JP4911326B2 - Glass plate packing unit - Google Patents

Description

  The present invention relates to a glass plate packing unit, and more particularly to a technique for packing a plurality of glass plates with a protective sheet material interposed therebetween.

  As is well known, glass plates used for manufacturing glass panels for various image display devices such as liquid crystal displays, plasma displays, electroluminescence displays, field emission displays, etc., as well as substrates for forming various electronic display functional elements and thin films. A glass plate or the like used as a material is usually conveyed as a packing unit from a glass maker or the like to a display maker or the like in a state where a plurality of sheets are stored and held as a group.

  In addition, for example, in manufacturing the above-described various image display devices and the like, a technique in which a plurality of glass panels are created from a single glass sheet has been adopted, and the glass manufacturers are molded and processed accordingly. The current situation is that large glass is being promoted. More specifically, for example, when manufacturing a glass panel of a liquid crystal display, a multi-system in which a large number of glass panels are formed in a large plate glass is employed for the purpose of reducing manufacturing cost and improving production efficiency (throughput). Therefore, attempts have been made to make the raw glass produced by glass manufacturers as large as possible, or they have been put to practical use.

  Specifically, in the initial stage of practical mass production, the size of the base glass was about 300 × 400 mm, but after that, with the increase in the number of glass panels taken, the size of 370 × 470 mm, 550 × 650 mm The size of the glass plate has increased to 680 × 680 mm size, 1000 × 1200 mm size, etc., and currently, a glass plate of 1500 × 1850 mm size (thickness of about 0.7 mm) has been produced.

  In this case, the glass plates listed above and the glass plates according to them are actually thin and easy to break with such a large plate, and the packaging is strictly Need to do. And when packing this kind of glass plate, as described in the following Patent Documents 1 and 2, using a protective pad for buffering or a separating member, a plurality of glass plates are arranged at regular intervals. It was customary to pack in a vertical orientation or a substantially vertical orientation in parallel. In addition, according to the following Patent Document 3, a packaging technique in which a plurality of glass plates are stored in a stacked manner in a horizontal posture in a pallet whose bottom surface, top surface, and four side surfaces are all configured by a frame. Is disclosed.

JP-A-5-319456 JP 2000-203679 A JP 2000-191666 A

By the way, as disclosed in the above-mentioned Patent Documents 1 and 2, if the glass plates are arranged in parallel in a vertical posture and packed, the above-described increase in the size of the glass plate and the increase in weight due to this increase. Along with this, there is a risk that the glass plate itself will be unduly bent and deformed by its own weight, and the cushioning material etc. receiving the lower end of the glass plate will be unjustly compressed and exhibit a cushion function or an impact mitigation function. become unable. For this reason, not only the probability of occurrence of breakage of the glass plate due to vibrations during transportation, etc. increases, but also the buffer material etc. may deteriorate early and become difficult to use repeatedly, which is disadvantageous in terms of cost. .

  In order to deal with such a problem, as disclosed in Patent Document 3 above, it is only necessary to mount a plurality of glass plates in a stacked manner in a horizontal posture inside the pallet. Since the pallet disclosed in the same document is composed of a frame around the entire periphery, the glass plate is in a state of being largely open to the external space. For this reason, a foreign matter such as dust or dust existing in the external space enters the inside of the pallet and is sandwiched between the glass plates. And when each glass plate moves relatively by carrying this pallet, the glass plate and the foreign material are rubbed, resulting in defects such as scratches on the surface of the glass plate. Invite.

  In addition, the same document does not disclose what kind of configuration is between the glass plates in the horizontal posture, and therefore, if a spacing member is interposed between the glass plates, In this case, in order to appropriately prevent the relative movement between the glass plates and the generation of scratches on the glass plate due to foreign matters, it becomes a problem as to what separation member is optimally interposed.

  The present invention has been made in view of the above circumstances, and after avoiding problems caused by packaging each glass plate in a vertical orientation, the glass plate is relatively moved relative to each other and the glass plate is damaged by foreign matter. The technical challenge is to be able to cope with the occurrence of such problems.

The glass plate packaging unit according to the present invention, which has been made to solve the above technical problem, has a plurality of glass plates placed over the entire surface or substantially the entire surface of the glass plate between each other above a pallet serving as a base. And a foamed resin sheet having a width dimension and a depth dimension longer than that of the glass plate and a thickness of 0.3 to 5.0 mm and a foaming ratio of 10 to 40 times. The foamed resin sheet protrudes from the entire periphery of the outer peripheral edge of the glass plate and the protruding portion can be bent .

  In this case, the foamed resin sheet preferably does not contain an antistatic agent in order to prevent adhesion of dirt when it comes into contact with the surface of the glass plate. However, even if the material itself contains a foamed resin sheet containing an antistatic agent (for example, a polymer type antistatic agent) or a surfactant without using a surfactant, a high molecular weight type surfactant is used. Since the foamed resin sheet using the agent hardly causes a problem of adhesion of dirt when contacting the surface of the glass plate, these foamed resin sheets can be used as a protective sheet material. In addition, since the foamed resin sheet using a low molecular weight type surfactant has a lot of dirt when it comes into contact with the surface of the glass plate, avoid using this foamed resin sheet as a protective sheet material. Be wise.

  According to such a configuration, since the foamed resin sheet is used as a protective sheet material interposed between the glass plates, good cushioning properties can be obtained as compared to paper and resin films. The impact acting on each glass plate at the time of conveyance or the like is moderated appropriately. In addition, since the surface of the foamed resin sheet has higher adhesion (or frictional resistance or contact resistance) to the surface of the glass plate than paper such as slip paper, the glass plate slides against the foamed resin sheet. The probability that relative movement will occur between the two becomes extremely low. Therefore, even if foreign matter such as dust or dirt is present between the glass plate and the foamed resin sheet, the probability that the foreign matter will rub against the surface of the glass plate is reduced, and the foreign matter causes the glass plate. It is difficult to cause problems such as scratches on the surface. Furthermore, the foamed resin sheet interposed between each of the plurality of glass plates is in contact with the entire surface or substantially the entire surface of the glass plate, and has a width direction dimension and a depth direction dimension rather than the glass plate. Since it is set to be long, it can be in a state of protruding from the entire outer peripheral edge of the glass plate to the outer peripheral side, whereby the protection of each glass plate is appropriately performed. In this case, the width direction dimension and the depth direction dimension of the foamed resin sheet are longer by, for example, 20 mm to 100 mm than the width direction dimension and the depth direction dimension of the glass plate, respectively. In addition, since the foaming ratio of the foamed resin sheet is 10 to 40 times, it is possible to avoid a situation such as tearing while ensuring an appropriate cushioning property for the glass plate of the foamed resin sheet. . That is, when the foaming ratio of the foamed resin sheet is less than 10 times, the foamed resin sheet becomes too hard, so that the required cushioning property cannot be obtained and the glass plate cannot be sufficiently protected. On the other hand, when the foaming ratio of the foamed resin sheet exceeds 40 times, the foamed resin sheet becomes too soft, so that it tends to be torn and difficult to handle during the storing operation. Therefore, if the expansion ratio of the foamed resin sheet is within the above numerical range, such a problem does not occur. In this case, the more preferable expansion ratio of the foamed resin sheet is 20 to 30 times.

Furthermore, in the glass plate packaging unit according to the present invention, the thickness of the foamed resin sheet is 0.3 to 5.0 mm .

  In this way, when a plurality of glass plates are stored in a horizontal posture with a foamed resin sheet interposed between them, the glass plates are sufficiently protected and the like with respect to the vertical direction. Unfair bulkiness can be avoided. That is, if the thickness of the foamed resin sheet is less than 0.3 mm, the cushioning function and the buffering function that the foamed resin sheet originally has cannot be sufficiently exhibited, and the protection of the glass plate is hindered. In addition, since the foamed resin sheet is too thin, tearing is likely to occur, and handling during storage operations becomes difficult. On the other hand, when the thickness of the foamed resin sheet exceeds 5.0 mm, even if the number of laminated glass plates is not so large, it becomes unduly bulky in the vertical direction. Therefore, if the thickness of the foamed resin sheet is within the above numerical range, such a problem does not occur. In this case, the more preferable thickness of the foamed resin sheet is 0.5 to 2.0 mm.

  As described above, according to the glass plate packaging unit of the present invention, the foamed resin sheet interposed between the glass plates is in contact with the entire surface or substantially the entire surface of the glass plate. And, since the width direction dimension and the depth direction dimension are set to be longer than the glass plate, it can be in a state of protruding from the entire outer peripheral edge of the glass plate to the outer peripheral side. It is possible to appropriately protect. In addition, since the foaming ratio of the foamed resin sheet is 10 to 40 times, it is possible to avoid a situation such as tearing while ensuring an appropriate cushioning property for the glass plate of the foamed resin sheet. .

And since the thickness of the foamed resin sheet is in the range of 0.3 mm to 5.0 mm, it is possible to prevent the glass plate from being unduly bulky in the vertical direction after sufficient protection of the glass plate is made. It becomes possible to do.

It is a schematic perspective view which shows typically the whole structure of the glass plate packing unit which concerns on embodiment of this invention. It is a components disassembled arrangement perspective view which shows typically some composition of a glass plate packing unit concerning an embodiment of the present invention. It is a component disassembled arrangement perspective view which shows the whole schematic structure of the glass plate packing unit which concerns on embodiment of this invention. It is a vertical front view which shows the whole structure of the glass plate packing unit which concerns on embodiment of this invention. It is a vertical side view which shows the whole structure of the glass plate packing unit which concerns on embodiment of this invention. It is an enlarged vertical front view which shows the principal part of the glass plate packing unit which concerns on embodiment of this invention. It is a schematic perspective view which shows the manufacture condition of the glass plate packing unit which concerns on embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic perspective view schematically showing an overall configuration of a glass plate packaging unit (hereinafter simply referred to as a packaging unit) according to an embodiment of the present invention, and FIG. 2 is a unit packaging body that is a component of the packaging unit. FIG. 3 is a perspective view of an exploded view of the entire packaging unit, FIG. 4 is a front elevation view of the packaging unit, and FIG. 5 is a perspective view of the packaging unit. FIG. 6 is an enlarged vertical front view of a main part of a unit package that is a component of the packing unit.

  As shown in FIG. 1, a packaging unit 1 according to this embodiment includes unit packaging bodies 2 stacked in a plurality of stages (for example, 10 to 50 stages) in the top and bottom, and a box that covers the periphery of these unit packaging bodies 2. The outer envelope body 3 is fixed to the upper surface of the pallet 4 serving as a base. In addition, this outer enclosure 3 can also be comprised with the stretch film wound around the unit package 2 stacked in multiple steps.

  As shown in FIG. 2, the unit package 2 includes a box 5 having four side walls 5 a that cover the entire surface of the four sides and a bottom wall 5 b that covers the entire surface of the bottom. In the space 6, the foamed resin sheet 7 as a protective sheet material and the glass plate 8 are stored in a stacked manner in a horizontal posture in order from below, and the uppermost portion is used as the foamed resin sheet 7, and then the entire upper surface thereof. Is covered with an upper wall portion 5c made of a buffer plate material.

  More specifically, as shown in FIG. 3, the outer enclosure 3 has four sides of a reinforcing frame assembly 3a made of metal (aluminum, aluminum alloy, steel, etc., hereinafter referred to as metal). Four side plates 3b and a bottom plate 3c are attached to the inner surface of the portion and the inner surface of the bottom portion, respectively, and the entire surface of the four side portions and the entire surface of the bottom portion are covered by these side plates 3b and the bottom plate 3c. In this case, the four side plates 3b and the bottom plate 3c are made of resin, and the bottom plate 3c may also be used as the top plate of the pallet 4 without being separately attached. In addition, the side plate 3b located in front of the four side plates 3b can be removed outward. As shown in FIGS. 4 and 5, the entire upper portion of the outer enclosure 3 is covered with an upper lid plate 3d made of resin.

  On the other hand, as shown in FIGS. 3 and 6, the box 5 constituting the unit packaging body 2 has a rectangular frame-shaped metal reinforcing frame 5w, and the reinforcing frame 5w is an outer frame member. An inner frame member 5y is fixed to the lower inner surface of 5x. Of these, the outer frame member 5x constitutes the four side wall portions 5a, and the inner frame member 5y and the bottom covering plate 5z fixed to the upper surface thereof are the bottom wall portion. 5b. A reinforcing bar positioned on the lower surface of the bottom covering plate 5z is fixed to the reinforcing frame 5w. The bottom covering plate 5z is made of a thin metal plate, a resin plate, or a composite plate of resin and metal.

  A bottom buffer plate 5e is laid on the upper surface of the bottom covering plate 5z of the box 5, the foamed resin sheet 7 and the glass plate 8 are stacked in a plurality of stages on the upper surface, and the upper wall is further formed on the upper surface. The upper lid buffer plate 5f as the portion 5c is placed, and thereby the unit package 2 is configured. As shown in FIGS. 3 to 5, the unit package 2 is stacked in a plurality of stages on the bottom plate 3 c of the outer enclosure 3, and the uppermost portion is covered with the upper cover plate 3 d of the outer enclosure 3. A packaging unit 1 is configured.

In this embodiment, the glass plate 8 is a base plate glass for a liquid crystal display having a width direction dimension of 1500 mm, a depth direction dimension of 1850 mm, and a thickness of 0.7 mm. The foamed resin sheet 7 is a foamed polyethylene sheet (trade name: Miramat) manufactured by Nippon Styrene Paper Co., Ltd. having a thickness of 0.5 mm to 1.0 mm and an expansion ratio of 20 to 25, and has a width-direction dimension. It is 1550 mm and the dimension in the depth direction is 1900 mm. And the inner surface of the four side wall parts 5a of the box 5 in the unit package 2 has a width direction dimension of 1550 mm and a depth direction dimension of 1900 mm, and is the same dimension as the foamed resin sheet 7. In this case, in the unit package 2, since the glass plate 8 is placed on the central portion of the foamed resin sheet 7, the foamed resin sheet 7 protrudes by about 25 mm from the entire outer periphery of the glass plate 8. It has become. Then, taking into consideration that the glass plate laminate comprising the glass plate 8 and the foamed resin sheet 7 is stored in the internal storage space 6 of the box 5, the description of FIGS. 1 and 2 is taken into consideration. For example, above the pallet 4, a plurality of glass plates 8 are in contact with each other over the entire surface or substantially the entire surface of the glass plate 8, so that the width dimension and the depth direction dimension are larger than the glass plate 8. Is stored in a stacked manner in a horizontal posture with a foamed resin sheet 7 having a predetermined foaming ratio set to be long. Moreover, as shown in FIG. 2, since the foamed resin sheet 7 can be bent, as described above, when the foamed resin sheet 7 protrudes from the entire outer periphery of the glass plate 8. The protruding portion can be bent.

  The packaging unit 1 having the above configuration is manufactured as follows. That is, as shown in FIG. 7, the glass plate 8 conveyed by the conveyor 10 in the clean room 9 and the foamed resin sheet 7 that is also placed in the clean room 9 in a laminated manner are, for example, vacuumed. In the state where the foamed resin sheet 7 is stacked and placed on the upper surface of the single glass plate 8, it is sequentially stacked in a horizontal posture in the internal storage space 6 of the box 5. Then, when the glass plate 8 of about 5 to 20, preferably about 10, is stored in the box 5, the upper lid buffer plate 5f is placed on the upper end portion of the unit package 2 to complete the production. The manufactured unit package 2 is carried out of the clean room 9 from the next to the next.

  In this way, the unit packaging bodies 2 sequentially carried out to the outside of the clean room 9 are stacked in the horizontal posture in order from the bottom inside the outer enclosure 3 that is in a standby state outside the clean room 9. At this time, the side plate 3b on the front surface of the outer enclosure 3 is in a removed state, and therefore the unit package 2 is stacked inside using the front opening of the outer enclosure 3. 4 and 5, when the unit package 2 is stacked in about 30 stages, the side unit 3b is fitted and fixed to the front opening of the outer enclosure 3 to fix the unit 1 Is completed.

  The packaging unit 1 manufactured in this way is transported from the site to, for example, a display manufacturing factory or the like with the glass plate 8 maintained in a horizontal posture. In this case, in the packing unit 1, the box 5 and the outer enclosure 3 are used as returnable boxes, but the other items are not returned once transported.

1 Packing unit (glass plate packing unit)
4 Pallet 7 Foamed resin sheet 8 Glass plate

Claims (1)

Above the base pallet, a plurality of glass plates are in contact with each other over the entire surface or almost the entire surface of the glass plate, and the width direction dimension and the depth direction dimension are set to be longer than the glass plate. And a foamed resin sheet having a thickness of 0.3 to 5.0 mm and a foaming ratio of 10 to 40 is interposed between the foamed resin sheets and stored in a horizontal posture, and the foamed resin sheet is an outer peripheral edge of the glass plate. A glass plate packaging unit characterized in that it protrudes from the entire periphery and the protruding portion can be bent .

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