WO2017104364A1

WO2017104364A1 - Glass roll and method for manufacturing same

Info

Publication number: WO2017104364A1
Application number: PCT/JP2016/084671
Authority: WO
Inventors: 薫鑑継; 修二秋山; 直也石田
Original assignee: 日本電気硝子株式会社
Priority date: 2015-12-17
Filing date: 2016-11-22
Publication date: 2017-06-22
Also published as: CN108025880B; CN108025880A; TWI700255B; KR20180095497A; TW201733938A; JP6699159B2; JP2017109850A; KR102557121B1

Abstract

A glass roll (1) is configured by winding a glass film (9) onto a composite winding core (4) in which an expansion absorbing material (3) is wound around a winding core (2).

Description

Glass roll and method for producing the same

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

As is well known, thin display devices such as liquid crystal displays and organic EL displays, and mobile devices such as smartphones and tablet PCs that are rapidly spreading in recent years are required to be lightweight. Therefore, as a glass substrate employed in these devices, a glass film thinned into a film is practically used.

This glass film has a substantially rectangular shape at the final product stage, but is treated as a belt-like form at various processing steps including the previous manufacturing process.

Since this type of glass film has appropriate flexibility, it should be in the form of a glass roll wound around the core in consideration of convenience during handling, storage or transportation. Is customary. Thus, if it is set as the form of a glass roll, not only the handleability etc. of a glass film are excellent, but efficiency of work | work can be achieved also when performing various processes to a glass film.

For example, as described in Patent Document 1, this glass roll is formed of a thermoplastic resin such as vinyl chloride from the viewpoint of forming a core with a metal or reducing the weight. And the glass roll is manufactured by the tension | tensile_strength of a required winding direction being provided around this winding core, and winding up a glass film.

The glass roll manufactured in this way is packaged and shipped by a glass manufacturer or the like, and is carried into a device manufacturer or the like that manufactures the above various final products through long-distance transportation or the like.

Japanese Patent Laying-Open No. 2015-51912

By the way, when the glass roll is transported, not only the daily temperature change but also the temperature change can be caused by the regional difference between the glass manufacturer and the equipment manufacturer. Along with this, when the temperature of the glass roll rises, the following problems are caused.

That is, since the core of the glass roll is formed of a resin such as metal or vinyl chloride as described above, it has a characteristic that it easily expands due to a 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, when the diameter of the core increases with the temperature rise, tensile stress acts on the glass film, and when the tensile stress value becomes excessively large, the glass film is damaged. This glass film breakage may reach not only the inner layer portion around the core of the glass roll but also the outer layer portion.

Therefore, there is a problem that a glass roll manufactured as a non-defective product by a glass manufacturer or the like becomes defective and becomes unusable while being shipped and transported. Such a problem may occur in the same manner when a temperature rise occurs during the production or storage of a glass roll at a glass manufacturer or the like.

From the above viewpoint, an object of the present invention is to effectively avoid a situation in which a glass film is damaged when the diameter of the core increases with an increase in the temperature of the glass roll.

The glass roll according to the present invention created to solve the above problems is characterized in that a glass film is wound around a composite core in which an expansion absorbent is wound around the core. Here, “expansion absorption” means that the expansion of the core is absorbed so that the glass film does not stretch following the expansion (increase in diameter) of the core.

According to such a configuration, even if the diameter of the core increases due to the temperature rise of the glass roll, the glass film is wound on the outer peripheral side of the expansion absorbent material that is a component of the composite core. The increase in the diameter of the core is absorbed by the expansion absorbent and does not have a great influence on the glass film. In other words, when the diameter of the winding core increases, even if the glass film does not follow and expand, excessive tensile stress does not act on the glass film due to the expansion absorbing function of the expansion absorbent. As a result, breakage of the glass film is effectively avoided, and a non-defective glass roll can be maintained. From such a viewpoint, as the expansion absorbing material, a cushioning material or cushioning sheet having an expansion absorption function or a cushioning material or cushion sheet having an expansion absorption function with respect to a wound glass film can be used. Here, in order to be an expansion absorber, the characteristic that the thickness of the member changes by 0.5 mm or more when the compressive stress acting in the radial direction of the member changes due to the change in the diameter of the core due to the temperature change. It is preferable to have.

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

This makes it possible for the foamed resin sheet to sufficiently exhibit the expansion absorption function and appropriately prevent the glass film from being damaged due to the temperature rise of the glass roll. When the thickness of the foamed resin sheet is 2 to 7 mm, inhibition of the expansion absorption function due to the insufficient thickness is suppressed, and excessive quality due to the excessive thickness is also suppressed. That is, when the thickness of the foamed resin sheet is less than 2 mm, the expansion absorbing function may not be sufficiently exhibited. On the other hand, if the thickness of the foamed resin sheet exceeds 7 mm, the quality becomes excessive and the material is wasted. Therefore, if the thickness is within the above numerical range, such a problem can be avoided.

Further, 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 absorption function from the material surface. That is, if the expansion ratio of the foamed resin sheet is less than 25%, the flexibility tends to be too small and too hard, so excessive tensile stress is likely to extend the glass film following the increase in the diameter of the core. May act. On the other hand, if the expansion ratio of the foamed resin sheet exceeds 45%, the flexibility tends to increase and the film tends to be too soft. There is a possibility that the resin sheet is unduly compressed. Therefore, if the expansion ratio is within the above numerical range, such a problem can be avoided.

In the above configuration, the expansion absorber has a length corresponding to the entire circumferential length of the outer peripheral surface of the core and is wound around the core in a state where both ends in the circumferential direction are abutted. Is preferred.

In this way, since the expansion absorbent material can be prevented from overlapping in the circumferential direction to form a step, the glass film can be smoothly made around the composite core without causing undue deformation or undue bending stress. It can be wound. This makes it possible to more reliably prevent the glass film from being damaged due to an increase in the diameter of the winding core accompanying a temperature rise.

In the above configuration, the glass film may be wound around the composite core in a state where the glass film is connected to the leader.

In this way, the leader can be wound around the outer peripheral side of the expansion absorbent material and the inner peripheral side of the glass film. In this case, even if the glass film is connected to the leader, if the expansion absorbent is not wound around the core, if the glass roll rises in temperature, the glass film will be damaged. The inventors know as a result of research. And a leader is not connected with a glass film in order to exhibit the expansion | swelling absorption function with respect to expansion | swelling of a core, but is used in order to pull a glass film appropriately at the time of winding-up of a glass film. Therefore, even when the glass film is connected to the leader, the glass film cannot be prevented from being damaged due to the temperature rise of the glass roll unless the expansion absorbing function by the expansion absorbing material is exhibited. This means that even if a leader is present on the inner layer side of the glass film, the glass film can be prevented from being damaged only after the expansion absorbing function by the expansion absorbent material existing on the inner layer side of the leader is exhibited. To do.

In this case, the thickness of the expansion absorbent is preferably 20 to 140 times the thickness of the leader.

In this way, it is possible to appropriately obtain the effect of preventing the glass film from being damaged by the expansion absorbent material without causing enlargement of the glass roll due to the thick leader. Therefore, if the relationship between the thicknesses of the two is the above-mentioned value relationship, the expansion absorbent material will fully exhibit the expansion absorption function, and the leader will also fully exhibit its original function, that is, the function of properly pulling the glass film. can do.

In the above configuration, the glass film may be wound around the composite core in a state where the glass film is stacked on the protective sheet.

By doing so, the glass sheets are not brought into contact with each other by the protective sheet, and it is difficult to cause adverse effects such as scratching the glass film. In this case, even if the glass roll is wound around the core in a state where the glass film is overlaid on the protective sheet, if the expansion absorber is not fixed around the core, the glass roll As a result of research, the present inventors have known that the glass film is damaged when the temperature of the roll rises. And a protective sheet is not overlaid on a glass film for the purpose of expansion | swelling absorption, but is used in order to make a glass film hard to be damaged and to wind a glass film appropriately. Therefore, even when the glass film is stacked on the protective sheet, the glass film cannot be prevented from being damaged due to the temperature rise of the glass roll unless the expansion absorbing function by the expansion absorbent material is exhibited. This means that even if the protective sheet is present on the inner layer side of the glass fill, the glass film is prevented from being damaged only after the expansion absorbing function by the expansion absorbent material existing on the inner layer side of the protective sheet is exhibited. Means that.

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

In this way, it is possible to appropriately obtain the effect of preventing the glass film from being damaged by the expansion absorbent material without causing enlargement of the glass roll due to the thick protective sheet. Therefore, if the relationship between the thicknesses of the two is the relationship of the above numerical values, the expansion absorbent material sufficiently exhibits the expansion absorption function, and the protective sheet also has its original function, that is, the glass film is hardly damaged and the glass film. It is possible to sufficiently exhibit the function of imparting an appropriate tension to the.

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

If it does in this way, since the expansion | swelling absorber exists in the inner layer side of a glass film over the full width direction full length, while being able to obtain the stable winding state, the width direction full length with respect to a glass film A uniform expansion absorption effect over a wide range can be exhibited.

Moreover, it is preferable that both ends in the width direction of the expansion absorbent material protrude from both ends in the width direction of the leader.

In this way, since the expansion absorbent material exists over the entire length in the width direction on the inner layer side of the leader, a stable winding state is obtained, and the width direction with respect to the leader and thus the glass film is obtained. A uniform expansion absorption effect over the entire length can be exhibited.

Furthermore, it is preferable that both ends of the protective sheet in the width direction protrude from both ends of the expansion absorbent in the width direction.

In this way, when the flange is attached to both ends of the core, even if the glass film moves relatively close to the flange, the protective sheet first contacts the flange. And the contact between the expansion absorber and the flange are also avoided. Therefore, the glass film and the expansion absorber are appropriately protected.

In the above configuration, one end in the longitudinal direction of the leader can be fixed to the expansion absorbent.

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

In this case, one end of the protective sheet in the longitudinal direction can be fixed to the reader.

In this way, it is possible to shorten the winding length of the protective sheet and reduce its usage.

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

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

The glass roll manufacturing method according to the present invention, which was created to solve the above-mentioned problems, includes a core manufacturing process for manufacturing a composite core in which an expansion absorbent is wound around the core, and a glass film on the composite core. And a winding step of winding the wire.

According to such a configuration, since the winding process is first performed after the core manufacturing process is performed, not only the work efficiency is improved by the work segmentation, but also the manufacturing process is performed. As described above, the glass roll can sufficiently protect the glass film against the temperature rise by the function of the expansion absorbent.

According to the present invention, even if the diameter of the core increases with the temperature rise of the glass roll, breakage that can occur in the glass film is effectively prevented.

It is a perspective view which shows the whole structure (especially structure of a composite core) of the glass roll which concerns on embodiment of this invention. It is a single-piece | unit front view which shows the expansion | swelling absorber of the composite core which is a component of the glass roll which concerns on embodiment of this invention. It is a single-piece | unit side view which shows the expansion | swelling absorber of the composite core which is a component of the glass roll which concerns on embodiment of this invention. It is a principal part perspective view which shows the periphery structure of the composite core which is a component of the glass roll which concerns on embodiment of this invention. It is a schematic side view which shows the whole structure of the glass roll which concerns on embodiment of this invention. It is a vertical front view which shows the principal part structure of the glass roll which concerns on embodiment of this invention. It is a side view which shows the state in the middle of manufacture of the composite core which is a component of the glass roll which concerns on embodiment of this invention. It is a side view which shows the state after manufacture of the composite core which is a component of the glass roll which concerns on embodiment of this invention. It is a side view which shows the state in the middle of manufacture of the modification which concerns on the composite core which is a component of the glass roll which concerns on embodiment of this invention. It is a side view which shows the state after manufacture of the modification concerning the composite core which is a component of the glass roll which concerns on embodiment of this invention. It is a perspective view which shows the modification which concerns on the periphery structure of the composite core of the glass roll which concerns on embodiment of this invention. It is a side view which shows the modification which concerns on the periphery structure of the composite core of the glass roll which concerns on embodiment of this invention.

Hereinafter, a glass roll and a manufacturing method thereof according to an embodiment of the present invention will be described with reference to the accompanying 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 FIG. 1, the glass roll 1 includes a composite core 4 in which an expansion absorbent 3 is wound around the core 2. The expansion absorbent 3 prevents the expansion of the core 2 from being directly transmitted to the outer peripheral side when the diameter of the core 2 is increased by the expansion of the core 2 as the temperature of the glass roll 1 increases. Has an expansion absorbing function. As the expansion absorbing material 3, a cushioning material, a cushioning sheet, a cushioning material, or a cushion sheet having such an expansion absorbing function can be used. In this embodiment, a foamed resin sheet having such an expansion absorbing function is used. It has been. In this case, the foamed resin sheet 3 as the expansion absorbent material is preferably made of a polyethylene foamed resin or the like.

As shown in FIGS. 2a and 2b, the foamed resin sheet 3 as the expansion absorbent has a thickness T1 of 2 to 7 mm, preferably an upper limit of 6 mm and a lower limit of 3 mm, and a foaming ratio of 25. 45%, preferably the upper limit of the expansion ratio is 40% and the lower limit is 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 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. And the tape body 5 which consists of resin etc. which has an adhesive surface or an adhesive surface on both surfaces is affixed on the both ends of the length direction of the foamed resin sheet 3, respectively. In this case, the tape body 5 only needs to be attached to at least both ends in the length direction of the foamed resin sheet 3, and therefore one or more tape bodies are further attached to the intermediate portion in the length direction. Or various variations, such as sticking one tape body over the whole surface (all areas), are possible.

The foamed resin sheet 3 is fastened in a state of being wound around the core 2 by the tape body 5 (see FIG. 1). Therefore, the foamed resin sheet 3 is stuck so that it cannot be unwound from the outer peripheral surface 2 a of the core 2. The foamed resin sheet 3 is fastened around the core 2 in a state where both end portions in the length direction are abutted. In this case, the butted portions 6 at both ends in the length direction of the foamed resin sheet 3 are preferably in close contact, but a slight gap may be interposed. In this case, the gap is preferably 0.1 to 3 mm with respect to the circumferential direction.

In addition to the above-mentioned foamed resin sheet, the expansion absorbent material 3 may be a cushioning material or cushioning material made of polypropylene, polyvinyl chloride, or the like, but has a thickness or foaming ratio that exhibits an expansion absorption function. It is necessary to have the following characteristics.

The width dimension of the expansion absorbent material 3 (dimension in the direction parallel to the axis of the core 2) is 100 mm or more in this embodiment, but preferably 300 mm or more, and more preferably 500 mm or more. Is more preferable, and it is still more preferable that it is 1000 mm or more.

The material of the core 2 is not particularly limited. For example, metals such as aluminum alloy, stainless steel, manganese steel, and carbon steel, phenol resin, urea resin, melamine resin, unsaturated polyester resin, epoxy Thermosetting resins such as resin, polyurethane, direal terephthalate resin, thermoplastic resins such as polyethylene, polypropylene, polystyrene, AS resin, ABS resin, methacrylic resin, vinyl chloride, glass for these thermosetting resins and thermoplastic resins Reinforced plastics in which reinforcing fibers such as fibers and carbon fibers are mixed can be used. In this embodiment, vinyl chloride is used.

FIG. 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 drawings, the expansion absorbent 3 of the composite core 4 has a start end portion 7a of a winding start side leader (hereinafter referred to as a winding start side leader) 7 having an adhesive surface or an adhesive surface on one side. It is fixed by a tape body 8 made of resin or the like. The start end portion 9a of the glass film 9 is fixed to the terminal end portion 7b of the winding start side leader 7 by a pair of tape bodies 10 having the same configuration as described above, whereby the glass film 9 is connected to the winding start side leader 7. It is in the state. In addition, the end portion 9b of the glass film 9 is fixed to a start end portion 11a of a winding end leader (hereinafter referred to as a winding end side leader) 11 by a pair of tape bodies 12 having the same configuration as described above. The film end side leader 11 is connected to the film 9.

Further, the start end portion 13a of the protective sheet 13 is fixed to the expansion absorbent 3 of the composite core 4 by the tape body 14 having the same configuration as described above. The protective sheet 13 is fixed to the expansion absorbent material 3 so as to cover the start end portion 7 a of the winding start side leader 7, but the start end portion 13 a of the protection sheet 13 and the start end portion 7 a of the winding start side leader 7 are covered. May be fixed to the expansion absorbent material 3 by the

tape bodies

8 and 14 at the same location. In any case, the start end portion 13a of the protective sheet 13 and the start end portion 7a of the winding start side leader 7 are portions of the tape body 8 excluding the butted portions 6 at both ends in the length direction of the expansion absorbent material 3. , 14 are preferably fixed.

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, 100 μm or less, and further preferably 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. Moreover, although the width direction dimension of the glass film 9 is 100 mm or more in this embodiment, it is preferable that it is 300 mm or more among them, It is more preferable that it is 500 mm or more, It is still more preferable that it is 1000 mm or more.

The thickness and width of the winding start side leader 7 and the winding end side leader 11 are not particularly limited, but preferably have the same thickness and width as the glass film 9. Specifically, the thickness of these

leaders

7 and 11 is preferably 1 to 200 μm, and the width dimension is 100 mm or more in the present embodiment, but among them, it is preferably 300 mm or more. 500 mm or more, more preferably 1000 mm or more. The lengths of these

leaders

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

leaders

7 and 11, for example, polyethylene terephthalate film, ionomer film, polyethylene film, polypropylene film, polyvinyl chloride film, polyvinylidene chloride film, polyvinyl alcohol film, polyester film, polycarbonate 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, cellophane, etc. Organic resin films (synthetic resin films) can be used. Moreover, when using a metal film as these

leaders

7 and 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 is 10 μm or more or 20 μm or more. Moreover, although the width direction dimension of the protection sheet 13 is 100 mm or more in this embodiment, it is preferable that it is 300 mm or more among them, It is more preferable that it is 500 mm or more, It is still more preferable that it is 1000 mm or more. In this case, examples of the protective sheet 13 include 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, and a 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, cellophane and other organic resin films (synthetic resin) Film) and the like can be used.

FIG. 5 is a longitudinal front view showing in detail the main part of the glass roll 1. In addition, although the figure has shown only the one end part of the width direction of the glass roll 1, the other end part of the width direction of the glass roll 1 is also the same structure. As shown in the figure, the glass roll 1 is bonded to the glass film 9 and the glass film 9 in which the winding start side leader 7 and the winding end side leader 11 are connected around the expansion absorbent 3 of the composite core 4. The protective sheet 13 stacked without being wound is wound, and flanges 15 are fixed to both ends of the core 2.

And the width direction both ends 3x of the expansion absorbent material 3 protrude from the width direction both ends 7x and 11x of each of the winding start side leader 7 and the winding end side leader 11, and both the width direction ends of the glass film 9 It is also protruding from the part 9x. On the other hand, the width direction both ends 13x of the protective sheet 13 protrude from the width direction both ends 7x, 11x, 9x of the winding start side leader 7, the winding end side reader 11, and the glass film 9, respectively. Moreover, it protrudes from the width direction both ends 3x of the expansion absorbent material 3. In addition, it is preferable that the width direction dimension of the winding start side leader 7, the winding end side leader 11, and the glass film 9 is the same or substantially the same.

In this case, the width direction both ends 3x of the expansion absorbent material 3 may be aligned at the same position as the width direction both ends 9x of the glass film 9, and if small, the width direction both ends 9x of the glass film 9 are You may protrude from the width direction both ends 3x of the expansion absorbent material 3. Moreover, the width direction both ends 7x and 11x of each of the winding start side leader 7 and the winding end side leader 11 may be aligned at the same place as the width direction both ends 3x of the expansion absorbent material 3, and if slightly, The width direction both ends 7x and 11x of the winding start side leader 7 and the winding end side leader 11 may protrude from the width direction both ends 3x of the expansion absorbent material 3. In the example shown in the drawing, both end portions 13x in the width direction of the protective sheet 13 are not in contact with the flange 15, but they may be in contact with each other. Moreover, although the width direction both ends 3x of the expansion | swelling absorbent material 3 are not in contact with the flange 15 in the example of a figure, both may contact. When both are brought into contact with each other as described above, both end portions 3 x in the width direction of the expansion absorbent material 3 may protrude from both end portions 13 x in the width direction of the protective sheet 13.

Further, the thickness T1 of the expansion absorbent 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 start side leader 7 and the winding end side leader 11. ing. The relationship between the thickness T1 of the expansion absorbent 3 and the thickness T3 of the glass film 9 is also the same. Further, the thickness T1 of the expansion 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 the temperature rise of the glass roll 1, the glass film 9 is an expansion absorbent that is a component of the composite core 4. 3, the increase in the diameter of the core 2 is absorbed by the expansion absorbent 3 and does not significantly 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 along with it, excessive tensile stress does not act on the glass film 9 due to the expansion absorbing function of the expansion absorbent material 3. As a result, breakage of the glass film 9 is effectively avoided and the glass roll 1 as a non-defective product can be maintained. Furthermore, when a foamed resin sheet having a thickness of 2 to 7 mm and a foaming ratio of 25 to 45% is used as the expansion absorbent material 3, a sufficient expansion absorption function can be exhibited.

Moreover, the expansion absorbent material 3 has a length corresponding to the entire length in the circumferential direction of the outer peripheral surface 2a of the core 2 and is fastened around the core 2 in a state where the ends in the circumferential direction are abutted with each other. Therefore, it can prevent that the expansion | swelling absorber 3 overlaps in the circumferential direction, and a level | step difference is formed. As a result, the glass film 9 wound around the composite core 4 is less likely to be improperly deformed and inappropriate bending stress, and the glass film 9 is smoothly wound around the composite core 4. It will be. By this, it is possible to more reliably prevent the glass film 9 from being damaged due to an increase in the diameter of the core 2 due to the temperature rise.

Further, the glass roll 1 has a winding start side leader 7 and a protective sheet 13 wound around the inner layer side of the glass film 9. It is greatly different and the expansion absorbing function cannot be exhibited like the expansion absorbing material 3. Therefore, damage prevention of the glass film 9 accompanying the above-mentioned temperature rise is brought about by the expansion absorption function of the expansion absorbent material 3.

Furthermore, since this glass roll 1 (example shown in FIG. 5) has the width direction both ends 3x of the expansion absorber 3 protruding from the width direction both ends 9x of the glass film 9, the inner layer side of the glass film 9 The expansion absorbent material 3 exists over the entire length in the width direction. Therefore, while being able to obtain a stable winding state, it is possible to exhibit a uniform expansion absorbing function over the entire width direction with respect to the glass film 9.

Moreover, since this glass roll 1 (example shown in FIG. 5) has the width direction both ends 3x of the expansion absorber 3 projecting out from the width direction both ends 7x of the winding start side leader 7, the winding start side leader On the inner layer side of 7, the expansion absorbent material 3 exists over the entire length in the width direction. Also by this, a stable winding state can be obtained, and a uniform expansion absorbing effect can be exhibited over the entire width direction with respect to the winding start side leader 7 and thus the glass film 9.

Moreover, in the glass roll 1 (example shown in FIG. 5), the width direction both end portions 13x of the protective sheet 13 are the expansion absorbent material 3, the

leaders

7, 11 and the width direction both

end portions

3x, 7x, 11x of the protective sheet 13. Since it protrudes from 13x, even if the glass film 9 moves relatively close to the flange 15 due to vibration or impact during transportation, the protective sheet 13 first contacts the flange 15; And the flange 15 are avoided.

Next, the manufacturing method of the glass roll 1 provided with said structure is demonstrated. This manufacturing method is roughly divided into a core manufacturing process for manufacturing the composite core 4 and a winding process for winding the glass film 9 around the composite core 4 thereafter.

In the winding core manufacturing process, as shown in FIG. 6A, the expansion absorbent 3 is wound around the winding core 2 while leaving the longitudinal end portions 3y, and the expansion absorbent 3 is expanded and contracted. Adjust the height and position. After that, as shown in FIG. 6 b, both end portions 3 y in the length direction of the expansion absorbent material 3 are attached to the outer peripheral surface 2 a of the core 2 with the tape body 5. Thereby, the composite core 4 in which the expansion absorbent 3 is wound around the core 2 is obtained.

In the winding step, as shown in FIG. 3, the start end portion 7 a of the winding start side leader 7 and the start end portion 13 a of the protective sheet 13 are fixed to the expansion absorbent 3 of the composite core 4, and the winding start side In a state where the glass film 9 is connected to the leader 7, the winding start side leader 7, the protective sheet 13 and the glass film 9 are rolled around the composite core 4 while rotating the composite core 4 around the axis. Wind up. And when the glass film 9 is wound up to required length, it cut | disconnects along a width direction, connects the winding end side leader 11 to the cutting | disconnection edge part of the glass film 9, and winds up further in FIG. A glass roll 1 as shown is obtained.

As an example, this winding step is a glass film 9 that is formed by a molding apparatus such as a downdraw method or a float method and is continuously conveyed (for example, both ends in the width direction are cut off by laser cleaving during conveyance). Is wound around the composite core 4 together with the protective sheet 13 in the same manner as described above. As another example, after manufacturing the glass roll 9 as the original glass roll by winding the glass film 9 which is molded and continuously conveyed by the molding apparatus around the core having no expansion absorbent, It is performed by winding the glass film 9 together with the protective sheet 13 and the like around the composite core 4 by roll-to-roll from this original glass roll.

7a and 7b are schematic side views showing a modified example of the composite core 4 and the core manufacturing process. The composite core 4 is formed by winding the expansion absorbent material 3 having a laminated structure formed by bonding a plurality of sheet materials (three foamed resin sheets in the illustrated example) 3b, 3c, and 3d around the core 2. Is. The total thickness of the plurality of

sheet materials

3b, 3c, 3d is the same as the thickness T1 of the foamed resin sheet 3 described above. This modification is different from the above-described composite core 4 and core manufacturing process shown in FIGS. 6a and 6b only in that the expansion absorbent material 3 has a laminated structure. Elements are denoted by the same reference numerals and description thereof is omitted. According to this modification, even if the

sheet materials

3b, 3c, and 3d have thickness variations, there is an advantage that the thickness variation can be reduced by forming them in a laminated structure.

FIG. 8 is a schematic perspective view showing a modified example of the mounting structure of the winding start side leader 7 and the protective sheet 13 with respect to the composite core 4, and FIG. 9 is a schematic side view showing the glass roll 1 according to the modified example. It is. As shown in these figures, the start end portion 7a of the winding start side leader 7 is fixed to the expansion absorbent 3 of the composite core 4, and the longitudinal direction intermediate portion (winding start side reader 7) of the winding start side reader 7 is fixed. The end portion 13a of the protective sheet 13 is fixed to the end portion 7b of the protective sheet 13 by a tape body 14. Since the other components are the same as those of the glass roll 1 shown in FIGS. 3 and 4 described above, the same reference numerals are given to the components common to both, and the description thereof is omitted. According to this modification, since the protective sheet 13 can be made short, there is an advantage that the usage amount can be reduced and the cost can be reduced.

In the above embodiment, the protective sheet 13 is wound around the composite core 4 without being bonded to the glass film 9, but instead, the protective sheet 13 is a glass film as a laminate film. It is good also as a structure wound around the composite core 4 in the state affixed on 9. Further, in such a case, the glass sheet 9 to which the laminate film is attached is wound around the composite core 4 in a state where a separate protective sheet is laminated without being bonded. It is good also as a structure.

Moreover, in the above embodiment, the expansion absorbent 3 of the composite core 4 is in a state in which both ends in the length direction are abutted, but the core in a state in which both ends in the length direction are overlapped. It may be wound around 2. In that case, in order to prevent a large level difference from occurring on the outer peripheral surface of the expansion absorbent material 3, the thickness of the end face of the outermost layer of the expansion absorbent material 3 is gradually reduced as it moves to the end side. It is preferable to form it as follows.

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 is wound around the core 2. However, a cylindrical sheet made of foamed resin or the like is used. It is good also as a structure which fits and winds a material to the core 2. As shown in FIG.

1 Glass roll 2 Core 3 Expansion absorbent material (foamed resin sheet)
3x Expansion Absorbent Width Direction End 4 Composite Core 6 Expansion Absorbent Butt 7 Leader (winding side leader)
7x Leader width direction end 9 Glass film 9x Glass film width direction end 13 Protective sheet 13x Protective sheet width direction end 15 Flange

Claims

A glass roll in which a glass film is wound around a composite core in which an expansion absorber is wound around the core.
The glass roll according to claim 1, wherein the expansion absorbing material is a foamed resin sheet having a thickness of 2 to 7 mm.
The glass roll according to claim 1 or 2, wherein the expansion absorbent material is a foamed resin sheet having a foaming ratio of 25 to 45%.
The said expansion | swelling absorber has the length corresponding to the circumferential direction full length of the outer peripheral surface of the said core, and is wound around the said core in the state which both ends of the circumferential direction were faced | matched. The glass roll according to any one of 1 to 3.
The glass roll according to any one of claims 1 to 4, wherein the glass roll is wound around the composite core while being connected to a leader.
The glass roll according to any one of claims 1 to 5, wherein the glass roll is wound around the composite core in a state of being overlaid on a protective sheet.
The glass roll according to any one of claims 1 to 6, wherein both ends in the width direction of the expansion absorbent material protrude from both ends in the width direction of the glass film.
The glass roll according to any one of claims 5 to 7, wherein both ends in the width direction of the expansion absorbent material protrude from both ends in the width direction of the leader.
The glass roll according to any one of claims 6 to 8, wherein both ends in the width direction of the protective sheet protrude from both ends in the width direction of the expansion absorbent material.
The glass roll according to any one of claims 5 to 9, wherein one end portion in the longitudinal direction of the leader is fixed to the expansion absorbent material.
The glass roll according to claim 10, wherein one end of the protective sheet in the longitudinal direction is fixed to the leader.
The glass roll according to any one of claims 6 to 10, wherein one end portion in the longitudinal direction of the protective sheet is fixed to the expansion absorbent material.
A method of manufacturing a glass roll, comprising: a core manufacturing process for manufacturing a composite core in which an expansion absorber is wound around a core; and a winding process for winding a glass film around the composite core. .