JP2022154343A - Glass laminated body, and glass packaging body - Google Patents

Abstract

To provide a technology that restricts damage caused by warped glass plate when using a filamentous spacer.SOLUTION: The glass laminated body includes: laminated multiple glass plates; and a filamentous spacer provided between the glass plates adjacent to one another or between the glass plate and a pallet. The glass plate is rectangular in a plan view and has a first side and a second side that are parallel to each other and a third side and a fourth side that are parallel to each other. The filamentous spacer extends in the first direction that is parallel to the first side and the second side at least from the third side to the fourth side and also is provided in the second direction that is parallel to the third side and the fourth side at an interval. The Nth (N is an integer of 1 or over) glass plate from the top and the filamentous spacer that abuts the underside of the Nth glass plate satisfies the formula (1) on the specification.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to glass laminates and glass packages.

From the viewpoint of transportation efficiency, the glass sheets are stacked and transported. If adjacent glass plates come into contact with each other, scratches will occur. Therefore, an interleaving paper is placed between the adjacent glass plates (see Patent Document 1, for example).

In recent years, the demand for interleaving paper is increasing, and the price of interleaving paper is rising. In addition, when interleaving paper is used, foreign substances contained in the interleaving paper other than cellulose, such as adhesive components such as nylon, polyester, EVA, and acrylic resins, may adhere to the glass plate, and the glass plate must be washed. can be difficult to use, because the glass plate cannot be removed.

Patent Literature 2 discloses the use of filamentous spacers instead of interleaving paper as spacers interposed between glass plates. Unlike the interleaving paper, the filamentous spacers contact only a portion of the glass plate's lower or upper surface, rather than the entire surface. Therefore, adhesion of foreign matter to the glass plate can be suppressed. Moreover, unlike interleaving paper, filamentous spacers can be collected and reused after use. Therefore, resources can be saved.

JP 2017-186729 A Japanese Patent Application Laid-Open No. 2007-230610

The thread spacers contact only a portion of the lower surface of the upper glass plate, but not all of it. Therefore, the upper glass plate may bend due to its own weight and come into contact with the lower glass plate or pallet. The problem was more conspicuous as the thickness of the glass plate was thinner. This is because the thinner the glass plate, the easier the glass plate bends.

Conventionally, filamentous spacers are used for relatively thick glass plates, and the deflection of the glass plate is so small that it can be ignored.

One aspect of the present disclosure provides a technique for suppressing the occurrence of scratches due to bending of a glass plate when a thread-like spacer is used.

A glass laminate according to an aspect of the present disclosure includes a plurality of laminated glass plates and thread-like spacers arranged between the adjacent glass plates or between the glass plate and a pallet. Each of the glass plates has a rectangular shape in a plan view, and has a first side and a second side parallel to each other and a third side and a fourth side parallel to each other. The filamentous spacer extends from at least the third side to the fourth side in a first direction parallel to the first side and the second side, and extends along the third side and the fourth side. are spaced apart in a second direction parallel to each other. The N-th (N is an integer of 1 or more) glass plate from the top has a Young's modulus of E (MPa), a density of ρ (kg/mm ³ ), and a plate thickness of t (mm). , the length of each of the first side and the second side is a (mm). The filamentous spacer abutting on the lower surface of the Nth glass plate from the top has a thickness of H (μm), and the distance between the centerlines of the filamentous spacers in the second direction is L (mm). . The following formula (1) holds.

According to one aspect of the present disclosure, the N-th glass plate from the top (N is an integer of 1 or more) and the thread-like spacer in contact with the lower surface of the N-th glass plate from the top satisfy the above formula (1). Fulfill. Therefore, the thickness of the filamentous spacers is greater than the deflection of the upper glass plate. Therefore, contact between the upper glass plate and the lower glass plate or pallet can be suppressed, and the occurrence of scratches can be suppressed.

FIG. 1 is a perspective view showing a glass package according to one embodiment. FIG. 2 is a plan view showing an example of the arrangement of the N-th glass plate from the top and the thread-like spacers in contact with the lower surface of the glass plate. FIG. 3 shows that the weight of the glass plates from the first glass plate 21 from the top to the N-1 (N is an integer equal to or more than 2) glass plates from the top exerts a bending moment on the Nth glass plate from the top. FIG. 4 is a cross-sectional view showing an example of the arrangement of filamentous spacers that does not generate . FIG. 4 shows that the weight of the glass plates from the first glass plate 21 from the top to the N-1 (N is an integer equal to or greater than 2) glass plates from the top exerts a bending moment on the Nth glass plate from the top. is a cross-sectional view showing an example of the arrangement of filamentous spacers that generate . FIG. 5 is a cross-sectional view showing an enlarged view of one end of the glass plate in the Y-axis direction. FIG. 6 is a diagram showing an example of the relationship between the distance between the thread-like spacers, the deflection of the glass plate, and the presence or absence of contact.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In addition, in each drawing, the same reference numerals are given to the same or corresponding configurations, and explanations thereof may be omitted. In each drawing, the X-axis direction, the Y-axis direction and the Z-axis direction are directions perpendicular to each other, the X-axis direction and the Y-axis direction are horizontal directions, and the Z-axis direction is a vertical direction.

First, a glass package 1 according to this embodiment will be described with reference to FIG. A glass package 1 includes a glass laminate 2 and a pallet 3 on which the glass laminate 2 is placed. The glass laminate 2 includes a plurality of laminated glass plates 21 and thread-like spacers 22 arranged between adjacent glass plates 21 or between the glass plate 21 and the pallet 3 .

The multiple glass plates 21 have, for example, the same shape and the same dimensions. The number of glass plates 21 included in the glass laminate 2 is not particularly limited, but is, for example, 50 or more and 800 or less, preferably 120 or more and 600 or less, more preferably 140 or more and 250 or less. be.

The glass plate 21 is for a display, for example, and more specifically, it is a substrate on which a TFT (Thin Film Transistor), a color filter, or the like is formed, or a cover glass. The glass plate 21 may be a semiconductor wafer, such as a silicon wafer, or a carrier substrate bonded with a semiconductor chip.

The carrier substrate is, for example, bonded to the semiconductor wafer before the semiconductor wafer is thinned and reinforces the semiconductor wafer during the thinning of the semiconductor wafer. After thinning the semiconductor wafer, the semiconductor wafer and carrier substrate are separated.

Alternatively, the carrier substrate may be bonded to the plurality of semiconductor chips to position the plurality of semiconductor chips before sealing the plurality of semiconductor chips with resin. After sealing the plurality of semiconductor chips with resin, the plurality of semiconductor chips and the carrier substrate are separated.

The thread-like spacers 22 are arranged between the adjacent glass plates 21 to suppress the occurrence of scratches. Also, the thread-like spacer 22 is arranged between the glass plate 21 and the pallet 3 to suppress the occurrence of scratches.

Unlike the interleaving paper, the thread-like spacers 22 contact only a part of the lower surface or the upper surface of the glass plate 21, not the entire surface. Therefore, adhesion of foreign matter to the glass plate 21 can be suppressed, and the quality of the glass plate 21 can be improved. Since the glass plate 21 for display or carrier substrate is required to have a high degree of cleanliness, the filamentous spacers 22 are suitable.

In addition, unlike interleaving paper, the filamentous spacers 22 can be collected and reused after use. Therefore, resources can be saved. The filamentous spacers 22 may be washed before reuse. Foreign matter adhering to the thread-like spacers 22 can be removed by washing.

The cross-sectional shape of the thread-like spacer 22 may be circular or rectangular. When the cross-sectional shape of the filamentous spacers 22 is rectangular, the glass plate 21 can be supported more stably than when the cross-sectional shape is circular. When the cross-sectional shape of the filamentous spacers 22 is circular, the contact area with the glass plate 21 is smaller than when the cross-sectional shape is rectangular, and adhesion of foreign matter to the glass plate 21 can be further suppressed.

The material of the filamentous spacers 22 is not particularly limited, but may be, for example, natural fibers or synthetic fibers. Specific examples of natural fibers include cotton, linen, silk, and wool. Specific examples of synthetic fibers include rayon, cupra, acetate fiber, polyethylene (PE) fiber, nylon fiber, polyester fiber, polyamide fiber, polyimide fiber, acrylic fiber, polyarylate fiber, polyparaphenylenebenzobisoxazole (PBO). fibers, polybenzimidazole (PBI) fibers, polyphenylene sulfide (PPS) fibers, fluorine fibers and carbon fibers. The thread-like spacer 22 may be a monofilament, a multifilament, or a twisted thread obtained by twisting a plurality of threads. Moreover, the thread|yarn which combined multiple types among the said fiber may be sufficient.

The pallet 3 is a flat pallet that horizontally supports each glass plate 21 . The pallet 3 is a flat pallet in this embodiment, but may be a vertical pallet. The vertical pallet supports each glass plate 21 obliquely.

Next, with reference to FIG. 2, the arrangement of the N-th (N is an integer equal to or greater than 1) glass plate 21 from the top and the thread-like spacers 22 in contact with the lower surface of the glass plate 21 according to the present embodiment will be described. do. As shown in FIG. 2, the glass plate 21 has a rectangular shape in plan view, and has a first side 211 and a second side 212 parallel to each other, and a third side 213 and a fourth side 214 parallel to each other. .

In this specification, “planar view” means viewing from a direction perpendicular to the main surface of the glass plate 21 . For example, when the glass plate 21 is horizontally supported, "planar view" means viewing from the Z-axis direction.

The length a of each of the first side 211 and the second side 212 and the length b of each of the third side 213 and the fourth side 214 may be the same or different. That is, the rectangle may or may not be a square. A rectangle may also include a shape with chamfered corners.

The filamentous spacer 22 extends in a first direction (for example, the X-axis direction) parallel to the first side 211 and the second side 212 from at least the third side 213 to the fourth side 214 and extends from the third side 213 to the fourth side 214 . and are spaced apart in a second direction (eg, Y-axis direction) parallel to the fourth side 214 .

For example, a plurality of thread-like spacers 22 are arranged at intervals in the Y-axis direction. Although not shown, the thread-like spacers 22 may have U-shaped folded portions at one end or both ends in the Y-axis direction, or may be arranged in a zigzag pattern. That is, one thread-like spacer 22 may have a plurality of linear portions spaced apart in the Y-axis direction and folded portions connecting adjacent linear portions in the Y-axis direction.

In the glass plate 21 , each length a of the first side 211 and the second side 212 may be longer than each length b of the third side 213 and the fourth side 214 . In other words, the glass plate 21 may have long sides and short sides in plan view.

When the glass plate 21 has long sides and short sides in plan view, the thread-like spacers 22 may be provided parallel to the long sides. Compared to the case where the thread-like spacers 22 are provided parallel to the short sides, the number of thread-like spacers 22 or the number of folded portions of the thread-like spacers 22 can be reduced.

Next, referring to FIG. 3, the weight of the glass plate 21 N-1 from the first glass plate 21 ₁ from the top to the N-1 (N is an integer of 2 or more) glass plate 21 _N-1 from the top is An example of arrangement of the thread-like spacers 22 that does not generate a bending moment in the _N -th glass plate 21N from the top will be described. In FIG. 3, 22 _N-1 represents a thread-like spacer that abuts on the bottom surface of the N-1th glass plate 21 _N-1 from the top, and 22 _N abuts on the bottom surface of the N-th glass plate 21 _N from the top. Represents a tangential filamentous spacer.

As shown in FIG. 3, even if the upper thread-like spacer 22 _N−1 and the lower thread-like spacer 22 _N are arranged at the same position in the Y-axis direction with the Nth glass plate 21 _N interposed therebetween. good. In this case, the weight of the glass plates 21 ₁ to 21 _N−1 does not generate a bending moment in the glass plate 21 _N. In this case, the glass plate _21N bends only by its own weight. The _first glass plate 211 from the top naturally bends only by its own weight. Therefore, N may be 1.

Deflection caused by the weight of the Nth ( _N is a natural number equal to or greater than 1) glass plate 21N from the top is also referred to as the weight of the glass plate 21N. Self-weight deflection mainly consists of (1) the following parameters related to the _N -th glass plate 21N from the top and (2) the following parameters related to the thread-like spacer _22N in contact with the lower surface of the _N -th glass plate 21N from the top. is determined by the parameters of

(1) The glass plate 21 _N has a Young's modulus of E (MPa), a density of ρ (kg/mm ³ ), a plate thickness of t (mm), and the first side 211 and the second side 212 is a (mm). E is, for example, 60000 MPa or more and 110000 MPa or less, preferably 65000 MPa or more and 95000 MPa or less, more preferably 70000 MPa or more and 90000 MPa or less. ρ is, for example, 2.2×10 ⁻⁶ kg/mm ³ or more and 3.0×10 ⁻⁶ kg/mm ³ or less, preferably 2.3×10 ⁻⁶ kg/mm ³ or more and 2.8×10 ⁻⁶ kg/mm ³ or less, more preferably 2.4×10 ⁻⁶ or more and 2.7×10 ⁻⁶ or less. t is, for example, 0.05 mm or more and 2.0 mm or less, preferably 0.05 mm or more and 0.6 mm or less. a is, for example, 100 mm or more and 4000 mm or less, preferably 300 mm or more and 3300 mm or less, more preferably 1500 mm or more and 3300 mm or less, still more preferably 1800 mm or more and 3300 mm or less.

(2) The filamentous spacers 22N have a thickness of _H (μm), and the distance between the filamentous spacers 22N in the Y _- axis direction is L (mm). H is, for example, 50 μm or more and 1000 μm or less, preferably 100 μm or more and 800 μm or less, more preferably 200 μm or more and 500 μm or less. H is measured with the weight of the glass plates 21 ₁ to _21N applied to the thread _- like spacer 22N. L is, for example, 2 mm or more and 500 mm or less, preferably 20 mm or more and 300 mm or less, more preferably 40 mm or more and 150 mm or less. L, as shown in FIG. 3, is the distance in the Y-axis direction between the centerlines of the thread _- like spacers 22N. The intervals may be equal intervals or unequal intervals. In the latter case, L may be the maximum value. Self-weight deflection is maximum when L is maximum.

Although details will be described in the section of Examples, the present inventors have found through experiments and the like that if the following formula (1) is established, the contact between the glass plate 21 _N and the glass plate 21 _N+1 due to deflection under its own weight will occur in a stationary state. can be suppressed, and the occurrence of scratches can be suppressed. The stationary state is, for example, the state when the glass package 1 is stored in a warehouse or the like.

上記式（１）中、σ１（μｍ）は、自重たわみの理論値である。理論値は、矩形状のガラス板の両端（両端の間隔はＬに等しい）を下方から支持したときの、両端に対する中点の高低差として算出する。上記式（１）において、Ｉ（ｍｍ^４）はガラス板２１_Ｎの断面二次モーメントを、ｗ（Ｎ／ｍｍ）はガラス板２１_Ｎの単位長さ当たりの自重を表す。

In the above formula (1), σ1 (μm) is the theoretical value of self-weight deflection. The theoretical value is calculated as the difference in height between the two ends of a rectangular glass plate (with the distance between the two ends being equal to L) supported from below. In the above formula (1), I (mm ⁴ ) represents the second moment of area of the glass plate 21N, and w ( _N /mm) represents the weight per unit length of the glass plate _21N .

If the thickness _H of the thread-like spacer 22N is greater than the theoretical value σ1 of the self-weight deflection of the glass plate _21N , it is considered that the glass plate _21N does not come into contact with the glass plate 21N ₊₁ below or the pallet 3 below.

However, as a result of investigation by the inventors, even when the thickness _H of the thread-like spacers 22N is smaller than the theoretical value σ1 of the self-weight deflection of the glass plate _21N , the glass plate _21N is more than the glass plate _21N+1 below. Or it turned out that it may not contact with the lower pallet 3. According to research conducted by the inventors, if the thickness _H of the thread-like spacer 22N is 0.8 times or more of the theoretical value σ1, the glass plate _21N does not contact the lower glass plate _21N+1 or the lower pallet 3. I found out.

This means that the actual value of self-weight deflection of the glass plate _21N is smaller than the theoretical value σ1. This is presumed to be due to the following four reasons (A) to (D).

(A) The theoretical value σ1 of self-weight deflection is based on the assumption that the filamentous spacers 22N support the glass plate _{21N at} points, but actually support them at surfaces. For example, even if the filamentous spacers _22N have a circular cross section when no load is applied, they are deformed by the load applied to the filamentous spacers _{22N and support the glass plate 21N on} the surface. In the case of surface support, the distance L between the thread _- like spacers 22N is smaller than in the case of point support.

(B) The theoretical value σ1 of self _- weight deflection does not consider the friction between the filamentous spacer 22N and the glass plate _21N , which are supports, but this is because friction actually occurs. Since the glass plate _21N becomes difficult to move due to the friction, deformation (deflection) of the glass plate _21N is suppressed.

(C) The theoretical value σ1 of self-weight deflection does not consider the upper filamentous spacer 22 _N−1 , but actually the upper filamentous spacer 22 _N−1 pushes both ends of the glass plate 21 _N , and the glass plate 21 This is because the deformation of _N is constrained. As a result, bending of the glass plate _21N is suppressed.

(D) The theoretical value σ1 of self-weight deflection is calculated as the height difference between the middle point of a rectangular glass plate when both ends (the distance between both ends is equal to L) are supported from below, but in reality the glass plate This is because there are a plurality of supporting points between the two ends of . Since the glass plate tends to bend symmetrically about each support point, the amount of deflection is small even if the distance between adjacent support points is the same.

For the above four reasons (A) to (D), the actual value of the self-weight deflection of the glass plate _21N is presumed to be smaller than the theoretical value σ1. Therefore, if the above formula (1) is established, the thickness _H of the thread-like spacer 22N becomes larger than the actual value of deflection under the weight of the upper glass plate _21N . Therefore, the contact between the upper glass plate _21N and the lower glass plate _21N+1 or the lower pallet 3 due to deflection under its own weight can be suppressed, and the occurrence of scratches can be suppressed.

In FIG. 3, the N+1th glass plate _21N+1 exists under the _Nth glass plate 21N, but the pallet 3 may exist instead. In the latter case, it is possible to suppress the contact between the glass plate _21N and the pallet 3 caused by deflection under the weight of the glass plate 21N in a stationary state, thereby suppressing the occurrence of scratches.

Moreover, it is preferable that the above formula (1) holds for the glass plate 21 closest to the pallet 3, that is, the lowest glass plate 21. When the glass plate 21 and the pallet 3 come into contact with each other, the cushioning material on the surface of the pallet 3 may be damaged. In this case, it is necessary to replace the cushioning material on the surface of the pallet 3, which causes great damage. Therefore, the above formula (1) preferably holds for the lowermost glass plate 21 . The same applies to the following formulas (2) to (5).

The above formula (1) may be established for at least one glass plate 21 among the plurality of glass plates 21 constituting the glass laminate 2, but as described above, it is established for the lowermost glass plate 21. is preferable, and it is more preferable that all the glass plates 21 are satisfied. The same applies to the following formulas (2) to (5).

Conventionally, thread-like spacers 22 are used for relatively thick glass plates 21, and the deflection of the glass plate 21 is so small that it can be ignored. It wasn't.

According to the present embodiment, the N-th (N is an integer equal to or greater than 1) glass plate 21 _N from the top and the thread-like spacer 22 _N in contact with the lower surface of the glass plate 21 _N satisfy the above formula (1). Thus, it is possible to suppress the occurrence of scratches due to deflection of the glass plate _21N due to its own weight.

The thinner the thickness t of the glass plate _21N , the more easily the glass plate _21N bends, and the application of the technology of the present disclosure is significant. Therefore, the thickness t of the glass plate _21N is, for example, 2.0 mm or less, preferably 1.2 mm or less, and more preferably 0.6 mm or less. Although the lower limit is not particularly limited, it is preferably 0.05 mm or more, preferably 0.1 mm or more, and more preferably 0.3 mm or more. If the thickness is at least the above lower limit, it can be suitably used as a glass substrate for displays.

Since the glass plate 21 for display or carrier substrate is required to have few defects, the application of the technology of the present disclosure is significant.

The glass plate 21 is horizontally supported by a flat pallet in this embodiment, but may be obliquely supported by a vertical pallet. When the glass plate 21 is supported obliquely, the deflection of the glass plate 21 is smaller than when the glass plate 21 is supported horizontally. Therefore, even when the glass plate 21 is obliquely supported, if the above formula (1) holds, the occurrence of scratches can be suppressed. The same applies to the following formulas (2) to (5).

Further, although details will be described in the section of Examples, the present inventors have found through experiments and the like that if the following formula (2) is established, the glass plate 21 _N and the glass plate 21 _N+1 due to self-weight deflection in a vibrating state contact can be suppressed, and the occurrence of scratches can be suppressed. The vibrating state is, for example, the state when the glass package 1 is transported by a vehicle or the like.

なお、図３では、Ｎ枚目のガラス板２１_Ｎの下に、Ｎ＋１枚目のガラス板２１_Ｎ＋１が存在するが、その代わりにパレット３が存在してもよい。後者の場合、振動状態で、自重たわみに起因するガラス板２１_Ｎとパレット３の接触を抑制でき、傷の発生を抑制できる。

In FIG. 3, the N+1th glass plate _21N+1 exists under the _Nth glass plate 21N, but the pallet 3 may exist instead. In the latter case, it is possible to suppress the contact between the glass plate _21N and the pallet 3 due to deflection under its own weight in a vibrating state, and to suppress the occurrence of scratches.

Next, referring to FIG. 4, the weight of the glass plate 21 N-1 from the first glass plate 21 ₁ from the top to the N-1 (N is an integer of 2 or more) glass plate 21 _N-1 from the top is An example of arrangement of the thread-like spacers 22 for generating a bending moment on the _N -th glass plate 21N from the top will be described.

As shown in FIG. 4, even if the upper thread-like spacer 22 _N−1 and the lower thread-like spacer 22 _N are arranged at different positions in the Y-axis direction with the N-th glass plate 21 _N interposed therebetween. good. In this case, the weights of the glass plates 21 ₁ to 21 _N−1 (hereinafter also referred to as “loaded weight”) generate a bending moment in the glass plate 21 _N.

When the load weight causes the glass plate _21N to generate a bending moment, deflection due to the load weight occurs. Deflection due to load weight is hereinafter also referred to as "three-point bending deflection". As shown in FIG. 4, the three _- point bending deflection is maximized when the upper filamentous spacer 22 _{N- 1} is placed.

Therefore, it is preferable that the following formula (3) holds. If the following formula (3) holds, even if the load weight causes the glass plate _21N to generate a bending moment in a stationary state, the contact between the glass plate _21N and the glass plate _21N+1 can be suppressed, and the occurrence of scratches. can be suppressed.

上記式（３）中、σ２（μｍ）は、３点曲げたわみの理論値である。理論値σ２は、矩形状のガラス板の両端（両端の間隔はＬに等しい）を下方から支持すると共に、両端の中点でガラス板を上方から押したときの、両端に対する中点の高低差として算出する。上記式（３）において、Ｆ（Ｎ）は積載重量である。

In the above formula (3), σ2 (μm) is the theoretical value of three-point bending deflection. Theoretical value σ2 is the difference in height between both ends of a rectangular glass plate when both ends (the distance between both ends is equal to L) are supported from below and the glass plate is pushed from above at the midpoints of both ends. Calculate as In the above formula (3), F(N) is the load weight.

In FIG. 4, the N+1th glass plate _21N+1 exists under the _Nth glass plate 21N, but the pallet 3 may exist instead. In the latter case, even if the load weight causes a bending moment in the glass plate _21N in a stationary state, the contact between the glass plate _21N and the pallet 3 can be suppressed, and the occurrence of damage can be suppressed.

The actual value of the three-point bending deflection is also estimated to be smaller than the theoretical value σ2 for the above three reasons (A), (B) and (D). Therefore, if the above formula (3) is established, the thickness _H of the filamentous spacer 22N becomes larger than the total actual value of the three-point bending deflection and self-weight deflection. Therefore, contact between the upper glass plate _21N and the lower glass plate _21N+1 or the lower pallet 3 can be suppressed, and the occurrence of scratches can be suppressed. Note that the thickness _H of the filamentous spacer 22N may be (σ1+σ2)×1.0 or more. Here, the coefficient "1.0" is a safety coefficient.

By the way, as shown in FIG. 5, one end of each glass plate 21 in the Y-axis direction is a free end that is not fixed. Deflection is therefore caused by the dead weight from the free end to the nearest support point to the free end. This deflection is hereinafter also referred to as "first free end deflection".

Therefore, it is preferable that the following formula (4) holds. If the following formula (4) holds, it is possible to suppress the contact between the glass plate _21N and the glass plate _21N+1 or the pallet 3 due to the bending of the first free end in the stationary state, and to suppress the occurrence of scratches. In the following formula (4), the coefficient "1.2" is a safety coefficient.

上記式（４）中、σ３（μｍ）は、第１自由端たわみの理論値である。上記式（４）において、Ｌ１（ｍｍ）は上からＮ（Ｎは１以上の整数）枚目のガラス板２１_Ｎの第１辺２１１と、第１辺２１１に最も近い糸状スペーサ２２_Ｎの中心線とのＹ軸方向における間隔である。

In the above formula (4), σ3 (μm) is the theoretical value of the deflection of the first free end. In the above formula (4), L1 (mm) is the first side 211 of the _Nth ( _N is an integer of 1 or more) glass plate 21N from the top and the center of the thread-like spacer 22N closest to the first side 211. It is the distance in the Y-axis direction from the line.

Although not shown, the other end in the Y-axis direction of each glass plate 21 is also a free end that is not fixed. Deflection is therefore caused by the dead weight from the free end to the nearest support point to the free end. This deflection is hereinafter also referred to as "second free end deflection".

Therefore, it is preferable that the following formula (5) holds. If the following formula (5) holds, it is possible to suppress the contact between the glass plate _21N and the glass plate _21N+1 due to the bending of the second free end in the stationary state, and to suppress the occurrence of scratches. In the following formula (5), the coefficient "1.2" is a safety coefficient.

上記式（５）中、σ４（μｍ）は、第２自由端たわみの理論値である。上記式（５）において、Ｌ２（ｍｍ）は上からＮ（Ｎは１以上の整数）枚目のガラス板２１_Ｎの第２辺２１２と、第２辺２１２に最も近い糸状スペーサ２２_Ｎの中心線とのＹ軸方向における間隔である。

In the above formula (5), σ4 (μm) is the theoretical value of the deflection of the second free end. In the above formula (5), L2 (mm) is the second side 212 of the _Nth ( _N is an integer of 1 or more) glass plate 21N from the top and the center of the thread-like spacer 22N closest to the second side 212. It is the distance in the Y-axis direction from the line.

Here, in formulas (4) and (5), it is preferable to set the safety factor to "1.5" or more. This is because the glass plate _21N is often broken from the end face. The end face of the glass plate _21N is a cut surface, and if there are fine scratches or cracks on the cut face, the glass plate _21N will break from the end face.

Experimental data will be described below. Examples 1 to 5, 8 to 12, and 14 to 26 below are working examples, and examples 6 to 7, 13, and 27 to 29 are comparative examples.

In Example 1, on a flat pallet, threads parallel to the X-axis direction are arranged in the Y-axis direction at a pitch of 40 mm (L = 40 mm), and a glass plate is placed on it so that the long side of the glass plate is parallel to the X-axis direction. , the glass plate was placed horizontally. The thread was a PE thread with a circular cross-sectional shape in the absence of external force. The glass plate had an X-axis dimension of 470 mm (a = 470 mm), a Y-axis dimension of 370 mm (b = 370 mm), and a Z-axis dimension of 0.5 mm (t = 0.5 mm). .

After that, (1) threads parallel to the X-axis direction are arranged on the glass plate at a pitch of 40 mm in the Y-axis direction, and (2) the long sides of the glass plate are parallel to the X-axis direction. By alternately placing the plates horizontally, a glass package having 20 glass plates was obtained. The 20 glass plates were washed with an alkaline detergent and a disc-shaped brush (hereinafter also referred to as "alkaline cleaning") before loading, and then the surfaces of the glass plates were inspected by an FPD foreign matter inspection machine (manufactured by Toray Engineering Co., Ltd., model : HS-830e) was observed with a microscope attached to the glass plate, and it was confirmed that there were no scratches on the surface of the glass plate.

After that, a load corresponding to a surface pressure of 1.3 kPa was applied to the entire upper surface (470 mm×370 mm) of the uppermost glass plate. At this time, the thickness of the thread placed between the bottom glass plate and the flat pallet was 114 μm (H=114 μm).

Next, using a small vibration tester for transportation test (manufactured by IMV: m120/MA1), a method conforming to Japanese Industrial Standards JIS Z 0232: 2020 (PSD: general road transportation described in Annex A, Random vibration was applied in the vertical direction at an acceleration of 5.9 m/s ² for 30 minutes. After that, the 20 glass plates were unpacked in order from the top while recovering the filamentous spacers. When the glass plates were taken out from the pallet, sticking between the glass plates was not observed.

Next, the glass plate placed at the bottom during loading was washed with an alkali. The surface of the alkali-cleaned glass plate was inspected with the FPD foreign matter inspection machine and the microscope attached to the inspection machine to check for scratches. Hereinafter, simply referred to as "contact damage") was not observed. A contact flaw means a flaw that occurs in a region where the glass plate and the thread-like spacer are not in contact with each other. It is highly probable that the scratches in the region were caused by the contact between the glass plates or the contact between the glass plates and the pallet.

Examples 2 to 29 were conducted under the same conditions as in Example 1 except for the conditions shown in Table 1. In addition, when the glass plates were removed from the pallet after the vibration test, sticking between the glass plates was observed, and in the case where contact scratches were observed, the vibration test was not performed after the glass package was produced. , conducted a test to unpack the glass package. The experimental results of Examples 1 to 29 are shown in Table 1 and FIG.

表１及び図６において、「〇」は、振動試験後にパレットの上からガラス板を取り出す際にガラス板同士の貼り付きが認められず、接触傷も認められなかったことを意味する。また、表１及び図６において、「△」は、振動試験後にパレットの上からガラス板を取り出す際にガラス板同士の貼り付きが認められ、接触傷が認められたが、振動試験を実施しない場合には貼り付きが認められず、接触傷も認められなかったことを意味する。更に、表１及び図６において、「×」は、振動試験を実施しなくても、パレットの上からガラス板を取り出す際にガラス板同士の貼り付きが認められ、接触傷が認められたことを意味する。

In Table 1 and FIG. 6, "◯" means that no sticking between the glass plates was observed when the glass plates were removed from the pallet after the vibration test, and no contact scratches were observed. In addition, in Table 1 and FIG. 6, "△" indicates that the glass plates stuck to each other when the glass plates were taken out from the pallet after the vibration test, and contact scratches were observed, but the vibration test was not performed. In this case, it means that neither sticking nor contact damage was observed. Furthermore, in Table 1 and FIG. 6, "x" indicates that the glass plates stuck to each other when the glass plates were taken out from the pallet without performing the vibration test, and contact scratches were observed. means

From Table 1 and FIG. 6, it can be seen that when the above formula (1) is satisfied, the occurrence of contact scratches can be suppressed in the stationary state. Further, from Table 1 and FIG. 6, it can be seen that when the above formula (2) is satisfied, the occurrence of contact scratches can be suppressed in the vibrating state.

Although the glass laminate and the glass package according to the present disclosure have been described above, the present disclosure is not limited to the above embodiments. Various changes, modifications, substitutions, additions, deletions, and combinations are possible within the scope of the claims. These also naturally belong to the technical scope of the present disclosure.

1 glass package 2 glass laminate 21 glass plate 211 first side 212 second side 213 third side 214 fourth side 22 filamentous spacer 3 pallet

Claims (11)

A glass laminate comprising a plurality of laminated glass plates and a thread-like spacer disposed between the adjacent glass plates or between the glass plate and the pallet,
Each of the glass plates has a rectangular shape in plan view and has a first side and a second side parallel to each other and a third side and a fourth side parallel to each other,
The filamentous spacer extends from at least the third side to the fourth side in a first direction parallel to the first side and the second side, and extends along the third side and the fourth side. spaced apart in a second direction parallel to
The N-th (N is an integer of 1 or more) glass plate from the top has a Young's modulus of E (MPa), a density of ρ (kg/mm ³ ), and a plate thickness of t (mm). , the length of each of the first side and the second side is a (mm),
The filamentous spacer in contact with the lower surface of the Nth glass plate from the top has a thickness of H (μm), and the distance between the center lines of the filamentous spacer in the second direction is L (mm). ,
A glass laminate that satisfies the following formula (1).

The glass laminate according to claim 1, wherein the following formula (2) holds.

The glass laminate according to claim 1 or 2, wherein the following formula (3) holds.

The thread-like spacer abutting on the lower surface of the N-th glass plate from the top is the first side of the N-th (N is an integer equal to or greater than 1) glass plate from the top and is closest to the first side. A distance in the second direction from the center line of the thread-like spacer is L1 (mm),
The glass laminate according to any one of claims 1 to 3, wherein the following formula (4) holds.

The glass laminate according to any one of claims 1 to 4, wherein t is 0.05 mm or more and 2.0 mm or less. The glass laminate according to claim 5, wherein t is 0.05 mm or more and 0.6 mm or less. The glass laminate according to any one of claims 1 to 6, wherein the glass plate is for display. The glass laminate according to any one of claims 1 to 6, wherein the glass plate is a carrier substrate to be bonded with a semiconductor wafer. In the glass plate, each length of the first side and the second side is longer than each length of the third side and the fourth side,
The glass laminate according to any one of claims 1 to 8, wherein the thread-like spacers are provided parallel to the long sides of the glass plate in plan view. A glass package comprising the glass laminate according to any one of claims 1 to 9 and a pallet on which the glass laminate is placed. The glass package according to claim 10, wherein the pallet is a flat pallet that horizontally supports each glass plate.

Images