TWI700255B - Glass roll and its manufacturing method - Google Patents

Abstract

The glass roll (1) is constituted by winding the composite roll core (4) around the roll core (2) around the expansion absorbing material (3), and winding the glass film (9).

Description

Glass roll and its manufacturing method

The present invention relates to a glass roll with a glass film wound around a core and a manufacturing method thereof, and particularly relates to an improved technology of the peripheral structure of the core.

As is conventionally known, thin display devices such as liquid crystal displays and organic EL displays, and mobile devices such as smartphones and tablet computers, which have been rapidly spreading in recent years, are required to be lightweight. Therefore, as the glass substrate used in these machines, a thin-plate glass film has been put into practical use.

This glass film is formed into a roughly rectangular shape or the like at the stage of the final product, but it is treated as a belt-like shape including stages including various treatment processes of the manufacturing process before the stage of the final product.

This kind of glass film has appropriate flexibility. Therefore, considering the convenience during handling, storage, or transportation, it is generally made into a form of a glass roll wound around the core. If it is made into a glass roll form in this way, not only is the handling of the glass film excellent, but also the efficiency of the work can be achieved even when the glass film is processed in various ways. 化.

As described in Patent Document 1, this glass roll is formed of a core made of metal or the like, or, from the viewpoint of achieving weight reduction, made of thermoplastic resin such as vinyl chloride or the like. In addition, the glass film is wound by applying tension in the required winding direction around the winding core to produce a glass roll.

The glass rolls manufactured in this way are packaged and shipped by a glass manufacturer, etc., and transported over long distances, etc., to machine manufacturers that manufacture the aforementioned various final products.

[Prior technical literature] 〔Patent Literature〕

[Patent Document 1] Japanese Patent Application Publication No. 2015-51912

In addition, when the glass roll is transported, not only the usual temperature changes, but also temperature changes depending on the regional relationship between the peeling manufacturer and the machine manufacturer. Along with this change, the temperature of the glass roll rises, causing the following problems.

That is, the core of the glass roll is formed of a resin such as metal or vinyl chloride as described above, and therefore has the characteristic of being easy to expand in response to temperature rise. On the other hand, the glass film wound around the core has a characteristic that it is difficult to stretch even if the temperature rises.

Therefore, as the temperature rises, the diameter of the core increases In addition, the tensile stress acts on the glass film, and when the tensile stress value becomes excessively large, the glass film may be damaged. The damage of the glass film is not only the inner layer around the core of the glass roll, but also the outer layer.

Therefore, problems such as defective glass rolls manufactured by glass manufacturers and the like become unusable during shipping after shipment. Furthermore, such a problem may be caused when a temperature rise occurs even in the middle of glass roll manufacturing, storage, etc. of a glass manufacturer.

From the above point of view, the subject of the present invention is to effectively avoid the occurrence of damage to the glass film even if the diameter of the core increases as the temperature of the glass roll increases.

The glass roll of the present invention developed to solve the aforementioned problems is characterized in that it is a composite roll core in which an expansion absorbent is wound around the core, and a glass film is wound. Here, "expansion absorption" means to absorb the expansion (increasing in diameter) of the roll core so that the glass film does not follow the expansion and stretches.

According to this structure, even if the temperature of the glass roll increases, the diameter of the core increases. Since the glass film is wound around the outer periphery of the expanded absorbent material, which is a constituent element of the composite core, the diameter of the core increases. The assembly is absorbed by the swelling absorbent material, which will not cause much influence on the glass film. In other words, when the diameter of the roll core increases, even if the glass film does not follow the increase and extends, the expansion absorption function of the expansion absorption material will over The tensile stress of a high degree does not act on the glass film. As a result, damage to the glass film can be effectively avoided, and a good glass roll can be maintained. From such a point of view, as the expansion-absorbing material, it is possible to use a cushioning material or sheet having an expansion-absorbing function, or a shock-absorbing material or sheet having an expansion-absorbing function for the wound glass film. Here, in order to serve as an expansion absorbent material, the characteristic that the compressive stress acting on the member in the radial direction changes due to the change in the diameter of the core according to the temperature change, and the thickness of the member changes by 0.5 mm or more. good.

Specifically, as the expansion absorbing material, a foamed resin sheet is preferable, and a foamed resin sheet having a thickness of 2 mm-7 mm is more preferable.

Thereby, the foamed resin sheet can fully exhibit the expansion and absorption function, and it is possible to appropriately prevent the glass film from being damaged due to the temperature rise of the glass roll. In addition, when the thickness of the foamed resin sheet is 2mm-7mm, the hindrance of the expansion absorption function caused by insufficient thickness can be suppressed, and the excessive level caused by the excessive thickness can also be suppressed. That is, when the thickness of the foamed resin sheet is less than 2 mm, there is a possibility that the expansion and absorption function may not be sufficiently exhibited. In addition, when the thickness of the foamed resin sheet exceeds 7 mm, it becomes an excessive level, resulting in waste of materials. Therefore, if the thickness is within the aforementioned numerical range, it is possible to avoid such a defect.

In addition, the expansion ratio of the foamed resin sheet is preferably 25% to 45%.

Thereby, the foamed resin sheet can fully exhibit the expansion absorption function from the material side. That is, when the expansion ratio of the foamed resin sheet is less than 25%, the flexibility tends to decrease and become too hard. As the diameter of the roll core increases, the glass film also stretches, causing excessive tensile stress. In addition, when the expansion ratio of the foamed resin sheet exceeds 45%, the flexibility will increase and become too soft. Therefore, even before the diameter of the core increases, it will be entangled with the glass film. The tightness may cause the foamed resin sheet to be improperly compressed. Therefore, if the expansion ratio is within the aforementioned numerical range, it is possible to avoid such a defect.

In the above structure, the expansion-absorbent material has a length corresponding to the full length of the outer peripheral surface of the core in the circumferential direction, and is wound around the core in a state where both ends in the circumferential direction are butted.

This prevents the expansion and absorbing material from overlapping in the circumferential direction and forming a step. Therefore, the glass film can be smoothly wound without undue deformation or undue bending stress around the composite core. . Thereby, it is possible to more reliably prevent the glass film from being damaged due to the increase in the diameter of the winding core accompanying the temperature increase.

In the above structure, the glass film may be wound around the composite winding core with the glass film connected to the guide belt.

Thereby, it can be set as the state in which the guide tape was wound around the outer peripheral side of an expansion-absorption material, and the inner peripheral side of a glass film. The inventors of the present invention have found that in this case, even if the glass film is connected to the guide belt, the expansion-absorbent material is not wound around the core. If the temperature of the glass roll rises, there will be production on the glass film. damaged. In addition, the guide belt is not used to perform the expansion absorption function of the expansion of the winding core and is connected to the glass film, but is used to pull the glass film appropriately when the glass film is rolled. Therefore, even in the case where the glass film is connected to the guide belt, if the The swelling absorption function of the swelling absorbent material cannot prevent the glass film from being damaged due to the temperature rise of the glass roll. This means that even if the guide belt is present on the inner layer side of the glass film, the expansion absorbing material existing on the inner layer side of the guide belt needs to further exert the expansion absorption function to prevent the glass film from being damaged.

In this case, the thickness of the swelling absorbent material is preferably 20 to 140 times the thickness of the guide belt.

Thereby, the glass roll will not be enlarged due to the thick guide belt, and the glass film can be prevented from being damaged due to the expansion of the absorbent material. Therefore, if the thickness relationship between the two is in the aforementioned numerical relationship, the expansion-absorbent material can fully perform the expansion and absorption function, and the guide belt can also fully perform its original function, that is, the function of appropriately pulling the glass film.

In the above structure, the glass film may be wound on the composite core in a state of being overlapped on the protective sheet.

This prevents the glass films from contacting each other by the protective sheet, and it is difficult to produce obstacles such as damage to the glass films. The inventors of the present invention have found that in this case, even if the glass film is wound around the core in the state of overlapping the protective sheet, the expansion absorbent is not fixed around the core. If the temperature of the glass roll rises, the glass film will be damaged. In addition, the protective sheet is not superimposed on the glass film for the purpose of expansion and absorption, but is used to prevent the glass film from being damaged and can be appropriately wound around the glass film. Therefore, even when the glass film overlaps the protective sheet, if the expansion absorption function by the expansion absorption material cannot be exerted, the temperature rise of the glass roll cannot be prevented. The damage of the glass film. This means that even if the protective sheet is present on the inner layer side of the glass film, the expansion absorbing material present on the inner layer side of the protective sheet needs to further exert an expansion absorption function to prevent damage to the glass film.

In this case, it is desirable that the thickness of the swelling absorbent material is 20 to 140 times the thickness of the protective sheet.

Thereby, it is possible to prevent the glass roll from being enlarged due to the thick thickness of the protective sheet, and it is possible to appropriately prevent the glass film from being damaged due to the expansion absorbent. Therefore, if the relationship between the thickness of the two is in the aforementioned numerical relationship, the expansion-absorbing material can fully exert its expansion and absorption function, and the protective sheet can also fully exert its original function even if the glass film is not easily damaged and can be Give proper tension function.

In the above structure, it is desirable that both ends in the width direction of the expansion absorbent material protrude from both ends in the width direction of the glass film.

Thereby, the expansion absorbing material exists in the entire width direction of the inner layer side of the glass film, so a stable wound state can be obtained, and the glass film can exhibit an equal expansion absorption effect over the entire width direction.

In addition, it is desirable that both ends in the width direction of the expanded absorbent material protrude from both ends in the width direction of the guide belt.

In this way, the expansion absorbent material exists in the entire width direction of the inner layer side of the guide belt. Therefore, a stable winding state can be obtained, and the guide belt and the glass film can exhibit the entire width direction The equal expansion and absorption effect.

In addition, it is desirable that both ends in the width direction of the protective sheet protrude from both ends in the width direction of the expansion absorbent.

In this way, in the case of the structure where the flange is installed on the two ends of the winding core, even if the glass film moves relatively close to the flange, first, the protective sheet contacts the flange first. Therefore, the gap between the glass film and the flange can be avoided. Collision, and can also avoid contact between the expansion absorber and the flange. Therefore, the glass film and the expansion absorbent are appropriately protected.

In the above structure, one end of the guide belt in the longitudinal direction is fixed to the expansion-absorbent material.

Thereby, when the glass film is rolled, the guide belt etc. correctly guide the glass film, and a high-end glass roll can be obtained.

In this case, one end of the protective sheet in the longitudinal direction is fixed to the guide belt.

Thereby, the winding length of the protective sheet can be shortened, and its usage can be reduced.

It can also be used as a protective sheet to fix one end in the longitudinal direction to the swelling absorbent material to replace this structure.

Thereby, when the glass film is rolled, the protective sheet can act on the glass film with appropriate tension in the winding direction, and a high-end glass roll can be obtained.

The method for manufacturing the glass roll of the present invention developed to solve the aforementioned problems is characterized by having: a core manufacturing process for producing a composite core in which the expansion absorbent is wound around the core; and winding the glass film on The winding process of the composite core.

According to this structure, since the core manufacturing process is performed first and then the winding process is performed, it is not only based on the differentiation of the work, but also the improvement of work efficiency, and the glass roll manufactured by this method is as described above , With the function of the expansion absorbing material, it can fully protect the glass film that is rising in temperature.

According to the present invention, even when the temperature of the glass roll increases, the diameter of the roll core increases, it is possible to effectively prevent possible damage to the glass film.

1‧‧‧Glass roll

2‧‧‧Core

3‧‧‧Expandable absorbent material (foamed resin sheet)

3x‧‧‧The width direction end of the expansion absorbent

4‧‧‧Composite core

6‧‧‧Butt joint of swelling absorbent material

7‧‧‧Guide belt (start winding side guide belt)

7x‧‧‧The width direction end of the guide belt

9‧‧‧Glass film

9x‧‧‧The width direction end of the glass film

13‧‧‧Protection sheet

13x‧‧‧The width direction end of the protective sheet

15‧‧‧Flange

Fig. 1 is a perspective view showing the overall structure of the glass roll (especially the structure of the composite roll core) according to the embodiment of the present invention.

Fig. 2a is a front view of a single body of the expansion absorbent material of the composite core showing the constituent elements of the glass roll of the embodiment of the present invention.

Fig. 2b is a side view of a single body of the expanded absorbent material of the composite core showing the constituent elements of the glass roll according to the embodiment of the present invention.

Fig. 3 is a perspective view showing the peripheral structure of the composite core, which is a constituent element of the glass roll according to the embodiment of the present invention.

Fig. 4 is a schematic side view showing the overall structure of the glass roll according to the embodiment of the present invention.

Figure 5 shows a partial structure of the glass roll of the embodiment of the present invention Longitudinal front view.

Fig. 6a is a side view showing a state in the middle of production of a composite core, which is a constituent element of the glass roll according to the embodiment of the present invention.

Fig. 6b is a side view showing the state after production of the composite core, which is the constituent element of the glass roll according to the embodiment of the present invention.

Fig. 7a is a side view showing a state in the middle of production of a modified example of the composite core, which is the constituent element of the glass roll according to the embodiment of the present invention.

Fig. 7b is a side view showing the state after the production of the modified example of the composite core, which is the constituent element of the glass roll according to the embodiment of the present invention.

Fig. 8 is a perspective view showing a modified example of the peripheral structure of the composite core, which is the constituent element of the glass roll according to the embodiment of the present invention.

Fig. 9 is a side view showing a modification of the peripheral structure of the composite core, which is the constituent element of the glass roll according to the embodiment of the present invention.

Hereinafter, the glass roll and the manufacturing method thereof according to the embodiment of the present invention will be described with reference to the drawings.

Fig. 1 is a perspective view showing a partial structure of a glass roll according to an embodiment of the present invention. As shown in the figure, the glass roll 1 is provided with a composite roll core 4 by winding the expansion absorbing material 3 around the roll core 2. The expansion absorbing material 3 has the function of swelling and absorbing. The aforementioned swelling and absorbing function is that the core 2 expands as the temperature of the glass roll 1 rises, causing the diameter of the core 2 to increase, so that the expansion of the core 2 is prevented. The function is directly communicated to the outer periphery. As the swelling absorbing material 3, it can use A functional cushioning material or a cushioning sheet, or a shock-absorbing material or a shock-absorbing sheet, in this embodiment, a foamed resin sheet having such an expansion and absorption function is used. In this case, it is desirable that the foamed resin sheet as the expansion absorbent 3 is made of polyethylene foamed resin or the like.

As shown in Fig. 2a and Fig. 2b, the foamed resin sheet 3 as an expansion absorbent has a thickness T1 of 2mm to 7mm. Ideally, the upper limit of the thickness T1 is 6mm, the lower limit is 3mm, and the expansion ratio is 25%. To 45%, it is desirable that the upper limit of the expansion ratio is 40% and the lower limit is 30%. In addition, the length L1 of the foamed resin sheet 3 is the same as or substantially the same as the circumferential length of the outer peripheral surface 2a of the core 2. Therefore, the length L1 of the foamed resin sheet 3 corresponds to the circumferential length of the outer peripheral surface 2a of the core 2. In addition, tape bodies 5 are attached to both ends of the foamed resin sheet 3 in the longitudinal direction, respectively, and the tape bodies 5 are made of resin or the like having adhesive surfaces or bonding surfaces on both sides. In this case, it is sufficient that the tape body 5 is pasted on at least both ends of the foamed resin sheet 3 in the longitudinal direction. Therefore, one or more tape bodies may be further pasted in the middle part of the length direction, or on the entire surface (all Area) A piece of tape body can be pasted on the area, and various changes can be made.

The foamed resin sheet 3 is fixed in a state of being wound around the core 2 by the tape body 5 (refer to FIG. 1). Therefore, the foamed resin sheet 3 is stuck so that it cannot be unwound from the outer peripheral surface 2a of the core 2. In addition, the foamed resin sheet 3 is fixed to the periphery of the core 2 in a state where both ends in the longitudinal direction are opposed to each other. In this case, it is preferable that the butting portions 6 at both ends in the longitudinal direction of the foamed resin sheet 3 are in close contact, but there may be a slight gap. The gap in this case is 0.1mm to 3mm in the circumferential direction. good.

As the expansion absorbent material 3, in addition to the aforementioned foamed resin sheet, it can also be a cushioning material or shock-absorbing material made of polypropylene, polyvinyl chloride, etc., but it needs to have a thickness and expansion ratio that can exert the expansion and absorption function. And other characteristics.

The dimension in the width direction of the swellable absorbent material 3 (the dimension in the direction parallel to the axis of the core 2) is 100 mm or more in this embodiment, but among them, it is preferably 300 mm or more, more preferably 500 mm or more, and most preferably Above 1000mm.

Furthermore, the material of the core 2 is not particularly limited. For example, metals such as aluminum alloy, stainless steel, manganese steel, carbon steel, phenol resin, urea resin, melamine resin, unsaturated polyester resin, epoxy resin, and polyamine can be used. Thermosetting resins such as ethyl formate and diallyl phthalate resin, thermoplastic resins such as polyethylene, polypropylene, polystyrene, AS resin, ABS resin, isobutylene resin, and vinyl chloride resin, or These thermosetting resins, thermoplastic resins, and other reinforced plastics mixed with reinforced fibers such as glass fibers and carbon fibers. In this embodiment, vinyl chloride is used.

3 is a schematic perspective view showing the peripheral structure of the composite core 4 of the glass roll 1, and FIG. 4 is a schematic side view showing the overall structure of the glass roll 1. As shown in these figures, in the expanded absorbent material 3 of the composite core 4, the start end 7a of the guide belt on the start winding side (hereinafter referred to as the start winding side guide belt) 7 is formed by having a single side The adhesive surface or the adhesive tape body 8 composed of resin or the like is fixed. Here, the end portion 7b of the side guide tape 7 is wound, and the start end portion 9a of the glass film 9 has the same structure as described above. One of the pair of tape bodies 10 is fixed, thereby forming a state in which the glass film 9 is connected to the guide belt 7 at the start of winding. In addition, at the end portion 9b of the glass film 9, the start end portion 11a of the guide tape 11 on the winding end side (hereinafter referred to as the winding end side guide tape) 11 is fixed by a pair of tape bodies 12 with the same structure as described above, As a result, the winding end side guide tape 11 is connected to the glass film 9.

In addition, the starting end portion 13a of the protective sheet 13 is fixed to the expansion absorbent material 3 of the composite core 4 by a pair of tape bodies 14 having the same structure as described above. Furthermore, the protective sheet 13 is fixed to the swelling absorbent material 3 while covering the start end 7a of the guide belt 7 at the start of winding. However, it may be the start end 13a of the protective sheet 13 and the start of winding The starting end 7a of the side guide belt 7 is at the same position, and is fixed to the expansion-absorbent material 3 by the tape bodies 8, 14 respectively. In any case, the starting end 13a of the protective sheet 13 and the starting end 7a of the guide belt 7 at the start of winding are at both ends of the lengthwise direction of the swelling absorbent material 3 except for the butt joint 6, by It is fixed by tape bodies 8, 14.

Here, the glass film 9 is formed by, for example, a down-draw method such as an overflow down-draw method, a float method, or the like. The thickness of the glass film 9 is desirably 300 μm or less, more desirably 200 μm or less, still more desirably 100 μm or less, and most desirably 50 μm or less. In addition, the thickness of the glass film 9 is desirably 1 μm or more, and more desirably 10 μm or more. In addition, the width direction dimension of the glass film 9 is 100 mm or more in this embodiment, but among them, it is preferably 300 mm or more, more preferably 500 mm or more, and most preferably 1000 mm or more.

The thickness, width, etc. of the winding start-side guide belt 7 and the winding end-side guide belt 11 are not particularly limited, but it is desirable to have the same thickness and width as the glass film 9. Specifically, the thickness of these guide belts 7, 11 is desirably 1 μm to 200 μm, and the width direction dimension is 100 mm or more in this embodiment, among them, it is desirably 300 mm or more, more desirably 500 mm or more, and most desirably 1000 mm the above. In addition, the length of these guide belts 7, 11 is desirably 1m to 50m. In the case of using resin films as these guide belts 7, 11, for example, polyethylene terephthalate film, ionic polymer film, polyethylene film, polypropylene film, polyvinyl chloride film, poly Dichloroethylene film, polyvinyl alcohol film, polyester film, polycarbonate film, polystyrene film, polyacrylonitrile film, ethylene-vinyl acetate copolymer film, ethylene-vinyl alcohol copolymer film, ethylene-methyl Organic resin film (synthetic resin film) such as acrylic copolymer film, nylon (registered trademark) film (polyamide film), polyimide film, cellophane, etc. Moreover, when metal thin films are used as these guide tapes 7, 11, aluminum, copper, etc. can be used, for example.

The thickness of the protective sheet 13 is 1000 μm or less, 500 μm or less, or 300 μm or less, and 10 μm or more or 20 μm or more. In addition, the width direction dimension of the protective sheet 13 is 100 mm or more in this embodiment, but among them, it is preferably 300 mm or more, more preferably 500 mm or more, and most preferably 1000 mm or more. In this case, as the protective sheet 13, for example, polyethylene terephthalate film, ionic polymer film, polyethylene film, polypropylene film, polyvinyl chloride film, polyvinylidene chloride film, poly Vinyl alcohol film, polyester film, polycarbonate film Film, polystyrene film, polyacrylonitrile film, ethylene-vinyl acetate copolymer film, ethylene-vinyl alcohol copolymer film, ethylene-methacrylic acid copolymer film, nylon (registered trademark) film (polyamide film) ), polyimide film, organic resin film (synthetic resin film) such as cellophane, etc.

FIG. 5 is a longitudinal front view showing a part of the glass roll 1 in detail. In addition, this figure shows only one end part of the width direction of the glass roll 1, but the other end part of the width direction of the glass roll 1 also has the same structure. As shown in the figure, the glass roll 1 is wound with a glass film 9 and a protective sheet 13 around the expansion absorbing material 3 of the composite roll core 4. The glass film 9 is connected with the winding start side guide belt 7 and the roll The winding end side guide belt 11 is overlapped with the glass film 9 so that the protective sheet 13 is not bonded to the glass film 9, and flanges 15 are fixed to both ends of the winding core 2.

In addition, the widthwise end portions 3x of the expansion absorbent material 3 protrude from the widthwise end portions 7x and 11x of the winding start side guide belt 7 and the winding end side guide belt 11, and also protrude from the glass film 9 Both ends 9x in the width direction protrude. In contrast, the width direction end portions 13x of the protective sheet 13 are the respective width direction end portions 7x, 11x, 9x of the guide tape 7 on the winding start side, the guide tape 11 on the winding end side, and the glass film 9 It protrudes, and also protrudes from both end portions 3x in the width direction of the expansion absorbent material 3. Furthermore, it is preferable that the widthwise dimensions of the guide tape 7 at the start of the winding and the guide tape 11 at the end of the winding and the glass film 9 in the width direction are the same or substantially the same.

In this case, both ends 3x in the width direction of the swelling absorbent material 3 are in the same position and coincide with the ends 9x in the width direction of the glass film 9 That is, or if only to a small extent, the widthwise end portions 9x of the glass film 9 may protrude from the widthwise end portions 3x of the expansion absorbent material 3. In addition, the width direction end portions 7x and 11x of each of the winding start side guide tape 7 and the winding end side guide tape 11 may also be tied at the same location to coincide with the width direction end portions 3x of the expansion absorbent material 3. Or if it is only slightly, the widthwise end portions 7x and 11x of the winding start side guide belt 7 and the winding end side guide belt 11 may protrude from the widthwise end portions 3x of the expansion absorbent material 3. Furthermore, in the example shown in the figure, the widthwise end portions 13x of the protective sheet 13 are not in contact with the flange 15, but both may be in contact. In addition, in the example shown in the figure, the widthwise end portions 3x of the swelling absorbent material 3 are not in contact with the flange 15, but both may be in contact. In this way, when the two sides are brought into contact, the widthwise end portions 3x of the expansion absorbent material 3 can protrude from the widthwise end portions 13x of the protective sheet 13.

In addition, the thickness T1 of the swelling absorbent material 3 is 20 to 140 times, more preferably 30 to 130 times, the thickness T2 of each of the winding start side guide tape 7 and the winding end guide tape 11 From 40 times to 120 times. In addition, the relationship between the thickness T1 of the expansion-absorbent material 3 and the thickness T3 of the glass film 9 is also the same. In addition, the thickness T1 of the swelling absorbent material 3 is 20 times to 140 times the width T4 of the protective sheet 13, more desirably 50 times to 130 times, and most desirably 60 times to 120 times.

According to the glass roll 1 with the above-mentioned structure, even if the temperature of the glass roll 1 rises, the diameter of the core 2 increases, because the glass film 9 is wound around the composite roll core 4, which is the expansion absorbent material. 3 The outer peripheral side, therefore, the increase in the diameter of the core 2 will be affected by the expansion absorbent 3 Absorption does not cause much influence on the glass film 9. In other words, when the diameter of the core 2 increases, even if the glass film 9 does not follow the increase and stretches, due to the expansion absorption function of the expansion absorbent 3, excessive tensile stresses will not act on the glass film 9. As a result, the breakage of the glass film 9 can be effectively avoided, and the glass roll 1 which is a good product can be maintained. In addition, when a foamed resin sheet having a thickness of 2 mm to 7 mm and an expansion ratio of 25% to 45% is used as the expansion absorption material 3, a sufficient expansion absorption function can be exerted.

In addition, the swelling absorbent material 3 has a length corresponding to the full length of the outer peripheral surface 2a of the core 2 in the circumferential direction, and is fixedly attached to the periphery of the core 2 with the ends in the circumferential direction butting against each other, so that expansion can be prevented. The case where the absorbent material 3 overlaps in the circumferential direction to form a step. As a result, the glass film 9 wound around the composite winding core 4 is less likely to be deformed, undue bending stress, etc., and the glass film 9 can be smoothly wound around the composite winding core 4. Thereby, the damage of the glass film 9 caused by the increase in the diameter of the core 2 accompanying the temperature rise can be prevented more reliably.

In addition, the glass roll 1 is wound on the inner side of the glass film 9 with the guide tape 7 and the protective sheet 13 at the start of the winding, but the material, thickness, etc. of the guide tape 7 and the protective sheet 13 at the start of the winding The swelling absorbing material 3 is very different and cannot perform the swelling absorption function like the swelling absorbing material 3. Therefore, the prevention of the damage of the glass film 9 caused by the aforementioned temperature increase is prevented by the expansion absorption function of the expansion absorption material 3.

And, this glass roll 1 (the example shown in Figure 5) is expanded and sucked The widthwise end portions 3x of the collected material 3 protrude from the widthwise end portions 9x of the glass film 9, and therefore, the expansion absorbing material 3 is present in the entire width direction of the inner layer side of the glass film 9. Therefore, a stable winding state can be obtained, and the glass film 9 can exhibit an even expansion absorption function over the entire width direction.

In addition, this glass roll 1 (the example shown in FIG. 5) is the widthwise end portions 3x of the expanded absorbent material 3 protruding from the widthwise end portions 7x of the guide belt 7 on the start winding side. On the inner layer side of the side guide belt 7, the swelling absorbent material 3 exists over the entire width direction. Thereby, a stable winding state can also be obtained, and with respect to the guide belt 7 at the start of winding and further to the glass film 9, it is possible to exhibit an equal expansion absorption effect across the entire width direction.

In addition, this glass roll 1 (the example shown in FIG. 5) is the width direction end portions 13x of the protective sheet 13 from the expansion absorbent material 3, the guide tapes 7, 11, and the width direction end portions 3x, 7x of the protective sheet 13 , 11x, 13x are protruding, so even if the glass film 9 moves relatively close to the flange 15 due to vibrations, collisions, etc. during transportation, the protective sheet 13 contacts the flange 15 first. Therefore, the glass film 9 and the flange 15 can be avoided. The collision of flange 15.

Next, the manufacturing method of the glass roll 1 provided with the said structure is demonstrated. This manufacturing method generally includes: a core manufacturing process for manufacturing the composite core 4; and a winding process for winding the glass film 9 on the composite core 4 afterwards.

In the core manufacturing process, as shown in Fig. 6a, the expansion absorbent material 3 is wound around the core 2 with the ends 3y remaining in the longitudinal direction. Adjustment and position adjustment. Then, as shown in FIG. 6b, the both ends 3y in the longitudinal direction of the swelling absorbent material 3 are adhered to the outer peripheral surface 2a of the core 2 with the tape body 5. Thereby, the composite core 4 in which the expansion-absorbent material 3 is wound around the core 2 is obtained.

In the winding process, as shown in FIG. 3, the starting end 7a of the winding side guide belt 7 and the starting end 13a of the protective sheet 13 are fixed to the expansion absorbent 3 of the composite core 4, and the glass film 9 is connected to the start-winding side guide belt 7, the composite winding core 4 is rotated around the axis and the start-winding side guide belt 7, the protective sheet 13, and the glass film 9 are wound up in a roll shape To the periphery of the composite core 4. Then, when the glass film 9 is wound up to the required length, the glass film 9 is cut in the width direction, and the winding end side guide tape 11 is connected to the cut end of the glass film 9 before being further wound. Winding, thereby obtaining the glass roll 1 as shown in FIG. 4.

As an example, this winding process can be carried out in the following manner, that is, the glass film 9 that is continuously conveyed by forming by a forming device such as a down-draw method, a float method, etc. (for example, during conveyance, both ends in the width direction The part is cut by laser cutting etc.) It is wound around the composite winding core 4 together with the protective sheet 13 etc. as in the above-mentioned case. In addition, as another example, it can also be performed in the following manner, that is, the glass film 9 that is formed by a forming device and is continuously conveyed is wound around a core that does not have an expansion absorbing material to produce a mother glass roll After the glass roll, from the mother The glass roll is roll-to-roll, and the glass film 9 is wound around the composite roll core 4 with the protective sheet 13 and the like in the same manner as in the previous case.

7a and 7b are schematic side views showing a modification of the composite core 4 and the core manufacturing process. This composite roll core 4 is a layered structure of the expansion absorbent material 3 wound around the core 2, the aforementioned laminated structure of the expansion absorbent material 3 is a plurality of sheets (in the example of the figure, three sheets of hair Foam resin sheet) 3b, 3c, 3d paste. In addition, the total thickness of the plurality of sheets 3b, 3c, and 3d is the same as the thickness T1 of the foamed resin sheet 3 described above. Furthermore, this modification is different from the composite core 4 and core manufacturing process shown in FIGS. 6a and 6b only in that the expansion absorbent material 3 is made into a laminated structure. Therefore, regarding other common constituent elements The same figure numbers are assigned and their description is omitted. According to this modified example, there is an advantage that even if the thickness of a single sheet material 3b, 3c, 3d is uneven, the thickness unevenness can be reduced by forming these sheet materials in a laminated structure .

Fig. 8 is a schematic perspective view showing a modification of the installation structure of the guide tape 7 and the protective sheet 13 on the winding start side to the composite core 4, and Fig. 9 is a schematic side view of the glass roll 1 of this modification. As shown in these figures, the start end 7a of the start-winding side guide belt 7 is fixed to the expanded absorbent material 3 of the composite core 4, and the middle part of the longitudinal direction of the start-winding side guide belt 7 (starts winding The part of the side guide belt 7 near the end portion 7b) is fixed with the starting end portion 13a of the protective sheet 13 by the tape body 14. Other structural elements are the same as the glass roll shown in Figures 3 and 4 above. 1 is the same, therefore, the same drawing numbers are assigned to the components common to both, and the description thereof is omitted. According to this modified example, there is an advantage that the protective sheet 13 can be made into a short strip shape. Therefore, the usage amount can be reduced and the cost can be reduced.

Furthermore, in the above embodiment, the protective sheet 13 is wound around the composite core 4 without being bonded to the glass film 9. However, instead of this structure, the protective sheet 13 may be attached to the glass as a laminated film. The film 9 is wound around the composite core 4 again. Also, in this case, the glass film 9 to which the laminated film is attached may be wound around the composite winding core 4 in a state where different protective sheets are overlapped without being adhered.

In addition, in the above embodiment, the expanded absorbent material 3 of the composite core 4 is in a state where both ends in the longitudinal direction are butted, but it may be wound around the core 2 in a state where both ends in the longitudinal direction overlap. In this case, in order to prevent a large step difference from being generated on the outer peripheral surface of the swelling absorbent material 3, it is desirable to form the end surface of the outermost layer of the swelling absorbent material 3 so that the thickness gradually decreases as it moves to the terminal side.

Furthermore, in the above embodiment, a sheet such as a foamed resin sheet is used as the expansion absorbent 3 of the composite core 4 and then wound around the core 2, but it may be composed of foamed resin or the like. A structure in which the sheet material is inserted into the core 2 and then wound.

1‧‧‧Glass roll

2‧‧‧Core

2a‧‧‧Outer peripheral surface

3‧‧‧Expandable absorbent material (foamed resin sheet)

4‧‧‧Composite core

5‧‧‧Tape body

6‧‧‧Butt joint of swelling absorbent material

Claims (12)

A glass roll, characterized in that it is tied to a composite roll core that wraps an expansion-absorbent material around the core, and is wound with a glass film in a state of being overlapped with a protective sheet, and both ends of the protective sheet in the width direction are absorbed from the expansion Both ends protrude in the width direction of the material. Such as the glass roll of the first item in the scope of patent application, wherein the aforementioned expansion-absorbing material is a foamed resin sheet with a thickness of 2mm to 7mm. For example, the glass roll of item 1 or 2 of the scope of patent application, wherein the aforementioned expansion-absorbing material is a foamed resin sheet with a foaming ratio of 25% to 45%. For example, the glass roll of item 1 or 2 of the scope of patent application, wherein the expansion-absorbent material has a length corresponding to the full length of the outer peripheral surface of the roll core in the circumferential direction, and is wound in a state where both ends in the circumferential direction are butted Around the aforementioned core. For example, the glass roll of item 1 or 2 of the scope of patent application, wherein the glass film is wound on the composite roll core in a state where the glass film is connected to a guide belt. For example, the glass roll of item 1 or 2 of the scope of patent application, wherein the glass film is wound on the composite roll core in a state where the glass film is overlapped with the protective sheet. For example, the glass roll of item 1 or 2 of the scope of patent application, wherein the widthwise ends of the expansion-absorbing material protrude from the widthwise ends of the glass film. For example, the glass roll of item 5 of the scope of patent application, in which the aforementioned expansion Both ends in the width direction of the swelling absorbent material protrude from both ends in the width direction of the aforementioned guide belt. For example, the glass roll of item 5 of the scope of patent application, wherein one end of the guide belt in the longitudinal direction is fixed to the expansion absorbent. For example, the glass roll of item 9 of the scope of patent application, wherein one end of the protective sheet in the longitudinal direction is fixed to the guide belt. For example, the glass roll of item 6 of the scope of patent application, wherein one end of the protective sheet in the longitudinal direction is fixed to the expansion-absorbing material. A method for manufacturing a glass roll, which is characterized by having: a core manufacturing process for producing a composite core that winds an expanded absorbent material around the core; and a glass film in a state where the composite core is wound on the protective sheet In the winding process, in the winding process, both ends in the width direction of the protective sheet protrude from both ends in the width direction of the expansion absorbent.

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