JP2014080203A - Packing method packing container of glass roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress an influence by humidity when a glass roll is stored.SOLUTION: In a packing container 20, a storage chamber 24 is sealed by a lid member 26 after a glass roll 10 is inserted, and humidity of the storage chamber 24 is adjusted to a dry state. A valve 40 for exhaustion, and a valve 90 for supplying dry gas are attached to a left side surface of a box body 22. When the air in the storage chamber 24 of the packing container 20 is replaced with the dry gas by valve opening of the valve 40 for exhaustion and the valve 90 for supplying dry gas, and pressure of the storage chamber 24 is adjusted to pressure equal to or more than air pressure, the inside of the packing container 20 is adjusted to humidity equal to or less than 10%, preferably equal to or less than 1%. A minimum winding diameter R of the glass roll 10 can be made smaller by keeping the storage chamber 24 of the packing container 20 at a dry state.

Description

  The present invention relates to a glass roll packaging method and a packaging container.

  2. Description of the Related Art In recent years, a glass roll manufacturing method has been developed in which a thin glass film used for a liquid crystal display or the like is wound around a cylindrical core material to form a glass roll (see, for example, Patent Document 1). Moreover, as a conventional glass roll packaging method, there is a glass roll packaging method in which both ends of the core material of the glass roll are held and the glass roll is housed in a packaging container (for example, see Patent Document 2).

  In the manufacturing method of the glass roll which winds up a glass film on a core material, compressive stress acts on the inner surface of the wound glass film, and tensile stress acts on the outer surface of the glass film. Further, it is known that glass is weak in strength against tensile stress. Therefore, in the conventional method for producing a glass roll, as described in Patent Document 1, the relationship between the bending strength, thickness, and Young's modulus obtained by the three-point bending test method for glass film is satisfied. The minimum winding radius of the glass film was set in And a glass roll is accommodated in the inside of a packaging container as described in the said patent document 2, and the glass film is conveyed in the state hold | maintained so that it may not contact the inner side and lid | cover of a packaging container.

JP 2010-132349 A JP 2011-126666 A

  In a glass roll, when the glass film in a state in which tensile stress is applied is stored for a long time with atmospheric humidity (water vapor) in contact with or attached thereto, a stress corrosion phenomenon is caused by a chemical reaction between the glass film and water molecules. This phenomenon causes delayed fracture in the glass film. Therefore, for example, when the glass roll is stored for a long time in a humid atmosphere, there is a problem that the glass film rolled around the outer periphery of the core material is easily broken by water vapor contained in the atmosphere.

  Then, in view of the said situation, this invention aims at provision of the packing method and packing container of the glass roll which solved the said subject.

  In order to solve the above problems, the present invention has the following means.

The present invention is a method for packing a glass roll in which a glass film is wound around a cylindrical core material,
A procedure for storing the glass roll inside a packaging container;
Fixing the core material inside the packaging container;
And adjusting the humidity inside the packaging container so that the inside of the packaging container is in a dry state with the packaging container sealed.

  According to the present invention, by adjusting the humidity so that the inside of the packaging container is in a dry state in a state where the glass roll is housed inside the packaging container, the glass film rolled in the outer periphery of the core material is in the air. It is possible to prevent moisture from contacting or adhering, and even when the glass roll is stored for a long period of time, the inside of the packaging container is kept in a dry state with low humidity, thereby preventing breakage of the roll-wrapped glass film.

It is a disassembled perspective view which shows embodiment of the packaging container of the glass roll by this invention. It is a longitudinal cross-sectional view which shows the structure of the sealed packaging container. It is a longitudinal cross-sectional view which shows the fixing structure of the glass roll accommodated in the inside of a packaging container. It is a side view of a packing container. It is a figure which shows the procedure of the packaging method of a glass roll. It is a figure which shows the procedure of the modification 1 of the packaging method of a glass roll. It is a figure which shows the procedure of the modification 2 of the packaging method of a glass roll.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

[Packaging container structure]
FIG. 1 is an exploded perspective view showing an embodiment of a glass roll packaging container according to the present invention. As shown in FIG. 1, the glass roll 10 is stored in a storage chamber 24 formed inside the box 22 of the packaging container 20. After the glass roll 10 is inserted into the internal storage chamber 24, the packaging container 20 is sealed with the lid member 26, and the humidity of the storage chamber 24 is lowered so that the humidity of the storage chamber 24 becomes dry as will be described later. Adjusted.

  In the glass roll 10, a band-shaped glass film 14 is wound around the outer periphery of a cylindrical core material 12, and both end portions 12 a and 12 b of the core material 12 protrude in the axial direction from both lateral end portions of the glass film 14. It is formed as follows. Moreover, the minimum radius of the glass roll 10 is prescribed | regulated by the outer diameter of the core material 12, and is determined from the relationship with humidity with the calculation formula mentioned later. The total length of the core material 12 in the axial direction is determined according to the width dimension of the glass film 14, and is formed such that both end portions 12 a and 12 b have a length that can be held inside the packaging container 20.

  Although the material of the glass film 14 is not specifically limited, For example, it is preferable that they are soda-lime silicate glass, aluminosilicate glass, borosilicate glass, aluminoborosilicate glass, and are alkali-free aluminosilicate glass and aluminoborosilicate glass. It is more preferable.

  Although the size of the glass film 14 is not specifically limited, For example, it is preferable that width is 300 mm-1600 mm, length is 1000 mm or more, and plate | board thickness is 0.1 mm or less.

  In order to prevent the glass film 14 from being damaged, the glass film 14 may be wound around the core material 12 while a buffer material made of a resin such as polyethylene terephthalate (PET) is inserted between the glass films 14.

The relationship between the minimum winding diameter of the glass roll 10 (the outer diameter of the core material 12) and the humidity of the storage chamber 24 of the packaging container 20 is set by the following equation (1).
R ≧ (T / 2) [{3E / σ ₋₃₅ (1-υ ² ) (1-0.2 log (H / 100))} − 1] (1)
In the above formula (1), R is the minimum winding diameter (mm), T is the thickness of the glass film (mm), E is the Young's modulus (GPa), υ is the Poisson's ratio, σ ₋₃₅ is the water vapor dew point −35 ° C. The breaking strength (GPa) and H are relative humidity (%) at an ambient temperature of 23 ° C.

  From the above formula (1), when the water vapor concentration in the atmosphere of the storage chamber 24 is high, the minimum winding diameter R of the glass roll 10 is increased correspondingly, and conversely, the water vapor concentration in the atmosphere of the storage chamber 24 is low. In this case, the minimum winding diameter R of the glass roll 10 can be reduced accordingly. That is, by keeping the humidity of the storage chamber 24 of the packaging container 20 in a dry state that is almost zero, the minimum roll diameter R of the glass roll 10 can be made smaller, and thus the packaging container 20 can be reduced in size and saved. Space can be achieved.

  Moreover, when the minimum roll diameter of the glass roll 10 having a plate thickness of 0.1 mm is set to 220 mm and the glass roll 10 is stored for one month in an atmosphere of 60% humidity, one glass film 14 out of the ten glass rolls 10 is formed. Cracking occurred. In contrast, when the glass roll 10 having the same minimum winding diameter was stored for one month in an atmosphere with a humidity of 0.1%, no cracks occurred in the glass film 14 in all ten glass rolls 10. From this experimental result, it can be seen that the glass roll 10 is affected by humidity when stored for a long period of time.

  The above equation (1) is derived as follows.

  The strength of the glass film 14 varies depending on the crack length of the scratch on the glass surface, but the crack growth rate depends on the tensile stress applied to the glass surface. If the scratch formed on the surface of the glass film 14 is deep, a large force is generated at the tip of the scratch due to the stress concentration when a tensile stress is applied. In general, the magnitude of the stress generated on the surface of the glass film 14 is expressed by a stress intensity factor. The critical value of the stress intensity factor that causes the glass to break is called the critical stress intensity factor, or the fracture toughness value. When the stress intensity factor exceeds the fracture toughness value, scratches on the surface of the glass film 14 rapidly develop. That is, the glass film 14 is immediately cracked when a tensile stress equal to or greater than the fracture stress is applied to the surface of the glass film 14 because the stress intensity factor reaches near the fracture toughness value. Even if the stress intensity factor does not reach the fracture toughness value, the cracks gradually develop and lead to fracture. This phenomenon is called fatigue or delayed fracture, and the growth rate of cracks increases as the water vapor concentration increases. Therefore, the strength of the glass film 14 depends on the water vapor concentration of the atmosphere, and when the water vapor concentration increases, the strength decreases substantially in proportion to the logarithm of the water vapor partial pressure.

  However, it is known that when the stress intensity factor falls below a certain value, cracks do not progress. This phenomenon is called the fatigue limit. Therefore, if the tensile stress on the surface of the glass film 14 is reduced so that the stress intensity factor is below the fatigue limit, delayed fracture does not occur. Since the fatigue limit depends on the water vapor concentration, even if a tensile stress exists on the glass surface, if the water vapor concentration is controlled so as to reach the fatigue limit, delayed fracture does not occur.

On the other hand, the tensile stress σ generated on the surface of the glass film 14 generated when the glass film 14 having a thickness T (mm), Young's modulus E (GPa), and Poisson's ratio υ is wound around a rod having a radius R (mm) is And the following equation.
σ = ET / [2 (1-υ ² ) {R + (T / 2)}] (2)
Therefore, if the stress intensity factor based on the tensile stress σ generated on the surface of the glass film 14 when the glass film 14 is wound around the outer periphery of the core material 12 is below the fatigue limit, delayed fracture does not occur.

Based on the above knowledge, the above formula (1) is based on the assumption that the fracture strength σ ₋₃₅ at a water vapor dew point of −35 ° C. is a stress intensity factor corresponding to the fracture toughness value, and the relative humidity at a temperature of 23 ° C. It is obtained by estimating the fatigue limit in H (%).

  On the other hand, it is known that the glass breaking phenomenon shows statistical variation. Therefore, even if the fracture strength is considered to be similar because the manufacturing process is the same, there is a variation in strength, and fatigue fracture may occur due to lower stress. Therefore, an equation that incorporates a certain safety factor can be considered.

Specifically, the relationship between the minimum winding diameter of the glass roll 10 (the outer diameter of the core material 12) and the humidity of the storage chamber 24 of the packaging container 20 is preferably set by the following equation (3).
R ≧ (T / 2) [{3E / σ ₋₃₅ (1-υ ² ) (1-0.18 log (H / 100))} − 1] (3)
Further, the relationship between the minimum winding diameter of the glass roll 10 (the outer diameter of the core material 12) and the humidity of the storage chamber 24 of the packaging container 20 is more preferably set by the following equation (4).
R ≧ (T / 2) [{3E / σ ₋₃₅ (1-υ ² ) (1-0.11 log (H / 100))} − 1] (4)
The above formulas (3) and (4) incorporate the desired safety factor into the above-described formula (2), so that the set value of the minimum winding diameter of the glass roll 10 becomes an appropriate value corresponding to the humidity at the storage location. It is possible to set. The value of the safety factor is a value that is arbitrarily adjusted according to the environment of the storage location of the glass roll 10. For example, when the glass roll 10 is stored at the delivery destination for a long time, A value corresponding to conditions such as humidity or humidity in a storage facility (a warehouse or a container) is selected.

  The packaging container 20 is formed of a metal plate such as a galvanized steel plate or stainless steel, and has a configuration in which the upper end opening of the box 22 is sealed with a lid member 26. In the packing container 20, fastening fasteners 30 are attached to a plurality of locations on the front and rear wall surfaces 22 b of the box body 22, and the fastener 30 is engaged with the front and rear wall surfaces 26 b of the lid member 26. A joint member 32 is attached. Each of the plurality of fasteners 30 has a fitting that engages with the engaging member 32, and is fastened in a sealed state in which the lid member 26 is pressed against the box body 22.

  An exhaust valve 40, a pressure gauge 50, and a hygrometer 60 are attached to the left wall surface 22 c of the box body 22. The exhaust valve 40 is opened when the air in the storage chamber 24 is exhausted in a dry gas replacement operation described later, and is closed at other times. The pressure gauge 50 measures the internal pressure of the storage chamber 24 when the glass roll 10 is stored, and displays the measured pressure value. The hygrometer 60 measures the humidity of the storage chamber 24 when the glass roll 10 is stored, and displays the measured humidity value.

  FIG. 2 is a longitudinal sectional view showing the structure of the sealed packaging container. FIG. 3 is a longitudinal sectional view showing a fixing structure of a glass roll housed in the packing container. As shown in FIGS. 2 and 3, a U-shaped groove 26 a into which the upper edge 22 a of the box body 22 is fitted is formed at the inner peripheral edge of the lid member 26, and the groove 26 a is formed inside the groove 26 a. The seal member 70 is inserted. Therefore, the cover member 26 is put on the upper edge portion 22 a of the lid body 22, and the engagement portions of the plurality of fasteners 30 are engaged with the engagement members 32 to be fastened, whereby the seal member 70 is secured to the box body 22. Is maintained in an airtight state in close contact with the upper edge portion 22a.

  In addition, a pair of mounting tables 80 on which outer peripheries of both end portions 12 a and 12 b of the core member 12 of the glass roll 10 are mounted are provided at the bottom of the box 22. The pair of mounting tables 80 includes a mounting portion 82 having an arc-shaped concave curved surface corresponding to the outer diameter of the core material 12 on the upper surface, and a fixing band 84 that fixes the outer periphery of both end portions 12a and 12b of the core material 12. Have. The fixed band 84 is composed of a pair of metal bands 84a and 84b such as stainless steel, both ends are connected to the mounting portion 82, and the center portion is adjusted by adjusting the circumferential length of the metal bands 84a and 84b. An adjusting mechanism 84c for adjusting the pressing force on the upper outer periphery of the material 12 is provided. The glass roll 10 is fixed in a stable state by the pressing force of the fixing band 84 in a state where the outer circumferences of both end portions 12 a and 12 b of the core member 12 are placed on the placement portion 82 of the placement table 80. Therefore, even if vibration or impact during transportation is transmitted to the packaging container 20, the glass roll 10 fixed in the storage chamber 24 is prevented from rattling and is protected from vibration or impact during transportation.

  A wall 22d on the right side of the box 22 is provided with a dry gas supply valve 90 that serves as a dry gas introduction side when air is replaced with dry gas (air or nitrogen having a humidity of 0%). The dry gas supply valve 90 is opened when the dry gas is introduced into the storage chamber 24 of the packaging container 20, and is closed at other times.

  FIG. 4 is a side view of the packaging container 20. As shown in FIG. 4, the packing container 20 has an exhaust valve 40, a pressure gauge 50, and a hygrometer 60 attached to the left wall surface 22 c of the box body 22. Therefore, when the dry gas replacement operation is performed by opening the exhaust valve 40 and the dry gas supply valve 90 (see FIG. 2) as described later, the pressure and humidity changes in the storage chamber 24 of the packaging container 20 are changed. Can be confirmed from outside.

[Procedure for packing method of glass roll 10]
In the present embodiment, the glass roll 10 is packed in the packing container 20 by the following procedure 1 to procedure 6. In addition, FIG. 5 is a figure which shows the procedure of the packaging method of the glass roll 10. As shown in FIG.

  (Procedure 1) As shown in FIG. 5A, the glass roll 10 is moved above the upper opening of the box 22 of the packing container 20, and the glass roll 10 is stored in the storage chamber of the box 22 as indicated by an arrow. Lower to 24. The glass film 14 of the glass roll 10 is wound around the outer periphery of the core material 12 set so that the relationship between the minimum winding diameter and the humidity satisfies the condition of the above-described formula (1).

  (Procedure 2) As shown in FIG. 5B, the outer circumferences of both end portions 12a and 12b of the core member 12 are placed on the placement portion 82 of the placement table 80. Since the mounting portion 82 of the mounting table 80 is formed in an arcuate concave curved surface, the outer circumferences of both end portions 12a and 12b of the core member 12 abut against the mounting portion 82, and the core member 12 is mounted on the mounting portion 82. 82 is supported in a stable state.

  (Procedure 3) As shown in FIG. 5C, the fixing band 84 of the mounting table 80 is wound around the outer circumferences of both end portions 12a and 12b of the core member 12 of the glass roll 10, and the length of the fixing band 84 is adjusted. The glass roll 10 is fixed in a stable state without rattling. In this housed state, the glass roll 10 is housed in the glass film 14 in a state where it does not contact the box 22 and the lid member 26.

  (Procedure 4) As shown in FIG. 5D, the upper opening of the box 22 in which the glass roll 10 is housed is closed with a lid member 26. As described above, the engaging portion of each fastener 30 is engaged with the engaging member 32 and fastened. Thereby, the space between the upper edge 22 a of the box 22 and the lid member 26 is kept airtight by the seal member 70.

  (Procedure 5) As shown in FIG. 5E, the dry gas supply tube 102 of the dry gas generator 100 is connected to the dry gas supply valve 90 of the packaging container 20. The dry gas generator 100 stores, for example, nitrogen gas at a predetermined pressure or dry gas obtained by drying air, the dry gas supply valve 90 is opened, and the compressed dry gas is stored in the storage chamber 24. Supplied. That is, the exhaust valve 40, the dry gas supply valve 90, and the dry gas generator 100 constitute a humidity adjusting unit and a replacement unit.

  When the measured value of the pressure gauge 50 rises to a predetermined pressure, the exhaust valve 40 is opened, and the air in the storage chamber 24 is exhausted to the outside as indicated by an arrow. Then, gas replacement is performed until the measured value of the hygrometer 60 becomes 10% or less, preferably 1% or less.

  Therefore, when the humidity of the sealed storage chamber 24 is adjusted to 10% or less, preferably 1% or less, the exhaust valve 40 is closed, and the pressure in the storage chamber 24 is equal to or higher than atmospheric pressure, preferably atmospheric pressure. When the pressure exceeds the predetermined pressure, the dry gas supply valve 90 is closed. Then, the dry gas supply tube 102 is removed from the dry gas supply valve 90 of the packaging container 20.

  (Procedure 6) As shown in FIG. 5F, when the air in the storage chamber 24 of the packaging container 20 is replaced with dry gas and the pressure in the storage chamber 25 is adjusted to a pressure equal to or higher than atmospheric pressure, the humidity Adjustment work is completed. Further, since the packaging container 20 has a hermetically sealed structure, the humidity is maintained at 10% or less, preferably 1% or less even after the humidity is adjusted as described above. Further, when air leaks from the seal member 70 due to vibration during transportation, the pressure in the storage chamber 24 is increased to atmospheric pressure or higher, so that the dry gas in the storage chamber 24 leaks to the outside. Therefore, the outside air with high humidity is prevented from entering the storage chamber 24. Therefore, even if the glass roll 10 is stored in the packaging container 20 for a long period of time, the glass roll 10 is wound around the core material 12 because it is placed in an atmosphere with low humidity (at least 10% or less humidity). The glass film 14 is prevented from being damaged by humidity (water vapor).

  Further, even when the packaging container 20 is placed in a high humidity atmosphere, the glass roll 10 accommodated in the packaging container 20 is protected from the stress corrosion phenomenon due to humidity, so that it can withstand storage in a high humidity area, for example. It is done.

  Further, when the internal pressure drops to atmospheric pressure while the packaging container 20 is being transported or stored in a warehouse, dry gas may be replenished from the dry gas supply valve 90. In that case, if the packing container 20 is equipped with a portable small gas cylinder (not shown) in which the compressed dry gas is sealed, the dry gas can be replenished at any time.

[Procedure of Modification Example 1 of Glass Roll Packing Method]
In the first modification, the glass roll 10 is packed in the packing container 20 by the following procedure 1a to procedure 6a. In addition, FIG. 6 is a figure which shows the procedure of the modification 1 of the packaging method of a glass roll.

  (Procedure 1a) As shown in FIG. 6A, a desiccant (adsorbing means) 120 is inserted into the hollow portion of the core 12 of the glass roll 10. The desiccant 120 forms a humidity control unit, is made of silica gel having hygroscopicity, and is filled in a bag having air permeability. Subsequently, the glass roll 10 is moved above the upper opening of the box body 22 of the packaging container 20, and the glass roll 10 is lowered into the storage chamber 24 of the box body 22 as indicated by an arrow. The glass film 14 of the glass roll 10 is wound around the outer periphery of the core material 12 so that the relationship between the minimum winding diameter and the humidity satisfies the condition of the above-described formula (1).

  (Procedure 2a) to (Procedure 4a) are the same as Procedure 2 to Procedure 4 described above, as shown in FIG. 6 (B) to FIG.

  (Procedure 5a) As shown in FIG. 6E, the dry gas supply tube 102 of the dry gas generator 100 is connected to the dry gas supply valve 90 of the packing container 20, and the exhaust tube 132 of the vacuum pump 130 is exhausted. Connect to the valve 40. Subsequently, the exhaust valve 40 is opened and the vacuum pump 130 is activated. Thereby, as shown by the arrow, the air in the storage chamber 24 of the packaging container 20 is forcibly exhausted, and the pressure is reduced to atmospheric pressure or less, preferably less than atmospheric pressure.

  Next, the dry gas supply valve 90 is opened, and the dry gas generated by the dry gas generator 100 is supplied to the storage chamber 24. That is, the vacuum pump 130, the exhaust valve 40, the dry gas supply valve 90, and the dry gas generator 100 constitute a humidity adjusting unit and a replacement unit.

  Since the air in the storage chamber 24 of the packaging container 20 is forcibly exhausted by the vacuum pump 130, the air in the storage chamber 24 is discharged and replaced with dry gas in a short time. Then, gas replacement is performed until the measured value of the hygrometer 60 becomes 10% or less, preferably 1% or less. When the air in the storage chamber 24 is replaced with dry gas, the operation of the vacuum pump 130 is stopped and the exhaust valve 40 is closed.

  Subsequently, the dry gas supply valve 90 is closed when the pressure in the storage chamber 24 reaches a predetermined pressure that is equal to or higher than atmospheric pressure, and preferably higher than atmospheric pressure. Then, the dry gas supply tube 102 is removed from the dry gas supply valve 90 of the packing container 20, and the exhaust tube 132 is removed from the exhaust valve 40.

  (Procedure 6a) As shown in FIG. 6F, when the air in the storage chamber 24 of the packing container 20 is replaced with dry gas and the pressure in the storage chamber 25 is adjusted to a pressure higher than atmospheric pressure, the humidity Adjustment work is completed. Further, since the packing container 20 has a hermetically sealed structure, the humidity is kept at 10% or less, preferably 1% or less even after the humidity adjustment. Also in the first modification, when air leaks from the seal member 70 due to vibration during transportation, the pressure in the storage chamber 24 is increased to the atmospheric pressure or higher, so the dry gas in the storage chamber 24 Leaking outside prevents the outside air with high humidity from entering the storage chamber 24. Therefore, even if the glass roll 10 is stored in the packaging container 20 for a long period of time, the glass roll 10 is wound around the core material 12 because it is placed in an atmosphere with low humidity (at least 10% or less humidity). The glass film 14 is prevented from being damaged by humidity (water vapor).

  Furthermore, when the amount of air leakage increases due to damage to the seal member 70 and the outside air enters the storage chamber 24, the humidity of the storage chamber 24 increases. However, since the desiccant 120 is filled in the hollow part of the core material 12 of the glass roll 10, in the storage chamber 24, the moisture is absorbed by the desiccant 120 and a low humidity atmosphere (at least 10% or less) is maintained. The Therefore, even when the packaging container 20 is placed in a high humidity atmosphere with the seal member 70 deteriorated, the glass roll 10 stored in the packaging container 20 is protected from the stress corrosion phenomenon due to humidity. It can withstand storage in high areas.

  In the first modification, the gas replacement operation by the vacuum pump 130 and the desiccant 120 may be combined, or only one of them may be used.

[Procedure of Modification 2 of Glass Roll Packaging Method]
In the modification 2, the glass roll 10 is packed in the packing container 20 by the following procedures 1b to 6b. In addition, FIG. 7 is a figure which shows the procedure of the modification 2 of the packaging method of a glass roll.

  Since (Procedure 1b) to (Procedure 3b) are the same as Procedure 1a to Procedure 3a described above, as shown in FIGS. In the second modification, the glass film 14 of the glass roll 10 is wound around the outer periphery of the core material 12 so that the relationship between the minimum winding diameter and the humidity satisfies the condition of the above-described formula (1).

  (Procedure 4b) As shown in FIG. 7D, the dry gas supply tube 102 of the dry gas generator 100 is connected to the dry gas supply valve 90 of the packaging container 20. Subsequently, the exhaust valve 40 and the dry gas supply valve 90 are opened, and the dry gas generated by the dry gas generator 100 is heated by the hot air heater (heating means) 150 and supplied to the storage chamber 24. The

  Further, warm air of dry gas heated by the warm air heater 150 is supplied to the storage chamber 24 inside the packaging container 20 for a predetermined time. The dry gas is heated to a high temperature (for example, about 260 ° C. when PET is used as a buffer material) when passing through the hot air heater 150. In addition, the heating temperature by the warm air heater 150 is below the heat resistance temperature of each interior member which forms the storage chamber 24 of the packing container 20, a buffer material, the core material 12 accommodated in the storage chamber 24, the glass film 14, etc. In addition, it is desirable that the temperature be higher than the boiling point of water (100 ° C. or higher). Moreover, the supply time of warm air is set according to warm air temperature, for example, shall be 30 to 600 seconds.

  Thus, the inside of the packaging container 20 is heated by the warm air of the dry gas, so that the temperature of the storage chamber 24 rises in a short time, and water droplets attached to the inside of the storage chamber 24 and the glass roll 10 evaporate. It becomes water vapor. For this reason, air (including water vapor evaporated by heating) in the storage chamber 24 of the packaging container 20 is exhausted into the atmosphere from the exhaust valve 40 as indicated by an arrow. Thus, the air in the storage chamber 24 is efficiently replaced with dry gas.

  When the measured value of the hygrometer 60 is 10% or less, preferably 1% or less, the exhaust valve 40 is closed.

  Subsequently, the dry gas supply valve 90 is closed when the pressure in the storage chamber 24 reaches a predetermined pressure that is equal to or higher than atmospheric pressure, and preferably higher than atmospheric pressure. Then, the dry gas supply tube 102 is removed from the dry gas supply valve 90 of the packaging container 20.

  (Procedure 5b) As shown in FIG. 7E, the air in the storage chamber 24 of the packaging container 20 is replaced with dry gas, and the pressure in the storage chamber 25 is equal to or higher than atmospheric pressure, preferably higher than atmospheric pressure. When the adjustment is completed, the humidity adjustment operation is completed. Further, since the inside of the packaging container 20 has an airtight structure, the humidity is kept at 10% or less, preferably 1% or less. Further, when air leaks from the seal member 70 due to vibration during transportation, the pressure in the storage chamber 24 is increased to atmospheric pressure or higher, so that the dry gas in the storage chamber 24 leaks to the outside. Therefore, the outside air with high humidity is prevented from entering the storage chamber 24. Therefore, even if the glass roll 10 is stored in the packaging container 20 for a long period of time, the glass roll 10 is wound around the core material 12 because it is placed in an atmosphere with low humidity (at least 10% or less humidity). The glass film 14 is prevented from being damaged by humidity (water vapor).

  Further, when air leaks from the seal member 70 and outside air enters the storage chamber 24, the humidity of the storage chamber 24 increases. However, since the desiccant 120 is filled in the hollow portion of the core material 12 of the glass roll 10, the storage chamber 24 is maintained in an atmosphere of low humidity (at least 10% or less) due to moisture absorbed by the desiccant 120. It becomes possible. Therefore, even when the packaging container 20 is placed in a high humidity atmosphere with the seal member 70 deteriorated, the glass roll 10 stored in the packaging container 20 is protected from the stress corrosion phenomenon due to humidity. It can withstand storage in high tropical and subtropical areas.

  In the second modification, the heat treatment by the hot air heater 150, the gas replacement operation, and the desiccant 120 may be combined, or only one of them may be used.

DESCRIPTION OF SYMBOLS 10 Glass roll 12 Core material 12a, 12b End part 14 Glass film 20 Packing container 22 Box 22a Upper edge part 22b, 22c, 22d Wall surface 24 Storage chamber 26 Lid member 30 Fastener 32 Engagement member 40 Exhaust valve 50 Pressure gauge 60 Hygrometer 70 Sealing member 80 Mounting base 82 Mounting portion 84 Fixed bands 84a, 84b Metal band 84c Adjustment mechanism 90 Dry gas supply valve 100 Dry gas generator 102 Dry gas supply tube 120 Desiccant 130 Vacuum pump 132 Exhaust tube 150 Hot air heater

Claims (12)

A glass roll packaging method in which a glass film is wound around a cylindrical core material,
A procedure for storing the glass roll inside a packaging container;
Fixing the core material inside the packaging container;
A procedure for adjusting the humidity inside the packaging container so that the inside of the packaging container is in a dry state with the packaging container sealed,
A method for packing a glass roll, comprising:   The packaging container has a humidity adjustment unit that adjusts an internal humidity in a state where the glass roll is housed therein, and the humidity adjustment unit adjusts the internal humidity to an arbitrary humidity. The packaging method of the glass roll of Claim 1 to do.   The glass roll packing method according to claim 1, wherein the humidity inside the packing container is adjusted to 10% or less.   The glass roll packing method according to claim 1 or 2, wherein the humidity inside the packing container is adjusted to 1% or less. R is the minimum winding diameter (mm), T is the thickness of the glass film (mm), E is the Young's modulus (GPa), υ is the Poisson's ratio, σ ₋₃₅ is the breaking strength (GPa) at a water vapor dew point of −35 ° C. , H is the relative humidity (%) at 23 ° C. of the atmosphere during storage, the minimum winding diameter R of the glass roll and the humidity H inside the packaging container are:
R ≧ (T / 2) [{3E / σ ₋₃₅ (1-υ ² ) (1-0.2 log (H / 100))} − 1]
The glass roll packing method according to claim 1, wherein the glass roll packaging method is set according to the relationship of the above formula. A glass roll packaging container in which a glass film is wound around a cylindrical core material,
A box in which a storage chamber in which the glass roll is stored is formed;
A lid member attached to the opening of the box and sealing the storage chamber;
A humidity adjusting unit for adjusting the humidity of the storage room;
Have
The glass container is characterized in that the storage chamber is adjusted to a dry state by the humidity adjusting unit after the glass roll is stored.   The said humidity adjustment part adjusts the humidity of the said storage chamber to 10% or less, The packaging container of the glass roll of Claim 6 characterized by the above-mentioned.   The said humidity adjustment part adjusts the humidity of the said storage chamber to 1% or less, The packaging container of the glass roll of Claim 6 characterized by the above-mentioned. R is the minimum winding diameter (mm), T is the thickness of the glass film (mm), E is the Young's modulus (GPa), υ is the Poisson's ratio, σ ₋₃₅ is the breaking strength (GPa) at a water vapor dew point of −35 ° C. , H is the relative humidity (%) at 23 ° C. of the atmosphere during storage, the minimum winding diameter R of the glass roll and the humidity H of the storage chamber are:
R ≧ (T / 2) [{3E / σ ₋₃₅ (1-υ ² ) (1-0.2 log (H / 100))} − 1]
The glass roll packaging container according to any one of claims 6 to 8, wherein the glass roll packaging container is set according to the relationship of the above equation.   The packaging container for a glass roll according to any one of claims 6 to 9, wherein the humidity adjusting unit includes a gas replacement unit that replaces air in the storage chamber with dry gas.   The said humidity adjustment part has an adsorption | suction means to adsorb | suck the water vapor | steam contained in the air of the said storage chamber, The packaging container of the glass roll in any one of Claims 6-10 characterized by the above-mentioned.   The said humidity adjustment part has a heating means to supply the heated air to the said storage chamber, The packaging container of the glass roll in any one of Claims 6-11 characterized by the above-mentioned.

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