JP6711403B2 - Glass plate pallet and glass plate package - Google Patents

Description

TECHNICAL FIELD The present invention relates to a glass plate pallet and a glass plate package using the same.

As is well known, glass plates used in various fields such as glass substrates for flat panel displays (FPD) such as liquid crystal displays, plasma displays, and organic EL displays, and cover glasses for organic EL lighting. In fact, in recent years, there is a demand for larger size and thinner wall thickness. Therefore, the glass plate is likely to be damaged, and the packaging form of the glass plate during storage and transportation is extremely important.

As a packing form of this type of glass plate, a method of packing a plurality of glass plates in a pallet in a state of a laminated body in which they are stacked flat (stacked in a flat state) is known (for example, Patent Documents 1 to 2). See). In this packaging form, the weight of the glass plate is mainly supported by the main surface of the glass plate (surfaces facing each other in the thickness direction), so that unnecessary stress is less likely to concentrate on the side of the glass plate that is easily damaged. There is.

Here, a pallet for packing a laminated body in which a plurality of glass plates are stacked flat is provided with a base portion placed on a floor surface or the like. From the viewpoint of weight reduction and the like, the base portion is made of a lattice-shaped frame made of a metal such as an aluminum alloy, and a plurality of holes are often formed in the portion corresponding to the support region of the laminate. In addition, a single buffer plate is generally laid on the upper surface of the base portion so as to close the hole (see, for example, FIG. 4 of Patent Document 2). In this case, the buffer plate serves as a main surface support portion that supports the main surface (lower surface) of the glass plates included in the laminated body from below.

In addition, as a packaging form of glass plates, it is also known to package a plurality of glass plates in a pallet in a stacked state in a vertical posture (for example, Patent Documents 3 to 4). In this packaging form, since the glass plates are stacked in a vertical posture, there is an advantage that space efficiency during transportation is good.

Here, a pallet for packing a laminated body in which a plurality of glass plates are laminated in a vertical posture has a base part placed on a floor surface and a back receiving part standing up from the rear side of the base part. In addition, a laminated body formed by laminating a plurality of glass plates in a vertical posture is arranged above the base portion and in front of the back receiving portion. From the viewpoint of weight reduction and the like, the back receiving portion is made of a lattice-shaped frame made of a metal such as an aluminum alloy, and a plurality of holes are often formed in the portion corresponding to the support region of the laminate. Further, it is general that one cushion plate is laid on the front surface of the back receiving portion so as to close the hole. In this case, the buffer plate serves as a main surface supporting portion that supports the main surface of the glass plate included in the laminated body from the rear side.

JP, 2010-143599, A JP, 2010-168046, A JP, 2008-143539, A JP, 2008-143541, A

However, in a pallet for packing a laminated body in which a plurality of glass plates are stacked flat, if the plurality of holes in the base are closed with only one large buffer plate, the glass plate becomes large and thin. As a result, the following problems may occur.

First, as the size of the glass plate increases, the load supported by the buffer plate as the main surface supporting portion increases, and it becomes difficult to secure sufficient rigidity only with the buffer plate. As a result, the buffer plate may bend at a position corresponding to the hole in the base. In this case, since the glass plate itself is likely to be deformed as the plate becomes thinner, the glass plate included in the laminated body may be deformed following the bending of the buffer plate. In particular, the glass plate is likely to be greatly deformed in the lower part of the laminated body, which may cause the glass plate to be damaged.

Secondly, since the buffer plate as the main surface supporting portion is a single continuous plate material, when vibration is applied to a part of the buffer plate by an impact from below, the vibration is easily propagated to the entire buffer plate. .. As a result, there is a risk that the glass plates included in the laminate may be displaced or the glass plates may be damaged. Here, it is possible to use a shock absorbing plate having a high vibration absorbing performance, but such a shock absorbing plate generally has low rigidity. Therefore, even if the problem of vibration can be solved, the problem of the above-mentioned bending is rather serious.

Such a problem is that in a pallet for packing a laminated body in which a plurality of glass plates are laminated in a vertical posture, a plurality of holes in the back receiving part are closed by a main surface supporting part made of one large buffer plate. In the case of, it may occur similarly.

The present invention has a technical object to secure the rigidity of a main surface support portion that supports the main surface of a laminate, and to make it difficult for vibration applied to the main surface support portion to propagate to a glass plate included in the laminate. ..

A glass plate pallet according to the present invention, which was devised to solve the above-mentioned problems, is for packing a laminate formed by flatly stacking a plurality of glass plates, and has a plurality of holes formed therein. It has a base part composed of a lattice-like frame and a main surface support part provided on the upper surface of the base part and supporting the main surface of the glass plate of the laminated body from below, and the main surface support part closes the hole. Thus, it has a laminated structure including a rigid plate laid on the upper surface of the base part and a buffer plate laid on the upper surface of the rigid plate, and the rigid plate is divided into a plurality of small plates in the plane direction. It is characterized by According to this structure, the main surface support portion that supports the main surface (lower surface) of the glass plate of the laminated body has a laminated structure in which the buffer plate is reinforced by the rigid plate, so that the rigidity of the main surface support portion is increased. Be done. Further, since the rigid plate is divided into a plurality of small plates in the plane direction, even if a part of the rigid plate is vibrated by an external impact or the like, the vibration is weakened at the divided parts. Therefore, it becomes difficult for vibration to propagate to the laminated body supported by the main surface supporting portion including such a rigid plate.

In the above structure, it is preferable that the buffer plate is divided into a plurality of small plates in the plane direction. With this configuration, the vibration applied to the main surface support portion is less likely to propagate through the laminated body.

In the above structure, the rigid plate and the buffer plate may be separably screwed to the base portion. By doing so, it becomes possible to easily fix the rigid plate and the cushioning plate to the base part and to easily remove them from the base part. Therefore, it becomes easy to replace the rigid plate and the buffer plate.

In the above structure, it is preferable that the skeleton of the base portion is provided along the peripheral edge of each of the small plates of the rigid plate. In this way, the peripheral edge of each small plate of the rigid plates is supported by the frame of the base. Therefore, even if the rigid plate is made thin, the rigidity of the main surface support portion can be easily ensured.

In the above structure, the buffer plate may have a laminated structure including a layer made of foamed resin. By doing so, it becomes possible to impart appropriate elasticity to the cushioning plate and enhance shock absorption.

A glass plate packaging body according to the present invention, which was conceived to solve the above-mentioned problems, is a glass plate pallet for packaging a laminated body having a plurality of glass sheets stacked flat, which is provided with the above configuration as appropriate. In the part including the main surface supporting portion, a laminated body formed by alternately stacking glass plates and protective sheets is supported. According to such a configuration, while ensuring the rigidity of the main surface supporting portion, it becomes difficult for the vibration applied to the main surface supporting portion to propagate to the glass plate included in the laminated body, so that the glass plate is displaced or damaged. It is possible to prevent the situation.

In the above structure, the thickness of the glass plate is T [mm], the thickness of each layer constituting the laminated structure of the principal surface supporting portion is D ₁ , D ₂ ... D _n [mm], the elastic modulus of each layer is E ₁ , If the E ₂ ... was E _n [GPa],
It is preferable that the relation

Here, if the main surface support portion bends at a position corresponding to the hole in the base portion, a problem may occur even if the glass plate is not damaged. That is, even if the bending of the main surface support portion is small enough not to damage the glass plate, when the glass plate is thin, the glass plate is slightly deformed following the shape of the main surface support portion. Then, the load of the glass plate is likely to be concentrated on the position corresponding to the frame of the base portion. As a result, foreign matter contained in the protective sheet or the like may be transferred to the glass plate at a position corresponding to the frame of the base.

Therefore, from the viewpoint of preventing the transfer of foreign matter, as a result of intensive research to optimize the thickness of the glass plate and the rigidity of the main surface supporting portion of the base portion, the relational expression as shown in Expression 1 is derived. Came to. That is, it is considered that the rigidity (bending rigidity) of the principal surface support portion is proportional to the elastic modulus of the principal surface support portion and proportional to the cube of the thickness of the principal surface support portion. Therefore, when the foreign material transfer of the glass plate was evaluated based on the value represented by the left side of Formula 1 (hereinafter, referred to as rigidity-related value) and the thickness of the glass plate, when the relationship of Formula 1 was satisfied, We have come to the conclusion that the transfer of foreign matter can be reduced to a level where there is no practical problem.

In this case, the total thickness of the main surface support portion is preferably 20 mm or less. Further, the thickness of the glass plate is preferably 0.5 mm or less.

The glass plate pallet according to the present invention, which was conceived to solve the above problems, is for packing a laminate formed by stacking a plurality of glass plates in a vertical posture, and a base part, A back support part which is made up of a lattice-shaped frame in which a plurality of holes are formed and which stands up from the rear side of the base part, and a main part which is provided on the front surface of the back support part and which supports the main surface of the glass plate of the laminated body from the rear side. The main surface support portion includes a surface support portion and a side support portion that is provided to engage with the base portion and/or the back support portion and supports the side of the glass plate of the laminated body from below, so that the main surface support portion closes the hole. Has a laminated structure including a rigid plate laid on the front surface of the back receiving portion and a cushioning plate laid on the front surface of the rigid plate, and the rigid plate is divided into a plurality of small plates in the plane direction. Is characterized by. With such a configuration, the main surface support portion that supports the main surface (back surface) of the glass plate of the laminated body has a laminated structure in which the buffer plate is reinforced by the rigid plate, so that the rigidity of the main surface support portion is increased. Be done. Further, since the rigid plate is divided into a plurality of small plates in the plane direction, even if a part of the rigid plate is vibrated by an external impact or the like, the vibration is weakened at the divided parts. Therefore, it becomes difficult for vibration to propagate to the laminated body supported by the main surface supporting portion including such a rigid plate.

In the above structure, it is preferable that the buffer plate is divided into a plurality of small plates in the plane direction. With this configuration, the vibration applied to the main surface support portion is less likely to propagate through the laminated body.

In the above structure, the rigid plate and the buffer plate may be separably screwed to the back receiving portion. With this configuration, the rigid plate and the cushioning plate can be easily fixed to the back receiving portion, or these can be easily removed from the back receiving portion. Therefore, it becomes easy to replace the rigid plate and the buffer plate.

In the above structure, it is preferable that the frame of the back receiving portion is provided along the peripheral edge of each small plate of the rigid plate. With this configuration, the peripheral edge of each small plate of the rigid plates is supported by the skeleton of the back receiving portion. Therefore, even if the rigid plate is made thin, the rigidity of the main surface support portion can be easily ensured.

In the above structure, the buffer plate may have a laminated structure including a layer made of foamed resin. By doing so, it becomes possible to impart appropriate elasticity to the cushioning plate and enhance shock absorption.

A glass plate packaging body according to the present invention, which was conceived to solve the above-mentioned problems, is a glass plate for packaging a laminated body, which is provided with the above-described configuration, and is formed by laminating a plurality of glass plates in a vertical posture. In the portion including the main surface supporting portion and the side supporting portion of the pallet for use, a laminated body formed by alternately laminating glass plates and protective sheets in a vertical posture is supported. According to such a configuration, while ensuring the rigidity of the main surface supporting portion, it becomes difficult for the vibration applied to the main surface supporting portion to propagate to the glass plate included in the laminated body, so that the glass plate is displaced or damaged. It is possible to prevent the situation.

In the above configuration, the angle formed between the front surface of the main surface support portion and the vertical surface is 13 to 23°, the thickness of the glass plate is T [mm], and each layer constituting the laminated structure of the main surface support portion is thickness when _{D 1, D 2 ... D n} [mm], the elastic modulus of each layer E _1, E ₂ ... and E _n [GPa],
It is preferable that the relation By doing so, the transfer of foreign matter to the glass plate can be reduced to a level at which there is no practical problem.

As described above, according to the present invention, while ensuring the rigidity of the main surface supporting portion that supports the main surface of the glass plate of the laminated body, the vibration applied to the main surface supporting portion propagates to the glass plate included in the laminated body. Can be hardened.

It is a perspective view which shows the glass plate package which concerns on 1st embodiment of this invention. It is a perspective view for demonstrating the principal part of the glass plate pallet used for the glass plate package of FIG. It is a perspective view for demonstrating the principal part of the glass plate pallet used for the glass plate package of FIG. It is a perspective view for demonstrating the principal part of the glass plate pallet used for the glass plate package of FIG. It is a top view for demonstrating the principal part of the glass plate pallet used for the glass plate package of FIG. FIG. 6 is a sectional view taken along line AA of FIG. 5. It is a perspective view for demonstrating the principal part of the glass plate pallet used for the glass plate package of FIG. It is a top view for demonstrating the principal part of the glass plate pallet used for the glass plate package of FIG. It is a top view which shows an example of the glass plate to which the foreign material was transferred. 6 is a graph showing the inspection result of transferred foreign matters. It is a perspective view which shows the glass plate package which concerns on 2nd embodiment of this invention. It is a perspective view for demonstrating the principal part of the glass plate pallet used for the glass plate package of FIG. It is a perspective view for demonstrating the principal part of the glass plate pallet used for the glass plate package of FIG. It is a perspective view for demonstrating the principal part of the glass plate pallet used for the glass plate package of FIG. It is a front view for demonstrating the principal part of the glass plate pallet used for the glass plate package of FIG. FIG. 16 is a sectional view taken along line BB of FIG. 15. It is a perspective view for demonstrating the principal part of the glass plate pallet used for the glass plate package of FIG. It is a front view for demonstrating the principal part of the glass plate pallet used for the glass plate package of FIG. 6 is a graph showing the inspection result of transferred foreign matters.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

(First embodiment)
As shown in FIG. 1, a glass plate package 1 according to a first embodiment of the present invention is a glass plate pallet (hereinafter, simply referred to as a pallet) 2 in which glass plates 3 and protective sheets 4 are alternately stacked flat. The laminated body 5 is supported. In this embodiment, the protective sheet 4 is arranged on the lowermost surface and the uppermost surface of the laminated body 5. The X1 direction and the Y1 direction in the drawing are directions orthogonal to each other.

The glass plate 3 preferably has a thickness of 0.2 to 1.8 mm, more preferably 0.2 to 0.5 mm. The glass plate 3 has a rectangular shape, and the length of one side thereof is preferably G5 size (1100 to 1300 mm) or more, and more preferably G8.5 size (2200 to 2500 mm) or more. The density of the glass plate 3 is preferably 2.0 to 3.0 g/cm ³ . As the glass plate 3, for example, a glass substrate for FPD such as a liquid crystal display is suitable.

The thickness of the protective sheet 4 is preferably 0.05 to 0.2 mm, more preferably 0.05 to 0.1 mm. The protective sheet 4 has a rectangular shape, and the length of one side is preferably G5 size (1100 to 1300 mm) or more, and more preferably G8.5 size (2200 to 2500 mm) or more. It is preferable that the protective sheet 4 is larger than the glass plates 3 in a plan view, and protrudes outward from each side of the glass plates 3 while being interposed between the glass plates 3. As the protective sheet 4, for example, a foamed resin sheet may be used, but in this embodiment, paper (interleaving paper) is used.

The pallet 2 includes a base portion 6 placed on the floor or the like. In this embodiment, the base portion 6 includes a lower step portion 7 and an upper step portion 8 integrally fixed to the lower step portion 7 by welding or the like. The lower step portion 7 and the upper step portion 8 each have a rectangular shape in a plan view. The upper step portion 8 is smaller than the lower step portion 7, and a part of the upper surface 7u of the lower step portion 7 is exposed. The base portion 6 is not limited to such a multi-stepped shape, and may have a shape including only one step.

At four corners of the exposed portion of the upper surface 7u of the lower step portion 7, pillars 9 that support the upper glass plate package 1 when the glass sheet packages 1 are stacked in a plurality of steps are detachably provided. The pillar 9 may be omitted.

Each of the four side surfaces 7s of the lower step portion 7 is provided with a fork hole 10 into which a fork of a forklift is inserted.

A main surface supporting portion (lower surface supporting portion) 11 that supports the lower surface 5b (main surface of the glass plate 3) of the laminated body 5 from below is provided on the upper surface 8u of the upper step portion 8. The main surface support portion 11 has a laminated structure in which a rigid plate 12 arranged on the base portion 6 side (lower side) and a buffer plate 13 arranged on the laminated body 5 side (upper side) are laminated. .. In this embodiment, the buffer plate 13 has a multilayer structure in which a first buffer plate 14 and a second buffer plate 15 are laminated. Here, if the total thickness of the main surface support portion 11 is increased, the loading space of the glass plate 3 is reduced and the loading efficiency of the glass plate 3 is reduced, so the total thickness of the main surface support portion 11 is 20 mm or less. Preferably.

On the four side surfaces 8s of the upper step portion 8, the lower end portions of the plurality of side surface pressing plates 16 are detachably attached by using fasteners such as screws in order to restrict the horizontal movement of the stacked body 5. In this embodiment, two side surface pressing plates 16 are attached to each side surface 8s of the upper step portion 8, that is, a total of eight side surface pressing plates 16 are attached. It is preferable that the side surface pressing plate 16 is in contact with the edge of the protective sheet 4 that protrudes around the glass plate 3. In other words, it is preferable that the side pressing plate 16 does not directly contact the glass plate 3. The side pressing plate 16 may be omitted.

An upper surface pressing plate (not shown) is arranged on the upper surface 5u (upper surface of the protection sheet 4 located in the uppermost surface in this embodiment) of the laminated body 5 in the state of the glass plate package 1, and the upper surface pressing plate is used as a belt or the like. The laminated body 5 is held on the main surface support portion 11 by pressing it against the base portion 6 with the fastener. As disclosed in, for example, Japanese Unexamined Patent Application Publication No. 2009-202900, a plurality of presser bars are arranged in parallel on the upper surface of the upper presser plate, and both end portions of each presser bar protruding from the laminated body 5 are attached to each other. The structure may be such that a fastening member (belt or rod-shaped or pipe-shaped rod-shaped body capable of fixing the pressing bar at a predetermined position in the longitudinal direction) is pressed to the base portion 6 side. As the upper surface pressing plate, for example, a cushioning plate such as a foamed resin sheet which is thicker and has higher hardness than the protective sheet 4 is used. In addition, in order to prevent dust from adhering to the glass plates 3 included in the laminated body 5 in the state of the glass plate package 1, a stretch made of, for example, resin, is provided around the glass plate package 1 as necessary. It may be wrapped with a film or covered with a bag.

Next, each element which comprises the glass plate package 1 is demonstrated in detail.

As shown in FIG. 2, the upper step portion 8 of the base portion 6 is composed of a lattice-shaped frame 8c made of a metal such as an aluminum alloy. In other words, the upper step portion 8 has a plurality of holes 8h penetrating the upper and lower surfaces of the upper step portion 8 in a portion where the frame 8c is not provided. Although not shown, the lower step 7 of the base 6 is also composed of a lattice-shaped frame made of a metal such as an aluminum alloy, and penetrates through the upper and lower surfaces of the lower step 7 into a non-framed portion. Has a plurality of holes. In addition, at four corners of the upper step portion 8, insertion ports 17 for inserting the support columns 9 are provided. Of course, when the column 9 is not provided, the insertion port 17 can be omitted.

As shown in FIG. 3, a rigid plate 12 is laid on the upper surface 8u of the upper step portion 8 so as to close the hole 8h. The rigid plate 12 is divided into a plurality of small plates 12p in the plane direction. In this embodiment, the rigid plate 12 is divided into three in the X1 direction along one side surface 8s of the upper step portion 8. The rigid plate 12 may be divided in the Y1 direction along the other side surface 8s of the upper step portion 8 orthogonal to the X1 direction, but in this embodiment, it is continuous without being divided in the Y1 direction. Although a gap may be formed between the adjacent small plates 12p, the adjacent small plates 12p are in contact with each other without a gap in this embodiment. As the rigid plate 12, it is preferable to use a metal plate such as an aluminum alloy or stainless steel (SUS). The thickness of the rigid plate 12 is preferably 2 to 20 mm.

As shown in FIG. 4, a first buffer plate 14 is laid on the upper surface 12u of the rigid plate 12. The first buffer plate 14 is divided into a plurality of small plates 14p in the plane direction. In this embodiment, the first buffer plate 14 is divided into three in the X1 direction at the same position as the rigid plate 12. The positions where the rigid plate 12 and the first buffer plate 14 are divided may be the same or different. The first buffer plate 14 may be divided in the Y1 direction, but in this embodiment, it is continuous without being divided in the Y1 direction. Although a gap may be formed between the adjacent small plates 14p, in the present embodiment, the adjacent small plates 14p are in contact with each other without forming a gap. As the first buffer plate 14, for example, it is preferable to use rubber, sponge rubber, resin, foamed resin, silicone or the like. When a foamed resin is used as the first buffer plate 14, it is preferable to use a relatively hard foam having a foaming ratio of 3 to 5 times. In this embodiment, polypropylene triple-expanded resin is used. The thickness of the first buffer plate 14 is preferably 2 to 20 mm.

As shown in FIG. 5, in the state where the rigid plate 12 and the first cushioning plate 14 are laid on the upper step portion 8 of the base portion 6, the peripheral portion (frame-shaped region) of each small plate 12p of the rigid plate 12 is arranged. A peripheral portion (frame-shaped region) of each small plate 14p of the first buffer plate 14 is supported from below by the skeleton 8c of the upper step portion 8. In other words, the holes 8h of the upper step portion 8 are not formed at the positions corresponding to the peripheral edge of each small plate 12p of the rigid plate 12 and the peripheral edge of each small plate 12p of the first buffer plate 14.

As shown in FIG. 6, the small plate 12p of the rigid plate 12 and the small plate 14p of the first buffer plate 14 are fixed to the upper step part 8 of the base part 6 by screwing at predetermined positions such as four corners. ing. In this embodiment, the small plate 12p of the rigid plate 12 and the small plate 14p of the first buffer plate 14 are screwed by a common screw 18. Specifically, a recess 19 is formed at the screwing position of the first buffer plate 14, and the head 18h of the screw 18 is housed in the recess 19. That is, the tip of the head portion 18h of the screw 18 is retracted below the upper surface 14u of the first buffer plate 14. In this state, the shaft portion 18s of the screw 18 penetrates from the first buffer plate 14 through the rigid plate 12 to the upper step portion 8. The screwing position is preferably provided outside the area where the stacked body 5 is actually arranged.

As shown in FIG. 7, a second buffer plate 15 is laid on the upper surface 14u of the first buffer plate 14. The second buffer plate 15 is divided into a plurality of small plates 15p in the plane direction. In this embodiment, the second buffer plate 15 is divided into four in the X1 direction. That is, the second buffer plate 15 has a larger number of divisions in the X1 direction than the first buffer plate 14. Furthermore, in this embodiment, the dividing position of the second buffer plate 15 and the dividing position of the first buffer plate 14 do not overlap. The number of divisions and the division position of the second buffer plate 15 may be the same as those of the first buffer plate 14. The second buffer plate 15 may be divided in the Y1 direction, but in this embodiment, it is continuous without being divided in the Y1 direction. A gap may be formed between the adjacent small plates 15p, but in this embodiment, the adjacent small plates 15p are in contact with each other without forming a gap between them. As the second buffer plate 15, for example, rubber, sponge rubber, resin, foamed resin, or silicone is preferably used. When the foamed resin is used as the second buffer plate 15, it is preferable to use a softer resin than the first buffer plate 14. In this embodiment, polyurethane foam is used. The second buffer plate 15 is adhesively fixed to the first buffer plate 14, for example. The thickness of the second buffer plate 15 is preferably 2 to 20 mm. In addition, in this embodiment, the thickness of the second buffer plate 15 is smaller than the thickness of the first buffer plate 14.

The laminated body 5 is arranged on the main surface support portion 11 configured as described above, that is, on the upper surface of the second buffer plate 15. In this state, as shown in FIG. 8, in the actual arrangement area of the laminated body 5 (corresponding to a rectangular area indicated by the alternate long and short dash line in the figure), the frame 8c of the upper step portion 8 of the base 6 is located. And a portion without the frame 8c (a portion with the hole 8h), the main surface support portion 11 is configured by reinforcing the buffer plate 13 with the rigid plate 12. Therefore, compared with the case where the main surface support portion 11 is formed of only the buffer plate 13, the rigidity of the main surface support portion 11 can be easily increased. Therefore, even if the thickness of the main surface support portion 11 is reduced, it is possible to prevent the main surface support portion 11 from bending at a position corresponding to the hole 8h of the upper step portion 8. In addition, since the rigid plate 12 is divided into a plurality of small plates 12p in the plane direction, even if a part of the rigid plate 12 is vibrated by an impact from outside (for example, from below), it is weakened at the divided parts and laminated. The influence of vibration on the body 5 can be prevented.

Here, when the glass plate 3 is thin (particularly, when the thickness of the glass plate 3 is 0.5 mm or less), when the main surface support portion 11 is bent at a position corresponding to the hole 8h of the upper step portion 8, the glass plate 3 is Even if it is not damaged, it may be deformed following the shape of the main surface support portion 11. Then, the position corresponding to the frame 8c is kept relatively high. As a result, the load of the glass plate 3 is concentrated on the position corresponding to the skeleton 8c, and as shown in FIG. 9, the foreign matter P contained in the protective sheet 4 may be transferred to the glass plate 3. Therefore, when paying attention to the transfer of the foreign matter P, it is preferable that the glass plate package 1 further includes the following configuration.

That is, the thickness of the glass plate 3 is T [mm], the thickness of each layer forming the laminated structure of the principal surface support portion 11 is D ₁ , D ₂ ... D _n [mm], and the elastic modulus of each layer is E ₁ , E. in case of a ₂ ... E _n [GPa], the glass plate pack 1 preferably satisfies the relationship defined in equation 1 above. As a result, the transfer of the foreign matter P to the glass plate 3 can be reduced as much as possible.

Formula 1 is derived by experiment. The basis is shown below.

The experiment was carried out by flatly stacking and transporting glass plates on pallets in which the material and thickness of the main surface support portion were changed, and then counting the number of foreign substances transferred to the glass plates of each pallet. The detailed experimental conditions are as follows.

As the glass plate, OA-10G manufactured by Nippon Electric Glass Co., Ltd. having a lateral dimension of 2200 mm and a longitudinal dimension of 2500 mm is used. The thickness of the glass plate is 0.7 mm, 0.5 mm, 0.4 mm, and 0.3 mm. Glass plates of each thickness are placed flat on each pallet with the same weight and a glass package is prepared. Each produced glass plate package is transported by truck along the same route of 200 km and then washed, and the number of transferred foreign matters of 1 μm or less on the surface of the glass plate is counted by an image inspection device. Transfer foreign matter having a size of more than 1 μm is removed by cleaning. Regarding the number of transferred foreign matters, the number of transferred foreign matters of 1 μm or less was less than 100, and 100 or more was “failed” in consideration of the defect occurrence rate in the past liquid crystal display manufacturing process. The number of transferred foreign matters is obtained by counting the number of transferred foreign matters on each glass plate loaded on the pallet and dividing the total number of transferred foreign matters on each glass plate by the number of laminated sheets, that is, the average value per glass plate. And

The plate material used for the main surface supporting portion of the pallet is expanded polypropylene (PP), hard polyvinyl chloride (PVC), stainless steel plate (SUS304), aluminum plate (Al), and the elastic modulus of each is PP: 1.5 GPa. , PVC: 4 GPa, SUS: 200 GPa, Al: 70 GPa. Then, one plate or two or more different plates are selected from these plate materials and used for the main surface support portion. When selecting two or more plate materials, the selected plate materials are stacked to form a laminated structure (however, the buffer plate is on the upper surface side). Further, each layer constituting the main surface support portion is divided into three in the plane direction (see, for example, FIG. 3 or 4).

Table 1 shows the above experimental results.

FIG. 10 is a graph showing the results of Table 1 in which the horizontal axis represents the glass plate thickness and the vertical axis represents the rigidity-related value represented by the left side of Formula 1. In FIG. 10, the number of transferred foreign matters is indicated by “◯”, and the number of transferred foreign matters is indicated by “X”.

From the result of FIG. 10, an approximate curve C1 which is a boundary between pass and fail is obtained. The approximate curve C1 is y=a/T+b. Here, T is a variable on the horizontal axis (thickness of the glass plate), y is a variable on the vertical axis (rigidity-related value of the main surface supporting portion), and a and b are constants. Then, in the obtained approximate curve C1, a becomes “1513” and b becomes “−771”, and the right side of Expression 1 is obtained. Then, as shown in FIG. 10, it can be recognized that the number of transferred foreign matters satisfies the acceptance criterion in a region where the rigidity-related value of the main surface support portion is larger than the approximate curve C1. Therefore, the relational expression defined in Expression 1 is derived.

(Second embodiment)
As shown in FIG. 11, the glass plate package 21 according to the second embodiment of the present invention includes a pallet 22 that supports a laminate 25 in which glass plates 23 and protective sheets 24 are alternately laminated in a vertical posture. In this embodiment, the protective sheets 24 are arranged on the forefront and the back of the laminate 25. The X2 direction and the Y2 direction in the figure are directions orthogonal to each other.

Suitable examples of the thickness, size, density, etc. of the glass plate 23 are the same as those of the glass plate 3 described in the first embodiment.

Suitable examples of the thickness, size, material, etc. of the protective sheet 24 are the same as those of the protective sheet 4 described in the first embodiment. It is preferable that the protective sheet 24 protrudes to both sides and above the width direction of the glass plate 23. The lower side position of the protective sheet 24 preferably coincides with the lower side position of the glass plate 23. That is, it is preferable that the protective sheet 24 does not protrude below the glass plate 23.

The pallet 22 includes a base 26 that is placed on the floor or the like. In this embodiment, the base portion 26 has a rectangular shape in a plan view.

Each of the four side surfaces 26s of the base portion 26 is provided with a fork hole 27 into which a fork of a forklift is inserted.

A back support portion 28 is provided upright on the rear side of the upper surface 26u of the base portion 26. A front surface 28f of the back support portion 28 is provided with a main surface support portion (back surface support portion) 29 that supports the back surface 25b (main surface of the glass plate 23) of the laminated body 25 from the rear side. The main surface support portion 29 is inclined so that the upper portion is located rearward of the lower portion. The main surface support portion 29 has a laminated structure in which a rigid plate 30 arranged on the back receiving portion 28 side (rear side) and a buffer plate 31 arranged on the laminated body 25 side (front side) are laminated. .. In this embodiment, the buffer plate 31 has a multilayer structure in which a first buffer plate 32 and a second buffer plate 33 are laminated. Here, if the total thickness of the main surface support portion 29 is increased, the loading space of the glass plate 23 is reduced and the loading efficiency of the glass plate 23 is reduced, so the total thickness of the main surface support portion 29 is 20 mm or less. Preferably.

A side support portion 34 is provided above the base portion 26 and in front of the back receiving portion 28 so as to engage with the base portion 26 and/or the back receiving portion 28. The side support portion 34 is a portion that supports the lower side 25l of the laminated body 25 (the lower side of the glass plate 23) from below. In the present embodiment, the side support portion 34 is fixed only to the base portion 26, but may be fixed to both the base portion 26 and the back receiving portion 28, or only the back receiving portion 28, for example. It may be fixed to. In the latter case, the side support portion 34 may be separated from the base portion 26 while being fixed to the back receiving portion 28.

The angle α formed by the main surface support portion 29 and the vertical surface is preferably 10 to 45° (18° in this embodiment). The angle β formed by the main surface support portion 29 and the side support portion 34 is preferably 85 to 95° (90° in this embodiment).

Here, although illustration is omitted, in order to restrict the movement of the stacked body 25 in the width direction, the side surface pressing plate may be detachably attached using a stopper such as a screw. It is preferable that the side surface pressing plate includes a mechanism capable of advancing and retracting with respect to the side surface 25 s of the laminated body 25, and has a configuration in which the position can be adjusted according to the widthwise dimension of the laminated body 25. It is preferable that the side surface pressing plate abuts on the edges of the protective sheet 24 protruding to both sides of the glass plate 23. In other words, it is preferable that the side pressing plate does not directly contact the glass plate 23. The side pressing plate may be omitted.

A front pressing plate (not shown) is arranged on the front surface 25f of the laminated body 25 (the front surface of the frontmost protection sheet 24 in this embodiment) in the state of the glass plate package 1, and the front pressing plate is fastened with a belt or the like. The laminated body 25 is held on the side support portion 34 and the main surface support portion 29 by pressing the back support portion 28 side with a member. As disclosed in, for example, Japanese Unexamined Patent Publication No. 2009-57051, a plurality of presser bars are arranged in parallel on the front surface of the front presser plate so as to straddle in the horizontal direction, and are vertically arranged at intervals. Both ends of each presser bar protruding from are pressed to the back receiving portion 28 side by a fastening member (belt or rod-shaped or pipe-shaped member capable of fixing the presser bar at a predetermined position in the longitudinal direction). It may be. As the front holding plate, for example, a cushioning plate such as a foamed resin sheet having a thickness thicker than that of the protective sheet 24 and having a high hardness is used. In addition, in order to prevent dust from adhering to the glass plates 23 included in the laminated body 25 in the state of the glass plate packing body 21, a stretch made of resin, for example, is provided around the glass plate packing body 21 as necessary. It may be wrapped with a film or covered with a bag.

Next, each element which comprises the glass plate package 21 is demonstrated in detail.

As shown in FIG. 12, the back support portion 28 is composed of a lattice-shaped frame 28c made of metal such as aluminum alloy. In other words, the back receiving portion 28 has a plurality of holes 28h penetrating the front and rear surfaces of the back receiving portion 28 in the portion where the frame 28c is not provided.

As shown in FIG. 13, a rigid plate 30 is laid on the front surface 28f of the back receiving portion 28 so as to close the hole 28h. The rigid plate 30 is divided into a plurality of small plates 30p in the plane direction. In this embodiment, the rigid plate 30 is divided into three in the X2 direction (vertical direction (vertical direction)). The rigid plate 12 may be divided in the Y2 direction (transverse direction (width direction)) orthogonal to the X2 direction, but in this embodiment, it is continuous in the Y2 direction without being divided. The rigid plate 30 may be divided into a plurality of pieces in the Y2 direction in a continuous state without being divided in the X2 direction. Although a gap may be formed between the adjacent small plates 30p, in the present embodiment, the adjacent small plates 30p are in contact with each other without a gap. As the rigid plate 30, it is preferable to use a metal plate such as an aluminum alloy or stainless steel (SUS). The thickness of the rigid plate 30 is preferably 2 to 20 mm.

As shown in FIG. 14, a first cushion plate 32 is laid on the front surface 30f of the rigid plate 30. The first buffer plate 32 is divided into a plurality of small plates 32p in the plane direction. In this embodiment, the first buffer plate 32 is divided into three in the X2 direction at the same position as the rigid plate 30. The positions where the rigid plate 30 and the first buffer plate 32 are divided may be the same or different. The first buffer plate 32 may be divided in the Y2 direction, but in this embodiment, it is continuous without being divided in the Y2 direction. The first buffer plate 32 may be divided into a plurality of pieces in the Y2 direction in a continuous state without being divided in the X2 direction. A gap may be formed between the adjacent small plates 32p, but in the present embodiment, the adjacent small plates 32p are in contact with each other without forming a gap. As the first buffer plate 32, for example, rubber, sponge rubber, resin, foamed resin, or silicone is preferably used. When a foamed resin is used as the first buffer plate 32, it is preferable to use a relatively hard foam having a foaming ratio of 3 to 5 times. In this embodiment, polypropylene triple-expanded resin is used. The thickness of the first buffer plate 32 is preferably 2 to 20 mm.

As shown in FIG. 15, in the state where the rigid plate 30 and the first cushion plate 32 are laid on the back receiving portion 28, the peripheral portion (frame-shaped region) of each small plate 30p of the rigid plate 30 and the first plate A peripheral portion (frame-shaped region) of each small plate 32p of the cushioning plate 32 is supported from behind by a frame 28c of the back receiving portion 28. In other words, the holes 28h of the back receiving portion 28 are not formed at the positions corresponding to the peripheral edge of each small plate 30p of the rigid plate 30 and the peripheral edge of each small plate 32p of the first buffer plate 32.

As shown in FIG. 16, the small plate 30p of the rigid plate 30 and the small plate 32p of the first buffer plate 32 are screwed and fixed to the back receiving portion 28 at predetermined positions such as four corners. In this embodiment, the small plate 30p of the rigid plate 30 and the small plate 32p of the first buffer plate 32 are screwed together by a common screw 35. Specifically, a recess 36 is formed at the screwing position of the first buffer plate 32, and the head 35h of the screw 35 is housed in the recess 36. That is, the tip of the head portion 35h of the screw 35 is retracted rearward from the front surface 32f of the first buffer plate 32. In this state, the shaft portion 35s of the screw 35 penetrates from the first buffer plate 32, through the rigid plate 30, to the back receiving portion 28. The screwing position is preferably provided outside the area where the stacked body 25 is actually arranged.

As shown in FIG. 17, a second buffer plate 33 is laid on the front surface 32f of the first buffer plate 32. The second buffer plate 33 is divided into a plurality of small plates 33p in the plane direction. In this embodiment, the second buffer plate 33 is divided into four in the X2 direction. That is, the second buffer plate 33 has a larger number of divisions in the X2 direction than the first buffer plate 32. Furthermore, in this embodiment, the dividing position of the second buffer plate 33 and the dividing position of the first buffer plate 32 do not overlap. The number and position of division of the second buffer plate 33 may be the same as that of the first buffer plate 32. Further, the second buffer plate 33 may be divided in the Y2 direction, but in this embodiment, it is continuous without being divided in the Y2 direction. The second buffer plate 33 may be divided into a plurality of pieces in the Y2 direction in a continuous state without being divided in the X2 direction. A gap may be formed between the adjacent small plates 33p, but in this embodiment, the adjacent small plates 33p are in contact with each other without forming a gap. As the second buffer plate 33, it is preferable to use, for example, rubber, sponge rubber, resin, foamed resin, silicone, or the like. When a foamed resin is used as the second buffer plate 33, it is preferable to use one that is softer than the first buffer plate 32. In this embodiment, polyurethane foam is used. The second buffer plate 33 is adhesively fixed to the first buffer plate 32, for example. The thickness of the second buffer plate 33 is preferably 2 to 20 mm. In addition, in this embodiment, the thickness of the second buffer plate 33 is smaller than the thickness of the first buffer plate 32.

The laminated body 25 is arranged on the main surface support portion 29 configured as described above, that is, on the front surface of the second buffer plate 33. At this time, the glass plate 23 included in the laminated body 25 has its main surface supported from the rear by the front surface of the second buffer plate 33, and its lower side supported by the side support portion 34 from below. In this state, as shown in FIG. 18, in the actual arrangement area of the laminate 25 (corresponding to the rectangular area indicated by the alternate long and short dash line in the figure), the portion where the frame 28c of the spine receiving portion 28 is located and the frame 28c. The main surface support portion 29 has a buffer plate 31 reinforced with a rigid plate 30. Therefore, as compared with the case where the main surface support portion 29 is formed only by the buffer plate 31, the rigidity of the main surface support portion 29 is easily increased. Therefore, even if the thickness of the main surface support portion 29 is reduced, it is possible to prevent the main surface support portion 29 from bending at a position corresponding to the hole 28h of the back receiving portion 28. Further, since the rigid plate 30 is divided into a plurality of small plates 30p in the plane direction, even if a part of the rigid plate 30 is vibrated by an impact from outside (for example, rearward or downward), the divided portion is weakened. It is possible to prevent the laminated body 25 from being affected by vibration.

Here, from the viewpoint of reducing the situation in which foreign matter (see FIG. 9) contained in the protective sheet 24 is transferred to the glass plate 23, the glass plate package 21 preferably further includes the following configuration.

That is, the thickness of the glass plate 23 is T [mm], the thickness of each layer constituting the laminated structure of the main surface support portion 29 is D ₁ , D ₂ ... D _n [mm], and the elastic modulus of each layer is E ₁ , E. ₂ ... E _n [GPa], it is preferable that the glass plate package 21 satisfy the relationship defined in the above-mentioned mathematical expression 2. As a result, transfer of foreign matter to the glass plate 23 can be reduced as much as possible.

Formula 2 is derived by experiment. The basis is shown below.

The experiment was carried out by stacking glass plates in a vertical posture on a pallet in which the material and thickness of the main surface supporting portion were changed and then transporting the pallets, and then counting the number of foreign substances transferred to the glass plates of each pallet. The detailed experimental conditions are as follows.

As the glass plate, OA-10G manufactured by Nippon Electric Glass Co., Ltd. having a lateral dimension of 2200 mm and a longitudinal dimension of 2500 mm is used. The thickness of the glass plate is 0.7 mm, 0.5 mm, 0.4 mm, and 0.3 mm. Glass plates of each thickness are vertically placed on each pallet and stacked with the same weight to produce a glass package. Each produced glass plate package is transported by truck along the same route of 200 km and then washed, and the number of transferred foreign matters of 1 μm or less on the surface of the glass plate is counted by an image inspection device. Transfer foreign matter having a size of more than 1 μm is removed by cleaning. Regarding the number of transferred foreign matters, the number of transferred foreign matters having a size of 1 μm or less was less than 100, and “100” or more was “failed” in consideration of the defect occurrence rate in the past liquid crystal display manufacturing process. The number of transferred foreign matters is a value obtained by counting the number of transferred foreign matters on each glass plate loaded on the pallet and dividing the total number of transferred foreign matters on each glass plate by the number of laminated sheets, that is, the average value per glass plate. And

The plate material used for the main surface supporting portion of the pallet is expanded polypropylene (PP), hard polyvinyl chloride (PVC), stainless steel plate (SUS304), aluminum plate (Al), and the elastic modulus of each is PP: 1.5 GPa. , PVC: 4 GPa, SUS: 200 GPa, Al: 70 GPa. Then, one plate or two or more different plates are selected from these plate materials and used for the main surface support portion. When selecting two or more plate materials, the selected plate materials are stacked to form a laminated structure (however, the buffer plate is on the front side). Further, each layer constituting the main surface support portion is divided into three in the plane direction (see, for example, FIG. 13 or FIG. 14).

Table 2 shows the above experimental results.

FIG. 19 shows a graph of the results of Table 2 in which the horizontal axis represents the glass plate thickness and the vertical axis represents the rigidity-related value represented by the left side of Formula 2. In FIG. 19, the number of transferred foreign matters is indicated as “◯”, and the number of transferred foreign matters is indicated as “X”.

From the result of FIG. 19, an approximate curve C2 that is a boundary between pass and fail is obtained. The approximated curve C2 is y=a/T+b. Here, T is a variable on the horizontal axis (thickness of the glass plate), y is a variable on the vertical axis (rigidity-related value of the main surface supporting portion), and a and b are constants. Then, in the obtained approximate curve C2, a becomes “801” and b becomes “289”, and the right side of Expression 2 is obtained. Then, as shown in FIG. 19, it can be recognized that the number of transferred foreign matters satisfies the acceptance criterion in a region where the rigidity-related value of the main surface support portion is larger than the approximate curve C2. Therefore, the relational expression defined in Expression 2 is derived. Here, the relationship of Expression 2 has been confirmed by experiments that the angle formed by the main surface support portion and the vertical surface is maintained in the range of 13 to 23°. On the other hand, it has been experimentally confirmed that the angle formed by the main surface support portion and the side support portion does not directly affect the relationship of Expression 2.

Although the glass plate pallet according to the embodiment of the present invention and the glass plate packaging body using the same have been described above, the embodiment of the present invention is not limited to this and various without departing from the scope of the present invention. It is possible to make changes.

In the above embodiment, the case where the buffer plate is composed of the first buffer plate and the second buffer plate has been described, but the buffer plate may be a single layer, or may be a multilayer having three or more layers. Good.

Further, in the above embodiment, the case where the rigid plate and the first cushion plate are screwed to the base portion or the back support portion and the second cushion plate is bonded to the first cushion plate has been described. The method of fixing each layer constituting the part is not particularly limited, and any method can be adopted. For example, all layers constituting the main surface supporting portion may be fixed by adhesion. Examples of the adhesive fixing method include double-sided tape, adhesive, and welding. Further, each of the layers constituting the main surface supporting portion may be fixed by using these adhesive fixing methods and screwing together.

1 Glass Plate Packing Body 2 Pallet 3 Glass Plate 4 Protective Sheet 5 Laminated Body 6 Base Part 7 Lower Step 8 Upper Step 8c Frame 8h Hole 9 Support 10 Fork Hole 11 Main Surface Support 12 Rigid Plate 12p Small Plate 13 Buffer Plate 14 First Buffer Plate 14p Small Plate 15 Second Buffer Plate 15p Small Plate 16 Side Holding Plate 17 Insertion Port 18 Screw 21 Glass Plate Packing 22 Pallet 23 Glass Plate 24 Protective Sheet 25 Laminate 26 Base Part 27 Fork Hole 28 Back support part 28c Frame 28h Hole 29 Main surface support part 30 Rigid plate 30p Small plate 31 Buffer plate 32 First buffer plate 32p Small plate 33 Second buffer plate 33p Small plate 34 Side support part 35 Screw

Claims (16)

A glass plate pallet for packing a laminated body formed by flatly stacking a plurality of glass plates,
A base part made of a lattice-shaped frame in which a plurality of holes are formed,
A main surface support portion provided on the upper surface of the base portion and supporting the main surface of the glass plate of the laminated body from below,
The main surface support portion has a laminated structure including a rigid plate laid on the upper surface of the base portion so as to close the hole, and a buffer plate laid on the upper surface of the rigid plate,
A pallet for glass plates, wherein the rigid plate is divided into a plurality of small plates in a plane direction. The pallet for glass plates according to claim 1, wherein the buffer plate is divided into a plurality of small plates in a plane direction. The glass plate pallet according to claim 1 or 2, wherein the rigid plate and the buffer plate are detachably screwed to the base portion. The pallet for glass plates according to any one of claims 1 to 3, wherein the skeleton of the base is provided along the peripheral edge of each of the small plates of the rigid plate. The pallet for glass plates according to any one of claims 1 to 4, wherein the buffer plate has a laminated structure including a layer made of foamed resin. A part including the main surface supporting portion of the glass plate pallet according to any one of claims 1 to 5, which supports a laminated body in which glass plates and protective sheets are alternately stacked flat. Glass plate packaging characterized by. The thickness of the glass plate is T [mm], the thickness of each layer constituting the laminated structure of the main surface supporting portion is D ₁ , D ₂ ... D _n [mm], and the elastic modulus of each layer is E ₁ , E ₂ . If E _n [GPa],
The glass plate package according to claim 6, wherein the following relationship is established. The glass plate package according to claim 7, wherein the total thickness of the main surface support portion is 20 mm or less. The glass plate package according to claim 7 or 8, wherein the glass plate has a thickness of 0.5 mm or less. A glass plate pallet for packing a laminated body formed by stacking a plurality of glass plates in a vertical posture,
Base part,
A back support part formed of a lattice-shaped frame in which a plurality of holes are formed rising from the rear side of the base part,
A main surface support portion provided on the front surface of the back support portion and supporting the main surface of the glass plate of the laminated body from the rear,
A side support part that is provided in engagement with the base part and/or the back support part and supports the side of the glass plate of the laminated body from below;
The main surface support portion has a laminated structure including a rigid plate laid on the front surface of the spine receiving portion so as to close the hole, and a buffer plate laid on the front surface of the rigid plate,
A pallet for glass plates, wherein the rigid plate is divided into a plurality of small plates in a plane direction. The pallet for glass plates according to claim 10, wherein the buffer plate is divided into a plurality of small plates in a plane direction. The glass plate pallet according to claim 10 or 11, wherein the rigid plate and the buffer plate are detachably screwed to the back receiving portion. The pallet for glass plates according to any one of claims 10 to 12, wherein a frame of the back receiving part is provided along a peripheral edge of each of the small plates of the rigid plate. The glass plate pallet according to any one of claims 10 to 13, wherein the buffer plate has a laminated structure including a layer made of foamed resin. A laminate comprising a glass plate and a protective sheet, which are alternately laminated in a vertical posture, in a portion including the main surface supporting portion and the side supporting portion of the glass plate pallet according to any one of claims 10 to 14. A glass plate package characterized by supporting a body. The angle formed by the main surface support portion and the vertical surface is 13 to 23°,
The thickness of the glass plate is T [mm], the thickness of each layer constituting the laminated structure of the main surface supporting portion is D ₁ , D ₂ ... D _n [mm], and the elastic modulus of each layer is E ₁ , E ₂ . If E _n [GPa],
The glass plate package according to claim 15, wherein the following relationship is established.