WO2015118985A1

WO2015118985A1 - Glass roll

Info

Publication number: WO2015118985A1
Application number: PCT/JP2015/052033
Authority: WO
Inventors: 伊藤　昌宏; 弘賢山本; 聡白鳥; 哲哉小山; 杉山　徳英; 小金澤　光司; 良太中島
Original assignee: 旭硝子株式会社
Priority date: 2014-02-06
Filing date: 2015-01-26
Publication date: 2015-08-13
Also published as: JPWO2015118985A1; TW201538313A

Abstract

[Problem] To provide a glass roll in which the blocking between of layers of a glass sheet and the contamination of the glass sheet are inhibited. [Solution] A glass roll produced by winding a resin-coated glass sheet obtained by forming a resin coating on one of the surfaces of a glass sheet, wherein: the glass sheet has a thickness of 10 to 300μm; and the resin-coated glass sheet is in such a laminated and wound state that the resin coating surface of a layer is in contact with the glass surface of other layer.

Description

Glass roll

The present invention relates to a glass roll.

A display device such as a liquid crystal display or a semiconductor element is provided with a cover glass to protect the surface. In recent years, with the miniaturization and weight reduction of display devices and semiconductor elements, the glass sheets used for these devices have been made extremely thin. Since the glass sheet thinned in this way has flexibility, it may be wound around the outer periphery of the core to be packed, conveyed, etc. in the state of a glass roll.

Here, the strength of the glass sheet is reduced and the glass sheet is easily damaged. In addition, when the glass surfaces are in close contact with each other, the glass sheets may be blocked and may be damaged by applying a local force when the glass sheets are fed out.

Therefore, a glass roll configured to protect the glass sheet and to prevent the glasses from contacting each other by wrapping a protective film on the glass sheet is disclosed (for example, see Patent Document 1 or 2).

JP 2013-7981 A JP 2011-201765 A

However, when a protective film is stacked on the glass sheet, there is a possibility that the glass sheet is contaminated by volatilized material or fallen material from the protective film. Moreover, there exists a possibility of causing the increase in cost by using a protective film.

The present invention has been made in view of the above, and an object thereof is to provide a glass roll in which blocking between glass sheets and contamination of the glass sheets are prevented.

According to one aspect of the present invention, there is provided a glass roll in which a glass sheet with a resin coating film in which a resin coating film is formed on one side of the glass sheet, the glass sheet having a thickness of 10 to 300 μm. The glass sheet with a resin coating film is laminated and wound so that the resin coating film surface and the glass surface of another layer are in contact with each other.

According to the embodiment of the present invention, a glass roll in which blocking between glass sheets and contamination of the glass sheet are prevented can be provided.

It is a figure which illustrates the glass roll in embodiment. It is the schematic explaining a test method.

In the following description, the state where “blocking” has occurred is necessary to peel the glass sheet from the glass roll when the glass sheet is unwound at a constant speed from the glass roll wound around the winding core. The state where the strong force (peeling force) is not constant. Specifically, the inner surface of the glass sheet to be unwound (the surface facing the inner side (winding core side) of the glass roll) is an adjacent glass sheet (one turn of the glass sheet to be unwound from the glass roll). It means a state in close contact with the outer surface of the glass sheet located on the inner side (the surface facing the outer side of the glass roll (the side opposite to the winding core side)).

When blocking occurs, the peeling force for eliminating this close contact state locally increases. If the peeling force is locally increased, it will hinder the stable conveyance of the glass sheet. Specifically, “flutter” is likely to occur immediately after unwinding, and as a result, problems such as uneven tension, uneven transport speed, and misalignment are likely to occur. Further, when the peeling force becomes extremely large, the glass sheet is damaged.

The peeling force depends on the unwinding speed, the combination of the two materials to be in close contact, the surface roughness, the tension during winding, the elapsed time after winding the glass roll, and the like. Further, the locally increasing peeling force means that the surface characteristics of the surface where the peeling force is increased are different from those of the surroundings, and in general, it tends to cause defects by subsequent processing. Since various problems occur in this way, it is important that the glass roll can be unwound with low peeling force without blocking.

In the following description, “surface roughness (roughness)” means arithmetic average roughness (Ra) defined in JIS B0601.

Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings. In the drawings, the same components are denoted by the same reference numerals, and redundant description may be omitted.

<Glass roll>
FIG. 1 is a diagram illustrating a glass roll 100 in the embodiment.

In the glass roll 100, a glass sheet 13 with a resin coating film 12 having a resin coating film 12 formed on one side of the glass sheet 11 is rolled on the outer periphery of the core 20 without interposing a protective film or a slip sheet. It is formed by being wound around. In the glass roll 100, the glass sheet 13 with a resin coating film is laminated so that the resin coating film surface and the glass surface of the other layer are in contact with each other because no protective film or slip paper is interposed. . In the example shown in FIG. 1, the glass sheet 13 with a resin coating film is wound so that the glass surface is on the inner peripheral surface side and the resin coating film surface is on the outer peripheral surface side. It may be wound so that it becomes the surface side and the resin coating film surface becomes the inner peripheral surface side. Since the glass sheet 13 with a resin coating film is not easily damaged, the glass roll 100 is preferably wound so that the glass surface is on the inner peripheral surface side and the resin coating film surface is on the outer peripheral surface side.

The glass roll 100 is formed of a glass sheet 13 with a resin coating film when unwound on a support means provided so that the transition length is 500 mm after a lapse of one week after the glass sheet 13 with a resin coating film is wound. The runout width is preferably within 20 mm, more preferably within 10 mm, and particularly preferably within 5 mm. According to this embodiment, since blocking is suppressed, “flapping” immediately after unwinding of the glass sheet 13 with a resin coating film is suppressed. Moreover, 0.08% or less is preferable, as for the conveyance speed fluctuation | variation of the glass sheet 13 with a resin coating film originating in flapping, 0.02% or less is more preferable, and 0.005% or less is especially preferable.

Evaluation of fluttering is performed, for example, by the following method. The glass sheet 13 with a resin coating film is wound up without using an interleaf paper to obtain a glass roll 100. The winding tension is 1 N per 10 mm sheet width. The obtained glass roll 100 is stored for one week. The storage conditions are a temperature of 20 to 25 ° C. and a humidity of 30 to 80% relative humidity. The transition length is 500 mm. Here, the transition length is the distance from the peeling point at which the glass sheet 13 with a resin coating film peels from the glass roll 100 to the point at which the unwound glass sheet 13 with a resin coating film is supported by the support means. . The support means is, for example, a roll or a turn bar. The vibration of the surface direction of the glass sheet 13 with a resin coating film is controlled by the point supported.

The unwinding conditions of the glass sheet with a resin coating film are a tension of 1 N per 10 mm of the sheet width and a speed of 10 m / min. If fluttering occurs, the sheet vibrates in the surface direction at a place where the glass sheet having the transition length is not supported (approximately in the vicinity of the middle of the transition length). The maximum value of the swing width is measured and set as the “flapping” value.

<Glass sheet>
The material and composition of the glass sheet 11 are not limited. For example, soda lime glass, alkali-borosilicate glass, non-alkali-borosilicate glass, non-alkali-aluminosilicate glass, or the like can be used. Of these, alkali-free borosilicate glass and alkali-aluminosilicate glass are preferable in terms of excellent durability, high elastic modulus, and low linear expansion coefficient. In addition, alkali-free borosilicate glass and alkali-aluminosilicate glass (hereinafter referred to as “alkali-free glass”) are preferable because when a semiconductor element is formed on the glass, an element defect due to alkali does not occur. . The alkali-free glass refers to a glass having an alkali metal oxide content of less than 1 mol% (may be 0 mol%) when the glass composition is represented by an oxide.

The thickness of the glass sheet 11 is 10 to 300 μm. If the thickness is less than 10 μm, even if the resin coating film 12 is formed, the impact resistance becomes insufficient, and it may be easily damaged, which is not preferable. Moreover, when thickness exceeds 300 micrometers, the softness | flexibility of the glass sheet 13 with a resin coating film may be insufficient, and it is unpreferable. The thickness of the glass sheet 11 is more preferably 10 to 200 μm, and particularly preferably 20 to 100 μm.

Further, the thickness of the glass sheet 11 is preferably uniform. Specifically, the thickness deviation is 15% or less in terms of PV (Peak to Valley) value (for example, the deviation with respect to the thickness of 100 μm). Is preferably 15 μm or less. When the thickness is uniform, the appearance of the glass sheet 11 is improved.

The surface of the glass sheet 11 is preferably flat. The flatter the glass sheet 11, the higher the light transmittance, and the surface roughness is preferably 30 nm or less, more preferably 1 nm or less, in terms of arithmetic average roughness (Ra). Moreover, it is preferable that the surface of the glass sheet 11 is flat because when the electrode such as a transparent conductive film is laminated on the surface, the film resistance becomes uniform and defects are hardly generated.

The dielectric constant of the glass sheet 11 is preferably 5 to 7 at 10 kHz. The Young's modulus of the glass sheet 11 is preferably 70 to 95 GPa, more preferably 75 to 90 GPa.

The linear expansion coefficient of the glass sheet 11 is preferably 3 × 10 ⁻⁶ to 5 × 10 ⁻⁶ / ° C. (3 to 5 ppm / ° C.) at 0 to 200 ° C. The glass sheet 11 having these characteristics is suitable as a photoelectric conversion element, a protective plate such as a display member, a substrate of a semiconductor device, and the like.

The glass sheet 11 may be subjected to a tempering process. As the strengthening treatment, chemical strengthening is preferable. If it is chemical strengthening, the thin glass sheet 11 can be effectively strengthened. When the glass sheet 11 is subjected to the tempering treatment, an effect is obtained that the glass sheet 11 with a resin coating film is not easily damaged even if the glass sheet 11 is thin and lightweight.

<Resin coating film>
The resin coating 12 formed on the glass sheet 11 preferably contains a fluororesin. When the resin coating film 12 contains a fluororesin, the adhesion between the glass and the resin of the glass sheet 13 with a resin coating film to be laminated is suppressed, the peeling force is easily suppressed, and contamination of the glass surface is easily suppressed. . The resin coating 12 prevents blocking caused by the glass sheets 11 coming into contact with each other in the glass roll 100. Moreover, the surface of the glass sheet 11 is protected and the surface is prevented from being scratched or broken. Moreover, when the glass sheet 11 is broken, it is prevented that fragments are scattered.

(Fluorine resin)
By including the fluororesin described below, the resin coating film 12 forms a glass sheet 13 with a resin coating film that is excellent in durability, weather resistance, water repellency, antifouling properties, transparency, and the like.

The fluororesin in the present invention means a fluororesin selected from the group consisting of a cured product of a solvent-soluble curable fluororesin, a solvent-soluble fluororesin, and a mixture thereof. The “solvent-soluble curable fluororesin solution” and the “solvent-soluble fluororesin solution” may be collectively referred to as “fluororesin solution”. Here, the solvent solubility is not limited to a case where a solution in a strict sense can be obtained, but includes a state where a stably dispersed state can be maintained. Moreover, the state in which some turbidity is seen in a solution state may be sufficient. Furthermore, it is preferable that the fluororesin solution is filtered. In particular, it is preferable to use a filter paper having a nominal opening of 5 μm or less because a smooth resin coating film 12 can be obtained by removing foreign substances.

The fluorine content of the fluororesin is preferably 5% by mass or more, and more preferably 10% by mass or more. A high fluorine content is preferable in that the water absorption rate and relative dielectric constant of the resin are lowered, and the reliability and durability when an element is formed are increased. The upper limit of the fluorine content is preferably 76% by mass or less and more preferably 70% by mass or less because it is easy to make a solution. Here, the fluorine content is the proportion of the molecular weight occupied by fluorine atoms, and is usually calculated based on the chemical formula of the monomer. When a plurality of polymers are mixed and used, the fluorine content is calculated from the mixing ratio (mass ratio) thereof.

Specific examples of the fluororesin (polymer) include a fluorinated olefin polymer and a fluorinated diene compound cyclized polymer. Fluorinated olefins include vinyl fluoride, vinylidene fluoride, trifluoroethylene, chlorotrifluoroethylene, tetrafluoroethylene, hexafluoropropylene, fluoroalkyl (meth) acrylate, fluoroalkyl vinyl ether, perfluoro (alkyldioxole), etc. Is mentioned. Examples of the fluorine-containing diene compound that can be cyclopolymerized include perfluoro (allyl vinyl ether) and perfluoro (butenyl vinyl ether).

These polymers may be homopolymers of the aforementioned monomers (such as fluorine-containing olefins) or copolymers. In the case of a copolymer, it may be a copolymer of the above fluorine-containing olefin and the like and a monomer not containing a fluorine atom. Examples of the monomer not containing a fluorine atom include olefins, vinyl ethers such as alkyl vinyl ether, vinyl esters such as alkyl vinyl ester, and (meth) acrylates such as alkyl (meth) acrylate. Moreover, the monomer which does not contain a fluorine atom may be a compound having a reactive group such as a hydroxyl group. “(Meth) acrylate” is a combination of acrylate and methacrylate.

Solvent-soluble fluororesins include vinylidene fluoride homopolymers or copolymers, cyclic fluorine-containing monomers such as perfluoro (alkyldioxole) (carbons in which the carbon atoms of the polymerizable unsaturated groups constitute the ring) (Monomers that are atoms) homopolymers or copolymers, homopolymers or copolymers of fluorinated diene compounds that can be cyclopolymerized, copolymers of tetrafluoroethylene and vinyl alcohol, fluoroalkyl (meta And a copolymer of acrylate and (meth) acrylates containing no fluorine atom. The homopolymer or copolymer of the cyclic fluorine-containing monomer and the homopolymer or copolymer of the fluorine-containing diene compound capable of cyclopolymerization are polymers having a ring structure in the main chain (mainly A polymer in which a part of the carbon atoms of the chain is a carbon atom constituting a ring).

Solvent-soluble fluororesins include homopolymers of vinylidene fluoride, copolymers of perfluoro (dimethyldioxole) and tetrafluoroethylene, cyclized polymers of perfluoro (butenyl vinyl ether), and tetrafluoroethylene and vinyl. A copolymer with alcohol is preferable, and a homopolymer of vinylidene fluoride and a cyclized polymer of perfluoro (butenyl vinyl ether) are particularly preferable. The homopolymer of vinylidene fluoride is a polymer that can be crosslinked by heat treatment, but in the present invention, it is a solvent-soluble fluororesin (not a curable fluororesin).

Examples of the solvent-soluble curable fluororesin include copolymers of chlorotrifluoroethylene or tetrafluoroethylene and alkyl vinyl ethers having a curable functional group such as a hydroxyl group, and fluorine-containing arylene ethers having a polymerizable functional group such as a vinyl group. A polymer etc. are mentioned. Alternatively, the copolymer of tetrafluoroethylene and vinyl alcohol can be reacted with an alkyl silicate oligomer to obtain a curable fluororesin.

The curable fluororesin having a reactive group can be made into a cured product using a compound having a functional group that reacts with the reactive group as a curing agent or a crosslinking agent. For example, a curable fluororesin having a hydroxyl group can be made into a cured product with a curing agent having an isocyanate group. In addition, a fluororesin having a polymerizable functional group such as a vinyl group can be cured with a radical generator or the like.

Examples of the solvent-soluble curable fluororesin include a hydroxyl group-containing fluororesin composed of a copolymer of chlorotrifluoroethylene and a hydroxyl group-containing vinyl ether, or a copolymer of tetrafluoroethylene and vinyl alcohol with an alkyl silicate oligomer. And a fluorinated arylene ether polymer having a vinyl group, particularly preferably a fluorinated arylene ether polymer having a vinyl group.

The glass transition temperature of the fluororesin is preferably 200 ° C. or lower, and more preferably 150 ° C. or lower. When the glass transition temperature is low, stress hardly remains in the resin coating film 12, and the warp of the glass sheet 13 with the resin coating film is suppressed, and flatness is maintained. The transmittance of the fluororesin is preferably 80% or more and more preferably 90% or more in the wavelength range of 400 to 700 nm.

<Glass sheet with resin coating>
The glass sheet 13 with a resin coating film in which the resin coating film 12 is formed on one side of the glass sheet 11 preferably has a light transmittance of 80% or more at a wavelength of 400 to 700 nm, more preferably 90% or more. Preferably, it is 93% or more. It is preferable that the glass sheet 13 with a resin coating film is transparent in the said wavelength range, ie, the range of visible light. Since the glass sheet 13 with a resin coating film has transparency, it can be used, for example, as a protective plate disposed on the front surface of the display device. Further, for example, when used as a base material for a light emitting element, a power generation element, etc., the light emission efficiency and the power generation efficiency are not lowered.

Further, the thickness of the glass sheet 13 with a resin coating film is preferably uniform because the appearance is good. Specifically, the standard deviation of the thickness is preferably 50% or less, and more preferably 35% or less.

The thickness of the resin coating film 12 is preferably 0.1 to 1000 μm, more preferably 0.1 to 500 μm, and particularly preferably 1 to 20 μm. Further, the thickness of the resin coating film 12 is preferably 0.001 to 10 with respect to the thickness of the glass sheet 11 when the thickness of the glass sheet 11 is 1, and is 0.01 to 5 More preferably, 0.1 to 1 is particularly preferable.

The surface roughness of the resin coating film 12 is an arithmetic average roughness (Ra), preferably 0.1 to 35 nm, more preferably 0.3 to 30 nm, and particularly preferably 0.3 to 20 nm. In general, it is preferable to increase the surface roughness in order to suppress blocking. As a method for roughening the surface roughness, in general, a method of containing a filler such as inorganic particles in the resin coating film 12, and applying a resin to the surface using a mold such as a roll mold after applying the resin. And the like. However, when the filler is contained in the resin, there is a problem that the filler falls off from the resin coating film. Moreover, when using a shaping | molding die, when providing an unevenness | corrugation, the glass sheet 11 may be damaged. Furthermore, there is a possibility of scratching the glass surface when the irregularities are imparted. Scratches tend to cause damage in later processes. For this reason, in this invention, the surface roughness of the resin coating film 12 is the said range, and it is preferable that it is smooth. Moreover, it is preferable that the resin coating film 12 does not contain a filler. If it is this embodiment, even if the resin coating film 12 is smooth, blocking can be suppressed.

<Method for producing glass sheet with resin coating>
The resin coating film 12 of the glass sheet 13 with a resin coating film is formed by, for example, directly applying a resin solution to the glass sheet 11. The direct application method is preferable because the surface of the resin coating film 12 tends to be flat. Alternatively, for example, a resin solution may be applied to another substrate to form the resin coating film 12, and the formed resin coating film 12 may be transferred to the glass sheet 11.

In this embodiment, a resin coating is formed by applying a resin solution to one side of the glass sheet 11 and then removing the solvent. When the resin solution is a curable fluororesin solution, the curable fluororesin is cured after removing the solvent to form the cured fluororesin resin coating 12.

(Resin solution)
The resin solution is not limited as long as it contains any of the resins described above and can be applied to the glass sheet 11. For the resin solution, the resin may be dissolved in a solvent, or the resin may be synthesized in a solvent and used. In addition, the resin solution may contain components other than the resin and the solvent. For example, when a fluororesin is used, the resin solution reacts with the resin when forming a coating film, such as silanes such as alkoxysilane and alkylsilicate oligomer. May be included.

The solid content of the resin solution is preferably 0.1 to 70% by mass, and preferably 1 to 15% by mass. However, solid content means the ratio by which the solid content obtained by drying a solution is contained in the whole solution. For example, 1 g of the solution can be put in an aluminum cup and dried in an oven at 100 ° C. for 10 minutes for measurement. The solvent used in the resin solution is not particularly limited as long as it can dissolve the resin, and the boiling point is preferably 50 to 300 ° C, more preferably 100 to 250 ° C.

(Application of resin solution)
When the resin solution is applied to the glass sheet 11, the surface suitability improvement treatment of the glass sheet 11 may be performed. Examples of the surface suitability improving process include a cleaning process and an adhesion improving process. Examples of the cleaning treatment include water cleaning, water vapor cleaning, solvent cleaning, UV / ozone cleaning, and the like. Examples of the adhesive improvement treatment include corona treatment and primer treatment. As a primer used for the primer treatment, for example, aminosilanes and epoxysilanes can be used.

The method for applying the resin solution is not particularly limited. Examples of the coating method include dip coating, die coating, slit coating, spray coating, electrospray coating, ink jet coating, flexographic coating, and gravure coating. The application of the resin solution may be performed once or may be performed in a plurality of times.

After the resin solution is applied to the glass sheet 11, the resin coating film 12 is obtained by removing the solvent from the resin solution layer. When the resin solution contains a curable fluororesin, the curable fluororesin is cured to be a cured fluororesin almost simultaneously with the removal of the solvent or after the solvent is removed. The removal of the solvent is performed, for example, by heating the resin solution layer to the boiling point of the solvent or higher to evaporate and remove the solvent. When the resin solution contains a curable fluororesin, the thermosetting curable fluororesin can be cured almost simultaneously with heating. Further, after the solvent is removed, it can be further heated and cured.

Various methods can be used as a method for producing the glass sheet 13 with a resin coating film, but when the long glass sheet 11 is used as in the present embodiment, a continuous method is suitable. In the continuous method, after performing the surface appropriateness improvement treatment as necessary, the resin solution is applied and heated (solvent removal) continuously, and the resulting glass sheet 13 with a resin coating film is wound into a roll. It is a method of collecting.

<Example>
Specific examples will be described below, but the present invention is not limited to these examples.
(material)
Tests were conducted under the conditions shown in Examples 1 and 2 and Comparative Examples 1 to 4 using the following materials.

Glass sheet: A non-alkali glass (trade name: AN100) glass sheet manufactured by Asahi Glass Co., Ltd. (a long ribbon having a thickness of 50 μm and a width of 300 mm (length is 20 m or more)) was used.

Fluorine resin 1: N-methylpyrrolidone (NMP) solution (solid content: 12% by mass) of polyvinylidene fluoride (Kureha, KF-1120, fluorine content: 59.4% by mass) and fluororesin solution A1 did.

-Fluororesin _2: Cyclopolymerization of perfluorobutenyl vinyl ether (CF ₂ = CFOCF ₂ CF ₂ CF = CF ₂ ) using diisopropyl peroxydicarbonate (((CH ₃ ) ₂ CHOCOO) ₂ ) as a polymerization initiator . The unstable terminal derived from the initiator was converted to —COF by heat treatment and then hydrolyzed to —COOH. Poly (perfluoro (butenyl vinyl ether)) was obtained. The intrinsic viscosity [η] of this polymer measured with a perfluoro (2-butyltetrahydrofuran) solution was 0.23. The fluorine content was 68.3% by mass. This polymer was dissolved in perfluorotributylamine to obtain a fluororesin solution A2 (solid content: 14% by mass).

PET1: Polyester film manufactured by Toyobo Co., Ltd. (biaxially stretched polyethylene terephthalate resin, product name: ester film E5000, thickness: 50 μm, width 350 mm)
PET2: Polyester film manufactured by Toyobo Co., Ltd. (biaxially stretched film of polyethylene terephthalate resin, trade name: Cosmo Shine A4100, thickness: 50 μm, width 350 mm)
Example 1
The glass sheet was thoroughly washed and dried, and the fluororesin solution A1 was applied to one side and dried. The thickness of the resin coating film was 1 μm. The obtained glass sheet with a resin coating film was wound on a core having a diameter of 400 mm to obtain a glass roll, with the resin coating film as the outer surface, the tension at 300 mm width was adjusted to 30N. A lead film (PET1) having a width of 350 mm was attached to the unwinding end using an adhesive tape and wound up. After winding, it was fixed with an adhesive tape so that the end would not loosen. After that, the core was fixed on the glass plate so that the weight of the core was not applied to the glass frame, and stored for a predetermined time (1 day, 7 days). The storage conditions were a temperature of 23 ° C. and a humidity of 50% relative humidity.

After storing for a predetermined time (1 day, 7 days), an unwinding test for evaluating the fluttering of the glass sheet with a resin coating film when unwinding from the glass roll was performed.

FIG. 2 is a schematic diagram for explaining the unwinding test. As shown in FIG. 2, the unwinding test is performed using a sample glass roll 110, a winder 120, and a guide roll 130 as a support means.

The glass roll 110 is attached to an unwinding machine and rotates to unwind the glass sheet 140 with a resin coating film. A winder 120 having a winding core with a diameter of 400 mm provided at a position approximately 2 m away from the glass roll 110 winds up and collects the glass sheet 140 with a resin coating film unwound from the glass roll 110.

The guide roll 130 has a diameter of 300 mm, and is provided between the glass roll 110 and the winder 120 and at a position where the transition length L is 500 mm. The guide roll 130 is provided so that the upper end is located 30 mm above a straight line connecting the upper end of the winding core of the unwinding machine 120 and the upper end of the winding core of the winding machine.

In the above configuration, the glass sheet 13 with a resin coating film is unwound from the glass roll 110 at a tension of 30 N and a speed of 10 m / min, and the glass sheet 13 with a resin coating film flutters between the glass roll 110 and the guide roll 130. The runout width W was observed.

The fluctuation width W of the fluttering of the glass sheet with a resin coating film unwound from the glass roll after storage for 1 day and after storage for 7 days was less than 1 mm, and no blocking occurred. Moreover, about the glass roll after storing for seven days, when the surface of the glass which was in contact with the resin coating film (fluororesin 1) was observed visually, contamination etc. did not generate | occur | produce. The surface roughness of the resin coating film before winding was 19 nm.

(Example 2)
In Example 1, the test was performed in the same manner as in Example 1 except that the fluororesin solution A2 was used instead of the fluororesin solution A1. The thickness of the resin coating film was 1 μm.

In the unwinding test, the fluctuation width of fluttering was less than 1 mm after 1 day storage and after 7 days storage, and no blocking occurred. Moreover, about the glass roll after storing for seven days, when the surface of the glass which was in contact with the resin coating film (fluororesin 1) was observed visually, contamination etc. did not generate | occur | produce. The surface roughness of the resin coating film before winding was 7 nm.

(Comparative Example 1)
In Example 1, instead of applying the fluororesin solution A1, a glass roll was formed by winding a glass sheet on which nothing was applied, and the test was performed in the same manner as in Example 1.

The swinging fluctuation in the unwinding test was 20 mm or more after 1 day storage and after 7 days storage, and the glass sheet was broken only after unwinding several meters, and the test could not be continued. Moreover, the surface roughness of the glass sheet after washing was 7 nm.

(Comparative Example 2)
In Example 1, instead of applying the fluororesin solution A1, a resin film (PET1) was wound together with a glass sheet to form a glass roll, and the test was performed in the same manner as in Example 1. The glass sheet and the resin film were unwound together according to Example 1.

In the unwinding test, the fluctuation width of fluttering was less than 1 mm after 1 day storage and after 7 days storage, and no blocking occurred. Moreover, about the glass roll after storing for 7 days, when the surface of the glass which was in contact with the resin film (PET1) was observed visually, slight cloudiness was recognized. The cloudiness could be removed by wiping with acetone. This cloudiness is considered to be an oligomer that is a degradation product of polyester. Further, the surface roughness of the resin film before winding was 46 nm.

(Comparative Example 3)
In Comparative Example 2, instead of PET1, a resin film (PET2) was wound together with a glass sheet to form a glass roll, and the test was performed in the same manner as in Example 1. However, the rough surface of the resin film (PET2) was taken as the outer surface. The glass sheet and the resin film were unwound together according to Example 1. That is, unwinding was performed so that peeling occurred between the rough surface of the resin film and the glass sheet.

The swinging fluctuation width in the unwinding test was less than 1 mm after storage for 1 day and after storage for 7 days, and no blocking occurred. Moreover, about the glass roll after storing for 7 days, when the surface of the glass which was in contact with the resin film (PET2) was observed visually, slight cloudiness was recognized. The cloudiness could be removed by wiping with acetone. This cloudiness is considered to be an oligomer that is a degradation product of polyester. The surface roughness of the resin film before winding was 37 nm.
(Comparative Example 4)
In Comparative Example 3, the surface of PET 2 was turned upside down, a glass roll was formed with the smooth surface as the outer surface, and the test was performed in the same manner as in Example 1. The glass sheet and the resin film were unwound together according to Example 1. That is, it was unwound so that peeling occurred between the smooth surface of the resin film and the glass sheet.

In the unwinding test, the fluctuation width of fluttering was 8 mm after storage for 1 day and 12 mm after storage for 7 days, and blocking occurred. Moreover, about the glass roll after storing for 7 days, when the surface of the glass which was in contact with the resin film (PET2) was observed visually, slight cloudiness was recognized. The cloudiness could be removed by wiping with acetone. This cloudiness is considered to be an oligomer that is a degradation product of polyester. Moreover, the surface roughness of the resin film before winding was 22 nm.

Table 1 below shows the unwinding test results of Examples 1-2 and Comparative Examples 1-4.

The evaluation results A to D of the swing width shown in Table 1 are as follows.
A: The deflection width was less than 1 mm, blocking did not occur, and it was possible to smoothly unwind.
B: The runout width was 1 mm or more and less than 10 mm, slight blocking occurred, and smooth unwinding was difficult.
C: The runout width was 10 mm or more and less than 20 mm, relatively strong blocking occurred, and smooth unwinding was very difficult.
D: The runout was 20 mm or more, very strong blocking occurred, and the glass sheet was damaged.

The glass surface observation (visual observation) results A to B shown in Table 1 are as follows.
A: Contamination was not recognized and it was clean.
B: Contamination was observed.

The surface roughness (Ra) is an average value of 20 measured values, and was measured using a surface roughness meter (manufactured by Tokyo Seimitsu Co., Ltd., SURFCOM 1400D). The measurement conditions at each point are as follows.

Cut-off value λc: 0.8 mm
Cut-off ratio λc / λs: 1000
Cut-off filter: Gaussian filter Tilt correction: Both end correction Measurement length: 10mm
Measurement speed: 0.15 mm / sec As explained above, the glass roll 100 according to the present embodiment has the resin coating-coated glass sheet 13 that does not block even when the resin coating surface and the glass surface are in close contact. It is formed by being wound around the core 20. Therefore, the glass roll 100 can be easily fed out without damaging the glass sheet 13 with a resin coating film, even if an interleaf or a protective film is not provided between the glass sheet 13 with a resin coating film to be wound. It is possible.

As mentioned above, although the glass roll which concerns on embodiment was demonstrated, this invention is not limited to the said embodiment, A various deformation | transformation and improvement are possible within the scope of the present invention.

This international application claims priority based on Japanese Patent Application No. 2014-021682 filed on February 6, 2014, and the entire contents of Japanese Patent Application No. 2014-021682 are incorporated herein by reference. Incorporate.

11 Glass sheet 12 Resin coating film 13 Glass sheet with resin coating film 20 Core 100 Glass roll

Claims

A glass roll in which a glass sheet with a resin coating film formed on one side of a glass sheet is wound,
The glass sheet has a thickness of 10 to 300 μm,
The said glass sheet with a resin coating film is a glass roll by which it is laminated | stacked and wound so that the resin coating film surface and the glass surface of another layer may contact.
7 days after the glass sheet with the resin coating film is wound, the swing width of the glass sheet with the resin coating film is 20 mm or less when unrolling to the support means provided so that the transition length is 500 mm. The glass roll according to claim 1, wherein
The glass roll according to claim 1 or 2, wherein the resin coating film has a thickness of 0.1 to 1000 µm.
The glass roll according to any one of claims 1 to 3, wherein the resin coating film includes a fluororesin.
The glass roll according to any one of claims 1 to 4, wherein the glass sheet with a resin coating film has a roughness of the resin coating film surface of 0.1 to 35 nm.