 10 has a plurality of adhesive tapes 70 extending in different directions, and the glass plate 10 is fed into the conveying section 2 in a state in which at least one of the adhesive tapes 70 that is not the shortest (longitudinal adhesive material) is inclined with respect to the conveying direction S1 of the conveying section 2. This makes it possible to prevent the adhesive tape 70 remaining on the glass plate 10 from continuously hitting the same portion of the rotating brushes 1A-1C, thereby preventing accelerated deterioration of the rotating brushes 1A-1C.

[0047] In the processing method of the present embodiment, the inclination angle θ of the adhesive tape 70 with respect to the transport direction S1 is 10 to 30°. This can improve the performance of removing the adhesive tape 70 and the coating film 80.

[0048] Furthermore, the polishing device of this embodiment has a rotating brush 41 that is used in the pre-process and not used in the post-process. By using a rotating brush 41 that is different from the rotating brushes 1A to 1C, the rotating brush 41 can be set at a shallow position that allows the foamed insulating material 50 remaining on the glass plate 10 to be removed.

[0049] In the polishing device of this embodiment, the rotating brush 41 is disposed at a position that does not reach the surface of the glass plate 10. This makes it possible to remove at least a portion of the foamed insulating material 50 and to make the thickness uniform.

[0050] Moreover, the glass surface polishing apparatus of the present embodiment includes an angle guiding jig 6 that guides the orientation of the adhesive tape 70 before it is inserted. This makes it easy 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-1C are arranged at intervals along the conveying direction S1 of the glass plate 10, and the rotation speed of each of the rotating brushes 1A-1C is 1450 rpm or less. By increasing the number of rotating brushes 1A-1C, the rotation speed of each of the rotating brushes 1A-1C can be lowered, and discoloration due to seizure of the glass plate 10 can be prevented. The number of rotating brushes 1A-1C is not limited to three, and may be four or more.

[0052] The processing system of this embodiment is a processing system for glass plate 10 having adhesive tape 70, coating film 80 and foam insulation material 50 attached thereto, which is taken out from discarded glass door 5 of a refrigerator, and includes polishing device 40 having rotating brush 41 for performing a pre-process of removing at least a part of foam insulation material 50 from glass plate 10, and glass surface polishing device 1 disposed downstream of said polishing device for performing a post-process of polishing the surface of glass plate 10 to remove at least the adhesive tape and coating film 80. This can reduce the amount of urethane (foam insulation material 50) polished by glass surface polishing device 1, and can suppress an increase in the frequency of maintenance of glass surface polishing device 1 while preventing uneven polishing by glass surface polishing device 1.

[0053] The present invention is not limited to the above-described embodiment, and includes various modified examples. For example, in the present embodiment, the adhesive tape 70 is provided along the four sides of the glass plate 10, but the adhesive tape 70 may be arranged diagonally on the glass plate 10. In this case, too, by inserting the glass plate 10 perpendicular to the axial direction without tilting it, the adhesive tape 70 does not keep hitting the same part of the rotating brush, and therefore the deterioration of the rotating brush can be prevented from accelerating. [Explanation of symbols]

[0054] 1. Glass surface polishing equipment 1A, 1B, 1C Rotating brush 2. Conveying section (conveying means) 3. Conveyor belt 5. Discarded glass door 6 Angle guide jig (angle guide means) 7a Input instruction line (instruction line) 10 Glass Plate 40 Polishing device (urethane polishing device) 41 Rotating brush (Rotating brush not used in post-processing) 50 Foam insulation (insulation, urethane foam) 70 Adhesive tape (adhesive material, backing material) 80 Coating (back surface attachment) G-axis direction S1 Transport direction S2 extension direction θ angle (tilt angle)

Claims

1. A method for treating a glass plate having a back surface attachment and a foam insulation material attached thereto, which is removed from a discarded glass door of a refrigerator, comprising the steps of: a preparation step of preparing a glass surface polishing device for polishing the surface of the glass plate; a preliminary step of removing at least a portion of the foam insulation from the glass sheet; a post-processing step of polishing the glass plate with the glass surface polishing apparatus and removing at least the back surface deposit, in this order.

2. 2. The method of claim 1 , further comprising: The glass surface polishing apparatus includes: A rotating brush for polishing the glass plate; a conveying means for conveying the glass plate toward the rotating brush, the back surface attachment is an adhesive material extending in a band shape along the front surface of the glass plate, The method includes polishing the glass plate with the rotating brush while the extending direction of the adhesive material is inclined with respect to the conveying direction of the conveying means.

3. 3. The method of claim 2, further comprising: The glass plate has a plurality of the adhesive materials extending in different directions from each other, The glass plate is fed into the conveying means in a state in which at least one of the adhesive materials that is not the shortest is inclined with respect to a conveying direction of the conveying means.

4. 3. The method of claim 2, further comprising: The inclination angle of the adhesive material with respect to the conveying direction is 10 to 30 degrees.

5. A polishing apparatus for use in the processing method according to any one of claims 1 to 4, comprising: a polishing device having a rotating brush which is used in the pre-process and not used in the post-process;

6. 6. The polishing apparatus according to claim 5, The polishing device has a rotating brush disposed at a position that does not reach the surface of the glass plate.

7. The glass surface polishing apparatus used in the processing method according to any one of claims 2 to 4, A glass surface polishing apparatus comprising an angle guiding means for guiding the direction of the adhesive material before it is inserted.

8. The glass surface polishing apparatus used in the processing method according to any one of claims 2 to 4, The rotating brush includes three or more brushes arranged at intervals along the conveying direction of the glass sheet, A glass surface polishing apparatus, wherein the rotation speed of each of the rotating brushes is 1450 rpm or less.

9. A processing system for a glass plate having a back surface attachment and a foam insulation material attached thereto, which is removed from a waste glass door of a refrigerator, comprising: a polishing device having a rotating brush for performing a pre-processing step of removing at least a portion of the foam insulation from the glass plate; a glass surface polishing apparatus disposed downstream of the polishing apparatus, for performing a post-process of polishing the surface of the glass plate and removing at least the back surface deposits.

Images