Glass plate packaging

Abstract

To provide a glass plate package in which glass plates are unlikely to break even if a bending load acts on a glass plate laminate in any direction. [Solution] A glass plate package 1 includes a bottom plate 7 arranged on the bottom side of a glass plate laminate 2 including a plurality of glass plates 4 and a protective sheet 5, and a top plate 6 arranged on the top side, the bottom plate 7 and the top plate 6 being made of cardboard or plastic cardboard, and the grain direction of the bottom plate 7 intersects with the grain direction of the top plate 6. The glass plates 4, the bottom plate 7, and the top plate 6 are rectangular, and the grain direction of the bottom plate 7 is parallel to one of the sides of the glass plate 4.

Description

[Technical field]

[0001] The present invention relates to a glass sheet package. [Background technology]

[0002] Conventionally, when transporting and / or storing glass plates, a glass plate laminate in which glass plates and protective sheets are alternately laminated may be placed in a packaging box, sandwiched between top and bottom panels made of cardboard or plastic cardboard (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2023 / 162638 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in conventional glass sheet packages, cardboard and plastic cardboard have high bending strength in the direction along the grain, but low bending strength in the direction perpendicular to the grain. Therefore, when the grain direction of the top plate and the bottom plate are aligned, there is a risk that the glass sheet will break if a bending load is applied in the direction perpendicular to the grain.

[0005] The present invention has been made in consideration of the current problems described above, and has an object to provide a glass plate package in which the glass plates are less likely to break even if a bending load acts on the glass plate laminate in any direction. [Means for solving the problem]

[0006] The problem to be solved by the present invention is as described above, and the means for solving this problem will now be described.

[0007] In other words, the glass plate package of aspect 1 of the present invention is a glass plate package comprising a bottom plate arranged on the bottom side of a glass plate laminate including a plurality of glass plates and a protective sheet, and a top plate arranged on the top side, wherein the bottom plate and the top plate are made of cardboard or plastic cardboard, and the grain direction of the bottom plate intersects with the grain direction of the top plate. With this configuration, it is possible to prevent a situation in which the direction of the grain of the bottom plate and the direction of the grain of the top plate intersect, causing the plate to become weak in bending in a specific direction.

[0008] In addition, the glass plate package according to aspect 2 of the present invention is characterized in that, in the first aspect, the direction of the grain of the bottom plate is perpendicular to the direction of the grain of the top plate. With this configuration, the direction of the grain in the bottom plate and the direction of the grain in the top plate are perpendicular to each other, making it possible to make the bending rigidity uniform in all directions.

[0009] In addition, the glass plate package according to the third aspect of the present invention is the same as the first or second aspect, except that the glass plate, the bottom plate, and the top plate are rectangular, The direction of the grain of the bottom plate is parallel to any one of the sides of the glass plate. With this structure, when cutting out the top and bottom plates from the raw plastic cardboard board, the edges of the bottom and top plates are parallel to the grain, improving workability during cutting. Also, it is difficult to get the grain direction wrong when packaging.

[0010] Further, the glass plate package according to aspect 4 of the present invention is characterized in that in any one of aspects 1 to 3, the color of the bottom plate is different from the color of the top plate. With this configuration, it becomes easier to distinguish the bottom plate from the top plate, improving workability during packaging. Effect of the Invention

[0011] The present invention has the following advantages: In other words, according to the glass plate package of the present invention, the glass plates are less likely to break even if a bending load acts on the glass plate laminate in any direction. [Brief description of the drawings]

[0012] [Figure 1] FIG. 2 is an exploded perspective view of a glass sheet package according to an embodiment of the present invention; [Diagram 2] 1 is a perspective view showing a glass plate package according to an embodiment of the present invention; [Diagram 3] 1 is a perspective view showing a double-packaged glass package according to an embodiment of the present invention; [Figure 4] 1 is a perspective view showing a triple-packaged glass package according to an embodiment of the present invention; [Diagram 5] FIG. 2 is an exploded perspective view of a glass sheet package according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] [Overall configuration of glass plate package 1] First, the overall structure of a glass plate package 1 embodying the present invention will be described with reference to Figs.

[0014] Fig. 1 is an exploded perspective view showing the main parts of a glass plate package 1 according to an embodiment of the present invention. Fig. 2 is a perspective view showing the overall configuration of the glass plate package 1. As shown in these figures, the glass plate package 1 is formed by bundling a glass plate stack 2 with a bundling member 3. The glass plate stack 2 is formed by stacking a plurality of glass plates 4 in a flat position with protective sheets 5 interposed between each glass plate, and a top plate 6 and a bottom plate 7 are disposed above and below the glass plates 4, respectively. The number of protective sheets 5 interposed between the glass plates 4 may be one or more.

[0015] The glass plate 4 is rectangular, and no thick portion (so-called edge portion) that is thicker than the central region is formed on any of the four sides 4a. The glass plate 4 has a thickness of, for example, 0.01 mm or more and 2 mm or less, and preferably 0.02 mm or more and 0.3 mm or less. The glass plate 4 has an upper limit of a side dimension of, for example, 1000 mm or less, 700 mm or less, or 500 mm or less, and a lower limit of, for example, 300 mm or more, 400 mm or more. The glass plate 4 is used, for example, as glass substrates or cover glass for devices such as panel displays, such as liquid crystal displays, plasma displays, and organic electroluminescence displays; solar cells, lithium ion batteries, digital signage, touch panels, and electronic paper; or as chemically strengthenable cover glass used in mobile devices, such as smartphones, tablets, and notebook PCs, particularly in foldable devices; or as cover glass used in bendable thin-film solar cells and organic electroluminescence lighting; or as glass containers for medical products, window panes, lightweight laminated window glass, and glass for digital signage or glass resin laminates used as protective substrates for protective glasses and the like, but is not limited to these uses.

[0016] The protective sheet 5 is rectangular and has a thickness of 0.025 to 3 mm. The length of each of the four sides 5a of the protective sheet 5 is longer than the length of the corresponding four sides 4a of the glass plate 4. Therefore, the protective sheet 5 protrudes from each of the four sides 4a of the glass plate 4 in a plan view. The protrusion amount of the protective sheet 5 from each of the four sides 4a of the glass plate 4 is preferably 5 mm or more and 150 mm or less. The lower limit of the protrusion amount is more preferably 10 mm or more, and even more preferably 20 mm or more. The upper limit of the protrusion amount is more preferably 100 mm or less, and even more preferably 50 mm or less. Furthermore, the protective sheet 5 is composed of, for example, an interleaf paper (pure pulp paper), a resin sheet (for example, a polyethylene terephthalate film), or a foamed resin sheet. Since the protective sheet 5 is used by laminating it directly onto the glass plate 4, it is preferable that the protective sheet 5 be made of a material that is highly clean relative to the glass plate 4, or a material that has high cushioning properties and is unlikely to scratch the surface, such as an interleaf paper made from 100% pure pulp or a foamable resin sheet.

[0017] Both the top plate 6 and the bottom plate 7 are rectangular and have a thickness of 7 to 15 mm. The top plate 6 is formed in a rectangular shape in a plan view, and has a pair of short sides 6a and a long side 6b longer than the short sides 6a. The bottom plate 7 is formed in a rectangular shape in a plan view, and has a pair of short sides 7a and a long side 7b longer than the short sides 7a. The pair of short sides 6a of the top plate 6 and the pair of short sides 7a of the bottom plate 7 are formed to be equal in length, and the pair of long sides 6b of the top plate 6 and the pair of long sides 7b of the bottom plate 7 are formed to be equal in length.

[0018] The length of each of the short sides 6a, 7a of the top plate 6 and the bottom plate 7 is shorter than the length of the corresponding side 5a of the protective sheet 5. In addition, the length of each of the long sides 6b, 7b of the top plate 6 and the bottom plate 7 is shorter than the length of the corresponding side 5a of the protective sheet 5. Therefore, the protective sheet 5 protrudes from each of the four sides of the top plate 6 and the bottom plate 7 in a plan view.

[0019] Meanwhile, the length of each of the short sides 6a, 7a of the top plate 6 and the bottom plate 7 is longer than the length of the corresponding side 4a of the glass plate 4. Moreover, the length of each of the long sides 6b, 7b of the top plate 6 and the bottom plate 7 is longer than the length of the corresponding side 4a of the glass plate 4. Therefore, there is no portion of the glass plate 4 that protrudes outside the top plate 6 and the bottom plate 7 in a plan view.

[0020] Both the top plate 6 and the bottom plate 7 are made of paper corrugated board or plastic corrugated board. The corrugated board is made of thick paper, and the plastic corrugated board is made of plastic resin such as polypropylene (PP) or polyethylene (PE). The corrugated board and the plastic corrugated board have a wavy internal structure between two flat surfaces. More specifically, the wavy internal structure has a structure in which mountain folds and valley folds are alternately connected, thereby improving the rigidity of the material. By having a wavy internal structure, the corrugated board and the plastic corrugated board can distribute the force evenly when subjected to external pressure or impact, and the entire corrugated board or the plastic corrugated board can efficiently support the load.

[0021] Plastic cardboard has a high bending strength per unit thickness, and can be formed thinly if it has the same bending strength as paper cardboard. This allows the glass plate package 1 itself to be formed compact in size. Furthermore, paper cardboard is less expensive than plastic cardboard. This allows costs to be kept down even when a large number of glass plate packages 1 are manufactured.

[0022] Corrugated cardboard or plastic cardboard has a crease direction, which is the direction in which the crests and valleys of the corrugation extend. Corrugated cardboard or plastic cardboard is very strong against bending in a direction parallel to the crease direction, but is weak in a direction perpendicular to the crease direction.

[0023] In addition, plastic resins such as polypropylene (PP) and polyethylene (PE), which are the materials used for plastic cardboard, have the characteristic of low dust generation, which helps maintain the cleanliness of the target glass sheets during packaging and transportation. Furthermore, plastic resins are highly resistant to water and moisture, and can prevent a decrease in strength due to condensation, etc. Plastic resins can also be formed to be lighter than metals, etc.

[0024] In this embodiment, the binding members 3 are composed of two flexible band-shaped members (e.g., tapes). The two binding members 3 are connected at one end and the other end in the longitudinal direction to form an endless shape, and are wound from the upper surface of the top plate 6 to the lower surface of the bottom plate 7 (details will be described later). These binding members 3 are composed of elastic resin tapes, but may also be composed of rubber bands, cloth belts, etc. Here, having elasticity means that the reversible change in length when a load is applied in the longitudinal direction is 50% or less, more preferably 30% or less, and even more preferably 10% or less. For example, when the glass plate 4 has a thickness of 0.3 mm or less, if the binding member 3 has too much elasticity, the glass plate 4 may deviate from a predetermined position due to vibration or impact during transportation, and the glass plate 4 may be damaged by bending stress. From the viewpoint of simplifying the bundling operation, it is preferable to use tapes that bond to each other but do not bond to the objects to be bound (top plate 6, bottom plate 7, glass plate 4, and protective sheet 5) as the bundling members 3. Hereinafter, this type of tape will be referred to as a self-adhesive tape, but it is also called a self-fusing tape.

[0025] [Manufacturing procedure for glass plate package 1] A procedure for manufacturing a glass plate package 1 according to the present embodiment will be described with reference to Figs. 1 to 5. As shown in Fig. 1, when manufacturing a glass plate package 1, first, two binding members 3 are placed on the floor surface or the like of a work place so as to cross at right angles or substantially at right angles. After that, a bottom plate 7 is placed on the intersection of the two binding members, and a glass plate 4 and a protective sheet 5 are laminated on the bottom plate 7. At this time, one or more protective sheets are placed between the glass plate 4 laminated at the bottom and the bottom plate 7. In addition, one or more protective sheets 5 may be interposed between each pair of glass plates 4. Then, a top plate 6 is placed on the top protective sheet 5 to manufacture a glass plate laminate 2. At this time, one or more protective sheets are placed between the glass plate 4 laminated at the top and the top plate 6. After that, the glass plate laminate 2 is bound by two binding members 3. In this case, if the binding members 3 are made of self-adhesive tape, the intersections of the binding members 3 on the underside of the bottom plate 7 are surface-bonded by the weight of the glass plate laminate 2 without the application of any external force. The two binding members 3 are not twisted at any point.

[0026] 5, the grain direction of the crests and valleys of the wave pattern of the top plate 6 is parallel to the front-to-back direction. The grain direction of the bottom plate 7 is parallel to the left-to-right direction, which is perpendicular to the grain direction of the top plate 6.

[0027] By arranging the grain direction of the top plate 6 parallel to the front-to-back direction, the bending strength in the front-to-back direction is two to three times that of the left-to-right direction. Also, by arranging the grain direction of the bottom plate 7 parallel to the left-to-right direction, the bending strength in the left-to-right direction is two to three times that of the front-to-back direction.

[0028] In this way, the direction of the grain of the bottom plate 7 is oriented perpendicular to the direction of the grain of the top plate 6, so that the bending strength is increased in each of the front-to-back and left-to-right directions, and it is possible to prevent the glass plate package 1 from being weak in bending in a specific direction when it is formed. The strength in all four directions, front-to-back and left-to-right, is constant, and bending resistance to external forces applied from any direction is high.

[0029] When the number of glass sheets packed is increased in order to improve the transportation efficiency, the weight of the glass sheet laminate 2 itself increases. As a result, the top plate 6 and the bottom plate 7 of the glass sheet laminate 2 are easily deformed due to the weight. When the thicknesses of the top plate 6 and the bottom plate 7 are increased, the strength is ensured, but the volume and height of the glass sheet laminate 2 increase, making it difficult to improve the transportation efficiency. Therefore, the direction of the grain of the bottom plate 7 is arranged in a direction perpendicular to the grain direction of the top plate 6, so that the bending strength is increased in the front-rear direction and the left-right direction, respectively, and when the glass sheet laminate 2 is formed, the strength can be ensured without increasing the volume and height.

[0030] In this embodiment, the direction of the grain of the bottom plate 7 is arranged in a direction perpendicular to the direction of the grain of the top plate 6, but the direction of the grain of the bottom plate 7 is not limited to this as long as it is arranged in a direction that is not parallel to the direction of the grain of the top plate 6. For example, the direction of the grain of the bottom plate 7 may be arranged at an angle of 45 degrees from the direction of the grain of the top plate 6.

[0031] Moreover, the top plate 6 has a pair of short sides 6a arranged in the left-right direction, and a pair of long sides 6b arranged in the front-to-back direction. This makes it easier to visually confirm the orientation of the top plate 6, and prevents the grain direction from being erroneously arranged parallel to the left-to-right direction. Moreover, the bottom plate 7 has a pair of short sides 7a arranged in the left-to-right direction, and a pair of long sides 7b arranged in the front-to-back direction. This makes it easier to visually confirm the orientation of the bottom plate 7, and prevents the grain direction from being erroneously arranged parallel to the front-to-back direction.

[0032] The bottom plate 7 may be colored differently from the top plate 6. For example, the bottom plate 7 may be colored red and the top plate 6 may be colored blue. This makes it easier to distinguish between the bottom plate 7 and the top plate 6, improving workability during packaging. The top plate 6 may be colored only on its upper surface, and the bottom plate 7 may be colored only on its lower surface. This can prevent color transfer to the protective sheet 5.

[0033] Also, different parts of the top plate 6 may be colored in different colors. For example, by coloring the pair of short sides 6a of the top plate 6 white and coloring the pair of long sides 6b of the top plate 6 black, it becomes easy to distinguish between the short sides 6a and the long sides 6b, improving workability when placing the top plate 6. Similarly, different parts of the bottom plate 7 may be colored in different colors. For example, by coloring the pair of short sides 7a of the bottom plate 7 white and coloring the pair of long sides 7b of the bottom plate 7 black, it becomes easy to distinguish between the short sides 7a and the long sides 7b, improving workability when placing the bottom plate 7.

[0034] FIG. 3 is an exploded perspective view showing a box body 8, which is a component of the double-packaged glass sheet package according to the embodiment of the present invention.

[0035] 3, the box 8 includes a top cover 8a, four side walls 8b, and a bottom wall 8c. The box 8 is rectangular in plan view. Each of the parts 8a, 8b, and 8c constituting the box 8 is preferably made of a foamed resin plate such as polyurethane, polyethylene, polystyrene, or polypropylene, but may also be made of a laminate of plastic corrugated board, a laminate of paper corrugated board, wood, or the like.

[0036] A notched recess 9 is formed in the inner surface of each of two opposing side walls 8b (the two side walls that are relatively longer in a plan view) among the four side walls 8b, along the vertical direction. In this embodiment, the notched recess 9 is formed over the entire vertical length of each of the two side walls 8b. Therefore, the notched recess 9 can be used to insert the operator's fingers or other supporting means. As shown in the figure, the upper cover 8a is fitted inside the four side walls 8b. With the glass plate package 1 housed in the box 8, the top cover 8a is fitted inside the four side walls 8b to obtain a glass plate double package 11 as shown in Fig. 9. In this embodiment, the four side walls 8b of the glass plate double package 11 are fixed to each other to form a frame. In contrast, the bottom wall 8c may or may not be fixed to the lower surfaces of the four side walls 8b. When the four side walls 8b or the bottom wall 8c are fixed, for example, an adhesive or double-sided tape is used.

[0037] Furthermore, as shown in FIG. 4, the glass plate double package 11 can be stored in another box 12 to obtain a glass plate triple package 13. The other box 12 is made of plastic corrugated board, paper corrugated board, wood, or the like. The thickness of the other box 12 is thin, for example, 1 / 2 or less of the thickness of the top cover 8a, the four side walls 8b, and the bottom wall 8c of the box 8 of the glass plate double package 11. Since the glass plate double package 11 is stored inside the other box 12 in this way, as described above, the bottom wall 8c of the box 8 of the glass plate double package 11 may or may not be fixed to the four side walls 8b. Similarly, the four side walls 8b of the box 8 of the glass plate double package 11 may or may not be fixed as a frame.

[0038] As described above, the glass plate packaging body 1 of the present invention is a glass plate packaging body 1 comprising a bottom plate 7 arranged on the bottom side of a glass plate laminate 2 including a plurality of glass plates 4 and a protective sheet 5, and a top plate 6 arranged on the top side, the bottom plate 7 and the top plate 6 being cardboard or plastic cardboard, and the grain direction of the bottom plate 7 intersects with the grain direction of the top plate 6. By configuring it in this manner, it is possible to prevent a situation in which the direction of the grain of the bottom plate 7 and the direction of the grain of the top plate 6 intersect, causing the plate to become weak in bending in a specific direction.

[0039] Further, the direction of the grain of the bottom plate 7 is perpendicular to the direction of the grain of the top plate 6. With this configuration, the direction of the grain of the bottom plate 7 and the direction of the grain of the top plate 6 are perpendicular to each other, so that the bending rigidity can be made uniform in all directions.

[0040] The glass plate 4 , the bottom plate 7 and the top plate 6 are rectangular, and the direction of the grain of the bottom plate 7 is parallel to one of the sides of the glass plate 4 . With this configuration, when cutting out the top plate 6 and bottom plate 7 from the plastic cardboard material plate, the edges of the bottom plate 7 and top plate 6 are parallel to the grain, improving workability. When cutting diagonally across the grain, it is difficult to insert the blade, making workability poor. Also, it is difficult to misjudge the grain direction when packaging.

[0041] In addition, the color of the bottom plate 7 is different from the color of the top plate 6. This configuration makes it easy to distinguish between the bottom plate 7 and the top plate 6, improving workability during packaging. That is, since workers can easily visually recognize the difference between the bottom plate 7 and the top plate 6, it is possible to prevent mistakes between the bottom plate 7 and the top plate 6, improving workability.

[0042] Although one embodiment of the present invention has been described above, the present invention is in no way limited to such an embodiment, which is merely illustrative, and it is of course possible to embody various other forms within the scope of the gist of the present invention. The scope of the present invention is indicated by the description of the scope of the utility model registration claims, and further includes the equivalent meaning described in the scope of the utility model registration claims, and all modifications within the scope. [Explanation of symbols]

[0043] 1 Glass plate package 2 Glass plate laminate 3 Binding material 4 Glass Plate 4a Edge of glass plate 5 Protective Sheet 6. Tabletop 7 Bottom plate 8 box body 9 Notch recess 11 Glass plate double-packed 12 Box body 13 Glass plate triple-packed

Claims

1. A glass plate package including a bottom plate arranged on a bottom surface side of a glass plate laminate including a plurality of glass plates and a protective sheet, and a top plate arranged on a top surface side thereof, The bottom plate and the top plate are made of cardboard or plastic cardboard, A glass plate package, characterized in that the direction of the grain of the bottom plate intersects with the direction of the grain of the top plate.

2. 2. The glass sheet package according to claim 1, wherein the direction of the creases in the bottom plate is perpendicular to the direction of the creases in the top plate.

3. The glass plate, the bottom plate, and the top plate are rectangular, 3. The glass plate package according to claim 1, wherein the direction of the creases in the bottom plate is parallel to any one of the sides of the glass plate.

4. The glass plate package according to claim 1 or 2, wherein the bottom plate has a color different from the color of the top plate.

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