CN108025880B

CN108025880B - Glass roll and method for producing same

Info

Publication number: CN108025880B
Application number: CN201680054610.7A
Authority: CN
Inventors: 鉴继薰; 秋山修二; 石田直也
Original assignee: Nippon Electric Glass Co Ltd
Current assignee: Nippon Electric Glass Co Ltd
Priority date: 2015-12-17
Filing date: 2016-11-22
Publication date: 2020-05-12
Anticipated expiration: 2036-11-22
Also published as: TWI700255B; KR102557121B1; TW201733938A; JP2017109850A; CN108025880A; KR20180095497A; WO2017104364A1; JP6699159B2

Abstract

The invention provides a glass roll and a method for manufacturing the same. The glass roll (1) is configured by winding a glass film (9) around a composite winding core (4) formed by winding an expansion absorbing material (3) around a winding core (2).

Description

Glass roll and method for producing same

Technical Field

The present invention relates to a glass roll in which a glass film is wound around a winding core and a method for manufacturing the same, and more particularly to a technique for improving the peripheral structure of the winding core.

Background

As is well known, there is a demand for weight reduction of thin display devices such as liquid crystal displays and organic EL displays, and mobile devices such as smart phones and integrated PCs, which have rapidly become widespread in recent years. Therefore, as the glass substrate used in these apparatuses, a glass film thinned to a film shape is supplied in practical use.

The glass film is formed into a substantially rectangular shape or the like at the stage of the final product, but is processed into a strip-like shape at various processing steps including the manufacturing step and the like.

Since such a glass film has appropriate flexibility, it is common practice to form the glass film in a form of a glass roll wound around a winding core in consideration of convenience in handling, storage, transportation, or the like. In this way, the glass roll can be formed to have excellent handling properties of the glass film, and the operation can be made efficient even when the glass film is subjected to various treatments.

In this glass roll, for example, as described in patent document 1, the core is made of metal or the like, or the core is made of thermoplastic resin such as vinyl chloride or the like from the viewpoint of weight reduction or the like. Then, the glass film is wound by applying a necessary tension in the winding direction around the winding core, thereby producing a glass roll.

The glass roll thus manufactured is shipped from a glass manufacturer or the like in a package, and is carried into an equipment manufacturer or the like that manufactures the above-described various final products by long-distance transportation or the like.

Prior art documents

Patent document

Patent document 1: japanese patent laid-open publication No. 2015-51912

Disclosure of Invention

Problems to be solved by the invention

However, in the transportation of the glass roll, the temperature change occurs not only due to the daily temperature change but also due to a difference in region between the glass manufacturer and the equipment manufacturer. Accordingly, when the temperature of the glass roll increases, the following problems occur.

That is, the winding core of the glass roll is made of a resin such as metal or vinyl chloride as described above, and therefore has a characteristic of being easily expanded by a temperature rise. On the other hand, the glass film wound around the winding core has a characteristic of being less likely to stretch even if the temperature rises.

Therefore, when the diameter of the winding core increases with an increase in temperature, tensile stress acts on the glass film, and when the tensile stress value increases excessively, the glass film is broken. The breakage of the glass film may occur not only in the inner layer portion around the winding core of the glass roll but also in the outer layer portion.

Therefore, a problem arises in that a glass roll manufactured as a non-defective product by a glass manufacturer or the like becomes a defective product and cannot be used during shipment. The same problem may occur when a temperature rise occurs during the production of a glass roll by a glass manufacturer or the like or during storage.

From the above-described points, an object of the present invention is to effectively avoid the occurrence of breakage of a glass film when the diameter of a winding core increases with an increase in temperature of a glass roll.

Means for solving the problems

In order to solve the above problem, a glass roll according to the present invention is characterized in that a glass film is wound around a composite winding core formed by winding an expansion absorbing material around a winding core. Here, "swell absorption" means that the swell of the winding core is absorbed so that the glass film is stretched without following the swell with respect to the swell (increase in diameter) of the winding core.

According to this configuration, even if the diameter of the core increases due to a temperature rise of the glass roll, since the glass film is wound around the outer peripheral side of the expansion absorbing material that is a constituent element of the composite core, the increase in the diameter of the core is absorbed by the expansion absorbing material, and does not greatly affect the glass film. In other words, when the diameter of the winding core is increased, even if the glass film does not stretch following the expansion, excessive tensile stress does not act on the glass film by the expansion absorbing function of the expansion absorbing material. As a result, breakage of the glass film can be effectively avoided, and the qualified glass roll can be maintained. From such a viewpoint, as the expansion absorbing material, a cushion material or a cushion sheet having an expansion absorbing function with respect to the wound glass film, or a cushion material or a cushion sheet having an expansion absorbing function can be used. Here, the expansion-absorbing material preferably has a characteristic of changing the thickness of the member by 0.5mm or more when the compressive stress acting in the radial direction of the member is changed by a change in the diameter of the winding core due to a temperature change.

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

Thus, the foamed resin sheet can sufficiently exhibit the expansion absorbing function, and can appropriately prevent the glass film from being damaged due to the temperature rise of the glass roll. Then, when the thickness of the foamed resin sheet is 2mm to 7mm, the inhibition of the expansion absorbing function caused by the insufficient thickness thereof is suppressed, and the excessive quality caused by the excessively thick thickness thereof is also suppressed. That is, if the thickness of the foamed resin sheet is less than 2mm, the expansion and absorption function may not be sufficiently exhibited. On the other hand, if the thickness of the foamed resin sheet exceeds 7mm, the quality becomes excessive and material waste occurs. Therefore, if the thickness is within the above numerical range, such a disadvantage can be avoided.

The expansion ratio of the foamed resin sheet is preferably 25% to 45%.

In this way, the foamed resin sheet can sufficiently exhibit the expansion and absorption function from the material surface. That is, when the expansion ratio of the foamed resin sheet is less than 25%, the flexibility tends to be small and the foamed resin sheet tends to be excessively hard, and therefore, there is a possibility that the glass film is also stretched following the increase in the diameter of the winding core, and an excessive tensile stress acts thereon. On the other hand, if the expansion ratio of the foamed resin sheet exceeds 45%, the flexibility tends to increase and the foamed resin sheet tends to be too soft, and even before the diameter of the winding core increases, the foamed resin sheet may be compressed improperly by the winding of the glass film. Thus, if the expansion ratio is within the above numerical range, such a disadvantage can be avoided.

In the above configuration, the expansion-absorbing material preferably has a length corresponding to the entire length of the outer peripheral surface of the core in the circumferential direction, and is wound around the core in a state where both end portions in the circumferential direction are in contact with each other.

Thus, the expansion-absorbing materials are prevented from overlapping in the circumferential direction to form a step, and the glass film can be smoothly wound around the composite winding core without causing undue deformation or undue bending stress. This can more reliably prevent the glass film from being damaged due to an increase in the diameter of the winding core caused by a temperature increase.

In the above configuration, the glass film is preferably wound around the composite winding core in a state of being coupled to the guide.

In this way, the guide can be wound around the outer periphery of the expansion absorbing material and around the inner periphery of the glass film. In this case, even when the glass film is connected to the guide and the expansion absorbing material is not wound around the winding core, it has been found that the present inventors have found that the glass film is damaged when the temperature of the glass roll is increased. The guide is not connected to the glass film in order to exhibit the expansion absorbing function against the expansion of the winding core, but is used in order to appropriately pull the glass film when the glass film is wound. Therefore, even when the glass film is connected to the guide, if the expansion absorbing function by the expansion absorbing material cannot be exhibited, it is not possible to prevent the glass film from being damaged due to the temperature rise of the glass roll. This means that even if the leader is present on the inner layer side of the glass film, the breakage of the glass film can be prevented after the expansion absorbing material further present on the inner layer side of the leader exerts the expansion absorbing function.

In this case, the thickness of the expansion absorbing material is preferably 20 to 140 times the thickness of the guide.

Thus, the effect of preventing the glass film from being damaged by the expansion absorbing material can be obtained appropriately without causing the enlargement of the glass roll due to the increase in the thickness of the leader. Therefore, if the relationship between the thicknesses of the two materials is the above numerical relationship, the swelling absorbing material can sufficiently exhibit the swelling absorbing function, and the guide can sufficiently exhibit its original function, that is, the function of appropriately pulling the glass film.

In the above configuration, the glass film may be wound around the composite winding core in a state of being overlapped with the protective sheet.

Thus, the glass films are prevented from contacting each other by the protective sheet, and the glass films are less likely to be damaged. In this case, even when the glass film is wound around the winding core in a state of being overlapped with the protective sheet, it is known as a result of the study by the present inventors that the glass film is broken when the temperature of the glass roll is increased in a case where the expansion absorbing material is not fixed around the winding core. The protective sheet is not overlapped with the glass film for the purpose of absorbing swelling, but is used for appropriately winding the glass film without damaging the glass film. Therefore, even when the glass film and the protective sheet are stacked, if the expansion absorbing function by the expansion absorbing material is not exerted, it is not possible to prevent the glass film from being damaged due to the temperature rise of the glass roll. This means that even if the protective sheet is present on the inner layer side of the glass film, the swelling absorbing material present further on the inner layer side of the protective sheet exerts a swelling absorbing function, and then the glass film can be prevented from being broken.

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

Thus, the effect of preventing the breakage of the glass film by the expansion absorbing material can be appropriately obtained without causing the enlargement of the glass roll due to the thickness of the protective sheet. Therefore, if the relationship between the thicknesses of the two materials is the above-described numerical relationship, the swelling absorbing material can sufficiently exhibit the swelling absorbing function, and the protective sheet can sufficiently exhibit its original function, that is, the function of imparting an appropriate tension to the glass film while preventing the glass film from being damaged.

In the above configuration, both widthwise ends of the expansion absorbing material preferably protrude from both widthwise ends of the glass film.

In this way, since the swelling absorbing material is present on the inner layer side of the glass film over the entire length in the width direction, a stable wound state can be obtained, and a uniform swelling absorbing effect can be exhibited over the entire length in the width direction with respect to the glass film.

Further, both widthwise ends of the expansion-absorbing material preferably protrude from both widthwise ends of the guide.

In this way, since the swelling absorbing material is present on the inner layer side of the leader over the entire length in the width direction, a stable wound state can be obtained, and a uniform swelling absorbing effect can be exerted on the leader and the glass film over the entire length in the width direction.

Further, both widthwise ends of the protective sheet preferably protrude from both widthwise ends of the expansion-absorbing material.

In the case where the flanges are attached to both ends of the winding core, the protective sheet first comes into contact with the flanges even when the glass film and the flanges move relatively close to each other, so that the glass film is prevented from colliding with the flanges, and the expansion absorbing material is prevented from coming into contact with the flanges. Thus, the glass film and the expansion absorbing material are appropriately protected.

In the above configuration, the one end portion in the longitudinal direction of the guide may be fixed to the expansion absorbing material.

In this way, the leader can appropriately pull the glass film when winding the glass film, and a high-quality glass roll can be obtained.

In this case, one end portion of the protective sheet in the longitudinal direction may be fixed to the guide.

This can shorten the winding length of the protective sheet and reduce the amount of use.

Alternatively, one end in the longitudinal direction of the protective sheet may be fixed to the expansion absorbing material.

In this way, when the glass film is wound, a tension in the winding direction can be appropriately applied to the glass film from the protective sheet, and a high-quality glass roll can be obtained.

In order to solve the above problems, a method for manufacturing a glass roll according to the present invention includes: a core production step of producing a composite core in which an expansion absorbing material is wound around a core; and a winding step of winding the glass film around the composite winding core.

According to this configuration, since the winding step is performed after the core forming step is performed first, the work efficiency is improved by the division of the work, and the glass roll manufactured by this method sufficiently protects the glass film against the temperature rise by the function of the expansion absorbing material as described above.

Effects of the invention

According to the present invention, even when the diameter of the winding core increases with an increase in temperature of the glass roll, breakage of the glass film that may occur can be effectively prevented.

Drawings

Fig. 1 is a perspective view showing the entire structure of a glass roll (particularly, the structure of a composite winding core) according to an embodiment of the present invention.

Fig. 2a is a front view of a single body showing an expansion absorbing material of a composite winding core which is a component of a glass roll according to an embodiment of the present invention.

Fig. 2b is a single side view showing the expansion absorbing material of the composite winding core, which is a component of the glass roll according to the embodiment of the present invention.

Fig. 3 is a perspective view of a main portion showing a peripheral structure of a composite winding core as a constituent element of a glass roll according to an embodiment of the present invention.

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

Fig. 5 is a longitudinal front view showing the structure of a main part of a glass roll according to an embodiment of the present invention.

Fig. 6a is a side view showing a state in the middle of manufacturing a composite winding core that is a component of a glass roll according to an embodiment of the present invention.

Fig. 6b is a side view showing a state after manufacturing a composite winding core that is a component 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 manufacturing a modified example of the composite winding core that is a component of the glass roll according to the embodiment of the present invention.

Fig. 7b is a side view showing a state after manufacturing of a modified example of the composite winding core which is a component 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 winding core 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 winding core of the glass roll according to the embodiment of the present invention.

Detailed Description

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

Fig. 1 is a perspective view showing a main part of a glass roll according to an embodiment of the present invention. As shown in the figure, the glass roll 1 includes a composite core 4 in which an expansion absorbing material 3 is wound around a core 2. The expansion absorbing material 3 has an expansion absorbing function of preventing expansion of the core 2 from being directly transmitted to the outer peripheral side when the core 2 expands due to temperature rise of the glass roll 1 and the diameter of the core 2 increases. As the expansion absorbing material 3, a cushion material or a cushion sheet, or a cushion material or a cushion sheet having such an expansion absorbing function can be used, and in the present embodiment, a foamed resin sheet having such an expansion absorbing function is used. In this case, the foamed resin sheet 3 as the expansion absorbing material is preferably made of a polyethylene foamed resin or the like.

As shown in fig. 2a and 2b, the thickness T1 of the foamed resin sheet 3 as the expansion and absorption material is 2mm to 7mm, the upper limit of the thickness T1 is preferably 6mm, the lower limit thereof is 3mm, and the expansion ratio is 25% to 45%, and the upper limit thereof is preferably 40% and the lower limit thereof is preferably 30%. 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 winding 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 winding core 2. Then, tape bodies 5 made of resin or the like having adhesive surfaces or bonding surfaces on both surfaces are bonded to both ends of the foamed resin sheet 3 in the longitudinal direction. In this case, since the tape bodies 5 are only required to be attached to at least both end portions in the longitudinal direction of the foamed resin sheet 3, various modifications can be made such as attaching one or more tape bodies to the intermediate portion in the longitudinal direction, or attaching one tape body over the entire surface (entire area).

The foamed resin sheet 3 is fixed by the tape body 5 in a state of being wound around the winding core 2 (see fig. 1). Therefore, the foamed resin sheet 3 is attached so as not to be wound around the outer peripheral surface 2a of the winding core 2. The foamed resin sheet 3 is fixed around the winding core 2 in a state where both ends in the longitudinal direction are butted against each other. In this case, the abutting portions 6 at both ends in the longitudinal direction of the foamed resin sheet 3 are preferably in close contact with each other, but a minute gap may be provided therebetween. The gap in this case is preferably 0.1mm to 3mm with respect to the circumferential direction.

The expansion-absorbing material 3 may be a cushion material or a cushion material made of polypropylene, polyvinyl chloride, or the like, other than the above-described foamed resin sheet, but is required to have properties such as a thickness and an expansion ratio sufficient to exhibit the expansion-absorbing function.

The dimension in the width direction of the expansion-absorbing material 3 (the dimension in the direction parallel to the axial center of the core 2) is 100mm or more in the present embodiment, but is preferably 300mm or more, more preferably 500mm or more, and still more preferably 1000mm or more.

The material of the winding core 2 is not particularly limited, and examples thereof include metals such AS aluminum alloy, stainless steel, manganese steel, and carbon steel, thermosetting resins such AS phenol resin, urea resin, melamine resin, unsaturated polyester resin, epoxy resin, polyurethane, and polydiallyl terephthalate resin, thermoplastic resins such AS polyethylene, polypropylene, polystyrene, AS resin, ABS resin, methacrylic resin, and vinyl chloride, and reinforced plastics obtained by mixing these thermosetting resins and thermoplastic resins with reinforcing fibers such AS glass fibers and carbon fibers. In the present embodiment, vinyl chloride is used.

Fig. 3 is a schematic perspective view showing the peripheral structure of the composite winding core 4 of the glass roll 1, and fig. 4 is a schematic side view showing the entire structure of the glass roll 1. As shown in the above figures, the leading end portion 7a of the windup-side guide (hereinafter referred to as windup-side guide) 7 is fixed to the expansion absorbing material 3 of the composite core 4 by a tape body 8 made of resin or the like having an adhesive surface or an adhesive surface on one surface thereof. The starting end portion 9a of the glass film 9 is fixed to the terminal end portion 7b of the winding-up side leader 7 by a pair of tapes 10 having the same configuration as described above, and the glass film 9 is connected to the winding-up side leader 7. Further, the leading end portion 11a of the winding-end-side guide (hereinafter referred to as a winding-end-side guide) 11 is fixed to the terminal end portion 9b of the glass film 9 by a pair of belts 12 having the same configuration as described above, and the winding-end-side guide 11 is connected to the glass film 9.

Further, the leading end portion 13a of the protective sheet 13 is fixed to the expansion absorbing material 3 of the composite winding core 4 by the tape body 14 having the same structure as described above. The protective sheet 13 is fixed to the swelling absorbent member 3 in a state of covering the leading end portion 7a of the winding-up side guide 7, but the leading end portion 13a of the protective sheet 13 and the leading end portion 7a of the winding-up side guide 7 may be fixed to the swelling absorbent member 3 by the

belts

8 and 14 at the same position. In either case, the leading end 13a of the protective sheet 13 and the leading end 7a of the windup side guide 7 are preferably fixed to the swelling absorbent material 3 by the

belts

8 and 14 except for the abutting portions 6 at both longitudinal ends.

Here, the glass film 9 is formed by, for example, a down-draw method such as an overflow down-draw method or a float method. The thickness of the glass film 9 is preferably 300 μm or less, more preferably 200 μm or less, and further preferably 100 μm or less to 50 μm or less. On the other hand, the thickness of the glass film 9 is preferably 1 μm or more, and more preferably 10 μm or more. In the present embodiment, the width-directional dimension of the glass film 9 is 100mm or more, preferably 300mm or more, more preferably 500mm or more, and still more preferably 1000mm or more.

The thickness and width of the winding-side guide 7 and the winding-side guide 11 are not particularly limited, but preferably have the same thickness and width as those of the glass film 9. Specifically, the thickness of the

guides

7 and 11 is preferably 1 to 200 μm, and the width dimension is 100mm or more, preferably 300mm or more, more preferably 500mm or more, and further preferably 1000mm or more in the present embodiment. The length of the

guides

7 and 11 is preferably 1m to 50 m. When resin films are used as the

guides

7 and 11, for example, polyethylene terephthalate films, ionomer films, polyethylene films, polypropylene films, polyvinyl chloride films, polyvinylidene chloride films, polyvinyl alcohol films, polyester films, polycarbonate films, polystyrene films, polyacrylonitrile films, ethylene-vinyl acetate copolymer films, ethylene-vinyl alcohol copolymer films, ethylene-methacrylic acid copolymer films, nylon (registered trademark) films (polyamide films), polyimide films, organic resin films (synthetic resin films) such as cellophane films, and the like can be used. When a metal film is used as the

guides

7 and 11, for example, aluminum, copper, or the like can be used.

The protective sheet 13 has a thickness of 1000 μm or less, or 500 μm or less, or 300 μm or less, and 10 μm or more, or 20 μm or more. The protective sheet 13 has a width dimension of 100mm or more in the present embodiment, preferably 300mm or more, more preferably 500mm or more, and still more preferably 1000mm or more. In this case, as the protective sheet 13, for example, an organic resin film (synthetic resin film) such as a polyethylene terephthalate film, an ionomer film, a polyethylene film, a polypropylene film, a polyvinyl chloride film, a polyvinylidene chloride film, a polyvinyl alcohol film, a polyester film, a polycarbonate film, a polystyrene film, a polyacrylonitrile film, an ethylene-vinyl acetate copolymer film, an ethylene-vinyl alcohol copolymer film, an ethylene-methacrylic acid copolymer film, a nylon (registered trademark) film (polyamide film), a polyimide film, a cellophane film, or the like can be used.

Fig. 5 is a longitudinal cut front view showing a main part of the glass roll 1 in detail. In the figure, only one end portion in the width direction of the glass roll 1 is shown, but the other end portion in the width direction of the glass roll 1 has the same configuration. As shown in the figure, the glass roll 1 is formed by winding a glass film 9 to which a winding-side guide 7 and a final-side guide 11 are coupled and a protective sheet 13 which is not stuck to the glass film 9 around an expansion absorbing material 3 of a composite winding core 4, and flanges 15 are fixed to both ends of the winding core 2.

Then, both width-direction end portions 3x of the expansion absorbing material 3 protrude from both width-

direction end portions

7x, 11x of the windup side guide 7 and the windup side guide 11, respectively, and also protrude from both width-direction end portions 9x of the glass film 9. On the other hand, the protective sheet 13 has both width-direction end portions 13x protruding from both width-

direction end portions

7x, 11x, and 9x of the winding-side guide 7, the winding-side guide 11, and the glass film 9, respectively, and also protruding from both width-direction end portions 3x of the expansion absorbing material 3. The width-directional dimensions of the windup-side guide 7 and the final-side guide 11 are preferably the same or substantially the same as those of the glass film 9.

In this case, the both width-direction end portions 3x of the expansion absorbing material 3 may be aligned at the same positions as the both width-direction end portions 9x of the glass film 9, or the both width-direction end portions 9x of the glass film 9 may be slightly protruded from the both width-direction end portions 3x of the expansion absorbing material 3. Further, the width-direction both

end portions

7x, 11x of the windup side guide 7 and the finishing side guide 11 may be aligned at the same positions as the width-direction both end portions 3x of the expansion absorbing material 3, or the width-direction both

end portions

7x, 11x of the windup side guide 7 and the finishing side guide 11 may be slightly protruded from the width-direction both end portions 3x of the expansion absorbing material 3. In the illustrated example, the both width-direction end portions 13x of the protective sheet 13 do not contact the flange 15, but may contact both. In the illustrated example, the two widthwise end portions 3x of the expansion absorbing material 3 are not in contact with the flange 15, but may be in contact with each other. When the two are brought into contact with each other in this way, the both width-direction end portions 3x of the expansion absorbing material 3 may protrude from the both width-direction end portions 13x of the protective sheet 13.

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

According to the glass roll 1 having the above-described configuration, even if the diameter of the core 2 increases due to a temperature rise of the glass roll 1, since the glass film 9 is wound around the outer peripheral side of the expansion-absorbing material 3 that is a constituent element of the composite core 4, the increase in the diameter of the core 2 is absorbed by the expansion-absorbing material 3, and does not greatly affect the glass film 9. Therefore, when the diameter of the winding core 2 is increased, even if the glass film 9 does not stretch following the increase, excessive tensile stress does not act on the glass film 9 by the expansion absorbing function of the expansion absorbing material 3. As a result, breakage of the glass film 9 can be effectively avoided, and the qualified glass roll 1 can be maintained. In addition, when a foamed resin sheet having a thickness of 2 to 7mm and an expansion ratio of 25 to 45% is used as the expansion absorbing material 3, a sufficient expansion absorbing function can be exhibited.

Further, since the expansion-absorbing material 3 is fixed to the periphery of the core 2 in a state where the expansion-absorbing material has a length corresponding to the entire circumferential length of the outer circumferential surface 2a of the core 2 and the circumferential ends abut against each other, it is possible to prevent the expansion-absorbing material 3 from overlapping in the circumferential direction and forming a step. Accordingly, the glass film 9 wound around the composite winding core 4 is less likely to be deformed or bent improperly, and the glass film 9 is wound around the composite winding core 4 smoothly. This can more reliably prevent the glass film 9 from being damaged due to an increase in the diameter of the winding core 2 caused by a temperature increase.

In the glass roll 1, the windup-side guide 7 and the protective sheet 13 are wound around the inner layer side of the glass film 9, but the materials, thicknesses, and the like of the two 7 and 13 are largely different from those of the expansion absorbing material 3, and the expansion absorbing function as the expansion absorbing material 3 cannot be exhibited. Therefore, the prevention of breakage of the glass film 9 due to the temperature rise is determined by the expansion absorption function of the expansion absorbing material 3.

In the glass roll 1 (example shown in fig. 5), the expansion absorbing material 3 is present on the inner layer side of the glass film 9 over the entire length in the width direction because the width-direction both end portions 3x of the expansion absorbing material 3 protrude from the width-direction both end portions 9x of the glass film 9. Therefore, a stable wound state can be obtained, and a uniform expansion absorbing function can be exerted on the glass film 9 over the entire region in the width direction.

In the glass roll 1 (example shown in fig. 5), the expansion absorbing material 3 is present on the inner layer side of the windup side lead 7 over the entire length in the width direction thereof because the width-direction both end portions 3x of the expansion absorbing material 3 protrude from the width-direction both end portions 7x of the windup side lead 7. This also enables the winding-side guide 7 and the glass film 9 to exhibit a uniform expansion absorption effect over the entire width direction while achieving a stable winding state.

In the glass roll 1 (example shown in fig. 5), since the both width-direction end portions 13x of the protective sheet 13 protrude from the expansion absorbing material 3, the

guides

7 and 11, and the both width-

direction end portions

3x, 7x, 11x and 13x of the protective sheet 13, even if the glass film 9 and the flange 15 relatively approach each other due to vibration, impact, or the like during transportation, the protective sheet 13 first comes into contact with the flange 15, and thus collision between the glass film 9 and the flange 15 is avoided.

Next, a method for manufacturing the glass roll 1 having the above-described structure will be described. The manufacturing method roughly includes a core manufacturing step of manufacturing the composite core 4 and a winding step of winding the glass film 9 around the composite core 4.

In the core forming step, as shown in fig. 6a, the expansion-absorption material 3 is stretched and contracted to adjust the length and position thereof in a state where the expansion-absorption material 3 is wound around the core 2 so as to leave both longitudinal end portions 3 y. Thereafter, as shown in fig. 6b, both longitudinal end portions 3y of the expansion absorbing material 3 are attached to the outer peripheral surface 2a of the winding core 2 by the tape 5. Thereby, the composite core 4 in which the expansion-absorbing material 3 is wound around the core 2 is obtained.

In the winding step, as shown in fig. 3, the winding-up side guide 7, the protective sheet 13, and the glass film 9 are wound around the composite core 4 in a roll shape while the leading end portion 7a of the winding-up side guide 7 and the leading end portion 13a of the protective sheet 13 are fixed to the swelling absorbent material 3 of the composite core 4 and the glass film 9 is coupled to the winding-up side guide 7 while the composite core 4 is rotated around the axis. Then, the glass film 9 is cut in the width direction at the time of winding the glass film to a desired length, and the final winding side guide 11 is connected to the cut end portion of the glass film 9 and further wound, thereby obtaining a glass roll 1 as shown in fig. 4.

This winding step is performed, for example, by winding the glass film 9 formed by a forming device such as a down draw method or a float method and continuously conveyed (for example, both ends in the width direction are cut off by laser cutting or the like during conveyance) around the composite winding core 4 together with the protective sheet 13 or the like as in the above case. In another example, the winding step is performed by winding the glass film 9 formed by the forming device and continuously conveyed around a core having no expansion absorbing material to form a base glass roll, and then winding the base glass roll so that the glass film 9 is wound around the composite core 4 together with the protective sheet 13 and the like in a roll-to-roll manner in the same manner as described above.

Fig. 7a and 7b are schematic side views showing modifications of the composite winding core 4 and the winding core manufacturing process. The composite core 4 is formed by winding around the core 2 an expansion absorbing material 3 having a laminated structure in which a plurality of sheet materials (3 foamed resin sheets in the drawing) 3b, 3c, and 3d are laminated. 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. Note that this modification is different from the composite core 4 and the core production process shown in fig. 6a and 6b described above only in that the expansion-absorption material 3 has a laminated structure, and therefore the same reference numerals are given to other common components, and the description thereof is omitted. According to this modification, even if the thickness of each of the

sheets

3b, 3c, and 3d varies, the variation in thickness can be reduced by providing the sheets with a laminated structure.

Fig. 8 is a schematic perspective view showing a modification of the mounting structure of the winding-side guide 7 and the protective sheet 13 to the composite winding core 4, and fig. 9 is a schematic side view showing the glass roll 1 of this modification. As shown in the above figures, the start end portion 7a of the winding-side guide 7 is fixed to the swelling absorbent material 3 of the composite core 4, and the start end portion 13a of the protective sheet 13 is fixed to the longitudinal intermediate portion of the winding-side guide 7 (the portion of the winding-side guide 7 on the side closer to the end portion 7 b) by the tape 14. Since other components are the same as those of the glass roll 1 shown in fig. 3 and 4, the same reference numerals are given to the components common to both components, and the description thereof will be omitted. According to this modification, since the protective sheet 13 can be shortened, there is an advantage that the amount of use thereof can be reduced to reduce the cost.

In the above embodiment, the protective sheet 13 is configured to be wound around the composite core 4 without being bonded to the glass film 9, but instead, the protective sheet 13 may be configured to be a laminate film and wound around the composite core 4 in a state of being bonded to the glass film 9. In the case of such an arrangement, the glass film 9 to which the laminate film is attached may be wound around the composite core 4 in a state where the glass film 9 is superposed on the glass film 9 without bonding a separate protective sheet to the glass film.

In the above embodiment, the expansion-absorption material 3 of the composite core 4 is in a state in which both longitudinal end portions are butted against each other, but may be wound around the core 2 in a state in which both longitudinal end portions are overlapped. In the case of such an arrangement, in order to prevent the outer peripheral surface of the expansion-absorbing material 3 from having a large step, it is preferable that the end surface of the outermost layer of the expansion-absorbing material 3 be formed so that the thickness thereof gradually decreases as it moves to the terminal end side.

In the above embodiment, the expansion absorbing material 3 of the composite core 4 is formed by using a sheet such as a foamed resin sheet and winding the sheet around the core 2, but may be formed by fitting a tubular sheet made of a foamed resin or the like and winding the sheet around the core 2.

Description of the reference numerals

1 glass roll

2 roll core

3 expansion absorbing material (foaming resin sheet)

Width direction end of 3x expansion absorbing material

4 composite roll core

6 butt joint part of expansion absorption material

7 guide piece (reeling side guide piece)

Width direction end of 7x guide

9 glass film

Width direction end of 9x glass film

13 protective sheet

Width direction end of 13x protective sheet

15 Flange

Claims

1. A glass roll is characterized in that the glass roll is provided with a roll body,

the glass film is wound around a composite winding core formed by winding an expansion absorbing material around the winding core in a state of being overlapped with the protective sheet,

both widthwise ends of the protective sheet protrude from both widthwise ends of the expansion absorbing material.

2. The glass roll according to claim 1,

the expansion absorption material is a foamed resin sheet with the thickness of 2 mm-7 mm.

3. The glass roll according to claim 1 or 2,

the expansion absorbing material is a foamed resin sheet with a foaming ratio of 25-45%.

4. The glass roll according to claim 1 or 2,

the expansion absorbing material has a length corresponding to the entire circumferential length of the outer circumferential surface of the winding core, and is wound around the winding core in a state where both circumferential ends are in contact with each other.

5. The glass roll according to claim 1 or 2,

the glass film is wound around the composite winding core in a state of being coupled to a guide.

6. The glass roll according to claim 1 or 2,

both widthwise ends of the expansion absorbing material protrude from both widthwise ends of the glass film.

7. The glass roll according to claim 5,

both widthwise ends of the expansion-absorbing material protrude from both widthwise ends of the guide member.

8. The glass roll according to claim 5,

one end in the longitudinal direction of the guide is fixed to the expansion absorbing material.

9. The glass roll according to claim 8,

one end portion in the longitudinal direction of the protective sheet is fixed to the guide.

10. The glass roll according to claim 1 or 2,

one end in the longitudinal direction of the protective sheet is fixed to the expansion absorbing material.

11. A method for manufacturing a glass roll, characterized in that,

the method for manufacturing the glass roll comprises the following steps:

a core production step of producing a composite core in which an expansion absorbing material is wound around a core; and

a winding step of winding the glass film around the composite winding core in a state of being overlapped with the protective sheet,

in the winding step, both widthwise ends of the protective sheet are projected from both widthwise ends of the expansion-absorbing material.