KR102457311B1 - Film roll - Google Patents

Abstract

A film roll in which a film (not shown) is wound around a cylindrical core (1), the film roll having an absorbent member (3) on the inner wall (2) of the core (1). It is preferable to have the absorbent member 3 on the inner wall 2 of both ends 5 of the core 1, and it is preferable to have the absorbent member 3 under the inner wall 2 of the core 1, It is preferable that the distance from the end 4 of the core 1 to the absorbent member 3 is 10 cm or more, and the absorbent member 3 is at least one selected from the group consisting of cellulosic synthetic fibers and polyester fibers. It is preferred to contain the species.

Description

Film roll {FILM ROLL}

The present invention relates to a film roll in which a film is wound around a cylindrical core.

A plastic film such as a polyvinyl alcohol (hereinafter, "polyvinyl alcohol" may be abbreviated as "PVA") film used as a raw material for a polarizing film is usually in the form of a film roll formed by winding on a cylindrical core. stored or transported. In recent years, the PVA film used as the raw material of the polarizing film for liquid crystal displays WHEREIN: While a wider PVA film is requested|required with enlargement of a liquid crystal display, in order to improve the workability and productivity with respect to a polarizing film, winding length is long. A PVA film is also calculated|required. Due to the increase in the weight of the film roll along with such widening and lengthening of the PVA film, the support bar is placed inside the core during loading or moving of the film roll to a mount or a processing device. The method of putting it in and handling it became versatile. Therefore, in order to facilitate the insertion of the support rod into the core, both ends of the cylindrical core are opened without blocking with a cap or the like, and there are many opportunities for the film roll to be transported or stored while the inside of the core is exposed to the outside air. . Moreover, a metal, carbon fiber reinforced plastics, or these composite materials with high intensity|strength (bending rigidity etc.) came to be used also about the material of a cylindrical core.

By the way, when a film roll is carried in from a storage place not conditioned to a processing place conditioned in winter in a cold region or the like, dew condensation may form on the inner wall of the cylindrical core. In particular, in recent years, since the weight of the film roll has started to increase as described above, condensation is more likely to occur due to an increase in the heat capacity of the film roll and a decrease in the rate of temperature change of the entire film roll accompanying it. In addition, as described above, with the increase in the weight of the film roll, metal cores and carbon fiber reinforced plastic cores have come to be used. prone to occur

In order to solve the problem of the above dew condensation, the method of making the packaging form of a film roll into a specific thing is known, for example (refer patent document 1).

International Publication No. 2012/147665

However, in the method of Patent Document 1, since it is necessary to employ a special packaging form, there is room for further improvement in providing a method capable of solving the problem of dew condensation without employing such a packaging form.

Then, an object of this invention is to provide the film roll which is not easily affected by dew condensation, even when dew condensation generate|occur|produces on the inner wall of a cylindrical core.

As a result of overlapping intensive studies to achieve the above object, the present inventors have attached an absorbent member to the inner wall of the cylindrical core, so that even when dew condensation occurs on the inner wall of the core, the film roll is not easily affected by dew condensation. This was found out, and based on the said knowledge, further examination was repeated, and this invention was completed.

That is, the present invention is

[1] A film roll in which a film is wound around a cylindrical core, the film roll having an absorbent member on an inner wall of the core;

[2] The film roll according to [1], having an absorbent member on inner walls of both ends of the core;

[3] The film roll according to [1] or [2], which has an absorbent member under the inner wall of the core;

[4] The film roll according to any one of [1] to [3], wherein the distance from the end of the core to the absorbent member is 10 cm or more;

[5] The film roll according to any one of [1] to [4], wherein the absorbent member contains at least one selected from the group consisting of cellulose synthetic fibers and polyester fibers;

[6] The film roll according to any one of [1] to [5], wherein a plurality of absorbent members are laminated;

[7] The film roll according to any one of [1] to [6], wherein the absorbent member is fixed to the inner wall of the core with an adhesive tape;

[8] The film roll according to [7], wherein the adhesive tape is made of polyethylene or polypropylene;

[9] The film roll according to any one of [1] to [8], wherein the core is made of metal or plastic;

[10] The film roll according to any one of [1] to [9], wherein the length of the core in the axial direction is 2.5 m or more;

[11] The film roll according to any one of [1] to [10], wherein the film is a PVA film;

[12] The film roll according to any one of [1] to [11], wherein the mass is 500 kg or more;

[13] The film roll according to any one of [1] to [12], wherein the film has a length of 2,000 m or more.

ADVANTAGE OF THE INVENTION According to this invention, even when dew condensation generate|occur|produces on the inner wall of a cylindrical core, the film roll which is not easily affected by dew condensation is provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which shows the mode of the one edge part of the core in the film roll of Example 1 (however, the film is not shown), (a) is the schematic view seen from the axial direction of the core, (b) is the core It is a schematic view viewed from the direction on the horizontal plane perpendicular to the axial direction of .

Hereinafter, the present invention will be described in detail.

[core]

In the film roll of the present invention, a film is wound around a cylindrical core. There is no restriction|limiting in particular in the kind of the said cylindrical core, For example, a metal thing, a plastic thing, a paper thing, a wooden thing, etc. are mentioned. In addition, a core in the form of a composite can be used, such as one in which both metal and plastic are used, one in which both metal and paper are used, and one in which both plastic and paper are used. Among these, metal and/or plastic cores are preferable because they have high strength and the effect of the present invention is exhibited more remarkably, and metal cores are not easily affected by wear or the like even after repeated use. more preferably. The ratio of the mass of metal and plastic to the total mass of the cylindrical core is preferably 50 mass% or more, more preferably 80 mass% or more, still more preferably 95 mass% or more, and particularly preferably 100 mass%. desirable.

As said metal, iron, stainless steel, aluminum etc. are mentioned, for example, Among these, 1 type may be used individually, and 2 or more types may be used together. Among these, from the viewpoints of strength, lightness, price, and the like, aluminum is preferable.

Moreover, as said plastics, polyvinyl chloride, polyvinylidene chloride, polyester, polycarbonate, polyamide, an epoxy resin, a polyurethane, polyurea, a silicone resin, etc. are mentioned, for example, Among these, 1 Species may be used independently and may use 2 or more types together. Among these, polyvinyl chloride is preferable. It is also preferable that the said plastics are fiber reinforced plastics (FRP), such as a carbon fiber reinforced plastics, from viewpoints, such as intensity|strength.

In the present invention, even when the material of at least a part of the surface of the cylindrical core is a core that tends to generate dew such as metal and/or plastic, it is not easily affected by dew condensation. Therefore, when such a core is used, the effect of this invention is exhibited more notably. Since the effect of the present invention is more significantly exhibited, the cylindrical core is made of at least a part of its inner circumferential surface (preferably 50% or more of the area of the inner circumferential surface, more preferably 80% or more of the area of the inner circumferential surface) This metal and/or plastic is preferable, it is more preferable that the material of the entire inner peripheral surface is metal and/or plastic, and it is still more preferable that the material of the entire surface of the cylindrical core is metal and/or plastic.

The length in the axial direction of the cylindrical core can be appropriately selected depending on the width of the film wound on it, but the length is preferably 2.5 m or more, and 3 m or more, from the viewpoint of exhibiting the effect of the present invention more conspicuously. It is more preferable, and it is still more preferable that it is 3.5 m or more. Although there is no restriction|limiting in particular in the upper limit of the said length, The said length is 8.5 m or less, for example.

Although the diameter of a cylindrical core is not specifically limited, It is preferable that the outer diameter exists in the range of 50-800 mm from a viewpoint of intensity|strength, handleability, etc., It is more preferable to exist in the range of 80-500 mm, It is 100-300 mm It is more preferable to exist in the range of, and it is especially preferable to exist in the range of 150-250 mm.

Further, the thickness of the cylindrical core is preferably in the range of 2 to 50 mm, more preferably in the range of 3 to 20 mm, and furthermore in the range of 4 to 10 mm from the viewpoints of strength and handleability. desirable.

[film]

There is no particular limitation on the type of the above film, for example, a polyethylene film, a polypropylene film, a polymethylpentene film, an alicyclic olefin-based polymer film, a polystyrene film, a polycarbonate film, a polyvinyl chloride film, a methacrylic resin film , a polyamide film, a polyethylene terephthalate film, a PVA film, etc. are mentioned, In particular, a PVA film is preferable at the point which the quality fall by moisture absorption is large and the effect of this invention is exhibited more notably.

As PVA which comprises a PVA film, what was manufactured by saponifying the polyvinyl ester obtained by superposing|polymerizing a vinyl ester-type monomer can be used. Examples of the vinyl ester-based monomer include vinyl formate, vinyl acetate, vinyl propionate, vinyl valerate, vinyl laurate, vinyl stearate, vinyl benzoate, vinyl pivalate, and vinyl versatate. Among these, vinyl acetate is preferable.

Although the polymerization degree of PVA constituting the PVA film varies depending on the use of the PVA film, it is preferably in the range of 500 to 9,000, more preferably in the range of 1,500 to 7,000, and still more preferably in the range of 1,800 to 5,000. And it is especially preferable to exist in the range of 2,000-3,000. In addition, the polymerization degree of PVA used in this specification means the average degree of polymerization measured according to description of JISK6726-1994.

Moreover, although the degree of saponification of PVA constituting the PVA film varies depending on the use of the PVA film, etc., it is preferably 75 mol% or more, more preferably 85 mol% or more, still more preferably 95 mol% or more, 99 It is especially preferable that it is mol% or more. Incidentally, the degree of saponification of PVA in the present specification refers to the number of moles of the structural units (typically vinyl ester units) and vinyl alcohol units that can be converted into vinyl alcohol units by saponification of PVA. It refers to the ratio (mol%) which the number of moles occupies. The degree of saponification can be measured according to the description of JIS K 6726-1994.

You may make a PVA film contain a plasticizer, surfactant, a dichroic dye, etc. as needed. There is no restriction|limiting in particular in the manufacturing method of a PVA film, The PVA film formed into a film by well-known methods, such as a solution film forming method and a melt film forming method, can be used preferably.

Although the thickness of a film is not specifically limited, It is preferable to exist in the range of 5-500 micrometers, It is more preferable to exist in the range which is 10-300 micrometers, It is more preferable to exist in the range which is 15-100 micrometers.

Although the width of the film is not particularly limited, it is preferably 2.1 m or more, more preferably 2.3 m or more, still more preferably 2.6 m or more, particularly preferably 3 m or more, and most preferably 3.3 m or more. In the case of using a film having such a width, water derived from dew condensation is more likely to occur in a large amount, but in the present invention, since it is not easily affected by dew condensation, in the case of using a film having the above width Therefore, the effect of this invention is exhibited more notably.

On the other hand, since handleability may fall when the width|variety of a film is too wide, it is preferable that the width|variety of a film is 8 m or less.

Although the length of the film wound around a cylindrical core is not specifically limited, It is preferable that it is 2,000 m or more, It is more preferable that it is 4,000 m or more, It is more preferable that it is 7,000 m or more, It is especially preferable that it is 11,000 m or more. In the case of less than 2,000 m, it may not be economical for reasons such as an increase in the ratio to the whole of the loss generated at the winding start/winding end portion of the film roll. On the other hand, the upper limit of the length of the film is not particularly limited, but if it is too long, the mass or diameter of the film roll becomes excessive, and handling of the film tends to become difficult during loading or moving to a mount or a processing device. The length is preferably 20,000 m or less.

The mass of the film roll of the present invention is preferably 500 kg or more, more preferably 1,000 kg or more, still more preferably 1,800 kg or more, and particularly preferably 3,300 kg or more. In this invention, even if it is a film roll with a larger mass and is easy to generate|occur|produce dew condensation, it is not easily affected by dew condensation. Therefore, in the case of the above film rolls, the effect of this invention is exhibited more notably. However, it is preferable that the mass of a film roll is 5,000 kg or less at the point which handleability etc. may fall when the mass of a film roll is too big|large too much.

[absorbent member]

The film roll of the present invention has an absorbent member on the inner wall of the core. Although there is no restriction|limiting in particular at the position where the absorbent member is arrange|positioned in the inner wall of a core, It is preferable to arrange|position on the inner wall of the edge part of a core from the point which the effect of this invention is exhibited more notably. As for the specific arrangement position of the absorbent member, from the viewpoint of not obstructing the movement of the film roll, the distance (shortest distance) from the end of the core to the absorbent member is preferably 10 cm or more, and more preferably 15 cm or more. desirable. On the other hand, it is preferable that the above-described distance is 50 cm or less from the viewpoint that it tends to be difficult to attach the absorbent member when it is too far from the stage. When the absorbent member is disposed on the inner wall of the end portion of the core, the absorbent member may be disposed only on the inner wall of one end portion in the axial direction of the core. It is preferable to have

The absorbent member may be arranged in an annular shape so as to continuously follow the circumferential surface of the inner wall of the core, but from the viewpoint of ease of arrangement and cost reduction, it is preferable to arrange only a part of the circumferential surface of the inner wall of the core. More preferably, the absorbent member is disposed below the inner wall of the core.

The material of the absorbent member is not particularly limited, and any member may be used as long as it has absorptive properties. Specific examples of the material of the absorbent member include a cellulose-based synthetic fiber, a cellulose-based natural fiber, and a polyester-based fiber. Among these, it is preferable that at least one member selected from the group consisting of cellulose-based synthetic fibers and polyester-based fibers is preferable in that fragments of the absorbent member are attached to the film, and problems such as deterioration of the film do not occur easily. , it is more preferable that it is a cellulose-type synthetic fiber. The absorbent member is preferably made of the above fibers from the viewpoint of low cost and target stability of the absorbent performance over time. do.

Although there is no restriction|limiting in particular in the form of an absorbent member, From a viewpoint of easiness of handling, availability, etc., it is preferable that it is sheet-like, and it is more preferable that it is especially preferable that it is a sheet-like nonwoven fabric. When a sheet-like absorbent member is used, one sheet may be disposed on the inner wall of the core alone, but it is preferable to laminate a plurality of absorbent members from the viewpoint of securing sufficient absorbent capacity. In this case, the number of the absorbent members to be laminated is not particularly limited, but for example, preferably 2 or more, more preferably 3 or more, still more preferably 4 or more, and preferably 10 or less.

There is no particular limitation on the arrangement means for disposing the absorbent member on the inner wall of the core, and examples thereof include an adhesive tape, an adhesive, and a magnet. The member is preferably fixed by an adhesive tape.

There is no particular limitation on the type of the adhesive tape described above, and examples thereof include a paper adhesive tape, a cloth adhesive tape, a film adhesive tape, a special adhesive tape, and the like, and specifically, a cellophane tape, a kraft adhesive tape, a cloth adhesive tape, OPP adhesive tape, aluminum tape, vinyl tape, polyester tape, polyethylene tape, polypropylene tape, polyimide tape, gum tape, or a composite tape processed by combining two or more types thereof can be exemplified. Among these, the adhesive tape made from polyethylene or polypropylene is preferable at the point which problems, such as fragments of an adhesive tape adhering to a film, and the quality of a film fall less easily, and is excellent also in waterproofness.

The film roll of this invention may be transported or stored in the form as it is, and may be transported or stored in the form of the package packaged with the packaging material. Although there is no restriction|limiting in particular in the use of the film in the film roll of this invention, According to this invention, there is little influence of dew condensation, From the point which can maintain the outstanding film quality, the raw film for manufacturing optical films, such as a polarizing film It is preferable to use it as

Example

Hereinafter, the present invention will be specifically described with reference to Examples and the like, but the present invention is not limited by these Examples at all. In addition, each evaluation method of the dew condensation on the inner wall of the core, the outflow of the dew condensation from the core, dust observed on the inner wall of the core, and the fixing property of the absorbent member employed in the following Examples and Comparative Examples is shown below.

Condensation on the inner wall of the core

The appearance of the occurrence of dew condensation on the inner wall of the core was evaluated according to the following criteria.

○: There is relatively little dew condensation.

x: There are comparatively many dew condensations.

leakage of condensation from the core

The outflow of dew condensation from the core was evaluated on the basis of the following criteria.

(circle): The outflow of the dew condensation from the edge part of a core is not seen at all.

x: The outflow of the dew condensation from the edge part of a core is seen.

Dust identified on the inner wall of the core

The following criteria evaluated the dust confirmed on the inner wall of the core.

(circle): A particle|grain cannot be confirmed visually.

x: A particle|grain can be confirmed visually.

Stability of the absorbent member

The fixability of the absorbent member on the inner wall of the core was evaluated on the basis of the following criteria.

○: It is fixed and does not move.

×: It moves and is unstable.

[Example 1]

A film width of 3.3 m, a thickness of 60 μm, and a length of 12,500 m of a PVA film (PVA polymerization degree 2,450, PVA saponification degree 99.3 mol%) is made of aluminum and has a cylindrical shape having a length of 3.5 m, an outer diameter of 215 mm, and a thickness of 6 mm. It was wound on the central part of the core. Thereafter, two stacks of four sheets of nonwoven fabric (“Dust Tackle” wiper, manufactured by Kuraray Co., Ltd., length 33 cm × width 33 cm) made of cellulose synthetic fibers were prepared, and a schematic diagram was shown in FIG. Likewise, they were each fixed to the lower part of the inner wall of both ends of the core with an adhesive tape. In addition, the fixed position of the nonwoven fabric was set to a position 20 cm away from each end in the axial direction (the shortest distance from the end of the core to the absorbent member was 20 cm). Moreover, the thing made from polyethylene was used as an adhesive tape. The mass of the film roll thus obtained was 3,600 kg.

After the above-described film roll was stored at 10°C or lower for 10 hours or longer, it was left to stand for a predetermined time in an atmosphere in which condensation occurred at 20°C or higher, and each of the above evaluations was performed. The results are shown in Table 1.

[Example 2]

The same as in Example 1, except that, instead of stacking four sheets of nonwoven fabric made of a cellulosic synthetic fiber, two stacked sheets of natural cellulosic fibers (wool, 30 cm long × 30 cm wide) were used. to obtain a film roll. About this film roll, it carried out similarly to Example 1, and performed each evaluation. The results are shown in Table 1.

[Example 3]

Except having changed the length of the PVA film into 1,000 m from 12,500 m, it carried out similarly to Example 1, and obtained the film roll. In addition, the mass of the film roll was 300 kg. About this film roll, it carried out similarly to Example 1, and performed each evaluation. The results are shown in Table 1.

[Comparative Example 1]

Except not using the nonwoven fabric, it carried out similarly to Example 1, and obtained the film roll. About this film roll, it carried out similarly to Example 1, and performed each evaluation. The results are shown in Table 1.

1: Cylindrical core
2: the inner wall of the core
3: Absorbent member
4: one end of the core
5: one end of the core

Claims (13)

A film roll in which a polyvinyl alcohol film is wound around a cylindrical core, wherein the core is made of aluminum, the length of the core in the axial direction is 2.5 m or more, the mass of the film roll is 500 kg or more, and the inner wall of the core is A film roll having an absorbent member made of fibers at a lower portion, the distance from the end of the core to the absorbent member being 10 cm or more, and the both ends of the core being opened so that the inside of the core is exposed to the outside air. The method of claim 1,
A film roll having an absorbent member on inner walls of both ends of the core. delete delete 3. The method according to claim 1 or 2,
The film roll, wherein the absorbent member contains at least one selected from the group consisting of cellulose-based synthetic fibers and polyester-based fibers. 3. The method according to claim 1 or 2,
A film roll on which a plurality of absorbent members are laminated. 3. The method according to claim 1 or 2,
A film roll, wherein the absorbent member is secured to the inner wall of the core by an adhesive tape. 8. The method of claim 7,
The film roll whose adhesive tape is a product made from polyethylene or a product made from polypropylene. 3. The method according to claim 1 or 2,
A roll of film, the length of which is at least 2,000 m. delete delete delete delete

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