WO2014112444A1

WO2014112444A1 - Glass plate housing body and method for manufacturing chemically strengthened glass

Info

Publication number: WO2014112444A1
Application number: PCT/JP2014/050362
Authority: WO
Inventors: フロホンスシェイバーツ; 浩司中川; 尚史青山
Original assignee: 旭硝子株式会社
Priority date: 2013-01-18
Filing date: 2014-01-10
Publication date: 2014-07-24
Also published as: CN104936926A; JPWO2014112444A1; TW201434769A

Abstract

The present invention is a glass plate housing body that is put into a molten salt when chemically strengthening a plurality of glass plates and is provided with: a housing part that houses the plurality of glass plates in a vertical state; a mounting part provided in the bottom of the housing part and in which lower edges of the plurality of glass plates are mounted; and a plurality of support parts that protrude to the inside of the housing part so as to support both sides of the plurality of glass plates. The plurality of support parts have expanded parts that contact peripheral edge parts of the glass plates and constricted parts on the base end parts of the expanded parts. The expanded parts are expanded in a direction orthogonal to the axis of the support parts.

Description

Glass plate container and method for producing chemically strengthened glass

The present invention relates to a glass plate container and a method for producing chemically strengthened glass.

As one method of strengthening a glass plate, for example, there is a method of chemically strengthening a glass plate by introducing it into a molten salt in which potassium nitrate or the like is melted (see, for example, Patent Document 1). In this method, a glass plate housing body in which a plurality of glass plates are housed is put into a molten salt bath heated to 400 to 450 ° C., immersed in a predetermined time and subjected to ion exchange to be compressed on the surface of the glass plate. A stress layer is formed.

In order to improve the processing efficiency in a single charging operation, it is desirable to increase the glass plate area and to increase the number of glass plates stored in the glass plate container. For example, when a glass plate is used as a cover for a portable electronic device display, it tends to be thinner for weight reduction. As a glass plate storage body, a configuration in which support members are provided on the left and right side walls to support each glass plate in a vertically standing state and to increase the number of glass plates stored by narrowing the interval between the glass plates. There are things.

FIG. 1 is a plan view showing an example of a support member provided in a conventional glass plate housing. As shown in FIG. 1, the glass plate storage body 10 is provided with support members 20 </ b> A and 20 </ b> B that support the glass plate on

beams

12 and 14 that are horizontally mounted on both sides of the glass plate storage body 10. Each of the supporting

members

20A and 20B is made of metal because it is put into the molten salt heated to a high temperature, and the trapezoidal convex portions 30 and the trapezoidal concave portions 40 are alternately formed at a predetermined pitch. Has been. The plurality of glass plates 50 are supported in a substantially vertical state by inserting the

peripheral edge portions

52 and 54 on both sides into the recess 40. Further, each glass plate 50 is supported by the vicinity of the base of the inclined portion 32 having the narrowest width between the convex portions 30 (the back portion of the concave portion 40).

However, when chemically strengthening a glass plate using a conventional glass plate container, the following problems have occurred.

The damage | wound which causes a chipping (chip) generate | occur | produces in the end surface (edge) of the

peripheral parts

52 and 54 of the glass plate 50 (refer A section in FIG. 1).

A part of the container comes into contact with the surface of the glass plate 50 (the front surface and the back surface inside the peripheral portions 52 and 54), and scratches and rubbing marks are generated (refer to portion B in FIG. 1).

When the glass plate 50 is put into the molten salt bath and when the glass plate 50 is pulled up from the molten salt bath, the

peripheral portions

52 and 54 of the glass plate 50 in the vertical state fall off from the

support members

20A and 20B. The

peripheral portions

52 and 54 of the glass plate 50 drop off from the

support members

20A and 20B due to vibrations when the glass plate storage body 10 is transported by a vehicle or when the glass plate storage body 10 is moved up and down by a lifting device. Thus, the glass plate is broken or damaged (see part C in FIG. 1).

After the glass plate storage body 10 is put into the molten salt bath to chemically strengthen the surface of the glass plate 50, when the glass plate storage body 10 is pulled up from the molten salt bath, the supporting member 20A where the molten salt becomes a contact location , 20B and the glass plate 50 remain, and the glass surface is soiled (see part D in FIG. 1). For example, in the case of potassium nitrate (KNO ₃ ), the molten salt crystallizes and adheres when the temperature falls below the melting point (334 ° C. or below). Therefore, when a molten salt adheres to the surface of the glass plate 50, it is difficult to remove the molten salt that has adhered in the subsequent steps.

JP 2001-192239 A

This invention makes it a subject to provide the manufacturing method of the glass plate container and chemical-strengthening glass which do not produce the damage and damage of the site | part which leads to the quality fall of a glass plate before and after the above-mentioned chemical strengthening process.

In order to solve the above problems, the present invention has the following means.

The present invention, when chemically strengthening a plurality of glass plates, is a glass plate container that is put into the molten salt,
A storage section in which the plurality of glass plates are stored in a vertical state;
A placement portion provided at the bottom of the storage portion, on which lower ends of the plurality of glass plates are placed; and
A plurality of support portions projecting inside the storage portion so as to support both sides of the plurality of glass plates;
The plurality of support portions are:
A bulging portion in contact with the peripheral edge of the glass plate;
A constricted portion at a proximal end portion of the bulging portion;
The bulge portion bulges in a direction perpendicular to the axis of the support portion.

According to the present invention, the end face (edge) of the peripheral edge of the glass plate is non-contact even if the peripheral edge of the glass plate contacts the bulging part of the support part before, during or after the chemical strengthening process. Chipping of the end face of the part can be prevented, and scratches and rubbing marks due to contact can be prevented from being attached to the surface of the glass plate. Moreover, since the peripheral part of a glass plate is hold | maintained by the narrow space | interval between the bulging part of a pair of support part, the displacement of the surface direction of a some glass plate is suppressed, and the space | interval of each glass plate is ensured and ion is carried out. Each glass plate can be supported in a vertical state so as not to prevent replacement. In addition, the contact position with the bulging part that supports each glass plate is on the inner side from the end surface of the peripheral part of the glass plate, and even if the glass plate is displaced by vibration or the like, the peripheral part of the glass plate is detached from the bulging part. Since it becomes difficult, the damage and damage of the site | part which leads to the quality fall of the glass plate before and during a chemical strengthening process or during a process can be prevented. In addition, since the peripheral portion of the glass plate contacts a part of the curve of the bulging portion of the support portion, the molten salt tends to fall after being pulled up from the molten salt tank, and the molten salt is between the glass plate and the support member. It becomes difficult to remain, and the effect of preventing fouling of the glass plate surface after the chemical strengthening treatment can be obtained.

It is a top view which shows the structural example of the conventional glass plate accommodating body. It is a perspective view which shows Embodiment 1 of the glass plate accommodating body by this invention. It is the longitudinal cross-sectional view which looked at the glass plate storage body by this invention from the front. It is the top view which looked at the glass plate storage body by this invention from upper direction. It is the side view which looked at the glass plate storage body by this invention from the side. It is a top view which shows the structure of the support part provided in the glass plate accommodating body. It is a top view which shows the dimensional relationship and attachment position of each part of a support part. It is a top view which shows the dimensional relationship and attachment position of each part of the support part of a modification. It is a top view which shows the displacement possible range of the glass plate with respect to each support part. It is a top view which shows the relationship between the displacement of a glass plate, and each support part.

DESCRIPTION OF SYMBOLS 100 Glass plate storage body 110 Glass plate 102 Support |

pillar

104, 106 Beam 112 Product area 114 Peripheral part 120 Glass plate storage part 130 Glass

plate mounting part

132, 134 Mounting board 136 Bottom part opening 140 Glass

plate support mechanism

150,

150A Support part

152, 152A bulging part 152a, 152Aa tip 152b, 152Ab base end 152c, 152Ac

intermediate part

154, 154A constricted part

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

[Configuration of Glass Plate Housing of Embodiment 1]
FIG. 2 is a perspective view showing Embodiment 1 of the glass plate container according to the present invention. As shown in FIG. 2, the glass plate storage body 100 is configured such that a plurality of glass plates 110 (indicated by a one-dot chain line in FIG. 2) can be stored in a vertical state, for example, an elevating device (not shown). Thus, the glass plate 110 is lowered into the molten salt bath, and the glass plate 110 is put into the molten salt to be used in a process of chemical strengthening.

The glass plate storage body 100 is a combination of a plurality of support columns 102 and a plurality of

beams

104 and 106 in a rectangular parallelepiped shape, and has a structure having a plurality of openings in each direction so that molten salt can easily flow in and out. It has become. Note that the struts 102 and the beams 104 are arbitrarily set in combination such as the number and interval according to the size and number of glass plates to be stored.

The glass plate storage body 100 includes a glass plate storage portion 120, a glass plate placement portion 130, and a plurality of glass plate support mechanisms 140. The glass plate storage unit 120 is a space surrounded by a plurality of columns 102 and a plurality of beams 104, and has a space in which a large number of glass plates 110 can be stored in a vertical state.

In the glass plate mounting portion 130, a pair of

mounting plates

132 and 134 are disposed on both sides in the left-right direction (X direction) of the bottom portion of the glass plate storage portion 120, and a bottom opening 136 is provided in the middle portion. The bottom opening 136 is provided so that the molten salt can easily flow into the glass plate storage unit 120 from the bottom side, and the number and size of the glass plates are appropriately set according to the size and number of glass plates to be stored. Is set.

Each glass plate support mechanism 140 includes a plurality of glass plate supporting beams 106 that are horizontally mounted at intermediate heights on both sides of the glass plate storage portion 120, and side walls of the respective beams 106 that surround the glass plate storage portion 120. And a plurality of support portions 150 fixed at predetermined intervals. The support parts 150 are aligned at a predetermined height in the Y direction (horizontal direction) at a constant interval, and protrude inward (X direction) of the glass plate storage part 120. Between the pair of support portions 150 adjacent in the Y direction, the peripheral edge portion of the glass plate 110 in a vertical state is inserted.

In the present embodiment, the glass plate support mechanisms 140 are arranged at different height positions on the left and right sides of the glass plate storage unit 120. Further, the number of glass plate support mechanisms 140 arranged in the height direction (Z direction) may be appropriately arranged at three or four locations according to the height direction dimensions of the glass plate 110.

FIG. 3 is a longitudinal sectional view of the glass plate housing 100 according to the present invention as seen from the front. As shown in FIG. 3, the glass plates 110 are stored in a vertical state inside the glass plate storage portion 120 of the glass plate storage body 100, and one side is four from the both sides in the left-right direction (X direction). It is supported by the support part 150. The glass plate 110 is mounted on the mounting

plates

132 and 134 of the glass plate mounting portion 130 at the lower edge.

The glass plate 110 has a rectangular product region 112 and a peripheral portion 114 surrounding four sides in the X and Z directions of the product region. The product region 112 is a non-removal planned region where surface treatment is performed in a later process, and the peripheral portion 114 is a planned removal region removed in a later process. Therefore, since the peripheral edge 114 of the glass plate 110 is cut and removed in a subsequent process, even if it contacts each support part 150, it can be supplied to the subsequent process without any trouble.

FIG. 4 is a plan view of the glass plate storage body 100 according to the present invention as viewed from above. FIG. 5 is a side view of the glass plate housing 100 according to the present invention as seen from the side. As shown in FIGS. 4 and 5, each support portion 150 protrudes inside the glass plate storage portion 120 so as to support both sides in the X direction of the glass plate 110. Therefore, the glass plate 110 is supported by inserting the peripheral edge portion 114 between the pair of support portions 150 protruding from the side. Each glass plate 110 is inserted in a vertical state, but is supported at an angle slightly inclined with respect to the vertical line because the front surface or the back surface of the peripheral portion 114 is in contact with the outer periphery of the support portion 150. The

Since the minimum interval between the pair of support portions 150 is formed relatively narrow (the gap between the surface of the glass plate 110 is as small as possible) according to the thickness of the glass plate 110 as described later, The inclination is kept relatively small. A sufficient space (interval) that does not hinder ion exchange is formed between other adjacent glass plates 110. Further, even when the adjacent glass plates 110 are tilted in the opposite directions, the upper ends of the glass plates 110 are only closer to each other than the lower ends and do not contact each other.

[Configuration of Support Unit 150]
FIG. 6 is a plan view showing the configuration of the support portion 150 provided in the glass plate storage body 100. As shown in FIG. 6, the support portion 150 includes a bulging portion 152 that contacts the peripheral edge portion 114 of the glass plate 110, and a constricted portion 154 that is connected to the proximal end portion of the bulging portion 152. Further, the bulging portion 152 has a convex curved surface on the outer periphery, and is formed so as to bulge in a direction (radial direction) perpendicular to the central axis O of the support portion 150.

Furthermore, the support part 150 is formed of a metal (for example, stainless steel) having chemical durability against the molten salt, and the outer peripheral surface thereof is processed into a smooth surface without unevenness by buffing or the like. Therefore, when the glass plate storage body 100 is pulled up from the molten salt tank, the molten salt attached to the surface of the support portion 150 is likely to drop, and the molten salt is unlikely to remain at the contact portion between the support portion 150 and the glass plate 110. It is configured.

The bulging portion 152 and the constricted portion 154 may be formed integrally with the support portion 150, or the bulging portion 152 and the constricted portion 154 are processed as separate parts, and a plurality of parts are combined. It is also good.

The bulging portion 152 has an outer peripheral surface in the radial direction so that the distal end 152a and the proximal end 152b in the axial direction (X direction) have the smallest diameter, and the intermediate portion 152c between the distal end 152a and the proximal end 152b has the largest diameter. It is formed in a convex curved surface that swells. However, the diameter here is a distance between a corresponding point on the outer peripheral surface on the XY plane and the central axis O, and the cross section is not necessarily limited to a circle.

Further, the tip 152a may have a shape having a flat surface on the YZ plane as shown in FIG. 6, or a shape having a hemispherical curved surface. When the tip 152a is formed in a curved surface as shown in FIG. 8 to be described later, the tip has a shape having a predetermined radius of curvature. Therefore, when the tip 152a does not have a flat surface, the most advanced diameter is 0 (mm). Furthermore, since the bulging portion 152 only needs to be formed in a convex curved surface so that the middle portion has the maximum radius, the radius of curvature in the XY plane is set to an arbitrary radius or the radius of curvature in the X direction is not constant. The shape may change gradually.

Therefore, between the pair of support portions 150 adjacent to each other, the intervals P1 and P2 between the distal ends 152a and the proximal end 152b are wide, and the interval G between the intermediate portions 152c is narrow (G <P1, G <P2). This interval G is the minimum interval between the support portions 150 and is set to be within a predetermined range with respect to the thickness of the glass plate 110.

Further, as the gap G becomes smaller, the inclination of the glass plate 110 can be suppressed, and the glass plate 110 can be stably supported. In the present embodiment, with respect to the thickness of the glass plate 110, the minimum interval between the bulging portions 152 of the pair of support portions 150 (interval G between the intermediate portions 152 c) is the minimum interval according to the thickness of the glass plate 110. Set to

The narrow portion 154 has a proximal end fixed to the side wall of the beam 106 and a distal end coupled or integrated with the bulging portion 152. Further, the constricted portion 154 has a smaller diameter than the outer diameter of the intermediate portion 152c of the bulging portion 152, and a wide escape space S (shown by a broken line in FIG. 6) between the adjacent constricted portion 154 and the side wall of the beam 106. Forming region). Due to the presence of the escape space S, when the peripheral edge 114 of the glass plate 110 is displaced in the axial direction (X direction) of the support portion 150, the end face (edge) of the peripheral edge 114 contacts the beam 106 or the constricted portion 154. Is prevented. In addition, as a fixing method with respect to the beam 106 of the narrow part 154, you may fasten with a volt | bolt and a nut, or you may use arbitrary fixing methods, such as welding and adhesion | attachment.

Here, an example of setting each dimension of the bulging portion 152 and the constricted portion 154 will be described. FIG. 7 is a plan view showing the dimensional relationship and mounting position of each part of the support part. As shown in FIG. 7, the dimensions L1 to L7 of the support portion 150 are determined as follows.

The dimension L1 is the length of the clearance space S in the axial direction, and is the length from the end face of the glass plate 110 to the side wall of the beam 106. In this embodiment, L1 = 15 mm is set. The glass plate 110 may be displaced in the axial direction (X direction) by vibrations or rolls during transportation or lifting. A displacement amount at that time is assumed to be about 5 to 10 mm. Therefore, by setting L1 = 15 mm, the end surface of the peripheral edge 114 of the glass plate 110 is prevented from contacting the side wall of the beam 106.

The dimension L2 is a length in which the bulging portion 152 and the glass plate 110 face each other in the axial direction (X direction), and is a region (supportable range) in which the peripheral portion 114 of the glass plate 110 can be supported. The length from the front end 152 a to the base end 152 b of the bulging portion 152 is set according to the length of the peripheral edge portion 114 of the glass plate 110. For example, when the length of the peripheral portion 114 in the X direction is 10 mm, L2 is set to 25 mm in view of a margin when the peripheral portion 114 is displaced. For example, when the glass plate 110 is placed such that the middle of the peripheral portion 114 in the X direction coincides with the middle portion 152c having the largest diameter among the bulging portions 152, the glass plate 110 is about 5 to 10 mm in the X direction. Even if it is displaced, it is possible to prevent the end surface of the peripheral portion 114 from being detached from the tip 152 a of the bulging portion 152.

The dimension L3 is the distance between the center lines of the pair of support parts 150 (distance between the axes), and the thickness of the glass plate 110 and the plane direction between the pair of glass plates 110 that does not hinder ion exchange due to the flow of molten salt. It is set according to the interval G. In the present embodiment, the same dimension as the distance in the surface direction (20 mm) between the pair of glass plates 110 is set to L3 = 20 mm.

Dimension L4 is the minimum interval between the intermediate portions 152c of the bulging portion 152, and is the interval between the contact points H that support the glass plate 110. That is, the dimension L4 is an interval G of the bulging portions 152 determined according to the thickness t of the glass plate 110, and is defined so as to satisfy t (mm) ≦ G ≦ t + 5 (mm), preferably t ( mm) ≦ G ≦ t + 3 (mm). For example, when the thickness of the glass plate 110 is t = 0.7 mm, L4 may be 5.7 (mm) or less, and preferably 3.7 (mm) or less. In this embodiment, L4 = 3 mm. Thereby, as for the glass plate 110, the play of the surface direction (Y direction) between a pair of support parts 150 is suppressed to 5 mm or less, Preferably it is 3 mm or less. Thereby, even if the vibration during conveyance propagates, the vibration in the surface direction (Y direction) of the glass plate 110 is suppressed to be small, so that the contact pressure due to contact with the bulging portion 152 can be reduced.

The dimension L5 is a distance from the intermediate portion 152c having the largest diameter among the bulging portions 152 supporting the glass plate 110 to the end surface of the glass plate 110. That is, the dimension L5 is an overlap distance facing the peripheral edge 114 of the glass plate 110, and the position of the end face of the glass plate 110 can be allowed up to 10 mm.

The dimension L6 is the diameter of the constricted portion 154 because the cross section perpendicular to the central axis O of the support portion 150 is always circular in this embodiment. The vertical cross-sectional shape of the constricted portion 154 is a circle, but may be a shape other than a circle (for example, an elliptical shape). Further, the dimension L6 is set so as to have a strength capable of stably supporting the bulging portion 152. In this embodiment, for example, L6 = 6 mm is set. In addition, although an intensity | strength will improve if the outer diameter of the bulging part 152 is enlarged, since the constriction part 154 becomes thick and the above-mentioned escape space S becomes narrow, the balance of escape space S and intensity | strength is considered. Set to any dimension.

The dimension L7 is the width of the clearance space S in the Y direction, and is defined by the diameter L6 of the constricted portion 154 and the distance (interaxial distance) L3 between the center lines O of the pair of support portions 150. In this embodiment, L7 = 14 mm.

[Modification]
FIG. 8 is a plan view showing the dimensional relationship and the mounting position of each part of the support part of the modification. As shown in FIG. 8, the modified support portion 150A has the same dimensions L1 to L7 as the support portion 150 shown in FIGS. 6 and 7, but the tip 152Aa and intermediate portion 152Ac of the bulging portion 152A. The external shape is different. That is, the tip 152Aa has a shape that does not have a flat surface at the tip, and is formed in a hemispherical shape. The intermediate portion 152Ac is a curved surface that connects the distal end 152Aa and the proximal end 152Ab, and the outer radius in the XY plane is not a constant radius of curvature, and the radius of curvature changes depending on the position in the axial direction (X direction) like a parabola. It is formed in a curved shape having such a convex curved surface.

Also, when the tip 152Aa is formed into a curved surface that does not have a flat surface, the tip 152Aa has a shape with a predetermined radius of curvature, so the tip diameter is 0 (mm).

The present invention is not limited to the embodiment shown in FIGS. 6 and 7, and a plan view showing the dimensional relationship and the mounting position of each part of the support part 150 provided in the glass plate housing 100 is, for example, as shown in FIG. 8. Various forms are also included. As shown in FIG. 8, in this modification, the tip 152 </ b> Aa of the support portion 150 </ b> A includes a shape having no flat surface and no width.

As shown in FIGS. 7 and 8, for example, the dimensions L1 to L7 of the

support portions

150 and 150A are L1 = 15 mm, L2 = 29 mm, L3 = 15 mm, L4 = 5.0 mm, and L5 = 12, respectively. .5 mm, L6 = 6.0 mm, and L7 = 9.0 mm. The above numerical values of the dimensions L1 to L7 show an example of the present embodiment, and desired numerical values can be appropriately set according to conditions such as the shape of the support portion 150 and the interval between the support portions 150.

Here, the state of the glass plate 110 accommodated in the glass plate container 100 before and after the chemical strengthening treatment or during the treatment will be described.

Each glass plate 110 before and after the chemical strengthening treatment or during the treatment is brought into a vertical state by each support portion 150 of the glass plate support mechanism 140 disposed inside the glass plate storage body 100 in the left-right direction (side in the X direction). It is supported. And the glass plate storage body 100 is thrown into a molten salt tank by the raising / lowering operation | movement of a raising / lowering apparatus. Thus, the surface of each glass plate 110 housed in the glass plate housing 100 is immersed in a molten salt heated to a high temperature (400 to 450 ° C.) and subjected to a chemical strengthening treatment. The chemical strengthening process for each glass plate 110 is performed for a predetermined time. Then, when the chemical strengthening process is completed, each glass plate 110 housed in the glass plate housing 100 is taken out of the molten salt bath by the lifting and lowering operation of the lifting device to become chemically strengthened glass.

Next, the relative positional relationship between the glass plate 110 housed in the glass plate housing body 100 before and after the chemical strengthening treatment and during the treatment and each support portion 150 will be described.

FIG. 9 is a plan view showing a displaceable range of the glass plate 110 with respect to each support portion 150. As shown in FIG. 9, the relative position between the initial position of the glass plate 110 (shown by a solid line) and the position after the displacement of the glass plate 110 (shown by a broken line) is taken into consideration before and after the chemical strengthening treatment. It is important to do. When the relative positional relationship is taken into consideration, the peripheral edge portion 114 even if the glass plate 110 is displaced in the X direction with respect to the initial distance L8 from the contact point H with the intermediate portion 152c of the bulging portion 152 to the end surface of the glass plate 110. Is preferably in contact with the contact point H. That is, in the present embodiment, when the glass plate 110 has a region to be removed that is removed in a subsequent process at the peripheral portion 114, the plurality of support portions 150 extend from the edge of the glass plate 110 to the tip of the bulging portion 152. The facing range facing the surface of the glass plate 110 is set to a length corresponding to the width dimension (10 mm in the present embodiment) of the area to be removed. Thereby, the contact point H with the bulging part 152 is within the range of the peripheral part 114 before and after the chemical strengthening process or during the transporting operation and the lifting operation during the processing.

Since the peripheral portion 114 is a region to be removed in a subsequent process, there is no problem even if scratches or marks remain due to contact with the support portion 150 before or after the chemical strengthening treatment or during the treatment. Therefore, the initial position when the glass plate 110 is inserted between the pair of support portions 150 matches the position of the intermediate point in the X direction of the peripheral edge portion 114 and the contact point H between the intermediate portion 152c of the bulging portion 152. Be made. Thereby, even if the position shift of the X direction of the glass plate 110 arises before and after the chemical strengthening process or during the carrying operation and the raising / lowering operation during the process, it is possible to prevent the breakage or damage of the portion leading to the quality deterioration of the glass plate 110.

FIG. 10 is a plan view showing the relationship between the displacement of the glass plate 110 and each support portion 150. As shown in FIG. 10, for example, when the glass plate 110 is displaced in the X direction before and after the chemical strengthening process or during the transporting operation and the lifting operation during the process, the surface (front surface) of the peripheral edge 114 of the glass plate 110. Alternatively, the back surface is displaced along the convex curved surface of the bulging portion 152 to bend into an arc shape. Thereby, the peripheral part 114 of the glass plate 110 reduces the contact pressure with respect to the convex curved surface of the bulging part 152, and also reduces friction. Therefore, the peripheral edge 114 of the glass plate 110 is not damaged by contact with the bulging portion 152, and no rubbing trace is generated.

Moreover, since the peripheral part 114 becomes circular arc shape when the force of a surface direction (Y direction) acts on the glass plate 110, it will become a point contact of the convex curved surface and curved surface of the bulging part 152, and is like a corner | angular part. Further, since the contact pressure does not act locally, the damage on the surface of the peripheral edge 114 is extremely small. Furthermore, since the end surface of the peripheral edge 114 of the glass plate 110 does not contact the side wall of the beam 106 and can swing in the escape space S (see FIG. 7), the end surface is also prevented from being damaged and the occurrence of chipping is suppressed. It becomes possible.

That is, even if the peripheral portion 114 of the glass plate 110 contacts the bulging portion 152 of the support portion 150 from the surface direction (Y direction) before and after the chemical strengthening process or during the transporting operation and the lifting operation during the processing, the glass The end face (edge) of the peripheral edge 114 of the plate 110 becomes non-contact, and chipping of the end face of the peripheral edge 114 can be prevented. At the same time, it is possible to prevent the surface of the glass plate 110 from being scratched or rubbing due to contact, and it is possible to prevent breakage or damage of the portion that leads to the quality deterioration of the glass plate 110. Moreover, since the peripheral part 114 of the glass plate 110 is hold | maintained by the narrow space | interval G (refer FIG. 6) between the bulging parts 152 of a pair of support part 150, the displacement of the surface direction (Y direction) of the several glass plate 110 is carried out. Can be suppressed. Further, it is possible to support each glass plate 110 in a vertical state so as to ensure a space in the plane direction of each glass plate 110 and not hinder ion exchange. As described above, the plurality of glass plates 110 are stably supported in a vertical state at a narrow interval, thereby increasing the number of processed sheets by the chemical strengthening process per one time and increasing the production efficiency.

Further, the peripheral edge portion 114 of the glass plate 110 is held at a narrow interval between the bulging portions 152 of the pair of support portions 150 and has a constricted portion 154 on the proximal end side of the bulging portion 152. Therefore, the contact position H with the bulging portion 152 that supports each glass plate 110 is on the inner side (center side in the X direction) from the end surface of the peripheral edge portion 114 of the glass plate 110. Thereby, even if the glass plate 110 is displaced by the vibration before and after the chemical strengthening treatment or during the treatment, the peripheral edge portion 114 of the glass plate 110 is not easily detached from the bulging portion 152.

Further, since the peripheral edge portion 114 of the glass plate 110 contacts a part of the convex curved surface of the bulging portion 152 of the support portion 150, the molten salt is formed after the glass plate container 100 is pulled up from the molten salt tank after the chemical strengthening treatment. It is easy to fall, and it is difficult for molten salt to remain between the glass plate 110 and the support part 150. Therefore, the contamination by the molten salt on the surface of each glass plate 110 after pulling up the glass plate storage body 100 from the molten salt tank after the chemical strengthening treatment can be prevented.

In the above description of FIG. 9 and FIG. 10, the operation and effect when the support portion 150 shown in FIG. 6 and FIG. 7 is used have been described. However, the support portion 150A of the modified example shown in FIG. Of course, similar actions and effects can be obtained.

This international application claims priority based on Japanese Patent Application No. 2013-007910 filed on January 18, 2013, the entire contents of which are incorporated herein by reference.

Claims

When chemically strengthening a plurality of glass plates, a glass plate container that is put into molten salt,
A storage section in which the plurality of glass plates are stored in a vertical state;
A placement portion provided at the bottom of the storage portion, on which lower ends of the plurality of glass plates are placed; and
A plurality of support portions projecting inside the storage portion so as to support both sides of the plurality of glass plates;
The plurality of support portions are:
A bulging portion in contact with the peripheral edge of the glass plate;
A constricted portion at a proximal end portion of the bulging portion;
The bulge portion bulges in a direction perpendicular to the axis of the support portion.
The plurality of support portions have a distal end and a base end in an axial direction of the bulging portion that are smaller in diameter than an intermediate portion between the distal end and the base end, and the intermediate portion has a convex curved surface. The glass plate container according to claim 1, wherein
The plurality of support portions are horizontally aligned at a desired height position of the storage portion, and end portions of the constricted portions are fixed inside the storage portion at desired intervals. Item 3. The glass plate container according to Item 1 or 2.
The glass plate container according to any one of claims 1 to 3, wherein the plurality of support portions have chemical durability with respect to the molten salt.
The glass plate storage body according to any one of claims 1 to 4, wherein the plurality of support portions are formed on a smooth surface having no unevenness on an outer peripheral surface.
When the glass plate has a region to be removed that will be removed in a later step, the plurality of support portions have a facing range facing the surface of the glass plate from the edge of the glass plate to the tip of the bulging portion. The glass plate storage body according to any one of claims 1 to 5, wherein the glass plate storage body has a length corresponding to a width dimension of the region to be removed.
In the method for producing chemically tempered glass, in which a plurality of glass plates are placed in a molten salt in a state of being accommodated in a glass plate container, and the glass plate is chemically strengthened,
The glass plate container is
A storage section in which the plurality of glass plates are stored in a vertical state;
A placement portion provided at the bottom of the storage portion, on which lower ends of the plurality of glass plates are placed; and
A plurality of support portions projecting inside the storage portion so as to support both sides of the plurality of glass plates;
The plurality of support portions are:
A bulging portion in contact with the peripheral edge of the glass plate;
A constricted portion at a proximal end portion of the bulging portion;
The method of producing chemically tempered glass, wherein the bulging portion bulges in a direction perpendicular to the axis of the support portion.
The thickness of the glass plate stored in the glass plate storage body is t (mm), and the gap G between the bulging portions of the plurality of support portions is t (mm) ≦ G ≦ t + 5 (mm). The method for producing chemically strengthened glass according to claim 7.