JP2015231699A - Resin film roll, and method for producing resin film roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain the characteristics of a resin film by eliminating swell marks appeared therein.SOLUTION: In the method for producing a resin film roll 1 where a resin film 2 and intermediate paper 3 are abutted so as to be slid and are integrally carried, and the resin film 2 and the intermediate paper 3 are wound into a roll shape to produce the resin film roll 1 in which the resin film 2 and the intermediate paper 3 are mutually laminated, the surface roughness of the intermediate paper 3 is higher than the surface roughness of the resin film 2.

Description

  The present invention relates to a resin film roll in which a resin film is wound in a roll shape, and a method for producing the resin film roll, and particularly when waviness marks are generated, the waviness is caused by winding in a roll shape through a slip sheet. The present invention relates to a resin film roll that eliminates traces and a method for producing the same.

  Various film products such as an optical film and a packaging film are often wound into a roll after manufacturing the film, and in-store storage or shipment is often performed as a film roll. In the process of winding the film in a roll shape, when air is mixed into the laminated film interface, the air layer intervenes and the film is laminated and pressed in a mixed state. . For this reason, the film retains its shape according to the boundary between the aeration area and the film adhesion area, and appears as waviness marks on the appearance, causing the quality of the optical film to deteriorate.

  As a measure for preventing the occurrence of such waviness marks, for example, when a film is wound up by providing a concavo-convex portion at the widthwise end of the film or by inserting a side tape at the widthwise end of the substrate. A method for preventing contact between films adjacent to each other, or a method for preventing adhesion of the film interface by imparting an uneven shape to the film surface by adding a filler to the resin or the like is known.

JP 2000-272003 A JP 2002-18944 A JP 2009-86426 A

  In the method of providing the uneven portion at the end portion in the width direction of the film described above, a step of forming the uneven portion before winding the film is required, which causes an increase in manufacturing man-hours and manufacturing equipment, There is a possibility that the film is cracked or cut from the uneven portion due to bending or the like occurring during processing.

  In addition, when the film layer is lifted only by the end in the width direction of the film by forming an uneven part or inserting a side tape, only the end in the width direction of the film is in contact when wound in a roll shape. However, in the case of a thin film having a low rigidity such as a thickness of less than 100 μm, the tension at the center cannot be maintained, and when wound in a long length, the films come into contact with each other near the center, and the TD direction Unevenness and deformation occur.

  Furthermore, in the method of imparting a concavo-convex shape to the film surface by adding a filler to the resin or the like, the concavo-convex processing is performed on the film surface, thereby causing a decrease in optical characteristics.

  Then, this invention aims at providing the manufacturing method of a resin film roll and the resin film roll which can eliminate the waviness trace which appeared in the resin film, and can maintain the characteristic of a film, a resin film, and its manufacturing method. .

  In order to solve the above-described problems, a resin film roll according to the present invention slidably attaches a resin film and a slip sheet and conveys them integrally, and winds the resin film and the slip sheet into a roll. In the method for producing a resin film roll in which the resin film and the interleaf are alternately laminated, the surface roughness of the interleaf is rougher than the surface roughness of the resin film.

  Further, the method for producing a resin film roll according to the present invention includes a resin film roll in which a resin film and an interleaf are alternately wound, and the surface roughness (Ra1) of the resin film and the surface roughness of the interleaf. Sa (Ra2) satisfies the relationship of Ra2 / Ra1 = 6-40.

  Further, the method for producing a resin film according to the present invention is a method in which a resin film and an interleaf are attached and conveyed together, the resin film and the interleaf are wound into a roll, and the resin film and the interleaf are In the method for producing a resin film, in which the resin film roll is stored for a predetermined time, the surface roughness of the slip sheet is rougher than the surface roughness of the resin film.

  Moreover, the resin film which concerns on this invention is manufactured by the method mentioned above.

  According to the present invention, after the interleaving paper and the resin film are put together and conveyed integrally, the roll is wound into a roll shape, and when the resin film roll is formed, the resin film and the interleaving paper are laminated. And pressed by tension due to tightening. Accordingly, the resin film can eliminate the waviness trace by being integrally conveyed with the interleaf and being wound into a roll integrally with the interleaf.

FIG. 1 is a side view showing a manufacturing process of a resin film roll to which the present invention is applied. FIG. 2 is a cross-sectional perspective view showing an outline of the cyclic olefin-based resin composition film according to the present embodiment. FIG. 3 is a schematic diagram illustrating a configuration example of a film manufacturing apparatus. FIG. 4A is a diagram showing reflected light when the visible light is applied to the resin film from which the waviness trace has disappeared, and FIG. 4B is a view when the visible light is applied to the resin film having the remaining waviness trace. It is a figure which shows reflected light.

  Hereinafter, a resin film roll to which the present invention is applied, a resin film roll manufacturing method, a resin film and a manufacturing method thereof will be described in detail with reference to the drawings. It should be noted that the present invention is not limited to the following embodiments, and various modifications can be made without departing from the scope of the present invention. Further, the drawings are schematic, and the ratio of each dimension may be different from the actual one. Specific dimensions should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

  As shown in FIG. 1, the resin film roll 1 to which the present invention is applied is a wound body in which a resin film 2 and an interleaf paper 2 are alternately laminated by being integrally wound. The resin film roll 1 is slidably attached to the resin film 2 and the interleaf paper 3 and transported integrally, and then the resin film 2 and the interleaf paper 3 are integrally wound in a roll shape. Manufactured by turning.

  Even when the undulation trace is formed on the resin film 2, the undulation trace is smoothed by sliding the intermediate paper 3 while it is attached to the intermediate paper 3 and conveyed integrally. From this state, the resin film 2 is further rolled integrally with the slip sheet 3 so as to be laminated with the slip sheet 3 and pressed by tension by tightening. Thereby, the resin film 2 can eliminate undulation traces.

[Resin film]
Here, examples of the resin film 2 include various films used for optical films and packaging films. Here, as the resin film 2, a cyclic olefin resin composition film in which an elastomer or the like is added and dispersed in a cyclic olefin resin is illustrated. Cyclic olefin resin is an amorphous and thermoplastic olefin resin that has a cyclic olefin skeleton in its main chain, has excellent optical properties (transparency, low birefringence), low water absorption, It has excellent performance such as dimensional stability and high moisture resistance. Therefore, a film or sheet made of a cyclic olefin resin can be used for various optical applications, for example, a retardation film, a polarizing plate protective film, a light diffusion plate, etc., particularly a prism sheet, a liquid crystal cell substrate, and a moisture-proof packaging. Applications to applications such as pharmaceutical packaging and food packaging are also expected.

  In addition, as shown in FIG. 2, the cyclic olefin-based resin film 2 is obtained by adding and dispersing a styrene-based elastomer 12 having a hard segment and a soft segment at a predetermined ratio in the cyclic olefin-based resin 11 to obtain optical characteristics ( It has excellent retardation and haze) and sufficient toughness.

[Cyclic olefin resin]
The cyclic olefin-based resin 11 is a polymer compound having a main chain composed of carbon-carbon bonds and having a cyclic hydrocarbon structure in at least a part of the main chain. This cyclic hydrocarbon structure is introduced by using a compound (cyclic olefin) having at least one olefinic double bond in the cyclic hydrocarbon structure as represented by norbornene or tetracyclododecene as a monomer. Is done.

  Cyclic olefin resins include cyclic olefin addition (co) polymers or hydrogenated products thereof (1), cyclic olefin and α-olefin addition copolymers or hydrogenated products thereof (2), cyclic olefin ring-opening ( Co) polymers or hydrogenated products thereof (3).

  Specific examples of the cyclic olefin include: cyclopentene, cyclohexene, cyclooctene; one-ring cyclic olefin such as cyclopentadiene, 1,3-cyclohexadiene; bicyclo [2.2.1] hept-2-ene (common name: norbornene) ), 5-methyl-bicyclo [2.2.1] hept-2-ene, 5,5-dimethyl-bicyclo [2.2.1] hept-2-ene, 5-ethyl-bicyclo [2.2. 1] Hept-2-ene, 5-butyl-bicyclo [2.2.1] hept-2-ene, 5-ethylidene-bicyclo [2.2.1] hept-2-ene, 5-hexyl-bicyclo [ 2.2.1] hept-2-ene, 5-octyl-bicyclo [2.2.1] hept-2-ene, 5-octadecyl-bicyclo [2.2.1] hept-2-ene, 5- Methylidene Bicyclo [2.2.1] hept-2-ene, 5-vinyl-bicyclo [2.2.1] hept-2-ene, 5-propenyl-bicyclo [2.2.1] hept-2-ene, etc. A bicyclic olefin of

  Tricyclo [4.3.0.12,5] deca-3,7-diene (common name: dicyclopentadiene), tricyclo [4.3.0.12,5] dec-3-ene; tricyclo [4. 4.0.12,5] undeca-3,7-diene or tricyclo [4.4.0.12,5] undeca-3,8-diene or partial hydrogenates thereof (or addition of cyclopentadiene and cyclohexene) Tricyclo [4.4.0.12,5] undec-3-ene; 5-cyclopentyl-bicyclo [2.2.1] hept-2-ene, 5-cyclohexyl-bicyclo [2.2. 1] a tricyclic olefin such as hepta-2-ene, 5-cyclohexenylbicyclo [2.2.1] hept-2-ene, 5-phenyl-bicyclo [2.2.1] hept-2-ene;

  Tetracyclo [4.4.0.12,5.17,10] dodec-3-ene (also simply referred to as tetracyclododecene), 8-methyltetracyclo [4.4.0.12,5.17,10 ] Dodec-3-ene, 8-ethyltetracyclo [4.4.0.12, 5.17,10] dodec-3-ene, 8-methylidenetetracyclo [4.4.0.12,5. 17,10] dodec-3-ene, 8-ethylidenetetracyclo [4.4.0.12,5.17,10] dodec-3-ene, 8-vinyltetracyclo [4.4.0.12, 4.17,10] dodec-3-ene, 4-cyclic olefins such as 8-propenyl-tetracyclo [4.4.0.12, 5.17,10] dodec-3-ene;

  8-cyclopentyl-tetracyclo [4.4.0.12,5.17,10] dodec-3-ene, 8-cyclohexyl-tetracyclo [4.4.0.12,5.17,10] dodec-3-. Ene, 8-cyclohexenyl-tetracyclo [4.4.0.12,5.17,10] dodec-3-ene, 8-phenyl-cyclopentyl-tetracyclo [4.4.0.12,5.17,10 Dodeca-3-ene; tetracyclo [7.4.13, 6.01, 9.02, 7] tetradeca-4,9,11,13-tetraene (1,4-methano-1,4,4a, 9a -Tetrahydrofluorene), tetracyclo [8.4.14,7.01,0.03,8] pentadeca-5,10,12,14-tetraene (1,4-methano-1,4,4a, 5 , 10, 10 -Also referred to as -hexahydroanthracene); pentacyclo [6.6.1.13,6.02,7.09,14] -4-hexadecene, pentacyclo [6.5.1.13,6.02,7. 09,13] -4-pentadecene, pentacyclo [7.4.0.02,7.13,6.110,13] -4-pentadecene; heptacyclo [8.7.0.12,9.14,7. 111, 17.03, 8.012, 16] -5-eicosene, heptacyclo [8.7.0.12, 9.03, 8.14, 7.012, 17.113, l6] -14-eicosene; And polycyclic cyclic olefins such as cyclopentadiene tetramer. These cyclic olefins can be used alone or in combination of two or more.

  Specific examples of the α-olefin copolymerizable with the cyclic olefin include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-butene, 3-methyl-1-pentene, 3 -Ethyl-1-pentene, 4-methyl-1-pentene, 4-methyl-1-hexene, 4,4-dimethyl-1-hexene, 4,4-dimethyl-1-pentene, 4-ethyl-1- 2-20 carbon atoms such as hexene, 3-ethyl-1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicocene, preferably carbon number Examples include 2 to 8 ethylene or α-olefin. These α-olefins can be used alone or in combination of two or more. As these α-olefins, those contained in the range of 5 to 200% with respect to the cyclic polyolefin can be used.

  There are no particular limitations on the polymerization method of the cyclic olefin or the cyclic olefin and the α-olefin and the hydrogenation method of the obtained polymer, and it can be carried out according to a known method.

  As the cyclic olefin-based resin 11, an addition copolymer of ethylene and norbornene is preferably used in the present embodiment.

  There is no restriction | limiting in particular in the structure of the cyclic olefin resin 11, Although it may be chain | strand shape, branched shape, or bridge | crosslinking shape, Preferably it is linear.

  The molecular weight of the cyclic olefin-based resin 11 is 5,000 to 300,000, preferably 10,000 to 150,000, and more preferably 15,000 to 100,000 according to the GPC method. If the number average molecular weight is too low, the mechanical strength decreases, and if it is too high, the moldability deteriorates.

  Further, the cyclic olefin resin 11 includes polar groups (for example, a carboxyl group, an acid anhydride group, an epoxy group, an amide group, an ester group, a hydroxyl group, etc.) in the above-mentioned cyclic olefin resins (l) to (3). Grafted and / or copolymerized (4) of an unsaturated compound (u) having Two or more of the cyclic olefin resins (l) to (4) may be used in combination.

  Examples of the unsaturated compound (u) include (meth) acrylic acid, maleic acid, maleic anhydride, itaconic anhydride, glycidyl (meth) acrylate, alkyl (meth) acrylate (carbon number 1 to 10) ester, maleic acid Alkyl (C1-C10) ester, (meth) acrylamide, (meth) acrylic acid-2-hydroxyethyl, etc. are mentioned.

  Affinity with metals and polar resins can be increased by using a modified cyclic olefin resin (4) obtained by grafting and / or copolymerizing an unsaturated compound (u) having a polar group, so vapor deposition, sputtering, coating It is possible to increase the strength of various secondary processing such as adhesion, and is suitable when secondary processing is required. However, the presence of the polar group has a drawback of increasing the water absorption rate of the cyclic olefin resin. Therefore, the content of polar groups (for example, carboxyl group, acid anhydride group, epoxy group, amide group, ester group, hydroxyl group, etc.) is preferably 0 to 1 mol / kg per kg of cyclic olefin resin.

[Styrene elastomer]
The styrene elastomer 12 has a storage elastic modulus at 0 ° C. to 100 ° C. of less than 100 MPa. That is, the maximum value of the storage elastic modulus at 0 ° C. to 100 ° C. of the styrene elastomer 12 is less than 100 MPa. A more preferred storage elastic modulus is 20 MPa or less. When the storage elastic modulus at 0 ° C. to 100 ° C. is large, the in-plane retardation of the film becomes large.

  Two types of factors are involved in polymer birefringence. The first is orientation refraction that occurs when molecular chains are highly oriented. Orientation refraction is determined by the degree of orientation and the intrinsic value of the polymer main chain. The second is birefringence due to stress. When force is applied from the outside, the birefringence changes due to the distortion.

  The styrenic elastomer 12 has a low-energy-contracted yarn-like shape when no external force is applied, but when an external force such as elongation or shear is applied, the molecular chain is thereby stretched and oriented in one direction. become. The optical properties (refractive index) are different between the main chain and the direction crossing the main chain, and a product in which molecular chains are highly oriented exhibits a so-called birefringence phenomenon.

  In this embodiment, since the storage elastic modulus of the styrene elastomer 12 at 0 ° C. to 100 ° C. is less than 100 MPa, the fluidity at the time of melting is high, the residual stress can be reduced, and the orientation of the molecular chain It is possible to keep the degree small. In addition, it is considered that the intrinsic refractive index can be reduced by including the negative refractive index of the styrene portion and the positive refractive index of the ethylene portion.

  The molecular weight of the styrene-based elastomer 12 is 5,000 to 300,000, preferably 10,000 to 150,000, and more preferably 20,000 to 100,000 according to the GPC method. If the number average molecular weight is too low, the mechanical strength decreases, and if it is too high, the moldability deteriorates.

  The styrene elastomer 12 is a copolymer of styrene and a conjugated diene such as butadiene or isoprene, and / or a hydrogenated product thereof. The styrene elastomer 12 is a block copolymer in which styrene is a hard segment and conjugated diene is a soft segment. The structure of the soft segment changes the storage elastic modulus of the styrene-based elastomer 12, and the content of styrene, which is the hard segment, changes the refractive index and changes the haze of the entire film. The styrene elastomer 12 does not require a vulcanization step and is preferably used. Further, the hydrogenated one is more preferable because it has higher thermal stability.

  Examples of the styrene elastomer 12 include styrene / butadiene / styrene block copolymers, styrene / isoprene / styrene block copolymers, styrene / ethylene / butylene / styrene block copolymers, and styrene / ethylene / propylene / styrene block copolymers. Examples thereof include a polymer and a styrene / butadiene block copolymer.

  In addition, styrene / ethylene / butylene / styrene block copolymer, styrene / ethylene / propylene / styrene block copolymer, styrene / butadiene block copolymer (hydrogenation) in which double bond of conjugated diene component is eliminated by hydrogenation May also be used.

  The structure of the styrenic elastomer 12 is not particularly limited, and may be chain-like, branched or cross-linked, but is preferably linear in order to reduce the storage elastic modulus.

  In the present embodiment, at least one styrene selected from the group consisting of styrene / ethylene / butylene / styrene block copolymers, styrene / ethylene / propylene / styrene block copolymers, and hydrogenated styrene / butadiene block copolymers. A system elastomer 12 is preferably used. In particular, hydrogenated styrene / butadiene block copolymers are more preferably used because of high tear strength and small haze increase after environmental preservation. The ratio of butadiene to styrene in the hydrogenated styrene / butadiene block copolymer is preferably in the range of 10 to 90% so as not to impair the compatibility with the cyclic olefin resin.

  Moreover, it is preferable that the styrene content rate of the styrene-type elastomer 12 is 20-40 mol%. By setting the styrene content to 20 to 40 mol%, the haze can be reduced.

  In addition to the cyclic olefin-based resin 11 and the styrene-based elastomer 12, various compounding agents may be added to the cyclic olefin-based resin composition as necessary as long as the characteristics thereof are not impaired. The various compounding agents are not particularly limited as long as they are usually used in thermoplastic resin materials. For example, antioxidants, ultraviolet absorbers, light stabilizers, plasticizers, lubricants, antistatic agents, difficulty Examples include flame retardants, colorants such as dyes and pigments, near infrared absorbers, compounding agents such as fluorescent brighteners, and fillers.

  According to the cyclic olefin-based resin film 2 having such a configuration, the tear strength can be 60 N / mm or more, preferably 100 N / mm or more, and more preferably 120 N / mm or more. Further, the haze can be 15% or less, preferably 2% or less. If the tear strength is too smaller than the above range, the film is liable to break during production or use, which is inappropriate. On the other hand, if the haze is too high, it deviates from the initial characteristics in use and does not satisfy the intended characteristics.

[Method for Producing Cyclic Olefin Resin Film]
In the method for producing the cyclic olefin resin film 2 according to the present embodiment, the cyclic olefin resin 11 and the styrene elastomer 12 having a storage elastic modulus of less than 100 MPa at 0 ° C. to 100 ° C. are melted. The obtained cyclic olefin resin composition is extruded into a film by an extrusion method to obtain a cyclic olefin resin film 2 in which the styrene elastomer 12 is dispersed in the cyclic olefin resin 11. The cyclic olefin resin film 2 may be non-stretched, uniaxially stretched, or biaxially stretched.

  FIG. 3 is a schematic diagram illustrating a configuration example of a film manufacturing apparatus. The film manufacturing apparatus includes a die 21 and a roll 22. The die 21 is a die for melt molding, and extrudes the molten resin material 23 into a film shape. The resin material 23 contains the above-mentioned cyclic olefin resin composition, for example. The roll 22 has a role of transporting the resin material 23 extruded from the die 21 into a film shape. Further, the roll 22 has a medium flow path therein, and the surface can be adjusted to an arbitrary temperature by an individual temperature control device. Moreover, the material of the surface of the roll 22 is not specifically limited, A metal rubber, resin, an elastomer, etc. can be used.

  In the present embodiment, as the resin material 23, the cyclic olefin resin composition containing the above-mentioned cyclic olefin resin 11 and the styrene elastomer 12 is used and melt-mixed at a temperature in the range of 210 ° C. to 300 ° C. . As the melting temperature is higher, the minor axis dispersion diameter tends to be smaller.

  The resin material 23 extruded into a film shape is conveyed by a roll 22 and then wound into a roll shape to form an original fabric roll 24 of the resin film 2. At this time, the resin film 2 is laminated and pressed in a state where a region where the air layer is interposed and a region where the films are in close contact with each other are mixed with air at the film interface. For this reason, the resin film 2 appears as a waviness mark on the appearance while maintaining the shape according to the boundary between the aeration region and the film adhesion region. Subsequently, the resin film 2 is unwound from the raw roll 24, and is integrally conveyed with the interleaf 3 and wound into a roll shape to produce the resin film roll 1 (see FIG. 1).

[Interleaf]
The interleaf 3 is a film having a predetermined surface roughness and flexibility, and is a material that does not hinder unwinding when wound as the resin film roll 1. For example, a PET film may be used. it can. The surface roughness of the interleaving paper 3 is rougher than the surface roughness of the resin film 2. And when the interleaf 3 is conveyed integrally with the resin film 2 through a plurality of guide rolls, it slides with the resin film 2 without being in close contact with the resin film 2 by entraining air, Thereby, the surface of the resin film 2 is leveled.

  In this state, the interleaf 3 is wound integrally with the resin film 2 in a roll shape, and when the resin film roll 1 is formed, the resin film 2 and the interleaf 3 are laminated and pressed by tension due to winding. Is done. As a result, the undulation trace generated during the production of the raw fabric roll 24 and the like is disappeared by the integral conveyance with the interleaf paper 3 and the roll roll integrally with the interleaf paper 3. . The resin film 2 is set in storage or shipped as a resin film roll 1 and is unwound from the resin film roll 1 when used.

  FIG. 4A shows the cyclic olefin-based resin film 2 unwound from the raw roll 24 and the PET film as the interleaving paper 3, transported integrally, wound into a roll, and then the resin 1 is a view showing a resin film unwound from a film roll 1. FIG. 4 (B) shows a resin film unwound from the resin film roll after winding only the cyclic olefin resin film 2 unwound from the raw roll 24 in a roll shape without interposing the interleaf 3. It is drawing which shows.

  4 (A) and 4 (B) are compared, the undulation trace disappears in the resin film shown in FIG. 4 (A) that is conveyed and wound integrally with the interleaf paper 3, and the reflected light is substantially uniform. It is reflected. On the other hand, in the resin film shown in FIG. 4B with no interleaving paper 3 interposed, it can be seen that the reflected light is disturbed by waviness marks and appears unevenly. In FIG. 4, for the sake of convenience, the presence or absence of waviness marks is shown due to the disturbance of the reflected light, but this is because the waviness marks themselves are not clearly shown in a photograph or the like. The waviness mark can be clearly seen visually.

[lead time]
Here, in the resin film roll 1, when the lead time until the formation process of the resin film roll 1 becomes longer after the formation of the raw film roll 24, waviness marks generated when the original film roll 24 is formed are formed on the surface of the resin film 2. It will be fixed. Therefore, the resin film roll 1 needs to be stored in a room temperature environment for a predetermined time or more according to the lead time from the formation of the raw fabric roll 24 to the formation process of the resin film roll 1.

  That is, when the slip sheet 3 is integrally wound with the resin film 2 in a roll shape, the resin film roll 1 is subjected to tension due to tightening, and therefore the resin film 2 sandwiched between the slip sheet 3. Can eliminate waviness traces that cannot be removed by the integral conveyance with the interleaving paper 3 due to the press effect.

  And if the lead time until the formation process of the resin film roll 1 becomes long, the waviness trace appearing at the time of forming the raw fabric roll 24 is fixed, and in order to eliminate this waviness trace, the resin film 2 is removed from the interleaf 3 It is necessary to press for a long time between. For this reason, it is preferable that the resin film roll 1 ensure storage time according to the lead time from the formation of the raw fabric roll 24 to the formation of the resin film roll 1.

[Surface roughness]
Further, the surface roughness (Ra) of the interleaving paper 3 is preferably 40 nm or less. When the surface roughness of the slip sheet 3 exceeds 40 nm, the waviness trace disappears, while the surface of the rough slip sheet 3 is transferred to the resin film 2 and the mottle pattern appears. The optical properties of the film will be impaired. In the present invention, patterns generated by winding with interleaving paper, such as uneven marks appearing on the surface of the resin film 2, and a yuzu skin pattern, are collectively referred to as a mottled pattern.

  Moreover, it is preferable that the surface roughness (Ra1) of the resin film 2 and the surface roughness (Ra2) of the interleaving paper 3 satisfy the relationship of Ra2 / Ra1 = 6 to 40, and more preferably, Ra2 / Ra1 = 10. ~ 40. When the surface roughness (Ra1) of the resin film 2 and the surface roughness (Ra2) of the interleaving paper 3 satisfy this relationship, the resin film 2 and the interleaving paper 3 can be slid and wound when integrally transported. The undulation trace of the resin film 2 can be effectively eliminated by the laminating press.

[Manufacturing method of other resin film roll]
In addition to forming the resin film roll 1 by integrally transporting and winding the resin film 2 and the interleaf 3 that are unwound from the original roll 24, without creating the original roll 24, You may manufacture by conveying and winding the resin film 2 integrally with the interleaving paper 3 after manufacture.

[High temperature storage]
Moreover, you may preserve | save the resin film roll 1 in an environment higher than normal temperature. As described above, the resin film roll 1 corrects the undulation marks with the pressure by tightening by securing the storage time according to the lead time from the formation of the raw fabric roll 24 to the formation of the resin film roll 1. . However, since the waviness mark is firmly fixed as the lead time becomes longer, even when the waviness mark can be reduced when stored in a room temperature environment, it may not disappear. Therefore, the resin film roll 1 can enhance the press effect on the resin film 2 and correct waviness marks by storing it in an environment higher than room temperature.

  Here, the storage temperature of the resin film roll 1 is preferably a temperature not higher than the glass transition temperature of the resin film. When stored in a temperature environment higher than the glass transition temperature, the surface of the rough interleaving paper 3 is transferred to the resin film 2 and a mottled pattern appears. In addition, when storing in an environment higher than room temperature, the surface of the slip-sheet 3 may be transferred and a mottled pattern may appear if the storage time is long even in a temperature environment below the glass transition temperature. Need to pay attention to storage time.

  Therefore, the resin film roll 1 is preferably stored in an environment at a temperature higher than room temperature by winding the interleaf 3 having a low surface roughness (Ra2) together with the resin film 2. As the slip sheet 3 having a low surface roughness (Ra), for example, a PET film (so-called mirror PET) having a surface roughness (Ra2) of 4 to 10 nm, preferably 4 to 5 nm, can be used.

  In addition, when the olefin-based resin composition film described above is used as the resin film 2, the surface roughness (Ra1) is 1 to 5 nm. When the mirror PET is used as the interleaf 3, the surface roughness ( Ra2) is 4 to 10 nm, preferably 4 to 5 nm, and the surface roughness (Ra2) of the slip sheet 3 is rougher than the surface roughness (Ra1) of the resin film 2.

  As described above, by using the highly smoothed slip sheet 3, the surface of the slip sheet 3 is not transferred even when the resin film roll 1 is stored in an environment higher than normal temperature. The waviness marks can be effectively eliminated while preventing the occurrence of mottled patterns.

[First embodiment]
Next, a first embodiment of the present invention will be described. In the first embodiment, after forming the raw roll 24 of the resin film 2, the lead time until the resin film 2 and the interleaf 3 are integrally conveyed and wound around the resin film roll 1, The storage time was changed, and the degree of disappearance of the waviness marks was visually evaluated.

  The resin film 2 is the above-mentioned cyclic olefin-based resin composition film, and is formed into two types having a thickness of 50 μm and a thickness of 100 μm by a melt extrusion manufacturing method, and a raw roll 24 is formed by winding each in a roll shape. . At this time, the shape of each resin film 2 was fixed in accordance with the boundary between the aeration region and the film adhesion region, and the boundary line appeared as waviness marks. Moreover, when the surface roughness (Ra1) of each resin film 2 was measured, it was the range of 1-3 nm.

  A PET film (Toyobo Co., Ltd .: ester film ES500) having a thickness of 12 μm and a surface roughness (Ra2) in the range of 30 to 40 nm was used as the interleaf 3 that is conveyed and wound integrally with the resin film 2. The ratio of the surface roughness (Ra1) of the resin film 2 to the surface roughness (Ra2) of the interleaving paper 3 is Ra2 / Ra1 = 10-40.

  The resin film 2 and the interleaf 3 that were unwound from the original fabric roll 24 were put together, conveyed together while being guided by a plurality of guide rolls, and wound up in a roll shape. The winding tension is 100 N for the resin film 2 having a thickness of 50 μm and 280 N for the resin film 2 having a thickness of 100 μm. The line speed is 100 m / min in all cases.

  After the formation of the raw roll 24 of the resin film 2, the lead time until the resin film 2 and the interleaf 3 are integrally conveyed and wound around the resin film roll 1 is 1 hour, 2 hours, 3 hours, 4 hours, The storage time of the resin film roll 1 was 0 hour, 24 hours, 48 hours, 72 hours, 96 hours, and 120 hours. Moreover, the resin film roll 1 was preserve | saved at normal temperature.

  After each storage time passed, the resin film 2 was unwound from the resin film roll 1 and the undulation trace was observed. As a result, the case where the waviness trace completely disappeared was marked as ◯, the case where the waviness trace was reduced by more than half, △, the case where the waviness trace was reduced by less than half, x, and the case where the waviness trace hardly disappeared as xx. . The results are shown in Table 1.

  As shown in Table 1, in the resin film roll 1 having a lead time of 4 hours or less, both of the two types of resin films 2 having a thickness of 50 μm and a thickness of 100 μm have a storage time of 24 to 72 hours in a normal temperature environment. We were able to correct the waviness marks. On the other hand, with the resin film roll 1 having a lead time of 15 hours or 48 hours, even when stored for 120 hours in a room temperature environment, the undulation marks were reduced.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In the second example, in the first example, the resin film roll 1 equivalent to the resin film sample in which the waviness traces are reduced is stored at 50 ° C. in a dry environment for a predetermined time, Whether or not the waviness marks could be corrected and the presence or absence of mottled patterns due to the transfer of the surface of the interleaving paper 3 were evaluated by visual observation.

  Also in the second example, two types of cyclic olefin-based resin composition films having a surface roughness (Ra1) of 1 to 3 nm, a thickness of 50 μm, and a thickness of 100 μm were used as the resin film 2. In Example 2, a specular PET film (Mitsubishi Resin Co., Ltd .: Diafoil R340G16) having a thickness of 16 μm and a surface roughness (Ra2) of 4 to 5 nm was used as the interleaf 3. In Example 2, the ratio of the surface roughness (Ra1) of the resin film 2 to the surface roughness (Ra2) of the interleaving paper 3 is Ra2 / Ra1 = 1.3-5.

  In Comparative Example 1, while using the same resin film 2 as Example 2, a PET film (Toyobo Co., Ltd .: ester film ES500) having a thickness of 12 μm and a surface roughness (Ra2) of 31 to 39 nm as the interleaf 3 is used. Using. In Comparative Example 1, the ratio between the surface roughness (Ra1) of the resin film 2 and the surface roughness (Ra2) of the interleaving paper 3 is Ra2 / Ra1 = 10-40.

  After forming the raw roll 24 of the resin film 2, the lead time until it was attached to the interleaf 3 and conveyed and wound integrally was 15 hours and 48 hours. The winding tension is 100 N for the resin film 2 having a thickness of 50 μm and 280 N for the resin film 2 having a thickness of 100 μm. The line speed is 100 m / min in all cases.

  In addition, after the formation of the resin film roll 1, the storage time in a dry environment at 50 ° C. was 0 hour, 24 hours, 48 hours, 72 hours, 96 hours, and 120 hours. After each storage time passed, the resin film 2 was unwound from the resin film roll 1, and whether or not the waviness marks could be corrected and the presence or absence of mottled patterns were visually observed. As a result, the case where the waviness trace completely disappeared was rated as “◯”, the case where the waviness trace was reduced as Δ, and the case where the waviness trace did not disappear as “x”. Similarly, a case where a mottled pattern did not occur was marked as ◯, and a case where a mottled pattern appeared was marked as x.

  Table 2 shows whether or not waviness marks can be corrected and occurrence of mottled patterns in each of the resin films 2 according to Example 2 and Comparative Example 1 at a lead time of 48 hours, 50 ° C., and a storage time of 48 hours or more in a dry environment. It is the evaluation result which observed the presence or absence of this visually.

  As shown in Table 2, in Example 2, waviness traces disappeared, and the mottled pattern on the surface of the interleaf 3 did not appear. On the other hand, in Comparative Example 1, the undulation trace could be eliminated, but a mottled pattern on the surface of the interleaf 3 appeared.

  Table 3 shows the relationship between the storage time of the resin film roll 1 according to Example 2 and whether or not the waviness mark can be corrected. As shown in Table 3, in the resin film roll 1 according to Example 2, when the lead time was 15 hours, the storage time was 24 hours or more, and the undulation marks could be eliminated. Moreover, the resin film roll 1 which concerns on Example 2 was able to lose | disappear the undulation trace by making storage time into 48 hours or more, even when lead time is 48 hours.

DESCRIPTION OF SYMBOLS 1 Resin film roll, 2 Resin film, 3 Interleaf, 11 Cyclic olefin resin, 12 Styrenic elastomer, 21 Die, 22 roll, 23 Resin material, 24 Original fabric roll

Claims (11)

A plastic film and a slip sheet are slidably attached to each other and conveyed together.
In the method for producing a resin film roll in which the resin film and the slip sheet are wound into a roll shape, and the resin film and the slip sheet are alternately laminated,
A method for producing a resin film roll, wherein the surface roughness of the slip sheet is greater than the surface roughness of the resin film. The method for producing a resin film roll according to claim 1, wherein the surface roughness (Ra1) of the resin film and the surface roughness (Ra2) of the slip sheet satisfy the following relationship.
Ra2 / Ra1 = 6-40 The resin film is wound into a roll after production,
The manufacturing method of the resin film roll of Claim 1 or 2 which is unwound from the original fabric roll of the said resin film, is attached to the said interleaf, and is conveyed integrally. After the resin film is wound in a roll shape, when a predetermined time or more has passed until it is wound with the slip sheet,
The method for producing a resin film roll according to claim 3, wherein the resin film and the slip sheet are wound in a roll shape and then stored in a high temperature environment for a predetermined time. The surface roughness (Ra1) of the resin film is 1 to 5 nm,
The method for producing a resin film roll according to claim 4, wherein the surface roughness (Ra2) of the interleaf is 4 to 5 nm.   The said resin film roll is a manufacturing method of the resin film roll of Claim 4 or 5 preserve | saved under temperature environment higher than normal temperature and below the glass transition temperature of the said resin film.   The said resin film is a manufacturing method of the resin film roll of any one of Claims 3-6 manufactured by the melt-extrusion manufacturing method. In the resin film roll in which the resin film and the interleaf are wound alternately,
The resin film roll satisfying the following relationship between the surface roughness (Ra1) of the resin film and the surface roughness (Ra2) of the slip sheet.
Ra2 / Ra1 = 6-40 A plastic film and a slip sheet are put together and transported together.
The resin film and the slip sheet are wound into a roll, and the resin film and the slip sheet are alternately laminated to form a resin film roll.
In the method for producing a resin film in which the resin film roll is stored for a predetermined time,
A method for producing a resin film, wherein the surface roughness of the slip sheet is greater than the surface roughness of the resin film. After the resin film is wound in a roll shape, when a predetermined time or more has passed until it is wound with the slip sheet,
The method for producing a resin film according to claim 9, wherein the resin film and the slip sheet are wound in a roll shape and then stored in a high temperature environment for a predetermined time.   A resin film produced by the method according to claim 9.