JP5594502B2 - Glass plate packaging method and glass plate packaging - Google Patents

Description

  The present invention relates to a method for transporting a package of glass plates. In particular, the present invention relates to a method for transporting a glass plate package that accommodates an intermediate glass product of a thin glass substrate used in a flat panel display such as a liquid crystal display or an organic EL element.

  In recent years, there is an increasing need for large mother glass substrates having a thickness of 1 mm or less, which are used for glass substrates for liquid crystal displays and organic EL elements. As the external size, one having a side of 2800 mm or more, 3100 mm or more, 3300 mm or more, 3600 mm or more is known.

  In general, the mother glass substrate is manufactured at a glass plate manufacturing factory, and then accommodated as a predetermined package, loaded into a transportation vehicle, and transported to a display panel manufacturing factory. Alternatively, a method in which a glass plate manufacturing plant and a display panel manufacturing plant are installed in close proximity to each other and directly sent between the two plants has been studied.

  In such a case, if a certain number of large mother glass plates are to be accommodated in a flat stacking container, the width of the container will be the loading limit width of the transport vehicle (2500 mm (effective internal dimension: about 2380 mm): Because it exceeds Article 1 (1)), it cannot be mounted on the platform of transport vehicles. In addition, the size of the width itself becomes an obstacle, and the conveyance becomes difficult.

  Then, the container disclosed by patent document 1 is known as a container which accommodates such a large sized glass plate.

  The container of Patent Document 1 includes a base on which a concave curved surface is formed, and a plurality of glass plates are stacked on the curved surface of the base. Thereby, a glass plate is laminated | stacked in the state bent along the said curved surface. Therefore, the linear dimension of the glass plate in the bending direction is shortened, and the width dimension of the entire container can be shortened. Therefore, by using the container disclosed in Patent Document 1, even a glass plate having a width exceeding the loading limit width of the transport vehicle can be mounted on the transport vehicle and transported.

JP 2007-106419 A

  However, since the container disclosed in Patent Document 1 is a glass plate that is flatly stacked on the curved surface of the base, the glass plate must be cut into a size corresponding to the aforementioned loading limit width and stored. There was the fault that the above large sized glass plate cannot be accommodated and conveyed.

  Further, when the glass plate is stored in the storage container of Patent Document 1, there is a limit in the number of glass plates loaded in one storage container, and thus there is a disadvantage that the storage efficiency of the glass plate cannot be increased. there were.

  The present invention has been made in view of such circumstances, and can accommodate a large-sized glass plate under a condition limited to the loading limit width of a transportation vehicle, and can increase the storage efficiency of the glass plate. It aims at providing the conveyance method of the package body of a board.

That is, in the first aspect of the present invention, a glass plate having a thickness T (mm) is wound around a cylindrical body having a radius R (mm), the Young's modulus of the glass plate is E (MPa), and the glass plate is allowed. Assuming that the maximum value of tensile stress is σmax (MPa), in the method for transporting a package of glass plates that satisfies the following formulas 1, 2 and 3, the package of glass plates is accommodated inside the transport means. The glass plate package is in a position where the cylindrical body of the glass plate package and the side surface of the glass plate after winding are perpendicular or parallel to the traveling direction of the transport means. The cylindrical body is loaded in a transportation means, and the cylindrical body has an elliptical shape. The radius of curvature of the long diameter side of the cylindrical body is set to R, and a glass plate is wound around the cylindrical body from a position on the extension of the short diameter. All package of glass sheets, characterized in that To provide a delivery method.

R ≧ T · E / 2σmax (1)
0.15 ≦ T ≦ 0.7 mm (2)
σmax = 50 MPa (3)
Aspect 2 provides a method for transporting a package of glass plates according to aspect 1, wherein T ≦ 0.3 mm.

  Aspect 3 is a method of transporting a glass plate package according to claim 1 or 2, wherein the length L in the longitudinal direction of the glass plate when the glass plate wound around the cylindrical body is extended is 500 m or more. provide.

  Aspect 4 provides a method for transporting a glass plate package according to Aspect 1, 2 or 3, wherein the width W in the axial direction of the cylindrical body of the glass plate is 0.3 m or more.

  Aspect 5 provides the method for transporting a package of glass plates according to Aspect 1, 2, 3 or 4, wherein the glass plate is alkali-free glass.

  Aspect 6 provides a method for transporting a package of glass plates according to any one of aspects 1 to 5, wherein a slip sheet is interposed between the wound glass plates.

In aspect 7, a glass plate having a thickness T (mm) is wound around a cylindrical body having a radius R (mm), the Young's modulus of the glass plate is E (MPa), and the maximum allowable tensile stress of the glass plate Is σmax (MPa), in the glass plate package satisfying the following formulas 1, 2 and 3, the cylindrical body has an elliptical shape, and the radius of curvature on the major axis side of the cylindrical body is set to R. by a glass plate to provide a package of glass sheets, characterized in that wound from a position on the extension of the minor axis with respect to the cylinder body.
R ≧ T · E / 2σmax (1)
0.15 ≦ T ≦ 0.7 mm (2)
σmax = 50 MPa (3)

  In this invention, according to aspect 1, it can pack and convey efficiently, without damaging a glass plate. That is, a radius of a cylindrical body (which may be a columnar body) around which a long glass plate can be wound is set to a predetermined size, and the glass plate is wound around and accommodated in the cylindrical body.

  According to this package, since it is not necessary to cut the glass plate into a size corresponding to the load limit width as in Patent Document 1, a large size glass plate is accommodated while being limited to the load limit width of the transport vehicle. it can.

  Moreover, according to this package, since the maximum value (σmax) of the tensile stress is set to 50 MPa, a sufficient safety factor is ensured, and the glass plate as an intermediate product is transported from one point to another. can do.

  In the aspect 2, the ultra-thin glass plate can be easily handled. In aspect 3, a long glass plate can be easily packed. In aspect 4, the glass plate of the size more than predetermined width can be handled.

  In the aspect 5, the package suitable for the high standard use in which surface quality is calculated | required can be provided.

  In Aspect 6, as a package, interleaving paper is interposed between the glass plates, thereby preventing a crack during storage or transport and providing a glass plate with few defects on the surface. The interleaving paper includes not only paper but also a resin film.

In Aspects 1 and 7, the cylindrical body has an elliptical shape, the radius of curvature on the long diameter side of the cylindrical body is set to R, and a glass plate is wound around the cylindrical body from a point on the extension of the short diameter. Further, the glass plate can be prevented from being damaged due to the defect of the edge of the glass plate.

  In the first aspect, it is possible to provide a transport method that is more efficient in handling and unpacking than the conventional one, and that is very easy to handle.

  The glass plate used for this invention is manufactured as a normal plate glass. A float method is known as a method for producing a glass plate, but a glass plate having a desired thickness is continuously supplied by other production methods such as a redraw method, a slotted down draw method, an overflow down draw method, etc. You may make it do.

  When the plate thickness of the glass plate is reduced, for example, an ultra-thin glass plate satisfying T ≦ 0.3 mm, particularly T ≦ 0.1 mm, is continuously manufactured using a downdraw method.

  The present invention is suitable for an extremely thin glass plate, T ≦ 0.7 mm, T ≦ 0.5 mm, and T ≦ 0.3 mm. Particularly, it is suitable for an ultra-thin glass plate having T = 0.15 mm.

Here is a simple example:
T = 0.5mm
σ = 50 MPa
When E = 7.55 × 10 ⁴ MPa The radius R of the cylindrical body is about 380 mm.

  Therefore, in a cylindrical body having a diameter of 760 mm, a belt-like glass plate can be wound and accommodated until the diameter reaches 2380 mm (loading limit width of the transportation vehicle). In this case, the upper limit of the width | variety of a glass plate can be made into the length of the loading platform of a transport vehicle.

  Further, since the glass plate is wound about 1620 times around the cylindrical body, the length of the glass plate is 7900 m or more even by simple calculation. Therefore, when the length of the loading platform of the transportation vehicle is 5 m, a large glass plate of 5 m × 4300 m size can be wound around the cylindrical body and accommodated. Therefore, according to the packaging body of the glass plate of the present invention, a large-size glass plate can be accommodated under the condition limited to the limit width of the transport vehicle, and the storage efficiency of the glass plate can be increased.

  According to the package of glass plates, the radius R of the cylindrical body where the maximum allowable tensile stress (σmax) of the glass plate generated when the glass plate having a thickness T is wound around the cylindrical body is 50 MPa Since the glass plate is continuously wound and accommodated on the cylindrical body having the radius R, the large-size glass plate can be accommodated under a condition limited to the loading limit width of the transport vehicle, and The storage efficiency of the glass plate can be increased.

  According to the method for transporting a package of glass plates according to the present invention, a large glass plate can be accommodated in a situation where it is limited to the limit width of the transport vehicle, and the storage efficiency of the glass plate can be increased.

Schematic diagram of glass sheet winding device Schematic diagram showing the state of transporting the package of glass plates by truck Explanatory drawing showing an example of elliptical winding of a glass plate

  Hereinafter, a preferred embodiment of a method for transporting a package of glass plates according to the present invention will be described with reference to the drawings.

  In FIG. 1, while winding the glass sheet G around a substantially circular roll (cylindrical body) 10 and supplying the slip sheet 12 so that the slip sheet 12 is interposed between the glass sheet G and the glass sheet G, A winding device 14 for the glass plate G for continuously winding the glass plate G and the interleaf paper 12 around the roll 10 is shown.

  The glass plate G is a non-alkali glass manufactured by a float kiln (not shown) which is a thin glass plate manufacturing apparatus, and is continuously sent out from a slow cooling furnace (not shown) installed at the subsequent stage of the float kiln. . Moreover, the glass plate G is wound up with the roll 10 controlled by the drive part (not shown) so that the conveyance speed of the glass plate G and its peripheral speed may become the same speed.

  On the other hand, the interleaf paper 12 is wound around the interleaf paper roll 16, and the interleaf paper 12 drawn out from the interleaf paper roll 16 is sandwiched between the glass plates G and G, and is joined by the frictional resistance. The paper roll 16 is driven and the interleaf paper 12 is supplied between the glass plates G.

  In addition, the slip sheet 12 has a rough surface with a smoothness of 18 seconds or less (JIS P 8119, 1976), the contact area is reduced, and the resin content of the slip sheet 12 is transferred to the glass plate G so that the paper surface is covered with the paper surface. Paper quality that does not cause patterns, burns, dirt, etc. is selected and used.

  In the present invention, it is preferable to use the slip sheet 12 because the pressure applied to the glass plate G is higher than the conventional one. Furthermore, it is preferable that the number of the sticky foreign substances contained in the interleaf paper 12 is as small as possible.

  By the way, in the packaging body of the glass plate G of embodiment, when the glass plate G of thickness T is wound around the roll 10, the radius R of the roll 10 with which the tensile stress σ of the glass plate G is equal to or less than the allowable stress is set. It calculates by Formula 1, and winds and accommodates the glass plate G on the roll 10 of the radius R continuously.

  That is, the package of the embodiment calculates the radius R of the roll 10 that can be wound without damaging the glass plate G by the above formulas 1 to 3, and winds the glass plate G around the roll 10 having the radius R. And accommodate. According to this package, since it is not necessary to cut the glass plate into a size corresponding to the load limit width as in Patent Document 1, a large size glass plate is used while being limited to the load limit width of the transport vehicle. Can be accommodated.

  Here, how to determine the radius R of the roll 10 will be described.

A glass sheet G having a thickness T is wound around the roll 10 having a radius R only once (R >> T). In this case, since the neutral line is the center of the glass plate G, the neutral line length is equal to the length L ₀ = (R + T / 2) 2π of the glass plate G before winding. Then, an outermost biggest tensile stress is applied when the wound, the outermost length L ₁ becomes _{L 1 = (R + T)} · 2π.

Therefore,
Δ = L ₁ −L ₀ = π · T
ε = Δ / L = π · T / ((R + T / 2) 2π)
= (T / 2R) (1 + T / 2R) ^-1
ε = σ / E
E · T / 2R = σ (1 + T / 2R)
E · T = 2R · σ (1 + T / 2R)
= 2R · σ + σ · T
σ = E · T / (2R + T)
R = T (E−σ) / 2σ
It becomes.

  In short, the radius R is proportional to the thickness T and Young's modulus E, and inversely proportional to the maximum allowable tensile stress (σmax).

〔Example〕
Tables 1 and 2 show that a glass plate G (E = 7.55 × 10 ⁴ MPa) having a thickness T of 0.7 mm and 0.5 mm is rolled into a roll 10 having a radius of 600 mm, 700 mm, 800 mm, 900 mm, 1000 mm, and 1200 mm. The tensile stress (σ) of the glass plate G generated when each is wound around is shown.

According to Table 1 above,
When the glass plate G having a thickness T of 0.7 mm is wound around the roll 10 having a radius of 600 mm, σ is 44.9 MPa.
When the glass plate G having a thickness T of 0.7 mm is wound around the roll 10 having a radius of 700 mm, σ is 38.5 MPa.
When the glass plate G having a thickness T of 0.7 mm is wound around the roll 10 having a radius of 800 mm, σ is 33.7 MPa.
When the glass plate G having a thickness T of 0.7 mm is wound around the roll 10 having a radius of 900 mm, σ is 29.9 MPa.
When the glass plate G having a thickness T of 0.7 mm is wound around the roll 10 having a radius of 1000 mm, σ is 26.9 MPa.
When the glass plate G having a thickness T of 0.7 mm is wound around the roll 10 having a radius of 1200 mm, σ is 22.5 MPa.
When the glass sheet G having a thickness T of 0.7 mm is wound around the roll 10 having a radius of 500 mm, σ is 52.8 MPa (comparative example).

On the other hand, according to Table 2,
When the glass plate G having a thickness T of 0.5 mm is wound around the roll 10 having a radius of 600 mm, σ is 32.1 MPa.
When the glass plate G having a thickness T of 0.5 mm is wound around the roll 10 having a radius of 700 mm, σ is 27.5 MPa.
When the glass plate G having a thickness T of 0.5 mm is wound around the roll 10 having a radius of 800 mm, σ is 24.1 MPa.
When the glass plate G having a thickness T of 0.5 mm is wound around the roll 10 having a radius of 900 mm, σ is 21.4 MPa.
When the glass plate G having a thickness T of 0.5 mm is wound around the roll 10 having a radius of 1000 mm, σ is 19.2 MPa.
When the glass plate G having a thickness T of 0.5 mm is wound around the roll 10 having a radius of 1200 mm, σ is 16.0 MPa.
When the glass plate G having a thickness T of 0.5 mm is wound around the roll 10 having a radius of 300 mm, σ is 62.9 MPa (comparative example).

  Here, as shown in the comparative example, if the tensile stress of the glass plate G exceeds 50 MPa, the glass plate G may be damaged during winding around the roll 10, so the maximum value (σmax) of the tensile stress σ. Is preferably set to 50 MPa. It is more preferable to set to 40 MPa, and it is particularly preferable to set to 30 MPa.

Therefore, in the case of a glass plate G having a thickness T of 0.7 mm (E = 7.55 × 10 ⁴ MPa), if the roll 10 has a radius R of 600 mm or more, the glass plate G is not damaged. The roll 10 can be safely wound.

Further, in the case of a glass plate G having a thickness T of 0.5 mm (E = 7.55 × 10 ⁴ MPa), if the roll 10 has a radius R of 380 mm or more, the glass plate G is not damaged. The roll 10 can be safely wound.

Here is a simple example:
T = 0.5mm
σ = 50 MPa
E = 7.55 × 10 ⁴ MPa
R = 1000mm
Interleaf thickness t _p = 0.3 mm
In such a case, the glass plate G can be wound around the roll 10 until the diameter of the entire roll 10 reaches 2380 mm (loading limit width of the transportation vehicle).

  In this case, the upper limit of the width of the glass plate G can be set to the length of the loading platform of the transportation vehicle, and the glass plate G is wound around the roll 10 by about 240 turns. The length is about 1400m. Therefore, if the length of the loading platform of the transport vehicle is 5 m, a large glass plate G having a size of 5 m × 1400 m can be wound around the roll 10 and stored.

  Therefore, according to the packaging body of the glass plate G of the embodiment, it is possible to accommodate a large size glass plate G and to increase the storage efficiency of the glass plate G in a situation where it is limited to the loading limit width of the transport vehicle. it can. In addition, if the length of the glass plate G is 500 m or more, the storage efficiency of the glass plate G will improve.

  FIG. 2 is a schematic view showing a method for conveying a glass plate according to the present invention. The cross section of the truck for land transport is shown, and in this figure, the packing body 20 is loaded in the position where the roll 10 is perpendicular to the traveling method of the truck. Unlike this, the packing body 20 can also be loaded so that the side surfaces of the roll 10 and the glass sheet G after being wound are substantially parallel to the traveling direction. Further, a plurality of sets of packing bodies can be accommodated and transported in one truck.

  In the transport method of the present invention, since the glass plates G are accommodated at a higher density than in the prior art, the accommodation efficiency is increased in a predetermined volume space. Further, when packing is performed with appropriate interleaving paper 12 interposed therebetween, there is an effect that the sheet is resistant to deviation and backlash during conveyance and hardly causes wrinkles on the surface.

  FIG. 3 is a schematic view in which a glass plate G is wound in an elliptical shape along an elliptical roll (cylindrical body) 30.

  The curvature radius R1 on the major axis L1 side of the roll 30 corresponds to the radius R of the roll 10 described above. The glass plate G is wound around the roll 30 from a position P on the extension of the minor axis L2, which is the position having the largest curvature radius. When the edge of the glass plate G is cut by a cutting device, defects such as burrs are present. When such a glass plate is directly wound around the roll 10 having a radius R, the defects are caused by the defects. The glass plate G may be damaged. On the other hand, when the glass plate G is wound from the position P of the elliptical roll 30, the radius of curvature at that position is larger than the radius R, so that no excessive force is applied to the edge of the glass plate G. Further, it is possible to prevent the glass plate G from being broken during winding. In this case as well, the glass sheet G is wound around the roll 30 with interleaving paper interposed.

  Although the glass plate G was illustrated as an example of use of the present invention, the packaging body of the present invention is applied not only to the glass plate G but also to a plate-like body such as a resin plate or a metal plate as long as it is a plate-like body that can be bent. can do.

  Considering that a large and thin plate can be transported stably and efficiently, it is particularly effective for a thin plate type glass plate that is produced by taking multiple pieces from a large size.

  For example, it can be used for a glass substrate of an LCD or an organic EL element (for lighting use or display). Moreover, it can also use for the board | substrate for solar cells as uses other than a display.

  G ... Glass plate, 10 ... Roll, 12 ... Interleaf, 14 ... Winding device, 16 ... Interleaf roll, 20 ... Packing body, 30 ... Elliptical roll

Claims (7)

A glass plate having a thickness T (mm) is wound around a cylindrical body having a radius R (mm), the Young's modulus of the glass plate is E (MPa), and the maximum allowable tensile stress of the glass plate is σmax (MPa ), In the method for transporting the package of glass plates satisfying the following formula 1, formula 2 and formula 3,
The packaging body of the glass plate is accommodated and transported inside the transportation means, and the cylindrical body of the packaging body of the glass plate and the side surface portion after winding of the glass plate are perpendicular to the traveling direction of the transportation means. Or, the packaging body of the glass plate is loaded on the transportation means in a parallel position, the cylindrical body is elliptical, and the radius of curvature on the major axis side of the cylindrical body is set to the R, On the other hand, the glass plate was wound from the position on the extension of the short diameter, and the method for transporting the glass plate package.
R ≧ T · E / 2σmax (1)
0.15 ≦ T ≦ 0.7 mm (2)
σmax = 50 MPa (3)   It is T <= 0.3mm, The conveyance method of the package of the glass plate of Claim 1.   The method for transporting a package of glass plates according to claim 1 or 2, wherein a length L in the longitudinal direction of the glass plate when the glass plate wound around the cylindrical body is extended is 500 m or more.   The method for transporting a package of glass plates according to claim 1, 2 or 3, wherein a width W of the glass plate in the axial direction of the cylindrical body is 0.3 m or more.   The method for transporting a glass plate package according to claim 1, 2, 3, or 4, wherein the glass plate is alkali-free glass.   The conveyance method of the package of the glass plate of any one of Claims 1-5 by which a slip sheet is interposed between the glass plates wound around the said cylindrical body. A glass plate having a thickness T (mm) is wound around a cylindrical body having a radius R (mm), the Young's modulus of the glass plate is E (MPa), and the maximum allowable tensile stress of the glass plate is σmax (MPa ), A glass plate package satisfying the following formula 1, formula 2 and formula 3,
The cylindrical body has an elliptical shape, the radius of curvature on the major axis side of the cylindrical body is set to R, and a glass plate is wound around the cylindrical body from a position on the extension of the minor axis. Package of glass plate.
R ≧ T · E / 2σmax (1)
0.15 ≦ T ≦ 0.7 mm (2)
σmax = 50 MPa (3)

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