KR20160141710A - Film roll - Google Patents

Abstract

A film roll comprising a core (1) wound with a film (not shown), and a 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 the both ends 5 of the core 1 and to have the absorbent member 3 in the lower portion of 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 member selected from the group consisting of cellulose- It is preferable to contain 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 sometimes abbreviated as " PVA ") as a raw material of a polarizing film is usually formed into a film roll . Recently, in a PVA film to be a raw material of a polarizing film for a liquid crystal display, a wider PVA film is required along with the enlargement of a liquid crystal display, and in order to improve workability and productivity for a polarizing film, PVA films are also required. With the increase in the weight of the film roll as a result of widening and thickening of the PVA film as described above, a supporting rod is provided inside the core when the film roll is moved down or moved to a table or a processing apparatus There is a lot of ways to put in handling. Therefore, in order to facilitate the insertion of the support rod into the core, both ends of the cylindrical core are opened without being closed by a cap or the like, and the film roll is more likely to be transported or stored in a state in which the inside of the core is exposed to the outside air . Also, with respect to the material of the cylindrical core, a metal having high strength (bending stiffness or the like), a carbon fiber reinforced plastic, or a composite material thereof has been used.

Incidentally, when a film roll is carried from a storage place that is not air-conditioned to an air-conditioned processing place in a cold winter paper or the like in winter, condensation may occur on the inner wall of the cylindrical core. Especially in recent years, as described above, since the weight of the film roll has begun to increase, condensation is more likely to occur due to an increase in the heat capacity of the film roll and a decrease in the temperature change rate of the entire film roll. In addition, as described above, the metal core or the carbon fiber reinforced plastic core is used along with the increase in the weight of the film roll. However, the core made of metal or plastic has dew condensation as compared with the core made of paper It is easy to occur.

In order to solve the above-mentioned problem of condensation, for example, a method of making a packaging form of a film roll to be specific is known (see Patent Document 1).

International Publication No. 2012/147665

However, in the method of Patent Document 1, since it is necessary to adopt a special packing form, there is a room for new improvement in providing a method of solving the problem of condensation without adopting such a packing form.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a film roll which is not easily affected by condensation even when condensation occurs on the inner wall of a cylindrical core.

Means for Solving the Problems As a result of intensive investigations to achieve the above object, the present inventors have found that, by mounting an absorbent member on the inner wall of a cylindrical core, even when condensation occurs in the inner wall of the core, The present invention has been completed on the basis of the above-described findings.

That is,

[1] A film roll comprising a cylindrical core wound with a film, comprising: a film roll having an absorbent member on the inner wall of the core;

[2] The film roll according to [1], wherein the absorbent member is provided on the inner wall of both ends of the core,

[3] A film roll according to [1] or [2], wherein the film roll has an absorbent member at a lower portion of 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 absorbing 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 kind selected from the group consisting of cellulose-based synthetic fibers and polyester-

[6] A film roll according to any one of [1] to [5], wherein a plurality of absorbing members are laminated,

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

[8] The film roll described in [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] A film roll according to any one of [1] to [9], wherein the axial length of the core 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] A film roll according to any one of [1] to [12], wherein the film has a length of 2,000 m or more.

According to the present invention, even when condensation occurs in the inner wall of a cylindrical core, a film roll which is not easily affected by condensation is provided.

1 is a schematic view showing a state of one end of a core in a film roll of Embodiment 1 (note that the film is not shown), (a) is a schematic view seen from the axial direction of the core, (b) As viewed from the direction on the horizontal plane perpendicular to the axial direction of the motor.

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 particular limitation on the type of the core used in the present invention, and examples thereof include metal, plastic, paper, and wood. In addition, a core in the form of a composite such as a material in which both metal and plastic are used, a material in which both metal and paper are used, and both plastic and paper are used can be used. Of these, cores made of metals and / or plastics are preferable because they have high strength and furthermore, the effects of the present invention are more conspicuously exhibited. In view of not being affected by abrasion or the like repeatedly, More preferable. The proportion of the mass of the metal and the plastic to the total mass of the core is preferably 50 mass% or more, more preferably 80 mass% or more, even more preferably 95 mass% or more, and particularly preferably 100 mass% desirable.

Examples of the metal include iron, stainless steel, and aluminum. One of these metals may be used alone, or two or more metals may be used in combination. Among them, aluminum is preferable from the viewpoint of strength, light weight, cost, and the like.

Examples of the plastic include polyvinyl chloride, polyvinylidene chloride, polyester, polycarbonate, polyamide, epoxy resin, polyurethane, polyurea, and silicone resin. Among these, The species may be used singly or two or more species may be used in combination. Of these, polyvinyl chloride is preferable. It is also preferable that the plastic is a fiber reinforced plastic (FRP) such as carbon fiber reinforced plastic from the viewpoint of strength and the like.

In the present invention, even if a core which is susceptible to condensation such as metal and / or plastic is used as the material of at least a part of the surface of the cylindrical core, it is not easily affected by condensation. Therefore, the effect of the present invention is more remarkably exhibited when such a core is used. (Preferably at least 50% of the area of the inner circumferential surface, more preferably at least 80% of the area of the inner circumferential surface) of the inner circumferential surface of the core in that the effect of the present invention is more remarkably exhibited It is preferable that the metal and / or the plastic are all made of metal and / or plastic, and the material of the entire surface of the core is more preferably metal and / or plastic.

The length of the cylindrical core in the axial direction can be appropriately selected depending on the width of the film wound thereon and the like, but the length is preferably 2.5 m or more, more preferably 3 m or more More preferably 3.5 m or more. The upper limit of the length is not particularly limited, but the length is, for example, 8.5 m or less.

Although the diameter of the cylindrical core is not particularly limited, it is preferably within the range of 50 to 800 mm, more preferably within the range of 80 to 500 mm, more preferably within the range of 100 to 300 mm , More preferably within the range of 150 to 250 mm.

The thickness of the core of the cylindrical core is preferably in the range of 2 to 50 mm, more preferably in the range of 3 to 20 mm, more preferably in the range of 4 to 10 mm, desirable.

[film]

The kind of the above-mentioned film is not particularly limited, and examples thereof include a polyethylene film, a polypropylene film, a polymethylpentene film, an alicyclic olefin polymer film, a polystyrene film, a polycarbonate film, a polyvinyl chloride film, , A polyamide film, a polyethylene terephthalate film, and a PVA film. In particular, the PVA film is preferable in that quality deterioration due to moisture absorption is large and the effect of the present invention is more remarkably exhibited.

As the PVA constituting the PVA film, those produced by saponifying a polyvinyl ester obtained by polymerizing a vinyl ester 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 them, vinyl acetate is preferable.

The degree of polymerization of the PVA constituting the PVA film may vary depending on the use of the PVA film and the like, but is preferably in the range of 500 to 9,000, more preferably in the range of 1,500 to 7,000, and more preferably in the range of 1,800 to 5,000 And particularly preferably in the range of 2,000 to 3,000. In the present specification, the degree of polymerization of PVA means an average polymerization degree measured in accordance with the description of JIS K 6726-1994.

The degree of saponification of the PVA constituting the PVA film may vary depending on the use of the PVA film and is preferably 75 mol% or more, more preferably 85 mol% or more, still more preferably 95 mol% or more, and 99 Mol% or more. The saponification degree of PVA in the present specification means the degree of saponification of the PVA with respect to the total mole number of a structural unit (typically a vinyl ester unit) that can be converted into a vinyl alcohol unit by saponification of the PVA and a vinyl alcohol unit (Mol%) of the number of moles. The degree of saponification can be measured in accordance with the description of JIS K 6726-1994.

The PVA film may contain a plasticizer, a surfactant, a dichroic dye or the like, if necessary. The method for producing the PVA film is not particularly limited, and a PVA film formed by a known method such as a solution casting method or a melt film method can be preferably used.

The thickness of the film is not particularly limited, but is preferably in the range of 5 to 500 占 퐉, more preferably in the range of 10 to 300 占 퐉, and still more preferably in the range of 15 to 100 占 퐉.

The width of the film is not particularly limited, but is preferably not less than 2.1 m, more preferably not less than 2.3 m, further preferably not less than 2.6 m, particularly preferably not less than 3 m, most preferably not less than 3.3 m. When a film having such a width is used, water derived from condensation tends to be generated in a larger amount. However, in the present invention, since it is not easily affected by condensation, in the case of using a film having the above- Thus, the effect of the present invention is more remarkably exhibited.

On the other hand, when the width of the film is too wide, the handling property may be deteriorated. Therefore, the width of the film is preferably 8 m or less.

The length of the film wound around the cylindrical core is not particularly limited, but it is preferably at least 2,000 m, more preferably at least 4,000 m, even more preferably at least 7,000 m, and particularly preferably at least 11,000 m. If it is less than 2,000 m, there is a case in which it is not economical for reasons such as a large ratio of loss occurring in the winding start / winding end portion of the film roll. On the other hand, although the upper limit of the length of the film is not particularly limited, if it is too long, the mass or diameter of the film roll becomes excessive, 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, more preferably 1,800 kg or more, and particularly preferably 3,300 kg or more. In the present invention, even if the film roll is easy to cause condensation due to its mass, it is not easily affected by condensation. Therefore, the effect of the present invention is more remarkably exhibited in the case of the film roll as described above. However, if the mass of the film roll is too large, the handling property may be lowered. Therefore, the mass of the film roll is preferably 5,000 kg or less.

[Absorbing member]

The film roll of the present invention has an absorbent member on the inner wall of the core. The position where the absorbent member is disposed on the inner wall of the core is not particularly limited, but it is preferable that the absorbent member is disposed on the inner wall of the end portion of the core in that the effect of the present invention is more remarkably exhibited. A specific arrangement position of the absorbing member is preferably 10 cm or more (the shortest distance) from the end of the core to the absorbing member, and preferably 15 cm or more from the viewpoint of preventing the film roll from being disturbed when moving the film roll desirable. On the other hand, when it is too far from the end, the above-mentioned distance is preferably 50 cm or less in that the attachment of the absorbing member tends to become difficult. In the case where the absorbing member is disposed on the inner wall of the end portion of the core, the absorbing member may be disposed only on the inner wall of one end portion in the axial direction of the core. However, .

Although the absorbing member may be annularly arranged so as to continuously follow the circumferential surface of the inner wall of the core, it is preferable that the absorbing member is disposed only in a part of the circumferential surface of the inner wall of the core from the viewpoints of ease of arrangement and cost reduction. It is more preferable to arrange the absorbing member in the lower portion of the inner wall of the core.

The material of the absorbent member is not particularly limited, and any absorbent member may be used. Specific examples of the material of the absorbent member include cellulose-based synthetic fibers, cellulose-based natural fibers, and polyester-based fibers. Of these, at least one member selected from the group consisting of cellulose-based synthetic fibers and polyester-based fibers is preferable from the viewpoint that problems such as fragments of the absorbent member adhere to the film and the quality of the film deteriorates, , And cellulose-based synthetic fibers. It is preferable that the absorbent member is of the above-mentioned fiber in view of low cost and target stability over time of the absorbent performance. However, when a higher absorbing performance is required, it is also preferable to use a desiccant such as silica gel as the absorbent member Do.

The shape of the absorbent member is not particularly limited, but it is preferably sheet-like in view of ease of handling and availability, and more preferably sheet-like nonwoven fabric. In the case of using a sheet-like absorbent member, one sheet may be placed on the inner wall of the core alone, but it is preferable to laminate a plurality of absorbent members from the viewpoint of ensuring a sufficient absorbing ability. In this case, the number of the absorbing members to be laminated is not particularly limited. For example, it is preferably two or more, more preferably three or more, more preferably four or more, and preferably ten or less.

The means for disposing the absorbent member on the inner wall of the core is not particularly limited. Examples of the disposable absorbent member include an adhesive tape, an adhesive, a magnet, and the like. The member is preferably fixed by an adhesive tape.

There is no particular limitation on the kind of the above-mentioned adhesive tape, and examples thereof include a paper adhesive tape, a cloth adhesive tape, a film adhesive tape and a special adhesive tape. Specific examples thereof include a cellophane tape, a cork adhesive tape, An OPP adhesive tape, an aluminum tape, a vinyl tape, a polyester tape, a polyethylene tape, a polypropylene tape, a polyimide tape, a gum tape, or a composite tape produced by combining two or more thereof. Of these, adhesive tapes made of polyethylene or polypropylene are preferred because they do not cause problems such as fragments of the adhesive tape adhering to the film and deteriorating the quality of the film, and are also excellent in waterproofness.

The film roll of the present invention may be transported or stored as it is, or it may be transported or stored in the form of a package packed with a packaging material. The use of the film in the film roll of the present invention is not particularly limited. However, according to the present invention, since the effect of condensation is small and excellent film quality can be maintained, a fabric film for producing an optical film such as a polarizing film As shown in Fig.

Example

Hereinafter, the present invention will be described concretely with examples and the like, but the present invention is not limited at all by these examples. The evaluation methods of the dew condensation on the inner wall of the core, the outflow of condensation from the core, the dust observed on the inner wall of the core, and the fixability of the absorbent member, which are adopted in the following examples and comparative examples, are shown below.

Condensation on the inner wall of the core

The appearance of condensation on the inner wall of the core was evaluated by the following criteria.

○: The condensation is relatively small.

X: There is a relatively large number of condensation.

Leakage of condensation from the core

The outflow of condensation from the core was evaluated according to the following criteria.

?: No condensation from the end of the core is seen at all.

X: Outflow of condensation from the end of the core is seen.

Mine identified on the inner wall of the core

The dust identified on the inner wall of the core was evaluated according to the following criteria.

○: It is not possible to identify the dust with the naked eye.

X: The dust can be visually confirmed.

The stability of the absorbing member

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

∘: Fixed and does not move.

X: Moving and unstable.

[Example 1]

A PVA film having a film width of 3.3 m, a thickness of 60 탆 and a length of 12,500 m (a degree of saponification of PVA of 2,450 and a degree of saponification of PVA of 99.3 mol%) was made of aluminum and had a cylindrical shape with a length of 3.5 m, an outer diameter of 215 mm and a thickness of 6 mm And wound around the center of the core. Thereafter, four sheet-like nonwoven fabrics ("Dust tackle" wipers made by Kuraray Co., Ltd., length 33 cm x width 33 cm) made of cellulose-based synthetic fibers were superimposed and two sheets were prepared. Likewise, they were each fixed to the lower part of the inner wall at both ends of the core with an adhesive tape. The fixing position of the nonwoven fabric was set at a position 20 cm apart in the axial direction at each end (the shortest distance from the end of the core to the absorbent member was 20 cm). As the adhesive tape, a tape made of polyethylene was used. The mass of the film roll thus obtained was 3,600 kg.

The above-mentioned film rolls were stored for 10 hours or less at 10 占 폚 or lower, and then left for a predetermined time in an atmosphere in which condensation occurred at 20 占 폚 or higher. The results are shown in Table 1.

[Example 2]

The same procedure as in Example 1 was carried out except that four sheet nonwoven fabrics made of cellulose-based synthetic fibers were used instead of four sheets of cellulose-based natural fibers (wool, 30 cm long × 30 cm wide wool) To obtain a film roll. The film roll was evaluated in the same manner as in Example 1. The results are shown in Table 1.

[Example 3]

A film roll was obtained in the same manner as in Example 1 except that the length of the PVA film was changed from 12,500 m to 1,000 m. Furthermore, the mass of the film roll was 300 kg. The film roll was evaluated in the same manner as in Example 1. The results are shown in Table 1.

[Comparative Example 1]

A film roll was obtained in the same manner as in Example 1 except that no nonwoven fabric was used. The film roll was evaluated in the same manner as in Example 1. The results are shown in Table 1.

1: Core
2: inner wall of core
3: absorptive member
4: One end of the core
5: One end of the core

Claims (13)

A film roll comprising a cylindrical core wound with a film, the film roll having an absorbent member on the inner wall of the core. The method according to claim 1,
And an absorbent member on the inner wall of both ends of the core. 3. The method according to claim 1 or 2,
And an absorbent member at the bottom of the inner wall of the core. 4. The method according to any one of claims 1 to 3,
Wherein the distance from the end of the core to the absorbent member is 10 cm or more. 5. The method according to any one of claims 1 to 4,
Wherein the absorbent member contains at least one member selected from the group consisting of cellulose-based synthetic fibers and polyester-based fibers. 6. The method according to any one of claims 1 to 5,
Wherein a plurality of absorbing members are laminated. 7. The method according to any one of claims 1 to 6,
And the absorbing member is fixed to the inner wall of the core by an adhesive tape. 8. The method of claim 7,
Wherein the adhesive tape is made of polyethylene or polypropylene. 9. The method according to any one of claims 1 to 8,
Film rolls with cores of metal or plastic. 10. The method according to any one of claims 1 to 9,
Wherein the axial length of the core is at least 2.5 m. 11. The method according to any one of claims 1 to 10,
Wherein the film is a polyvinyl alcohol film. 12. The method according to any one of claims 1 to 11,
A film roll having a mass of 500 kg or more. 13. The method according to any one of claims 1 to 12,
A film roll having a length of at least 2,000 m.

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