JP2014129189A - Production method of glass laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent lowering of quality of a flat glass by that generation of a warpage of a glass laminate is avoided when producing a glass laminate.SOLUTION: A production method of a glass laminate is that in respective a glass film GF and a support glass GS, surface roughnesses Ra of mating surfaces that become surfaces that contact mutually are made at most 2.0nm, both mating surfaces are surface-contacted, thereby the glass film GF and the support glass GS are superimposed to produce a glass laminate G, and when both mating surfaces are surface-contacted, the support glass GS in which flexural rigidity is large in the glass film GF and the support glass GS is performed by elastic deformation to a bow shape, thereby the mating surface in the support glass GS is bowed to a convex surface.

Description

  The present invention relates to a glass laminate manufacturing method for manufacturing a glass laminate by superimposing two glass plates.

  When manufacturing-related processing is performed on a thin plate glass, a glass laminate is used in which a plate glass and a supporting glass supporting the plate glass are layered for the purpose of facilitating the handling (patent) Reference 1). When manufacturing-related processing is performed using this glass laminate, there are the following advantages.

  For example, in the manufacturing process of flat panel display, which is a typical product that uses thin plate glass, when film processing such as transparent conductive film is applied to plate glass, it has rich flexibility unique to thin plate glass. Since the property can be temporarily excluded and an appropriate adhesion force acts between the laminated glass sheet and the supporting glass, the patterning is not easily displaced.

  Furthermore, in order to create adhesion between the plate glass and the support glass, it is not necessary to attach an adhesive or the like. Therefore, when incorporating the plate glass after manufacturing-related processing into various devices, it is easy to use it from the support glass. It is possible to obtain a plate glass that can be peeled off and has no contamination due to the remaining adhesive or the like.

JP 2011-183792 A

  However, there are still problems to be solved in such a useful glass laminate. That is, after the stacking operation of the plate glass on the supporting glass is completed, the glass laminate may be warped as shown in FIG.

  And when such a curvature arises in the glass laminated body G, the adsorption | suction error of a conveyance robot, the slip by a conveyance conveyor, meandering, etc. will arise. For this reason, there has been a problem that an appropriate manufacturing-related process cannot be performed on the plate glass G2 supported by the support glass G1, and the quality of the peeled plate glass G2 used as a product is deteriorated.

  Therefore, in order to solve such a problem, when the sheet glass G2 is superimposed on the support glass G1, attempts have been made to superimpose the sheet glass G2 while correcting it to a flat state using a roller or the like. However, even when such measures are implemented, not only the warp of the glass laminate G is not eliminated, but also the result is further promoted.

  In addition, such a problem does not arise only when the plate glass and the supporting glass are overlapped, but when the plate glass and the glass laminate are overlapped, the glass laminates are overlapped with each other. In addition, when a glass laminate is produced by superimposing plate glass as its constituent elements, it may occur in the same manner.

  This invention made | formed in view of the said situation is technical in preventing the fall of the quality of the plate glass obtained by peeling from this by avoiding generation | occurrence | production of the curvature in a glass laminated body, when manufacturing a glass laminated body. Let it be an issue.

  The present invention created in order to solve the above-mentioned problems, in each of the two glass plate bodies having a flat plate shape, the surface roughness Ra of the mating surface to be a surface in contact with each other is 2.0 nm or less, A method for producing a glass laminate in which the two mating surfaces are brought into surface contact with each other to produce a glass laminate in which the two glass plates are superposed. Of the two glass plates, the glass plate having the larger bending rigidity is elastically deformed into a curved shape, whereby the mating surface of the glass plate is curved into a convex curved surface. Here, the “glass plate” includes not only the plate glass but also a plate glass as its constituent element, for example, a glass laminate in which two or more plate glasses are stacked.

  When two glass plates are overlapped, an adhesion force is generated between the mating surfaces by surface contact of the mating surfaces having a surface roughness Ra of 2.0 nm or less. Thus, it is considered that the adhesion force generated between the mating surfaces without using an adhesive or the like is caused by hydrogen bonding. In addition, between the two mating surfaces, it is considered that the force of one glass plate attracting the other glass plate is equal to the force of the other glass plate attracting the one glass plate. . From the above viewpoint, when both of the two glass plates are stacked in a flat state, whether or not the glass laminate is warped is determined by the ease of bending deformation between the two glass plates, that is, It is considered that it is governed by whether there is a difference in bending rigidity. And when there is a difference between the bending stiffnesses of the two glass plates, the mating surface in the glass plate with the smaller bending stiffness among the two glass plates stacked under a flat condition. Is curved to a convex curved surface, and the mating surface of the glass plate having the larger bending rigidity is curved to a concave curved surface. From these facts, when the glass plate having the larger bending rigidity is curved in advance by elastic deformation so that the mating surface of the glass plate becomes a convex curved surface, the two glass plates are overlapped. The difference in bending rigidity between the glass plates was apparently eliminated, and a glass laminate that was substantially flat and free from warping could be produced. Here, when two glass plates are overlapped and the mating surfaces of both are brought into surface contact, the elastic deformation is released from the state in which the glass plate having the larger bending rigidity is bent by elastic deformation. As the plate becomes closer to a flat plate shape, the surface contact area between the two may be gradually widened, or the glass plate having the larger bending rigidity is kept curved by elastic deformation. The surface contact area between the two may be gradually expanded. And, after the glass laminate without warp is manufactured, it is confirmed that the plate glass obtained by peeling from this glass laminate does not warp and can be used as a product without any problems. Met. From the above, according to such a method, when a glass laminate is produced by overlapping glass plates, it is possible to avoid the occurrence of warpage in the glass laminate, and thus the quality of the plate glass obtained by peeling from the glass laminate. It is possible to prevent a decrease in the above. The shape of the convex curved surface may be a spherical surface (including a substantially spherical surface), an elliptical surface (including a substantially elliptical surface), a cylindrical surface (including a substantially cylindrical surface), or the like.

  In the above method, of the two glass plates, the thickness of the glass plate having the smaller bending rigidity is 200 μm or less, the thickness of the glass plate having the larger bending stiffness is 300 μm or more, and It is preferable that it is 1.1 mm or less.

  Thus, when the plate thickness of the glass plate with the smaller bending rigidity is 200 μm or less, and the plate thickness of the glass plate with the larger bending stiffness is 300 μm or more and 1.1 mm or less, The effect of can be acquired more suitably.

  In the above method, the two glass plates are preferably formed of the same material.

  In this way, when the size (vertical and horizontal dimensions) of the two glass plates is the same, the glass plate having the larger bending rigidity is more plate-like than the glass plate having the smaller bending stiffness. Since the thickness is increased, it is only necessary to elastically deform the glass plate having the larger thickness in a curved shape.

  In the above method, of the two glass plates, the glass plate having the smaller bending rigidity is placed on a plane, and the glass plate having the larger bending rigidity is placed on the one having the smaller bending rigidity. After supporting the glass plate body so as to be elastically deformable at a position spaced apart from the glass plate body, the mating surface of the glass plate body having the larger bending rigidity is curved downward into a convex curved surface, thereby bringing the two mating surfaces into surface contact. You may let them. Here, the term “support” includes not only the case where the glass plate having the higher bending rigidity is supported and supported from below, but also the case where the glass plate is supported by being suspended from above.

  In this way, the mating surface of the glass plate having the larger bending rigidity is in a convexly curved downward direction and is in surface contact with the mating surface of the glass plate having the smaller bending rigidity. Both glass plate bodies can be manufactured to be a glass laminate that is substantially flat and has no warpage.

  In the above method, of the two glass plates, the glass plate having the larger bending rigidity is placed on a convex curved surface having a suction hole for adsorbing the glass plate, and the glass plate By adsorbing, the curved surface of the mating surface is curved upward to form a convex curved surface, and then the mating surface of the glass plate body with the smaller bending rigidity and the mating surface of the glass plate body with the larger bending rigidity. The surface may be brought into surface contact.

  In this way, the mating surface of the glass plate having the larger bending rigidity placed on the convex curved surface and adsorbed to the suction hole is deformed following the shape of the convex curved surface, and thus upwards Curves convexly. After that, if the mating surface of the glass plate and the mating surface of the glass plate having the smaller bending rigidity are brought into surface contact, both glass plates are substantially flat and have no warpage. Can be manufactured. In this case, when the two glass plates are overlapped and the mating surfaces of the two are brought into surface contact, the adsorption force is reduced from the state in which the glass plate having the larger bending rigidity is bent by the adsorption force. As the plate becomes closer to a flat plate shape, the surface contact area between the two may be gradually expanded, or the glass plate body having the larger bending rigidity is kept curved by the adsorption force. The surface contact area between the two may be gradually expanded.

  In the above method, the mating surface of the glass plate having the larger bending stiffness is curved into a convex curved surface projecting from the center of the four sides, and the glass having the smaller bending stiffness is formed on the center of the mating surface. The two mating surfaces may be brought into surface contact from the contact portion of the plate body with the mating surface.

  According to such a method, since the part where both glass plates are overlapped spreads concentrically starting from the central part of the four sides where both glass plates first contacted, The air intervening between the two glass plates can be eliminated. As a result, it is possible to avoid the occurrence of defects such as wrinkles on the completed glass laminate due to the air.

  In the above method, the mating surface of the glass plate having the larger bending rigidity is curved into a convex curved surface protruding from a linear central portion parallel to one side, and the linear central portion of the mating surface is The both mating surfaces may be brought into surface contact with each other starting from a contact portion with the mating surface of the glass plate having the smaller bending rigidity.

  According to such a method, the portion where the two glass plates are overlapped starting from the straight central portion where both glass plates first contact each other is parallel to the straight central portion and the straight line. Since it spreads in the direction away from the center of the shape, air intervening between the two glass plates can be eliminated as the overlapping progresses. As a result, it is possible to avoid the occurrence of defects such as wrinkles on the completed glass laminate due to the air.

  As described above, according to the present invention, when the glass laminate is manufactured, it is possible to avoid the occurrence of warpage in the glass laminate, and thus it is possible to prevent the deterioration of the quality of the plate glass obtained by peeling from the glass laminate. Become.

It is a figure which shows the manufacturing method of the glass laminated body which concerns on 1st embodiment of this invention, and the manufacturing equipment used for this. It is a figure which shows the manufacturing method of the glass laminated body which concerns on 2nd embodiment of this invention, and the manufacturing equipment used for this. It is a figure which shows the manufacturing method of the glass laminated body which concerns on 3rd embodiment of this invention, and the manufacturing equipment used for this. It is a vertical side view which shows the glass laminated body manufactured by the conventional method.

  Hereinafter, the manufacturing method of the glass laminated body which concerns on embodiment of this invention is demonstrated with reference to attached drawing. In each of the following embodiments, a glass film and a supporting glass are used as two glass plates, and a case where a glass laminate is produced by superimposing them is described as an example. Moreover, the manufacturing method of the glass laminated body which concerns on this invention is not limited to such an aspect.

  Fig.1 (a) is a figure which shows the manufacturing equipment used for the manufacturing method of the glass laminated body which concerns on 1st embodiment of this invention. As shown in the figure, this equipment includes a surface plate 1 as a work table on which the glass film GF is placed, and four support members 2 arranged on the surface plate 1 and supporting the support glass GS from below. It has. The surface plate 1 has a placement surface 1a on which the glass film GF is placed, and the placement surface 1a is formed in a plane parallel to the horizontal plane. Each of the support members 2 is arranged on the outer surface side of the glass film GF on the surface plate 1, and supports the corner portions of the four corners of the support glass GS from below. As the material of both glasses GF and GS, various materials such as soda lime glass and alkali-free glass can be used, but alkali-free glass should be used from the viewpoint of strength and durability. Is preferred.

  Both glasses GF and GS are flexible and formed in a rectangular shape. Moreover, both glass GF and GS are comprised with the same material, and have substantially equal Young's modulus (longitudinal elastic modulus). Here, since the supporting glass GS has a larger second moment of section with respect to the glass film GF, the bending rigidity calculated by the product of the Young's modulus and the second moment of section is also larger than that of the supporting glass GS. Is getting bigger. In addition, the value of the cross-sectional secondary moment of both glass GF and GS is determined by the cross-sectional shape of both glass GF and GS, and the dimension of this cross section.

  Furthermore, in each of the glasses GF and GS, when they are superposed, the mating surface that is the surface that contacts each other has a surface roughness Ra (arithmetic mean roughness) of 2.0 nm or less. ing. The control of the surface roughness Ra is performed, for example, by adjusting the concentration of the etching solution, the solution temperature, and the processing time when performing the polishing process on both the glasses GF and GS or performing chemical etching. . In addition, the value of the surface roughness Ra of the mating surface is more preferably 1.0 nm or less, further preferably 0.5 nm or less, and most preferably 0.2 nm or less. Further, the thicknesses of both the glasses GF and GS are set such that the glass film GF is 200 μm or less, the support glass GS is 300 μm or more and 1.1 mm or less, and the support glass GS is thicker than the glass film GF. ing.

  Hereinafter, the manufacturing method of the glass laminated body using said equipment is demonstrated.

  As shown in FIG. 1 (a), the support glass GS supported from below by the support member 2 has flexibility, so that the four sides of the support glass GS are shown in FIG. Due to the action of the pressing force from above on the central portion of the lens, or due to its own weight, the mating surface is convexly curved downward and presents a spherical surface (substantially spherical surface). And in this state, the center part of the four sides in the mating surface of the support glass GS is brought into contact with the mating surface in the glass film GF.

  After that, if the support member 2 is removed and the support of the support glass GS is released, the portion (surface) where the two glasses GF and GS are superposed on the concentric circle starting from the central part of the four sides of the support glass GS that first contacted. As the contact area) increases and the surface roughness Ra of the mating surfaces in both glasses GF and GS is 2.0 nm or less, they are in close contact with each other. In this way, the glass laminate G is completed as shown in FIG.

  At this time, the air intervening between both glasses GF and GS can be eliminated as the superposition proceeds. As a result, it is possible to avoid the occurrence of defects such as wrinkles on the finished glass laminate G due to the air.

  When the central portions of the four sides of the mating surface of the support glass GS are brought into contact with the glass film GF, the glass film GF is lifted from the mounting surface 1a of the surface plate 1 and is superposed on the support glass GS. The laminated body G may be completed. In this case, it is not necessary to remove the support member 2 and release the support of the support glass GS.

  According to such a manufacturing method, the difference in bending rigidity between the glasses GF and GS is apparently eliminated, and a glass laminate G that is substantially flat and has no warpage can be manufactured.

  The reason why the above-described effect can be obtained is considered to be as follows. That is, an adhesion force acts between both glasses GF and GS, and this adhesion force is assumed to be caused by hydrogen bonding. Moreover, it is assumed that the force with which the glass film GF attracts the support glass GS and the force with which the support glass GS attracts the glass film GF are equal due to this adhesion force.

  For this reason, when both the glasses GF and GS are overlapped in a flat state, whether or not the glass laminate G warps is determined by the ease of bending deformation between the glasses GF, GS, that is, It is thought that it is governed by whether there is a difference in flexural rigidity.

  And when the bending rigidity of the support glass GS is higher than that of the glass film GF, the glass glass GF having the lower bending rigidity among the both glasses GF and GS stacked under a flat state. It has been found that the surface is curved into a convex curved surface, and the mating surface of the support glass GS having a high bending rigidity is curved into a concave curved surface.

  From these facts, if the supporting glass GS having a large bending rigidity is elastically deformed in a curved shape in advance and curved so that the mating surface in the supporting glass GS is a convex curved surface, the two glasses GF and GS are overlapped. This is probably because the difference in bending rigidity between the glasses GF and GS is apparently eliminated.

  Hereinafter, the manufacturing method of the glass laminated body which concerns on other embodiment of this invention is demonstrated. In addition, in each figure for demonstrating the following 2nd, 3rd embodiment, the shape or function same as the component of the manufacturing equipment used for the manufacturing method of the glass laminated body which concerns on said 1st embodiment is shown. About the component which has, the overlapping description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  Fig.2 (a) is a figure which shows the manufacturing equipment used for the manufacturing method of the glass laminated body which concerns on 2nd embodiment of this invention. The difference between this equipment and the production equipment used in the method for producing a glass laminate according to the first embodiment is that, instead of the support member 2, the suction pad 3 for sucking the support glass GS, and the suction It is a point provided with the string 4 as a flexible suspension member which suspends the pad 3. FIG.

  The suction pad 3 is connected to a suction device (for example, a vacuum pump) (not shown) via a suction pipe (not shown), and a suction hole (for example, a number of suction holes) is formed in a contact portion with the support glass GS. (Suction hole) is formed. The supporting glass GS is suspended and supported by adsorbing each of the four corners of the supporting glass GS with the negative pressure generated by the suction device. The string 4 is stretched by being divided into four forks from vertically above the central portion of the support glass GS, each of which is connected to the suction pad 3.

  Hereinafter, the effect | action of the manufacturing method of the glass laminated body using said installation is demonstrated.

  As shown in FIG. 2A, the support glass GS suspended and supported by being sucked by the suction pad 3 is flexible, and therefore, as shown by a white arrow in the figure. By the action of the pressing force from above on the central part of the four sides of the support glass GS, or due to its own weight, the mating surface is convexly curved downward and presents a spherical surface (substantially spherical surface). And in this state, the center part of the four sides in the mating surface of the support glass GS is brought into contact with the mating surface in the glass film GF.

  Thereafter, if the suction of the support glass GS by the suction pad 3 is canceled, the part (surface contact area) where the two glasses GF and GS are superposed on the concentric circles starting from the central part of the four sides of the support glass GS that first contacts. ) Spreads and the surface roughness Ra of the mating surfaces in both glasses GF and GS is 2.0 nm or less, so that they are in close contact with each other. In this way, the glass laminate G is completed as shown in FIG.

  Also by such a manufacturing method, the difference in bending rigidity between the two glasses GF and GS is apparently eliminated, and a glass laminate G that is substantially flat and has no warpage can be manufactured. Furthermore, the air intervening between the two glasses GF and GS can be eliminated with the progress of superposition. As a result, it is possible to avoid the occurrence of defects such as wrinkles on the finished glass laminate G due to the air.

  Fig.3 (a) is a figure which shows the manufacturing equipment used for the manufacturing method of the glass laminated body which concerns on 3rd embodiment of this invention. The difference between this facility and the manufacturing facility used in the method for manufacturing a glass laminate according to the first embodiment is that the support member 2 is removed and the glass film GF is placed on the surface plate 1. Instead, the support glass GS is mounted, and the mounting surface 1a of the surface plate 1 is curved upward and has a large number of suction holes 5 for adsorbing the support glass GS. is there. The mounting surface 1a of the surface plate 1 has an upwardly convex spherical surface. Further, the suction hole 5 provided in the mounting surface 1a is connected to a suction device (not shown) and is formed over the entire surface of the mounting surface 1a.

  Hereinafter, the effect | action of the manufacturing method of the glass laminated body using said installation is demonstrated.

  As shown in FIG. 3A, since the support glass GS placed on the placement surface 1a has flexibility, the suction glass 5 follows the shape of the placement surface 1a due to the suction of the suction holes 5. Deformed and presents a spherical surface (substantially spherical surface) with the mating surface curved convexly upward. Under this state, as shown by the white arrow in the same figure, the center part of the four sides in the mating surface of the glass film GF and the mating surface in the support glass GS are brought into contact.

  Thereafter, if the adsorption of the supporting glass GS by the numerous suction holes 5 is canceled, the portion where the two glasses GF and GS are superimposed on the concentric circles starts from the central part of the four sides of the supporting glass GS that first contacts. At the same time, the surface roughness Ra of the mating surfaces of both the glasses GF and GS is set to 2.0 nm or less, so that they are in close contact with each other. In this way, the glass laminate G is completed as shown in FIG.

  Also by such a manufacturing method, it becomes possible to acquire the same effect as the manufacturing method of the glass laminated body which concerns on the above-mentioned 1st and 2nd embodiment.

  Here, the manufacturing method of the glass laminated body which concerns on this invention is not limited to the aspect demonstrated by said each embodiment. In each of the above embodiments, the mating surface of the support glass is curved into a spherical surface (substantially spherical), but the mating surface may be curved into another convex curved surface shape. Examples of the shape of such a convex curved surface include an elliptical surface (substantially elliptical surface) and a cylindrical surface (substantially cylindrical surface). An example of the structure of the manufacturing equipment which implement | achieves such an aspect is given.

  For example, when the mating surface in the support glass is curved to a cylindrical surface (substantially cylindrical surface), in the manufacturing facility according to the first embodiment, the support member is changed to a longitudinal one, and the longitudinal support member is It is conceivable that two edges of the supporting glass that are parallel to each other are supported from below by using two. Using such an equipment, a cylindrical surface (substantially a convex surface facing the mating surface of the support glass by applying a pressing force to the linear central portion parallel to the two sides of the support glass from above or by its own weight. (Cylindrical surface). And if this mating surface and the mating surface in the glass film mounted on the surface plate are made to contact, a glass laminated body will be completed.

  In addition, when a glass laminated body is manufactured according to such an embodiment, the linear central portion parallel to the two sides on the mating surface of the supporting glass first comes into contact with the glass film, and the linear central portion The part (surface contact area) where the glass film and the supporting glass are overlapped spreads in a direction parallel to the linear central part and away from the linear central part.

  Further, when the mating surface in the support glass is curved into an elliptical surface (substantially elliptical surface), in the manufacturing facility according to the first embodiment, the distance between the support members in the direction parallel to one side of the support glass, One in which the distance between the support members in the direction orthogonal to the one side is different can be considered. Using such equipment, pressing the center part of the four sides of the supporting glass from above, or curving the mating surface of the supporting glass into an elliptical surface that is convex downward (substantially elliptical surface) by its own weight. it can. And if this mating surface and the mating surface of the glass film mounted on the surface plate are made to contact, a glass laminated body will be completed.

  In addition, in each of the above embodiments, a glass laminate is manufactured by superimposing a glass film and a supporting glass made of the same material, but both glasses made of different materials (for example, It is good also as an aspect which piles up alkali-free glass and soda-lime glass, etc.), and manufactures a glass laminated body. Furthermore, in each said embodiment, it becomes an aspect which manufactures a glass laminated body by making the center part or linear center part in the mating surface of support glass or a glass film contact the mating surface of the other glass. However, the portion to be contacted is not necessarily the central portion or the linear central portion.

  Further, in each of the above embodiments, the support glass, the suction pad, or the surface plate provided with the mounting surface having the suction holes is used to bend the mating surface of the support glass into a spherical surface (substantially spherical surface). However, it is good also as an aspect which curves the mating surface in support glass using the robot arm by which the front-end | tip of the arm was divided into two forks. In this case, as a mode in which two parallel sides of the supporting glass are supported from below at each of the two parts divided into two forks, the mating surface is curved into a cylindrical surface (substantially cylindrical surface) convex downward. And if this mating surface and the mating surface in the glass film mounted on the surface plate are made to contact, a glass laminated body will be completed.

  Furthermore, in each of the above embodiments, as two glass plates, a glass laminate is manufactured by superimposing a glass film and a supporting glass, but as two glass plates, a plate glass and It is good also as an aspect which uses a glass laminated body or two glass laminated bodies, and superimposes these and manufactures a glass laminated body.

  In order to verify the effect of the present invention, a glass laminate is manufactured by superposing a glass film and a supporting glass under the following seven manufacturing conditions (Examples 1 to 4 and Comparative Examples 1 to 3). The quality of the warp was determined by measuring the size of warpage in the laminated glass. The manufacturing conditions of a glass laminated body are shown below.

  Non-alkali glass (product name: OA-10G) manufactured by Nippon Electric Glass Co., Ltd. was used as the glass film and supporting glass. After these are molded by the overflow down draw method, the presence or absence of polishing processing on the molded glass, or the chemical etching, the concentration of the etchant, the temperature of the solution, the adjustment of the processing time, in the glass film and support glass The surface roughness Ra of the mating surfaces was controlled.

For the measurement of the surface roughness Ra, a scanning probe microscope (NanoNaviII /
S-image) was measured by applying the method for measuring the surface roughness of a fine ceramic thin film using a JIS R1683: 2007 atomic force microscope. However, the measurement points were measured at two points of one corner portion and one central portion in each of the glass film and the supporting glass, and the average value was defined as the surface roughness Ra of the glass film and the supporting glass. .

  Both the glass film and the supporting glass were washed and dried, and then the glass film was superposed on the supporting glass to produce a glass laminate. Here, in Examples 1, 3, and 4, in contact with the glass film in a state in which the mating surface of the supporting glass is curved so as to be a spherical surface (substantially spherical surface) in the same manner as in the third embodiment. And superimposed. In the embodiment of Example 2, the shape of the mounting surface on the surface plate that adsorbs the supporting glass is changed from the spherical surface to the cylindrical surface in the embodiments of Examples 1, 3, and 4. Furthermore, in Comparative Examples 1-3, both the glass film and the supporting glass were brought into contact in a flat state and overlapped.

  After that, the glass laminate completed under each manufacturing condition is placed on a surface plate, and using a thickness gauge, the corners of the four corners of the glass laminate and the four sides forming the outline of the glass laminate are arranged. The amount of warpage at a total of eight points was measured as the amount of deformation (distance from the mounting surface of the surface plate on which the glass laminate was placed to the lower surface of the supporting glass). And the quality was determined based on whether or not the maximum deformation amount among the eight points was suppressed to an allowable deformation of 600 μm or less in the plate glass used as the liquid crystal panel.

The following table | surface shows the dimension of the glass film used for the Example and the comparative example, and support glass, surface roughness, and the largest deformation amount measured. In addition, the dimension of a glass film and support glass is the same except the thickness of a board.

  From the above table, regardless of the difference in the size and thickness of the glass film and the supporting glass, in the example, in the plate glass used as the liquid crystal panel, the warpage is suppressed to a deformation smaller than the allowable 600 μm. I was able to. On the other hand, in any of the comparative examples, it was impossible to suppress the warpage to 600 μm or less.

  From the above, according to the present invention, the glass plate having the larger bending rigidity is elastically deformed in a curved shape in advance, and is curved so that the mating surface of the glass plate is a convex curved surface. If the two glass plates are superposed, the difference in bending rigidity between the two glass plates is apparently eliminated, and it is presumed that a glass laminate that is substantially flat and free of warpage can be produced.

DESCRIPTION OF SYMBOLS 1 Surface plate 1a Mounting surface 2 Support member 3 Suction pad 4 String 5 Suction hole G Glass laminated body GF Glass film GS Support glass

Claims (7)

In each of the two glass plates having a flat plate shape, the surface roughness Ra of the mating surface to be a surface in contact with each other is set to 2.0 nm or less, and the two mating surfaces are brought into surface contact with each other. It is a manufacturing method of a glass laminate for producing a glass laminate in which glass plates are stacked,
When the two mating surfaces are brought into surface contact, the mating surface of the glass plate body is formed into a convex curved surface by elastically deforming the glass plate body having the larger bending rigidity out of the two glass plate bodies. A method for producing a glass laminate, which is curved.   Of the two glass plates, the thickness of the glass plate having the smaller bending rigidity is 200 μm or less, and the thickness of the glass plate having the larger bending stiffness is 300 μm or more and 1.1 mm or less. The manufacturing method of the glass laminated body of Claim 1 characterized by the above-mentioned.   The method for producing a glass laminate according to claim 1 or 2, wherein the two glass plates are made of the same material. Of the two glass plates, the glass plate having the smaller bending stiffness is placed on a plane, and the glass plate having the larger bending stiffness is placed from the glass plate having the smaller bending stiffness. After supporting the elastically deformable at a position spaced upward,
The glass laminate according to any one of claims 1 to 3, wherein both the mating surfaces are brought into surface contact by curving the mating surfaces of the glass plate having the larger bending rigidity downward into a convex curved surface. Body manufacturing method. Of the two glass plates, the glass plate having the larger bending rigidity is placed on a convex curved surface having a suction hole for adsorbing the glass plate, and the glass plate is adsorbed. , After curving the mating surface upward to form a convex curved surface,
The glass laminated body according to any one of claims 1 to 3, wherein a mating surface in a glass plate having a smaller bending rigidity is brought into surface contact with a mating surface in a glass plate having a larger bending rigidity. Manufacturing method.   The mating surface of the glass plate having the larger bending stiffness is curved into a convex curved surface projecting from the center of the four sides, and the mating surface of the glass plate having the smaller bending stiffness and the central portion of the mating surface. The method for producing a glass laminate according to any one of claims 1 to 5, wherein the two mating surfaces are brought into surface contact with each other as a starting point.   The mating surface of the glass plate having the larger bending rigidity is curved into a convex curved surface projecting from a linear central portion parallel to one side, and the bending stiffness is small with respect to the linear central portion of the mating surface. The method for producing a glass laminate according to any one of claims 1 to 5, wherein the two mating surfaces are brought into surface contact starting from a contact portion with the mating surface of the other glass plate.

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