JP2023082988A - Method for manufacturing glass plate and glass original plate package - Google Patents

Abstract

To suppress harm caused by glass powder generated in a plurality of cutting steps to improve the quality of a glass plate obtained from a glass original plate as a product.SOLUTION: A method for manufacturing a glass plate comprises: the molding step A of molding a glass ribbon GR; the first cutting step B of cutting a glass original plate G1 by scribe cutting in the width direction from the molded glass ribbon GR; the second cutting step C of holding the glass original plate G1 subjected to the first cutting step B in the vertical posture to remove both ends of the glass original plate G1 in the width direction by scribe cutting in the vertical direction; and the step of cutting a glass plate g from the glass original plate G2 subjected to the second cutting step C. A scribe line is formed on non-guaranteed surface 3 of the glass original plate in at least one of the first cutting step B and the second cutting step C.SELECTED DRAWING: Figure 1

Description

The present invention provides a method for manufacturing a glass plate, which includes a step of scribing a glass ribbon formed by a down-draw method to obtain a glass base plate that is the basis of a glass plate, and a glass base plate obtained by the scribing. It relates to a glass original plate package packed with

As is well known, as a method for manufacturing a glass plate, a method using a down-draw method represented by an overflow down-draw method, a slot down-draw method and a redraw method is widely adopted. An example of the glass plate manufacturing process using the overflow down-draw method in this technique is as follows. In addition, what is illustrated below is a manufacturing process of a glass plate suitably used as a glass substrate or a cover glass for displays such as a liquid crystal display and an organic EL display, for example.

First, in this type of manufacturing process, as disclosed in Patent Document 1, a forming step of forming a glass ribbon, and a first cutting step (X cutting step) of cutting out a glass raw plate from the formed glass ribbon by scribe cutting. ) and

In the forming step, the molten glass is supplied to an overflow groove provided at the top of the wedge-shaped formed body and allowed to overflow. After flowing down the overflowing molten glass along the side surface of the molded body, they are fused and integrated at the lower end of the molded body. This forms a plate-like glass ribbon. After that, the formed glass ribbon is drawn downward while being sandwiched from both the front and back sides by pairs of rollers arranged in a plurality of upper and lower stages. Ear portions having a greater thickness than the center portion in the width direction are formed at both width direction end portions of the glass ribbon thus obtained.

In the scribing cutting performed in the first cutting step, a scribe line is formed along the width direction on the main surface of the glass ribbon conveyed downward, and the peripheral region of the scribe line is curved to apply a bending stress to the scribe line. The glass ribbon is cut along the When performing this scribe cutting, the glass ribbon is curved so that the main surface side on which the scribe line is formed becomes convex.

Next, in this type of manufacturing process, as disclosed in Patent Document 2, a second cutting step (Y cutting process).

In the scribing cutting performed in the second cutting step, a scribe line is formed along the longitudinal direction on the main surface of the glass ribbon held in a vertical position on the width direction end side, and the peripheral area of the scribe line is curved and bent. The glass ribbon is cut along the scribe line by applying stress. Also when this scribe cutting is performed, the glass ribbon is curved so that the main surface side on which the scribe line is formed is convex. This scribing cutting is separately performed on one end side and the other end side in the width direction of the original glass plate. As a result, a glass base plate having no selvages at both ends in the width direction is obtained.

After that, in a predetermined post-process, a glass sheet of a predetermined size is obtained by scribe cutting or the like from the above-mentioned original glass sheet having no lugs.

JP 2017-202958 A JP 2017-226549 A

By the way, when scribe cutting is performed in the first cutting step and the second cutting step described above, glass powder scatters. This glass powder is likely to scatter on the main surface side of the original glass plate where the scribe lines are formed, and a considerable amount of the scattered glass powder adheres to the main surface.

One principal surface of the original glass plate is a guaranteed surface, and the other principal surface is a non-guaranteed surface. Here, the guaranteed surface is a surface on which an element or the like is formed and whose surface properties are guaranteed. On the positive side. Therefore, if glass powder adheres to the guaranteed surface of the original glass plate, the glass powder may damage the guaranteed surface, or part of the glass powder may not be removed in the washing process and may remain on the product. As a result, the quality of the glass plate deteriorates.

From the above viewpoints, the object of the present invention is to provide glass powder generated in the first cutting step of cutting out the glass raw plate from the glass ribbon formed by the down-draw method and the second cutting step of removing the width direction both ends of the glass raw plate. An object of the present invention is to improve the quality of a glass plate as a product obtained from a glass base plate by suppressing the adverse effects caused by this.

A first aspect of the present invention, which has been devised to solve the above problems, is a forming step of forming a glass ribbon by a down-draw method, and a glass ribbon by scribing cutting along the width direction from the glass ribbon formed in the forming step. A first cutting step of cutting out the original plate, and a second cutting step of holding the glass original plate that has undergone the first cutting step in a vertical position and removing both ends in the width direction of the glass original plate by scribing along the vertical direction. , wherein a glass plate is obtained from the original glass plate that has undergone the second cutting step, wherein at least one of the first cutting step and the second cutting step includes: It is characterized by forming a scribe line on the non-guaranteed surface of the guaranteed surface, which is the surface, and the non-guaranteed surface, which is the other major surface.

According to such a configuration, a scribe line is formed on the non-guaranteed surface of the original glass plate in at least one of the first cutting step and the second cutting step. Adhesion of the glass powder to the security surface is suppressed. For this reason, it is possible to reduce damage to the guarantee surface by the glass powder, and to reduce the possibility that part of the glass powder adhering to the guarantee surface cannot be removed in the cleaning process and remains. As a result, the quality of the glass plate as a product obtained from the original glass plate can be improved.

In this configuration, scribe lines may be formed on the non-guaranteed surface of the glass substrate in both the first cutting step and the second cutting step.

By doing so, it is possible to reliably suppress the adhesion of glass powder to the guaranteed surface of the original glass plate when scribing is performed in the above two cutting steps, thereby significantly improving the quality of the glass plate as a product.

The above configuration further comprises a storage step of stacking and storing the original glass plate and the protective sheet that have undergone the second cutting step alternately on a pallet in a vertical posture, and in the storage step, the security surface of the original glass plate is removed. , may be supported by a back support provided on the pallet.

In this way, the guaranteed surface of the original glass plate is located on the back support side of the pallet, and the non-secured surface is located on the opposite side. Here, when stacking the original glass plate and the protective sheet on the pallet in order, the corner between the security surface and the lower end surface (cut surface) of the original glass plate to be loaded should be It may contact the non-guaranteed surface of the glass original plate in the front row (see later-described FIG. 8). If this abutment or the like occurs, there is a risk that the non-guaranteed side of the loaded glass base plate will be scratched, but the guaranteed side will not be scratched and will be reliably protected. . Moreover, if there are scribe marks on the non-guaranteed surface side of the lower end surface of the glass original plate to be loaded, even if the above-mentioned contact or the like occurs, the corners where the scribe marks are formed may be damaged. No abutment or the like occurs. Here, the scribe mark is a trace of a scribe line left on the cut surface of the original glass plate. Since the scribe marks have many cracks, when the scribe marks come into contact with the non-guaranteed surface of the original glass plate, glass powder may be generated from the scribe marks or breakage may occur starting from the scribe marks. However, if the corner where the scribe mark is formed does not come into contact as described above, such a problem will not occur.

In this configuration, the storage step may include a transfer step of transferring the glass original plate and the protective sheet stacked on the pallet.

In this way, the original glass plate and the protective sheet stacked on the pallet can be effectively protected during transportation (transportation to another factory or the like, transportation within the same factory, etc.). That is, at the time of transfer, due to shaking, vibration, or the like, a shift in which the lower end surface of the original glass plate moves away from the back support portion (a displacement in which the inclination angle of the original glass plate with respect to the horizontal plane becomes smaller) may occur (see FIG. 10 described later). . When this deviation occurs, the corners between the guarantee surface of the original glass plate and the lower end face thereof rub against each other, or the pressure contact force acting on the corners increases. At this time, if scribe marks are present on the non-guaranteed surface side of the lower end surface of the glass substrate, the above-mentioned rubbing and pressure contact force increase cannot occur at the corners where the scribe marks are formed. It is possible to prevent the occurrence and damage of

In these configurations, the protective sheet may be a foamed resin sheet.

In this way, even if the glass powder adheres to the guaranteed surface or the non-guaranteed surface of the raw glass plate loaded on the pallet, the deformation of the foamed resin sheet reduces the force of pressing the glass powder against the raw glass plate. do. Therefore, it is possible to reduce damage or breakage of the original glass plate due to the glass powder in the storage process.

The above configuration further comprises a third cutting step of cutting out a glass plate by scribing from the original glass plate that has undergone the storage step, and a cleaning step of cleaning the glass plate that has undergone the third cutting step, In the third cutting step, a scribe line is formed on the guaranteed surface of the glass raw plate while the glass raw plate is laid flat and the non-guaranteed surface of the glass raw plate is supported from below. The glass plate may be washed in a state where the glass plate is laid flat and the non-guaranteed surface of the glass plate is supported from below.

In this manner, when the third cutting step and the cleaning step are performed, contact traces and stains are left on the non-guaranteed surfaces of the glass original plate and the glass plate in the flat posture due to contact with the support member that supports them from below. Although troubles such as sticking may occur, such troubles cannot occur in terms of those guarantees, so they are reliably protected. In addition, in the third cutting step, glass powder due to scribing adheres to the guaranteed surface of the cut glass plate, but the glass powder adhering to the guaranteed surface of the glass plate is removed as quickly as possible in the subsequent cleaning step. By doing so, it is possible to suppress damage to the security surface by the glass powder. Furthermore, since scribe marks are formed on the non-guaranteed surface side (lower side) of the end face of the original glass plate, the scribe marks may come into contact with the supporting member below. However, if the original glass plate is placed on the above protective sheet (for example, a foamed resin sheet) at this time, the shock-absorbing properties and elasticity of the glass plate reduce damage and breakage due to glass dust. On the other hand, as for the glass plate, since the scribe mark is formed on the guaranteed surface side (upper side) of the end face, it is impossible for the scribe mark to come into contact with the supporting member below.

This structure WHEREIN: You may further provide the processing process which processes the end surface of the said glass plate with a processing tool between the said 3rd cutting process and the said washing process.

Here, the scribe mark on the guaranteed surface side of the end surface of the glass plate has better straightness than the part on the non-guaranteed surface side of the end surface. Therefore, even if the end surface of the glass plate is processed by cutting, polishing, or the like, chipping or cracking is less likely to occur on the guaranteed surface side of the glass plate. Moreover, since the scribe mark on the glass plate is eliminated by this processing step, generation of glass powder and breakage can be prevented.

A second aspect of the present invention, which has been devised to solve the above problems, is a glass original plate laminate in which glass original plates and protective sheets are alternately laminated in a vertical posture, and a pallet on which the glass original plate laminate is loaded. , wherein both the end surfaces along the longitudinal direction and the end surfaces along the lateral direction of the original glass plate are cut surfaces by scribe cutting, and at least one of the end surfaces is the glass It is characterized by having scribe marks on the non-guaranteed side of the guaranteed side, which is one of the main surfaces of the original plate, and the non-guaranteed side, which is the other main surface.

According to such a configuration, since at least one of the end face along the longitudinal direction and the end face along the lateral direction of the original glass plate provided in the package has a scribe mark on the non-guaranteed surface side, the guaranteed surface of the original glass plate has a scribe mark. Adhesion of glass powder is suppressed. In addition, even if glass dust is generated from the scribe mark while the original glass plate is stored as a package, it is possible to suppress the problem that the glass dust affects the warranty.

In this configuration, both the end face along the longitudinal direction and the end face along the lateral direction of the original glass plate may have scribe marks on the non-guaranteed surface side.

In this way, adhesion of glass powder to the security surface of the glass substrate is reliably suppressed. In addition, it is possible to reliably prevent defects on the warranty surface caused by glass powder generated from scribe marks while the original glass plate is stored as a package.

In these configurations, the pallet includes a back surface supporting portion that supports the back surface of the glass original plate laminate, and a bottom surface support portion that supports the bottom surface of the glass original plate laminate, and the guarantee surface of the glass original plate is: It may be located on the side of the back support portion.

In this way, when the original glass plate and the protective sheet are sequentially stacked on the pallet, the corner between the security surface and the lower end surface (cut surface) of the original glass plate to be loaded is Even if it abuts against the non-guaranteed surface of the finished glass substrate, the guaranteed surface is reliably protected. Moreover, if the scribe mark exists on the non-guaranteed surface side of the lower end surface of the glass substrate, even if the above-mentioned contact or the like occurs, the corner portion where the scribe mark is formed will not cause contact or the like. , the generation and breakage of glass dust can be prevented.

According to the present invention, the adverse effects caused by the glass powder generated in the first cutting step of cutting out the glass base plate from the glass ribbon formed by the down-draw method and the second cutting step of removing both width direction end portions of the glass base plate are suppressed. , the quality of the glass plate as a product obtained from the original glass plate can be improved.

It is a flow chart which shows a manufacturing method of a glass plate concerning an embodiment of the present invention. It is a perspective view which illustrates the implementation situation of the formation process, the 1st cutting process, and the 2nd cutting process in the manufacturing method of the glass plate which concerns on embodiment of this invention. It is a side view which shows typically the implementation situation of the 1st cutting process in the manufacturing method of the glass plate which concerns on embodiment of this invention. 1 is a longitudinal side view showing a glass original plate cut out in a first cutting step in a method for manufacturing a glass plate according to an embodiment of the present invention; FIG. It is a top view which shows typically the implementation condition of the 2nd cutting process in the manufacturing method of the glass plate which concerns on embodiment of this invention. FIG. 4 is a cross-sectional plan view showing the glass original plate cut out in the second cutting step in the method for manufacturing a glass plate according to the embodiment of the present invention. It is a perspective view which illustrates the implementation situation of the storage process in the manufacturing method of the glass plate which concerns on embodiment of this invention. FIG. 4 is a partially enlarged vertical cross-sectional side view illustrating the state of implementation of a storage step in the method for manufacturing a glass plate according to the embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which illustrates the glass original plate package which concerns on embodiment of this invention. 1 is a partially enlarged longitudinal side view showing a main part of a glass original plate package according to an embodiment of the present invention; FIG. It is a perspective view which illustrates the implementation situation of the posture change process in the manufacturing method of the glass plate which concerns on embodiment of this invention. It is a perspective view which illustrates the implementation situation of the 3rd cutting process in the manufacturing method of the glass plate which concerns on embodiment of this invention. It is a perspective view which illustrates the implementation situation of a processing process, a washing process, an etching process, and a loading process in the manufacturing method of the glass plate which concerns on embodiment of this invention. FIG. 4 is a plan view showing a main part of the glass plate cut out in the third cutting step in the method for manufacturing the glass plate according to the embodiment of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION A method for manufacturing a glass plate and a glass original plate package according to embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the method for manufacturing a glass plate mainly includes a forming process A, a first cutting process B, a second cutting process C, a storage process D, an attitude changing process E, and a third A cutting process F, a processing process G, and a cleaning process H are provided. This glass plate manufacturing method relates to a glass plate used as a substrate or a cover for displays such as liquid crystal displays and organic EL displays. Hereinafter, the state of implementation of these steps A to H and the glass original plate package manufactured in the storage step D will be described. In addition, in the following description. The arrow X direction side shown in FIGS. 2 to 14 is the front side, and the arrow Y direction side is the rear side.

FIG. 2 is a perspective view illustrating the state of implementation of the forming process A, the first cutting process B, and the second cutting process C. FIG. The forming step A is a step of forming the glass ribbon GR from the molten glass GM. The first cutting step B is a step of cutting out the first glass original plate G1 from the glass ribbon GR formed in the forming step A by scribing along the width direction. The second cutting step C is a step of cutting out the second glass raw plate G2 by removing the width direction end portions Ga of the first glass raw plate G1 that has undergone the first cutting step B by scribing along the vertical direction.

More specifically, in the forming step A, the molten glass GM is supplied to the overflow groove 1a at the top of the wedge-shaped formed body 1 to overflow. The overflowing molten glass GM is made to flow down along the side surface of the molded body 1 and then fused and integrated at the lower end of the molded body 1 . This forms a plate-like glass ribbon. After that, the formed glass ribbon is drawn downward while being sandwiched from both the front and back sides by roller pairs (not shown) arranged in a plurality of upper and lower stages. A cooling roller pair is arranged on the uppermost stage of the roller pairs arranged in a plurality of upper and lower stages. Ear portions having a thickness larger than that of the center portion in the width direction are formed at both width direction end portions Ga of the drawn glass ribbon GR. The main surface 3 on the front side of the glass ribbon GR is a non-guaranteed surface, and the main surface 4 on the rear side is a guaranteed surface. Here, the guaranteed surface 4 is the surface on which elements and the like of the glass plate finally obtained from the glass ribbon GR are formed, and is the surface whose surface properties are guaranteed. , the surface properties need not be guaranteed to the extent of the guaranteed surface 4 . The thickness of the central portion in the width direction of the glass ribbon GR is 1000 μm or less, preferably 700 μm or less, and the lower limit thereof is, for example, 50 μm or more.

In the first cutting step B, first, the scribing wheel 5 moves from the position indicated by the chain line to the position indicated by the solid line while being pressed against the non-guaranteed surface 3 of the glass ribbon GR, thereby cutting the non-guaranteed surface 3 of the glass ribbon GR. A scribe line S1 is formed along the width direction. At this time, the region where the scribe line S1 is formed is supported by a supporting member (not shown) from the security surface 4 side, and the gripping mechanism 6 is not in operation. After the scribe line S1 is formed, the scribing wheel 5 and the support member are retracted to the retracted position. Although the scribe line S1 does not reach both edges in the width direction of the glass ribbon GR in the illustrated example, it may reach the both edges. Next, the gripping mechanism 6 gripping the lower end of the glass ribbon GR rotates in the direction of arrow a while the folding member 2x supports the formation region of the scribe line S1 from the security surface 3 side. The ribbon GR is folded along the scribe line S1. By this scribe cutting by folding, the first glass original plate G1 having ears at both ends Ga in the width direction is cut out. The scribing cutting is performed in a curved state so that the non-guaranteed surface 3 side of the glass ribbon GR is convex. When this scribe cutting is performed, as shown in FIG. 3, a large amount of glass powder GF scatters on the non-guaranteed surface 3 side of the first glass original plate G1. Therefore, a considerable amount of glass powder GF adheres to the non-guaranteed surface 3 of the first glass blank G1, but such a degree of glass powder GF does not adhere to the guaranteed surface 4.

As shown in FIG. 4, the upper end surface (cut surface) Pa of the cut first glass raw plate G1 has scribe marks Sx formed by the current scribing cutting, and the lower end surface (cut surface) is present. Pb has scribe marks Sx formed by the previous scribe cutting. These scribe traces Sx are traces of the scribe lines S1. Therefore, both scribe marks Sx are formed on the non-guaranteed surface 3 side of the upper end surface Pa and the lower end surface Pb.

Referring to FIG. 2, when performing the second cutting step C, the first glass original sheet G1 is suspended and supported in a vertical posture. In the second cutting step C, first, the two scribing wheels 7 form scribe lines S2 at predetermined positions (positions slightly inward of the ears in the width direction) of both width direction end portions Ga of the first glass substrate G1. Form. Specifically, the two scribing wheels 7 move from the position indicated by the dashed line to the position indicated by the solid line while pressing predetermined positions on the width direction end portions Ga of the non-guaranteed surface 3 of the first glass substrate G1. Two scribe lines S2 are formed along the longitudinal direction on the non-guaranteed surface 3 of the first glass substrate G1. In the illustrated example, the two scribe lines S2 do not reach the both edges in the vertical direction of the glass ribbon GR, but they may reach the both edges. In this case, the two scribe lines S2 may be formed simultaneously, or may be formed separately over time. Next, the first glass original sheet G1 is broken along the two scribe lines S2 while the security surface 4 side of the first glass original sheet G1 is supported by the two back support members 8 . Specifically, the width of the non-guaranteed surface 3 of the first glass substrate G1 is The first glass original plate G1 is broken by pushing the directional both end portions Ga toward the back side (guaranteed surface 4 side) with a pushing member (not shown). Width direction end portions Ga including ear portions of the first glass original plate G1 are removed by scribe cutting by folding at these two locations. As a result, the second glass substrate G2 having no lugs is obtained. In this case, the scribing and cutting at the two locations may be performed simultaneously, or may be performed separately over time. When the scribe cutting is performed at these two locations, as shown in FIG. 5, a large amount of glass powder GF scatters toward the non-guaranteed surface 3 side of the second glass substrate G2. Therefore, a considerable amount of glass powder GF adheres to the non-guaranteed surface 3 of the second glass blank G2 in addition to the glass powder adhered in the above-described first cutting step B. of glass powder GF does not adhere.

As shown in FIG. 6, scribe marks Sx formed by scribe cutting are present on both end surfaces (cut surfaces) Pc and Pd in the width direction of the second glass original plate G2. These scribe marks Sx are both formed on the non-guaranteed surface 3 side of the end faces Pc and Pd on both sides in the width direction.

FIG. 7 is a perspective view illustrating the implementation status of the storage process D. FIG. As shown in the figure, in the storage step D, the second glass substrate G2 cut out in the second cutting step C is stacked in a vertically suspended state on a pallet 10 alternately with the protective sheet 9. To go. Therefore, the second glass original sheet G2 about to be loaded on the pallet 10 is oriented along the vertical plane. On the other hand, the back supporting surface 11a of the back supporting portion 11 of the pallet 10 is formed as an inclined surface that inclines rearward as it moves upward. The inclination angle of the back support surface 11a with respect to the horizontal plane is, for example, 60° to 85°. Therefore, the glass original plate laminate 12 composed of the second glass original plate G2 and the protective sheet 9 already loaded on the pallet 10 is also in a vertical posture, but is inclined along the back support surface 11a. In this case, the second glass original sheet G2 is suspended and supported while being cut in the second cutting step C and loaded on the pallet 10, so the front main surface 3 of the second glass original sheet G2 is not guaranteed. The main surface 4 on the rear side is the security surface 4 . Although the protective sheet 9 is a foamed resin sheet in the present embodiment, it may be a non-foamable resin sheet or interleaving paper.

In such a situation, as shown in FIG. 8, when stacking the second glass substrate G2 and the protective sheet 9 on the pallet 10 in order, the second glass substrate G2 to be loaded must be guaranteed. The corner Px between the surface 4 and the lower end surface Pb may come into contact with the non-guaranteed surface 3 of the loaded second glass original plate G2 in the front row. In this case, after the abutment, the corner Px slides downward on the non-guaranteed surface 3, and the second glass original sheet G2 to be loaded assumes the above-described inclined posture. By performing such an operation, the non-guaranteed surface 3 of the loaded second glass substrate G2 in the front row may be damaged, but the guaranteed surface 4 may be damaged. No fear. Therefore, the security surface 4 is reliably protected. Moreover, since the scribe mark Sx exists on the non-guaranteed surface 3 side of the lower end surface Pb of the second glass raw plate G2 to be loaded, the scribe mark Sx is formed even if the above contact or sliding occurs. No contact or sliding occurs at the corner Py where the corner Py is formed. Here, since the scribe mark Sx has a large number of cracks, if contact or sliding occurs between the scribe mark Sx and the non-guaranteed surface 3 of the second glass original plate G2, the scribe mark Sx will break into glass powder. or breakage may occur starting from the scribe mark Sx. However, since contact and sliding as described above do not occur at the corner Py where the scribe mark Sx is formed, such a problem does not occur.

9 is a perspective view illustrating the glass original plate package Z produced in the storage step D. FIG. As shown in the figure, the glass original plate package Z includes a glass original plate laminate 12 in which a second glass original plate G2 and a protective sheet 9 are alternately laminated in a vertical posture (strictly speaking, the tilted posture described above), and a glass raw plate and a pallet 10 on which the laminate 12 is loaded. Furthermore, the glass original plate package Z also includes a packing tool such as a binding band Ba that prevents the glass original plate laminate 12 from collapsing or the like. The pallet 10 includes a back support portion 11 having the aforementioned inclined back support surface 11 a and a bottom support portion 13 that supports the bottom surface of the glass original plate laminate 12 . A bottom receiving surface 13a of the bottom support portion 13 is formed as an inclined surface that slopes upward as it moves forward. The inclination angle of the bottom receiving surface 13a with respect to the horizontal plane is, for example, 5° to 30°. Here, with reference to FIGS. 4, 6, and 8, all the second glass original sheets G2 in the glass original sheet laminate 12 have the front main surface 3 as the non-guaranteed surface and the rear main surface 3 as the non-guaranteed surface. Face 4 is the guaranteed face. In addition, all of the second glass substrates G2 have scribe marks Sx on the non-guaranteed surface 3 side of all four end faces Pa to Pd along the four sides.

The storage step D includes a transfer step of transferring the second glass original plate G2 and the protective sheet 9 stacked on the pallet 10 in the form of a glass original plate package Z. As shown in FIG. The transporting step is a step of transporting the glass original plate package Z to another factory or the like, or transporting it within the same factory. When the transfer process is carried out, due to shaking, vibration, or the like, as shown in FIG. 2, a shift in which the angle of inclination with respect to the horizontal plane of the original glass plate G2 becomes smaller) may occur. When this deviation occurs, the corner Px between the guarantee surface 4 of the second glass substrate G2 and the lower end surface Pb is rubbed, or the pressure contact force acting on the corner Px increases. do. However, since the scribe mark Sx is not formed on the corner Px, it is possible to prevent generation of glass powder and breakage due to the above-described rubbing and an increase in pressure contact force.

FIG. 11 is a perspective view illustrating the state of implementation of the posture changing process E. FIG. As shown in the figure, in the posture changing process E, first, the glass original plate package Z that has been manufactured in the storage process D and has undergone the transfer process is unpacked, and a second glass original plate G2 from the pallet 10 and one One set of protective sheets 9 is taken out one by one. A set of the second glass original plate G2 and the protective sheet 9 that have been taken out are transported toward the attitude change table 14 while being suspended and supported. During this transportation, the protective sheet 9 is arranged on the front side of the second original glass plate G2. The main surface 3 on the front side of the second glass substrate G2 is a non-guaranteed surface, and the main surface 4 on the rear side is a guaranteed surface. The second glass original plate G2 and the protective sheet 9 are conveyed in a direction orthogonal to both main surfaces 3 and 4 of the second glass original plate G2. In this case, it is preferable that the protective sheet 9 is superimposed on the front side of the second glass substrate G2 and conveyed by the same chuck member provided in the hanging device (not shown).

The attitude change table 14 has a support plate 15 and a receiving plate 16 . At the time when the second glass substrate G2 and the protective sheet 9 have been transported to the place where the attitude change table 14 is installed, the attitude change table 14 is in the state indicated by the dashed line in FIG. The mounting surface 15a of the support plate 15 in this state is an inclined surface that inclines forward as it moves upward. The inclination angle of the mounting surface 15a with respect to the horizontal plane is, for example, 60° to 85°. Further, the receiving surface 16a of the receiving plate 16 in this state is an inclined surface that slopes upward as it shifts to the rear side. The inclination angle of the receiving surface 16a with respect to the horizontal plane is, for example, 5° to 30°. The conveyed second glass original plate G2 and protective sheet 9 are placed on the attitude change table 14 in the state indicated by the dashed line. At this point, the front surface 9 a of the protective sheet 9 contacts the mounting surface 15 a of the support plate 15 , and the non-guaranteed surface 3 of the second original glass plate G 2 contacts the rear surface 9 b of the protective sheet 9 . After that, the attitude change table 14 rotates in the direction of the arrow b, and changes from the state indicated by the dashed line to the state indicated by the solid line. As a result, the second glass original plate G2 and the protective sheet 9 are placed in a flat posture. Specifically, the protective sheet 9 is laid flat on the mounting surface 15 a of the support plate 15 , and the second glass original plate G 2 is mounted on the protective sheet 9 . At this time, the main surface 4 on the upper side of the second glass substrate G2 becomes the guaranteed surface. The second glass substrate G2 and the protective sheet 9 are sent out from the attitude change table 14 while maintaining this flat attitude. After that, the attitude change table 14 rotates in the direction of the arrow c and returns to the original state (the state indicated by the dashed line). In this state, the subsequent second glass original plate G2 and protective sheet 9 taken out from the pallet 10 and conveyed are placed on the attitude change table 14, and the same operations as described above are repeatedly performed. Note that the posture changing table 14 may not have the receiving plate 16, but in this case, the receiving plate 16 is preferably configured so as to be able to hold the second glass original plate G2 and the protective sheet 9 by adsorption or the like.

FIG. 12 is a perspective view illustrating the state of implementation of the third cutting step F. FIG. As shown in the figure, in the third cutting process F, first, on the guarantee surface 4 of the second glass original plate G2 which has been sent out from the attitude change table 14 and reached the support table 17 in the flat posture, A total of four scribe lines S4 are formed by a scribe wheel (not shown) or the like. Among them, the two scribe lines S4 along the longitudinal direction (front-rear direction) are formed at positions slightly spaced inward from the two end faces Pa and Pb along the longitudinal direction, and are perpendicular to the lateral direction ( The two scribe lines S4 along the lateral direction) are formed at positions separated inward by a small distance from the two end faces Pc and Pd along the lateral direction. The second glass original plate G2 is placed on the support table 17 with the non-guaranteed surface 3 in contact with the upper surface 9b of the protective sheet 9 in the flat position. In this state, the second glass substrate G2 and the protective sheet 9 are delivered from the support table 17 and transported by a conveyor (not shown). In the process of this transportation, a folding member (not shown) pushes up the formation area of each scribe line S4 of the second glass original plate G2 from below the protective sheet 9, so that the second glass original plate G2 is aligned with each scribe line S4. fold along. By scribe cutting by folding at four locations, four unnecessary portions Gz are removed from the second glass original plate G2, and a glass plate g having a desired size is cut out. In addition, in the third cutting step F, a plurality of glass plates g having desired dimensions may be cut out from one second glass original plate G2. Also, the removal of the four unnecessary parts Gz by folding and breaking need not be performed at the same time. For example, after forming two scribe lines S4 and removing the two unnecessary parts Gz, the remaining scribe lines S4 are removed. After forming, the remaining unnecessary portion Gz may be removed.

In the third cutting step F, the non-guaranteed surface 3 comes into contact with the upper surface of the support base 17 and the conveyor through the protective sheet 9 when the second glass raw plate G2 is delivered or conveyed. Therefore, although the non-guaranteed surface 3 of the second glass substrate G2 is easily damaged, the guaranteed surface 4 does not suffer from such defects and is reliably protected. Furthermore, since the second glass substrate G2 has the scribe mark Sx on the non-guaranteed surface 3 side (lower side) of each of the end faces Pa to Pd, when the scribe mark Sx contacts the upper surface of the support table 17 or the conveyor, may lead to the generation of glass dust and breakage. However, since the second original glass plate G2 is placed on the protective sheet 9 (foamed resin sheet), the shock-absorbing properties and elasticity of the foamed resin sheet 9 make such problems less likely to occur. Also, when the cut glass sheet g is transported, its non-protected surface 3 comes into contact with the upper surface of the support base 17 and the conveyor through the protective sheet 9, so that the protected surface 4 is reliably protected. Furthermore, since the glass plate g has scribe marks Sx formed on the side of the protection surface 4 (upper side) on each of the end faces pa to pd, it is impossible for the scribe marks Sx to come into contact with the conveyor.

In addition, in this third cutting step F, glass powder due to scribing adheres to the security surface 4 of the glass plate g. However, since the cleaning treatment to be described later is performed as soon as possible after cutting the glass plate g, in other words, the treatment to be applied to the glass plate g from the cutting of the glass plate g to the cleaning treatment to be described later is performed as quickly as possible. Since it is reduced, it is possible to suppress damage to the security surface 4 by the glass powder adhering to the security surface 4 of the glass plate g.

13A and 13B are perspective views illustrating the implementation status of the processing process G, the cleaning process H, the drying process J, and the loading process K. FIG. As shown in the figure, in the processing step G, the end faces pa to pd of the glass plate g cut out in the third cutting step F are ground and polished using a grinding wheel 18 and a polishing wheel 19. During the grinding and polishing processes, the glass plate g is held on a surface plate (not shown) and carried in and out of the surface plate by a conveyor (not shown). Also in this processing step G, the upper principal surface 4 of the glass plate g is the guaranteed surface, and the lower principal surface 3 is the non-guaranteed surface. Moreover, the protective sheet 9 is excluded between the third cutting step F and the processing step G. The four end faces pa to pd of the glass plate g are ground and polished by a technique such as changing the orientation of the glass plate g by 90° in plan view. In this case, each of the end faces pa to pd of the glass plate g before being subjected to the grinding process and the polishing process has a scribe mark Sx formed on the guarantee surface 4 side in the plan view shown in FIG. The straightness is good in the part on the guarantee surface 4 side between pa and pd. On the other hand, since the scribe mark Sx is not formed on the non-guaranteed surface 3 side of each of the end faces pa to pd, the straightness of each of the end faces pa to pd on the non-guaranteed surface 3 side is the same as the guaranteed surface 4 side. not good compared to Therefore, when cutting and polishing the end faces pa to pd of the glass plate g, chipping and cracking are less likely to occur on the side of the guaranteed surface 4 of the glass plate g, leading to improved quality of the glass plate g. Moreover, since the scribe marks Sx on the glass plate g are eliminated by performing the processing step G, generation of glass powder and breakage in subsequent steps can be prevented.

As shown in FIG. 13, the glass plate g that has undergone the processing step G is subjected to cleaning treatment by the cleaning device 20 in the cleaning step H while being transported by the conveyer while maintaining the flat position. This cleaning treatment removes the glass powder adhering to the security surface 4 of the glass plate g due to the execution of the third cutting step F. Further, the glass plate g that has undergone the cleaning process is subjected to a drying process by the drying device 21 in the drying process J while being transported by the conveyer while maintaining the flat position. As described above, the glass plate g as a product is obtained. After that, in the loading process K, the glass sheets g as products are alternately stacked with the protective sheets 9 on the pallet 22 in the flat posture as it is. In the cleaning process H and the drying process J, in order to facilitate the removal of the cleaning liquid, the posture of the glass plate g is changed from the flat posture to a posture in which the guarantee surface 4 is tilted, for example, by 1 to 10° with respect to the horizontal plane. good too.

In the above embodiment, the scribe lines S1 and S2 are formed on the non-guaranteed surfaces 3 of the glass original plates G1 and G2 in both the first cutting step B and the second cutting step C, but the first cutting step B and the second cutting In either step C, a scribe line may be formed on the security surface 4 of the original glass plate. From the viewpoint of reliably suppressing the adhesion of glass powder to the guaranteed surface of the original glass plate, in both the first cutting step B and the second cutting step C, as in the above embodiment, the non-guaranteed surfaces of the original glass plates G1 and G2 3 to form scribe lines S1 and S2.

In the above embodiment, the glass ribbon is formed by the overflow down-draw method, but other down-draw methods such as the slot down-draw method and the redraw method may be employed.

A Forming process B First cutting process C Second cutting process D Storage process E Posture changing process F Third cutting process G Processing process H Cleaning process 3 Non-guaranteed surface 4 Guaranteed surface 9 Protective sheet 10 Pallet 11 Back supporting part 12 Glass original plate Laminated body 13 Bottom supporting portion GR Glass ribbon G1 Glass original plate (first glass original plate)
G2 glass substrate (second glass substrate)
Ga Both ends in the width direction of the original glass plate g Glass plates Pa to Pd End surfaces pa to pd of the glass original plate Each end surface of the glass plate Sx Scribe mark Z Glass original plate package

Claims (10)

A forming step of forming a glass ribbon by a down-draw method, a first cutting step of cutting out a glass base plate from the glass ribbon formed in the forming step by scribe cutting along the width direction, and a glass base plate that has undergone the first cutting step. a second cutting step of holding the glass plate in a vertical position and removing both ends in the width direction of the glass plate by scribing along the vertical direction, and obtaining a glass plate from the glass plate that has undergone the second cutting step. A method of manufacturing a plate, comprising:
In at least one of the first cutting step and the second cutting step, a scribe line is formed on a non-guaranteed surface selected from a guaranteed surface that is one main surface and a non-guaranteed surface that is the other main surface of the glass substrate. A method for manufacturing a glass plate, characterized by: The method for manufacturing a glass plate according to claim 1, wherein a scribe line is formed on the non-guaranteed surface of the original glass plate in both the first cutting step and the second cutting step. It further comprises a storage step of stacking and storing the glass original plate and the protective sheet that have undergone the second cutting step on a pallet in a vertical posture, and in the storage step, the security surface of the glass original plate is provided on the pallet. 3. The method for producing a glass plate according to claim 1, wherein the glass plate is supported by a back support. 4. The method of manufacturing a glass plate according to claim 3, wherein the storage step includes a transfer step of transferring the original glass plate and the protective sheet laminated on the pallet. The method for manufacturing a glass plate according to claim 3 or 4, wherein the protective sheet is a foamed resin sheet. It further comprises a third cutting step of cutting out a glass plate from the original glass plate that has undergone the storage step by scribing, and a cleaning step of cleaning the glass plate that has undergone the third cutting step, wherein the third cutting step comprises: A scribe line is formed on the guaranteed surface of the glass raw plate while the glass raw plate is laid flat and the non-guaranteed surface of the glass raw plate is supported from below, and the glass plate is flattened in the cleaning step. The method for manufacturing a glass plate according to any one of claims 1 to 5, wherein the glass plate is washed with the non-guaranteed surface of the glass plate being supported from below in a placed posture. 7. The method for conveying a glass plate according to claim 6, further comprising a processing step of processing the end surface of the glass plate with a processing tool between the third cutting step and the cleaning step. A glass original plate package comprising a glass original plate laminate in which a glass original plate and a protective sheet are laminated in a vertical posture, and a pallet on which the glass original plate laminate is loaded,
Both the end face along the longitudinal direction and the end face along the lateral direction of the original glass plate are cut surfaces by scribing, and at least one of the end faces is one main surface of the original glass plate. A package of glass original plates, characterized in that the non-guaranteed surface side of the non-guaranteed surface which is the main surface of (1) has scribe marks on the non-guaranteed surface side. 9. The glass original plate package according to claim 8, wherein both the end faces along the longitudinal direction and the end faces along the lateral direction of the original glass plate have scribe marks on the non-guaranteed surface side. The pallet includes a back supporting portion that supports the back surface of the glass original plate laminate and a bottom surface supporting portion that supports the bottom surface of the glass original plate laminate, and the guarantee surface of the glass original plate is on the back supporting portion side. The glass original plate package according to claim 8 or 9, located in .

Images