Film roll package, method of manufacturing the same, and method of storing the roll

Abstract

Provided is a film roll package in which a change in the winding form of a film in a roll does not easily occur even when stored for a long period of time. A roll (10) includes a roll core (1) and a film winding body (3) in which a long film is wound in a roll shape on the outer periphery of the roll core. The long film has knurl structures at both ends in the width direction. A film roll package (101) has a packaging material that covers the entire film winding body, and the film winding body is disposed in a pressurized and sealed space formed by the packaging material.

Description

Technical Field

[0001] This invention relates to a film roll package, which is made by packaging a roll of long strip film into a package using packaging materials, and a method for manufacturing the same. Furthermore, this invention relates to a method for storing the roll. Background Technology

[0002] In liquid crystal display devices or organic EL display devices, optical films such as polarizers and retardation plates are used. These optical films are provided as single layers or as laminates of multiple films. For example, a polarizer is typically a laminate in which a transparent protective film is laminated on one or both sides of a polarizer via a suitable adhesive layer.

[0003] These films are manufactured as rolls, in which long strips of film are wound in a roll around the outer periphery of a core (also called a "core"). They are stored and transported in roll form to the next process. For example, in the manufacturing process of polarizers, after the transparent protective film, which serves as the protective layer of the polarizer, is first rolled into a roll as a single layer, the transparent protective film is unwound from the roll in the next process and bonded to the polarizer.

[0004] To prevent contamination and deformation of the film between the manufacture of the roll and its use in the next process, the roll is packaged with appropriate packaging material (bundling material) (for example, see Patent Document 1 and Patent Document 2).

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2020-97447

[0008] Patent Document 2: International Publication No. 2012 / 060142 Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] If long strips of film are stored in rolls for extended periods, their winding shape may change due to tight winding or adhesion between the films. In particular, when wide films are rolled into rolls, changes in winding shape are easily caused by deflection due to the film's own weight, even when the rolls are stored in environments with minimal external environmental changes, such as cleanrooms. If the winding shape of the roll changes, the quality of the film is compromised; for example, when used as optical films, it can lead to poor image quality, such as unevenness or defects in the displayed image.

[0011] In view of such problems, the object of the present invention is to provide a film roll packaging body and a packaging method thereof that do not easily cause changes in the winding shape of the film even under long-term storage.

[0012] Methods used to solve problems

[0013] One embodiment of the present invention is a film roll package in which a film roll body comprising a core and a strip of film wound in a roll shape around the outer periphery of the core is covered by packaging material. The strip of film may also have knurled structures at both ends in the width direction. The strip of film may also be an optical film.

[0014] In a film roll package, a film roll is disposed within a pressurized, sealed space formed by packaging material. Alternatively, the entire roll, including the core in addition to the film roll, may be sealed within a pressurized, sealed space formed by packaging material.

[0015] With the roll covered by a packaging material having at least one opening, the opening is sealed by encapsulating gas into the space formed by the packaging material, thus creating a sealed package in which the film roll is encapsulated within a pressurized, sealed space formed by the packaging material. The packaging material with the opening can be, for example, a bag-shaped film with an opening on one side or a cylindrical film with openings at both ends.

[0016] The core of the roll can also protrude from both ends in the width direction of the film roll. The roll can also be stored with the load applied to the protruding portions of the core. Packaging material can also be wound around the protruding portions of the core to secure the packaging material.

[0017] Invention Effects

[0018] By placing the film roll within a pressurized, sealed space made of packaging material, changes in the roll's winding shape can be suppressed, thus enabling long-term storage in its rolled state. Attached Figure Description

[0019] Figure 1 This is a perspective view showing the appearance of a scroll according to one embodiment.

[0020] Figure 2 This is a cross-sectional view of the volume of one embodiment.

[0021] Figure 3 This is a schematic diagram showing the stacked state of a film winding with a knurled structure.

[0022] Figure 4 This is a cross-sectional view of a film roll package according to one embodiment.

[0023] Figure 5 This is a schematic diagram of bag-shaped packaging material.

[0024] Figure 6 This is a cross-sectional view of a film roll package according to one embodiment.

[0025] Figure 7 This is a cross-sectional view of a film roll package according to one embodiment.

[0026] Figure 8 This is a schematic diagram of a cylindrical packaging material.

[0027] Figure 9 This is a cross-sectional view of a film roll package according to one embodiment. Detailed Implementation

[0028] [volume]

[0029] Figure 1 This is a perspective view showing the appearance of the scroll body according to one embodiment. Figure 2 This is its cross-sectional view. The roll body 10 has a film winding body 3 on the outer periphery of the cylindrical core 1, which winds the long strip of film into a roll.

[0030] In the roll 10, the strip film wound on the core 1 can be either transparent or opaque. The strip film can also be an optical film used in image display devices such as liquid crystal display devices or organic EL display devices. Examples of optical films include polarizers, polarizers, polarizer protective films, phase retardation plates, anti-reflective films, transparent conductive films, and hard-coated films.

[0031] Examples of membrane materials include cellulose resins, polyester resins, polyethersulfone resins, polysulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth)acrylic resins, cyclic polyolefin resins (norbornene resins), polyarylate resins, polystyrene resins, and polyvinyl alcohol resins.

[0032] The thickness of the membrane is, for example, approximately 3–500 μm, but can also be 5–300 μm, 10–200 μm, 15–150 μm, or 20–100 μm. The width of the strip membrane (…) Figure 1 The length in the x-direction is approximately 200–7000 mm, but can also be 500–5000 mm or 1000–4000 mm. The length of the strip membrane is approximately 50–10000 m, but can also be 100–7000 m, 300–5000 m, or 500–4000 m.

[0033] Long strip films are formed, for example, by solution casting or melt casting. In solution casting, a resin solution is cast onto the surface of a support, and the film is formed by peeling it off from the support after some solvent removal from the cast film. Alternatively, the film peeled off from the support can be heated to remove residual solvent. In melt casting, molten resin is cast onto a support, cooled and solidified on the support, and then peeled off from the support to form a film. In both solution casting and melt casting, the film peeled off from the support can be stretched, coated, or cut into strips. When a flexible film is used as the support in solution casting, stretching, coating, or cutting can be performed before peeling the film off from the support.

[0034] A film roll 3 is formed by winding the long strip of film along the circumference of the core 1 in the longer direction. To prevent the wound film from being misaligned or sticking together, it is preferable to emboss both ends of the long strip of film in the width direction before winding it onto the core 1, forming a knurled structure 35. The knurled structure is a series of tiny bumps and recesses, also known as embossing or knurling.

[0035] Figure 3 This is a schematic cross-sectional view showing the stacked state of the films on a wound body with knurled structures formed at both ends. In the portions where the knurled structures 35 are formed at both ends of film 3A in the width direction, the protrusions of the knurled structures 35 are in contact with film 3B. Similarly, the protrusions of the knurled structures 35 of film 3B are in contact with film 3C. Therefore, in the film wound body 3, the two ends with the knurled structures 35 are tightly wound. On the other hand, an air layer 9 is formed between the films in the central portion in the width direction, preventing the films from contacting each other. Therefore, even when a long strip of film is wound into a roll, it is possible to prevent the films from sticking together.

[0036] The height of the knurling structure's protrusions and depressions is, for example, about 2 to 30 μm, or about 3% to 30% of the film thickness. The width of the knurling structure forming area at both ends of the film's width direction is, for example, about 5 to 20 mm. There are no particular limitations on the shape and size of each protrusion and depression in the knurling structure, the arrangement of the protrusions and depressions, or the spacing between them. It is preferred that the protrusions and depressions be formed in areas that account for about 5% to 60% of the area of ​​the knurling structure forming area.

[0037] From the perspective of ensuring strength, the outer diameter of the core 1 is preferably around 70-400 mm. When the core 1 is cylindrical, its thickness is preferably around 3-15 mm. The core 1 can also be cylindrical. A cylindrical core can also have internal cavities.

[0038] The length of the core (length in the winding axis direction) only needs to be greater than or equal to the width of the strip film (width of the film winding body 3). When the length of the core 1 is greater than the width of the strip film, the roll body 10 has protruding portions of the core 1 extending from both sides of the film winding body 3 in the winding axis direction (x-direction). The lengths of the protruding portions at both ends of the core 1 are preferably approximately 10–500 mm, but can also be 30–300 mm or 50–250 mm. The lengths of the protruding portions at both ends can be the same or different.

[0039] By placing the protruding portion on a suitable stand or similar surface, the roll 10 is supported from below by the core 1, so no pressure from gravity acts on the film winding body 3, allowing the roll to be stored statically. Alternatively, a suitable strap or similar material can be wound onto the protruding portion of the core 1 to store the roll 10 in a suspended state from above. In this way, by placing the load on the protruding portion of the core, the roll can be stored and transported without placing the load on the film winding body 3. Furthermore, the protruding portion of the core 1 can also be used to wrap and secure packaging materials, as described later.

[0040] The constituent material of core 1 can be any material that can ensure strength, without any particular limitation. Examples include synthetic resins such as polyethylene resin, polypropylene resin, polyvinyl chloride resin, polyester resin, epoxy resin, phenolic resin, melamine resin, silicone resin, polyurethane resin, polycarbonate resin, and ABS resin; metals such as aluminum; and fiber-reinforced plastics (FRP).

[0041] There are no particular limitations on the method of winding the long strip film into the core 1; any common winding method such as constant tension, constant torque, or oblique tension is acceptable. The diameter of the long strip film winding body 3 is determined based on the outer diameter of the core 1, as well as the thickness and length of the film, and is typically around 200–1200 mm, but can also be 300–1000 mm or 400–800 mm. Alternatively, to prevent the film from unwinding from the film winding body 3, the outer periphery of the long strip film can be temporarily fixed using an appropriate fixing mechanism such as adhesive tape 7.

[0042] [Packaging of the roll]

[0043] A film roll package is formed by covering and wrapping the roll 10 with packaging material. The film roll package of the present invention is characterized in that the film roll is contained within a sealed space formed by the packaging material, and the sealed space is under pressure.

[0044] Figure 4 This is a cross-sectional view of a film roll package 101 according to one embodiment of the present invention, in which the entire film roll 3 is housed in a pressurized, sealed space 59 formed by packaging material 41.

[0045] Figure 5This is a schematic diagram of the packaging material 41 before the roll is contained. The packaging material 41 is a rectangular bag-shaped structure with one side 414 open and the other three sides sealed, which allows the roll 10 to be inserted into the inside of the bag through the opening 414.

[0046] As packaging material 41, a bag-like structure is constructed by forming a flexible, film-like material. Examples of packaging materials include polyolefin resins such as polyethylene, polypropylene, and polymethylpentene; polyester resins such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate; fluorocarbon resins such as polytetrafluoroethylene; acrylic resins; nylon resins; vinyl chloride resins; vinylidene chloride resins; paper; and metals such as aluminum. From the viewpoint of durability and ease of handling during packaging, resin materials are preferred. The packaging material can also be a structure in which metal foil such as aluminum is vapor-deposited onto a resin film, or it can be a multilayer co-extruded film.

[0047] The packaging material 41 is preferably resistant to deformation when forming a pressurized, sealed space. From the viewpoint of balancing deformation prevention under pressure and operability, the thickness of the packaging material 41 is preferably 20–500 μm, more preferably 30–250 μm. The thickness of the packaging material 41 may also be 50 μm or more, or 100 μm or more.

[0048] Insert the roll 10 into the opening 414 of the bag-shaped packaging material 41, so that the packaging material 41 completely covers the film roll 3. If necessary, with the portion of the side 412 opposite to the opening 434 wrapped around the protruding part of the core 1, the fixing member 61 is wound around from the outer periphery to fix the packaging material 41 to the protruding part of the core 1. The fixing member 61 may be a rubber band, adhesive tape, or binding tape.

[0049] With the film roll 3 completely covered by the packaging material 41, gas is sealed into the bag-shaped packaging material 41 through the opening 414, thus pressurizing the inside of the bag. The sealed gas can be any gas that does not degrade the film; there are no particular limitations, but air is preferred due to its low cost.

[0050] After the gas is sealed, the sealing component 67 is rolled up to close the opening 414, preventing gas from leaking out of the opening 414 of the packaging material 41. The sealing component 67 can be a rubber band, adhesive tape, strapping tape, etc. Besides rolling up the sealing component, other methods for closing the opening include attaching adhesive tape or similar materials to the opening 414 of the packaging material 41, or fusion-bonding the opening 414 of the packaging material 41 after sealing the gas. Multiple methods can be used to more reliably prevent gas leakage from the opening.

[0051] By sealing the opening 414 under pressurized conditions while the gas is sealed, a pressurized sealed space 59 composed of packaging material 41 is formed, resulting in a film roll package 101 in which the film roll body 3 is disposed. The pressure of the pressurized sealed space 59 only needs to be higher than atmospheric pressure (0.1013 MPa), and can also be 0.105 MPa or more, 0.11 MPa or more, 0.12 MPa or more, 0.13 MPa or more, 0.14 MPa or more, or 0.15 MPa or more. From the viewpoint of preventing deformation and damage to the packaging material 41, the pressure of the pressurized sealed space 59 is preferably 1 MPa or less, and can also be 0.7 MPa or less, 0.5 MPa or less, 0.4 MPa or less, or 0.3 MPa or less.

[0052] By holding the roll body 3 of the long strip film with knurled structure 35 at both ends in the width direction in a pressurized and sealed space 59 formed by packaging material 41, the tendency for the film to stick together is suppressed even after a long period of time since the formation of the roll body, and the change of the winding shape of the roll body over time can be prevented.

[0053] like Figure 3 As shown, in the membrane winding with a knurled structure, the two ends where the knurled structure 35 is formed are tightly wound. In contrast, the central part in the membrane width direction is wound more loosely, so the winding shape of the winding is prone to change due to deflection caused by the membrane's own weight or environmental changes. When the membrane winding is placed in a pressurized sealed space 59, the space between the membranes (air layer) is also maintained under pressure. Since gas is difficult to leak out, it is conceivable that the space between the membranes is maintained, and adhesion between the membranes and changes in the winding shape are suppressed.

[0054] exist Figure 4 In the film roll packaging 101 shown, the closed edge 412 of the bag-shaped packaging material 41 is wrapped around the protruding part of the core 1 and secured with the fixing member 61. In this way, by wrapping the packaging material around the protruding part of the core 1 with the fixing member 61 and securing the packaging material, the packaging material will not bulge excessively when gas is sealed within it. Therefore, after packaging with the packaging material, the protruding part of the core 1 is easily reached during operations such as placing it on a stand to support the protruding part of the core 1 from below, or hanging it by winding a strap or the like around the protruding part of the core 1, resulting in excellent workability.

[0055] In order to block the opening 414 of the packaging material 41 and prevent gas leakage, the sealing member 67 needs to be tightly fastened. On the other hand, the fixing member 61 used to fix the closed edge 412 of the packaging material 41 only needs to maintain the pressurized state of the sealed space formed by the packaging material 41, and does not need to be tightly fastened. It is sufficient to fix the sealing member to the protruding part of the core 1.

[0056] The film roll packaging body simply needs to be sealed within a pressurized, airtight space formed by the packaging material, and is not limited to... Figure 4 The shape shown. For example, since the edge 412 of the packaging material 41 is closed, a pressurized and sealed space formed by the packaging material can be formed even if this part is not fixed by the fixing member 61. Therefore, the film roll package may not have the fixing member 61.

[0057] exist Figure 6 In the film roll packaging 102 shown, annular components 65 and 66 are wound around the outer periphery of the packaging material 41 at the center in the width direction. The annular components 65 and 66 may be rubber bands, adhesive tapes, or binding tapes. There may be one or more annular components at the center in the width direction.

[0058] By winding the annular components 65 and 66 around the center of the film roll package in the width direction, the packaging material will not bulge excessively when the gas is sealed within it. Therefore, the increase in the volume of the film roll package is suppressed, improving its handleability.

[0059] The annular components 65 and 66 can also be wrapped around the outer periphery of the packaging material 41 before the gas is sealed into it. Alternatively, the gas can be sealed into the packaging material 41, and the annular components 65 and 66 can be wrapped around it after the sealing component 67 has sealed it to prevent gas leakage from the opening 414. When using an annular component with an adjustable circumference, such as a strapping band, the annular component can be wrapped around it beforehand, and the circumference of the annular component can be reduced after the gas is sealed, thus securing the gas-sealed packaging material.

[0060] Even if the sealed space formed by the packaging material 41 is not pressurized during gas encapsulation, the sealed space can be pressurized by rolling up the annular components 65 and 66 after encapsulating the gas in the packaging material 41, thereby reducing the volume of the sealed space. The same applies when the circumference of the annular components 65 and 66 is reduced and tightened after encapsulating the gas in the packaging material 41.

[0061] The sealing used to plug the opening of the packaging material does not necessarily require the protrusion of core 1. For example, it can also be done as follows: Figure 7 As shown in the film roll packaging 103, the entire roll 10, including the core 1, is disposed in a pressurized and sealed space 59 formed by the packaging material 41.

[0062] exist Figure 7In the package 103 shown, the opening 414 of the packaging material is closed by binding the end of the bag-shaped packaging material 41 to the outside of the core 1 with a closing member 68. The closing member 68 can be a rubber band, adhesive tape, or binding tape. As described above, the method of closing the opening is not limited to rolling up the closing member; adhesive tape or similar materials can be pasted onto the opening, or the opening of the packaging material can be melt-bonded.

[0063] The packaging material covering the roll only needs to create a pressurized, sealed space; it doesn't need to be bag-shaped. For example, it can also be like... Figure 8 As shown, the roll is packaged using a cylindrical packaging material 43 with openings 432 and 434 at both ends. The cylindrical packaging material is a structure formed by shaping a flexible film-like material into a cylindrical shape. Alternatively, one opening of the cylindrical packaging material can be closed by means of welding or other methods to form a bag-shaped packaging material.

[0064] Figure 9 This is a cross-sectional view of a film roll package 105 formed by wrapping the roll 10 with a cylindrical packaging material 43. The roll 10 is inserted into the inside of the cylinder through the opening of the packaging material 43, so that the packaging material 43 completely covers the film roll 3. Then, with one opening 432 partially wrapped around the protruding portion of the core 1, the closure member 62 is wound around from the outside, fixing the packaging material 43 to the protruding portion of the core 1. At this time, the fixing is performed without gaps to prevent gas encapsulated in the packaging material from leaking out of the opening of the packaging material.

[0065] Then, gas is sealed into the packaging material 43 through the opening 434 on the other side of the packaging material, pressurizing the space formed by the packaging material 43. After sealing the gas, the sealing component 67 is rolled up to prevent gas leakage from the opening 434 of the packaging material 43, resulting in a film roll package 105 in which the film roll 3 is sealed inside the pressurized sealed space 59 formed by the packaging material 43. When using a cylindrical packaging material 43, it is also similar to... Figure 6 Similarly, in the embodiment shown, the fixing component can also be wound around the center of the film roll package in the width direction.

[0066] exist Figure 8 In the illustrated embodiment, with the two openings 432 and 434 of the cylindrical packaging material 43 rolled around the outer periphery of the protruding portions at both ends of the core 1, the openings 432 and 434 are closed by rolling the closing members 62 and 67 around the outer periphery. Alternatively, the openings 432 and 434 can be closed by binding the ends of the packaging material 43 to the outer side of the core 1 with the closing members, or by methods such as fusion bonding or tape adhesion.

[0067] [Storage and transport of the rolls]

[0068] As described above, the roll 10 is stored in a film roll package containing the film roll within a pressurized, sealed space formed by packaging material. Alternatively, the roll 10 can be transported in the form of a film roll package.

[0069] The film roll package can also be stored with the protrusion of the core 1 placed on a shelf. By placing the load on the protrusion of the core, the roll can be stored and transported without placing the load on the film roll body 3. If the core 1 is cylindrical, the load can also be placed on the shelf by inserting a suitable shaft through the hollow portion of the core 1 and placing the shaft on the shelf.

[0070] In film roll packaging, because the film roll is sealed within a pressurized, airtight space, gas between the film layers is unlikely to leak out, even when stored in roll form for extended periods. Therefore, adhesion between the films or changes in the roll's winding shape are less likely to occur, resulting in excellent storage stability. Furthermore, transporting the roll in a packaged state with the film roll sealed within a pressurized, airtight space further suppresses adhesion between the films and changes in the roll's winding shape.

[0071] Example

[0072] The present invention is illustrated in more detail below with reference to the embodiments shown, but the present invention is not limited to the examples described below.

[0073] An acrylic transparent film with a thickness of 40 μm, a width of 1200 mm, and a length of 1000 m is wound onto an FRP core with an inner diameter of 6 inches (153 mm), a thickness of 8 mm, and a width of 1400 mm to form a roll. At both ends of the acrylic transparent film in the width direction, a knurled structure with a height of 9 μm is formed in a 10 mm wide area.

[0074] Prepare a polyethylene bag with a thickness of 100 μm that can hold the aforementioned roll. Insert the roll into the bag, pressurize it by sealing it with compressed air through the bag opening, and then wrap an adhesive tape around the opening to seal it and prevent air leakage, thus creating the film roll package of the embodiment. As comparative samples, prepare a package in which compressed air is not filled inside the bag and the opening is sealed with tape to form a closed space at atmospheric pressure (Comparative Example 1), and an unpackaged roll (Comparative Example 2).

[0075] The packaging body of the embodiment, the packaging body of Comparative Example 1, and the roll body of Comparative Example 2 were placed on a metal rack to support the protruding part of the end of the roll core from below. They were placed in a clean room with a temperature of 25°C and a relative humidity of 60%, and the winding shape was visually checked every day.

[0076] The packaging of Comparative Example 1 and the roll of Comparative Example 2 showed changes in their winding shape after 5 days, confirming the film adhesion. The packaging of the embodiment, whose roll was sealed in a pressurized, airtight space, also showed no change in its winding shape after 30 days, exhibiting excellent storage stability.

[0077] Label Explanation

[0078] 1 core

[0079] 3. Membrane winding

[0080] 10 volumes

[0081] 41, 43 Packaging materials

[0082] 61 Fixed components

[0083] 65, 66 ring-shaped components

[0084] 62, 67, 68 Enclosed components

[0085] 101, 102, 103, 105 film roll packaging

Claims

1. A film roll packaging body, comprising: a roll body having a core and a film roll having a strip of film wound in a roll shape around the outer periphery of the core; and a packaging material that completely covers the film roll; characterized in that, The aforementioned elongated film has a knurled structure at both ends in the width direction. The aforementioned film roll is disposed within a pressurized, sealed space formed by the aforementioned packaging material. By winding the annular component around the outer periphery of the packaging material at the center of the width direction of the aforementioned film roll, the space formed by the aforementioned packaging material becomes pressurized.

2. The film roll packaging body as described in claim 1, wherein, The aforementioned core protrudes from both ends of the aforementioned film winding in the width direction. The packaging material is wound and secured onto the protruding portion of the aforementioned core.

3. The film roll packaging body as described in claim 1, wherein, The entire core is housed within the pressurized, sealed space.

4. The film roll packaging body according to any one of claims 1 to 3, wherein, The aforementioned long strip film is an optical film.

5. A method for manufacturing a film roll package, wherein the film roll package contains a roll of a film roll having a core and a strip of film wound in a roll shape around the outer periphery of the core, characterized in that, The aforementioned elongated film has a knurled structure at both ends in the width direction. With the roll covered by a packaging material having at least one opening, gas is sealed into the space formed by the packaging material through the opening. By closing the opening, a sealed state is achieved, resulting in the film roll being encapsulated within a pressurized, sealed space formed by the packaging material. By winding the annular component around the outer periphery of the packaging material at the center of the width direction of the aforementioned film roll, the space formed by the aforementioned packaging material becomes pressurized.

6. A method for storing a roll, the roll comprising a core and a film winding having a strip of film wound in a roll shape around the outer periphery of the core, characterized in that, The aforementioned elongated film has a knurled structure at both ends in the width direction. With the roll covered by a packaging material having at least one opening, gas is sealed into the space formed by the packaging material through the opening. By closing the opening to create a sealed state, the aforementioned film roll is packaged within a pressurized, sealed space formed by the aforementioned packaging material. The film roll is stored in a pressurized, sealed space. By winding the annular component around the outer periphery of the packaging material at the center of the width direction of the aforementioned film roll, the space formed by the aforementioned packaging material becomes pressurized.

7. The method for storing the volume as described in claim 6, wherein, The aforementioned core protrudes from both ends of the aforementioned film winding in the width direction. The roll is stored with the load applied to the protruding portion of the core.

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