CN105980279B - The carrying method of film and the manufacturing method of optical film - Google Patents

The carrying method of film and the manufacturing method of optical film Download PDF

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Publication number
CN105980279B
CN105980279B CN201580007278.4A CN201580007278A CN105980279B CN 105980279 B CN105980279 B CN 105980279B CN 201580007278 A CN201580007278 A CN 201580007278A CN 105980279 B CN105980279 B CN 105980279B
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China
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film
optical film
layer
optical
resin
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CN105980279A (en
Inventor
名田敬之
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Dongwoo Fine Chem Co Ltd
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Dongwoo Fine Chem Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00—Advancing webs
    • B65H20/12—Advancing webs by suction roller
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/44—Moving, forwarding, guiding material
    • B65H2301/443—Moving, forwarding, guiding material by acting on surface of handled material
    • B65H2301/4432—Moving, forwarding, guiding material by acting on surface of handled material by means having an operating surface contacting only one face of the material, e.g. roller
    • B65H2301/44324—Rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/44—Moving, forwarding, guiding material
    • B65H2301/443—Moving, forwarding, guiding material by acting on surface of handled material
    • B65H2301/4433—Moving, forwarding, guiding material by acting on surface of handled material by means holding the material
    • B65H2301/44336—Moving, forwarding, guiding material by acting on surface of handled material by means holding the material using suction forces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
    • B65H2515/84—Quality; Condition, e.g. degree of wear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/61—Display device manufacture, e.g. liquid crystal displays

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  • Polarising Elements (AREA)
  • Replacement Of Web Rolls (AREA)
  • Advancing Webs (AREA)
  • Laminated Bodies (AREA)

Abstract

The present invention provides a kind of carrying method, it is the method for continuously conveying the connection film comprising the 1st film (10) and the 2nd film (20) linked with its length direction terminal by the more than one driven roller along the transport path comprising more than one driven roller (40), wherein, in the 1st film and the 2nd film at least any one be less than 200kJ/m for charpy impact strength2Optical film, all sucking rollers of driven roller more than said one.

Description

The carrying method of film and the manufacturing method of optical film
Technical field
The present invention relates to the carrying methods of film, more specifically, are related to link comprising the smaller optical film of toughness The method that the connection film that multiple films form continuously is conveyed along transport path by driven roller.In addition, the present invention also relates to And the manufacturing method of the optical film of the carrying method is used.
Background technology
It continuously feeds film and continuously carries out film while contact by defined transport path with multiple rollers defeated The method sent is universal as film carrying method, and the film for being wound into roll from roller is extracted out and is carried out in above-mentioned conveying The rewinding of film or stretching also become conventional method with being bonded etc. for other films etc. in the manufacture of various optical films.
In the various rollers used in above-mentioned conveying operation, there are the only free roll of the side of support membrane or configuration in film Both sides and niproll from two-side supporting film etc., but wherein, niproll is the tension adjustment to film, the drive for film conveying It is dynamic ,/one of the roller for preventing larger impact of gauffer/unevenness is mixed into the pressing of film, bubble.
For example, in Japanese Unexamined Patent Publication 2005-035147 bulletins (patent document 1), disclose the resin of melting extrusion The method for being pressed with niproll and film being made.In addition, in Japanese Unexamined Patent Publication 11-048271 bulletins (patent document 2), The unevenness of mesh (film) generated in drying in stenter in order to prevent, and then, in Japanese Unexamined Patent Publication 2006-339287 In bulletin (patent document 3), in order to enter the deaeration of the gas in component when film is bonded, disclose using niproll as from Apply stressed means in mesh (film) two sides.
In addition, in the continuity carrying method of above-mentioned film, generally target film is made to initially pass through defined transport road During diameter, link lead film in advance at the film beginning, first, which is continuously conveyed by transport path, then Convey target film.In addition, when temporarily ceasing conveying operation in the case of rerunning similarly below, generally with The state that the terminal of film links leaded film stops, when rerunning, by the way that the beginning of target film is attached to the lead film Terminal, so as to start the conveying of target film.And then the spreading of the film of identical type is also carried out sometimes, to different types of film Switching etc., the mutual connection of film for continuously transport membrane.Like this, in the mutual continuous conveying process for being attached at film of film Often it is used.
As by film method connected to each other, have disclosed in Japanese Unexamined Patent Publication 2010-008509 bulletins (patent document 4) Such connection using heat-sealing, the method etc. for linking film each other by band.In addition, in Japanese Unexamined Patent Publication 08-208083 In number bulletin (patent document 5), disclose multiple former material rollers through turntable and the method for splicing.
Existing technical literature
Patent document
Patent document 1：Japanese Unexamined Patent Publication 2005-035147 bulletins
Patent document 2：Japanese Unexamined Patent Publication 11-048271 bulletins
Patent document 3：Japanese Unexamined Patent Publication 2006-339287 bulletins
Patent document 4：Japanese Unexamined Patent Publication 2010-008509 bulletins
Patent document 5：Japanese Unexamined Patent Publication 08-208083 bulletins
Invention content
Problems to be solved by the invention
In recent years, power consumption it is small, with low voltage operating, lightweight and slim image display device (such as liquid crystal display device) It is widely used in the device for display of message such as mobile phone, portable information terminal, the monitor of computer, TV.It is such Device for display of message is required further to be thinned according to purposes, and film is also required for the various optical films for forming it Change.
About the material of the optical film used, various design alterations are proposed also for performance is improved, if such as enumerating Go out for the polarizer used in liquid crystal display device, then as the protective film fitted on polarizing coating, three are widely used in the past Acetylcellulose film, still, in recent years, from the viewpoint of the transparency and heat resistance, thin-walled glass or acrylic acid series, drop ice The resin films such as piece alkene system are also gradually used.
However, due to the filming of optical film, diversification, for the optical film of poor toughness, cause to generate in in-process The problems such as rupturing in processes.For example, when film is connected to each other, due to no matter using what kind of linking method, generating light Dislocation or overlapping between micro- film or the band that connection is attached on film, so can not avoid generating in the linking part of film It is concave-convex.Therefore, the linking part of film between niproll by when, be under pressure in the slight protrusion, generated in film sometimes Rupture, cracking (slight crack), sometimes result in the fracture of film.Particularly in the small crisp film of flexibility, easily cause these and ask Topic.
If rupture, cracking, fracture are generated in film, since the part is discarded as defective part, so the finished product of film Rate reduces, simultaneously because the removing operation of defective part or rerunning for process prepare and manufacture efficiency reduction.If in addition, in film Rupture or fracture are generated, then it is also possible to in-process is polluted due to the fragmentation of the film to disperse.
The purpose of the present invention is to provide a kind of methods, will be linked comprising the smaller optical film of toughness (flexibility) The method that is conveyed of the connection film that forms of multiple films, can not be generated in the linking part of connection film, the especially film Rupture, cracking, fracture as unfavorable condition and continuously carry out film conveying.In addition, another object of the present invention is to provide A kind of method is the method that optical film is manufactured using above-mentioned carrying method, can not be in the optical film, especially film In linking part generate rupture, cracking, fracture as unfavorable condition and be continuously manufactured by the optical film.
Solution for solving the problem
The present invention provides the carrying method of film as shown below and the manufacturing method of optical film.
[1] a kind of carrying method is the connection film of the 2nd film that will link comprising the 1st film and with its length direction terminal The side continuously conveyed by driven roller more than said one along the transport path comprising more than one driven roller Method, wherein,
In above-mentioned 1st film and above-mentioned 2nd film at least any one for charpy impact strength be less than 200kJ/m2Optical film,
The all sucking rollers of driven roller more than said one.
[2] carrying method according to [1], wherein, any one of above-mentioned 1st film and above-mentioned 2nd film are above-mentioned light Film is learned, another one is that charpy impact strength is 200kJ/m2Above lead film.
[3] carrying method according to [1], wherein, above-mentioned 1st film and above-mentioned 2nd film are above-mentioned optical film,
Above-mentioned 1st film and the optical film that above-mentioned 2nd film is identical type.
[4] carrying method according to any one of [1]~[3], wherein, at least the above 2nd film is above-mentioned optical film,
Above-mentioned connection film further includes the 3rd film linked with the length direction terminal of above-mentioned 2nd film.
[5] according to the carrying method described in any one of [1]~[4], wherein, above-mentioned optical film for have base material film and The optical film of coat thereon is laminated.
[6] a kind of manufacturing method of optical film, including following process：
It makes charpy impact strength and is less than 200kJ/m2Optical film process；With
By comprising the 1st film and with the connection film of the 2nd film of its length direction terminal connection along including more than one drive The process that the transport path of dynamic roller is continuously conveyed by driven roller more than said one,
In above-mentioned 1st film and above-mentioned 2nd film at least any one be above-mentioned optical film,
The all sucking rollers of driven roller more than said one.
[7] according to the manufacturing method described in [6], wherein, above-mentioned optical film be selected from by single layer optical film, multi-layer optical film, The optical film of drawn and the group that there is the optical film of coat to form.
[8] a kind of manufacturing method of optical film, including following process：
The process for making the 1st optical film to the 2nd optical film；With
By comprising the 1st film and with the connection film of the 2nd film of its length direction terminal connection along including more than one drive The process that the transport path of dynamic roller is continuously conveyed by driven roller more than said one,
In above-mentioned 1st film and above-mentioned 2nd film at least any one for charpy impact strength be less than 200kJ/m2The above-mentioned 1st Optical film or charpy impact strength are less than 200kJ/m2Above-mentioned 2nd optical film,
The all sucking rollers of driven roller more than said one.
[9] manufacturing method according to [8], wherein, above-mentioned 2nd optical film is selected from by single layer optical film, multilayer optical The group that film, the optical film of drawn and the optical film with coat form.
Invention effect
It according to the method for the present invention, can not be comprising toughness is smaller, i.e. flexibility smaller and crisp optical film Link film, especially its linking part in generate rupture, cracking, fracture as unfavorable condition and continuously will connection film carry out it is defeated It send.Thereby, it is possible to improve the various manufacture works for conveying the process of the connection film and having used the optical film comprising the conveying operation Stability, manufacture efficiency and the operating efficiency of sequence, while it also is able to inhibit the optical film caused by above-mentioned unfavorable condition Yield rate reduces, the yield rate of production object for improving using optical film and manufacturing.
Description of the drawings
Fig. 1 is the conveying device for representing to use in the carrying method of film of the present invention and the manufacturing method of optical film The schematic diagram of one example.
Fig. 2 is the top view for an example for schematically showing connection film.
Specific embodiment
<The carrying method of film and the manufacturing method of optical film>
The carrying method of the film of the present invention is related to a kind of method, will include the 1st film and link with its length direction terminal The 2nd film strip connection film along by conveying device construct comprising more than one driven roller transport path (warp Cross transport path), it is continuously conveyed by the more than one driven roller.In 1st film and the 2nd film at least any one be Flexibility is smaller and crisp, charpy impact strength is less than 200kJ/m2Optical film.
So-called driven roller refers to give the roller rotated freely of the driving force conveyed for film, only undertakes bearing movement The effect of film and can not give the driving force conveyed for film deflector roll (also referred to as free roll.) be not included in driven roller.Make For driven roller, representative is above-mentioned niproll, but in the present invention, driven roller more than said one all using inhale Enter roller (absorption roller), above-mentioned transport path does not include niproll.
So-called sucking roller is that many suction holes are formed in peripheral surface, can be incited somebody to action by attracting air from the suction hole The roller rotated freely of film absorption contacted with peripheral surface.It is different from niproll to suck roller, is the one side for only supporting the film passed through Roller, but due to the slip that film and roller can be prevented by above-mentioned absorption, so can the rotary driving force of roller be passed to suction Attached film, thereby, it is possible to convey film while the layer tension for keeping appropriateness.
It as sucking roller, is not particularly limited, such as metal as stainless steel, roller made of ceramics etc. can be used.For Prevent the scar on film surface band, attract trace, can also use with nickel screen, rubber, carbamate resins etc. by with film The roller of contact surface coating.
As described above, since the film linking part of connection film has, some are concave-convex, if so being carried out using by film from upper and lower The niproll of pressing is then under pressure, sometimes in linking part as driven roller when linking part is by between niproll in protrusion Generate rupture, cracking (slight crack), fracture.If making all sucking rollers of driven roller, due to the protrusion of linking part not by To pressing load, so unfavorable condition as described above can be effectively prevented.
Fig. 1 is the conveying device for representing to use in the carrying method of film of the present invention and the manufacturing method of optical film The schematic diagram of one example.Fig. 2 is the top view for an example for schematically showing connection film, is by the connection shown in Fig. 1 The figure that film amplifies and represents.
With reference to Fig. 1, an embodiment of the carrying method of film of the present invention is illustrated.Fig. 1 shows be linked with The appearance that the connection film of 1st film 10 of strip and the 2nd film 20 of strip is conveyed continuously along the transport path of conveying device. Transport path, which is included, in conveying device shown in Fig. 1 rotates film (being the 2nd film 20 in the example of Fig. 1) continuously by it The withdrawing device 50 of extraction；The deflector roll 60 of the film moved from a side bearing；Sucking roller 40 as driven roller.Although it is not shown, But be generally configured with the devices for taking-up for film roll to be taken in the downstream end of transport path, by the film after transport path successively by It batches, deflector roll is made.Solid arrow represents the conveying direction of film or the direction of rotation of withdrawing device in Fig. 1.
The conveying of connection film can for example be carried out as following.First, the 1st film 10 of the strip conveyed in advance is led to Transport path is crossed, starts continuous conveying using the rotary driving force for sucking roller 40.1st film 10 of strip is usually as being wound into The deflector roll of roll and prepare.The deflector roll is arranged to withdrawing device (withdrawing device 50 or other withdrawing devices different from it) In, it is continuously extracted out from the withdrawing device by the 1st film 10, is carried out at the same time continuous conveying.1st film 10 can be charpy impact strength Less than 200kJ/m2Optical film or above-mentioned lead film as other films.
At the end of the conveying of the 1st film 10 moves closer to, by the length direction terminal of the film with preparing in advance and being placed in The length direction beginning of the 2nd film 20 of others in withdrawing device 50 links and forms film linking part.2nd film 20 of strip also leads to Prepare frequently as the deflector roll for being wound into roll.2nd film 20 can be that charpy impact strength is less than 200kJ/m2Optical film, Can be other films as above-mentioned lead film.But when the 1st film 10 is other films, the 2nd film 20 is optical film. The switching (splicing) of deflector roll can also be carried out using turntable.
After 1st film 10 and the 2nd film 20 are linked, then, film (connection is carried out using the rotary driving force for sucking roller 40 Film) conveying.
In addition, the present invention is also relate to the manufacturing method of the optical film for the carrying method for having used above-mentioned film.That is, with reference to figure 1, the manufacturing method of optical film of the present invention includes following process in 1 embodiment：
It makes charpy impact strength and is less than 200kJ/m2Optical film process；With
By comprising the 1st film and with the connection film of the 2nd film of its length direction terminal connection along including more than one drive The process that the transport path of dynamic roller is continuously conveyed using the more than one driven roller.
Wherein, in the 1st film and the 2nd film in the process of above-mentioned conveying at least any one be by the process of above-mentioned making The charpy impact strength of making is less than 200kJ/m2Optical film.The more than one driven roller that is included in above-mentioned transport path with The carrying method of film of the present invention is identical, all sucking rollers 40.
Above-mentioned optical film can be single layer optical film, multi-layer optical film, the optical film of drawn, tool as will be described later There is optical film of coat etc..
In addition, the manufacturing method of optical film of the present invention includes following process in another embodiment：
The process for making the 1st optical film to the 2nd optical film；With
By comprising the 1st film and with the connection film of the 2nd film of its length direction terminal connection along including more than one drive The process that the transport path of dynamic roller is continuously conveyed by the more than one driven roller.
Wherein, in the 1st film and the 2nd film in the process of above-mentioned conveying at least any one be by the process of above-mentioned making The 1st optical film or the 2nd optical film made, and charpy impact strength is less than 200kJ/m2Optical film.Above-mentioned transport path In the more than one driven roller that includes it is identical with the carrying method of film of the present invention, all sucking rollers 40.
Above-mentioned 1st optical film and the 2nd optical film as will be described later, respectively can be single layer optical film, multi-layer optical film, The optical film of drawn, the optical film with coat etc..
In an example of the manufacturing method of optical film of the present invention, the charpy impact strength of the 1st optical film is low In 200kJ/m2, the 2nd optical film is multi-layer optical film.In another example of the manufacturing method of optical film of the present invention, Optical film of 2nd optical film for drawn or the optical film with coat, and charpy impact strength is less than 200kJ/m2。
Following record is related to both the carrying method of film of the present invention and the manufacturing method of optical film.
In fig. 1 and fig. 2 in shown example, the connection of film is carried out using connection with band 30, but it's not limited to that, It can certainly use and utilize methods other as the connection of heat-sealing.If using connection band 30, with utilizing heat-sealing Connection is compared, and the protrusion generated in film linking part easily becomes larger.Therefore, method of the invention applied to used connection use It is particularly effective in the case of connection film with 30.
Connection band 30 can be single-sided adhesive tape.The base material of single-sided adhesive tape for example can be by poly terephthalic acid second two Polyester based resin as alcohol ester；Cellulose-based resin as cellulose；Paper (Japan paper etc.)；Aluminium；Non-woven fabrics；Polytetrafluoroethyl-ne Chlorine-containing resins as alkene, polyvinyl chloride, polyvinylidene chloride；Polycarbonate-based resin；Polyurethane series resin；ABS resin；It is poly- Phenylethylene resin series；Polyolefin-based resins as polyethylene, polypropylene；Polyacetals system resin；Polylactic acid；Polyimides system tree Fat；The compositions such as polyamide series resin.The adhesive phase of single-sided adhesive tape can by acrylic acid series, epoxy, polyurethane series, synthesize Rubber series, EVA systems, silicone-based, vinyl chloride, chloroprene rubber system, cyanoacrylate system, isocyanates system, polyethylene The compositions such as base alcohol system, melmac system.
Using connection with band 30 come when forming film linking part, preferably according to the end face of the terminal of the 1st film 10 and the 2nd film 20 The end face at beginning become after parallel mode cuts off the end of each film, to be bonded with band 30 using connection.It cuts end It is disconnected and after its progress fitting can be it is manual, can also use device carry out automatically.In the latter case, it such as can adopt With the device and method described in Japanese Unexamined Patent Publication 2011-154371 bulletins.
The transport path of conveying connection film can also include more than two sucking rollers 40.Film will be linked along transport path Film conveying speed when continuously being conveyed is, for example, the range of 2~120m/min, the preferably range of 10~50m/min.
In order to which the rotary driving force for sucking roller 40 is effectively transferred to the connection film adsorbed thereon, preferably increase sucking The contact area of the peripheral surface of roller 40 and connection film.Therefore, link the conveying direction of film preferably when by sucking roller 40, change 10 ° or more and then 30 ° or more, in addition and then 40 ° or more.The angle refers to reference to Fig. 1, by sucking roller 40 and film conveying side Conveying direction (will be by sucking the conveying direction before roller 40) before changing with using sucking roller 40 and film conveying side Conveying direction (just by sucking the conveying direction after roller 40) angulation θ after changing.
The tension of film when the 1st film 10 conveyed in advance is continuously conveyed along transport path and film will be linked The tension of film when continuously being conveyed along transport path is, for example, 20~1500N/m, preferably 50~1000N/m, more Preferably 70~700N/m.Be such range by the tension of film, can stablize the conveying of film, thereby, it is possible to prevent because Caused by the slip of film gauffer or it is abrasive generate etc. result from the gauffer or film that abrasive generation can generate it is disconnected It splits.Due to for method of the present invention composition connection film the 1st film and the 2nd film at least any one be flexibility Smaller and crisp film, so the tension of film is set as above range is preventing gauffer or abrasive generation and the fracture of film Deng aspect be effective.
The diameter for sucking roller 40 is, for example, 100~900mm, preferably 200~400mm.By sucking a diameter of of roller 40 Such range can suitably adjust the tension of film, and thereby, it is possible to prevent caused by the slip of film gauffer or abrasive Occur etc. or result from the gauffer or the fracture of film that abrasive generation can generate etc..Due to for side of the present invention At least any one film smaller and crisp for flexibility in the 1st film and the 2nd film of the composition connection film of method, so roller will be sucked It is effective that 40 diameter, which is set as above range in terms ofs gauffer or abrasive generation and the fracture of film etc. is prevented,.
The diameter for sucking suction hole possessed by roller 40 is, for example, 0.1~10mm, preferably 0.5~5mm.Pass through suction hole A diameter of such range, the tension of film can be suitably adjusted, thereby, it is possible to prevent the gauffer caused by the slip of film Or abrasive occur etc. or result from the gauffer or the fracture of film that abrasive generation can generate etc..Due to for the present invention At least any one film smaller and crisp for flexibility in the 1st film and the 2nd film of the composition connection film of the method, so It is effective that the diameter of suction hole is set as above range in terms ofs gauffer or abrasive generation and the fracture of film etc. is prevented 's.In addition, a diameter of above range for passing through suction hole, additionally it is possible to prevent from taking the trace of suction hole on the surface of the film of conveying Mark.
The suction pressure for sucking roller 40 is, for example, 1~100kPa, preferably 2~30kPa.By the suction pressure for sucking roller 40 Power is such range, can suitably adjust the tension of film, thereby, it is possible to prevent gauffer or wiping caused by the slip of film Generation of wound etc. results from the gauffer or the fracture of film that abrasive generation can generate etc..Due to for of the present invention Method composition connection film the 1st film and the 2nd film at least any one be the smaller and crisp film of flexibility, so will inhale Entering the suction pressure of roller 40, to be set as above range in terms ofs gauffer or abrasive generation and the fracture etc. of film is prevented be effective 's.In addition, it is above range by sucking the suction pressure of roller 40, additionally it is possible to prevent the surface of the film in conveying from taking suction hole Trace.
The carrying method of the film of the present invention can be applied to continuously carry out connection film of at least part comprising optical film The process of conveying and all manufacturing processes for having used the optical film comprising the conveying operation.If enumerating specific example, for Only the process of feeding optical film, implement the processes of certain processing (such as coating processing or stretch processing) to optical film, by optics Film fits to process on other components (film etc.) etc..Further, it is also possible to applied to above patent document 4, above-mentioned patent text Offer 5, Japanese Unexamined Patent Publication 2011-154371 bulletins, International Publication No. 09/128384, International Publication No. No. 12/160966, day Process described in this special open 2009-276754 bulletins, Japanese Unexamined Patent Publication 2012-061837 bulletins etc..
<Link film>
Connection film includes the 1st film 10 and the 2nd film 20 with the connection of its length direction terminal as described above.Link film according to It needs that the 3rd film linked with the length direction terminal of the 2nd film 20, the with the length direction terminal connection of the 3rd film the 4th can be included Film ....
In 1st film 10 and the 2nd film 20 at least any one for charpy impact strength be less than 200kJ/m2Optical film.Only exist When optical film is used in one film, another film can be above-mentioned lead film.1st film 10 is lead film, the 2nd film 20 is optics The situation of film is, for example, to link optics in its terminal by transport path (or beforehand through in transport path) first by lead film Film and continue situation of transport membrane etc..1st situation that film 10 is optical film, the 2nd film 20 is lead film is, for example, to temporarily cease During conveying operation, for rerunning below, link lead film in the terminal of optical film, transport path is present in the lead film Interior state stops situation of conveying operation etc..In this case, link new optical film in the terminal of lead film and will convey Process reruns.
The two of 1st film 10 and the 2nd film 20 may be optical film.In this case, these optical films can be difference The optical film of type, or the optical film of identical type.Optical film is that identical type refers in addition to preparing in conveying (function, composition, specification are identical) other same other than deflector roll difference.
Specific composition during 3 film is included as connection film, can enumerate the film of the film of the 1st film/the 2nd/the 3rd for lead film/ Optical film/lead film, lead film/optical film/optical film, optics film/optical film/lead film, optics film/optical film/optical film Situation etc..
" charpy impact strength " in the present invention is according to JIS K 7111：2006 " plastics-Charpy impact characteristic is asked Fa-the 1：Specified in non-instrumented impact experiment " for measuring the Charpy-type test of the impact absorbing energy of plastics and The value of the impact absorbing energy of measure.In the Charpy-type test, the hammer (oscillator) that test film is punched out will try It tests piece and is punched out (fracture) required energy as impact absorbing energy along the width direction orthogonal with its length direction. In above-mentioned JIS standards, advised in the case of notched test film is used and in the case of using unnotched test film It is fixed, but due to using film as object in the present invention, so using unnotched test film.
If to being described according to the specific determination step of above-mentioned JIS standards, first from film punching or width is cut out The test film of 10mm or so, length 82mm or so.At this point, as test film, direction (MD) is squeezed out as length for the machinery for setting film Spend direction (on one side the direction for 82mm) the 1st test film and set the direction orthogonal with MD (TD) as length direction (while be The direction of 82mm) 2 kinds of the 2nd test film, due to hitting the situation of hammer from a face of film and being hit from another face In the case of tested, so respectively it is each prepare 2.Impact when then, according to by using hammer punching and test film are not The long side direction both ends of test film are fixed on supporting station by dynamic mode, and test film is measured using charpy impact test machine It is broken required energy (impact absorbing energy).The impact absorbing energy is bigger, then means that test film, i.e. film is more difficult to brokenly It splits.At this point, the MD for setting film is the 1st test film of length direction due to being broken along the direction orthogonal with MD, i.e. TD, so Give the impact absorbing energy of TD, if the TD of film be length direction the 2nd test film due to being broken along MD, so giving The impact absorbing energy of MD.
" charpy impact strength is less than 200kJ/m in the present invention2Optical film " be defined as measuring by above method Slave film a face impact hammer period of the day from 11 p.m. to 1 a.m MD and TD on impact absorbing energy value and another face impact hammer from film At least one of value of impact absorbing energy on the MD and TD of the period of the day from 11 p.m. to 1 a.m is less than 200kJ/m2Optical film.Certainly, from film The value of the impact absorbing energy of the MD and TD of one face impact hammer period of the day from 11 p.m. to 1 a.m and from the MD of another face impact hammer period of the day from 11 p.m. to 1 a.m of film and The value of the impact absorbing energy of TD is entirely below 200kJ/m2Optical film can also advantageously act as object.Due to optical film Charpy impact strength is smaller, easier to generate rupture, cracking, fracture, it is possible to which that the advantages of saying the method using the present invention is big. If the charpy impact strength of optical film is less than 190kJ/m2, then effect bigger of the invention, if less than 180kJ/m2, then effect into One step is big.
As the material for forming lead film, known material can be used, but lead film is preferably that Charpy impact is strong It spends for 200kJ/m2The film of above obdurability.If the use of charpy impact strength is 200kJ/m2Above lead film, then be difficult to brokenly It splits, so its own and the treatability being made when linking film improve.Furthermore, it is possible to be less also easy to produce the connection rupture of film, cracking, Fracture.Wherein so-called " charpy impact strength 200kJ/m2More than " refer to the one of slave film measured by above method The MD and TD of the value of impact absorbing energy on the MD and TD of the face impact hammer period of the day from 11 p.m. to 1 a.m and another face impact hammer period of the day from 11 p.m. to 1 a.m from film On impact absorbing energy all 200kJ/m of value2More than.
Lead film can be resin film, as the resin material for the charpy impact strength that can reach above range, such as Polyester based resin as polyethylene terephthalate can be enumerated；Polyvinyl chloride resin as polyvinyl chloride；It is poly- Polyolefin-based resins etc. as ethylene, polypropylene.The charpy impact strength of lead film is more preferably 250kJ/m2More than, into one Step is preferably 300kJ/m2More than.
<Optical film>
Then, the optical film that can be used in the present invention is illustrated.
(1) single layer optical film and preparation method thereof
As long as single layer optical film have translucency (preferably clear), be not particularly limited, can be include it is organic The film of material or the film comprising inorganic material.From the viewpoint of the transparency, the preference of the film comprising inorganic material For the film comprising glass material.As the film comprising glass material, Japanese Unexamined Patent Publication 2012-247785 bulletins, state can be exemplified Border discloses No. 12/090693, the glass-film described in Japanese Unexamined Patent Publication 08-283041 bulletins etc..
As the film comprising organic material, various thermoplastic resin films can be enumerated.The specific example example of thermoplastic resin The polyolefin-based resins as comprising chain polyolefin-based resins, cyclic polyolefin hydrocarbon system resin (norbornene resin etc.)； Polyester based resin as polyethylene terephthalate；(methyl) acrylic acid series as methyl methacrylate system resin Resin；Cellulose-based resin as Triafol T, cellulose diacetate；Polycarbonate-based resin；Polyvinyl alcohol system Resin；Polyvinyl acetate system resin；Polyarylate system resin；Polystyrene resin；Polyether sulfone system resin；Polysulfones system resin； Polyamide series resin；Polyimides system resins；And their mixture, copolymer etc..
In addition, " (methyl) acrylic acid " refers to selected from least one of acrylic acid and methacrylic acid in this specification. Referred to as " (methyl) acryloyl group " or " (methyl) acrylate " etc. whens it is also the same.
Optical film can contain various additives as needed.The specific example of additive includes fluorescent whitening agent, dispersion Agent, heat stabilizer, light stabilizer, ultra-violet absorber, infrared absorbent, antistatic agent, antioxidant, rubber elastomer grain Son, lubricant etc..
Ultra-violet absorber is the compound for the ultraviolet light that absorbing wavelength is below 400nm.Such as using optical film as poly- The protective film of vinyl alcohol system polarizing coating can be improved and be fitted on polarizing coating in use, by coordinating ultra-violet absorber The durability of the polarizer of the protective film.
As ultra-violet absorber, benzophenone series ultra-violet absorber, enumerate BTA system ultraviolet radiation absorption can be used Agent, acrylic ultra-violet absorber etc. are 2 if enumerating specific example, 2 '-di-2-ethylhexylphosphine oxide (4- (1,1,3,3- tetramethyls Base butyl) -6- (2H- benzotriazole -2- bases) phenol)；- 5- chlorobenzenes are simultaneously by 2- (2 '-hydroxyl -3 '-tertiary butyl -5 '-aminomethyl phenyl) Triazole；2,4- di-t-butyl -6- (5- chlorobenzotriazole -2- bases) phenol；2,2 '-dihydroxy -4,4 '-dimethoxy hexichol first Ketone；2,2',4,4'-tetrahydroxybenzophenone etc..In them, 2,2 '-di-2-ethylhexylphosphine oxide (4- (1,1,3,3- tetramethyl butyl) -6- (2H- benzotriazole -2- bases) phenol) it is one of preferred ultra-violet absorber.
The use level of ultra-violet absorber preferably preferably becomes according to the light transmittance of below the wavelength 370nm of optical film Less than 10%, more preferably become less than 5%, further preferably selected as less than 2% mode.As containing ultraviolet radiation absorption The method of agent, such as following methods etc. can be enumerated：Ultra-violet absorber is cooperated in resin in advance and is granulated, by molten Melt the method that extrusion etc. is configured to film；The method for directly adding ultra-violet absorber in the melting extrusion forming of resin.
Infrared absorbent is the compound for the infrared ray that absorbing wavelength is more than 800nm.Such as nitroso can be enumerated Compound and its metallic complex salt；Cyanine based compound；Side's acid based compound；Mercaptan nickel complex salt based compound；Phthalocyanine system Compound；Naphthalene phthalocyanine based compound；Triarylmethane based compound；Imonium based compound；Diimmonium based compound；Naphthoquinones system Close object；Anthraquinone based compound；Amino-compound；Ammonium salt based compound；Carbon black；Tin indium oxide；Antimony tin；Belong to periodic table Oxide, carbide or boride of the metal of 4A races, 5A races or 6A races etc..Infrared absorbent is preferably complete according to that can absorb The mode of portion's infrared ray (light for the range that wavelength is about 800~1100nm) selects, and can also be two kinds or more.Infrared ray The use level of absorbent is for example preferably in a manner that the light transmittance of more than the wavelength 800nm of optical film becomes less than 10% Selection.
Optical film for thermoplastic resin film, especially (methyl) acrylic resin film when, compound rubber elastomer particle It is preferred in terms of its Film making properties is improved.Rubber elastomer particle is the particle of the layer comprising display caoutchouc elasticity.Rubber Elastomer particle can be the particle of the layer only comprising display caoutchouc elasticity or have the same of the layer of display caoutchouc elasticity When the particle with other layers of multilayered structure.As rubber elastomer, such as olefin-based elastomeric polymer, diene can be enumerated It is elastomeric polymer, styrenic-diene system elastocopolymer, acrylic flexible polymer etc..Wherein, from the surface of optical film , it is preferable to use acrylic flexible polymer from the perspective of hardness, light resistance and the transparency.
Acrylic flexible polymer can be made of the polymer using alkyl acrylate as main body.With alkyl acrylate Base ester is as the homopolymer or 50 weight % more than acrylic acid alkyls that the polymer of main body can be alkyl acrylate The copolymer of the monomer of ester and below 50 weight % in addition to it.It is former usually using the carbon of the alkyl as alkyl acrylate Subnumber is 4~8 alkyl acrylate.When making the monomer copolymerization in addition to alkyl acrylate, as its example, can enumerate Alkyl methacrylate as going out methyl methacrylate or ethyl methacrylate；Styrene or ring-alkylated styrenes are such Styrenic monomers；The monofunctional monomers such as unsaturated nitrile as acrylonitrile or methacrylonitrile and (methyl) acrylic acid The alkenyl esters of unsaturated carboxylic acid as allyl ester or (methyl) methallyl acrylate；Two as diallyl maleate The diene base ester of first acid；Unsaturated carboxylic acid diester of glycols etc. is multifunctional as aklylene glycol two (methyl) acrylate Monomer.
Rubber elastomer particle comprising acrylic flexible polymer is preferably with acrylic flexible polymer The particle of the multilayered structure of layer.Specifically, can enumerate has in the outside of acrylic elastomer with methacrylic acid alkane Base ester as 2 layers of structure of the polymeric layer of the hard of main body particle so that the inside of acrylic elastomer have with Particle of the alkyl methacrylate as the 3-tier architecture of the polymeric layer of the hard of main body.Composition is formed in acrylic acid series bullet Property body outside or inside hard polymeric layer the polymer using alkyl methacrylate as main body preferably with Polymer of the methyl methacrylate as main body.The acrylic rubber elastomer particle of multilayered structure can be for example, by day Method described in this examined patent publication 55-027576 bulletins manufactures.
It, can especially in the case of for (methyl) acrylic resin film if coordinating lubricant in optical film The sliding of optics film surface is improved, improves rolling tightly and then the packaging style in the state of deflector roll is made when deflector roll is made.If Lubricant and above-mentioned rubber elastomer particle are used in combination, then can further improve sliding improvement effect.As lubricant, have Stearic acid based compound, (methyl) acrylic compounds, ester based compound etc., wherein, it is preferable to use stearic acid based compound.
The thickness of single layer optical film is usually 2~300 μm or so, and preferably 200 μm hereinafter, more preferably less than 150 μm.
Single layer optical film can be made by arbitrary methods such as extrusion by melting, solvent cast methods.Such as it is melting In the case of extrusion molding, it is preferred to use in the state for sandwiching the resin (thermoplastic resin) of melting extrusion with two metal rolls Under the method that is filmed.In this case, metal roll is preferably mirror roller, excellent thereby, it is possible to obtain surface smoothness Optical film.
(2) multi-layer optical film and preparation method thereof
Optical film may be the multi-layer optical film being made of 2 layers, 3 layers or the multilayered structure more than it.Multi-layer optical film Be constructed without especially limit, such as following such embodiment can be exemplified.
Multilayer optical obtained from the layer for being included as identical type but mutually different resin is combined and be coextruded by (a) Film is learned (for example, comprising the 1st layer containing (methyl) acrylic resin and including (methyl) acrylic resin being different from The 2nd layer of multi-layer optical film),
Multi-layer optical film obtained from layer comprising different types of resin is combined and be coextruded by (b) is (for example, packet Multi-layer optical film containing the 1st layer containing (methyl) acrylic resin and the 2nd layer containing polystyrene resin),
(c) combines the mutually different layer of the type or content of (or identical) resin comprising identical type but additive And multi-layer optical film obtained from being coextruded,
(d) by above-mentioned single layer optical film or multi-layer optical film by squeeze out lamination and be overlapped obtain multi-layer optical film,
(e) via multi-layer optical film obtained from bonding agent or adhesive fitting or incites somebody to action above-mentioned single layer optical film Single layer optical film is more obtained from being bonded with multi-layer optical film, multi-layer optical film with multi-layer optical film via bonding agent or adhesive Layer optical film.
Multi-layer optical film obtained from the coextrusion of above-mentioned (a)~(c) is carried out in addition to that will form the resin combination of each layer Other than multi-layer co-extruded, making can be carried out similarly with single layer optical film.
The multi-layer optical film of above-mentioned (d) can be multi-layer optical film obtained from the film of identical type is overlapped, can also It is multi-layer optical film obtained from different types of film is overlapped.The multi-layer optical film of above-mentioned (d) can be by melting extrusion Optical film on extracted out from certain side in process and other optical films be laminated, pressurization and be bonded, cooled down, pass through coiling machine Roll is coiled into make.Alternatively, can be by extracting optical film out from the side in process, melting extrusion resin layer on it, Further other optical films are extracted out from the opposite side in process and are laminated on above-mentioned resin layer, similarly pressurize and be bonded, It is cooled down, roll is coiled by coiling machine to make.It is sometimes excellent in order to improve the fitting adhesive strength between each film of lamination Choosing to any layer in the layer of lamination or all passes through sided corona treatment, ozone treatment, anchoring before being laminated or with being laminated simultaneously The methods of paint processing, bonding agent coating processing, suitably carries out improved in adhesion processing.In addition, the number for the layer being laminated is without spy It does not limit, necessary layer can also suitably be laminated or implements above-mentioned processing as needed in lamination.
Can be the resin (packet comprising identical type when single layer optical film is bonded by the multi-layer optical film of above-mentioned (e) each other Containing the situation for same resin and be different resins situation.) layer combination or include different types of tree The combination of the layer of fat.In addition, can also be as described above single layer optical film and multi-layer optical film combination or multi-layer optical film with The combination of multi-layer optical film.One example of the multi-layer optical film of (e) is via bonding agent at least one face of polarizing coating Or adhesive is fitted with the multi-layer optical film of thermoplastic resin film.Polarizing coating can be to make dichroism pigment gas absorption quantity in poly- second The film of alkenyl alcohol resin film and polarization characteristic as defined in imparting.
As bonding agent, water system bonding agent or no-solvent type bonding agent can be used.Water system bonding agent for example can be will Bonding agent ingredient as water-soluble cross-linked property epoxy system resin or hydrophilic carbamate system resin is dissolved into water Obtained from substance or substance obtained from the bonding agent ingredient is distributed in water.
No-solvent type bonding agent is the solvent not comprising significant quantity, comprising (such as purple by heating or active energy beam Outside line, visible ray, electron ray, X ray etc.) irradiation and carry out reacting cured curability composition (monomer or oligomer), Pass through the bonding agent for being solidified to form adhesive layer of the curability composition, it is typical that can be comprising above-mentioned curability into Divide the bonding agent with polymerization initiator.
As above-mentioned curability composition, epoxy system resin, carbamate system resin, cyanoacrylate system can be enumerated Resin, (methyl) acrylamide resin etc..
In addition, as adhesive, such as can use comprising (methyl) acrylic resin, silicone-based resin, Polyester The adhesive composition of the base polymers such as resin, polyurethane series resin or polyether system resin and crosslinking agent.Adhesive composition Such as the additives such as antistatic agent can be further included.Adhesive composition fully carries out utilizing friendship preferably by curing Join the composition of the reaction of agent.Cooking conditions are not particularly limited, such as can be in the environment of 23 DEG C of temperature, relative humidity 65% Lower progress a few houres~cure for several days.
Optical film can also be the optical film that stretch processing is implemented to the thermoplastic resin film made as described above.For Obtain the optical film with desired optical characteristics, it is sometimes desirable to stretch processing.As stretch processing, single shaft can be enumerated It stretches or biaxial stretch-formed etc..As draw direction, mechanical flow direction (MD), the orthogonal to that side of unstretching film can be enumerated To direction of (TD) and mechanical flow direction (MD) oblique etc..Biaxial stretch-formed can be carried out at the same time stretching along 2 draw directions While it is biaxial stretch-formed or stretched along other directions after being stretched along prescribed direction gradually biaxial stretch-formed.
Stretch processing for example can be by using niproll more than two couple for the peripheral speed for increasing outlet side, along length Spend direction (mechanical flow direction：MD it) is stretched or is held the two side ends of unstretching film chuck and edge and mechanical flow The orthogonal direction (TD) in dynamic direction is extended to carry out.
Utilize the stretching ratio preferably 0~300%, more preferably 100~250% of stretch processing.If stretching ratio is more than 300%, then film thickness become too thin and become to be easily broken off or treatability reduce.Stretching ratio is obtained by following formula：
Stretching ratio (%)=100 × { (length after stretching)-(length before stretching) }/(length before stretching).
In addition, in order to assign desired optical characteristics, instead of stretch processing or at the same time, can also will be heat-shrinked Property film fit on thermoplastic resin film, into exercise thermoplastic resin film shrink processing.
(3) there is the optical film of coat
By assigning coat to optical film, specific function corresponding with the type of coat can be assigned.If it enumerates The example of the optical film of coat is provided, then is, for example,
(a) have for prevent surface abrasive hard conating optical film,
The optical film of (b) with antistatic layer,
The optical film of (c) with anti-reflection layer,
The optical film of (d) with stain-proofing layer,
(e) have undertake improve visibility, prevent the mirroring of exterior light, reduces prismatic lens and colour filter because interfering Caused by Moire fringe etc. antiglare layer optical film.
As the base material film that above such coat is laminated, individual layer as above-mentioned thermoplastic resin film can be used Optical film or multi-layer optical film.
In addition, as base material film, the optical film for coat being laminated on single-layer or multi-layer optical film can also be used There is the multi-layer optical film of coat obtained from being bonded with other single layer optical films or multi-layer optical film.
If coat particularly is set in (methyl) acrylic resin film, sometimes the charpy impact strength of optical film Extremely become smaller compared with before setting coat, relative to the small optical film of charpy impact strength like this, suitable for applying this hair It is bright.
(hard conating)
Hard conating has the function of the case hardness for improving optical film, is scratch on surface etc. in order to prevent and sets. Hard conating is preferably in JIS K 5600-5-4：1999 " coating ordinary test methods-the 5：Engineering properties-Section 4 of film： Optical film with hard conating (is placed on glass plate and carries out by pencil hardness test specified in scratch hardness (pencil method) " Measure) in the display 2H or value harder than its.The material for forming hard conating is generally through heat or light and cured material.It such as can Enumerate organic silicone system, melamine series, epoxy, (methyl) acrylic acid series, carbamate (methyl) acrylic ester Etc. organic hard painting inorganic hard painting material such as material or silica.It is (methyl) third in the base material film that hard conating is laminated in them In the case of olefin(e) acid resin film, due to good relative to its bonding force, productivity is excellent, and it is advantageous to carbamates (methyl) acrylic ester or multifunctional (methyl) acrylate system apply material firmly.
According to expectation, the raising of adjustment, the modulus of elasticity in static bending for refractive index, the stabilisation of cubical contraction, And the raising of heat resistance, antistatic property, anti-glare etc., hard conating can contain various fillers.In addition, hard conating can also contain There are the additives such as antioxidant, ultra-violet absorber, light stabilizer, antistatic agent, levelling agent, antifoaming agent.
(antistatic layer)
Antistatic layer is set to assign electric conductivity, influence that inhibition is generated by electrostatic etc. to the surface of optical film 's.In the formation of antistatic layer, such as it may be used and will be coated with containing the resin combination of conductive material (antistatic agent) Method on to base material film.For example, by the way that antistatic agent coexists in the hard painting material for being used to form above-mentioned hard conating, it can Form the hard conating of antistatic property.
(anti-reflection layer)
Anti-reflection layer is the layer for preventing the reflection of exterior light, directly or across other layers such as hard conating is set In the surface of optical film (in the face that outside is exposed).Optical film with anti-reflection layer is 430~700nm preferably with respect to wavelength Light 5 ° of incidence angle under reflectivity be 2% hereinafter, under the identical incidence angle for the light for being particularly preferably 550nm relative to wavelength Reflectivity be less than 1%.
The thickness of anti-reflection layer can be set as 0.01~1 μm or so, but preferably 0.02~0.5 μm.Anti-reflection layer can Be comprising the small refractive index of the refractive index with layer (base material film or hard conating etc.) than setting it, specifically 1.30~ The layer of the low-index layer of 1.45 refractive index the low-index layer of the film comprising inorganic compound and will include inorganic chemical Layer etc. obtained from the high refractive index layer of the film of object is alternately laminated multilayer.
As long as the small material of the material refractive index for forming above-mentioned low-index layer is then not particularly limited.Such as it can arrange Resin material as enumerating ultra-violet solidified (methyl) acrylic resin；In resin as dispersion colloid silica Hybrid material obtained from inorganic particles；Sol-gel material comprising alkoxy silane etc..Such low-index layer can be with It is formed by being coated with the polymer of oneself polymerization, it can also be by being applied with becoming the state of the monomer of precursor or oligomer Cloth makes its polymerizing curable and is formed later.In addition, in order to assign soil resistance, each material preferably comprises intramolecular with fluorine atom Compound.
As the sol-gel material for being used to form low-index layer, suitable for using the material in molecule with fluorine atom. If enumerating the typical example of sol-gel material of the intramolecular with fluorine atom, there is perfluoroalkyl alkoxy silane.Entirely Alkoxysilane for example can be following formula compound represented：
CF3(CF2)nCH2CH2Si(OR)3
Wherein, R represents the alkyl that carbon atom number is 1~5, and n represents 0~12 integer.Wherein, the n in preferably above-mentioned formula For 2~6 compound.
As the specific example of perfluoroalkyl alkoxy silane, following such compound can be enumerated.
3,3,3- trifluoro propyl trimethoxy silanes,
3,3,3- trifluoro propyl triethoxysilanes,
3,3,4,4,5,5,6,6,7,7,8,8,8- ten trifluoro octyl group trimethoxy silanes,
3,3,4,4,5,5,6,6,7,7,8,8,8- tridecafluoro-n-octyltriethoxysilanes,
3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10- ten seven fluorine decyl trimethoxy silanes,
3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10- ten seven fluorine decyl triethoxysilanes etc..
Low-index layer can also be by Thermocurable fluorochemical or active energy ray-curable fluorochemical Solidfied material is formed.The solidfied material preferably its coefficient of kinetic friction is in the range of 0.03~0.15, preferably with respect to the contact angle of water In the range of 90~120 °.As curable fluorine-containing compound, in addition to the silane compound containing poly- fluoroalkyl is (for example, above-mentioned 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10- ten seven fluorine decyl triethoxysilanes etc.) other than, can also enumerate Provide the fluoropolymer of crosslinking property functional group.
Fluoropolymer with cross-linking functional group can be manufactured by following methods：Fluorochemical monomer is handed over having The method of the monomer copolymerization of Lian Xing functional groups；Alternatively, by fluorochemical monomer and the monomer copolymerization with functional group, then in polymer In functional group on addition have cross-linking functional group compound method.
As fluorochemical monomer used herein, such as vinyl fluoride, vinylidene fluoride, tetrafluoroethene, hexafluoro third can be enumerated The part of fluoroolefins class as alkene, perfluor -2,2- dimethyl -1,3- dioxole and (methyl) acrylic acid or Fully fluorinated alkyl derivative class, complete or partial fluorinated vinyl ethers etc..
As the monomer with cross-linking functional group or the compound with cross-linking functional group, acrylic acid contracting can be enumerated Water glyceride or the such monomer with glycidyl of glycidyl methacrylate；Acrylic or methacrylic acid that The monomer with carboxyl of sample；Hydroxyalkyl acrylates or the such list with hydroxyl of haloalkylacrylates Body；Allyl acrylate or the such monomer with alkenyl of allyl methacrylate；Monomer with amino；With sulfonic acid Monomer of base etc..
From that can improve marresistance aspect, the material for being used to form low-index layer can also be by comprising dioxy The inorganic compounds particle such as SiClx, aluminium oxide, titanium dioxide, zirconium oxide, magnesium fluoride is scattered in the colloidal sol that is formed in alcoholic solvent Substance is formed.From the viewpoint of antireflection, the refractive index of used inorganic compound particle is smaller the more preferred thus.Institute It can be the particle for having gap to state inorganic compound particle, the hollow minute particle of particularly preferred silica.Hollow minute particle is put down Equal grain size is preferably in the range of 5~2000nm, especially more preferably in the range of 20~100nm.Here so-called average grain Diameter is the number average bead diameter being obtained by transmission electron microscope observation.
(stain-proofing layer)
Stain-proofing layer is set to assign water proofing property, grease proofness, absorption of perspiration, soil resistance etc..It is used to form stain-proofing layer Preferred material be fluorinated organic compound.As fluorinated organic compound, fluorine carbon, perfluor silane, their height can be enumerated Molecular compound etc..According to the material formed, the forming method of stain-proofing layer may be used to be deposited or be sputtered to typical example Physical vaporous deposition, chemical vapour deposition technique, wet application method etc..The average thickness of stain-proofing layer is usually 1~50nm or so, Preferably 3~35nm.
(antiglare layer)
The optical film that antiglare layer is laminated on base material film is known as antiglare film.I.e. antiglare film includes base material film and anti-dazzle Layer.Antiglare layer is the layer for having fine concaveconvex shape on surface, it is preferable to use above-mentioned applies material and formed firmly.
On surface, the antiglare layer with fine concaveconvex shape can be formed by following methods：1) shape on base material film Into containing fine-grained film, the concave-convex method based on the particle is set；2) it is formed containing particle or not contained on base material film After the film of particle, the roller that concaveconvex shape is imparted with surface abuts and transfers the method (also referred to as embossing) of concaveconvex shape Deng.
It, can be by the way that the hardening resin composition of curability transparent resin and particle will be included in above-mentioned method 1) It is applied on base material film, is irradiated by light such as ultraviolet lights or heating makes coating layer be solidified to form antiglare layer.The transparent tree of curability Fat is preferably selected from the material as high rigidity (hard to apply).As the curability transparent resin, can be consolidated using ultraviolet light The property changed light-cured resin as resin, heat-curing resin, electron ray curing resin etc., but from productivity or obtain The viewpoints such as the hardness of antiglare layer set out, it is preferable to use light-cured resin.More preferable uv curing resin.Consolidated using light During the property changed resin, hardening resin composition further includes Photoepolymerizationinitiater initiater.
As light-cured resin, generally using multifunctional (methyl) acrylate.Its specific example includes trihydroxy methyl The two of propane or three-(methyl) acrylate；The three-of pentaerythrite or four-(methyl) acrylate；Have extremely as intramolecular Polyfunctional carbamate (methyl) acrylic acid of (methyl) acrylate of few 1 hydroxyl and the reaction product of diisocyanate Ester etc..These multifunctional (methyl) acrylates can use individually or two or more is applied in combination as needed.
Further, it is also possible to by polyfunctional carbamate (methyl) acrylate, polyalcohol (methyl) acrylate and tool There is the mixture of (methyl) acrylate copolymer of the alkyl comprising 2 or more hydroxyls as light-cured resin.Form the light Polyfunctional carbamate (methyl) acrylate of curable resin is for example using (methyl) acrylic acid and/or (methyl) propylene Acid esters, polyalcohol and diisocyanate manufacture.Specifically, by (methyl) acrylic acid and/or (methyl) acrylate and Polyalcohol, preparing intramolecular has hydroxyl (methyl) acrylate of at least one hydroxyl, and makes itself and di-isocyanate reaction, Polyfunctional carbamate (methyl) acrylate can be manufactured.Polyfunctional carbamate (methyl) acrylic acid manufactured in this way Ester also becomes the light-cured resin itself enumerated before.When it is manufactured, (methyl) acrylic acid and/or (methyl) acrylate Two or more can also can be applied in combination, polyalcohol and diisocyanate can similarly make respectively respectively using a kind With a kind, two or more can also be applied in combination.
(methyl) acrylate as a raw material of polyfunctional carbamate (methyl) acrylate can be (first Base) chain of acrylic acid or cyclic alkyl ester.As its specific example, (methyl) methyl acrylate, (methyl) third can be enumerated (methyl) propylene as olefin(e) acid ethyl ester, (methyl) propyl acrylate, (methyl) isopropyl acrylate, (methyl) butyl acrylate (methyl) acrylate base ester as acid alkyl ester and (methyl) cyclohexyl acrylate.
Polyalcohol as another raw material of polyfunctional carbamate (methyl) acrylate has extremely for intramolecular The compound of few 2 hydroxyls.Such as ethylene glycol, propylene glycol, 1,3-PD, diethylene glycol, dipropylene glycol, new penta can be enumerated Glycol, 1,3-BDO, 1,4-butanediol, 1,6- hexylene glycols, 1,9- nonanediols, 1,10- decanediols, 2,2,4- trimethyl -1, 3- pentanediols, 3- methyl-1s, 5- pentanediols, the neopentyl glycol ester of 3-hydroxypivalic acid, cyclohexane dimethylol, Isosorbide-5-Nitrae-hexamethylene two Alcohol, spiral shell glycol, tristane dihydroxymethyl, hydrogenated bisphenol A, ethyleneoxide addition bisphenol-A, propylene oxide addition bisphenol-A, three hydroxyls Methyl ethane, trimethylolpropane, glycerine, 3- methylpentanes -1,3,5- triols, pentaerythrite, dipentaerythritol, three seasons penta 4 Alcohol, glucose etc..
Diisocyanate as another raw material of polyfunctional carbamate (methyl) acrylate is intramolecular tool There is the compound of the isocyanato- base (- NCO) of 2, the various diisocyanates of aromatic series, aliphatic or ester ring type can be used Ester.As specific example, tetramethylene diisocyanate, hexamethylene diisocyanate, two isocyanide of isophorone can be enumerated Acid esters, 2,4- toluene di-isocyanate(TDI)s, 4,4 '-diphenyl diisocyanate, 1,5- naphthalene diisocyanates, 3,3 '-dimethyl -4, 4 '-diphenyl diisocyanate, xylene diisocyanate, trimethyl hexamethylene diisocyanate, 4,4 '-diphenyl methane Diisocyanate and the core hydride of the diisocyanate with aromatic rings in them etc..
Polyalcohol (first with forming above-mentioned light-cured resin together with polyfunctional carbamate (methyl) acrylate Base) (methyl) acrylate of acrylate for compound (that is, polyalcohol) of the intramolecular at least two hydroxyl.As it Specific example can enumerate pentaerythrite two (methyl) acrylate, pentaerythrite three (methyl) acrylate, pentaerythrite four (methyl) acrylate, dipentaerythritol six (methyl) acrylate, 1,6- hexylene glycols two (methyl) acrylate etc..Polyalcohol (methyl) acrylate can only be used alone a kind, can also be two kinds or more.Polyalcohol (methyl) acrylate is preferred Include pentaerythritol triacrylate and/or pentaerythritol tetraacrylate.
And then the structure together with these polyfunctional carbamate (methyl) acrylate and polyalcohol (methyl) acrylate Into light-cured resin (methyl) acrylate copolymer with the alkyl comprising 2 or more hydroxyls in a Component units With the alkyl for including 2 or more hydroxyls.Such as can enumerate comprising (methyl) acrylic acid 2,3- dihydroxy propyl ester is as composition The polymer of unit or with (methyl) acrylic acid 2,3- dihydroxy propyl ester together include the 2- hydroxy methacrylate conducts of (methyl) acrylic acid Polymer of Component units etc..
By using the light-cured resin of (methyl) acrylic acid series as above illustrate, can obtain and base material film Adaptation improve, mechanical strength improve, can be effectively prevented surface damage antiglare film.
As above-mentioned particle, it is preferable to use average grain diameter for 0.5~5 μm and with the curability transparent resin after curing Refringence is 0.02~0.2 particle.It, can be effective by using the particle of average grain diameter and refringence in the range Ground embodies mist degree.The average grain diameter of the particle can be obtained by dynamic light scattering method etc..Average grain diameter at this time becomes Weight average particle diameter.
Particle can be organic fine particles or inorganic particles.As organic fine particles, generally using resin particle, such as can enumerate Go out to be crosslinked poly- (methyl) acrylic particles, methyl methacrylate/styrene copolymer resin particle, crosslinked polystyrene grain Son, crosslinked polymethylmethacrylaparticles particle, silicone resin particle, polyimide particle etc..In addition, as inorganic particles, it can To use silica, colloidal silicon dioxide, aluminium oxide, alumina sol, aluminosilicate, alumina silica composite oxygen Compound, kaolin, talcum, mica, calcium carbonate, calcium phosphate etc..
As above-mentioned Photoepolymerizationinitiater initiater, acetophenone system, benzophenone series, benzoin ether system, amine system, oxidation can be used The various substances such as phosphine system.If enumerating the example for the compound for being classified as acetophenone system Photoepolymerizationinitiater initiater, there is 2,2- bis- Methoxyl group -2- phenyl acetophenones (alias benzil dimethyl ketal), 2,2- diethoxy acetophenones, 1- (4- cumenes Base) -2- hydroxy-2-methyl propane -1- ketone, 1- hydroxycyclohexylphenylketones, 2- methyl -2- morpholinoes -1- (4- methyl thio benzene Base) propane -1- ketone etc..If enumerating the example for the compound for being classified into benzophenone series Photoepolymerizationinitiater initiater, there is hexichol Ketone, 4- chlorobenzophenones, 4,4 '-dimethoxy-benzophenone etc..Draw if enumerating and being classified into the photopolymerization of benzoin ether system The example of the compound of agent is sent out, then has benzoin methyl ether, benzoin propyl ether etc..Amine system photopolymerization is classified into if enumerating The example of the compound of initiator has N, N, N ', N '-tetramethyl -4,4 '-diaminobenzophenone (alias Michler's keton) etc..If The example of phosphine oxide system Photoepolymerizationinitiater initiater is enumerated, then has 2,4,6-trimethylbenzoyldiphenylphosphine oxide etc..In addition, Xanthone based compound or thioxanthones based compound etc. can also be used as Photoepolymerizationinitiater initiater use.
These Photoepolymerizationinitiater initiaters are commercially available.If enumerating the example of representative commercially available product with trade name, have by auspicious " IRGACURE907 " and " IRGACURE184 " of Ciba's sale of the scholar, " Lucirin sold by BASF AG of Germany TPO " etc..
Hardening resin composition can contain solvent as needed.As solvent, such as ethyl acetate, vinegar can be used Acid butyl ester etc. can dissolve the arbitrary organic solvent for each ingredient for forming hardening resin composition.It can also be by two or more Organic solvent be used in mixed way.
In addition, hardening resin composition can also contain levelling agent, such as the levelling of fluorine system or silicone-based can be enumerated Agent.There are reactive silicone, dimethyl silicone polymer, polyether-modified dimethyl silicone polymer, poly- methyl in the levelling agent of silicone-based Alkylsiloxane etc..In silicone-based levelling agent, preferred reactive silicone and siloxane-based levelling agent.If using reactivity is included The levelling agent of silicone, then can to anti-glare layer surface assign sliding, can make excellent marresistance long lasting for.This Outside, if using siloxane-based levelling agent, film formability can be improved.
On the other hand, the antiglare layer with fine surface unevenness profile is being formed by above-mentioned method (embossing) 2) In the case of, as long as using the mold for being formed with micro concavo-convex shape, by the shape transfer of mold to the tree being formed on base material film In lipid layer.When forming fine surface unevenness profile, it can be contained transferred with the resin layer of concaveconvex shape by embossing Particle can not also contain particle.The resin for forming above-mentioned resin layer is preferably the light as being illustrated in above-mentioned method 1) Curable resin, more preferably uv curing resin.But replace ultraviolet light by proper choice of Photoepolymerizationinitiater initiater Curable resin, can also use being capable of cured visible-light curing resin than the visible ray of ultraviolet line length with wavelength.
In embossing, by the hardening resin composition that will include the light-cured resins such as uv curing resin It is applied on base material film, makes its curing while the coating layer is pressed on the male and fomale(M＆F) of mold, so as to the bumps of mold Face is transferred on coating layer.More specifically, by the way that hardening resin composition is applied on base material film, make coating layer With the male and fomale(M＆F) of mold it is closely sealed in the state of, from base material film side, the irradiation light such as ultraviolet light cure coating layer, then, will have solid The optical film of coating layer (antiglare layer) after change is removed from mold, so as to which the concaveconvex shape of mold is transferred in antiglare layer.
The thickness of antiglare layer is not particularly limited, generally 2~30 μm, preferably 3 μm or more, and preferably 20 μm with Under.If antiglare layer is excessively thin, it cannot get sufficient hardness, there are the tendency that surface is easily damaged, on the other hand, if blocked up, In the presence of become to be easily broken or film because antiglare layer cure shrinkage occur curling due to productivity reduce tendency.
The haze value of antiglare film is preferably in the range of 1~50%.If haze value is too small, it cannot get sufficient anti-glare Can, become mirroring for easy generation exterior light in picture when in applied to image display device.On the other hand, if its mist degree Be worth it is excessive, although then mirroring for exterior light can reduce, the resolution ratio (レ ま り) of the picture of black display reduces.Mist degree Value is ratio of the diffused transmission rate relative to total light transmittance, according to JIS K 7136：2000 " the mists of plastics-transparent material Degree seeks method " and measure.
As described above when setting coat on optical film, the application width of the coat can be the complete of optical film Width can also set non-painting portion at width direction both ends.The width of the non-painting portion of each end can be film overall with 0.05~20% or so.If the width of non-painting portion is more than 0.05%, due to that can inhibit the cure shrinkage because of coating layer Caused by film end curling (alice), so film conveying or film connection (splicing) become easy.On the other hand, in non-application When the width in portion is less than 0.05%, curling is easily generated in film end, according to circumstances also generates the height from film horizontal part sometimes Spend the curling for more than 10mm.But it even in the case of generating such curling, according to the present invention, can also not produce It is conveyed in the case of filming rupture etc..
Embodiment
Hereinafter, show that the present invention is further specifically described in embodiment, but the present invention is not limited by these examples.
<Embodiment 1>
(A) making of (methyl) acrylic resin film
As (methyl) acrylic resin, prepare methyl methacrylate/acrylic acid methyl esters (weight ratio 96/4) Copolymer.In addition, as rubber elastomer particle, when preparing the elastomer particle of following three-deckers and not having outermost layer Average grain diameter be about 250nm acrylic flexible polymer particle, in three-decker, innermost layer is included in methacrylic acid Be copolymerized the polymer for the hard that a small amount of allyl methacrylate forms on methyl esters, middle layer include using butyl acrylate as The soft elastomer that main component and on it co polystyrene and a small amount of allyl methacrylate form, it is outermost Layer is included in the polymer that the hard that a small amount of ethyl acrylate forms is copolymerized on methyl methacrylate.
By above-mentioned (methyl) acrylic resin and rubber elastomer particle with 70/30 weight ratio cooperation and into one Step has coordinated the lubricant (stearic acid) of 0.05 parts by weight and the benzene of about 1.0 parts by weight relative to their total 100 parts by weight And the particle of triazole system ultra-violet absorber is put into the single screw extrusion machine of 65mm φ, is 275 DEG C T-shaped from set temperature Mould squeezes out.The two sides of membranaceous molten resin squeezed out is set as with temperature to 45 DEG C of two with minute surface piece polishing roll to sandwich And cool down, (methyl) acrylic resin film for the strip that thickness is 80 μm is obtained as deflector roll.
(B) making of antiglare film
The single side of (methyl) acrylic resin film made in above-mentioned (A), coating include (methyl) acrylic ester Uv curing resin, Photoepolymerizationinitiater initiater, resin particle and solvent antiglare layer formation coating fluid, make it dry Afterwards, ultraviolet light is irradiated from the coating layer side of film, cures coating layer, the surface for being produced on (methyl) acrylic resin film is formed There is the antiglare film for the strip for having irregular antiglare layer.Obtained antiglare film is wound to a diameter of 6 inches (about 15cm's) On core, as deflector roll.Using haze meter, the haze value of the antiglare film, result 1.5% are measured.In addition, the thickness of the antiglare film It is 89 μm.
The charpy impact strength of obtained antiglare film is measured by following step.First, width is cut out from antiglare film The rectangular test film of 10mm × length 82mm.As test film, due to the situation from antiglare layer side impaction hammer and from It is tested in the case of side impaction opposite with antiglare layer side, so respectively cutting out 2 respectively, being 4 total for measuring MD Impact absorbing energy test film and test film for measuring the impact absorbing energy on TD.Then, it is hammered into shape according to pass through Impact during sub- punching and the long side direction both ends of test film are fixed on supporting station by the motionless mode of test film, according to above-mentioned Determination step, make made charpy impact test machine (hammer weigh for 1.0J) using Co., Ltd.'s peace field essence mechanism, will hammer into shape Son becomes parallel mode from antiglare layer according to its corner length direction in length direction central portion and the width direction of test film Side is hit, and measures the required energy of fracture (impact absorbing energy) of film.As a result, the impact absorbing energy of TD is 17kJ/m2, the impact absorbing energy of MD is 19kJ/m2.In addition, from the TD's and MD with the antiglare layer side opposite side impact hammer period of the day from 11 p.m. to 1 a.m Impact absorbing energy is respectively 8kJ/m2、11kJ/m2.In addition, become convex mode by antiglare film finger pair according to antiglare layer side Folding, as a result antiglare film fracture.
(C) link the conveying of film
By the length direction terminal of antiglare film made in above-mentioned (B) using connection with (using thickness as 60 μm of packet Single-sided adhesive tape of the film containing polytetrafluoroethylene (PTFE) as base material) (thickness is 38 μm of poly terephthalic acid second two to connection lead film Alcohol ester film) the connection film that forms is by the transport path that includes sucking roller, with 1~40m/min of conveying speed using sucking roller Rotary driving force is continuously conveyed.It sucks roller and uses a diameter of 300mm, the roller of a diameter of 3mm of suction hole.In addition, it inhales Enter the suction pressure of roller for 5~25kPa, film will be by sucking conveying direction and the just conveying direction institute after before roller Into angle, θ (with reference to Fig. 1) be 90 ° or more, the tension of film during conveying adjusts in the range of 70~500N/m.Also include connecting Including when knot is by sucking roller, without generating rupture, cracking, fracture in film is linked, connection film can continuously not had Conveyed to problem.
<Comparative example 1>
In addition to comprising the niproll being made of rubber rollers replace sucking roller transport path in by linking film other than, The continuous conveying of connection film is carried out similarly with (C) of embodiment 1, is as a result produced in linking part when linking part passes through niproll Raw fracture.
<Embodiment 2>
Preparation is laminated with the optical film for the hard conating that thickness is 4 μm on the triacetyl cellulose that thickness is 25 μm.For The optical film, by measuring charpy impact strength with same assay method above.As a result, from hard conating side impaction hammer When TD and the impact absorbing energy of MD be respectively 145kJ/m2、138kJ/m2.In addition, from hard conating side opposite side impact hammer The impact absorbing energy of the TD and MD of the period of the day from 11 p.m. to 1 a.m are respectively 186kJ/m2、134kJ/m2.In addition, become convex mode according to hard conating side By optical film finger doubling, as a result optical film fracture.
Other than using the optical film, similarly to Example 1 into the continuous conveying of joining line film.Also include linking part No in film is linked to generate rupture, cracking, fracture including during by sucking roller, can linking film, continuously there is no problem Ground is conveyed.
<Comparative example 2>
In addition to comprising the niproll being made of rubber rollers replace sucking roller transport path in by linking film other than, It is performed in the same manner as in Example 2 and links the continuous conveying of film, as a result generated in linking part when linking part passes through niproll disconnected It splits.
<Reference example 1>
For (methyl) acrylic resin film made in (A) of above-described embodiment 1, pass through measure same as above Method measures charpy impact strength.As a result, from a face of film hit hammer situation and from another face hit In the case of be same as a result, the impact absorbing energy of TD and MD is respectively 228kJ/m2、214kJ/m2.In addition, even if by the film With finger doubling, film is not also broken.
Other than using (methyl) acrylic resin film, the continuous defeated of connection film is carried out similarly with comparative example 1 Send, when as a result also passing through niproll including linking part including, connection film (including linking part.) in without generate rupture, cracking, Fracture.
<Reference example 2>
For the tri acetyl cellulose membrane that thickness is 25 μm, it is strong that Charpy impact is measured by assay method same as above Degree.As a result, from a face of film hit hammer situation and from another face hit in the case of be it is same as a result, The impact absorbing energy of TD and MD is respectively 588kJ/m2、455kJ/m2.In addition, even if by film finger doubling, film does not have yet Fracture.
Other than using the tri acetyl cellulose membrane, the continuous conveying of connection film is carried out similarly with comparative example 1, as a result Including when also passing through niproll including linking part, in connection film (including linking part.) in without generate rupture, cracking, fracture.
<Reference example 3>
For the polyethylene terephthalate film that thickness is 38 μm, the summer is measured by assay method same as above Compare impact strength.As a result, it is same in the case where hitting the situation of hammer from a face of film and being hit from another face Sample as a result, about any one of TD and MD, impact absorbing energy is more than the upper limit (2593kJ/m that can be measured2).This Outside, even if by film finger doubling, film is not also broken.
Other than using the polyethylene terephthalate film, the continuous of connection film is carried out similarly with comparative example 1 Conveying, when as a result also passing through niproll including linking part including, linking film (including linking part.) in without generate rupture, tortoise It splits, be broken.
<Reference example 4>
For the polypropylene screen that thickness is 60 μm, charpy impact strength is measured by assay method same as above.Its As a result, from a face of film hit hammer situation and from another face hit in the case of be it is same as a result, about Any one of TD and MD, impact absorbing energy are more than the upper limit (1642kJ/m that can be measured2).In addition, even if by the film With finger doubling, film is not also broken.
Other than using the polypropylene screen, the continuous conveying of connection film is carried out similarly with comparative example 1, is as a result also included Including when linking part passes through niproll, in connection film (including linking part.) in without generate rupture, cracking, fracture.
The explanation of symbol
10 the 1st films, 20 the 2nd films, 30 connection bands, 40 sucking rollers, 50 withdrawing devices, 60 deflector rolls.

Claims (5)

1. a kind of carrying method is the connection film of the 2nd film that will link comprising the 1st film and with its length direction terminal along packet The method that transport path containing more than one driven roller is continuously conveyed by one above driven roller, In,
Any one of 1st film and the 2nd film are less than 200kJ/m for charpy impact strength2Optical film, another one is Charpy impact strength is 200kJ/m2Above lead film,
One above all sucking rollers of driven roller.
2. carrying method according to claim 1, wherein, at least described 2nd film is the optical film,
The connection film further includes the 3rd film linked with the length direction terminal of the 2nd film.
3. carrying method according to claim 1 or 2, wherein, the optical film is has base material film and is laminated thereon Coat optical film.
4. a kind of manufacturing method of optical film, including following process：
The process for making the 1st optical film to the 2nd optical film；With
By comprising the 1st film and with the connection film of the 2nd film of its length direction terminal connection along including more than one driven roller The process that is continuously conveyed by one above driven roller of transport path,
Any one of 1st film and the 2nd film are less than 200kJ/m for charpy impact strength2The 1st optical film or Charpy impact strength is less than 200kJ/m2The 2nd optical film, another one is that charpy impact strength is 200kJ/m2Above draws Line film,
One above all sucking rollers of driven roller.
5. manufacturing method according to claim 4, wherein, the 2nd optical film is selected from by single layer optical film, multilayer optical The group that film, the optical film of drawn and the optical film with coat form.
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