CN109789614A - Solution film-forming method - Google Patents

Abstract

The present invention provides a kind of solution film-forming method of optical film that manufacture flatness is further enhanced.Solution film-forming equipment manufactures film by rubber cement.The rubber cement of solvent is dissolved in by cast polymer continuous on the conveyer belt of traveling to form casting films, and the dry casting films.Film is formed by stripping casting films from curtain coating supporter.With the state opposed with the curtain coating face that the rubber cement of conveyer belt is cast, it is provided with net.Net is arranged to the state separated with curtain coating face.The diameter of the through hole of net is up to 7mm.

Description

Solution film-forming method

Technical field

The present invention relates to a kind of solution film-forming methods.

Background technique

As the manufacturing method of optical film, there is solution film-forming method.Solution film-forming method is a kind of following method: by making The rubber cement that polymer is dissolved in solvent is cast curtain coating supporter in traveling to form casting films, by by the casting films from curtain coating Supporter is removed to form film, and drying is formed by film.Casting films are solidified into be formed by stripping on curtain coating supporter The state that film can be transmitted.As the method for solidifying casting films on curtain coating supporter, there is the method for dry casting films.

The flatness of the film surface of casting films will affect the state of the film surface of film obtained, therefore propose to be improved casting films Film surface flatness method.Such as the method recorded in Japanese Unexamined Patent Publication 2006-297903 bulletin, pass through the 1st back tender Sequence and the dry casting films of the 2nd drying process.1st drying process will be from will be cast of the width direction of supporter as longitudinal direction Static pressure is adjusted to fixed in the range of 50Pa~200Pa on one side by 1 air outlet, is sent out on one side to newly formed casting films Temperature is set as substantially certain wind in the range of 50 DEG C~160 DEG C.2nd drying process is after the 1st drying process, according to stream Prolong the quantity of solvent that film includes, from the 2nd air outlet of the direction of travel towards curtain coating supporter, sends out to casting films and supported with curtain coating The substantially parallel wind of the direction of travel of body.

In contrast, in view of blowing the uneven drying that wind easily causes casting films, thus, for example in Japanese Unexamined Patent Publication In 2003-103543 bulletin, pass through the cold plate dry casting films that have just been cast opposite disposed with curtain coating supporter.

Summary of the invention

The invention technical task to be solved

The glass of picture display face for mobile terminal is for example easy because of the rupture such as impact.It is therefore desirable to cover glass The film of resin (polymer) system on surface and/or the film that glass is substituted for resin (polymer) system.About this point, pass through day The previous solution film-forming method manufacture such as this special open 2006-297903 bulletin and Japanese Unexamined Patent Publication 2003-103543 bulletin Optical film is in protective film of polarizing film etc. on the way with sufficient flatness.However, the flatness is not as good as with reflecting feel Above-mentioned glass, such as in order to be used as the protective film such as above-mentioned picture display face, need to further increase flatness.

Therefore, the purpose of the present invention is to provide a kind of solution systems of optical film that manufacture flatness is further enhanced Film method.

For solving the means of technical task

In order to solve the above problems, solution film-forming method of the invention has casting films formation process, casting films back tender Sequence and strip process.Casting films formation process is dissolved in solvent by cast polymer continuous on the curtain coating supporter of traveling Rubber cement forms casting films.Casting films drying process dries casting films.Process is stripped by the way that casting films drying process will be passed through Casting films strip to form film from curtain coating supporter.It is formed with porous member and curtain coating branch that diameter is up to the through hole of 7mm The curtain coating face of the rubber cement curtain coating of support body is opposed with isolated state and is arranged.

Porous member is preferably net or porous plate.

The aperture opening ratio in the part side of opening is formed by through hole preferably in 35% or more and 70% or less range.

The distance between supporter and porous member are cast preferably in the range of 5mm or more and 50mm or less.

Casting films drying process preferably passes through the drying device for being arranged to the state opposed with the curtain coating curtain coating face of supporter Dry casting films.Porous member preferred disposition is between the casting position and drying device that rubber cement is cast.

Porous member is preferably disposed on wind speed in the state of stopping the traveling for being cast supporter and is being greater than 0m/s and 1m/ Region in the range of s or less.

It is preferred that blocking the wind flowed between curtain coating supporter and porous member, the component configuration of keeping out the wind by the component that keeps out the wind At the state opposite with the ora terminalis of porous member and with than porous member more to curtain coating supporter side state outstanding.

The component that keeps out the wind is the wind deflector extended along the width direction orthogonal with the curtain coating direction of travel of supporter, and is kept out the wind Plate is arranged on the downstream of the porous member on the direction of travel of curtain coating supporter preferably with the state separated with curtain coating supporter Side.The distance between wind deflector and curtain coating supporter are preferably in the range of 1mm or more and 50mm or less.

The component that keeps out the wind be along curtain coating supporter direction of travel extend the wall that keeps out the wind, and keep out the wind wall preferably with curtain coating branch The state of support body separation is arranged on the two sides of the porous member in the width direction orthogonal with the curtain coating direction of travel of supporter. The distance between wall and curtain coating supporter keep out the wind preferably in the range of 1mm or more and 50mm or less.

The component that keeps out the wind is preferably provided to the state contacted with porous member.

Invention effect

In accordance with the invention it is possible to manufacture the optical film that flatness is further enhanced.

Detailed description of the invention

Fig. 1 is the skeleton diagram of solution film-forming equipment.

Fig. 2 is the schematic diagram of net.

Fig. 3 is the explanatory diagram of aperture opening ratio.

Fig. 4 is the skeleton diagram for being cast the casting device that supporter is roller.

Fig. 5 is the skeleton diagram for being provided with the casting device for the component that keeps out the wind.

Fig. 6 is along Fig. 5 (VI)-(VI) line partial cutaway view.

Fig. 7 is the skeleton diagram for being provided with the casting device for the component that keeps out the wind.

Fig. 8 is along Fig. 7 (VIII)-(VIII) line partial cutaway view.

Fig. 9 A be provided with auxiliary wind deflector casting device skeleton diagram, (A) be wind deflector, keep out the wind wall and auxiliary keep out the wind The plane skeleton diagram of plate, (B) are the skeleton diagrams of the side of casting device.

Fig. 9 B is the side skeleton diagram for being provided with the casting device of auxiliary wind deflector.

Figure 10 is the skeleton diagram for being provided with the casting device for the wall that assists keeping out the wind, and (A) is the skeleton diagram of the side of casting device, (B) be indicate to keep out the wind wall and auxiliary keep out the wind wall width direction Y position plane skeleton diagram.

Figure 11 is the skeleton diagram for being provided with the casting device for the wall that assists keeping out the wind, and (A) is the skeleton diagram of the side of casting device, (B) be indicate to keep out the wind wall and auxiliary keep out the wind wall width direction Y position plane skeleton diagram.

Figure 12 is the explanatory diagram of the evaluation method of flatness.

Specific embodiment

[the 1st embodiment]

Implement solution film-forming equipment 10 shown in FIG. 1 of the invention for manufacturing optical film (hreinafter referred to as " film ") 11. The film 11 constitutes the picture display face of mobile terminal, that is, is used as the most surface as the touch panel for being configured at image displaying part Protective film.The film 11 substitutes previous glass, can be used as substitute, can also be made with the state for being attached to glass surface With.The thickness of manufactured film 11 is in 10 μm or more and 300 μm or less of range, preferably at 100 μm or more and 300 μm or less In the range of, further preferably in 150 μm or more and 250 μm or less of range.It is set as 200 μm in the present embodiment.

Solution film-forming equipment 10 successively has casting device 13, stenter 14, roller drying device 15, cutting machine from upstream side 16, devices for taking-up 17.In addition, in the present specification, solvent containing ratio (unit；It is %) value of dry basis, specifically It is that the quality of solvent is set as MS, solvent containing ratio is acquired into the film 11 of object or when the quality of casting films 29 is set as MF, with { MS/ (MF-MS) } × 100 percentage acquired.

Casting device 13 is the device for forming film 11 from rubber cement 21.Rubber cement 21 is the polymerization that polymer is dissolved in solvent Object solution.In the present embodiment, it as polymer, using cellulose triacetate (hereinafter referred to as TAC), but also can be used Other cellulose acylates different from TAC.The acyl group of cellulose acylate can be only a kind, or also can have 2 kinds with On acyl group.When acyl group is two or more, one is acetyl group preferably wherein.By the ratio of the hydroxyl carboxylic esterification of cellulose, That is the degree of substitution of acyl group preferably satisfies all following formula (I)s~(III).In addition, in formula below (I)~(III), A and B table Show the degree of substitution of acyl group, A is the degree of substitution of acetyl group, and B is the degree of substitution of the acyl group of carbon atom number 3~22.

(I)2.0≤A+B≤3.0

(II)1.0≤A≤3.0

(III)0≤B≤2.0

The full degree of substitution A+B of acyl group is more preferably 2.20 or more and 2.90 hereinafter, especially preferably 2.40 or more and 2.88 Below.Also, the degree of substitution B of the acyl group of carbon atom number 3~22 is more preferably 0.30 or more, especially preferably 0.5 or more.

Also, the polymer of rubber cement 21 is not limited to cellulose acylate.Such as or acrylic resin, cyclic annular alkene Hydrocarbon resin (such as ARTON (registered trademark) of JSR Corporation) etc..

As the solid component for becoming film 11, rubber cement 21 may include ingredient in addition to polymers.As except polymer Solid component in addition, such as have plasticizer, ultraviolet absorbing agent, delay controlling agent, particulate etc., it wraps in the present embodiment Plasticizer-containing.Particulate is the mesh of adhesion to assign lubricity and/or Marresistance to film 11, or when inhibiting overlapped film 11 etc. And the so-called delustering agent that uses.

As the solvent of rubber cement 21, the mixture of methylene chloride and methanol is used in the present embodiment.Solvent is simultaneously unlimited In the example of present embodiment, such as using butanol, ethyl alcohol, propyl alcohol etc., these can be used as mixture and are used in combination of two or more.

Casting device 13, which has, is formed as cricoid continuous curtain coating supporter i.e. conveyer belt 23 and the circumferentially rotatable the 1st Roller 26 and the 2nd roller 27.Circumferential surface of the conveyer belt 23 wound on the 1st roller 26 and the 2nd roller 27.At least one in 1st roller 26 and the 2nd roller 27 A is the driven roller with driving mechanism.Circumferentially rotatable by driven roller, the conveyer belt 23 with all face contacts is in long side It is continuously traveling, and is recycled on direction.In addition, the arrow for being labeled with symbol X in Fig. 1 indicates the direction of travel of conveyer belt 23 And the direction of transfer of film 11.In addition, curtain coating supporter is not limited to conveyer belt 23, roller also can be used (with reference to Fig. 4, Fig. 5).

Has curtain coating mould (hereinafter referred to as mould) 28 in the top of conveyer belt 23.Mould 28 by the rubber cement 21 supplied widen for To the paper depth direction of Fig. 1 extend it is membranaceous after, flowed continually out from outflux (not shown).As a result, in the transmission of traveling Casting films 29 are formed on band 23.In addition, the position for being below cast rubber cement 21 on the traveling road of conveyer belt 23, i.e. rubber cement 21 with The position of 23 contact start of conveyer belt is known as casting position, and label symbol PC.

In the present embodiment, mould 28 is set to the top of the conveyer belt 23 on the 1st roller 26, casting position PC is located at On 1st roller 26.However, the position of mould 28 is not limited to this.For example, can be set in the transmission from the 1st roller 26 towards the 2nd roller 27 With 23 top, thus rubber cement 21 can be made to be cast on the conveyer belt 23 from the 1st roller 26 towards the 2nd roller 27.At this point, it is preferred that from The lower section of 1st roller 26 towards the conveyer belt 23 of the 2nd roller 27 configures roller 31, and configures in the top of the conveyer belt 23 supported by roller 31 Mould 28.

1st roller 26 and the 2nd roller 27 have the temperature controller (not shown) of the temperature of control circumferential surface respectively.1st roller 26 Circumferential surface is cooled to temperature as defined range, and thus every advance one week of conveyer belt 23 is once cooled down.Thus inhibit stream Prolong the blistering of film 29.The circumferential surface of 2nd roller 27 is heated to temperature as defined range, thus more effectively dries casting films 29。

For the circumferential surface temperature of 1st roller 26 preferably in 0 DEG C or more and 40 DEG C of ranges below, the circumferential surface temperature of the 2nd roller 27 is preferred In 15 DEG C or more and 80 DEG C of ranges below.

About the rubber cement 21 for reaching conveyer belt 23 from mould 28, so-called runner can also be on the direction of travel of conveyer belt 23 Upstream be arranged relief chamber (not shown).Relief chamber carries out the region by the environmental gas of the upstream side region of suction runner Decompression.

After the dry degree that can be extremely transmitted to stenter 14 of casting films 29, to wrap solvent-laden state from conveyer belt 23 removings, are consequently formed film 11.Strip preferably solvent containing ratio become 100% or less after carry out, more preferably 25% with It is carried out in upper and 70% or less range.

When stripping, using 33 support membrane 11 of roller (hereinafter referred to as angle stripper) as the portion that strips, and by casting films 29 from biography The position PP that strips for sending band 23 to remove is kept fixed.Angle stripper 33 can be to have driving mechanism and circumferentially rotatable driving Roller.It is carried out in addition, stripping using the conveyer belt 23 on the 1st roller 26.Conveyer belt 23 is recycled and returns to stream from position PP is stripped Prolong position PC, and is cast new rubber cement 21 again in casting position PC.

Casting device 13 has gas supply drying unit 41 and the net 42 as porous member.Gas supply drying unit 41 be make by Casting films 29 it is dry to be able to carry out from conveyer belt 23 strip after transmission degree casting films drying device.Gas supply is dry single The position of mould 28 more downstream on the direction of travel than conveyer belt 23 is arranged in member 41, and there is the 1st gas supply part the 45~the 3rd to supply Gas portion 47 and the 1st exhaust portion 48, the 2nd exhaust portion 49.The curtain coating face 23a that they configured in the casting films 29 for forming conveyer belt 23 Side is arranged in sequence with the 1st gas supply part 45, the 1st exhaust portion 48, the 2nd gas supply part along the direction of travel of conveyer belt 23, and from upstream side 46, the 2nd exhaust portion 49, the 3rd gas supply part 47.

In this example embodiment, by the configuration of the 1st gas supply part 45 near the traveling road of the conveyer belt 23 on the 1st roller 26, the 1st exhaust Portion 48 and the configuration of the 2nd gas supply part 46 are near from the 1st roller 26 towards the traveling road of the conveyer belt 23 of the 2nd roller 27, the 2nd exhaust portion 49 Configuration near the traveling road of the conveyer belt 23 contact with the 2nd roller 27, the 3rd gas supply part 47 configure with 26 contact start of the 1st roller Position near conveyer belt 23 traveling road near.Wherein, the 45~the 3rd gas supply part 47 of the 1st gas supply part and the 1st exhaust portion are configured 48, the position of the 2nd exhaust portion 49 is not limited to this, as long as from casting position PC towards the row for the conveyer belt 23 for stripping position PP Route is nearby.Also, the quantity of gas supply part and exhaust portion is also not limited to this, is set as corresponding to the length of conveyer belt 23 etc. Quantity.

The 45~the 3rd gas supply part 47 of 1st gas supply part flows out the dry gas being heated, the 1st exhaust portion 48 and the 2nd exhaust portion 49 Intake-gas is simultaneously vented.Here, conveyer belt 23, mould 28, the 45~the 3rd gas supply part 47 of the 1st gas supply part, the 1st exhaust portion 48, the 2nd row Gas portion 49 etc. is housed in the inside with the chamber 51 of exterior space partition, the gas that the 1st exhaust portion 48 and the 2nd exhaust portion 49 will be aspirated Body is expelled to the outside of the chamber 51.It supplies drying unit 41 and has air blowing control device 52 in the outside of chamber 51.Air blowing control device 52 Have a fan (not shown) and control unit (not shown), control unit through fan by such as air as dry gas send respectively to The 45~the 3rd gas supply part 47 of 1st gas supply part, and by the temperature and humidity of the gas and come from the 45~the 3rd gas supply part 47 of the 1st gas supply part Each flow, the 1st exhaust portion 48 and the respective gas suction force of the 2nd exhaust portion 49 be separately adjusted.

In the present embodiment, the dry gas from the 45~the 3rd gas supply part 47 of the 1st gas supply part passes through air blowing control device 52 It is heated to about 90 DEG C.Flow the dry gas so heated in casting films 29 as warm wind, to heat casting films 29 And promote drying.The temperature of dry gas is preferably in 40 DEG C or more and 140 DEG C or less of range.

It is (not shown) towards biography that 1st gas supply part 45 and the 2nd gas supply part 46 are configured to the outflux for flowing out dry gas Send the state of the direction of travel X of band 23, thus with down wind transmit in casting films 29 supply dry gas.The dry gas at For the fluid parallel with the film surface of casting films 29.The outflux that 3rd gas supply part 47 is configured to flow out dry gas (is not schemed Show) towards the state with the direction of travel X opposite side of conveyer belt 23, it is thus dry with the supply of casting films 29 in upwind transmission Pathogenic dryness body.The dry gas also becomes the fluid parallel with the film surface of casting films 29.By the 1st exhaust portion 48 and the 2nd exhaust portion 49 It is configured to the pump orifice state (not shown) towards the casting films 29 passed through of intake-gas.1st exhaust portion 48 is in the 1st gas supply Between portion 45 and the 2nd gas supply part 46, the 2nd exhaust portion 49 is between the 2nd gas supply part 46 and the 3rd gas supply part 47, difference intake-gas. Wherein, the direction of the dry gas supplied is not limited to this, and can be the direction vertical with casting films 29.In addition, the 1st is supplied The pump orifice of gas portion 45~the 3rd gas supply part 47 outflux, the 1st exhaust portion 48 and the 2nd exhaust portion 49 is set as along conveyer belt 23 The opening for the slit-shaped that width direction (the paper depth direction of Fig. 1) extends.

In the present embodiment, the 45~the 3rd gas supply part of the 1st gas supply part is separately controlled by air blowing control device 52 47, the 1st exhaust portion 48 and the 2nd exhaust portion 49, but it is not limited to which.For example, can be respectively in the 1st gas supply part the 45~the 3rd Gas supply part 47, the 1st exhaust portion 48 and the 2nd exhaust portion 49 setting controller (not shown), and pass through the 1st gas supply of each controller control Portion 45~the 3rd gas supply part 47, the 1st exhaust portion 48 and the 2nd exhaust portion 49.The case where changing the quantity of gas supply part and exhaust portion also phase Together.

The casting films drying device of dry casting films 29 is not limited to gas supply drying unit 41, and dry casting films can be used Well known drying device.Such as can be have be formed as cover casting films 29 size box-like feeding tank and be set to The pressure fan of the multiple submitting nozzles for sending out dry gas from the opening of front end of the opposed faces of the conveyer belt 23 of the feeding tank. Also, for example, can be the freezing machine of the size of covering casting films 29.As freezing machine, such as there is Japanese Unexamined Patent Publication 2003- The cold plate recorded in No. 103543 bulletins, the cold plate carry out the solvent for becoming gas from the evaporation of casting films 29 by cooling Thus condensation promotes the drying of casting films 29.

However, as it is known that being produced existing in casting films 29 because of solvent (the referred to as solvent gas) evaporated from casting films 29 Raw boundary layer.The boundary layer is the higher region of solvent gas concentration in the environmental gas of casting films 29, The solvent containing ratio of casting films 29 is higher, and the thickness in boundary layer is thicker.The convection current of solvent gas can be generated in boundary layer, this is right Stream is considered as the fluctuation of the solvent gas concentration in boundary layer.Net 42 inhibits the convection current in the boundary layer and for promoting stream Prolong the drying of film 29.

Net 42 is perforative hole in a thickness direction, that is, is formed through an example of the porous member in hole 70 (with reference to Fig. 2). Net 42 is opposed with the curtain coating face 23a of conveyer belt 23, and is arranged to the state separated with curtain coating face 23a.Will net 42 be arranged to The state of curtain coating face 23a separation, and the transmission path of casting films 29 becomes the state covered by net 42.It is formed in casting position PC's Casting films 29 pass through the transmission path that is covered by the net 42.The diameter d70 (referring to Fig. 3) of through hole 70 is up to 7mm.

Here, curtain coating the distance between supporter and net 42 are set as D.In this example embodiment, curtain coating supporter is conveyer belt 23, therefore distance D is the distance between conveyer belt 23 and net 42.Distance D preferably in the range of 5mm or more and 50mm or less, More preferably in the range of 10mm or more and 30mm or less, further preferably in the range of 15mm or more and 25mm or less.Separately Outside, the distance between conveyer belt 23 and net 42 D be conveyer belt 23 curtain coating face 23a with it is net 42 and that conveyer belt 23 is opposed opposed The distance between face 42a (referring to Fig. 2).

Net 42 is the component as the casting films drying device independently of dry casting films 19 and the component being arranged.I.e. at this In example, net 42 becomes the component independently of gas supply drying unit 41.Also, using from different above-mentioned of gas supply drying unit 41 When well known drying device, independently of the drying device component and net 42 is set.For example, being formed as covering casting films in use When the above-mentioned feeding tank of the box-like of 29 size, even if being provided with the porous members such as net in the front end for sending out nozzle, can also it make For the component independently of the feeding tank with the porous member, net 42 is set.Also, even if making as above-mentioned condensing unit It, also can be as independently of this when with any one in the porous plate and net recorded in such as Japanese Unexamined Patent Publication 2003-103543 bulletin A little components is arranged net 42.

Net 42 is preferably disposed between casting position PC and gas supply drying unit 41.In gas supply drying unit 41, passing Sending on the direction of travel of band 23 positioned at the upstream side nearest from casting position PC is the 1st gas supply part 45, therefore in this example, edge The traveling road of conveyer belt 23 until from casting position PC to the 1st gas supply part 45 is configured with net 42.

Net 42 can be set in from casting position PC to the whole region for stripping position PP, can not be set to whole region When, net 42 is preferably disposed on wind speed and is being greater than 0m/s and 1m/s model below in the state of stopping the traveling of conveyer belt 23 The transmission path in the region in enclosing.Specifically, being not provided with the state of net 42 and stopping the traveling of conveyer belt 23, and make to supply In the state that drying unit 41 is run, the wind speed of the transmission path of casting films 29 is measured, and determines that wind speed is being greater than 0m/s and 1m/s Gentle breeze region in following range.In the gentle breeze region, net 42 is arranged to the shape separated with the curtain coating face 23a of conveyer belt 23 State.In this example, will be determined as from section of the casting position PC until between the 1st exhaust portion 48 and the 2nd gas supply part 46 above-mentioned Gentle breeze region, therefore the section is provided with net 42.

The film 11 formed by stripping from conveyer belt 23 is directed to stenter 14.It can be in casting device 13 and tentering Air supply device (not shown) is configured in transmission path between machine 14.Promote the drying of film 11 by the air-supply of the air supply device.

Stenter 14 is to transmit film 11 and promote the 1st dry film drying device.The stenter 14 of present embodiment is logical Each end for keeping film 11 as the fixture 14a of holding member is crossed, and film 11 is transmitted along the long side direction and assigns width side Upward tension, to also carry out the extension for extending film 11 in the width direction processing.

There is stenter 14 pipeline 14b, pipeline 14b the top of the transmission path of film 11 is arranged in.Pipeline 14b has multiple send The slit (not shown) of dry gas (such as dry air) out, dry gas is by pressure fan supply (not shown).Pressure fan The dry gas of temperature and/or humidity as defined in being adjusted to is sent to pipeline 14b.Pipeline 14b is configured to slit and film 11 The opposed state of transmission path.Each slit is the shape extended along the width direction of film 11, and multiple slits are formed as in direction of transfer X On mutually have defined interval.Furthermore it is possible to by the lower section for the transmission path that film 11 is arranged in mutually isostructural pipeline, This two side above and below the transmission path of film 11 can be set.

Roller drying device 15 is the 2nd drying device for further making film 11 dry.The inside of roller drying device 15 Temperature and/or humidity of environmental gas etc. is adjusted by air-conditioning (not shown).In roller drying device 15, film 11 is wound It is transmitted in multiple roller 15a.

Cutting machine 16 is the equipment that film 11 is set as target width for cutting off the both sides of film 11.In the excision, Cut off the both sides comprising the holding trace based on fixture 14a of film 11.Cutting machine 16 can be set dry in stenter 14 and roller Between dry device 15.Devices for taking-up 17 is by being set as scroll-like in core for film volume 11.

As shown in Fig. 2, net 42 is formed as multiple 1st filaments 71 that will extend along the 1st direction and along orthogonal with the 1st direction The 2nd direction extend multiple 2nd filaments 72 braiding plain weave textile-like.1st filament 71 and the 2nd filament 72 are with right The solvent composition of rubber cement 21 has indefatigable material and is formed, and in this case, it is made of metal.By the 1st filament 71 and the 2nd filament 72 through holes 70 surrounded are respectively in the opposed faces 42a and and opposed faces as the part side opposed with the conveyer belt 23 of net 42 The part side of 42a opposite side, that is, anti-opposed faces 42b is formed with opening.

It is such as above-mentioned, the net 42 of this is set as to the textile-like of plain weave, but be not limited to plain weave, or twill weave etc. Other textile-likes.Also, net is not limited to textile-like, or knitted fabric shape.As above-mentioned, net 42 is the one of porous member , as porous member, can be porous plate (punched-plate).

1st filament 71 and the 2nd filament 72 are mutually indepedent, but such as can be by becoming one the melting based on heating Body.Also, the angle of the crossing of the 1st filament 71 and the 2nd filament 72 is not limited to 90 °.In this example embodiment, the 1st adjacent filament The distance between 71 are set as fixed, and adjacent the distance between the 2nd filament 72 is similarly set as fixed.Wherein, may be used To be unevenly arranged in the distance between the distance between the 1st adjacent filament 71 and the 2nd adjacent filament 72 extremely It is one few.

The above-mentioned diameter d70 of through hole 70 is full-size.As shown in figure 3, the through hole 70 of this is square, therefore Cornerwise length is set as to the diameter d70 of through hole 70.Such as through hole 70 is in opposed faces 42a and anti-opposed faces 42b When oval, the length of long axis is set as diameter d70.

Each aperture opening ratio in opposed faces 42a and anti-opposed faces 42b is preferably in 35% or more and 70% or less range, more It is preferred that in 40% or more and 60% or less range, further preferably in 45% or more and 55% or less range.It is opposed Aperture opening ratio (unit %) in the 42a of face is acquired with the following method.From vertical direction when opposed faces 42a, by per unit The area of through hole 70 in 42a is set as S1, and the area of the 1st filament 71 and the 2nd filament 72 is set as S2 by area. The area S1 of through hole 70 is the area of the part indicated with the cross-hatched in Fig. 3.Area S2 is the shade indicated with oblique line The area of line part.Above-mentioned aperture opening ratio is acquired with { S1/ (S1+S2) } × 100.Similarly acquire opening in anti-opposed faces 42b Mouth rate.

The effect of above structure is illustrated.Rubber cement 21 is flowed continually out from mould 28 to the conveyer belt 23 of traveling, thus Casting films 29 (casting films formation process) is formed on conveyer belt 23.Casting films 29 are transmitted by the conveyer belt 23 of traveling, and are guided To gas supply drying unit 41.By the gas supply from the 45~the 3rd gas supply part 47 of the 1st gas supply part, promote the drying (stream of casting films 29 Prolong film drying process).1st exhaust portion 48 and the 2nd exhaust portion 49 are configured to the pump orifice of intake-gas towards casting films 29 State, therefore more reliably flowed in casting films 29 from the dry gas that the 45~the 3rd gas supply part 47 of the 1st gas supply part flows out.Cause This, more effectively promotes the drying of casting films 29.

There are net 42 in the transmission path of casting films 29, the diameter d70 maximum that will pass through hole 70 is set as 7mm, therefore boundary The convection current of layer is inhibited and stable concave surface.As a result, with the film surface of very smooth state transmission casting films 29, as a result, The film 11 that flatness is significantly improved can be obtained.When the diameter of through hole 70 is greater than 7mm, because from gas supply drying unit 41 The influence of the gas supply of (being in this embodiment the 1st gas supply part 45), when the flatness ratio 7mm of film 11 obtained diameter below more Difference.Also, since there are through holes 70, by from gas supply drying unit 41 (being in this embodiment the 1st gas supply part 45) The function of supplying dry casting films 29 is maintained, to reliably promote the drying of casting films 29.

It is 35% or more by each aperture opening ratio in opposed faces 42a and anti-opposed faces 42b, phase the case where with less than 35% Than more reliably promoting to dry curtain coating by the gas supply from gas supply drying unit 41 (being in this embodiment the 1st gas supply part 45) Film 29.By each aperture opening ratio in opposed faces 42a and anti-opposed faces 42b in the range below 70%, with the feelings for being greater than 70% Condition is compared, and more reliably inhibition is generated because coming from the gas supply of gas supply drying unit 41 (being in this embodiment the 1st gas supply part 45) The variation of the film surface of casting films 29.

It is that 5mm or more is more reliably kept away compared with the case where being less than 5mm by the distance between conveyer belt 23 and net 42 D Exempt from advance conveyer belt 23 contact, and more reliably inhibit casting films 29 film surface variation, so as to more reliably Obtain the film 11 that flatness is improved.Also, by distance D be 50mm hereinafter, be greater than 50mm the case where compared with, it is more reliable Ground inhibits the variation of the film surface of casting films 29.

From casting position PC to the section for supplying the casting films 29 between drying unit 41 for transmission after newly formed, therefore In the transmission path of casting films 29, become the most transmission path of the amount of evaporated solvent.Therefore, which, which becomes, is formed by side The big section of the convection current of interlayer.As above-mentioned, in this example, by net 42 be set to casting position PC and gas supply drying unit 41 it Between, therefore more reliably inhibit the variation of the film surface of the casting films 29 generated by boundary layer.

Above-mentioned gentle breeze region has the tendency that the convection current for being formed by boundary layer is big, and net 42 is set to the gentle breeze region, because This more reliably inhibits the variation of the film surface of the casting films 29 generated by boundary layer.

The film stripped from conveyer belt 23 and (strip process) to be formed is transported through casting films 29 by stenter 14 on one side 11, drying is promoted by the dry wind from pipeline 14b on one side, and extend in the width direction by fixture 14a.Film 11 passes through Roller drying device 15 is further dried.In this way, passing through 15 desciccator diaphragm 11 (film drying process) of stenter 14 and roller drying device. After removing side using cutting machine 16, it is rolled by devices for taking-up 17 scroll-like.

[the 2nd embodiment]

In the 2nd embodiment, roller is used as curtain coating supporter.Hereinafter, being said with reference to Fig. 4 to the 2nd embodiment It is bright.In the 2nd embodiment, roller 123 is used instead of conveyer belt 23, and replaces gas supply drying unit 41 dry single using gas supply Member 141 is identical as the 1st embodiment in addition to this.In Fig. 4, the component etc. for marking symbol identical with FIG. 1 to FIG. 3 such as exists Explanation in 1st embodiment, and the description is omitted.

Casting device 113 has the mould 28 of discharge rubber cement 21, is configured at the lower section of mould 28 and is cast rubber cement in circumferential surface 123a 21 roller 123.It is connected in roller 123 driving device (not shown), controller (not shown) is connected in driving device.Rolling Driving device of the cylinder 123 by being controlled by controller, rotates driving centered on rotary shaft 123b.Roller 123 as a result, Circumferential surface 123a is rotated along defined direction with fixing speed.Circumferential surface 123a is functioned as curtain coating face.Therefore, at this In example, the direction of rotation of the circumferential surface 123a of roller 123 is set as to the direction of travel X of curtain coating supporter.It can be in the row of mould 28 Into the upstream on the X of direction, relief chamber (not shown) is set.

By in the chamber 51 of casting device 113 and roller 123 be set as casting films 29 cool and solidify (gelation) temperature.? The inside of roller 123 is formed with the flow path of heat-conducting medium, and thermally conductive Jie of defined temperature is set as by temperature controller (not shown) Matter passes through the flow path.In this way, the temperature of circumferential surface 123a is maintained at defined value by temperature controller.From easily operated and easy From the viewpoint of controlling temperature, compared to gas, heat-conducting medium is more preferably liquid.The temperature of circumferential surface 123a is according to rubber cement 21 The type of solvent, the type of solid component, the concentration of solid component in rubber cement 21, suitably set to time for stripping position etc. It is fixed.The temperature of circumferential surface 123a preferably remains in -10 DEG C or more and 10 DEG C or less.As defined in the temperature in chamber 51 is maintained at Value is arranged register (not shown).Temperature in chamber 51 is according to the temperature of the rubber cement 21 when being cast and the temperature of circumferential surface 123a It suitably sets.

Gas supply drying unit 141 has the 2nd gas supply part 46, the 2nd exhaust portion 49 and the 3rd gas supply part 47.They are configured at Near circumferential surface 123a, along direction of travel X, the 2nd gas supply part 46, the 2nd exhaust portion 49, the 3rd gas supply part are arranged successively from upstream side 47。

In this example embodiment, the 2nd gas supply part 46 is configured near the downstream side of ora terminalis 42e (with reference to Fig. 5) of net 42, and the 3rd supplies Gas portion 47 is configured at the upstream vicinity for stripping position PP, and the 2nd exhaust portion 49 is then configured at the 2nd gas supply part 46 and the 3rd gas supply part 47 Between approximately mid way between.In addition, as shown in figure 5, above-mentioned ora terminalis 42e is the downstream side of the net 42 on direction of travel X Edge.Wherein, configure the 2nd gas supply part 46, the position of the 3rd gas supply part 47 and the 2nd exhaust portion 49 is not limited to this, as long as from curtain coating PC direction in position strips near the circumferential surface 123a of position PP.Also, the quantity of gas supply part and exhaust portion is also not limited to This, is set as quantity corresponding with the length of circumferential surface 123a etc..

2nd gas supply part 46 and the 3rd gas supply part 47 flow out the dry gas being heated, and 49 intake-gas of the 2nd exhaust portion is side by side Gas.Here, roller 123, mould 28, the 2nd gas supply part 46 and the 3rd gas supply part 47, the 2nd exhaust portion 49 etc. be housed in and exterior space every The gas aspirated is expelled to the outside of the chamber 51 by the inside of disconnected chamber 51, the 2nd exhaust portion 49.Gas supply drying unit 141 exists The outside of chamber 51 has air blowing control device 52.

Net 42 is preferably disposed between casting position PC and gas supply drying unit 141.In gas supply drying unit 141, Be located at the upstream side nearest from casting position PC on direction of travel X is the 2nd gas supply part 46, therefore in this example, net 42 is matched It is set to the state opposed with the circumferential surface 123a until from casting position PC to the 2nd gas supply part 46.Net 42 has curved along circumferential surface 131a Bent shape, and the state setting to be separated with circumferential surface 131a.In the width direction of the circumferential surface 123a orthogonal with direction of travel X On (the paper depth direction of Fig. 4), net 42 is bigger than the width of casting films 29.That is, net 42 in the width direction, is cast with covering The mode of the width entirety of film 29 is arranged.In addition, to the width direction label symbol Y (refer to Fig. 6) orthogonal with direction of travel X.

In the present embodiment, curtain coating supporter is roller 123, and distance D is the distance between roller 123 and net 42.? In this example, distance D is preferably in the range of 5mm or more and 50mm or less, more preferably in 10mm or more and 30mm range below It is interior, further preferably in the range of 15mm or more and 25mm or less.In addition, the distance between roller 123 and net 42 D are circumferential surface The distance between 123a and the opposed faces 42a opposed with the roller 123 of net 42 (referring to Fig. 2).

By gas supply from gas supply the 2nd gas supply part 46 of drying unit 141, the 2nd exhaust portion 49 and the 3rd gas supply part 47 or Exhaust promotes the drying of casting films 29.

After casting films 29 are cured to the degree that can be transmitted stenter 14, followed while being supported with angle stripper 33 Roller 123 strips casting films 29.The casting films 29 stripped from roller 123 become film 11, and are for example guided by guide roll to tentering Machine 14.

It can replace stenter 14, use and have multiple stenters as the needle plate (not shown) of holding member and (do not scheme Show).Each needle plate has multiple needles, film 11 is kept by the way that this to be needled into the side of film 11, and by with the statusline of holding Come in transmit film 11.In addition, at this point it is possible to by the stenter 14 to transmit film 11 with the state of the both sides of fixture holding film 11 It is appropriately arranged in having between the above-mentioned stenter of needle plate and cutting machine 16.

By the film 11 sent out from stenter 14 guidance to cutting machine 16, and continuously, cutting removes its both sides.In addition, In present embodiment, such so-called trimming process is implemented between stenter 14 and roller drying device 15, but also can replace This or in addition to this, also implement between roller drying device 15 and devices for taking-up 17.

From casting position PC to supplying between drying unit 141, in no net 42 as the convection current for being formed by boundary layer Big section, but due to being provided with net 42 between casting position PC and gas supply drying unit 141, even if by roller 123 As curtain coating supporter, also inhibit the convection current in boundary layer in a same manner as in the first embodiment, as a result, more reliably inhibiting curtain coating The variation of the film surface of film 29.

[the 3rd embodiment]

With reference to Fig. 5 and Fig. 6, the 3rd embodiment is illustrated.3rd embodiment of the invention is in the 2nd embodiment In be provided with the mode of the component that keeps out the wind.In addition to being provided with and keeping out the wind component, the 3rd embodiment is identical as the 2nd embodiment, is scheming In 5 and Fig. 6, mark and the component of FIG. 1 to FIG. 4 the same symbol etc. such as illustrate that and the description is omitted in the 2nd embodiment.

By the component that keeps out the wind be configured to the state opposite with ora terminalis 42c, 42d, 42e, 42f of net 42 and with than net 42 more to rolling 123 sides of cylinder state outstanding.In addition, as shown in fig. 6, the ora terminalis that ora terminalis 42c and ora terminalis 42d is the net 42 on width direction Y is Side edge.Also, as shown in figure 5, ora terminalis 42f is the upstream side ora terminalis of the net 42 on direction of travel X.The component that keeps out the wind is for keeping off Firmly flow into the component of the wind in (hereinafter referred to as gap) 90 between curtain coating supporter (being in this embodiment roller 123) and net 42.Such as figure Shown in 5 and Fig. 6, in the present embodiment, the wind deflector 81 of Y extension in the width direction is used as the component that keeps out the wind and along traveling side Keep out the wind wall 82L, the 82R extended to X.In addition, as shown in fig. 6, the wall that keeps out the wind on the left of when the wall 82L that keeps out the wind is towards direction of travel X, The wall 82R that keeps out the wind is the wall that keeps out the wind on right side.The generally rectangular plate-shaped member that wind deflector 81 is extended with Y in the width direction relative to The setting of circumferential surface 123a erect posture, keep out the wind wall 82 with the generally rectangular plate-shaped member that extends along direction of travel X relative to The wall-like of circumferential surface 123a erect posture is arranged.

Y extends wind deflector 81 in the width direction, and is arranged on direction of travel X with the state isolated with roller 123 The downstream side of net 42.About wind deflector 81, by its constriction with the opening in the downstream side on the direction of travel X of seal clearance 90 (with Under, the referred to as the 1st opening), and be configured to the ora terminalis 42e of net 42 to opposed state and with than net 42 more to 123 pleurapophysis of roller State out, to block the wind for flowing into gap 90.Similarly, keep out the wind wall 82L and keep out the wind wall 82R along direction of travel X extend and The two sides of the net 42 on width direction Y are arranged on the state isolated with roller 123.In addition, in Fig. 5, in order to avoid attached The complication of figure, the wall 82L not shown that keeps out the wind.About the wall 82L and 82R of keeping out the wind, with the opening on the width direction Y of closing gap 90 The mode of (the hereinafter referred to as the 2nd opening), is each configured to the state opposite with the ora terminalis 42c and 42d of net 42 and with more than net 42 To 123 side of roller state outstanding, to block the wind for flowing into gap 90.

In Fig. 6, direction of travel X is paper nearby direction.Therefore, there is net on the paper inboard direction of wind deflector 81 42.Mould 28 in Fig. 6, in order to avoid the complication of attached drawing, on the inboard direction of net 42 not shown.Wind deflector 81 is configured to The state opposite with the ora terminalis 42e in the downstream side of net 42 and with than net 42 more to 123 side of roller state outstanding.Pass through as a result, Partially sealed 1st is open and blocks the wind for flowing into gap 90.In the present embodiment, wind deflector 81 becomes than net 42 more to opposite In the top shape outstanding in the vertical direction of circumferential surface 123a.However, as long as wind deflector is in the 1st opening seal clearance 90 Can, therefore only will be configured to than net 42 more to 123 side of roller state outstanding, unlimited orientation is hung down relative to circumferential surface 123a's The projected state of the upward top of histogram.

About net 42, in the ora terminalis 42c and ora terminalis 42d of the two sides on width direction Y, on a left side when towards direction of travel X Side is contacted with the wall 82L that keeps out the wind, and is contacted on right side with the wall 82R that keeps out the wind.In addition, in the following description, when not distinguishing the wall 82L that keeps out the wind With keep out the wind wall 82R when, be recorded as the wall 82 that keeps out the wind.Wall 82 keep out the wind in the 2nd partially sealed gap 90 of opening, blocks inflow rolling as a result, Wind between cylinder 123 and net 42.In the present embodiment, the wall 82 that keeps out the wind becomes than net 42 more to the circumferential surface relative to roller 123 The vertical direction top shape outstanding of 123a.As long as however, keep out the wind wall the 2nd be open seal clearance 90, as long as therefore It is configured to than net 42 more to 123 side of roller state outstanding, vertical direction top of the unlimited orientation relative to circumferential surface 123a Projected state.

Here, the distance between wind deflector and curtain coating supporter are set as D2.In this example embodiment, curtain coating supporter is roller 123, therefore distance D2 is the distance between the lower end surface 81a and circumferential surface 123a of wind deflector 81.Distance D2 preferably in 1mm or more and In the range of 50mm or less, more preferably in the range of 2mm or more and 30mm or less, further preferably in 2mm or more and 10mm In following range.In this example embodiment, distance D2 is, for example, 5mm.

Also, will keep out the wind the distance between wall and curtain coating supporter are set as D3.In this example embodiment, curtain coating supporter is roller 123, thus distance D3 be keep out the wind wall 82L the face 82a and roller 123 opposite with the ora terminalis 42c of net 42 with wall 82L phase of keeping out the wind Pair the distance between face 123c, and for the face 82a and roller 123 opposite with the ora terminalis 42d of net 42 of the wall 82R that keeps out the wind with The wall 82R that keeps out the wind opposite the distance between face 123c.Distance D3 is preferably in the range of 1mm or more and 50mm or less, more preferably In the range of 2mm or more and 30mm or less, further preferably in the range of 2mm or more and 10mm or less.In addition, if distance It can be same distance, or different distance as long as D3 is in the range.

In the present embodiment, net 42 and wind deflector 81 are configured to the state of contact, and by net 42 and kept out the wind wall 82 It is configured to the state of contact.Thereby, it is possible to block the wind for flowing into gap 90, and the net 42 open by top, more inhibit The fluctuation of the solvent in boundary layer and the drying for promoting casting films 29.As the component that keeps out the wind, wind deflector is preferably applied in combination and (is used in combination) 81 with keep out the wind wall 82.Also, net 42 and the component that keeps out the wind may be integrally formed.

The effect of above structure is illustrated.Casting films 29 are transmitted by roller 123, therefore along the circumferential surface of roller 123 123a transmission.Therefore, from roller 123 in shape for, by gas supply part supply dry gas by with the 2nd exhaust portion 49 Exhaust and the traveling of roller 123 influence each other, and not only become the fluid parallel with casting films 29, and it is opposite also to become a part sometimes The wind of vertical direction is equivalent in the film surface of casting films 29.It is equivalent to the wind etc. of vertical direction by this, generates sometimes opposite The contrary wind of casting films 29 in transmission, i.e. back-blowing.Sometimes a part of back-blowing blows into gap 90 and upsets through net 42 Casting films 29 on boundary layer convection current.Moreover, back-blowing is lower than the solvent gas concentration in boundary layer.Therefore, back-blowing It blows into and is just cast and when convection part that the solvent gas concentration that is not dried is relatively high, since solvent gas concentration is poor, meeting The reason big as the fluctuation of solvent gas concentration.Moreover, the fluctuation of solvent gas concentration is bigger, the uneven drying of casting films 29 Also become more serious.Uneven drying becomes the reason of uneven thickness of film 11 etc., and can become the original of the flatness of damage film 11 Cause, therefore not preferably.

There is net 42 in the transmission path of casting films 29, and is provided with the component that keeps out the wind for blocking the wind for flowing into gap 90.Pass through Combinational network 42 and the component that keeps out the wind can more reliably promote the drying of casting films 29 and inhibit in the boundary layer in casting films 29 Convection current, and inhibit the fluctuation of gas concentration.

The component that keeps out the wind is the wind deflector 81 that Y extends in the width direction, and in the end of downstream side of net 42, is arranged to and roller 123 isolated states.It is and small through the distance between wind deflector 81 and roller 123 D2 in the range of 1mm or more 50mm or less Compared in the case where 1mm, more reliably avoid with advance roller 123 contact and be used together with wind deflector 81 and net 42, Thus more reliably inhibit the variation of the film surface of casting films 29, and more reliably obtain the film 11 that flatness is improved.Also, Distance D2 be 50mm hereinafter, thus be greater than 50mm the case where compared with, it is more reliable by being used together with wind deflector 81 and net 42 Ground inhibits the variation of the film surface of casting films 29.

The wall 82 that keeps out the wind extended along direction of travel X is arranged to divide with net 42 in the side ora terminalis 42c and this two sides of the side ora terminalis 42d From state, it is more reliable by keeping out the wind the distance between wall 82 and roller 123 D3 in the range of 1mm or more and 50mm or less Ground inhibits the variation of the film surface of casting films 29, and more reliably obtains the film 11 that flatness is improved.

[the 4th embodiment]

4th embodiment of the invention is that the mode for the component that keeps out the wind is provided in the 1st embodiment.Except further setting It keeps out the wind other than component, the 4th embodiment is identical as the 1st embodiment, identical as Fig. 1~6 about marking in Fig. 7 and Fig. 8 The part of symbol has been carried out explanation, and and the description is omitted.In Fig. 7, in order to avoid the complication of attached drawing, the wall not shown that keeps out the wind 82L and ora terminalis 42c.Also, in fig. 8, in order to avoid the complication of attached drawing, the 2nd gas supply part 46 not shown.In present embodiment In, net 42 is set to gentle breeze region, therefore wind deflector 81, the wall 82L and wall 82R that keeps out the wind that keeps out the wind are also disposed on gentle breeze region.It will gear Aerofoil 81, the wall 82L and wall 82R that keeps out the wind that keeps out the wind are arranged to the state contacted with net 42.Wind deflector 81 is with the ora terminalis 42e phase with net 42 Pair state configuration, and the wall 82L and wall 82R that keeps out the wind that keeps out the wind be each configured to it is opposite with the ora terminalis 42c of net 42 and ora terminalis 42d State.

The component that keeps out the wind is to inhibit the convection current in the boundary layer in casting films 29, and press down for blocking the wind for flowing into gap 90 The component of the fluctuation of gas concentration processed, therefore be preferably set near casting films 29 as far as possible.Therefore, in this example embodiment, keep out the wind Setting position of the wall 82 on width direction Y is set to curtain coating face 23a's in curtain coating face 23a but part without casting films 29 The top at the both ends on width direction Y.

In this example embodiment, curtain coating supporter is conveyer belt 23, therefore distance D2 is lower end surface 81a and the curtain coating face of wind deflector The distance between 23a.Also, in this example embodiment, curtain coating supporter is conveyer belt 23, therefore distance D3 is to keep out the wind under wall 82R The distance between end face 82b and curtain coating face 23a or the distance between the lower end surface 82b and curtain coating face 23a of the wall 82L that keeps out the wind.

The component that keeps out the wind is the wind deflector 81 that Y extends in the width direction, and in the end of downstream side of net 42, is arranged to and transmits With 23 isolated states.Through the distance between wind deflector 81 and conveyer belt 23 D2 in the range of 1mm or more and 50mm or less, Compared with the case where being less than 1mm, more reliably avoid with the contact of the conveyer belt 23 of traveling, and by being used together more with net 42 It is reliably suppressed the variation of the film surface of casting films 29, and more reliably obtains the film 11 that flatness is improved.Also, by away from It is 50mm hereinafter, compared with the case where being greater than 50mm from D2, is used together with net 42, thus more reliably inhibits casting films 29 The variation of film surface.

The wall 82 that keeps out the wind extended along direction of travel X is arranged to and conveyer belt in the side ora terminalis 42c and this two sides of the side ora terminalis 42d 23 isolated states, by keeping out the wind the distance between wall 82 and conveyer belt 23 D3 in the range of 1mm or more and 50mm or less, more It is reliably suppressed the variation of the film surface of casting films 29, and more reliably obtains the film 11 that flatness is improved.Also, keep out the wind wall The 82 setting position on width direction Y is set in curtain coating face 23a but part without casting films 29 closer to casting films 29 Curtain coating face 23a width direction Y on both ends top, therefore back-blowing etc. can be more reliably prevented to casting films 29 Film surface influence.

[the 5th embodiment]

5th embodiment of the invention is the wind deflector being further provided in the 4th embodiment as the component that keeps out the wind 81b and auxiliary are kept out the wind the mode of component.In addition to further setting wind deflector 81b and auxiliary keep out the wind component, Fig. 9 A and Fig. 9 B institute The 5th embodiment shown is identical as the 4th embodiment, the portion in Fig. 9 A and Fig. 9 B, about mark and the same symbol of Fig. 1~8 Divide and have been carried out explanation, and the description is omitted.In Fig. 9 A and Fig. 9 B, in order to avoid the complication of attached drawing, the wall not shown that keeps out the wind 82L.In the present embodiment, wind deflector 81b is arranged in the upstream side of the net 42 on direction of travel X, moreover, keeping out the wind as auxiliary Component is provided with and contact with the opposed faces 42a of net 42 (with reference to Fig. 2), and in the width direction the auxiliary wind deflector 83a of Y extension, 83b,83c.In the following description, when not distinguishing auxiliary wind deflector 83a, 83b, 83c, it is recorded as auxiliary wind deflector 83.It closes In auxiliary wind deflector 83, it can only be arranged 1, also can be set multiple, in this example embodiment, be provided with 3 auxiliary wind deflectors 83a,83b,83c.In addition, wind deflector 81b itself shown in Fig. 9 A is not set in the mode shown in Fig. 9 B, make mould as be described hereinafter 28 play the function of wind deflector 81b.

As shown in (A) and (B) of Fig. 9 A, the upstream side of net 42 of the wind deflector 81b on direction of travel X is arranged to and passes The state for sending band 23 isolated.Also, by wind deflector 81b be configured to the state opposite with the upstream side ora terminalis 42f of net 42 and with than Net 42 is more to 23 side of conveyer belt state outstanding.Therefore, from the upstream side on direction of travel X to downstream side, it is configured in order mould 28, wind deflector 81b, net 42.Pass through wind deflector 81b, the opening the (the hereinafter referred to as the 3rd of the upstream side of the direction of travel X in gap 90 Opening) part sealed.As long as wind deflector 81b only will be configured to than net 42 more in the 3rd opening seal clearance 90 To 23 side of conveyer belt state outstanding, standing shape of the unlimited orientation relative to the top in the vertical direction of curtain coating face 23a State.The distance between wind deflector 81b and conveyer belt 23 D21 (not shown) are preferably in the range of 1mm or more and 50mm or less.? In the example, the distance between wind deflector 81b and conveyer belt 23 D21 and distance D2 are identical.In this example embodiment, it is arranged to wind deflector The state that 81b is contacted with net 42.Similarly, by wind deflector 81 and the wall 82L that keeps out the wind, wind deflector 81 and keep out the wind wall 82R, wind deflector 81 It is arranged to the state to contact with each other respectively with net 42.

As above-mentioned, Fig. 9 B is to make surface (hereinafter referred to as side) 28a in the downstream side of direction of travel X of mould 28 as figure The figure that the wind deflector 81b of 9A is functioned.The ora terminalis 42f of net 42 is set as the state contacted with side 28a.Side 28a with keep out the wind The wall 82L and wall 82R that keeps out the wind contact.As wind deflector or the wall that keeps out the wind, as long as capableing of the opening of closing gap 90, therefore such as this Mould or other devices etc. can be used in example.

As shown in (A) and (B) of Fig. 9 A, auxiliary wind deflector 83a, 83b, 83c are the opposed faces 42a with net 42 (with reference to figure 2) it contacts, and the rodlike component that Y extends in the width direction.Auxiliary wind deflector 83 is configured to the state opposite with curtain coating face 23a And with than net 42 more to 23 side of conveyer belt state outstanding.Auxiliary the distance between wind deflector 83 and conveyer belt 23 D22 (does not scheme Show) preferably in the range of 1mm or more and 50mm or less.In this example embodiment, assist between wind deflector 83 and conveyer belt 23 away from It is identical from the distance between D22 and wind deflector 81 and conveyer belt 23 D2.In this example embodiment, about auxiliary wind deflector 83a, 83b, 83c, with the sequence of symbol 83c, 83b, 83a, is disposed relative to net 42 from the upstream side on direction of travel X to downstream side The state that length on direction of travel X is substantially equally contacted with net 42.Wherein, auxiliary wind deflector 83a, 83b, 83c without etc. Compartment of terrain configuration.Auxiliary wind deflector 83 is bar-like member, and contacts configuration with the opposed faces 42a of net 42, and the bar-like member is in width The length spent on the Y of direction is almost identical as wind deflector 81 or wind deflector 81b, and contacts and match with the wall 81R and wall 81L that keeps out the wind that keeps out the wind It sets.In this example embodiment, all length on width direction Y of auxiliary wind deflector 83a, 83b and 83c almost with wind deflector 81 and gear Aerofoil 81b is identical.Both about wind deflector 81b and auxiliary wind deflector 83, one of them can be used, also can be used.

It, can by addition to wind deflector 81 and/or the wall 82 that keeps out the wind, also setting up wind deflector 81b and/or auxiliary wind deflector 83 Effectively inhibit in the convection current for just generating gas without restraint from the boundary layer after the outflow of mould 28 and in the casting films 29 that are not dried.

[the 6th embodiment]

6th embodiment of the invention is that the mode for the component that assists keeping out the wind is further provided in the 3rd embodiment.It removes Auxiliary is further provided with to keep out the wind other than component, the 6th embodiment shown in Figure 10 and Figure 11 is identical as the 5th embodiment, In Figure 10, about mark and Fig. 5 and Fig. 6 the same symbol part, had been carried out in the 3rd embodiment or the 2nd embodiment Bright, and the description is omitted.In the present embodiment, it in addition to the component that keeps out the wind, is additionally provided with and keeps out the wind component as auxiliary, with net 42 Contact with the opposed faces 42a of roller 123 (referring to Fig. 2) and prolong along direction of travel X (the paper depth direction of Figure 10 and Figure 11) The auxiliary of the component for the wall-like stretched is kept out the wind wall 84aR, 84aL, 84bR, 84bL.In the following description, when not distinguishing these auxiliary Keep out the wind wall 84aR, 84aL, 84bR, 84bL when, be recorded as auxiliary and keep out the wind wall 84.Auxiliary keep out the wind wall 84 towards direction of travel X on the right side The setting of the two sides in side and left side.It keeps out the wind wall 84 as auxiliary, the auxiliary for being set to the outside of casting films 29 as shown in Figure 10 is kept out the wind Wall 84aR and auxiliary are kept out the wind wall 84aL (hereinafter, when not distinguishing them, being recorded as " auxiliary keep out the wind wall 84a ") and to be set as shown in figure 11 The auxiliary being placed in casting films 29 keep out the wind wall 84bR and auxiliary keep out the wind wall 84bL (hereinafter, when not distinguishing them, be recorded as " auxiliary Keep out the wind wall 84b ") among both, one kind being arranged according to the setting position on width direction Y.Auxiliary keeps out the wind wall 84 in net 42 The two sides of width direction Y are arranged to the state isolated with roller 123.Also, auxiliary is kept out the wind the opposed faces 42a of wall 84 and net 42 Contact configuration, and be configured to than net 42 more to 123 side of roller state outstanding.Therefore, the auxiliary wall 84 that keeps out the wind is arranged to and net The state of 42 opposed faces 42a contact.As long as auxiliary keeps out the wind wall inside gap 90, it is configured to than net 42 more to 123 side of roller State outstanding, the projected state on vertical direction top of the unlimited orientation relative to circumferential surface 123a.

As shown in Figure 10, auxiliary keeps out the wind wall 84aR and auxiliary setting position of the wall 84aL on width direction Y of keeping out the wind is being rolled The circumferential surface 123a of cylinder 123 but part without casting films 29, i.e. both ends 123aL, 123aR of the width direction Y of circumferential surface 123a.It will Auxiliary keep out the wind wall 84aR and auxiliary keep out the wind wall 84aL be arranged to the top of both ends 123aL, 123aR net 42 opposed faces The state of 42a contact.As shown in Figure 10 (A), the auxiliary wall 84a that keeps out the wind is arranged to the state isolated with roller 123.Auxiliary is kept out the wind Wall 84aL and auxiliary keep out the wind the distance between wall 84aR and roller 123 D31 respectively preferably in 1mm or more and 50mm range below It is interior.

As shown in figure 11, auxiliary keep out the wind wall 84bR and auxiliary keep out the wind setting position of the wall 84bL on width direction Y not Belong to the part of product width (product area) 29P of casting films 29, i.e. the both ends 29SL of the width direction Y of casting films 29, 29SR.Auxiliary is kept out the wind into wall 84bR and the auxiliary wall 84bL that keeps out the wind is arranged to pair with net 42 above both ends 29SL and 29SR Set the state of face 42a contact.As shown in Figure 11 (A), the auxiliary wall 84b that keeps out the wind is arranged to the state isolated with casting films 29, it is auxiliary Help the wall 84bL and the distance between wall 84bR and roller 123 D32 that assists keeping out the wind that keeps out the wind respectively preferably in 1mm or more and 50mm or less In the range of.In this example embodiment, it is arranged to auxiliary to keep out the wind the state that wall 84bL, 84bR contact with net 42.

Wall 84a is kept out the wind by addition to wind deflector 81 and/or the wall 82 that keeps out the wind, also setting up auxiliary or auxiliary is kept out the wind wall 84b, energy It is enough effectively to inhibit in pair for just generating gas without restraint from the boundary layer after the outflow of mould 28 and in the casting films 29 that are not dried Stream.

Hereinafter, enumerating embodiment and comparative example.Detailed content is recorded in embodiment, only recorded about comparative example and is implemented The different condition of example.

Embodiment

[embodiment 1]~[embodiment 20]

Film 11 is manufactured by solution film-forming equipment 10, and as Examples 1 to 20.In table 1, metal net 42 is used When making porous member, it is recorded as " metal mesh " in " type of porous member " column, when using porous plate, is recorded as " porous plate ". In addition, porous plate with a thickness of 1mm, through hole is set as rectangular with 60 ° of angle.Also, in table 1, " setting section " Indicate the setting section of the porous member in the longitudinal direction of conveyer belt 23." whole region " expression is set to from casting position PC The case where to the whole region for stripping position PP, " before dry " indicate to be set to from casting position PC to gas supply drying unit 41 The case where section, that is, the case where being set between casting position PC and gas supply drying unit 41.Also, " gentle breeze region " indicates to set The case where being placed in above-mentioned gentle breeze region.In table 1, the case where indicating setting is recorded in corresponding " setting section " column "○".The solid component of rubber cement 21 is dissolved in the mixture of methylene chloride and methanol to be prepared for rubber cement 21.Rubber cement 21 is consolidated Body ingredient is as follows.Condition is shown in table 1.

17.1 mass parts of TAC

1st plasticizer, 1.7 mass parts

2nd plasticizer, 0.7 mass parts

For the sample strip 62 (referring to Figure 12) for sampling slabbing from each film 11 obtained, according to following method and base Standard has carried out flatness and corrugated evaluation.Show the results of the evaluation table 1.

1. flatness

It is illustrated with reference to evaluation method of the Figure 12 to flatness.Firstly, evaluating plate as sample, smooth glass is prepared Glass plate 61.Above-mentioned sample strip 62 is attached in the one side of the glass plate 61, and attaches black PET (poly- terephthaldehyde in another side Sour second diester) film 63, it is thus prepared for that the laminated body 64 by glass plate 61, sample strip 62 and black PET film 63 is laminated.When attaching Optics transparent bonding piece (not shown) is used.In the flatness evaluation system for being provided with fluorescent lamp 67, with sample strip 62 Mode upward placed laminated body 64.Point of observation PW is set in the flatness evaluation system, from point of observation PW Reflect the picture of the fluorescent lamp 67 in sample strip 62.As fluorescent lamp 67, the 40W straight pipe type fluorescent lamp of caliber 32.5mm has been used.

The set-down location of laminated body 64 is set as horizontal, thus the upper surface of sample strip 62 is set as level.Also, along a side It is also configured to level to the longitudinal direction of the fluorescent lamp 67 of extension, thus the upper surface of fluorescent lamp 67 and sample strip 62 becomes mutual In parallel.Fluorescent lamp 67 and point of observation PW are set as identical height, and position the set-down location of laminated body 64, so that laminated body 64 Set-down location, which is positioned in the light from fluorescent lamp 67, becomes 60 ° to the incidence angle of sample strip 62 and can be at angle of reflection (i.e. 60 °) It is observed, the central 62c from point of observation PW in the upper surface of sample strip 62 observes the picture of fluorescent lamp 67.By fluorescent lamp 67 with The distance between central 62c of the upper surface of sample strip 62 and point of observation PW is set as with above-mentioned the distance between central 62c 2m is labeled with symbol L1 in Figure 12.In addition, being labeled with symbol theta 1 to incidence angle and angle of reflection, and will irradiation in Figure 12 The outer contour Li of the picture of fluorescent lamp 67 in the state of the light of fluorescent lamp 67 is described with two chain-dotted lines.Outer contour Li is in sample The flatness of product piece 62 can be observed to straight line when extremely good, but flatness is poorer, can be observed to the bigger line of wave mode.

In the state of having irradiated the light of fluorescent lamp 67, laminated body 64 is rotated as rotation center using central 62c and is being seen The picture that the fluorescent lamp 67 in sample strip 62 is reflected in point PW observation is examined, in the maximum position stop-layer of the amplitude of the outer contour Li of picture The rotation of stack 64, and its posture is determined as evaluation object posture.Value maximum in the amplitude of outer contour Li is set as V1, The width of picture corresponding with the width of fluorescent lamp (diameter) is set as V2, and according to the calculating of following benchmark evaluations V1/V2 The value that formula acquires, using this as the evaluation of flatness.A is qualification, and B and C are unqualified.In addition, there is vibration in outer contour Li When width, by the ruler from the center of the amplitude of the outer contour Li of side until the center of the amplitude of the outer contour Li of the other side It is very little to be set as V2.

A: less than 1/10

B:1/10 is more than and less than 1/5

C:1/5 or more

2. corrugation

According to the drying condition of casting films 29, the solvent containing ratio for stripping position PP can be got higher, and can be in angle stripper 33 On film 11 generate corrugation, also confirmed wrinkle in sample strip 62.Therefore, sample strip 62 is visually observed, and according to following Benchmark carried out corrugated evaluation.A is qualification, and B is unqualified.

A: corrugation is not confirmed in sample strip.

B: corrugation is confirmed in sample strip.

After implementing the corrugated embodiment 1 for being evaluated as B, slightly the travel speed of conveyer belt 23 is reduced (specifically In embodiment 1,10%) every 1 minute travel distance reduces, and other conditions are constant, i.e., other conditions with 1 phase of embodiment Same condition, has manufactured film 11 again.For the film 11 so obtained, carried out flatness and corrugated evaluation as a result, flat The evaluation result that A is obtained in the same manner as the case where slip and blistering are with embodiment 1, wrinkles and obtains compared to the case where embodiment 1 It improves, obtains the evaluation result of A.

After implementing the corrugated embodiment 17 for being evaluated as B, slightly the travel speed of conveyer belt 23 is reduced (specifically In embodiment 17,10%) every 1 minute travel distance is reduced, other conditions are constant, i.e., other conditions with embodiment 17 Identical condition has manufactured film 11 again.For the film 11 so obtained, carried out flatness and corrugated evaluation as a result, The evaluation result of A is obtained in the same manner as the case where flatness and blistering are with embodiment 17, the case where corrugation is compared to embodiment 17 It is improved, obtains the evaluation result of A.

[comparative example 1]~[comparative example 5]

Film has been manufactured according to the conditions shown in Table 1.Other conditions are identical as embodiment.

Method identical with embodiment and benchmark evaluation flatness and corrugation.Show the results of the evaluation table 1.

[table 1]

[embodiment 21]~[embodiment 30]

By by the casting device 13 of the solution film-forming equipment 10 of Fig. 1 instead of Fig. 5 and casting device shown in fig. 6 113 Solution film-forming equipment (not shown), film 11 is manufactured, and as embodiment 21~30.Condition is shown in table 2.Similarly to Example 15 Ground, net 42 are set to section and gentle breeze region of the section i.e. from casting position PC until supplying drying unit 141 " before dry ". Wind deflector 81 and keep out the wind wall 82L and 82R are arranged to be in close contact with net 42, with the gap 90 of closed cylinder 123 and net 42.? Such as above-mentioned in table 2, " wind deflector setting distance " is the distance between wind deflector 81 and roller 123 D2, " distance is arranged in the wall that keeps out the wind " It is roller 123 and the distance between wall 82 D3 that keeps out the wind, and is the distance between circumferential surface 123c.Other and 15 phase of embodiment Together.

For the sample strip 62 (with reference to Figure 12) for being sampled as sheet from each film 11 obtained, in the same manner as embodiment, into Flatness and corrugated evaluation are gone.Wherein, the evaluation criteria of flatness is set as follows.Show the results of the evaluation table 2.

AAA: it can not determine (outer contour Li is without amplitude, i.e. V1=0)

AA: greater than 0 and less than 1/20

A:1/20 is more than and less than 1/10

B:1/10 is more than and less than 1/5

C:1/5 or more

[table 2]

Claims (13)

1. a kind of solution film-forming method, with following processes:

Casting films formation process, made of continuously curtain coating dissolves the polymer in solvent on the curtain coating supporter of traveling Rubber cement forms casting films；

Casting films drying process, the dry casting films；And

Strip process, by will have passed through the casting films of the casting films drying process from the curtain coating supporter strip come Film is formed,

It is formed with the curtain coating that diameter is up to the porous member of through hole of 7mm and the rubber cement of the curtain coating supporter is cast Face is opposed with isolated state and is arranged.

2. solution film-forming method according to claim 1, wherein

The porous member is net or porous plate.

3. solution film-forming method according to claim 1 or 2, wherein

The aperture opening ratio in the part side of opening is formed in 35% or more and 70% or less range by the through hole.

4. solution film-forming method according to any one of claim 1 to 3, wherein

Curtain coating the distance between the supporter and the porous member are in the range of 5mm or more and 50mm or less.

5. solution film-forming method according to any one of claim 1 to 4, wherein

The casting films drying process passes through the drying for being arranged to the state opposed with the curtain coating curtain coating face of supporter Device dries the casting films.

6. solution film-forming method according to claim 5, wherein

The porous member is configured between the casting position and the drying device of the rubber cement curtain coating.

7. solution film-forming method according to any one of claim 1 to 6, wherein

The porous member be set to make it is described curtain coating supporter traveling stop in the state of wind speed greater than 0m/s and 1m/ Region in the range of s or less.

8. solution film-forming method according to any one of claim 1 to 7, wherein

The wind flowed between the curtain coating supporter and the porous member, the component configuration of keeping out the wind are blocked by the component that keeps out the wind At the state opposite with the ora terminalis of the porous member and than the porous member more to curtain coating supporter side shape outstanding State.

9. solution film-forming method according to claim 8, wherein

The component that keeps out the wind is the wind deflector extended along the width direction orthogonal with the curtain coating direction of travel of supporter,

The wind deflector is arranged on the direction of travel of the curtain coating supporter with the state separated with the curtain coating supporter The porous member downstream side.

10. solution film-forming method according to claim 9, wherein

The distance between the wind deflector and the curtain coating supporter are in the range of 1mm or more and 50mm or less.

11. the solution film-forming method according to any one of claim 8 to 10, wherein

The component that keeps out the wind is the wall that keeps out the wind extended along the direction of travel of the curtain coating supporter,

The wall that keeps out the wind is arranged on the direction of travel with the curtain coating supporter with the state separated with the curtain coating supporter The two sides of the porous member in orthogonal width direction.

12. solution film-forming method according to claim 11, wherein

The distance between the wall and the curtain coating supporter of keeping out the wind is in the range of 1mm or more and 50mm or less.

13. the solution film-forming method according to any one of claim 8 to 12, wherein

The component that keeps out the wind is arranged to the state contacted with the porous member.