Glass packaging
The glass laminate with strategically arranged thread-like spacers addresses sagging issues in thinner glass plates, preventing scratches and enhancing glass quality while promoting spacer reuse.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- AGC INC
- Filing Date
- 2021-03-30
- Publication Date
- 2026-07-02
- Estimated Expiration
- Not applicable · inactive patent
Smart Images
Figure 0007883835000012 
Figure 0007883835000013 
Figure 0007883835000014
Abstract
Description
[Technical Field]
[0001] This disclosure relates to glass laminates and glass packaging. [Background technology]
[0002] Glass plates are transported in stacks for efficiency. If adjacent glass plates come into contact with each other, scratches will occur. Therefore, interleaving paper is placed between adjacent glass plates (see, for example, Patent Document 1).
[0003] In recent years, the demand for laminating paper has increased, and its price has risen. Furthermore, when laminating paper is used, foreign components other than cellulose contained in the laminating paper, such as nylon, polyester, EVA, and acrylic resins, may adhere to the glass plate. These cannot be removed even by washing the glass plate, which can make it difficult to use the glass plate.
[0004] Patent Document 2 discloses the use of a thread-like spacer instead of interleaving paper as a spacer to be interposed between glass plates. Unlike interleaving paper, the thread-like spacer contacts only a portion of the bottom or top surface of the glass plate, rather than the entire surface. Therefore, it can suppress the adhesion of foreign matter to the glass plate. Also, unlike interleaving paper, the thread-like spacer can be collected and reused after use. Therefore, it can save resources. [Prior art documents] [Patent Documents]
[0005] [Patent Document 1] Japanese Patent Publication No. 2017-186729 [Patent Document 2] Japanese Patent Publication No. 2007-230610 [Overview of the Initiative] [Problems that the invention aims to solve]
[0006] The thread-like spacer contacts only a portion of the underside of the upper glass plate, not the entire surface. Therefore, the upper glass plate could sag under its own weight and come into contact with the lower glass plate or pallet. This problem was more pronounced with thinner glass plates, as thinner glass plates are more prone to sagging.
[0007] Conventionally, thread-like spacers have been used for relatively thick glass plates, and the deflection of the glass plate was negligibly small, so the occurrence of scratches caused by the deflection of the glass plate had not been considered as an issue.
[0008] One aspect of this disclosure provides a technique for suppressing the occurrence of scratches caused by the deflection of a glass plate when using a thread-like spacer. [Means for solving the problem]
[0009] A glass laminate according to one aspect of the present disclosure comprises a plurality of stacked glass plates and thread-like spacers disposed between adjacent glass plates or between the glass plates and a pallet. Each glass plate is rectangular in plan view and has a first and second side and a third and fourth side that are parallel to each other. The thread-like spacers extend at least from the third to the fourth side in a first direction parallel to the first and second sides, and are spaced apart in a second direction parallel to the third and fourth sides. The Nth glass plate from the top (where N is an integer of 1 or more) has a Young's modulus of E (MPa) and a density of ρ (kg / mm²). 3 The glass plate has a thickness of t (mm) and the lengths of the first and second sides are a (mm). The thread-like spacer that contacts the bottom surface of the Nth glass plate from the top has a thickness of H (μm) and the distance between the centerlines of the thread-like spacers in the second direction is L (mm). The following equation (1) holds true when t is 0.6 mm or less, a is 1800 mm or more, L is 150 mm or less. The glass plate has a first side and a second side, each longer than the third side and a fourth side, each longer than the third side and a fourth side. The thread-like spacers are provided parallel to the longer sides of the glass plate in a plan view.
[0010]
number
[0011] According to one aspect of this disclosure, the Nth glass plate from the top (where N is an integer of 1 or more) and the thread-like spacer that abuts the lower surface of the Nth glass plate from the top satisfy formula (1) above. Therefore, the thickness of the thread-like spacer becomes greater than the deflection of the upper glass plate. Consequently, contact between the upper glass plate and the lower glass plate or pallet can be suppressed, and the occurrence of scratches can be suppressed. [Brief explanation of the drawing]
[0012] [Figure 1] Figure 1 is a perspective view showing a glass packaging body according to one embodiment. [Figure 2] Figure 2 is a plan view showing an example of the arrangement of the Nth glass plate from the top and the thread-like spacers that contact the underside of the glass plate. [Figure 3] Figure 3 is a cross-sectional view showing an example of a thread-like spacer arrangement where the weight of the glass plates from the top 1st plate 21 to the N-1st plate (where N is an integer greater than or equal to 2) does not generate a bending moment in the Nth glass plate from the top. [Figure 4] Figure 4 is a cross-sectional view showing an example of a thread-like spacer arrangement in which the weight of the glass plates from the top, starting from the first glass plate 21, up to the N-1 (where N is an integer greater than or equal to 2) glass plate from the top generates a bending moment in the Nth glass plate from the top. [Figure 5] Figure 5 is a cross-sectional view showing an enlarged view of one end of the glass plate in the Y-axis direction. [Figure 6] Figure 6 shows an example of the relationship between the spacing of the thread-like spacers and the deflection and contact of the glass plate. [Modes for carrying out the invention]
[0013] Embodiments of this disclosure will be described below with reference to the drawings. In each drawing, the same or corresponding components are denoted by the same reference numerals, and their descriptions may be omitted. In each drawing, the X-axis, Y-axis, and Z-axis directions are perpendicular to each other, the X-axis and Y-axis directions are horizontal, and the Z-axis direction is vertical.
[0014] First, with reference to Figure 1, the glass packaging body 1 according to this embodiment will be described. The glass packaging body 1 comprises a glass laminate 2 and a pallet 3 on which the glass laminate 2 is placed. The glass laminate 2 comprises a plurality of stacked glass plates 21 and thread-like spacers 22 placed between adjacent glass plates 21 or between the glass plates 21 and the pallet 3.
[0015] The multiple glass plates 21 have, for example, the same shape and dimensions. The number of glass plates 21 included in the glass laminate 2 is not particularly limited, but is, for example, 50 to 800 plates, preferably 120 to 600 plates, and more preferably 140 to 250 plates.
[0016] The glass plate 21 is, for example, for display purposes, and more specifically, it is a substrate or cover glass on which a TFT (Thin Film Transistor) or color filter is formed. The glass plate 21 may also be a semiconductor wafer such as a silicon wafer, or a carrier substrate bonded to a semiconductor chip.
[0017] The carrier substrate, for example, is bonded to the semiconductor wafer before thinning, and reinforces the semiconductor wafer during thinning. After thinning, the semiconductor wafer and the carrier substrate are separated.
[0018] Alternatively, the carrier substrate may be bonded to the multiple semiconductor chips and positioned before the multiple semiconductor chips are sealed with resin. After the multiple semiconductor chips are sealed with resin, the multiple semiconductor chips and the carrier substrate are separated.
[0019] The thread-like spacers 22 are placed between adjacent glass plates 21 to suppress the occurrence of scratches. Additionally, the thread-like spacers 22 are placed between the glass plate 21 and the pallet 3 to suppress the occurrence of scratches.
[0020] Unlike interleaving paper, the thread-like spacer 22 contacts only a portion of the bottom or top surface of the glass plate 21, rather than the entire surface. Therefore, it can suppress the adhesion of foreign matter to the glass plate 21 and improve the quality of the glass plate 21. Since a high degree of cleanliness is required for glass plates 21 used for displays or carrier substrates, the thread-like spacer 22 is suitable.
[0021] Furthermore, unlike interleaving paper, the thread-like spacers 22 can be collected and reused after use. Therefore, resources can be saved. The thread-like spacers 22 may be washed before reuse. Washing can remove any foreign matter adhering to the thread-like spacers 22.
[0022] The cross-sectional shape of the thread-like spacer 22 may be circular or rectangular. When the cross-sectional shape of the thread-like spacer 22 is rectangular, the glass plate 21 can be supported more stably than when it is circular. When the cross-sectional shape of the thread-like spacer 22 is circular, the contact area with the glass plate 21 is smaller than when it is rectangular, and it is thought that the adhesion of foreign matter to the glass plate 21 can be further suppressed.
[0023] The material of the thread-like spacer 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, for example, rayon, cupro, acetate fibers, polyethylene (PE) fibers, nylon fibers, polyester fibers, polyamide fibers, polyimide fibers, acrylic fibers, polyarylate fibers, poly(p-phenylenebenzobisoxazole) (PBO) fibers, polybenzimidazole (PBI) fibers, polyphenylene sulfide (PPS) fibers, fluorine fibers, and carbon fibers. The thread-like spacer 22 may be a monofilament or a multifilament, or a twisted yarn made by twisting multiple threads together. It may also be a yarn made by combining multiple types of the aforementioned fibers.
[0024] Pallet 3 is a flat pallet that horizontally supports each glass plate 21. In this embodiment, pallet 3 is a flat pallet, but it may also be a vertical pallet. A vertical pallet supports each glass plate 21 diagonally.
[0025] Next, with reference to Figure 2, the arrangement of the Nth (N is an integer of 1 or more) glass plate 21 from the top and the thread-like spacer 22 that abuts the lower surface of the glass plate 21 according to this embodiment will be described. As shown in Figure 2, the glass plate 21 is rectangular in plan view and has a first side 211 and a second side 212 that are parallel to each other, and a third side 213 and a fourth side 214 that are parallel to each other.
[0026] In this specification, "plan view" means viewing the glass plate 21 from a direction perpendicular to the main surface. For example, if the glass plate 21 is supported horizontally, "plan view" means viewing it from the Z-axis direction.
[0027] The lengths a of the first side 211 and the second side 212, and the lengths b of the third side 213 and the fourth side 214, may be the same or different. In other words, the rectangle may be a square or not. Furthermore, the rectangle may include a shape with chamfered corners.
[0028] The thread-like spacers 22 extend at least from the third side 213 to the fourth side 214 in a first direction (e.g., the X-axis direction) parallel to the first side 211 and the second side 212, and are arranged at intervals in a second direction (e.g., the Y-axis direction) parallel to the third side 213 and the fourth side 214.
[0029] For example, multiple thread-like spacers 22 are arranged at intervals in the Y-axis direction. Although not shown in the figures, the thread-like spacers 22 may have U-shaped folded portions at one or both ends in the Y-axis direction, or they may be arranged in a zigzag pattern. In other words, a single thread-like spacer 22 may have multiple straight sections arranged at intervals in the Y-axis direction, and folded portions connecting adjacent straight sections in the Y-axis direction.
[0030] The length a of each of the first side 211 and the second side 212 of the glass plate 21 may be longer than the length b of each of the third side 213 and the fourth side 214. That is, in plan view, the glass plate 21 may have a long side and a short side.
[0031] When the glass plate 21 has a long side and a short side in plan view, the filamentous spacer 22 may be provided parallel to the long side. Compared with the case where the filamentous spacer 22 is provided parallel to the short side, the number of the filamentous spacers 22 or the number of the folded portions of the filamentous spacer 22 can be reduced.
[0032] Next, referring to FIG. 3, an example of the arrangement of the filamentous spacers 22 that does not generate a bending moment on the Nth glass plate 21 from the first glass plate 211 from the top to the (N - 1)th glass plate 21 (N is an integer of 2 or more) will be described. In FIG. 3, 22 N-1 represents the filamentous spacer that abuts on the lower surface of the (N - 1)th glass plate 21 from the top, and 22 N represents the filamentous spacer that abuts on the lower surface of the Nth glass plate 21. N-1 is the (N - 1)th glass plate 21 from the top N-1 and 22 N is the Nth glass plate 21 from the top N and represents the filamentous spacer that abuts on the lower surface.
[0033] As shown in FIG. 3, sandwiching the Nth glass plate 21 N the upper filamentous spacer 22 N-1 and the lower filamentous spacer 22 N may be arranged at the same position in the Y-axis direction. In this case, the weight of the glass plates 211 to 21 N-1 does not generate a bending moment on the glass plate 21 N . In this case, the glass plate 21 N deflects only by its own weight. Of course, the first glass plate 211 from the top also deflects only by its own weight. Therefore, N may be 1.
[0034] The deflection caused by the self-weight of the Nth (N is a natural number of 1 or more) glass plate 21 from the top is also referred to as self-weight deflection. The self-weight deflection is mainly (1) the Nth glass plate 21 from the top N N The following parameters relating to (2) the Nth glass plate 21 from the top N Thread-like spacer 22 that contacts the lower surface N It is determined by the following parameters.
[0035] (1) Glass plate 21 N The Young's modulus is E (MPa) and the density is ρ (kg / mm³). 3 ) and the plate thickness is t (mm), and the lengths of the first side 211 and the second side 212 are a (mm). E is, for example, 60,000 MPa or more and 110,000 MPa or less, preferably 65,000 MPa or more and 95,000 MPa or less, and more preferably 70,000 MPa or more and 90,000 MPa or less. ρ is, for example, 2.2 × 10 -6 kg / mm 3 3.0 x 10 -6 kg / mm 3 The following, preferably 2.3 × 10 -6 kg / mm 3 The above 2.8 × 10 -6 kg / mm 3 More preferably 2.4 × 10 -6 The above 2.7 × 10 -6 The following applies: 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, and even more preferably 1800 mm or more and 3300 mm or less.
[0036] (2) Thread-like spacer 22 N The thickness is H (μm), and the thread-like spacer 22 N The spacing 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, and more preferably 200 μm or more and 500 μm or less. H is glass plate 211~21 N The weight of the thread-like spacer 22 NThe measurement is taken while the device is in contact with the device. L is, for example, 2 mm to 500 mm, preferably 20 mm to 300 mm, and more preferably 40 mm to 150 mm. L is measured in the same way as shown in Figure 3, with the thread-like spacer 22 N This is the distance in the Y-axis direction between the centerlines. This distance can be equal or unequal. In the latter case, L may be the maximum value. When L is at its maximum, the deflection due to the weight of the structure is at its maximum.
[0037] As will be explained in detail in the Examples section, the inventors have found through experiments, etc., that if the following formula (1) holds true, then in a stationary state, the glass plate 21 due to self-weight deflection N and glass plate 21 N+1 We found that contact can be suppressed, and the occurrence of scratches can be suppressed. The stationary state is, for example, the state when glass packaging 1 is stored in a warehouse or the like.
[0038]
number
[0039] Glass plate 21 N The theoretical value of the deflection due to its own weight σ1 is greater than the thread-like spacer 22 N If the thickness H is thick, glass plate 21 N The lower glass plate 21 N+1 Alternatively, it is thought that it will not come into contact with the lower pallet 3.
[0040] However, the inventors found that the glass plate 21 N The theoretical value of the deflection due to its own weight σ1 is greater than the thread-like spacer 22 N Even when the thickness H is small, the glass plate 21 NThe lower glass plate 21 N+1 Alternatively, it was found that there are cases where it does not come into contact with the lower pallet 3. The inventors investigated and found that the filamentous spacer 22 N If the thickness H is 0.8 times or more of the theoretical value σ1, then the glass plate 21 N The lower glass plate 21 N+1 Alternatively, it was found that it does not come into contact with the lower pallet 3.
[0041] This is a glass plate 21 N The actual value of the self-weight deflection is smaller than the theoretical value σ1. This is presumed to be due to the following four reasons (A) to (D).
[0042] (A) The theoretical value of self-weight deflection σ1 is given by the thread-like spacer 22 N glass plate 21 N Although it is assumed that it is supported at a point, in reality it is supported by a surface. For example, filamentous spacer 22 N Even if the cross-section is circular under no load, the thread-like spacer 22 N The glass plate 21 deforms under the load applied to it. N It is supported by a surface. When supported by a surface, compared to when supported by a point, the thread-like spacer 22 N The distance L between them becomes smaller.
[0043] (B) The theoretical value of self-weight deflection σ1 is given by the thread-like spacer 22 which is the support. N and glass plate 21 N Although friction is not taken into account, it actually occurs. Friction causes the glass plate 21 N Because it becomes difficult to move, glass plate 21 N The deformation (bending) is suppressed.
[0044] (C) The theoretical value of the self-weight deflection σ1 is the upper thread-like spacer 22 N-1 Although this is not taken into consideration, in reality the upper thread-like spacer 22 N-1 glass plate 21 N Press both ends of the glass plate 21 N This is because the deformation of the glass plate 21 is constrained. NThe deflection is suppressed.
[0045] (D) The theoretical value σ1 of the self-weight deflection is calculated as the height difference of the midpoint relative to both ends when both ends of a rectangular glass plate (the distance between the ends is equal to L) are supported from below. However, in reality, there are multiple support points between the ends of the glass plate. Since the glass plate tends to deflect symmetrically around each support point, the amount of deflection will be smaller even if the distance between adjacent support points is the same.
[0046] For the four reasons (A) to (D) above, the glass plate 21 N It is presumed that the actual value of the self-weight deflection will be smaller than the theoretical value σ1. Therefore, if the above equation (1) holds, the thread-like spacer 22 N The upper glass plate 21 has a thickness H. N The deflection due to its own weight will be greater than the actual value. Therefore, the upper glass plate 21 N and the lower glass plate 21 N+1 Alternatively, contact with the lower pallet 3 can be suppressed, thereby preventing damage.
[0047] Note that in Figure 3, the Nth glass plate 21 N Below, the N+1th glass plate 21 N+1 Although such a glass plate exists, a pallet 3 may exist instead. In the latter case, in a stationary state, the glass plate 21 deflects due to its own weight. N This prevents contact between the pallet 3 and the pallet 3, thereby preventing scratches.
[0048] Furthermore, it is preferable that equation (1) above holds true for the glass plate 21 closest to the pallet 3, that is, the bottom glass plate 21. If the glass plate 21 and the pallet 3 come into contact, the cushioning material on the surface of the pallet 3 may be damaged. In this case, the cushioning material on the surface of the pallet 3 needs to be replaced, resulting in significant damage. Therefore, it is preferable that equation (1) above holds true for the bottom glass plate 21. The same applies to equations (2) to (5) below.
[0049] The above equation (1) only needs to hold true for at least one of the multiple glass plates 21 that make up the glass laminate 2, but as mentioned above, it is preferable that it holds true for the bottommost glass plate 21, and more preferably for all of the glass plates 21. The same applies to the following equations (2) to (5).
[0050] Conventionally, thread-like spacers 22 have been used with relatively thick glass plates 21, and the deflection of the glass plate 21 has been negligibly small, so the occurrence of scratches caused by the deflection of the glass plate 21 has not been considered as an issue.
[0051] According to this embodiment, the Nth (where N is an integer greater than or equal to 1) glass plate 21 from the top N And the glass plate 21 N Thread-like spacer 22 that contacts the lower surface N When the above equation (1) is satisfied, the glass plate 21 N This can suppress the occurrence of damage caused by the deflection due to its own weight.
[0052] Glass plate 21 N The thinner the thickness t, the glass plate 21 N The glass plate 21 is prone to bending, and therefore the application of the technology disclosed herein is highly significant. N The thickness t is, for example, 2.0 mm or less, preferably 1.2 mm or less, and more preferably 0.6 mm or less. The lower limit is not particularly limited, but preferably 0.05 mm or more, preferably 0.1 mm or more, and more preferably 0.3 mm or more. If the thickness is above the lower limit, it can be suitably used as a glass substrate for displays.
[0053] Since glass plates 21 for displays or carrier substrates are required to have few defects, there is great significance in applying the technology of this disclosure.
[0054] In this embodiment, the glass plate 21 is horizontally supported by a flat pallet, but it may be obliquely supported by a vertical pallet. When the glass plate 21 is obliquely supported, the deflection of the glass plate 21 is smaller than when it is horizontally supported. 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).
[0055] Specifically, although it will be described in the column of Examples, the inventor has found that, through experiments and the like, if the following formula (2) holds, in the vibrating state, the contact between the glass plate 21 N and the glass plate 21 N+1 due to self-weight deflection 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.
[0056]
Number
[0057] Next, referring to FIG. 4, an example of the arrangement of the filamentous spacers 22 that causes the weight of the first glass plate 211 from the top to the (N - 1)th glass plate 21 N-1 [[ID=2**********]]the (N)th glass plate 21 N will be described. <00**********]]<00**********]]<00**********]]As shown in FIG. 4, sandwiching the Nth glass plate 21i N the upper filamentous spacer 22 N-1 and the lower filamentous spacer 22 N may be arranged at different positions in the Y-axis direction. In this case, the glass plates 211 to 21 N-1The weight (hereinafter also referred to as "loading weight") causes a bending moment in the glass plate 21 N to occur.
[0059] When the loading weight causes a bending moment in the glass plate 21 N to occur, deflection due to the loading weight occurs. The deflection due to the loading 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 ) is arranged at a position equidistant from two adjacent fulcrums (the lower filamentous spacer 22 N-1 ) in the Y-axis direction.
[0060] Therefore, it is preferable that the following formula (3) holds. If the following formula (3) holds, even when the loading weight causes a bending moment in the glass plate 21 N in the stationary state, the contact between the glass plate 21 N and the glass plate 21 N+1 can be suppressed, and the occurrence of scratches can be suppressed.
[0061]
Equation
[0062] In FIG. 4, below the Nth glass plate 21 N , the (N + 1)th glass plate 21 N+1 exists, but instead, the pallet 3 may exist. In the latter case, even when the loading weight causes a bending moment in the glass plate 21 N in the stationary state, the contact between the glass plate 21 N and the pallet 3 can be suppressed, and the occurrence of scratches can be suppressed.
[0063] The actual deflection value when bent at three points is also estimated to be smaller than the theoretical value σ² due to the three reasons (A), (B), and (D) above. Therefore, if equation (3) above holds, the thread-like spacer 22 N The thickness H becomes greater than the actual value of the sum of the deflection from the three-point bending and the deflection due to its own weight. Therefore, the upper glass plate 21 N and the lower glass plate 21 N+1 Alternatively, contact with the lower pallet 3 can be suppressed, thereby preventing damage. Note that the thread-like spacer 22 N The thickness H may be greater than or equal to (σ1 + σ2) × 1.0. Here, the coefficient "1.0" is the safety factor.
[0064] Incidentally, as shown in Figure 5, one end of each glass plate 21 in the Y-axis direction is a free end that is not fixed. Therefore, deflection occurs due to the weight of the glass plate from the free end to the support point closest to the free end. This deflection will hereafter be referred to as the "first free end deflection".
[0065] Therefore, it is preferable that the following equation (4) holds. If the following equation (4) holds, in a stationary state, the glass plate 21 due to the deflection of the first free end N and glass plate 21 N+1 Alternatively, contact with pallet 3 can be suppressed, thereby preventing damage. In equation (4) below, the coefficient "1.2" is the safety factor.
[0066]
number
[0067] Although not shown in the diagram, the other end of each glass plate 21 in the Y-axis direction is also an unfixed free end. Therefore, deflection occurs due to the weight of the glass plate from one free end to the support point closest to the free end. This deflection will hereafter be referred to as the "second free end deflection."
[0068] Therefore, it is preferable that the following equation (5) holds. If the following equation (5) holds, in a stationary state, the glass plate 21 due to the deflection of the second free end N and glass plate 21 N+1 Contact can be suppressed, and the occurrence of damage can be suppressed. In equation (5) below, the coefficient "1.2" is the safety factor.
[0069]
number
[0070] Here, in equations (4) and (5), it is preferable to set the safety factor to "1.5" or higher. This is because the glass plate 21 N This is because it often breaks from the edge. Glass plate 21 N The end face is the cut surface, and if there are fine scratches or cracks on the cut surface, glass plate 21 N It breaks from the end face. [Examples]
[0071] The experimental data is described below. Examples 1 to 5, 8 to 12, and 14 to 26 are examples, and examples 6 to 7, 13, and 27 to 29 are comparative examples.
[0072] In Example 1, threads parallel to the X-axis were arranged on a flat pallet at 40mm intervals along the Y-axis (L=40mm), and a glass plate was placed horizontally on top of them so that its long side was parallel to the X-axis. The threads were made of PE and had a circular cross-section when no external force was acting on them. The glass plate had an X-axis dimension of 470mm (a=470mm), a Y-axis dimension of 370mm (b=370mm), and a Z-axis dimension of 0.5mm (t=0.5mm).
[0073] Subsequently, (1) threads parallel to the X-axis were arranged on the glass plate at 40 mm intervals along the Y-axis, and (2) the glass plate was placed horizontally so that its long side was parallel to the X-axis. These steps were repeated alternately to obtain a glass packaging body containing 20 glass plates. The 20 glass plates were washed with an alkaline detergent and a disc-shaped brush before stacking (hereinafter also referred to as "alkaline washing"), and the surface of the glass plates was observed with a microscope attached to an FPD foreign object inspection machine (manufactured by Toray Engineering Co., Ltd., model: HS-830e) to confirm that there were no scratches on the surface of the glass plates.
[0074] Subsequently, a load equivalent to a surface pressure of 1.3 kPa was applied to the entire top surface (470 mm x 370 mm) of the top 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).
[0075] Next, using a small vibration testing machine for transport testing (IMV: m120 / MA1), a method compliant with Japanese Industrial Standard JIS Z 0232:2020 (PSD: General road transport as described in Annex A, acceleration 5.9 m / s²) was used. 2 Random vibrations were applied vertically for 30 minutes. Afterwards, the 20 glass plates were unpacked from top to bottom while collecting the thread-like spacers. No sticking of the glass plates to each other was observed when removing them from the pallet.
[0076] Next, the glass plate placed at the bottom during loading was subjected to alkaline cleaning. The surface of the alkaline-cleaned glass plate was inspected using the FPD foreign object inspection machine and the microscope attached to the inspection machine to check for scratches. No scratches caused by contact between glass plates or between glass plates and pallets (hereinafter simply referred to as "contact scratches") were found. Contact scratches refer to scratches that occurred in areas where the glass plate and the thread-like spacer were not in contact. Scratches that occurred in the aforementioned areas are highly likely to have been caused by contact between glass plates or between glass plates and pallets.
[0077] Examples 2 to 29 were conducted under the same conditions as Example 1, except for the conditions shown in Table 1. In cases where sticking between glass plates was observed when removing them from the pallet after the vibration test, and contact scratches were found, an additional test was conducted by unpacking the glass packaging without performing a vibration test after the glass packaging was prepared. The experimental results for Examples 1 to 29 are shown in Table 1 and Figure 6.
[0078] [Table 1] In Table 1 and Figure 6, "○" means that when the glass plates were removed from the pallet after the vibration test, no sticking between them was observed, and no contact scratches were found. Also, in Table 1 and Figure 6, "△" means that when the glass plates were removed from the pallet after the vibration test, sticking between them and contact scratches were observed, but when the vibration test was not performed, neither sticking nor contact scratches were observed. Furthermore, in Table 1 and Figure 6, "×" means that even without performing the vibration test, sticking between the glass plates and contact scratches were observed when the glass plates were removed from the pallet.
[0079] Table 1 and Figure 6 show that when equation (1) is satisfied, the occurrence of contact scratches can be suppressed in a stationary state. Furthermore, Table 1 and Figure 6 show that when equation (2) is satisfied, the occurrence of contact scratches can be suppressed in a vibrating state.
[0080] The glass laminates and glass packaging bodies described above are not limited to the embodiments described herein. Various changes, modifications, substitutions, additions, deletions, and combinations are possible within the scope of the claims. These also naturally fall within the technical scope of this disclosure. [Explanation of Symbols]
[0081] 1. Glass packaging 2 Glass Laminate 21 Glass plate 211 First side 212 Second side 213 Third side 214 Fourth side 22 Thread-like spacers 3 Palettes
Claims
1. A glass laminate comprising a plurality of stacked glass plates and thread-like spacers placed between adjacent glass plates or between the glass plates and a pallet, The pallet on which the glass laminate is placed, A glass packaging body comprising, Each of the glass plates, in plan view, is rectangular and has a first and second side that are parallel to each other, and a third and fourth side that are parallel to each other. The thread-like spacers extend at least from the third side to the fourth side in a first direction parallel to the first and second sides, and are arranged at intervals in a second direction parallel to the third and fourth sides. The Nth (where N is an integer greater than or equal to 1) glass plate from the top has a Young's modulus of E (MPa) and a density of ρ (kg / mm³). ３ ) and the plate thickness is t (mm), and the lengths of the first side and the second side are a (mm), The thread-like spacer that abuts 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 thread-like spacers in the second direction is L (mm). The above t is 0.6 mm or less, the above a is 1800 mm or more, the above L is 150 mm or less, and the following formula (1) holds true. The glass plate is such that the length of each of the first and second sides is longer than the length of each of the third and fourth sides. In a plan view, the thread-like spacer is provided parallel to the long side of the glass plate. The H is 100 μm or more and 800 μm or less. The aforementioned pallet is a flat pallet that horizontally supports each of the aforementioned glass plates, in a glass packaging body. [Math 1]
2. The glass packaging body according to claim 1, wherein the following formula (2) is true. [Math 2]
3. A glass packaging body according to claim 1 or 2, wherein the following formula (3) is satisfied. [Math 3]
4. The thread-like spacer that abuts the lower surface of the Nth glass plate from the top has a distance of L1 (mm) between the first edge of the Nth (where N is an integer of 1 or more) glass plate from the top and the center line of the thread-like spacer closest to the first edge in the second direction. A glass packaging body according to any one of claims 1 to 3, wherein the following formula (4) is satisfied. [Math 4]
5. The glass packaging body according to any one of claims 1 to 4, wherein the aforementioned t is 0.05 mm or more.
6. The glass plate is for display purposes, as described in any one of claims 1 to 5.
7. The glass packaging according to any one of claims 1 to 5, wherein the glass plate is a carrier substrate bonded to a semiconductor wafer.