WO2014196500A1

WO2014196500A1 - Glass tape, glass tape manufacturing method and product manufacturing method

Info

Publication number: WO2014196500A1
Application number: PCT/JP2014/064617
Authority: WO
Inventors: 智昭川村; 俊輔岸本
Original assignee: 日本電気硝子株式会社
Priority date: 2013-06-03
Filing date: 2014-06-02
Publication date: 2014-12-11
Also published as: JPWO2014196500A1; TW201502092A; JP6358090B2

Abstract

This glass tape (1) has thickness D, width W and length L, and satisfies D < W and W < L. This glass tape (1) is curved in the width direction. The glass tape (1) has a first principal surface (F1), a second principal surface (F2) opposite of the first principal surface (F1), and two lateral edges (3). The glass tape (1) is curved across the width between the two lateral edges (3). A center surface (CF) passing through the two lateral edges (3) is curved. The glass tape (1) is optimally curved in the same direction across the width between the two lateral edges (3).

Description

Glass tape, glass tape manufacturing method, and product manufacturing method

The present invention relates to a tough and flexible glass tape, a glass tape manufacturing method, and a product manufacturing method.

Patent Document 1 discloses a glass ribbon (glass tape) having a thickness of 100 μm or less. This glass ribbon does not break even when wrapped around a human finger. The surface of the glass ribbon is formed as smoothly as possible. When arrange | positioning a glass ribbon on a glass plate, both contact becomes surface contact.

JP 2011-46593 A

In surface contact between smooth surfaces, optical contact (optical contact) occurs. Due to the optical contact, the glass ribbon and the glass plate are strongly adhered to each other, and the positioning operation of the glass ribbon may be difficult.

This invention is made | formed in view of the said subject, The objective is suppressing generation | occurrence | production of an optical contact and using the glass tape which can perform positioning work easily, a glass tape manufacturing method, and a glass tape. It is providing the manufacturing method of the product which becomes.

According to the first aspect of the present invention, the glass tape has a thickness D, a width W, and a length L, and satisfies D <W. The glass tape is curved with respect to the width direction.

The glass tape of the present invention preferably has two side edges and is curved over the two side edges.

The glass tape of the present invention is preferably curved in one direction across the two side edges.

In the glass tape of the present invention, it is preferable that the center plane passing through the two side edges is curved.

In the glass tape of the present invention, the side edge preferably has a convex curved surface.

The glass tape of the present invention is preferably used by being placed on a flat surface. When the glass tape is arranged so that the two side edges are in contact with the flat surface, the curvature is such that a capillary phenomenon is caused by injecting liquid into the space between the flat surface. It is preferable to bend at R.

In the glass tape of the present invention, the curvature R is preferably 0.001% or more and 1.0% or less.

R = (H / W) × 100

H is the length of a perpendicular line extending from the bottom of the curved surface facing the flat surface to the flat surface when the glass tape is disposed so that the two side edges are in contact with the flat surface. .

The glass tape of the present invention preferably has a first main surface and a second main surface facing the first main surface. The first main surface is preferably curved along the second main surface.

The glass tape of the present invention preferably satisfies W <L.

According to the second aspect of the present invention, the glass tape manufacturing method includes a heating step, a stretching step, and a bending step. In the heating step, the mother glass plate is heated. In the stretching step, the heated mother glass plate is stretched and formed into a basic glass tape having a thickness Db, a width Wb, and a length Lb and satisfying Db <Wb. In the bending step, the basic glass tape having two side edges at both ends in the width direction is bent in one direction across the two side edges.

In the glass tape manufacturing method of the present invention, the bending step includes a step of sandwiching the basic glass tape with a mold, an atmospheric temperature on the first main surface side, and an atmospheric temperature on the second main surface side of the basic glass tape, respectively. A step of increasing the temperature of the first main surface side and the second main surface side at different heating rates so as to reach the first temperature and the second temperature in the first period, and during the second period, A step of maintaining the atmospheric temperature on the first main surface side and the atmospheric temperature on the second main surface side at the first temperature and the second temperature, respectively, and on the first main surface side held at the first temperature The first main surface side and the second main surface side are set such that the atmospheric temperature on the second main surface side maintained at the atmospheric temperature and the second temperature reach the third temperature in the third period, respectively. And a step of gradually cooling at different annealing rates. The step of raising the temperature, the step of holding, and the step of gradually cooling are performed in a state where the basic glass tape is sandwiched between the molds.

Alternatively, in the glass tape manufacturing method of the present invention, it is preferable that the bending step includes a step of sandwiching the basic glass tape with a curved mold while heating the basic glass tape.

Alternatively, in the glass tape manufacturing method of the present invention, the bending step includes a step of sandwiching the basic glass tape with a mold while heating the basic glass tape, and a first of the basic glass tape coming out of the mold. It is preferable to include a step of slowly cooling the main surface side and the second main surface side at different slow cooling rates.

Or in the glass tape manufacturing method of this invention, it is preferable that the said bending process is performed in the said extending process. It is preferable that the heating step includes a step of heating the first main surface side and the second main surface side of the mother glass plate at different temperatures.

According to a third aspect of the present invention, the product manufacturing method is a method for manufacturing a product including a glass tape and a first glass plate as members. The product manufacturing method includes a step of placing the glass tape on the first glass plate such that two side edges of the glass tape are in contact with the first glass plate, and the glass tape and the first glass plate. And injecting a liquid into the space between the two.

In the product manufacturing method of the present invention, it is preferable that the method further includes a step of placing the second glass plate on the glass tape. The glass tape functions as a thickness regulating member.

According to the present invention, since the glass tape is curved with respect to the width direction, when the glass tape is disposed on the flat surface of the glass plate, the contact area between the glass tape and the glass plate is small. As a result, the occurrence of optical contact can be suppressed, and the glass tape positioning operation on the glass plate can be easily performed.

It is a perspective view which shows typically the glass tape in Embodiment 1 of this invention. It is sectional drawing of the glass tape in Embodiment 1 of this invention. It is a front view which shows typically the glass tape of FIG. It is an enlarged view of the side edge of the glass tape of FIG. 3A. It is a flowchart which shows the glass tape manufacturing method in Embodiment 2 of this invention. It is a flowchart which shows the product manufacturing method in Embodiment 3 of this invention. It is a vertical side view which shows schematic structure of the glass tape manufacturing apparatus in Embodiment 4 of this invention. It is a figure explaining the temperature control by the glass tape manufacturing apparatus of FIG. It is a flowchart which shows the curvature process of the glass tape manufacturing method in Embodiment 5 of this invention. It is a front view which shows typically the metal mold | die used with the glass tape manufacturing method in Embodiment 6 of this invention. It is a figure explaining the temperature control by the glass tape manufacturing method in Embodiment 7 of this invention. It is a vertical side view which shows schematic structure of the glass tape manufacturing apparatus which performs the glass tape manufacturing method in Embodiment 8 of this invention. It is sectional drawing of the glass tape which concerns on the 1st example in Embodiment 9 of this invention. It is sectional drawing of the glass tape which concerns on the 2nd example in Embodiment 9 of this invention. It is sectional drawing of the glass tape which concerns on the 3rd example in Embodiment 9 of this invention. It is sectional drawing of the glass tape which concerns on the 4th example in Embodiment 9 of this invention. It is a figure explaining the glass tape in the Example of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof is not repeated. Moreover, a glass tape manufacturing method is described as "manufacturing method", and a glass tape manufacturing apparatus is described as "manufacturing apparatus."

(Embodiment 1)
[Basic principle]
FIG. 1 is a perspective view schematically showing a glass tape 1 according to Embodiment 1 of the present invention. The glass tape 1 has a thickness D, a width W, and a length L, and satisfies D <W. The glass tape 1 is curved with respect to the width direction of the glass tape 1. In FIG. 1, a glass plate 5 having a flat surface 7 is shown, and the glass tape 1 is disposed on the flat surface 7.

The glass tape 1 has high toughness and high flexibility as compared with a plate glass having a large thickness such as a window glass. The thickness D of the glass tape 1 having high toughness and high flexibility is, for example, 1 μm to 100 μm. The thickness D indicates, for example, an average thickness. In order to obtain a glass tape 1 having sufficiently high toughness and sufficiently high flexibility, the thickness D of the glass tape 1 is preferably 4 μm to 50 μm, and more preferably 10 μm to 30 μm. The thickness D indicates, for example, an average thickness. The glass tape 1 has two side edges 3. The two side edges 3 are substantially parallel. The glass tape 1 is curved over the two side edges 3. In other words, the glass tape 1 is curved with the two side edges 3 as both ends. The width W of the glass tape 1 is, for example, 5 mm to 50 mm. The width W indicates an average width, for example. In order to obtain a glass tape 1 that is easily bent, the width W of the glass tape 1 is preferably 7 mm to 40 mm, and more preferably 10 mm to 30 mm.

According to Embodiment 1, since the glass tape 1 is curved with respect to the width direction, when the glass tape 1 is disposed on the flat surface 7 of the glass plate 5, the contact between the two becomes a line contact. That is, as shown in FIG. 1, the two side edges 3 are in line contact with the glass plate 5. Since it is a line contact, the contact area of the glass tape 1 and the glass plate 5 is small compared with the case of surface contact. As a result, the occurrence of optical contact can be suppressed, and the positioning operation of the glass tape 1 on the glass plate 5 can be easily performed. The glass plate 5 is a concept including a glass substrate.

[Curved glass tape]
The bending of the glass tape 1 will be described with reference to FIG. FIG. 2 is a cross-sectional view of the glass tape 1. FIG. 2 shows a cross section when the glass tape 1 is cut along a plane orthogonal to the side edges 3. A direction CR1 and a direction CR2 indicate directions orthogonal to the flat surface 7 and are opposite to each other.

The glass tape 1 has a first main surface F1 and a second main surface F2 facing the first main surface F1. The second main surface F2 has a bottom BM. In the present specification, the bottom portion BM indicates a bottom point of the concave second main surface F2 in a cross-sectional view. The bottom BM is formed along the side edge 3.

In the glass tape 1, the center plane CF passing through the two side edges 3 is curved. That is, at least the second main surface F2 is curved such that the center surface CF passing through the two side edges 3 is curved. In the first embodiment, the first main surface F1 and the second main surface F2 are curved such that the center surface CF passing through the two side edges 3 is curved.

In this specification, the center plane CF is a virtual plane equidistant from the first main surface F1 and the second main surface F2. The center plane CF is on the two side edges 3 and the plurality of midpoints PM in a cross-sectional view when the glass tape 1 is disposed on the flat surface 7. In FIG. 2, one midpoint PM is shown for simplification of the drawing. The midpoint PM is a midpoint of a line segment connecting the first point P1 on the first main surface F1 and the second point P2 on the second main surface F2.

Here, the length from the first point P1 to the one side edge 3 along the first main surface F1 is A1, and the length from the first point P1 to the other side edge 3 along the first main surface F1 is B1. The length from the second point P2 to the one side edge 3 along the second main surface F2 is a1, and the length from the second point P2 to the other side edge 3 along the second main surface F2 is described as b1. Then, the following relationship is established.

A1 / B1 = a1 / b1

Further, the glass tape 1 is curved in one direction (direction CR1) over the two side edges 3 with respect to the width direction. In other words, the glass tape 1 is curved in one direction (direction CR1) with the two side edges 3 as both ends with respect to the width direction. Accordingly, the second main surface F2 has one bottom BM. The two side edges 3 of the glass tape 1 are in contact with the flat surface 7. That is, the glass tape 1 contacts the flat surface 7 at two contact points CP in a cross-sectional view. The second main surface F2 of the glass tape 1 is formed so that the space 9 is line symmetric. The space 9 is a space between the second main surface F2 and the flat surface 7.

Furthermore, the first main surface F1 is curved along the second main surface F2. That is, the first main surface F1 is substantially parallel to the second main surface F2. Accordingly, the first main surface F1 and the second main surface F2 are curved surfaces that are curved in a convex shape and a concave shape along the direction CR1, respectively.

[Width, length, and side edges of glass tape]
With reference to FIG. 1, FIG. 3A, and FIG. 3B, the width W, length L, and the side edge 3 of the glass tape 1 are demonstrated. FIG. 3A is a front view schematically showing the glass tape 1. FIG. 3B is an enlarged view of region 11 of FIG. 3A. The width W is a length between a line (hereinafter, referred to as “tangent”) C between the two side edges 3 and the flat surface 7 (a length along a direction perpendicular to the two side edges 3). is there. The length L is the length of the tangent C (the length along the side edge 3). The width W is shorter than the length L. That is, the glass tape 1 satisfies W <L. The side edge 3 is along the longitudinal direction of the glass tape 1.

The side edge 3 has a convex curved surface 4 protruding toward the outside of the glass tape 1. In addition, at the

corners

3a and 3b at the four corners in the sectional view, the two side edges 3 are smoothly connected to the second main surface F2 and the first main surface F1, respectively. Further, the two side edges 3 are connected to the second main surface F2 and the first main surface F1, respectively, so that each angle of the corner portion 3a and the corner portion 3b becomes an obtuse angle. As a result, it is possible to prevent stress from concentrating on the

corners

3a and 3b at the four corners in the sectional view. Moreover, generation | occurrence | production of a chip and a crack can be prevented. As a result, the glass tape 1 can be bent with a large curvature.

Define XYZ coordinates. In this specification, the X-axis direction is a direction perpendicular to the tangent line C and parallel to the flat surface 7. The Y-axis direction is a direction parallel to the tangent line C. The Z-axis direction is a direction orthogonal to the X-axis direction and the Y-axis direction. Therefore, the width W is substantially equal to the length of the glass tape 1 along the X-axis direction. The length L is the length of the glass tape 1 along the Y-axis direction.

[Bending of glass tape in one direction and capillary action]
The bending of the glass tape 1 in one direction will be described with reference to FIGS. 1 and 3A. The glass tape 1 is curved in one direction over the two side edges 3 with respect to the width direction. In this specification, a curve in a plurality of directions is defined as “waviness” and is distinguished from a curve in one direction.

The degree of curvature in one direction of the glass tape 1 is represented by a curvature rate R. The curvature R (%) is defined by the following equation using the width W and the maximum height H of the glass tape 1.

R = (H / W) × 100

In Embodiment 1, the width W and the maximum height H are measured by placing the glass tape 1 so that the two side edges 3 are in contact with the flat surface 7 of the glass plate 5. Therefore, the width W is the length (shortest distance) between the two tangents C. The maximum height H is the length of a perpendicular line extending from the bottom BM of the second main surface F2 (curved surface) facing the flat surface 7 to the flat surface 7.

In Embodiment 1, the glass tape 1 is used by being disposed on the flat surface 7. And when the glass tape 1 is arrange | positioned so that the two side edges 3 may contact | abut to the flat surface 7, it is accompanying that a liquid is inject | poured into the space 9 between the glass tape 1 and the flat surface 7. It is curved with a curvature R enough to cause capillary action. That is, the curvature R is set to a value that causes capillary action when liquid is injected into the space 9. For example, the curvature rate R is 0.001% or more and 1.0% or less. In order to effectively generate a capillary phenomenon, it is preferable that the curvature R approaches 0.001%. On the other hand, when the curvature rate R is smaller than 0.001%, there is a possibility that optical contact occurs.

A preferable first example and second example of the glass tape 1 that easily causes capillary action are as follows. In the first example, the glass tape 1 has a mass% of SiO ₂ 60 to 70%, B ₂ O ₃ 10 to 20%, Al ₂ O ₃ 0 to 10%, CaO 0 to 10%, ZnO 0 to 10%, Sb. ₂

O

₃ 0 <1% composition. In the second example, the glass tape 1 has a composition of SiO ₂ 55 to 65%, Al ₂ O ₃ 13 to 18%, B ₂ O ₃ 8 to 13%, RO (MgO + CaO + SrO + BaO) 10 to 20% by mass. contains.

Next, the advantages of the capillary phenomenon will be described. The capillary phenomenon is used for temporarily fixing the glass tape 1 to the glass plate 5 after the positioning operation of the glass tape 1 on the glass plate 5 is completed. That is, the liquid injected into the space 9 from one end of the space 9 quickly reaches the other end of the space 9 by capillary action. As a result, the glass tape 1 is temporarily fixed to the glass plate 5 by the surface tension of the liquid. Moreover, it can suppress that a bubble enters between the glass tape 1 and the glass plate 5. FIG. Accordingly, the glass tape 1 is arranged such that the two side edges 3 are in contact with the glass plate 5 (flat surface 7), and liquid is injected into the space 9 with the glass plate 5 (flat surface 7). And are preferably curved so as to cause capillary action. As a result, for example, when the glass tape 1 is used as a member that defines the thickness of a product or space (hereinafter referred to as a “thickness defining member”), the positioning accuracy of the thickness defining member can be improved. The thickness defining member is, for example, a gap material, a spacer material, a seal material, or the like.

The glass tape 1 is not limited to the presence or absence of undulation, but it is more preferable that the glass tape 1 does not have undulation. A glass tape having waviness is placed on a glass plate, and a liquid is injected and temporarily fixed. When the glass tape has undulations, a portion other than the side edge may come into contact with the glass plate before liquid injection. For example, when the glass tape 1 is in line contact with the glass plate at x (x is an integer of 1 or more) other than the side edges, (x + 1) spaces where liquid can be injected are formed. When the liquid is injected, if the volume of the space into which the liquid can be injected is different, the liquid injection amount may be non-uniform, and the temporarily fixed strength may be non-uniform.

Further, even if the volume of the space into which the liquid can be injected is the same, if the liquid injection position is shifted to one of the injectable spaces, the liquid injection amount may be non-uniform. Fixing strength may be uneven. Furthermore, if the amount of liquid injected is non-uniform, bubbles may enter the space. Air bubbles reduce the strength of temporary fixing and reduce the positioning accuracy of the glass tape 1. Therefore, it is preferable that the glass tape 1 does not have such a swell that portions other than the two side edges 3 are in contact with the glass plate 5 (flat surface 7).

(Embodiment 2)
A manufacturing method according to Embodiment 2 of the present invention will be described with reference to FIGS. FIG. 4 is a flowchart showing a manufacturing method for manufacturing the glass tape 1 according to the first embodiment. This manufacturing method includes a heating step S1, a stretching step S3, and a bending step S5. In the heating step S1, a plate-shaped mother glass (hereinafter referred to as “mother glass plate”) (not shown) is heated. In the stretching step S3, the heated mother glass plate is stretched and formed into a basic glass tape (not shown) having a thickness Db, a width Wb, and a length Lb and satisfying Db <Wb. In the bending step S5, a basic glass tape having two side edges at both ends in the width direction is bent in one direction across the two side edges. As a result, the glass tape 1 curved in one direction is manufactured.

In Embodiments 2 to 7, the glass tape before bending in the bending step S5 is defined as “basic glass tape” and is distinguished from the glass tape 1.

(Embodiment 3)
With reference to FIG. 1, FIG. 3A, and FIG. 5, the product manufacturing method in Embodiment 3 of this invention is demonstrated. FIG. 5 is a flowchart showing a product manufacturing method. The product manufacturing method is a method for manufacturing a product (hereinafter referred to as “final product”) including the glass tape 1 and the glass plate 5 (first glass plate) of Embodiment 1 as members. The product manufacturing method includes steps S11 and S13. In step S <b> 11, the glass tape 1 is placed on the glass plate 5 so that the two side edges 3 of the glass tape 1 are in contact with the glass plate 5. At this time, the entire two side edges 3 are preferably in contact with the flat surface 7 of the glass plate 5, but there may be a portion that is not in contact with the flat surface 7 of the glass plate 5.

In step S13, a liquid is injected into the space 9 between the glass tape 1 and the flat surface 7. The glass tape 1 is temporarily fixed to the glass plate 5 with a liquid filled in the space 9 by capillary action. The liquid is, for example, a non-volatile liquid (for example, water) or a volatile liquid (for example, alcohol). In the case of using a volatile liquid, it is possible to save the trouble of drying the liquid at the time of final bonding after temporary fixing.

In step S15, the glass plate 5 and the glass tape 1 are processed according to the final product. The glass tape 1 is used, for example, as a thickness regulating member for the final product. In this case, process S15 includes the process of arrange | positioning on the glass tape 1 the glass plate (2nd glass plate) (not shown) different from the glass plate 5 (1st glass plate). The final product is, for example, a product including two or more glass substrates and a thickness regulating member disposed between the two glass substrates (for example, a solar cell, an organic EL (Electro Luminescence) display, a preparation, etc.) It is. In the final product, the glass tape 1 is not curved, has a shape having a flat surface, and functions as a thickness regulating member.

When the glass tape 1 is used as a solar cell thickness regulating member, four glass tapes 1 are arranged along the four sides of the rectangular first glass substrate (step S11). Then, the four arranged glass tapes 1 are temporarily fixed by liquid injection (step S13). Further, a solar cell substrate or the like is disposed in an area surrounded by four glass tapes 1, and a second glass substrate having substantially the same shape as the first glass substrate is placed on the four glass tapes 1. The first glass substrate and the second glass substrate are bonded to each other by applying heat or the like (step S15).

When the glass tape 1 is used as a thickness regulating member for a preparation, the two glass tapes 1 are arranged along the two long sides of the rectangular third glass substrate (step S11). Then, two glass tapes are temporarily fixed to the third glass substrate by liquid injection (step S13). Further, the specimen is left still between the two glass tapes 1, and the glass tape 1 is sandwiched between the third glass substrate and the rectangular fourth glass substrate (step S15).

As described above, according to the third embodiment, the final product can be manufactured by effectively utilizing the characteristics of the glass tape 1 curved in one direction.

(Embodiment 4)
With reference to FIG. 1, FIG. 3A, FIG. 6, and FIG. 7, the manufacturing apparatus 23 in Embodiment 4 of this invention is demonstrated. FIG. 6 is a longitudinal side view showing a schematic configuration of the manufacturing apparatus 23. FIG. 7 is a diagram for explaining temperature control by the manufacturing apparatus 23.

The manufacturing apparatus 23 is a heating apparatus for manufacturing the glass tape 1 according to the first embodiment. The manufacturing apparatus 23 includes a furnace 25, a heater 27, a mold 29, a heater 33, and a heater 35. The mold 29 includes a template 29A and a template 29B. The heater 27 and the mold 29 are disposed in the furnace 25. The heater 33 is disposed outside the inlet 36. The heater 35 is disposed outside the outlet 41. The inlet 36 and the outlet 41 are formed on one side and the other side of the furnace 25, respectively. A supply path 31 for filling the nitrogen gas is formed in the furnace 25.

First, the atmosphere in the furnace 25 will be described. In a period s0 from time t0 to time t1 and a period s3 from time t3 to time t4, the furnace 25 is filled with nitrogen (N ₂ ) gas. In the period s1 from time t1 to time t2 and in the period s2 from time t2 to time t3, the inside of the furnace 25 is evacuated.

Next, the load applied by the mold 29 will be described. The basic glass tape 37 is sandwiched with the specified load P by the template 29A and the template 29B until the temperature raising step. In addition, the main surface F3 (first main surface) and the main surface F4 (second main surface) of the basic glass tape 37 are arranged to face each other. The main surface F3 and the main surface F4 are orthogonal to the vertical line. Further, in the template 29A, the surface facing the main surface F3 is a flat surface. In the template 29B, the surface facing the main surface F4 is a flat surface.

Next, temperature control will be described. The temperature curve 53 shows the ambient temperature around the principal surface F3. A temperature curve 54 shows the ambient temperature around the main surface F4. The basic glass tape 37 is preheated from room temperature to a temperature T0 by the heater 33, and then conveyed along the conveyance direction 38 from the inlet 36 to the template 29A and the template 29B. Then, the basic glass tape 37 is sandwiched between the template 29A and the template 29B.

The main surface F3 side is heated from the temperature T0 to the temperature T1 by the heater 27 in the period s0 (temperature raising step). And the main surface F3 side is hold | maintained by the heater 27 at temperature T1 in the period s1 (heat retention process). Further, the main surface F3 side is gradually cooled from the temperature T1 to the temperature T3 under the temperature control by the heater 27 in the period s2 (gradual cooling step).

On the other hand, the main surface F4 side is heated from the temperature T0 to the temperature T2 by the heater 27 in the period s0 (temperature raising step). The main surface F4 side is held at the temperature T2 by the heater 27 in the period s1 (heat retention step). Further, the main surface F4 side is gradually cooled from the temperature T2 to the temperature T3 under the temperature control by the heater 27 in the period s2 (gradual cooling step).

The main surface F3 side and the main surface F4 side are cooled from the temperature T3 to the temperature T0 under the temperature control by the heater 27 in the period s3 (cooling step). At time t4, the template 29A and the template 29B release the load. From the above, at least the temperature raising step, the heat retaining step, and the slow cooling step are performed with the basic glass tape 37 sandwiched between the molds 29.

Then, the basic glass tape 37 is conveyed from the outlet 41 to the outside of the furnace 25 along the conveying direction 38, is subjected to temperature control by the heater 35, and is gradually cooled from the temperature T0 to room temperature. The basic glass tape 37 after the slow cooling is convexly curved in the vertically upward direction.

As described above, by changing the rate of temperature increase between the main surface F3 side and the main surface F4 side (period s0) and gradually cooling from different temperatures (T1, T2) to the same temperature (T3) in the same time (period s2). The basic glass tape 37 is curved in one direction. That is, the glass tape 1 is manufactured from the basic glass tape 37.

The temperature T0 may be room temperature. In this case, the functions of the heater 33 and the heater 35 are stopped. Alternatively, the heater 33 and the heater 35 may not be provided.

(Embodiment 5)
A manufacturing method according to Embodiment 5 of the present invention will be described with reference to FIGS. 1, 3A, 4, and 6 to 8. FIG. This manufacturing method is executed using the manufacturing apparatus 23. The manufacturing method is the same as the manufacturing method according to the second embodiment described with reference to FIG. FIG. 8 is a flowchart showing the bending step S5 according to the fifth embodiment.

In step S51, first, the basic glass tape 37 is sandwiched between the molds 29. In steps S53 to S57, the heater 27 is controlled to perform temperature control. Steps S53 to S57 are performed in a state where the basic glass tape 37 is sandwiched between the molds 29.

In step S53 (temperature raising step), the atmospheric temperature on the main surface F3 side and the atmospheric temperature on the main surface F4 side of the basic glass tape 37 are the temperature T1 (first temperature) and the temperature T2 (in the period s0 (first period), respectively. The main surface F3 side and the main surface F4 side are heated at different heating rates so as to reach the second temperature.

In step S55 (heat retention step), during the period s1 (second period), the atmospheric temperature on the main surface F3 side and the atmospheric temperature on the main surface F4 side are maintained at the temperature T1 and the temperature T2, respectively. In step S57 (slow cooling step), the atmospheric temperature on the main surface F3 side held at the temperature T1 and the atmospheric temperature on the main surface F4 side held at the temperature T2 are respectively the temperature T3 (first time) in the period s2 (third period). The main surface F3 side and the main surface F4 side are slowly cooled at different cooling rates so as to reach (3 temperatures).

(Common items of Embodiment 6 and Embodiment 7)
In the sixth embodiment and the seventh embodiment of the present invention, the manufacturing method is executed by the manufacturing apparatus 23. However, the temperature control shown in FIG. 7 is not performed. The manufacturing method is the same as the manufacturing method according to the second embodiment described with reference to FIG. 4. However, in step S5 of the sixth and seventh embodiments in FIG. The difference is that the atmospheric temperature on the main surface F3 side and the atmospheric temperature on the main surface F4 side sandwiched between the metal mold 39 or the metal mold 29 in FIG. 6 are maintained at the same temperature (for example, 620 ° C.).

(Embodiment 6)
A manufacturing method according to Embodiment 6 of the present invention will be described with reference to FIGS. 1, 3A, 4, 6, and 9. FIG. FIG. 9 is a front view schematically showing a mold 39 used in the manufacturing method. A mold 39 is used in place of the mold 29 of the manufacturing apparatus 23. The mold 39 includes a template 39A and a template 39B. In the template 39A, the contact surface (molding surface) with the main surface F3 is a concave surface curved in one direction. In the template 39B, the contact surface (molding surface) with the main surface F4 is a convex surface curved in the same direction as the contact surface of the template 39A.

In step S5, the basic glass tape 37 is sandwiched between the curved molds 39 while the basic glass tape 37 is heated by the heater 27. As a result, the basic glass tape 37 bends in one direction according to the shape of the mold 39.

Thus, the glass tape 1 is manufactured from the basic glass tape 37 through the steps S1 to S5.

(Embodiment 7)
With reference to FIG. 1, FIG. 3A, FIG. 4, and FIG. 6, the manufacturing method in Embodiment 7 of this invention is demonstrated. Step S5 includes a first step and a second step. In the first step, the basic glass tape 37 is sandwiched between the molds 29 while the basic glass tape 37 is heated by the heater 27.

In the second step, the heater 35 is controlled to slowly cool the main surface F3 side and the main surface F4 side of the basic glass tape 37 coming out of the mold 29 at different slow cooling rates (cooling rate). Specifically, the cooling is performed so that the gradual speed on the main surface F4 side becomes larger than the gradual cooling speed on the main surface F3 side. The basic glass tape 37 after the slow cooling is convexly curved in the vertically upward direction. In this way, the gradually cooled basic glass tape 37 is curved in one direction by making the slow cooling rate different between the main surface F3 side and the main surface F4 side.

Next, with reference to FIG. 6 and FIG. 10, detailed control by the manufacturing method in Embodiment 7 will be described. FIG. 10 is a diagram for explaining temperature control by the manufacturing method.

The temperature curve 63 shows the ambient temperature around the main surface F3. A temperature curve 64 shows the ambient temperature around the main surface F4. In the period s10 (time t10 to time t11), the period s11 (time t11 to time t12), and the period s12 (time t12 to time t13), the heater 27 is controlled to execute temperature control. In the period s13 (time t13 to time t14), the period s14 (time t14 to time t15), the period s15 (time t15 to time t16), and the period s16 (time t16 to time t17), the heater 35 is controlled to control the temperature. Execute control.

The basic glass tape 37 is conveyed along the conveyance direction 38 between the template 29A and the template 29B from the inlet 36. The template glass 29A and the template 29B sandwich the basic glass tape 37 before the temperature raising step.

The main surface F3 side is heated from the temperature T0 to the temperature T11 in the period s10 (temperature increasing step on the main surface F3 side). And the main surface F3 side is hold | maintained at the temperature T11 in the period s11 and the period s12 (The heat retention process by the side of the main surface F3). On the other hand, the main surface F4 side is heated from the temperature T0 to the temperature T11 in the period s10 and the period s11 (temperature increasing step on the main surface F4 side). And the main surface F4 side is hold | maintained at temperature T11 in the period s12 (main surface F4 side heat retention process).

At time t13, the template 29A and the template 29B release the load. Then, the basic glass tape 37 is transported from the outlet 41 to the outside of the furnace 25 along the transport direction 38. The transport time in this case is negligible because it is so short that it does not affect the temperature control of the basic glass tape 37.

The main surface F3 side is gradually cooled from the temperature T11 to the temperature T12 in the period s13 and the period s14 (the slow cooling process on the main surface F3 side). Further, the main surface F3 side is cooled from the temperature T12 to the temperature T0 in the period s15 and the period s16 (the cooling process on the main surface F3 side). On the other hand, the main surface F4 side is gradually cooled from the temperature T11 to the temperature T12 in the period s13 (the slow cooling process on the main surface F4 side). Further, the main surface F4 side is cooled from the temperature T12 to the temperature T0 in the period s14 and the period s15 (cooling process on the main surface F4 side). The basic glass tape 37 after the slow cooling is convexly curved in the vertically upward direction. In this way, the main surface F3 side and the main surface F4 side are heated to the same temperature (T11) at different heating rates (period s10, period s11, period s12), and the main surface F3 side and the main surface F4 side Is gradually cooled at different slow cooling rates (period s13, period s14), the slowly cooled basic glass tape 37 bends in one direction. That is, the glass tape 1 is manufactured from the basic glass tape 37.

Here, in the seventh embodiment, for example, the temperature T0, the temperature T11, and the temperature T12 are room temperature, 620 ° C., and 555 ° C., respectively. Since the temperature T0 is room temperature, the function of the heater 33 is stopped or the heater 33 may not be provided. For example, the period s10, the period s11, the period s12, the period s13, the period s14, the period s15, and the period s16 are 2 minutes, 0.5 minutes, 0.5 minutes, 1.5 minutes, 1.5 minutes, 3.5 minutes and 3.5 minutes. For example, the specified load P by the mold 29 is 0.5 KN (kilonewtons). For example, in the period s10, the furnace 25 is filled with nitrogen (N ₂ ) gas, and in the period s11 and the period s12, the furnace 25 is evacuated.

(Embodiment 8)
With reference to FIG. 1, FIG. 3A, and FIG. 11, the manufacturing method in Embodiment 8 of this invention is demonstrated. FIG. 11 is a longitudinal side view showing a schematic configuration of a manufacturing apparatus 43 that executes the manufacturing method. The manufacturing method is the same as the manufacturing method according to the second embodiment described with reference to FIG. 4 except that step S5 is performed in step S3. Details will be described below.

As shown in FIG. 11, the manufacturing apparatus 43 includes a holding unit 45, a heater 47, and a drum 49. The mother glass plate 51 is set on the holding portion 45 along a vertical line. In step S1, the heater 47 is controlled to heat the main surface F5 (first main surface) side and the main surface F6 (second main surface) side of the mother glass plate 51 at different temperatures. For example, the atmospheric temperature on the main surface F5 side is set to a temperature T20 (for example, 720 ° C.), and the atmospheric temperature on the main surface F6 side is set to a temperature T21 (for example, 700 ° C.). The temperature T20 is higher than the temperature T21. In step S3 (step S5), the heated mother glass plate 51 is stretched and formed into the glass tape 1 by the rotational force (tensile force) of the drum 49 in the arrow direction 55. As a result, the glass tape 1 bends in one direction across the two side edges 3.

As described above, since the main surface F5 side and the main surface F6 side of the mother glass plate 51 are stretched while being heated at different temperatures, the glass tape 1 obtained in the step S3 is made so that the main surface F5 side is convex. Curve in the direction. That is, the glass tape 1 is manufactured directly from the mother glass plate 51.

[Basic glass tape]
The manufacturing method of the basic glass tape (base glass tape 37) demonstrated with reference to FIG. 4 is demonstrated. Hereinafter, a manufacturing method by the redraw method will be described with reference to FIGS. 3A, 3 </ b> B, 4, and 11. In step S1, the heater 47 is controlled to heat the main surface F5 and the main surface F6 of the mother glass plate 51 set on the holding unit 45 at the same temperature (for example, 710 ° C.). In step S <b> 3, the base glass tape is formed by stretching the heated mother glass plate 51 and wound around the drum 49.

The main surface and side edges of the basic glass tape formed by the redraw method are fire-polished surfaces. As a result, the 1st main surface F1 and the 2nd main surface F2 of the glass tape 1 manufactured from the basic glass tape, and the side edge 3 also become a fire-making surface. Moreover, the side edge of the basic glass tape shape | molded by the redraw method has a convex curved surface which protrudes toward the outer side of a basic glass tape. As a result, the side edge 3 of the glass tape 1 manufactured from the basic glass tape also has a convex curved surface 4 that protrudes outward. These points are the same for the glass tape 1 of the eighth embodiment.

The shape of the formed basic glass tape is preferably substantially flat and has no curvature (including waviness), but in the bending step (S5), it is curved in one direction. I do not care.

(Embodiment 9)
With reference to FIG. 2 and FIGS. 12A to 12D, a glass tape 1 according to Embodiment 9 of the present invention will be described. As shown in FIG. 2, the glass tape 1 according to the first embodiment is curved in one direction (direction CR1) so that the second main surface F2 has one bottom BM over the two side edges 3. The main surface F1 is curved along the second main surface F2.

On the other hand, the glass tape 1 according to the first to third examples of the ninth embodiment extends in two or more directions (directions) so that the second main surface F2 has the top TM and the bottom BM over the two side edges 3. CR1 and direction CR2), and the first main surface F1 is curved along the second main surface F2. That is, the glass tape 1 has a wave. The undulation indicates the bending in a plurality of directions, that is, the second main surface F2 is bent in two directions so as to have the top part TM and the bottom part BM. In the present specification, the top portion TM indicates a vertex of the convex second main surface F2 in a cross-sectional view. The top TM is formed along the side edge 3.

FIG. 12A is a cross-sectional view showing a glass tape 1 according to a first example of Embodiment 9. FIG. The glass tape 1 is curved in two directions (direction CR1 and direction CR2), and the second main surface F2 has one top TM and one bottom BM. The bottom BM is a bottom that is concave toward the direction CR1, and the top TM is a top that is convex toward the direction CR2. A center plane CF passing through the two side edges 3 is curved. The first main surface F1 is curved along the second main surface F2. One side edge 3 and one top TM of the glass tape 1 are in contact with the flat surface 7. That is, the glass tape 1 contacts the flat surface 7 at two contact points CP in a cross-sectional view.

In the glass tape 1 according to the first example, two-point contact is made in a sectional view. That is, the glass tape 1 and the glass plate 5 are in line contact. Since it is a line contact, the contact area of the glass tape 1 and the glass plate 5 is small compared with the case of surface contact. As a result, the occurrence of optical contact can be suppressed, and the positioning operation of the glass tape 1 on the glass plate 5 can be easily performed.

However, since the space 9 is shifted toward the one side edge 3, when the liquid 9 is injected into the space 9 and temporarily fixed, the strength of the temporary fixing may be uneven. Therefore, it is more preferable to form the glass tape 1 so that the space 9 is line symmetric.

FIG. 12B is a cross-sectional view showing the glass tape 1 according to the second example of the ninth embodiment. The glass tape 1 is curved in two directions (direction CR1 and direction CR2), and the second main surface F2 has one top portion TM and two bottom portions BM. The top part TM is a top part convex toward the direction CR2, and each bottom part BM is a bottom part concave toward the direction CR1.

The glass tape 1 is curved so as to be line symmetric with respect to a line passing through the central top TM and perpendicular to the flat surface 7. Therefore, the space 9 is line symmetric. A center plane CF passing through the two side edges 3 is curved. The first main surface F1 is curved along the second main surface F2. The two side edges 3 of the glass tape 1 and the central top part TM are in contact with the flat surface 7, and the two bottom parts BM are separated from the flat surface 7. That is, the glass tape 1 contacts the flat surface 7 at three contact points CP in a cross-sectional view.

In the glass tape 1 according to the second example, as in the glass tape 1 according to the first example, generation of optical contact can be suppressed by line contact. In addition, since the glass tape 1 is formed so that the space 9 is line-symmetric, non-uniformity in the strength of temporary fixing by the liquid can be suppressed.

FIG. 12C is a cross-sectional view showing a glass tape 1 according to a third example of Embodiment 9. The configuration of the glass tape 1 is the same as the configuration of the glass tape 1 according to the second example. However, the top TM of the second main surface F2 is away from the flat surface 7 and is not in contact with the flat surface 7. The two side edges 3 of the glass tape 1 are in contact with the flat surface 7. That is, the glass tape 1 contacts the flat surface 7 at two contact points CP in a cross-sectional view.

In the glass tape 1 according to the third example, similarly to the glass tape 1 according to the second example, the occurrence of optical contact can be suppressed by line contact, and the space 9 is made linearly symmetrical by making the line 9 symmetrical. Unevenness of strength can be suppressed. Further, since the central top portion TM is separated from the flat surface 7, the liquid is injected over the entire space 9. Therefore, it is possible to further suppress the bubbles from entering the space 9 into which the liquid has been injected while further suppressing the non-uniformity of the temporarily fixed strength.

As described with reference to FIGS. 12A to 12C, the glass tape 1 according to the first to third examples of the embodiment 9 has waviness. However, the shape of the undulation (the number of the top TM, the presence or absence of contact of the top TM with the flat surface 7 and the number of the bottom BM) is not limited to the undulation of the glass tape 1 according to the first to third examples. .

The smaller the number of tops TM of the second main surface F2, the better. This is because it is possible to further improve the uniformity of the strength of temporary fixation by liquid injection, further suppress the entry of bubbles, and further improve the positioning accuracy of the glass tape 1.

In addition, even when the top portion TM is in contact with the flat surface 7, the smaller the number of contact points CP, the better. For example, the number of contact points CP is preferably 3, and more preferably 2.

However, it is more preferable that the glass tape 1 according to the first embodiment is curved in one direction and has no swell. That is, it is preferable that the number of bottom portions BM of the second main surface F2 is 1 and the number of top portions TM is 0. This is because the uniformity of the strength of temporary fixation by liquid injection can be further improved, air bubbles can be further prevented from entering, and the positioning accuracy of the glass tape 1 can be further improved.

The glass tape 1 according to the first embodiment has not only waviness, but is curved so that the first main surface F1 is along the second main surface F2. However, the glass tape 1 may not be curved so that the first main surface F1 is along the second main surface F2.

FIG. 12D is a cross-sectional view showing a glass tape 1 according to a fourth example of the ninth embodiment. The glass tape 1 has thick portions G at both ends of the glass tape 1. The thickness of each thick part G is larger than the thickness of the central part of the glass tape 1. The center plane CF passing through the two side edges 3 is curved. Furthermore, in the center part of the glass tape 1, the 1st main surface F1 is curving so that the 2nd main surface F2 may be followed. Moreover, the glass tape 1 has the one bottom part BM similarly to the glass tape 1 which concerns on Embodiment 1, and contacts the flat surface 7 at the two contact points CP in the cross sectional view. In the glass tape 1 which concerns on a 4th example, generation | occurrence | production of an optical contact can be suppressed by line contact similarly to the glass tape 1 which concerns on Embodiment 1. FIG.

Next, the present invention will be specifically described based on examples, but the present invention is not limited to the following examples.

Embodiments of the present invention will be described with reference to FIG. 1, FIG. 3A, FIG. 6, FIG. 7, and FIG. FIG. 13 is a diagram for explaining the glass tape 1 in the embodiment. The horizontal axis and the vertical axis indicate the position along the X axis and the height along the Z axis of the glass tape 1, respectively. The height is a height from the flat surface 7 to the second main surface F2 (curved surface).

In the examples, the glass tape 1 manufactured from the basic glass tape 37 by the manufacturing apparatus 23 according to the fourth embodiment is shown. The material of the mother glass plate of the basic glass tape 37 is non-alkali glass (Type A manufactured by Nippon Electric Glass Co., Ltd.). The mother glass plate has a width of 50 mm and a thickness of 0.3 mm. The basic glass tape 37 manufactured by the redraw method has a width of 5 mm and a thickness of 0.03 mm.

The conditions of time, temperature, and load in the manufacturing process are as follows. The period s0, the period s1, the period s2, and the period s3 are 1 minute, 1 minute, 3 minutes, and 3 minutes, respectively. The specified load P is 0.5 KN. The temperature T0, the temperature T1, the temperature T2, and the temperature T3 are room temperature, 630 ° C., 610 ° C., and 555 ° C., respectively.

Under the above conditions, the glass tape 1 curved in one direction shown in FIG. 13 was produced. The curvature R was 0.07%. Moreover, the width W of the glass tape 1 is 5 mm, and thickness is 0.03 mm. Use of alkali-free glass is suitable as a sealing material for a device equipped with an element that deteriorates due to an alkali component.

The base glass plate is borosilicate glass (Type D manufactured by Nippon Electric Glass Co., Ltd.), and the temperature T1, the temperature T2, and the temperature T3 are each set to 150 ° C. higher than that of non-alkali glass. When the glass tape 1 was manufactured on the same conditions as alkali glass, the glass tape 1 which has the curvature R equivalent to alkali-free glass was able to be manufactured.

Note that the present invention is not limited to the above-described embodiment, and can be implemented in various modes without departing from the gist thereof. For example, the glass tape 1 described with reference to FIGS. 1 to 13 may have the following characteristics.

(1) The material of the glass tape 1 is not particularly limited. For example, the material is a glass that can be stretch-molded, such as silicate glass, alkali-free glass, soda glass, borosilicate glass, aluminum silicate glass, and silica glass, depending on the application.

(2) The width W of the glass tape 1 is not particularly limited. For example, the width W is 25 mm or less, 20 mm or less, 15 mm or less, or 10 mm or less depending on the application.

(3) The glass tape 1 may have an aspect ratio of the width W to the thickness of 25 to 5000. Therefore, it is suitable as a gap material, a spacer material, a seal material and the like.

(4) The surface roughness of the first main surface F1 and / or the second main surface F2 of the glass tape 1 is not particularly limited. For example, the first main surface F1 and / or the second main surface F2 are smooth surfaces on which optical contact can occur. For example, the center line average roughness Ra is 0.5 nm or less, 0.3 nm or less, or 0.2 nm or less depending on the application.

(5) The first main surface F1 and / or the second main surface F2 and / or the side edge 3 of the glass tape 1 may be a fire-making surface. When the 1st main surface F1 and / or the 2nd main surface F2 are fire-making surfaces, adhesiveness with the glass plate 5 improves more and it becomes easy to adhere | attach. When the side edge 3 is a fired surface, the side edge 3 is not cracked, chipped, cracked, or the like, and the glass tape 1 can be effectively prevented from breaking from the side edge 3. As a result, the glass tape 1 can be bent with a large curvature.

(6) As shown in FIG. 3B, the side edge 3 has the convex curved surface 4, but the side edge 3 may be a flat surface. The side edge 3 may be formed of a curved surface and a flat surface.

(7) The glass tape 1 may contain 0.01% by mass to 30% by mass of transition metal ions. The glass tape 1 can be effectively heated by irradiating the glass tape 1 with light having a wavelength that is absorbed by the transition metal ions. As a result, the glass tape 1 temporarily fixed to the glass plate 5 can be softened and bonded to the glass plate 5.

(8) The surface of the glass tape 1 may be subjected to film formation. The surface of the glass plate 5 can be effectively heated by irradiating the glass tape 1 with light having a wavelength that is absorbed by the film component formed on the surface. As a result, the temporarily fixed glass tape 1 and the glass plate 5 can be easily bonded.

(9) The glass tape 1 may contain an alkali metal having a mass of 5% to 25%. This makes it possible to bond the glass tape 1 and the glass plate 5 by anodic bonding.

(10) In the glass tape 1 curved in one direction (for example, the fourth example of the first embodiment or the ninth embodiment) and the glass tape 1 having undulations (for example, the first to third examples of the ninth embodiment), The number of contact points CP is preferably 5 points or less, more preferably 3 points or less, and even more preferably 2 points.

(11) The product manufacturing method in the third embodiment is applied to the glass tape 1 that is curved in one direction across two side edges (for example, the fourth example of the first or ninth embodiment). However, the product manufacturing method according to the third embodiment may be applied to the glass tape 1 that is curved over two side edges. Therefore, for example, the product manufacturing method in the third embodiment manufactures a product (final product) including the glass tape 1 having undulation (for example, the first to third examples of the ninth embodiment) and the glass plate 5 as members. It can also be applied to

(12) In FIG. 12B, the glass tape 1 is curved so as to be symmetrical with respect to a line passing through the central top TM and perpendicular to the flat surface 7, but with respect to a line perpendicular to the flat surface 7. And may be curved to be asymmetric. Similarly, the glass tape 1 of FIGS. 1, 12C, and 12D is curved so as to be line-symmetric with respect to a line perpendicular to the flat surface 7, but with respect to a line perpendicular to the flat surface 7. It may be curved to be asymmetric.

The present invention can be used in fields where glass tape is used as a gap material, a spacer material, a sealing material, etc., such as a solar cell, an organic EL display, and a preparation.

1 Glass Tape 3 Side Edge 4 Convex Curved Surface 5 Glass Plate 7 Flat Surface 9 Space 29 Mold 37 Basic Glass Tape 39 Mold 51 Mother Glass Plate D Thickness W Width L Length Db Thickness Wb Width Lb Length CF Center Plane F1 First 1 Main surface (curved surface)
F2 Second main surface (curved surface)
F3 main surface (first main surface)
F4 main surface (second main surface)
F5 main surface (first main surface)
F6 main surface (second main surface)

Claims

A glass tape having a thickness D, a width W, and a length L and satisfying D <W,
Glass tape curved in the width direction.
The glass tape according to claim 1, which has two side edges and is curved over the two side edges.
The glass tape according to claim 2, which is curved in one direction over the two side edges.
The glass tape according to claim 2 or 3, wherein a center plane passing through the two side edges is curved.
The glass tape according to any one of claims 2 to 4, wherein the side edge has a convex curved surface.
Used on a flat surface,
When the two side edges are arranged in contact with the flat surface, the liquid crystal is bent at a curvature R that causes capillary action when liquid is injected into the space between the flat surfaces. The glass tape according to any one of claims 2 to 5, wherein:
The glass tape according to any one of claims 2 to 6, wherein the curvature R is 0.001% or more and 1.0% or less.
R = (H / W) × 100
H is the length of a perpendicular line extending from the bottom of the curved surface facing the flat surface to the flat surface when the glass tape is disposed so that the two side edges are in contact with the flat surface. .
A first main surface and a second main surface facing the first main surface;
The glass tape according to any one of claims 1 to 7, wherein the first main surface is curved along the second main surface.
The glass tape according to any one of claims 1 to 8, wherein W <L is satisfied.
A heating step for heating the mother glass plate;
Stretching the heated mother glass plate, having a thickness Db, a width Wb, and a length Lb, and stretching the base glass tape to satisfy Db <Wb;
A bending step of bending the basic glass tape having two side edges at both ends in the width direction in one direction over the two side edges.
The bending step includes
Sandwiching the basic glass tape with a mold;
The first main surface side and the second main surface side so that the atmospheric temperature on the first main surface side and the second main surface side of the basic glass tape reach the first temperature and the second temperature in the first period, respectively. A step of raising the temperature of the two principal surfaces at a different rate of temperature rise;
Maintaining the atmospheric temperature on the first main surface side and the atmospheric temperature on the second main surface side at the first temperature and the second temperature, respectively, during the second period;
The atmospheric temperature on the first main surface side held at the first temperature and the atmospheric temperature on the second main surface side held at the second temperature reach the third temperature in the third period, respectively. And gradually cooling the first main surface side and the second main surface side at different slow cooling rates,
The glass tape manufacturing method according to claim 10, wherein the temperature raising step, the holding step, and the slow cooling step are performed in a state where the basic glass tape is sandwiched between the molds.
The glass tape manufacturing method according to claim 10, wherein the bending step includes a step of sandwiching the basic glass tape with a curved mold while heating the basic glass tape.
The bending step includes
While heating the basic glass tape, sandwiching the basic glass tape with a mold,
The glass tape manufacturing method of Claim 10 including the process of slowly cooling the 1st main surface side and the 2nd main surface side of the said basic glass tape which came out of the said metal mold | die at a different cooling rate.
The bending step is performed in the stretching step,
The said heating process is a glass tape manufacturing method of Claim 10 including the process of heating the 1st main surface side and the 2nd main surface side of the said mother glass board at different temperature.
A method for producing a product comprising the glass tape according to any one of claims 1 to 9 and a first glass plate as members,
Placing the glass tape on the first glass plate such that two side edges of the glass tape are in contact with the first glass plate;
Injecting a liquid into a space between the glass tape and the first glass plate.
Further comprising placing a second glass plate on the glass tape;
The product manufacturing method according to claim 15, wherein the glass tape functions as a thickness regulating member.