WO2012060142A1

WO2012060142A1 - Film roll packing body and manufacturing method of same

Info

Publication number: WO2012060142A1
Application number: PCT/JP2011/068613
Authority: WO
Inventors: 彰一杉谷
Original assignee: コニカミノルタオプト株式会社
Priority date: 2010-11-02
Filing date: 2011-08-17
Publication date: 2012-05-10
Also published as: JPWO2012060142A1

Abstract

Provided is a packing technique for a film roll which is capable of attaining suppression of degradation and an increase in width of a film at the same time. To attain the purpose, a film roll packing body is provided with a film roll obtained by rolling up a film around a rolling core into a roll shape and one film-shaped body that covers an outer circumferential surface and both end surfaces of the entire film on the film roll, a width of the film in a short-side direction is 1800 to 4000 mm inclusive, a long-side direction of the film is a direction along a circumferential direction of the rolling core, and a degree of moisture transmission of the one film-shaped body is 1 g/m²∙24h or less.

Description

Film roll package and manufacturing method thereof

The present invention relates to a technique for packaging a roll film with a packaging film.

In recent years, thinning of liquid crystal display devices (LCD) has been promoted, and thinning is also required for polarizing plates used in LCDs. Accordingly, a film for protecting the polarizing plate (also referred to as a polarizing plate protective film) is required to be thin and improve productivity.

In this optical film such as a polarizing plate protective film, in the form of a roll in which the optical film is wound (also referred to as a film roll), sticking between optical films due to so-called blocking, etc., and wrinkles due to foreign matters, etc. Deterioration is likely to occur due to the occurrence. And by this deterioration, the external appearance of the optical film, optical characteristics, etc. may be impaired, and the quality sufficient to be provided to the optical film may be impaired.

In order to solve this problem, a technique in which a film roll is packaged with a packaging material has been proposed. For example, a technique has been proposed in which a cellulose film is stored in a state of being packaged with a packaging material having a moisture permeability of 1 g / m ² or less per day as defined by Japanese Industrial Standard (JIS) Z0208 ( For example, Patent Document 1). Thereby, the generation | occurrence | production of the damage | wound and sticking in an optical film may be suppressed.

In addition, there is a technique in which an optical film (film roll) wound around a core is wrapped with a packaging material, and an adhesive tape is attached to a joint portion between the packaging materials and a joint portion between the core and the packaging material. This has been proposed (for example, Patent Document 2 etc.), thereby providing a sealed state with no substantial gap between the packaging materials and between the core and the packaging material. Occurrence can be suppressed.

JP 2004-189288 A JP 2005-104556 A

By the way, in recent years, further enlargement of the screen of the LCD is directed, and further widening of the optical film such as a polarizing plate protective film is demanded. As a result, the width of the optical film becomes too wider than the width of the film-shaped packaging material (also referred to as a packaging film), which may cause a problem that the optical film protrudes from the packaging film.

For example, at present, the width of a moisture-proof aluminum vapor-deposited film used as a packaging film is 2500 mm or less, whereas for example, the width of an optical film is 1800 mm or more and the outer diameter (winding diameter) of a film roll is 400 mm. When it becomes above, a film roll cannot be packaged with one packaging film.

Therefore, it is conceivable to wrap the entire film roll with two wrapping films. However, since water and the like enter from the gap between the two packaging films, the optical film is likely to deteriorate. In addition, by the widening of an optical film, the area which a film roll and a packaging film contact increases, and we are anxious also about the increase in sticking of a film roll and a packaging material.

Such problems are not limited to film rolls of optical films, but are common to film rolls of various films.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a film roll packaging technique capable of achieving both widening of a film and suppression of deterioration.

More specifically, the first object is to provide a technique capable of achieving both widening and moisture prevention in a film. A second object is to provide a technique capable of suppressing sticking between a film roll and a packaging film.

In order to solve the above problems, a film roll packaging body according to a first aspect includes a film roll in which a film is wound in a roll shape around a core, and an outer peripheral surface and both ends of the entire film in the film roll. A width of the film in the short direction is not less than 1800 mm and not more than 4000 mm, and the longitudinal direction of the film is in the circumferential direction of the core And the moisture permeability of the one film-like body is 1 g / m ² · 24 h or less.

The film roll packaging body according to the second aspect is the film roll packaging body according to the first aspect, wherein the one film-like body has a curl in the longitudinal direction. When a portion covering the outer peripheral surface of the film-like body is viewed through a plane, the circumferential direction of the outer peripheral surface and the longitudinal direction of the one film-like body are orthogonal to each other.

The film roll packaging body according to the third aspect is the film roll packaging body according to the second aspect, wherein the elastic modulus in the lateral direction is larger than the elastic modulus in the longitudinal direction in the film, When the elastic modulus in the short side direction is larger than the elastic modulus in the longitudinal direction in the film-shaped body, and the portion covering the outer circumferential surface of the one film-shaped body is seen through the plane, the outer circumferential surface The longitudinal direction of the film is perpendicular to the longitudinal direction of the one film-like body.

The film roll packaging body according to the fourth aspect is the film roll packaging body according to any one of the first to third aspects, wherein the one film-like body is two or more film-like bodies. The body is welded.

The package of the film roll according to the fifth aspect is the package of the film roll according to any one of the first to fourth aspects, wherein the maximum value of the outer diameter of the film roll is 400 mm or more and 1000 mm or less.

The film roll packaging body according to the sixth aspect is the film roll packaging body according to any one of the first to fifth aspects, wherein the film roll has a solvent content of 0.1 in the film roll. % Or less.

The film roll packaging body according to a seventh aspect is the film roll packaging body according to any one of the first to sixth aspects, wherein the winding core is configured using a fiber reinforced plastic, The outer diameter of the winding core is 250 mm or more.

A film roll packaging body according to an eighth aspect is the film roll packaging body according to any one of the first to seventh aspects, wherein the outer periphery of the film roll is defined by measurement with a durometer. Is 80 or more and 98 or less.

The package body of the film roll which concerns on a 9th aspect is a film | membrane form which has covered the film roll by which a film is wound by roll shape centering on a core, and the outer peripheral surface and edge part of the film part in the said film roll. Body, the film-shaped body has a curl in one direction, and a portion of the film-shaped body that covers the outer peripheral surface is viewed in plane, the circumferential direction of the outer peripheral surface And one direction of the film-like body are orthogonal to each other.

The film roll packaging body according to a tenth aspect is the film roll packaging body according to the ninth aspect, wherein the film has an elastic modulus in a short direction larger than an elastic modulus in a longitudinal direction. When the elastic modulus in the one direction in the body is smaller than the elastic modulus in the other direction orthogonal to the one direction, and the portion covering the outer peripheral surface of the film-like body is seen through the plane, the outer peripheral surface The longitudinal direction of the film and the one direction of the film-like body are orthogonal to each other.

A film roll packaging body manufacturing method according to an eleventh aspect includes: (a) a film roll in which a film having an elastic modulus in a short side direction larger than an elastic modulus in a longitudinal direction is wound around a core. And (b) a film-like body having curl in one direction, and when the film-like body is seen through a plane, the circumferential direction on the outer peripheral surface of the film portion of the film roll and the film-like shape Covering the outer peripheral surface and the end surface of the film portion so that one direction of the body is orthogonal.

The film roll packaging body manufacturing method according to the twelfth aspect is a film roll packaging body manufacturing method according to the eleventh aspect, wherein (c) the packaging film is formed in a roll shape centering on the core. A step of preparing a wrapped packaging film roll, and (d) drawing out a part of the packaging film from the packaging film roll and cutting the film-like body used in the step (b). A longitudinal direction of the packaging film in the packaging film roll and one direction of the film-like body cut out from the packaging film roll.

Since the film roll packaging body according to any of the first to ninth aspects can achieve both widening of the film and moisture proofing, widening of the film and suppression of deterioration can both be achieved.

Also by the film roll packaging body according to any of the second and third aspects, sticking between the film roll and the packaging film is suppressed, and both widening of the film and suppression of deterioration can be achieved.

According to the packaging body of the film roll according to the sixth aspect, sticking between the films in the film portion of the film roll and between the film portion and the packaging film is suppressed.

According to the packaging body of the film roll according to the seventh aspect, sticking of the films to each other in the cramped portion is suppressed by strengthening the core.

According to the film roll packaging body according to the eighth aspect, an increase in the contact area between the film roll and the packaging film is suppressed, and sticking between the film and the packaging film is suppressed.

Also by the film roll packaging body according to any of the ninth and tenth aspects, sticking between the film roll and the packaging film can be suppressed, and both widening of the film and suppression of deterioration can be achieved.

The film roll package manufacturing method according to any of the eleventh and twelfth aspects can also suppress sticking between the film roll and the packaging film, and achieve both widening of the film and suppression of deterioration.

Drawing 1 is a mimetic diagram showing the appearance of the package of the film roll concerning one embodiment. Drawing 2 is a mimetic diagram showing the section of the packaging body of the film roll concerning one embodiment. FIG. 3 is a schematic diagram illustrating a process of preparing the inner packaging film. FIG. 4 is a schematic diagram showing a process of packaging a film roll with an inner packaging film.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, parts having the same configuration and function are denoted by the same reference numerals, and redundant description is omitted in the following description. Further, the drawings are schematically shown, and the sizes, positional relationships, and the like of various structures in the drawings are not accurately illustrated.

<(1) Overall configuration of film roll packaging>
FIG. 1 is a schematic diagram illustrating an appearance of a film roll package 100 according to an embodiment, and FIG. 2 is a schematic diagram illustrating a cross section of the film roll package 100.

1 and 2, the film roll package 100 is obtained by packaging a film roll 10 with a packaging film 3 (also referred to as a packaging film).

The film roll 10 has a cylindrical core 1 and a film portion 2 around which the optical film is wound around the core 1.

The core 1 has portions (also referred to as protruding portions) that protrude from both side surfaces of the film portion 2 in the axial direction of the core 1 (also referred to as the core axial direction). The core 1 is preferably configured using fiber reinforced plastic (FRP) from the viewpoint of weight reduction and strength maintenance.

Further, the outer diameter of the core 1 is preferably 250 mm or more from the viewpoint of securing strength according to the widening of the optical film. Due to the strengthening of the core 1, the occurrence of a problem in which the core 1 is bent by the weight of the film portion 2 to cause local buckling in the film portion 2 is suppressed. For this reason, the sticking of the optical films in this buckling location is suppressed. However, the outer diameter of the core 1 is preferably 400 mm or less from the viewpoints of space saving of the apparatus for manufacturing the film roll 10 and ease of transportation of the film roll 10. In addition, it is preferable that the thickness of the core 1 is 5 mm or more and 20 mm or less, for example.

The film portion 2 has a form in which optical films having a substantially constant width and thickness are stacked concentrically around the core 1. Here, the optical film is wound around the core 1 so that the longitudinal direction of the optical film is along the circumferential direction of the core 1.

As an optical film, for example, a substantially constant thickness in a range of 20 μm or more and 85 μm or less, a substantially constant short-side length (also referred to as a width) in a range of 1800 mm or more and 4000 mm or less, and 1000 m or more. And a cellulose ester film having a length in the longitudinal direction (also simply referred to as “length”) in the range of 10,000 m or less. An optical film having a width of 1800 mm or more and 4000 mm or less is wider than that generally produced commercially. Moreover, the outer diameter of the film part 2 becomes the maximum in a part subjected to knurling which will be described later, and the maximum value of the outer diameter (also referred to as the maximum diameter) is also the maximum value of the outer diameter of the film roll 10, for example, The desired value is in the range of 400 mm or more and 1000 mm or less.

In the cellulose ester film, moisture easily penetrates and sticking due to moisture is relatively easy to occur. However, it is also assumed that moisture enters between the films of the film portion 2 from the side. For this reason, the optical film which comprises the film part 2 is not restricted to a cellulose-ester film, A various optical film may be sufficient. Examples of the optical film include a polarizing plate protective film used for liquid crystal display panels, a polarizing film, a retardation film, an antireflection film, an alignment film, an antireflection film used for a plasma display panel, and an electromagnetic shielding film. It is done.

The packaging film 3 is a film-like thing (also called a film-like body) that covers the film roll 10 to protect the film roll 10 from moisture and foreign matter.

And the part which the edge part of this packaging film 3 overlaps on the packaging film 3, and mutually contacts is joined by sticking of the adhesive tape 4, and the contact part of the packaging films 3 was closed without gap. It is sealed. In addition, at both ends in the axial direction of the film roll package 100, the portions where the end of the packaging film 3 and the core 1 are in contact with each other are bonded together by applying the adhesive tape 4. It is set as the sealing state closed between 1 and without gap. That is, a sealed state in which the film portion 2 is surrounded by the core 1 and the packaging film 3 is formed. The adhesive tape 4 is not particularly limited as long as it can adhere the packaging film 3.

Specifically, the entire cylindrical outer surface (that is, outer peripheral surface) and both outer surfaces (that is, both side surfaces) of the film portion 2 are covered with the packaging film 3. And the both ends in the circumferential direction of the film part 2 of the packaging film 3 are mutually overlapped, and the adhesive tape 4 is affixed on this overlapped part. Thereby, it will be in the state by which the clearance gap was substantially plugged up in the contact part of the packaging films 3. FIG.

Moreover, the outer peripheral surface of the both ends 1a in the core axial direction of the winding core 1 and both ends (also referred to as side end portions) in the core axial direction of the packaging film 3 are brought into contact, and an adhesive tape is attached to the contact portion. 4 is pasted. Thereby, each clearance gap between the outer peripheral surface of the both ends 1a of the winding core 1 and the side both ends of the packaging film 3 will be in the substantially closed state.

By the way, as shown in FIG. 2, the packaging film 3 includes an inner packaging film (also referred to as an inner packaging film) 3a that directly covers the film roll 10 and an outer packaging film 10 that further covers the film roll 10 from above the inner packaging film 3a. And a packaging film (also referred to as an outer packaging film) 3b. That is, the film roll package 100 has the film portion 2 covered twice in this order by the inner packaging film 3a and the outer packaging film 3b.

Specifically, the outer peripheral surface and both side surfaces of the entire film portion 2 are covered with the inner packaging film 3a, and both end portions in the circumferential direction of the film portion 2 of the inner packaging film 3a are overlapped with each other. The adhesive tape 4 is affixed to the part. Then, both end portions (also referred to as side end portions) in the core axial direction of the inner wrapping film 3a are folded inward and fixed to the both end portions 1a of the core 1 by the stoppers 5 respectively. Yes. Thereby, the contact part of the films in the inner side packaging film 3a, and the space | interval between the core 1 and the inner side packaging film 3a are closed without gap.

Further, the entire outer peripheral surface and both side surfaces of the inner packaging film 3a are covered with the outer packaging film 3b, and both end portions in the circumferential direction of the film portion 2 of the outer packaging film 3b are overlapped with each other. Adhesive tape 4 is affixed to the formed part. And the both ends 1a of the core 1 protrude from the both side surface parts of the inner side packaging film 3a, the outer peripheral surface of this both end parts 1a and the side both ends of the outer side packaging film 3b are made to contact, The adhesive tape 4 is affixed. Thereby, the clearance gap between the outer peripheral surface of the both ends 1a of the winding core 1 and the side both ends of the outer side packaging film 3b will be in the substantially closed state.

In this way, even if the film roll 10 is an optical film having a width of 1800 mm or more and 4000 mm or less, the outer peripheral surface and both side surfaces of the entire film portion 2 are formed by one inner packaging film 3a. Covered. Thereby, widening of an optical film and moisture prevention can be compatible. And in the film roll 10, it becomes difficult for a water | moisture content to permeate into the clearance gap between optical films, and sticking of optical films becomes difficult to produce. That is, both the widening of the optical film and the suppression of deterioration can be achieved.

In addition, the packaging method using the inner side packaging film 3a and the outer side packaging film 3b is not limited to what was shown by FIG. 1 and FIG.

<(2) Packaging film>
The inner packaging film 3a has a moisture permeability (also referred to as water vapor permeability) of 1 g / m ² · 24h or less, and the outer packaging film 3b has a moisture permeability of 10 g / m ² · 24 h or less. in use. By wrapping the film part 2 with the inner wrapping film 3a and the outer wrapping film 3b having excellent moisture resistance, moisture proofing or the like in the film part 2 is achieved.

Note that the moisture permeability generally corresponds to the amount of water vapor that passes through a sample of a unit area per unit time under predetermined temperature and humidity conditions. The “moisture permeability” in the present specification indicates that measured by the cup method using calcium chloride specified by Z0208 of Japanese Industrial Standard (JIS), and the temperature is 40 ° C. and the humidity is 90%. It is defined by the amount of water vapor that permeates through the film when held in an RH environment for 1 day (also referred to as the amount of permeated water vapor).

Examples of the material of the inner packaging film 3a include a composite material in which a polyolefin-based synthetic resin film such as polyethylene and polypropylene and a polyester-based synthetic resin film such as polyethylene terephthalate and polyethylene naphthalate are laminated. It is done. Furthermore, a composite material in which a thin film of a metal such as aluminum is laminated on the composite material film by vapor deposition or bonding may be employed. Since these composite materials are lightweight, they are suitable in terms of ease of handling and transportation.

The thickness of the inner packaging film 3a made of such a composite material is preferably 1 μm or more from the viewpoint of maintaining moisture permeability, while it is preferably 50 μm or less from the viewpoint of handling such as rigidity. . And since the moisture permeability of the inner side packaging film 3a changes according to the thickness of each layer of a composite material, the moisture permeability of the inner side packaging film 3a is adjusted suitably by adjustment of the thickness of each layer.

By the way, although the inner wrapping film 3a is composed of a single film-like body, two or more film-like bodies may be formed into a single film-like body by welding. That is, the inner packaging film 3a may be substantially constituted by a single film-like body. As welding, welding using heat (also referred to as thermal welding), welding using ultrasonic waves (also referred to as ultrasonic welding), welding using vibration (also referred to as vibration welding), welding using electromagnetic induction ( And welding using high frequency (also referred to as high frequency welding).

Examples of the material of the outer packaging film 3b include a film of a polyolefin-based synthetic resin such as polyethylene and polypropylene, and a film of a polyester-based synthetic resin such as polyethylene terephthalate and polyethylene naphthalate.

The thickness of the outer packaging film 3b is preferably 10 μm or more from the viewpoint of maintaining moisture permeability, and is preferably 100 μm or less from the viewpoint of handling such as rigidity. Moreover, the moisture permeability of the outer side packaging film 3b changes according to the thickness of the synthetic resin film which comprises the outer side packaging film 3b. For this reason, the moisture permeability of the outer packaging film 3b is appropriately adjusted by adjusting the thickness of the synthetic resin film.

In addition, from the viewpoint of preventing deterioration of the film roll 10 in a distribution state such as storage and transportation, the moisture permeability of the outer packaging film 3b is preferably 5 g / m ² · 24 h or less, preferably 1 g / m ² · 24 h or less. More preferably it is. At this time, as the material of the outer packaging film 3b, the same material as that of the inner packaging film 3a may be used.

<(3) Production of film roll>
As a manufacturing method of the optical film which comprises the film roll 10, what uses the solution casting film forming method and the melt casting film forming method is mentioned, for example.

In a film manufacturing method using the solution casting film forming method, a thermoplastic resin solution (also referred to as a thermoplastic resin solution or a dope) is used as a raw material for manufacturing the film. Then, the dope is cast on the surface (also referred to as a casting surface) of a support made of a metal or an alloy to produce a thermoplastic resin film (also referred to as a casting film). The cast film is cooled and dried to some extent, and then peeled off from the support to form a web. After the web is appropriately dried, stretched, cooled, etc., the film is wound by a winder. Is manufactured.

On the other hand, in the method for producing an optical film using the melt casting method, a liquid in which a thermoplastic resin is melted as a raw material for producing an optical film instead of a dope (also referred to as a thermoplastic resin melt) Is used. In addition, in the film roll 10 manufactured by the melt casting film forming method, the content rate of the solvent in an optical film is 0.1% or less.

From the viewpoints of suppression of sticking between optical films and suppression of sticking between the optical film and the inner packaging film 3a, the film roll 10 manufactured by any film forming method has a solvent content in the optical film. It is preferably 0.1% or less.

Hereinafter, an example of a method for producing an optical film on the premise that the film roll 10 is produced using a solution casting film forming method will be described.

<(3-1) Dope>
The dope is a viscous fluid in which a thermoplastic resin and necessary additives are dissolved or dispersed in a solvent.

Examples of the thermoplastic resin include cellulose esters such as cellulose triacetate (TAC) and cellulose acetate propionate (CAP).

As the solvent, for example, a mixture of a good solvent and a poor solvent is preferable. When the thermoplastic resin is a cellulose ester, for example, the good solvent may be methylene chloride or the like, and the poor solvent may be methanol, ethanol or the like.

The additive may be, for example, a plasticizer, an ultraviolet absorber, fine particles, or the like. Examples of the plasticizer include phosphate ester type plasticizers. Examples of the ultraviolet absorber include benzotriazole-based compounds and the like, and those having an excellent ability to absorb ultraviolet rays having a wavelength of 370 nm or less and a low ability to absorb visible light having a wavelength of 400 nm or more are preferable. Examples of the fine particles include fine particles such as a matting agent for improving slipperiness and suppressing blocking after winding, and examples thereof include fine particles of a compound containing silicon dioxide. Furthermore, other additives for reducing retardation (Rt) in the thickness direction may be added to the dope.

As a solvent for dissolving the thermoplastic resin, for example, a solvent in which methylene chloride is mixed in a ratio of 70% by weight or more and 95% by weight or less and other solvents are mixed in a ratio of 5% by weight or more and 30% by weight or less (also referred to as a mixed solvent). ) Is preferably used. And in a container, a mixed solvent is added with respect to a thermoplastic resin, and a thermoplastic resin is melt | dissolved by heating in the range which a solvent does not boil. The solution (dope) produced by dissolving the thermoplastic resin with the solvent is taken out of the container while being cooled, or extracted from the container with a pump or the like and cooled with a heat exchanger or the like, and then formed into a film. Provided.

Additives such as plasticizers, ultraviolet absorbers, and fine particles may be previously introduced into the solvent and dissolved or dispersed before the thermoplastic resin is dissolved in the solvent, or the thermoplastic resin is dissolved in the solvent. It may be put into a solution produced by In order to make the water absorption rate and moisture content within specific ranges, the amount of plasticizer added is preferably 12% by weight or less based on the thermoplastic resin. The addition amount of the fine particles is 0.04% by weight or more and 0.4% by weight or less, preferably 0.05% by weight or more and 0.3% by weight or less, more preferably 0%, based on the thermoplastic resin. .05 wt% or more and 0.2 wt% or less.

<(3-2) Casting process>
In the step of casting the dope on the support (also referred to as a casting step), a support having a mirror-finished outer surface of a belt-shaped or drum-shaped stainless steel is preferably used. The temperature of the support in the casting process is set to a general temperature range from 0 ° C. to less than the boiling point of the solvent. From the viewpoint of shortening the minimum time required for casting the dope on the support and separating the dope from the support as a web (that is, the separation limit time), the support in the casting process is performed. The body temperature is preferably 5 ° C or higher and 30 ° C or lower, more preferably 5 ° C or higher and 15 ° C or lower.

<(3-3) Drying step in support>
In the step of drying the cast film on the support (also referred to as the cast film drying step), when the dope is cast and once gelled, the time from casting to peeling is defined as 100. The temperature of the drying air is preferably 40 ° C. or higher and 70 ° C. or lower, more preferably 55 ° C. or higher and 70 ° C. or lower, within a period of 30 minutes from the beginning. As a result, the evaporation of the solvent is promoted, and the peeling limit time is shortened and the strength of the cast film when peeled is increased. The drying air is preferably maintained at a temperature of 40 ° C. or higher and 70 ° C. or lower (more preferably 55 ° C. or higher and 70 ° C. or lower) for 20 or more hours, and further for 40 or more hours. Is preferred.

<(3-4) Peeling step>
In the step of peeling the casting film from the support (also referred to as peeling step), from the viewpoint of ease of peeling, the solvent occupying the casting film when the weight of the thermoplastic resin occupying the casting film is 100. Is preferably 60 or more and 150 or less, more preferably 80 or more and 120 or less. Further, in the peeling step, from the viewpoint of preventing the casting film from being broken by ensuring the strength of the casting film, the temperature of the casting film is preferably 0 ° C. or more and 30 ° C. or less, preferably 5 ° C. or more. And it is preferable that it is 20 degrees C or less.

<(3-5) Web drying process>
In the step of further drying the cast film (that is, the web) peeled off from the support (also referred to as a web drying step), the weight of the solvent occupying the web is 100 when the weight of the thermoplastic resin occupying the web is 100. The web is dried until it is 3 or less. From the viewpoint of stabilizing the size of the web (that is, the optical film) after drying, in the web drying step, the weight of the solvent occupying the web is dried to 1 or less when the weight of the thermoplastic resin occupying the web is 100. It is preferable to dry to 0.5 or less.

In the web drying process, generally, the web is dried while being conveyed by a roll suspension method, a pin tenter method, or a clip tenter method. In this web drying step, the web dimensions are stabilized by drying while maintaining the width by the tenter method. And in particular, in the tenter, the web is stretched in the width direction (short direction), so in the optical film after winding, the elastic modulus in the short direction (also referred to as TD direction) (also referred to as TD elastic modulus). However, it becomes larger than the elastic modulus (also referred to as MD elastic modulus) in the longitudinal direction corresponding to the conveying direction (also referred to as MD direction).

Generally, hot air, infrared rays, heating rolls, microwaves, etc. are employed as means for drying the web. In addition, it is preferable that a hot air is employ | adopted from a viewpoint of simplicity. The temperature at which the web is exposed in the web drying process (drying temperature) is 3 to 5 stages in a temperature range of 40 ° C. or higher and 150 ° C. or lower. It is preferred that it be increased. Further, from the viewpoint of web dimension stability, it is preferable to employ a temperature range of 80 ° C. or higher and 140 ° C. or lower as the drying temperature.

In addition, after drying, so-called knurling was applied to the vicinity of both ends in the width direction of the web so as to be embossed with a width of about 10 mm and a height of about 8 μm.

<(3-6) Atmosphere>
The atmosphere in which the processes from the casting process to the web drying process are performed may be normal air (that is, air), or may be an inert gas such as nitrogen gas.

<(3-7) Winding process>
The film roll 10 is manufactured by winding the optical film around the core 1 by the winder. At this time, since the knurling is performed, sticking between the optical films is suppressed. And in the case of this winding-up, from the viewpoint of sticking suppression of optical films and sticking suppression of an optical film and the inner packaging film 3a, in the film part 2 of the film roll 10, inclusion of the solvent in the optical film The rate is preferably 0.1% or less.

The winder may be a commonly used one as long as it can be wound by a winding method such as a constant tension method, a constant torque method, a taper tension method, or a program tension control method with a constant internal stress. good. In addition, the environmental conditions at the time of winding up the formed optical film in roll shape should just be temperature 25 degrees C or less and humidity 50% RH or less (preferably humidity is 40% RH or less).

Further, from the viewpoint of suppressing winding rubbing during winding and deformation due to the weight of the film roll 10 after winding, as a winding method, the film is wound more firmly by pressing a so-called touch roll. It is preferable to adopt a method.

In this method, it becomes difficult for air to be caught between the films laminated in the film portion 2 by the pressing force of the touch roll. For this reason, the increase in the contact area of the film part 2 and the inner side packaging film 3a resulting from shape loss is suppressed, and sticking with an optical film and the inner side packaging film 3a is suppressed. However, when the optical film is wound up excessively, sticking of the optical film is likely to occur.

As for the appropriate hardness of winding, for example, the hardness of the outer peripheral part of the film part 2 (that is, the outer peripheral surface of the film part 2) is 80 or more and 98 or less by measurement using a durometer. Is preferred. Here, if the hardness of the outer peripheral surface of the film portion is less than 80, the tension applied to the optical film during winding is reduced. At this time, air is present between the films laminated in the film portion immediately after winding, but when left for several hours thereafter, air is released from between the films and the film portion is deformed. Due to this deformation, when a film roll is used, an undesired problem such as failure of the optical film may occur. On the other hand, if the hardness of the outer peripheral surface of the film portion exceeds 98, the tension applied to the optical film during winding is increased. At this time, sticking between films laminated in the film portion is likely to occur. Due to this sticking, when a film roll is used, the optical film is likely to be deformed and torn, and an undesired problem that the use of the optical film becomes difficult may occur. As the durometer, for example, a durometer (GS-719R) manufactured by Teclock Co., which satisfies the measurement method defined by K6253 of the Japanese Industrial Standard (JIS), is preferably employed. The hardness in the vertical direction is measured.

<(4) Production of film roll package>
The manufacturing process of the film roll package 100 includes, for example, (I) a process in which the film roll 10 is prepared by the above manufacturing process, (II) a process in which a packaging film roll as a base of the packaging film 3 is prepared, III) A process of preparing the packaging film 3 and (IV) a process of packaging the film roll 10 by the packaging film 3.

Since step (I) has already been described, steps (II) to (IV) will be described here.

<(4-1) Preparation of packaging film roll>
The packaging film that is the basis of the packaging film 3 is prepared, for example, in the form of a roll (also referred to as a packaging film roll) 30 (FIG. 3) that is wound around a roll core. In the packaging film roll 30, the packaging film, like the optical film, has a substantially constant thickness, a substantially constant lateral length (also referred to as a width), and a longitudinal direction that is much longer than the lateral direction. (Also simply referred to as “length”). And in the packaging film roll 30, the film for packaging is wound by roll shape centering | focusing on the core so that the longitudinal direction of the film for packaging may follow the circumferential direction of a core.

The packaging film roll 30 is manufactured while being appropriately stretched in the width direction by a tenter or the like in the manufacturing process, like the film roll 10 of the optical film. For this reason, in the packaging film roll 30, in the packaging film, the elastic modulus (TD elastic modulus) in the short direction (also referred to as the TD direction) corresponds to the elastic modulus in the longitudinal direction corresponding to the transport direction (also referred to as the MD direction). It is larger than (MD elastic modulus).

<(4-2) Preparation of packaging film>
FIG. 3 is a diagram for explaining a process of preparing the packaging film 3 (specifically, the inner packaging film 3a). In addition, the process of preparing the inner side packaging film 3a and the process of preparing the outer side packaging film 3b are substantially the same. For this reason, the process in which the inner side packaging film 3a is prepared is demonstrated as a typical example here.

As shown in FIG. 3, a part of the packaging film is pulled out from the packaging film roll 30, and the packaging film is cut along a cutting line 32 indicated by a one-dot chain line. As a result, an inner packaging film 3a having a length in the longitudinal direction (MD direction) indicated by the arrow 3md of 3L and a length (width) in the short direction (TD direction) indicated by the arrow 3td of 3W is obtained. Here, there is a relationship of length 3L> width 3W.

Therefore, the longitudinal direction of the packaging film in the packaging film roll 30 coincides with the longitudinal direction of the inner packaging film 3 a cut out from the packaging film roll 30. And the transversal direction of the film for packaging in the packaging film roll 30 and the transversal direction of the inner side packaging film 3a correspond.

<(4-3) Film roll packaging>
FIG. 4 is a schematic diagram showing a process of packaging the film roll 10 with the packaging film 3 (specifically, the inner packaging film 3a). In addition, although the packaging by the inner side packaging film 3a and the packaging by the outer side packaging film 3b are performed sequentially, the process itself is similar. For this reason, here, as a representative example, a process of packaging the film roll 10 with the inner packaging film 3a will be described.

Also, in FIG. 4, the film roll 10 is indicated by a broken line, the longitudinal direction (MD direction) of the optical film on the outer peripheral surface of the film portion 2 is indicated by a dashed arrow 2 md, and the short of the optical film on the outer peripheral surface of the film portion 2. The hand direction (TD direction) is indicated by a dashed arrow 2td.

In the process of packaging the film roll 10, for example, as shown in FIG. 4, first, the inner packaging film 3a is placed in a flat shape. Next, the film roll 10 is placed on the inner packaging film 3a. And the outer peripheral surface and both ends of the whole film part 2 are packaged by the inner side packaging film 3a. Thereby, the film roll package 100 is completed.

By the way, the inner side packaging film 3a takes over the shape in the packaging film roll 30, and is easy to bend in one direction along the longitudinal direction. That is, the inner packaging film 3a has a so-called curl in the longitudinal direction. As used herein, “winding folds” mean that even if the inner packaging film 3a is spread out in a flat shape, the inner packaging film 3a is not maintained in a flat shape and tends to bend toward one main surface in the longitudinal direction. It is a characteristic.

For this reason, if the longitudinal direction of the inner side packaging film 3a and the longitudinal direction of the optical film in the outer peripheral surface of the film part 2 become substantially parallel in the film roll package 100, the inner side packaging film 3a becomes a film by curling. It becomes easy to adhere to the film part 2 along the outer peripheral surface of the part 2, and it becomes easy to stick to the film part 2.

Therefore, as shown in FIG. 4, when the portion of the inner packaging film 3 a that covers the outer peripheral surface of the film portion 2 is seen through, the longitudinal direction of the optical film on the outer peripheral surface of the film portion 2 (broken arrow 2 md And the longitudinal direction of the inner packaging film 3a (the direction indicated by the arrow 3md) are preferably orthogonal to each other. The longitudinal direction of the optical film on the outer peripheral surface of the film portion 2 coincides with the circumferential direction of the outer peripheral surface. From another viewpoint, when the portion of the inner wrapping film 3a that covers the outer peripheral surface of the film portion 2 is viewed in plan, the short direction of the optical film on the outer peripheral surface of the film portion 2 (shown by the dashed arrow 2td). Direction) and the short direction of the inner packaging film 3a (the direction indicated by the arrow 3td) are preferably orthogonal.

This makes it difficult for the inner wrapping film 3 a to adhere to the outer peripheral surface of the film portion 2 along the circumferential direction of the film portion 2. For this reason, sticking with the film part 2 and the inner side wrapping film 3a is suppressed, and widening of an optical film and suppression of deterioration can be compatible.

From the viewpoint of obtaining such actions and effects, when the portion of the inner packaging film 3a that covers the outer peripheral surface of the film portion 2 is viewed in plane, the circumferential direction of the outer peripheral surface of the film portion 2 and the inner side The longitudinal direction of the packaging film 3a does not need to be strictly orthogonal, and may be at least not parallel, or may intersect with a certain degree of inclination. However, when the shape of the outer edge of the inner packaging film 3a (in this case, a rectangle) and the shape of the film roll 10 are taken into consideration, the film portion 2 of the inner packaging film 3a has a viewpoint of efficiency and workability in packaging. When the portion covering the outer peripheral surface is seen through on a plane, it is preferable that the circumferential direction of the outer peripheral surface of the film portion 2 and the longitudinal direction of the inner packaging film 3a are substantially orthogonal.

If attention is paid only to the suppression of sticking between the films due to the longitudinal crossing between the optical film and the inner wrapping film 3a, the inner wrapping film 3a is not composed of a single film, but a plurality of sheets. These films may be connected by a tape or the like.

<(5) Others>
In addition, this invention is not limited to the above-mentioned embodiment, A various change, improvement, etc. are possible in the range which does not deviate from the summary of this invention.

For example, in the above embodiment, the gap between the core 1 and the packaging film 3 is sealed so that the film portion 2 is protected from moisture, but the present invention is not limited thereto. For example, the film portion 2 may be surrounded only by the packaging film 3, or the film portion 2 may be surrounded by a combination with other members. For example, the rubber plug is attached to both ends of the core, and the film portion 2 is surrounded by the combination of the rubber plug and the packaging film by sealing between the rubber plug and the packaging film. Conceivable.

Moreover, in the said embodiment, although the packaging film 3 had the double structure of the inner side packaging film 3a and the outer side packaging film 3b, it is not restricted to this, Even if it has a structure where the outer side packaging film 3b was abbreviate | omitted good.

In addition, when the film roll package 100 according to the above embodiment is transported, an auxiliary member such as a side pad may be applied to the side surface of the film roll package 100. Further, the film roll package 100 may be transported while being held in such a manner that the film portion 2 is supported by being suspended by supporting the core 1 from below or the like with a metal base and / or cardboard. .

Hereinafter, examples of the present invention will be described, but the present invention is not limited thereto.

<(A) Examples 1 to 18>
(A1. Preparation of dope)
The following amounts of TAC, solvent, and additives are put into a sealed container, and stirring is performed while maintaining the temperature at 80 ° C. under pressure, whereby TAC is completely dissolved and a TAC dope is prepared. It was.

Cellulose triacetate (TAC): 100kg
Tinuvin 326 (Ciba Specialty Chemicals): 0.2kg
Tinuvin 171 (Ciba Specialty Chemicals): 0.5kg
Tinuvin 109 (Ciba Specialty Chemicals): 0.5kg
Ethyl phthalyl ethyl glycolate (EPEG): 2.0 kg
Triphenyl phosphate (TPP): 8.0 kg
Aerosil 972V (Nippon Aerosil Co., Ltd.): 0.2kg
Methylene chloride: 440kg
Ethanol: 40 kg.

(A2. Production of film sample)
After the dope was filtered, a belt casting apparatus (not shown) was used, and the dope maintained at 33 ° C. was cast from a die onto a support made of a stainless steel endless belt. The dope formed a cast film on the support, and the cast film was dried and cooled for 60 seconds on the support, and was peeled from the support to form a web. The web was further dried while being conveyed on multiple rolls. At this time, drying was performed by the clip tenter while being stretched so that the width of the web became 1.5 times in the short direction of the web (that is, the width direction) perpendicular to the web conveyance direction. After this drying, knurling with a width of 10 mm and a height of 8 μm was applied to the vicinity of both ends in the width direction of the web.

Then, in an environment where the temperature is 24 ° C. and the humidity is 40% RH, the web is wound around in a roll shape with the cylindrical core as the center, thereby obtaining a TAC film having a thickness of 80 μm. This TAC film corresponds to the optical film of the film part 2 according to the embodiment.

Next, as shown in FIG. 3, a part of the packaging film was pulled out from the packaging film roll 30 and cut to obtain the inner packaging film 3a. Similarly, the outer packaging film 3b was also obtained. At this time, the inner side packaging film 3a and the outer side packaging film 3b had a curl in the longitudinal direction.

Next, as illustrated in FIG. 1, the outer peripheral surface and both side surfaces of the film portion 2 in the film roll 10 were packaged by the packaging film 3. At this time, on the outer peripheral surface of the film portion 2, the portion where the end of the packaging film 3 is superimposed on the surface of the packaging film 3 is joined by applying the adhesive tape 4 so that the contact portions between the packaging films 3 are joined. Closed substantially without gaps. Moreover, the part which the core 1 which protrudes from the both sides | surfaces of the film part 2 and the both ends of the packaging film 3 contact is joined by sticking of the adhesive tape 4, and between the packaging film 3 and the core 1 is attached. Closed without gaps. Thereby, the sealed state in which the film part 2 was surrounded by the core 1 and the packaging film 3 was formed.

Specifically, as shown in FIG. 2, the entire outer peripheral surface and both side surfaces of the film portion 2 were packaged so as to be covered with the inner packaging film 3a. Here, as the inner packaging film 3a, a composite material in which an aluminum thin film is laminated by vapor deposition on a composite material film in which a polyolefin-based synthetic resin film and a polyester-based synthetic resin film are laminated is employed. . Furthermore, the outer packaging film 3b was packaged so that the entire surface of the inner packaging film 3a was covered. In any of the examples, as the outer packaging film 3b, a polyolefin-based synthetic resin film having a moisture permeability of 10 g / m ² · 24 h was employed.

Here, as shown in Table 1 below, (Condition 1) Width of optical film, (Condition 2) Outer diameter of core 1, (Condition 3) Outer diameter (maximum diameter) of film roll 10, (Condition 4 ) Moisture permeability of the inner packaging film 3a, (Condition 5) Mutual relationship in the MD direction between the optical film and the inner wrapping film 3a, (Condition 6) Presence / absence of use of a touch roll during winding, (Condition 7) Film Examples 1 to 18 were produced by changing the hardness of the outer peripheral surface of the portion 2.

First, for condition 1, the width of the optical film was changed within the range of 1800 mm or more and 4000 mm or less. Specifically, the width of the optical film is 1800 mm in Examples 1 and 8, 2500 mm in Examples 2, 5, 6, and 9 to 18, 3000 mm in Example 3, and Examples 4 and 7 Then, it was set to 4000 mm.

For condition 2, the outer diameter of the core 1 was 167 mm or more and 308 mm or less. Specifically, the outer diameter of the core 1 is 167 mm in Examples 1 and 8, 308 mm in Examples 2 to 7 and 9 to 16, 256 mm in Example 17, and 231 mm in Example 18. It was said.

For condition 3, the maximum diameter of the film roll 10 was changed within a range of 417 mm or more and 979 mm or less. Specifically, the maximum diameter of the film roll 10 is 499 mm in Example 1, 551 mm in Examples 2 to 4, 9 to 18, 842 mm in Example 5, and 979 mm in Example 6. In Example 7, it was 440 mm, and in Example 8, it was 417 mm.

For condition 4, the moisture permeability of the inner packaging film 3a was 0.5 g / m ² · 24h in Examples 1 to 11 and 13 to 18, and 1.0 g / m ² · 24 h in Example 12. . The moisture permeability was measured by a cup method using calcium chloride specified by Z0208 of Japanese Industrial Standard (JIS). Specifically, the amount of water vapor (also referred to as the amount of permeated water vapor) that permeates the film when held for 1 day in an environment where the temperature is 40 ° C. and the humidity is 90% RH was measured.

For condition 5, when the portion of the inner wrapping film 3a that covers the outer peripheral surface of the film portion 2 is viewed through, the mutual relationship in the MD direction between the optical film and the inner wrapping film 3a is the film portion 2 The MD direction (longitudinal direction) of the optical film on the outer peripheral surface and the MD direction (longitudinal direction) of the inner packaging film 3a were set to be orthogonal to each other and parallel to each other. Specifically, the mutual relationship in the MD direction is orthogonal in Examples 1 to 8, 11, 14, and 16, and parallel in Examples 9, 10, 12, 13, 15, 17, and 18. It was said.

Regarding condition 6, in Examples 1 to 9, 12, 17, and 18, the touch roll was not used during winding, and in Examples 10, 11, and 13 to 16, the touch roll was used during winding.

Regarding Condition 7, in Examples 1 to 9, 12, 17, and 18, no touch roll was used during winding, and the hardness on the outer peripheral surface of the film portion 2 was 80. On the other hand, due to the use of the touch roll at the time of winding, the hardness on the outer peripheral surface of the film part 2 is 95 in Examples 10 and 11, 96 in Examples 13 and 14, and 98 in Examples 15 and 16. It was. The hardness of the outer peripheral surface of the film part 2 was measured by a durometer (GS-719R) manufactured by Teclock Corporation that satisfies the measurement method defined by K6253 of the Japanese Industrial Standard (JIS). Specifically, the durometer measured the hardness in the direction perpendicular to the outer peripheral surface of the film portion 2.

<(B) Comparative Example 1>
As Comparative Example 1, Example 9 was used as a base, and the inner packaging film 3a and the outer packaging film 3b were both replaced with a set of two packaging films. Specifically, in Comparative Example 1, the inner packaging film 3a is formed as having a joint by overlapping one end of the two packaging films in the width direction by about 100 mm, and the joint is formed. Is arranged along the circumferential direction of the film roll 10. As the outer packaging film 3b, one having the same form as the inner packaging film 3a was employed. The joint was stopped with an adhesive tape (specifically, a transparent packaging tape manufactured by Sumitomo 3M).

<(C) Comparative Example 2>
As Comparative Example 2, Example 9 was used as a base, and the inner packaging film 3a had a moisture permeability of 1.5 g / m ² · 24h.

<(D) Counting number of sticking in Examples 1 to 18 and Comparative Examples 1 and 2>
For the film roll packaging bodies of Examples 1 to 18 and Comparative Examples 1 and 2 manufactured as described above, the sticking between the optical films and the sticking between the optical film and the inner packaging film 3a The number of sticking (also called the number of sticking) was counted.

Here, after each film roll package of Examples 1 to 18 and Comparative Examples 1 and 2 is stored for 1 week in an environment where the temperature is 40 ° C. and the humidity is 90%, the package film is transferred from each film roll package. Was removed, and the optical film pulled out from the film portion of each film roll was visually observed, whereby the number of sticking was counted.

Specifically, the outermost optical film region of the film portion (also referred to as the outermost film region) and the optical film portion for one turn in the place drawn 500 m from the outermost periphery of the film portion (also referred to as the inner film region). Were cut out and subjected to visual observation according to the number of sticking. And about each Example and each comparative example, the sum of the number of sticking in an outermost periphery film area | region and the number of sticking in an internal film area | region was made into the number of sticking. In addition, in visual observation, it was utilized that the place where sticking of optical films and the sticking of an optical film and a packaging film had arisen among optical films was visually recognized in black.

<(E) Measurement of elastic modulus of optical film and packaging film>
About the measurement of the TD elastic modulus and MD elastic modulus of the optical film in each film roll, the outermost peripheral film region which was the object of visual observation of the number of sticking was pulled according to Japanese Industrial Standards (JIS) K6734 (2000 revision). A test dumbbell was created. And about this tensile test dumbbell, the tensile test according to K7161 (1994 revision) of Japanese Industrial Standard (JIS) was done, and TD elasticity modulus and MD elasticity modulus were calculated | required. In all of Examples 1 to 18, the value obtained by dividing the TD elastic modulus by the MD elastic modulus was 1.25.

Also, the TD elastic modulus and MD elastic modulus of the inner packaging film were determined by the same method as the method for measuring the TD elastic modulus and MD elastic modulus of the optical film. And about any inner packaging film, the value which remove | divided TD elasticity modulus by MD elasticity modulus was 1.5.

<Results for (F) number of sticking>
As shown in Table 1 above, in any of Examples 1 to 18, the number of attachments was 12 or less. On the other hand, in Comparative Example 1, the number of sticking is 19, and the number of sticking is clearly increased as compared with the number of sticking in Example 9 (7) which differs only in the presence or absence of the seam. did. It was speculated that such an increase in the number of sticking occurred due to a decrease in moisture resistance due to the presence of the seam of the packaging film. Thereby, the outer peripheral surface and both side surfaces of the film portion in the so-called wide film roll whose width of the optical film is 1800 mm or more and 4000 mm or less are covered with one wrapping film, so that the optical films are attached to each other. It was also found that sticking between the optical film and the packaging film was suppressed.

In Examples 9, 17, and 18 in which the outer diameter of the core is the same, and only the outer diameter of the core is changed, the outer diameter of the core is 250 mm or more. Decreased significantly. It was estimated that such a decrease in the number of sticking was the result of the tightness of the core that made it difficult for the film portion to buckle and the sticking between the optical films being suppressed.

In addition, the conditions other than the moisture permeability of the inner packaging film were the same, and for Examples 9 and 12 and Comparative Example 2 in which only the moisture permeability of the inner packaging film was changed, as the moisture permeability increased, Increased to 7, 12, and 26. Such an increase in the number of sticking was presumed to be caused by a decrease in moisture resistance due to an increase in moisture permeability of the inner packaging film. And it turned out that it is effective for suppression of sticking that the moisture permeability of the inner side packaging film 3a shall be 1.0 g / m < ² > * 24h or less from this result.

Further, in Examples 2 and 9 in which the conditions other than the mutual relation in the MD direction are the same and only the mutual relation in the MD direction is changed, the pasting is performed when the mutual relation in the MD direction is changed from parallel to orthogonal. The number attached is reduced from 7 to 2. It was estimated that such a reduction in the number of sticking was caused by suppression of sticking between the packaging film and the optical film. From this result, if the mutual relationship in the MD direction is orthogonal, the direction in which the inner wrapping film has the curl and the circumferential direction of the film part of the film roll are parallel when viewed through the plane. In other words, it was found to be effective in suppressing sticking between the optical film and the packaging film.

Further, for the series of Examples 9, 10, 13, and 15 in which the conditions other than the hardness on the outer peripheral surface of the film part 2 are the same and only the hardness is changed, the hardness is 80, 95, and 96. , 98, the number of sticking became 7, 4, 2, 3. In addition, with respect to other series of Examples 2, 11, 14, and 16 in which conditions other than the hardness are the same and only the hardness is changed, the hardness increases to 80, 95, 96, and 98. Then, the number of sticking became 2, 0, 0, 2.

For this reason, it was found that when the hardness of the outer peripheral surface of the film portion 2 is in the range of 95 to 96, the sticking between the optical films and the sticking between the optical film and the packaging film are further suppressed. It was speculated that such sticking suppression could occur due to the suppression of the shape loss of the film portion. Moreover, when the hardness in the outer peripheral surface of the film part 2 was too high, it turned out that the effect on which sticking is suppressed on the contrary becomes thin.

DESCRIPTION OF SYMBOLS 1 Core 2 Film part 3 Packaging film 3a Inner packaging film 3b Outer packaging film 10 Film roll 30 Packaging film roll 100 Film roll packaging body

Claims

A film roll in which the film is wound into a roll around the core;
One film-like body covering the outer peripheral surface and both end surfaces of the entire film in the film roll,
With
The width in the short direction of the film is 1800 mm or more and 4000 mm or less,
The longitudinal direction of the film is a direction along the circumferential direction of the core,
A film roll package having a moisture permeability of 1 g / m 2 · 24 h or less in the one film-like body.
The one sheet-like body has a curl in the longitudinal direction,
When a portion covering the outer peripheral surface of the one film-like body is seen through a plane, the circumferential direction of the outer peripheral surface and the longitudinal direction of the one film-like body are orthogonal to each other. The package body of the film roll of Claim 1.
In the film, the elastic modulus in the short direction is larger than the elastic modulus in the longitudinal direction,
In the one film-like body, the elastic modulus in the short direction is larger than the elastic modulus in the longitudinal direction,
When the part covering the outer peripheral surface of the one film-like body is seen through a plane, the longitudinal direction of the film on the outer peripheral surface is orthogonal to the longitudinal direction of the one film-like body. The package of the film roll of Claim 2.
The film roll package according to any one of claims 1 to 3, wherein the one film-like body is formed by welding two or more film-like bodies.
The maximum value of the outer diameter of the film roll is 400 mm or more and 1000 mm or less, The film roll packaging body according to any one of claims 1 to 4.
The film roll package according to any one of claims 1 to 5, wherein the content of the solvent in the film in the film roll is 0.1% or less.
The winding core is configured using a fiber reinforced plastic,
The package body of the film roll of any one of Claims 1-6 whose outer diameter of the said core is 250 mm or more.
The film roll package according to any one of claims 1 to 7, wherein the hardness of the outer peripheral portion of the film roll defined by measurement with a durometer is 80 or more and 98 or less.
A film roll in which the film is wound into a roll around the core;
A film-like body covering the outer peripheral surface and the end of the film part in the film roll;
With
The film-like body has a curl in one direction;
The film roll packaging body in which a circumferential direction of the outer peripheral surface and one direction of the film-shaped body are orthogonal to each other when a portion of the film-like body covering the outer peripheral surface is seen through a plane.
In the film, the elastic modulus in the short direction is larger than the elastic modulus in the longitudinal direction,
In the film-like body, the elastic modulus in the one direction is smaller than the elastic modulus in the other direction orthogonal to the one direction,
The longitudinal direction of the film on the outer peripheral surface and the one direction of the film-shaped body are orthogonal to each other when a portion of the film-like body covering the outer peripheral surface is seen through a plane. 10. A film roll package according to 9.
(a) preparing a film roll in which a film whose elastic modulus in the short direction is larger than the elastic modulus in the longitudinal direction is wound in a roll shape around the core;
(b) When the film-like body has a curl in one direction and the film-like body is seen through a plane, the circumferential direction on the outer peripheral surface of the film portion of the film roll and one direction of the film-like body are Covering the outer peripheral surface and the end surface of the film part so as to be orthogonal;
The manufacturing method of the package body of a film roll provided with.
(c) a step of preparing a packaging film roll in which a packaging film is wound in a roll shape around a core;
(d) a step of obtaining the film-like body used in the step (b) by pulling and cutting a part of the packaging film from the packaging film roll;
With
The manufacturing method of the package body of the film roll of Claim 11 with which the longitudinal direction of the film for the packaging in the said packaging film roll and one direction of the said film-like body cut out from the said packaging film roll correspond.