Glass plate packing body

Abstract

The utility model provides a glass plate packing body, which is provided with a glass plate laminated body formed by laminating a plurality of glass plates and a tray for holding the glass plate laminated body in a loading state, and protective sheets are respectively clamped between a pair of adjacent glass plates in the glass plate laminated body. The glass plate baling body can bale a plurality of glass plates with high quality while suppressing the occurrence of damage, defects and the like. The glass plate laminate (10) has a plurality of protective sheet groups (S, S...) each interposed between a pair of adjacent glass plates (G), the protective sheet group (S) comprising a plurality of protective sheets (Sa, Sa) disposed in a state of overlapping each other, and a first static friction coefficient between the pair of protective sheets (Sa) overlapping each other is smaller than a second static friction coefficient between the glass plates (G) and the protective sheets (Sa).

Description

Technical Field

[0001] The present utility model relates to a glass plate package body including a glass plate laminate formed by laminating a plurality of glass plates and a tray for holding the glass plate laminate in a placed state. Background Art

[0002] Conventionally, a glass plate package body in a package form for transporting, storing, etc. by aggregating a plurality of glass plates has been known.

[0003] For example, as an example thereof, Patent Document 1 discloses a glass plate package body including a laminate (glass plate laminate) formed by laminating a plurality of glass plates and a tray for placing and holding the glass plate laminate in a vertically placed state.

[0004] In the above glass plate laminate, generally, a structure is formed in which a single protective sheet is interposed between a pair of adjacent glass plates to prevent damage, defects, etc. caused by contact between the glass plates.

[0005] Prior Art Documents

[0006] Patent Documents

[0007] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2021 - 46238 Summary of the Utility Model

[0008] Problems to be Solved by the Utility Model

[0009] In the above-mentioned conventional glass plate package body, regarding the material of the protective sheet, resin members such as resin sheets and foamed resin sheets or backing papers such as pulp papers are widely used. However, in recent years, the problems of depletion of petroleum resources and environmental pollution have been increasingly discussed. It is important to reduce the usage amount of resin members and increase the usage amount of environmentally friendly backing papers on the other hand.

[0010] However, the glass plate package body during transportation is always exposed to vibration, and generally, a protective sheet made of backing paper is likely to slide relative to a pair of glass plates in contact with itself due to the vibration. Therefore, for example, it may become an important factor for inducing damage, defects, etc. in the glass plate due to the presence of foreign matters such as glass powder between the protective sheet and the plate glass.

[0011] The present utility model has been completed in view of the above-described current problems, and an object thereof is to provide a glass plate package body including a glass plate laminate formed by laminating a plurality of glass plates and a tray for holding the glass plate laminate in a placed state, and a protective sheet is interposed between a pair of adjacent glass plates in the glass plate laminate, and the glass plate package body can package a plurality of glass plates with high quality while suppressing the occurrence of damage, defects, etc.

[0012] Solution to the problem

[0013] The problem to be solved by the present utility model is as described above. Next, the solution to solve this problem will be described.

[0014] That is, the glass plate package body of Solution 1 of the present utility model includes a glass plate laminate formed by laminating a plurality of glass plates and a tray for holding the glass plate laminate in a placed state. It is characterized in that the glass plate laminate has a plurality of protection sheet groups respectively sandwiched between a pair of adjacent glass plates, and each protection sheet group is composed of a plurality of protection sheets arranged in an overlapping state. The first static friction coefficient between a pair of overlapping protection sheets is smaller than the second static friction coefficient between the glass plate and the protection sheet.

[0015] In this way, in the glass plate package body of the present utility model, the following structure is formed: a sheet group composed of a plurality of protection sheets is respectively sandwiched between each pair of adjacent glass plates, and the first static friction coefficient between a pair of overlapping protection sheets is smaller than the second static friction coefficient between the glass plate and the protection sheet.

[0016] Therefore, according to the glass plate package body of the present utility model, even when exposed to vibrations during transportation, slippage between a plurality of protection sheets occurs immediately prior to slippage between the glass plate and the protection sheet. Therefore, even when there are foreign matters such as glass powder between the protection sheet and the sheet glass, damage, defects, etc. on the glass plate can be suppressed.

[0017] In addition, the glass plate package body of Solution 2 of the present utility model is based on Solution 1 above, and is characterized in that the first dynamic friction coefficient between a pair of overlapping protection sheets in the protection sheet group is smaller than the second dynamic friction coefficient between the glass plate and the protection sheet.

[0018] By having this structure, in the glass plate package body of the present utility model, even when slippage occurs between the glass plate and the protection sheet, the first dynamic friction coefficient between a pair of overlapping protection sheets is smaller than the second dynamic friction coefficient between the glass plate and the protection sheet. Therefore, even if slippage occurs between the glass plate and the protection sheet due to vibrations during transportation, the slippage between the glass plate and the protection sheet quickly subsides, and slippage between a plurality of protection sheets occurs immediately.

[0019] As a result, damage, defects, etc. on the glass plate can be more reliably suppressed.

[0020] In addition, the glass plate package body of Solution 3 of the present utility model is based on Solution 1 or 2 above, and is characterized in that each protection sheet group is composed of two protection sheets.

[0021] With such a structure, the glass plate package according to the present utility model can suppress damage, defects, etc. on the glass plates while minimizing the number of protective sheets, thereby improving the loading efficiency of the glass plates in the glass plate package.

[0022] In addition, the glass plate package of Solution 4 of the present utility model, in any one of the above Solutions 1 to 3, is characterized in that the protective sheet is made of lining paper.

[0023] The protective sheet made of resin components has a high burden on the environment and has a relatively thick thickness, so it may be an important factor that reduces the loading efficiency of the glass plates in the glass plate package.

[0024] In the glass plate package of the present utility model, a protective sheet made of lining paper is used. Thus, it will not induce the above-mentioned negative impacts on the environment and the reduction of the loading efficiency of the glass plates, etc., and can suppress damage, defects, etc. on the glass plates.

[0025] In addition, the glass plate package of Solution 5 of the present utility model, in any one of the above Solutions 1 to 4, is characterized in that the difference between the first static friction coefficient and the second static friction coefficient is 0.1 or more.

[0026] With such a structure, in the glass plate package according to the present utility model, the difference between the first static friction coefficient and the second static friction coefficient becomes clear, and slippage between multiple protective sheets can be more reliably generated prior to slippage between the glass plate and the protective sheet, suppressing damage, defects, etc. on the glass plates.

[0027] In addition, the glass plate package of Solution 6 of the present utility model, in any one of the above Solutions 1 to 5, is characterized in that the glass plates in the glass plate laminate are formed into rectangular flat plates, and the protective sheets are formed into rectangular sheets, and the protective sheets are arranged in a state of protruding from at least one end of the glass plates, and the protruding amount of the protective sheets protruding from one end of the glass plates is 3 mm or more and 100 mm or less.

[0028] With such a structure, in the glass plate package according to the present utility model, by arranging the protective sheets in a state of protruding from one end of the glass plates, the protective sheets can protect from the central part to one end of the main surface of the glass plates, and damage, defects, etc. on the glass plates can be more effectively suppressed.

[0029] In addition, the glass plate package of Solution 7 of the present utility model, in any one of the above Solutions 1 to 6, is characterized in that the multiple protective sheets constituting each protective sheet group are arranged in a state where the protruding amounts protruding from one end of the glass plates are different from each other.

[0030] With this structure, in the case of bundling the glass plate package according to the present utility model, each protective sheet can be easily grasped and processed when the protective sheet is arranged during the bundling of the glass plate package or when the protective sheet is taken out during the unbundling of the glass plate package.

[0031] In addition, the glass plate package of the eighth aspect of the present utility model includes a glass plate laminate formed by laminating a plurality of rectangular flat glass plates and a tray for holding the glass plate laminate in a placed state. It is characterized in that the glass plate laminate has a plurality of protective sheet groups respectively interposed between a pair of adjacent glass plates, the protective sheet group is composed of a plurality of rectangular sheet-like protective sheets arranged in an overlapping state, the protective sheets are arranged in a state of protruding from at least one end of the glass plate, and the protruding amount of the protective sheets protruding from one end of the glass plate is 3 mm or more and 100 mm or less.

[0032] With this structure, in the case of the glass plate package according to the present utility model, by arranging the protective sheets in a state of protruding from one end of the glass plate, it is possible to protect from the central portion to one end of the main surface of the glass plate by using the protective sheets, and it is possible to more effectively suppress damage, defects, etc. from occurring on the glass plate.

[0033] Utility Model Effects

[0034] As the effects of the present utility model, the following effects are achieved.

[0035] That is, in the case of the glass plate package according to the present utility model, it is possible to bundle a plurality of glass plates with high quality while suppressing the occurrence of damage, defects, etc. Description of the Drawings

[0036] Figure 1 It is a view showing the overall structure of a glass plate package according to an embodiment of the present utility model. Figure 1 (a) thereof is a side view. Figure 1 (b) thereof is a front view.

[0037] Figure 2 It is a view for explaining the structure of a glass plate package according to another embodiment of the present utility model, and is an enlarged side view showing the vicinity of the upper end of a glass plate laminate arranged on a tray.

[0038] Figure 3 It is a view for explaining the method of measuring the static friction coefficient and the dynamic friction coefficient. Figure 3 (a) thereof is a schematic view showing the method of measuring the static friction coefficient and the dynamic friction coefficient between two pieces of backing paper. Figure 3 (b) thereof is a schematic view showing the method of measuring the static friction coefficient and the dynamic friction coefficient between the backing paper and the glass plate.

[0039] Description of Reference Numerals

[0040] 1, 101 Glass plate bundle

[0041] 10, 110 Stacked glass plates

[0042] 20, 120 Pallet

[0043] G Glass plate

[0044] Ga Upper end (one end)

[0045] Gb Side end (one end)

[0046] S, S1 Protective sheet group

[0047] Sa, Sa1 Protective sheet Detailed implementation mode

[0048] Next, use Figures 1 to 3 to describe an embodiment of the present utility model

[0049] It should be noted that in Figure 1 (a), (b) and Figure 2 below, the front-back direction, left-right direction and up-down direction of the glass plate bundle 1, 101 are defined by the direction of the arrow for description

[0050] [Overall structure of the glass plate bundle 1]

[0051] First, use Figure 1 (a), (b) of below to describe the overall structure of the glass plate bundle 1 embodying the present utility model

[0052] The glass plate bundle 1 in this embodiment is an example of a bundled form for collecting a plurality of produced glass plates G, G... together for transportation, storage, etc

[0053] The glass plate bundle 1 mainly includes a stacked glass plate body 10 formed by stacking a plurality of glass plates G, G... and a pallet 20 for placing and holding the stacked glass plate body 10 in a vertically placed state

[0054] It should be noted that the structure of the pallet 20 is not limited to this embodiment. For example, it can also be a pallet for placing and holding the stacked glass plate body 10 in a horizontally placed state

[0055] Here, in the present embodiment, the glass plates G bundled by the glass plate bundle 1 are, for example, rectangular flat glass plates used in substrates and cover glass plates of displays such as liquid crystal display devices and organic EL display devices. The outer dimensions (longitudinal dimension × transverse dimension) are set to be 400 mm × 500 mm or more and 3000 mm × 3500 mm or less. In addition, the thickness is set to be 0.3 mm or more and 1.1 mm or less.

[0056] The glass plate laminate 10 includes the above-described plurality of glass plates G, G... and a plurality of protective sheet groups S, S...

[0057] In addition, each protective sheet group S is composed of a plurality of (two in the present embodiment) protective sheets Sa, Sa.

[0058] It should be noted that the number of the protective sheets Sa is not limited to two, and may be three or more.

[0059] However, as in the present embodiment, by forming the protective sheet group S with two protective sheets Sa, Sa, for example, as described later, damage, defects, etc. generated in the glass plate G can be suppressed, and the number of the protective sheets Sa is suppressed to the minimum, so that the loading efficiency of the glass plates G in the glass plate bundle 1 can be improved, and thus it is more preferable.

[0060] Each protective sheet Sa is formed of a rectangular sheet-like backing paper made of pulp paper. Its outer dimensions (longitudinal dimension × transverse dimension) are slightly larger than the outer dimensions of the glass plate G, and are set to be 430 mm × 600 mm or more and 3030 mm × 3600 mm or less. In addition, the thickness is set to be 50 μm or more and 1.1 mm or less.

[0061] It should be noted that the thickness of the protective sheet Sa in the present embodiment is about 80 μm.

[0062] Here, in the case where the protective sheet Sa is made of a resin member such as a foamed resin, it has appropriate cushioning properties. Therefore, for example, even when there are foreign matters such as glass powder between the protective sheet Sa and the glass plate G, the foreign matter is easily buried in the protective sheet Sa, and damage, defects, etc. generated in the glass plate G can be effectively suppressed.

[0063] However, since the protective sheet Sa made of a resin member has a high burden on the environment and has a relatively thick thickness, it may be an important factor that reduces the loading efficiency of the glass plates G in the glass plate bundle 1.

[0064] In the glass plate bundle 1 of the present embodiment, a protective sheet Sa made of wrapping paper is used. As a result, it is possible to suppress the occurrence of negative environmental impacts and a decrease in the loading efficiency of the glass plate G as described above, and it is possible to suppress damage, defects, etc. from occurring in the glass plate G as described later.

[0065] A plurality of glass plates G, G... are sequentially placed on the placement table 21 of the tray 20 described later in a vertically placed state and stacked while being tilted toward the back support member 22.

[0066] In addition, a plurality of protective sheet groups S, S... are arranged in a state where two protective sheets Sa, Sa are overlapped (coincided) with each other and are respectively interposed between a pair of adjacent glass plates G, G.

[0067] Thus, a glass plate laminate 10 is constructed.

[0068] Here, in the glass plate laminate 10, the two protective sheets Sa, Sa constituting each protective sheet group S are respectively arranged in a state of protruding from at least one end portion (the upper end portion Ga and the left and right side end portions Gb, Gb in the present embodiment) of each glass plate G.

[0069] Moreover, the protruding amount d1 of each protective sheet Sa protruding from the upper end portion Ga of the glass plate G and the protruding amount d2 protruding from the side end portion Gb are both set to be 3 mm or more and 100 mm or less.

[0070] With this structure, in the glass plate bundle 1 of the present embodiment, by arranging the protective sheet Sa in a state of protruding from one end portion (the upper end portion Ga or the side end portion Gb) of the glass plate G, it is possible to protect the glass plate G from the central portion to one end portion of the main surface by the protective sheet Sa, and it is possible to more effectively suppress damage, defects, etc. from occurring in the glass plate G.

[0071] The tray 20 has: a placement table 21 that supports the lower end portion of the glass plate G; a back support member 22 that supports the back surface (the rear surface in Figure 1 this case) of the glass plate G; and a support frame 23 that supports the placement table 21 and the back support member 22.

[0072] The placement table 21 is composed of a substantially rectangular plate-shaped member extending in the horizontal direction and in one direction (the left-right direction in Figure 1 this case), and is arranged in a state where the upper surface 21a is slightly inclined forward and upward.

[0073] Moreover, the glass plate G is placed on the upper surface 21a of the placement table 21 in a vertically placed state.

[0074] The back support member 22 is composed of a rectangular flat plate-shaped member and is erected at one end portion of the placement table 21 (inFigure 1 The middle is the rear end part).

[0075] That is, the surface 22a on the mounting table 21 side (the front side in Figure 1 is set in a state of standing up in a substantially right-angled direction with respect to the upper surface 21a of the mounting table 21.

[0076] And, the glass plate G placed on the upper surface 21a of the mounting table 21 in a vertically placed posture is supported on the back surface (rear surface) by the surface 22a of the back support member 22, so as to be held in a state of being slightly tilted (inclined) toward the back support member 22 side (the rear side in Figure 1 is).

[0077] The support frame 23 has, for example: a base frame 23a having a rectangular shape in plan view, which extends along the mounting table 21; a plurality of support blocks 23b, 23b..., which support the mounting table 21 along one end (the front end in Figure 1 is) on the upper surface of the base frame 23a; a plurality of columns 23c, 23c..., which are erected in parallel along the other end (the rear end in Figure 1 is) on the upper surface of the base frame 23a; a back frame 23d, which is provided along the inner surface 22b on the opposite side (the rear side in Figure 1 is) of the surface 22a side of the back support member 22 and is composed of a lattice structure; and a plurality of beam members 23e, 23e..., which connect the columns 23c and the back frame 23d.

[0078] And, a plurality of openings 23a1, 23a1... for inserting the claws for transportation of a forklift are provided on the side surface of the base frame 23a.

[0079] In addition, in the above glass plate laminate 10, the static friction coefficient between the respective protective sheets Sa is preferably 0.4 or more and 0.8 or less, more preferably 0.5 or more and 0.75 or less, and still more preferably 0.6 or more and 0.7 or less, between two protective sheets Sa, Sa.

[0080] In addition, the static friction coefficient between the protective sheet Sa and the glass plate G is preferably 0.8 or more and 1.2 or less, more preferably 0.9 or more and 1.15 or less, and still more preferably 1.0 or more and 1.1 or less.

[0081] And, in the present embodiment, the static friction coefficient between two protective sheets Sa, Sa is set to about 0.6.

[0082] In addition, the static friction coefficient between the protective sheet Sa and the glass plate G is set to about 1.0.

[0083] Thus, the glass plate bundle 1 in the present embodiment includes a glass plate laminate 10 formed by laminating a plurality of glass plates G, G... and a tray 20 that holds the glass plate laminate 10 in a placed state. The glass plate laminate 10 has a plurality of protection sheet groups S, S... respectively interposed between a pair of adjacent glass plates G, G.

[0084] Moreover, each protection sheet group S is composed of a plurality of (two in the present embodiment) protection sheets Sa, Sa arranged in a mutually overlapping (coinciding) state. The first static friction coefficient Fa1 between the pair of mutually overlapping protection sheets Sa, Sa is preset to be smaller than the second static friction coefficient Fa2 between the glass plate G and the protection sheet Sa (Fa1 < Fa2).

[0085] With such a structure, according to the glass plate bundle 1 in the present embodiment, even when exposed to vibrations during transportation, slippage immediately occurs between the plurality of (two) protection sheets Sa, Sa prior to slippage between the glass plate G and the protection sheet Sa. For example, even when there are foreign substances such as glass powder between the protection sheet Sa and the glass plate G, damage, defects, etc. to the glass plate G can be suppressed.

[0086] In addition, in the relationship between the first static friction coefficient Fa1 between the pair of protection sheets Sa, Sa in the glass plate laminate 10 and the second static friction coefficient Fa2 between the glass plate G and the protection sheet Sa, the difference between the first static friction coefficient Fa1 and the second static friction coefficient Fa2 is set to be 0.1 or more ((Fa2 - Fa1) > 0.1).

[0087] With such a structure, according to the glass plate bundle 1 in the present embodiment, the difference between the first static friction coefficient Fa1 and the second static friction coefficient Fa2 becomes clear, and slippage between the plurality of protection sheets Sa, Sa can be more reliably generated prior to slippage between the glass plate G and the protection sheet Sa, suppressing damage, defects, etc. to the glass plate G.

[0088] Furthermore, in the above-mentioned glass plate laminate 10, the dynamic friction coefficient of each protection sheet Sa is preferably 0.4 or more and 0.8 or less, more preferably 0.45 or more and 0.7 or less, and still more preferably 0.5 or more and 0.6 or less, between the two protection sheets Sa, Sa.

[0089] In addition, the dynamic friction coefficient of each protection sheet Sa is preferably 0.8 or more and 1.2 or less, more preferably 0.85 or more and 1.1 or less, and still more preferably 0.9 or more and 1.0 or less, between the protection sheet Sa and the glass plate G.

[0090] Moreover, in the present embodiment, the dynamic friction coefficient between the two protection sheets Sa, Sa is set to be about 0.5.

[0091] In addition, the dynamic friction coefficient between the protective sheet Sa and the glass plate G is set to be about 0.9.

[0092] Thus, in the glass plate bundle 1 of the present embodiment, the first dynamic friction coefficient Fb1 between a pair of protective sheets Sa, Sa that overlap each other is preset to be smaller than the second dynamic friction coefficient Fb2 between the glass plate G and the protective sheet Sa (Fb1 < Fb2).

[0093] With this structure, in the glass plate bundle 1 of the present embodiment, even when slippage occurs between the glass plate G and the protective sheet Sa, the structure is such that the first dynamic friction coefficient Fb1 between a pair of protective sheets Sa, Sa that overlap each other is smaller than the second dynamic friction coefficient Fb2 between the glass plate G and the protective sheet Sa. Therefore, even if slippage occurs between the glass plate and the protective sheet due to vibration during transportation, for example, the slippage between the glass plate G and the protective sheet Sa quickly subsides, and slippage immediately occurs between multiple (two) protective sheets Sa, Sa.

[0094] As a result, damage, defects, etc. to the glass plate G can be more reliably suppressed.

[0095] [Structure of the glass plate bundle 101 (another embodiment)]

[0096] Next, Figure 2 the structure of the glass plate bundle 101 in another embodiment of the present utility model will be described.

[0097] The glass plate bundle 101 in another embodiment has a structure substantially equivalent to that of the glass plate bundle 1 in the foregoing present embodiment. On the other hand, regarding the arrangement state of the protective sheet group S1 in the glass plate laminate 110, it is different from that of the glass plate bundle 1.

[0098] Therefore, in the following description, mainly the differences from the glass plate bundle 1 in the present embodiment will be described, and the description of the structure equivalent to that of the glass plate bundle 1 will be omitted.

[0099] The glass plate bundle 101 mainly includes a glass plate laminate 110 formed by laminating a plurality of glass plates G, G... and a tray 120 that mounts and holds the glass plate laminate 110 in a vertically placed state.

[0100] It should be noted that the tray 120 has the same structure as the tray 20 in the present embodiment, so the description thereof will be omitted.

[0101] The glass plate laminate 110 has the above-mentioned plurality of glass plates G, G... and a plurality of protective sheet groups S1, S1...

[0102] In addition, each protective sheet group S1 is composed of a plurality of (two in this embodiment) protective sheets Sa1 and Sa1.

[0103] It should be noted that the protective sheet group S1 and the protective sheet Sa1 have the same structure as the protective sheet group S and the protective sheet Sa in this embodiment, respectively. Therefore, the description thereof is omitted.

[0104] A plurality of glass plates G, G... are sequentially placed on the placement table (not shown) of the tray 120 in a vertically placed state and stacked while being tilted toward the back support member 122.

[0105] In addition, a plurality of protective sheet groups S1, S1... are arranged in a state where two protective sheets Sa1 and Sa1 overlap (coincide) with each other and are respectively sandwiched between a pair of adjacent glass plates G and G.

[0106] Thus, a glass plate laminate 110 is constructed.

[0107] Here, in the glass plate laminate 110, the two protective sheets Sa1 and Sa1 constituting each protective sheet group S1 are respectively arranged in a state of protruding from at least one end portion (the upper end portion Ga in this embodiment) of each glass plate G.

[0108] Moreover, the two protective sheets Sa1 and Sa1 constituting each protective sheet group S1 are arranged in a state where the protruding amounts from the upper end portion (one end portion) of the glass plate G are different from each other.

[0109] Specifically, in each protective sheet group S1, for example, the protective sheet Sa1 ( Figure 2 the protective sheet Sx therein) located on the side of the back support member 122 (the rear side in this other embodiment) is set such that the protruding amount X from the upper end portion is larger than the protruding amount Y of the protective sheet Sa1 ( Figure 2 the protective sheet Sy therein) located on the side opposite to the side of the back support member 122 (the front side in this other embodiment) from the upper end portion (X > Y).

[0110] With this structure, according to the glass plate bundle 101 in this other embodiment, when the protective sheet Sa1 is arranged during the bundling of the glass plate bundle 101 or when the protective sheet Sa1 is taken out during the unbundling of the glass plate bundle 101, by grasping the portion where the protective sheet Sx protrudes from the protective sheet Sy, each protective sheet Sa1 can be easily grasped for processing.

[0111] [Method for Measuring Friction Coefficient and Measurement Results]

[0112] Next, regarding the method for measuring and the measurement results of the coefficient of friction (static coefficient of friction and dynamic coefficient of friction) of the protective sheet Sa (Sa1) used in the glass plate bundle 1 (or the glass plate bundle 101 in another embodiment), use Figure 3 to explain.

[0113] First of all, initially, as Measurement Experiment 1, the static coefficient of friction and the dynamic coefficient of friction between two protective sheets Sa and Sa were measured 5 times each.

[0114] Regarding the measurement method, it was carried out in the following order.

[0115] That is, as shown in (a) of Figure 3 , after placing two overlapping (coincident) protective sheets Sa and Sa on a specified platform 201, weights 202 were further placed on these two protective sheets Sa and Sa.

[0116] Next, the upper protective sheet Sa was connected to a pre-prepared force sensor 204 using a traction member 203 such as a wire.

[0117] And, using the traction member 203, the upper protective sheet Sa was pulled in the horizontal direction. After measuring the load F1a when changing from the stationary state to the moving state and the load F1b in the moving state using the force sensor 204, based on the following Mathematical Formulas 1 and 2, the static coefficient of friction K1a and the dynamic coefficient of friction K1b were calculated respectively.

[0118] K1a = F1a / M (Mathematical Formula 1)

[0119] K1b = F1b / M (Mathematical Formula 2)

[0120] (It should be noted that M is the sum of the loads of the weight 202 and one protective sheet Sa)

[0121] Here, the protective sheet Sa to be measured was made of pulp paper with a density of 2.52 g / cm 3 and a protective sheet with an outer dimension of 63 mm × 63 mm.

[0122] In addition, regarding the load of the weight 202, a 200 g weight was used.

[0123] Moreover, regarding the environmental conditions during measurement, the temperature was 23.4 °C and the humidity was 61%.

[0124] Next, as Measurement Experiment 2, the static coefficient of friction and the dynamic coefficient of friction between the protective sheet Sa and the glass plate G were measured 5 times each.

[0125] Regarding the measurement method, it was carried out in the following order.

[0126] That is, as shown in (b) of Figure 3 After placing the protective sheets Sa and the glass plate G that overlap (coincide) with each other on the specified platform 201, weights 202 are further placed on these protective sheets Sa and the glass plate G.

[0127] Next, the upper protective sheet Sa is connected to a pre-prepared force sensor 204 using a traction member 203 such as a wire.

[0128] Then, the upper protective sheet Sa is pulled horizontally using the traction member 203. After respectively measuring the load F2a when changing from the stationary state to the moving state and the load F2b in the moving state using the force sensor 204, the static friction coefficient K2a and the dynamic friction coefficient K2b are respectively calculated based on the following mathematical formulas 3 and 4.

[0129] K2a = F2a / M (Mathematical formula 3)

[0130] K2b = F2b / M (Mathematical formula 4)

[0131] (It should be noted that M is the sum of the loads of the weight 202 and one protective sheet Sa)

[0132] Here, the protective sheet Sa to be the measurement object is the same as the protective sheet in the above-mentioned measurement experiment 1.

[0133] In addition, the glass plate G is a glass plate manufactured by Nippon Electric Glass Co., Ltd. (product name: OA - 11), and a glass plate with an outer dimension of 63 mm × 63 mm is used.

[0134] Moreover, regarding the environmental conditions during the measurement, it is the same as in the above-mentioned measurement experiment 1, with an air temperature of 23.4 °C and a humidity of 61%.

[0135] The results of the above-mentioned measurement experiment 1 and measurement experiment 2 are shown in Table 1 below.

[0136] Table 1

[0137]

[0138] As shown in Table 1, in measurement experiment 1, the static friction coefficient K1a between the two protective sheets Sa, Sa is 0.60 - 0.67, and the average value is 0.64.

[0139] In addition, the dynamic friction coefficient K1b between the two protective sheets Sa, Sa is 0.52 - 0.57, and the average value is 0.55.

[0140] On the other hand, in measurement experiment 2, the static friction coefficient K2a between the protective sheet Sa and the glass plate G was 0.84 to 1.21, and the average value thereof was 1.08.

[0141] In addition, the dynamic friction coefficient K2b between the protective sheet Sa and the glass plate G was 0.78 to 1.07, and the average value thereof was 0.96.

[0142] As described above, an embodiment embodying the present utility model has been described, but the present utility model is not limited to such an embodiment, and is merely illustrative. Of course, within the scope not departing from the gist of the present utility model, it can be implemented in various ways. The scope of the present utility model is represented by the description of the patent technical solution, and also includes the equivalent meaning described in the patent technical solution and all changes within the scope.

[0143] In the above embodiment, the glass plate G is loaded on the back support portion 22, but it is not limited thereto. A protective sheet S may be interposed between the back support portion 22 and the glass plate G. The protective sheet S interposed between the back support portion 22 and the glass plate G may be one sheet, or two or more sheets.

Claims

1. A glass plate bundle, comprising a glass plate laminate formed by laminating a plurality of glass plates and a tray for holding the glass plate laminate in a placed state. It is characterized in that the glass plate laminate has a plurality of protection sheet groups respectively interposed between a pair of adjacent glass plates, each protection sheet group is composed of a plurality of protection sheets arranged in an overlapping state, the first static friction coefficient between a pair of the protection sheets arranged in an overlapping state is smaller than the second static friction coefficient between the glass plate and the protection sheet.

2. The glass plate bundle according to claim 1, characterized in that in the protection sheet group, the first dynamic friction coefficient between a pair of the protection sheets arranged in an overlapping state is smaller than the second dynamic friction coefficient between the glass plate and the protection sheet.

3. The glass plate bundle according to claim 1 or 2, characterized in that each of the protection sheet groups is composed of two of the protection sheets.

4. The glass plate bundle according to claim 1 or 2, characterized in that the protection sheet is composed of tissue paper.

5. The glass plate bundle according to claim 1 or 2, characterized in that the difference between the first static friction coefficient and the second static friction coefficient is 0.1 or more.

6. The glass plate bundle according to claim 1 or 2, characterized in that in the glass plate laminate, the glass plates are formed in a rectangular flat plate shape, and the protection sheets are formed in a rectangular sheet shape, the protection sheets are arranged in a state of protruding from at least one end portion of the glass plate, the protruding amount of the protection sheet protruding from one end portion of the glass plate is 3 mm or more and 100 mm or less.

7. The glass plate bundle according to claim 6, characterized in that the plurality of protection sheets constituting each of the protection sheet groups are arranged in a state where the protruding amounts protruding from one end portion of the glass plate are different from each other.

8. A glass plate bundle, comprising a glass plate laminate formed by laminating a plurality of rectangular flat plate-shaped glass plates and a tray for holding the glass plate laminate in a placed state. It is characterized in that the glass plate laminate has a plurality of protection sheet groups respectively interposed between a pair of adjacent glass plates, each protection sheet group is composed of a plurality of rectangular sheet-shaped protection sheets arranged in an overlapping state, the protection sheets are arranged in a state of protruding from at least one end portion of the glass plate, the protruding amount of the protection sheet protruding from one end portion of the glass plate is 3 mm or more and 100 mm or less.

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