JP2014128908A - 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 in a glass laminate is avoided when producing a glass laminate.SOLUTION: A production method of a glass laminate is that in respective a glass laminate GA and a support glass G1, surface roughnesses Ra of mating surfaces G1a, G3b that become surfaces of sides that mutually contact are made at least 2.0 nm, both mating surfaces G1a, G3b are surface-contacted, thereby the glass laminate GA and the support glass G1 are superimposed to produce a glass laminate GB, and flexural rigidities of the glass laminate GA and the support glass G1 are made equal mutually.

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 glass laminate manufacturing method for manufacturing a glass laminate in which the two glass plates are superposed by bringing the two mating surfaces into surface contact, wherein the bending stiffnesses of the two glass plates are equal to each other. Characterized by Here, the “glass plate” includes not only the plate glass but also a glass laminate in which two or more plate glasses are stacked, for example, a plate glass. In addition, “the bending stiffness is equal to each other” means that not only when the bending stiffness values are completely the same, but also when there is a difference between the two values, the difference in the values is the larger bending stiffness. The case where it is 15% or less of the value is also included. However, this difference is more preferably 10% or less, and most preferably 5% or less.

  According to such a configuration, when two glass plates are overlapped, an adhesion force is generated between both mating surfaces by surface contact of each mating surface 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 such a viewpoint, when both of the two glass plates are overlapped in a flat state, whether or not the warp occurs in the glass laminate, 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. In consideration of the above matters, when two glass plates having the same bending rigidity were overlapped, a glass laminate that was substantially flat and free from warping could be produced. In consideration of the above matters, according to such a method, when a glass laminate is produced by superposing glass plates, it is possible to avoid the occurrence of warpage in the glass laminate, and thus the plate glass obtained by peeling from the glass laminate. It is possible to prevent the deterioration of quality.

  In the above method, at least one of the two glass plates may be a glass laminate in which a plurality of plate glasses having equal bending rigidity are stacked.

  Due to the above-described effects, when two sheet glasses are overlapped, they have the same bending rigidity, so that a glass laminate that is substantially flat and free of warpage can be produced. In addition, when two glass laminates composed of these two plate glasses are manufactured and overlapped, they have the same bending rigidity, so that the two glass laminates are both substantially flat and have no warpage. It becomes possible to manufacture a body (a glass laminate composed of four plate glasses). Similarly, as long as glass laminates composed of the same number of plate glasses are overlapped to produce a new glass laminate, a glass laminate free from warpage can always be produced. And the glass laminated body manufactured by superposing | stacking the glass laminated body as one glass plate body manufactured in this way and the other glass plate body which has the bending rigidity mutually equal to this glass laminated body. In this case, it is possible to avoid warping.

  In the above method, an arbitrary number of plate glasses may be peeled from the glass laminate that is the at least one glass plate.

  When removing an arbitrary number of plate glasses by removing them from a glass laminate in which a plurality of plate glasses are stacked, the bending rigidity of the removed plate glass (the bending rigidity of the entire number of plate glasses) It has been found that even if there is a difference in the bending rigidity of the glass laminate from which the plate glass has been removed, there is no warping between the two. For this reason, when an arbitrary number of plate glasses were removed from a glass laminate composed of a glass laminate in which a plurality of plate glasses as one glass plate were stacked and the other glass plate, it was removed. Even if there is a difference between the bending rigidity of the sheet glass and the bending rigidity of the glass laminate from which the sheet glass has been removed, there will be no warping of both. As a result, it is possible to manufacture a glass laminate including only a desired number of plate glasses among the above-described plurality of plate glasses while avoiding the occurrence of warpage.

  As described above, according to the present invention, when producing a glass laminate, it is possible to prevent the deterioration of the quality of the plate glass obtained by peeling the glass laminate by avoiding the occurrence of warpage in the glass laminate. It becomes possible.

It is a perspective view which shows the manufacturing method of the glass laminated body which concerns on 1st embodiment of this invention. It is a perspective view which shows the manufacturing method of the glass laminated body which concerns on 1st embodiment of this invention. It is a perspective view which shows the manufacturing method of the glass laminated body which concerns on 2nd embodiment of this invention. It is a 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 the following description, “the bending stiffness is equal to each other (same)” means not only when the bending stiffness values are completely the same, but also when there is a difference between the two values. Includes the case of 15% or less of the value of the larger bending stiffness. However, this difference is more preferably 10% or less, and most preferably 5% or less.

  Drawing 1 (a)-(c) is a perspective view showing the manufacturing method of the glass layered product concerning a first embodiment of the present invention. Fig.1 (a) has illustrated the component which comprises the glass laminated body GB manufactured by this embodiment. As shown in the figure, the glass laminate GB includes a single supporting glass G1 having a large thickness and two plate glasses G2 and G3 each having a small thickness.

  The supporting glass G1 has flexibility (can be elastically deformed), and its upper and lower surfaces are formed in a rectangular shape. The same vertical length and horizontal length as the two glass plates G2 and G3, and Has material. In addition, it is more preferable that the length in the vertical direction and the length in the horizontal direction of the support glass G1 are slightly larger than those of the both glass plates G2 and G3. Further, the support glass G1 is thicker than each of the both plate glasses G2 and G3, and the value of the bending rigidity of the support glass G1 is larger than that of each of the both plate glasses G2 and G3. As will be described later, this is the same as the glass laminate GA manufactured by superimposing both glass plates G2 and G3. Further, of the upper and lower surfaces G1a and G1b of the support glass G1, the lower surface G1b as a mating surface has a surface roughness Ra (arithmetic average roughness) of 2.0 nm or less. The value of the surface roughness Ra is more preferably 1.0 nm or less, still more preferably 0.5 nm or less, and most preferably 0.2 nm or less.

  Both the plate glasses G2 and G3 have flexibility and are formed in a rectangular shape like the support glass G1. Further, the both glass plates G2 and G3 have the same longitudinal length, lateral length, plate thickness, and material. Furthermore, each of the glass plates G2 and G3 has the same bending rigidity value and is smaller than the supporting glass G1. In addition, of the upper and lower surfaces G2a and G2b of the plate glass G2, the lower surface G2b as the mating surface and the upper and lower surfaces G3a and G3b as the mating surfaces of the plate glass G3 have a surface roughness Ra of 2.0 nm or less. . The value of the surface roughness Ra is more preferably 1.0 nm or less, still more preferably 0.5 nm or less, and most preferably 0.2 nm or less.

  In addition, since the support glass G1 and the both glass plates G2 and G3 are made of the same material, they have substantially the same Young's modulus (longitudinal elastic modulus). The bending rigidity of each glass G1, G2, G3 is determined by the product of this Young's modulus and the cross-sectional shape of each glass G1, G2, G3, and the secondary moment of inertia determined from the dimensions of this cross-section. Furthermore, the control of the surface roughness Ra is performed by adjusting the concentration of the etching solution, the solution temperature, the processing time, etc., when the glass G1, G2, G3 is polished or when chemical etching is performed. The

  As a process for manufacturing the glass laminate GB, among the glasses G1, G2, and G3, first, the lower surface G2b of the plate glass G2 and the upper surface G3a of the plate glass G3 are brought into surface contact with each other in FIG. As shown, a glass laminate GA in which both glass plates G2 and G3 are overlapped is manufactured. At this time, since both the plate glasses G2 and G3 have the same bending rigidity, it is possible to make the glass laminate GA substantially flat and without warping. In this case, both glass plates G2 and G3 correspond to two glass plates.

  Thus, it is assumed that the glass laminated body GA without a curvature can be manufactured for the following reasons. That is, when the two glass plates G2 and G3 are overlapped, an adhesion force acts between them. This adhesion force is assumed to be due to hydrogen bonding, and the force that the plate glass G2 attracts the plate glass G3 and the force that the plate glass G3 attracts the plate glass G2 are assumed to be equal.

  For this reason, when the glass laminate GA is manufactured by superimposing both glass plates G2, G3, whether or not the glass laminate GA is warped is determined by the ease of bending deformation between the glass plates G2, G3, That is, it is considered that it is governed by whether or not there is a difference in bending rigidity, and it is assumed that the bending rigidity of the two glass sheets G2 and G3 is equal to each other, thereby preventing warpage.

  When the production of the glass laminate GA is completed, as a next step, the lower surface G3b (the lower surface G3b of the plate glass G3) of the glass laminate GA and the upper surface G1a of the support glass G1 are brought into surface contact with each other, as shown in FIG. As shown in FIG. 4, a glass laminate GB is produced by laminating a glass laminate GA and a supporting glass G1. Also in this case, since the glass laminate GA and the support glass G1 have the same bending rigidity, the glass laminate GB can be made substantially flat and without warping. Here, in this case, the glass laminate GA constituted by two plate glasses G2 and G3 and the support glass G1 correspond to two glass plates.

  Further, as shown in FIGS. 2A to 2C, a glass laminate (glass laminate GA in FIG. 1), which is a component of the glass laminate GB, and is composed of two sheet glasses G2 and G3. From FIG. 2 (b), when the sheet glass G2 is peeled and removed as an arbitrary number, the bending rigidity of the removed sheet glass G2 and the sheet glass G2 are removed, unlike the case of overlapping. It has been found that even if there is a difference in the bending rigidity of the glass laminate GC (glass laminate composed of the supporting glass G1 and the plate glass G3), no warpage occurs between them.

  For this reason, as shown in FIG.2 (c), manufacturing the glass laminated body GC containing only one sheet glass G3 desired among two sheet glass G2, G3, avoiding generation | occurrence | production of curvature. Can do. Here, when the plate glass G3 which is a constituent element of the glass laminate GC is subjected to various manufacturing-related treatments and then peeled off from the support glass G1, the warp does not occur even in the removed plate glass G3. It is confirmed that the product can be used without any problem.

  In this embodiment, after manufacturing the glass laminate GB, the plate glass G2 is peeled from the glass laminate GB and the plate glass G3 is peeled from the glass laminate GC. Even when the glass sheet G2 or the glass sheet G3 is peeled from the laminated body GA or when the support glass G1 is peeled from the glass laminated body GB, it is possible to avoid the occurrence of warpage in both separated parts. From the above, according to such a manufacturing method, when each of the glass laminates GA, GB, GC described above is manufactured, occurrence of warpage is avoided in any of the glass laminates GA, GB, GC. Therefore, it is possible to prevent deterioration of the quality of each glass G1, G2, G3 obtained from this.

  FIGS. 3A and 3B are perspective views showing a method for manufacturing a glass laminate according to the second embodiment of the present invention. In addition, the glass laminated body GA manufactured with the manufacturing method of the glass laminated body which concerns on said 1st embodiment among the components of the glass laminated body GE manufactured with the manufacturing method of the glass laminated body which concerns on this 2nd embodiment. , GB, and GC are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 3A shows the constituent elements that constitute the glass laminate GE manufactured in the present embodiment. The difference between the constituent elements of the glass laminate GE and the constituent elements of the glass laminates GA, GB, and GC manufactured by the method for manufacturing a glass laminate according to the first embodiment described above is the support glass G1. Instead, two plate glasses G4 and G5 are constituent elements.

  As a process for manufacturing the glass laminate GE, as shown in the figure, first, a glass laminate GA in which both plate glasses G2 and G3 are overlaid, and a glass laminate GD in which both plate glasses G4 and G5 are overlaid, Is manufactured. At this time, since both glass plates G4 and G5 have the same bending rigidity, the glass laminate GD can be made substantially flat and free of warpage. In this case, both glass plates G4 and G5 correspond to two glass plates.

  When the production of both the glass laminates GA and GD is completed, as the next step, the lower surface G3b of the glass laminate GA and the upper surface G4a of the glass laminate GD are brought into surface contact with each other. The glass laminated body GE which laminated | stacked these is manufactured. Also in this case, since the glass laminate GA and the glass laminate GD have the same bending rigidity, the glass laminate GE can be made substantially flat and free of warpage. Here, in this case, the two-plate glass laminates GA and GD correspond to two glass plates.

  Further, when an arbitrary number of sheets, for example, the sheet glass G2 is peeled and removed from the glass laminate GE, the bending rigidity of the removed sheet glass G2 and the glass laminate (sheet glass G3, G4, from which the sheet glass G2 is removed). Even if there is a difference in the bending rigidity of the glass laminate composed of G5), no warpage occurs between the two. Therefore, it is possible to manufacture a glass laminate including only the desired three plate glasses G3, G4, and G5 among the four plate glasses G2, G3, G4, and G5 while avoiding the occurrence of warpage.

  In addition, in this embodiment, after manufacturing the glass laminated body GE, although the case where the plate glass G2 was peeled from the said glass laminated body GE was demonstrated, in addition to this, two sheets from a glass laminated body GE, or three sheets Even in the case where the plate glass is peeled off, it is possible to avoid the occurrence of warpage in both separated parts. From the above, according to such a manufacturing method, when each of the glass laminates GA, GD, and GE described above is manufactured, occurrence of warpage is avoided in any of the glass laminates GA, GD, and GE. Therefore, it is possible to prevent the quality of each of the glass sheets G2, G3, G4, and G5 obtained from being peeled from being deteriorated.

  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. For example, in each of the above embodiments, the glass laminates are manufactured by stacking plate glasses having the same material, but the glass laminates may be manufactured by stacking plate glasses of different materials. Moreover, unlike said each embodiment, the dimension (vertical direction length, horizontal direction length, plate | board thickness) of the plate glass laminated | stacked may differ. Also in these cases, if the bending rigidity of the two glass plates to be superimposed is equal to each other, the same operational effects as those of the method for manufacturing a glass laminate according to each of the above embodiments can be obtained.

  In order to verify the effect of the present invention, a glass laminate was produced by superimposing two glass plates under the following six conditions (Examples 1 to 4, Comparative Examples 1 and 2), and a finished glass laminate The quality of the warp was determined by measuring the amount of warpage in the body. The manufacturing conditions of a glass laminated body are shown below. In addition, as a glass plate body, the glass laminate which laminated | stacked the glass film which is thin plate glass, support glass, glass films, the glass film (one sheet or several sheets), and support glass. Using the body.

  A glass film and a supporting glass were used as components of the glass laminate, and non-alkali glass (product name: OA-10G) manufactured by Nippon Electric Glass Co., Ltd. was used for both glasses. 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. .

  After washing and drying both the glass film and the supporting glass, a glass laminate was produced under the following production conditions. Note that the surface roughness Ra of the mating surfaces that are the surfaces on which they are in contact with each other is 2.0 nm or less. Moreover, the vertical direction dimension and the horizontal direction dimension of a glass film and support glass are the same, and are 300 mm x 300 mm. Furthermore, since both the glass film and the supporting glass are made of alkali-free glass and have approximately the same Young's modulus (longitudinal elastic modulus), the magnitude of the bending rigidity is the size of the thickness of each glass. When the plate thickness is the same, the value of the bending stiffness is the same.

Example 1
Two glass films having a plate thickness of 100 μm were superposed to produce a glass laminate having a plate thickness of 200 μm.
(Example 2)
A support glass having a thickness of 200 μm and a glass laminate composed of two glass films having a thickness of 100 μm were superposed to produce a glass laminate having a thickness of 400 μm.
(Example 3)
One glass film having a plate thickness of 100 μm was peeled from the glass laminate having a plate thickness of 400 μm manufactured in Example 2 to produce a glass laminate having a plate thickness of 300 μm.
Example 4
Two glass laminates with a plate thickness of 200 μm produced in Example 1 were superposed to produce a glass laminate with a plate thickness of 400 μm.
(Comparative Example 1)
A support glass having a thickness of 400 μm and a glass film having a thickness of 100 μm were overlapped to produce a glass laminate having a thickness of 500 μm.
(Comparative Example 2)
The support glass having a thickness of 300 μm and the glass laminate having a thickness of 200 μm manufactured in Example 1 were overlapped to produce a glass laminate having a thickness of 500 μm.

  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 glass laminate). And the quality was determined on the basis of whether the maximum deformation amount (μm) 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.

Below, the measured value of the maximum amount of deformation (the amount of warpage) is shown for the glass laminate produced under each condition.
Example 1: 100 μm
Example 2: 180 μm
Example 3: 180 μm
Example 4: 170 μm
Comparative Example 1: 650 μm
Comparative Example 2: 700 μm

  From the above measurement results, in Examples 1 to 4, it was possible to suppress warpage in the deformation smaller than the allowable 600 μm in the plate glass used as the liquid crystal panel. On the other hand, in each of Comparative Examples 1 and 2, it was impossible to suppress the warpage to 600 μm or less. This is because, in Examples 1 to 4, when the glass laminate was manufactured, the bending rigidity of the two glass plates was made equal to each other, thereby preventing the occurrence of warpage in the glass laminate. It is inferred.

G1 support glass G2 plate glass G3 plate glass G4 plate glass G5 plate glass GA glass laminate GB glass laminate GC glass laminate GD glass laminate GE glass laminate

Claims (3)

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,
The method for producing a glass laminate, wherein the bending stiffnesses of the two glass plates are equal to each other.   2. The glass laminate according to claim 1, wherein at least one of the two glass plates is a glass laminate in which a plurality of plate glasses having equal bending rigidity are stacked. Production method.   The method for producing a glass laminate according to claim 2, wherein an arbitrary number of plate glasses are peeled from the glass laminate that is the at least one glass plate.

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