CN1420008A - Film mfg. method, winding method and film coil - Google Patents
Film mfg. method, winding method and film coil Download PDFInfo
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- CN1420008A CN1420008A CN 02151365 CN02151365A CN1420008A CN 1420008 A CN1420008 A CN 1420008A CN 02151365 CN02151365 CN 02151365 CN 02151365 A CN02151365 A CN 02151365A CN 1420008 A CN1420008 A CN 1420008A
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Abstract
Film is formed by casting the latex from the casting moudule to the band conveyer, then drying. The side end of side-cut film can carry out knurling processing by the roller wheel in the roller transmitting processing. The thickness of knurling can be adjusted based on the thickness of the film. Then drying, cooling and carrying out knurling processing, the side end of the film with processing knurling is removed brfore winding. In this way, the friction force between the film and the roller wheel can be adjusted. Therefore the film can stably carry out transmitting. Besides, the thickness of product knurling is more than 2 Mu m tahn that of the film end face. Moreover, the core winding can repeatly carry out movement to form essentially semicircular concave convex on the end face of the film winding when the film is winded. Thus, the offset, collapse and swell of the end face on the film winding can be prevented.
Description
Technical field
The present invention relates to manufacture method and the method for winding and the film coil (ロ-Le) of film, relate in particular to manufacture method and the method for winding and the film coil of the optical thin film that is used for LCD, organic EL, polarizer and polaroid protective film etc.
Background technology
Utilize the plastic sheeting of solution film forming manufactured to have low-birefringence, the transparency, suitable poisture-penetrability, mechanical strength is good, and qualitative good to the size temperature of humidity and variations in temperature, so, be widely used as optical materials such as polaroid protective film.
The solution film forming method, in the solution after for example polymer such as cellulose acetate dissolves, suitably add various additives, be mixed with rubber cement, make its curtain coating on the drum or conveyer belt of supporting mass for no reason, when treating itself to have formability (solidifying) it is stripped down,, form the film of lengthwise through drying process.Transmit with roller on the general limit of film in drying process, the limit hot-air seasoning.The winding film of making is on the cylindric volume core that resin, metal, timber, ground paper etc. are made, and its coiling length is according to situations such as purposes and capacities of equipment, and is about hundreds of rice to thousands of rice, suitably packs, and makes product form.The running roller that uses on baking operation in order to reduce equipment cost, is a driven pulley mostly, and it does not have the drive function, but the friction of utilizing and being transmitted between the film to be produced utilizes the conveying capacity of film to drive its rotation as driving force.Therefore, in the process that transmits film, if the frictional force deficiency of running roller and film then skidding can occur, the small concavo-convex meeting on running roller surface causes scratch to film, reduces value of the product.In order to prevent that this phenomenon from must improve the frictional force between running roller and the film.The method that adopts is the tension force on the direction of transfer that improves in the transport process.And its way is to improve the frictional force of running roller material and surface state, makes it produce suitable frictional force to film.
Yet, the method for the tension force on the direction of transfer of raising in transmission, its shortcoming is: film elongation in the vertical, especially in hot environment, significantly increase, influence film characteristics, especially influence optical isotropy and dimensional stability.And, owing to improve skin-friction force, so the running roller surface also can make film surface produce fine uneven or wrinkle.This problem, film are thin more remarkable more, must adjust the frictional force between running roller and the film at any time.
Therefore, improve the surfacing and the Surface Machining of running roller, this will take measures from equipment.This measure is very difficult, because the frictional force method of adjustment is affected by other factors easily.
And dried film is wound into web-like, preserves and carries with the film coil state.When coiled film,, then can produce various faults if the hardness of reeling is inappropriate.For example, if roll up really up to the markly, then uneven film thickness is even, thereby causes bonding between black-tape fault and the film, like this, causes the outward appearance fault of crackle (knick) shape etc. again.And,, then when film coil is preserved, produce lateral alternate, irregular (uneven) hereinafter referred to as end face if reel softly.This fault is fatal shortcoming for the film that optical characteristics and the exigent optics of flatness are used especially.
In the past,, various measures had once been taked for eliminating these faults.For example, adjust winding tension, the contact running roller is set, optimize the coiling condition, perhaps optimize the thickness figure, increase slickness, control is charged, improve thin film planar etc.And, in recent years, before facing coiled film, carried out annular knurl (Na-リ Application グ) (be designated hereinafter simply as the product annular knurl, also claim small concavo-convex, embossing, embossing processing etc.), in case the not-go-end face staggers irregular or the coiled material state is soft in the lateral ends of film.
Moreover, in recent years,, strict more to the requirement of winding film condition along with product film improves the quality or reduces thickness, increases length, improves requirements such as speed of production.The fault that only depends on above-mentioned measure can not fully suppress to reel and cause.Especially the film in the finishing operation of making film is cut edge and is added man-hour, on the film transverse end surface, can produce burr, the thickness of its end face (thick hereinafter to be referred as the limit) increases, and reaches identical with the film thickness (hereinafter to be referred as integral thickness) of the part of carrying out the product annular knurl.In the case, the annular knurl effect reduces, and produces fault.Moreover if the precision of the thickness (hereinafter referred to as annular knurl thickness) of product annular knurl reduces, rolling is in uneven thickness on the both side ends of film, and it is uneven then to be easy to generate end face on the film coil.Yet it is very difficult adjusting annular knurl thickness by the grade of 1 μ m, is unpractical.
Summary of the invention
Main purpose of the present invention is to provide a kind of difficult generation scratch and wrinkle, is used for the manufacture method of the cellulose acetate film of polarizer etc.
Another object of the present invention is to provide a kind of manufacture method that does not need to adjust the cellulose acetate film of the frictional force between running roller and the film.
The film coil that provides a kind of annular knurl effect not reduce is provided a further object of the present invention.
A further object of the present invention is to provide a kind of uneven film coil of end face that do not produce.
A further object of the present invention is to provide a kind of film coil and method of winding film of the fault of not reeling.
In order to achieve the above object, the manufacture method of cellulose acetate film of the present invention is that above-mentioned solution is supplied on the supporting mass in moving, carries out primary drying on above-mentioned supporting mass, forms above-mentioned film.And, above-mentioned film is carried out redrying after above-mentioned supporting mass strips down.The method that adopts in above-mentioned redrying is to form knurled portions near at least one side of above-mentioned film.
And film coil of the present invention has volume core and film, and this film has near the knurled portions that is formed on the side end, and film itself is winding on the above-mentioned volume core.And, in above-mentioned winding process, periodically staggered on above-mentioned thin-film width direction in one side of above-mentioned film and above-mentioned volume core, so on the side of above-mentioned film coil, form periodically concavo-convex, each states the volume core more than concavo-convex formation be the ring-type at center, and its Breadth Maximum (amplitude) h is 1.0～4.0mm.
Moreover method of winding film of the present invention is to form knurled portions near the film side.More than the big 2 μ m of thickness of the thickness of this knurled portions than above-mentioned side.And the above-mentioned winding film that has formed above-mentioned knurled portions to running roller.
Have, method of winding film of the present invention is to form knurled portions near the side of film again, above-mentioned winding film to the volume core on.And, in above-mentioned winding process, make above-mentioned film and above-mentioned volume core the two one of above-mentioned film transversely periodically the skew, on the side of above-mentioned film coil, form periodically concavo-convex, each concavo-convex formation is the ring-type at center with the volume core, and its Breadth Maximum (amplitude) h is 1.0～4.0mm.
If adopt film-forming method of the present invention, then, can improve the tension force when transmitting by film being carried out the processing of operation annular knurl, and, do not take equipment measures such as running roller Surface Machining, can prevent to make film scratch and wrinkle, produce qualified film.And can improve film production efficient, reduce cost of equipment.
Moreover if adopt method of winding film of the present invention, the transverse end surface thickness of then reeling is than the film more than the little 2 μ m of product annular knurl thickness, so, can prevent the uneven and depression of end face, bulging.And, wound film can be on the film coil end face formation rule concavo-convex, so, can prevent the uneven and depression of end face, bulging.
Description of drawings
Above-mentioned purpose and advantage by the reference accompanying drawing, are read the detailed description of preferred forms, and the colleague dealer is readily appreciated that.
Fig. 1 is the synoptic diagram of apparatus for manufacturing thin film of the present invention.
Fig. 2 is the mint-mark running roller in the apparatus for manufacturing thin film of Fig. 1 and the amplification oblique drawing of film.
Fig. 3 is the synoptic diagram with film coil manufacturing installation of winding film device of the present invention.
Fig. 4 is the sectional drawing of film coil.
Fig. 5 is the sectional drawing of film end.
Fig. 6 is the sectional drawing of film end.
Fig. 7 is that expression utilizes winding film device of the present invention to carry out the exemplary plot of wound film.
The specific embodiment
In film-forming method of the present invention, film can be from the rubber cement (De-プ) make that uses known all kinds of solvents.Adopting under the situation of cellulose acetate as the raw polymer of film, in solvent, halogenated hydrocarbons such as carrene, above-mentioned alcohol, ester, above-mentioned ether etc. can use separately or multiple mixing is used.
From the dissolved gum slurry, remove impurity and do not dissolve raw material etc. by filtration.Filtration can be adopted known various filtering materials such as filter paper, filter cloth, nonwoven, wire netting, sintered metal filter, porous plate.By filtering the impurity to reduce or to avoid in the rubber cement and the not film performance reduction that causes such as dissolved matter and damage, defective.
And, the rubber cement that dissolved is once heated, also can further improve solubility.The method of heating has: heating while stirring in the jar that leaves standstill, and perhaps utilize multitube or have the various heat exchangers such as jacket layer pipeline of silent oscillation blender, heat while transmit rubber cement.And, also can after heating process, carry out refrigerating work procedure.Also can be by to device internal pressurization power, and be heated to temperature more than the rubber cement boiling point.Can make not consoluet not dissolved matter reach fully dissolving by these heat treated, dissolved matter be reduced to reality is used negligible degree, can reduce the impurity in the product film, alleviate and filter load.
Moreover, can in rubber cement, add known additives.For example can add ultra-violet absorber and dispersant, plasticizer etc. as additive, but be not limited only to these.Also can add additives such as silica, kaolin, talcum powder in this external rubber cement.These additives utilize online mixing such as blender in the time of also can carrying after the preparation rubber cement.And also can when the preparation rubber cement, mix simultaneously.
Fig. 1 represents to be used for the typical example of the equipment of film-forming method of the present invention.Ultraviolet radiation absorption agent solution and micro-dispersed liquid are obtained from supply pump 10,11 with static mixer 12 respectively, carry out online (in line) and mix, and this mixed liquor on-line mixing are arrived in the rubber cement base material 13 again, obtain rubber cement 14.Rubber cement 14 to the conveyer belt 16 as supporting mass for no reason, utilizes hot-air seasoning to make solvent volatilization slowly from curtain coating mould (ダ イ) 15 curtain coatings.By the volatilization of solvent, make rubber cement 14 solidify setting substantially after, strip down from conveyer belt 16 as film 17, Yi Bian contact 4 drive roller wheel 18,, guide in the drying section 29 Yi Bian transmit.Drying section 29 is made of stenter dry section 19 and running roller dry section 23.In stenter dry section 19, utilize the tenter clip gap (not having diagram) that is arranged on the stenter track to bite film 17, its both sides are supported, add tension force, carry out drying.Film 17 is clamped by tenter clip gap after stenter dry section 19 comes out immediately, and the both sides portion of the film 17 of distortion is cut off machine 20 excisions.And, film 17 by 1 drive roller wheel 21 after, with mint-mark roller 22a, 22b the side end of film 17 is carried out operation annular knurl 41 (referring to Fig. 2).Behind operation annular knurl 41, film 17 is drawn towards in the running roller dry section 23.In temperature remained on 130 ℃ running roller dry section 23, film 17 was transmitted by a plurality of running rollers 24 on one side, Yi Bian carry out drying, cools off in cooling zone 25.And, about at this moment best cool to room temperature, but be not limited only to this.And, after the cooling, 26 pairs of film inboards of usefulness mint-mark running roller (rather than operation annular knurl 41, referring to Fig. 2), carry out product annular knurl (not having diagram).Behind the product annular knurl, with trimming device 27 excision operation annular knurls 41, film 17 is wound up on the core 28 immediately.
And, also can not establish mint-mark roller 26 and trimming device 27, the operation annular knurl as the product annular knurl.But, it is very strict that the position of common product annular knurl, thin-film width etc. are stipulated, the running roller dry section especially carries out annular knurl on finished product under the not too low condition of solvent containing ratio, later drying condition has small variations all may make the annular knurl shift in position, and effect is bad.
Mint-mark roller 22a, 22b, the two side ends that is preferably in film 17 respectively is provided with a pair of, so that from clamping film 17 up and down.The form of mint-mark roller 22a, 22b, for example diameter is 100mm.Form annular knurl projection figure 40 on it, be used on the film 17 that is transmitted, carrying out operation annular knurl 41 (referring to Fig. 2).But be not limited only to this.Annular knurl projection figure 40 if the operation annular knurl that carries out can fully be regulated the frictional force between film 17 and the running roller, can adopt various forms so.And, the snap-in force of mint-mark roller is adjusted, make thickness average value value of achieving the goal of operation annular knurl.And, also can adopt known any method to try to achieve operation annular knurl average thickness value in the present invention.Specifically, the thickness average value of operation annular knurl 41 utilizes little wild digital liner DG-933 and the platform rule ST-022 that surveys the device corporate system to obtain.If adopt it, the film length that then is equivalent to mint-mark roller rotation 1 circle is 314mm.Method is: this film length is divided into 20 five equilibriums, the thickness of each central portion of the knurled portions of cutting apart such as measure, thickness to each central portion is obtained mean value, but be not limited only to this method, and, from this mean value, deduct the average film thickness value of the film 17 of non-knurled portions, obtain the thickness average value of operation annular knurl 41.Moreover the thickness average value of operation annular knurl 41 changes with conditions such as the thickness of transfer rate and film 17, rigidity.The method of adjustment of the thickness of operation annular knurl 41 can be undertaken by the snap-in force of adjusting a pair of mint-mark roller.Can utilize known method without restriction specifically, the method for for example placing the weight application of load is utilized the method that air pressure, hydraulic pressure, oil pressure etc. pressurize and is utilized spring to apply the method for mechanical pressure.
When carrying out operation annular knurl 41, the solvent containing ratio of film 17 (unit: weight %) be transferred to optimum value.Its measuring method is described as follows.The weight of supposing the closed container of having put into the film before dry is X; Open the lid of closed container, in 115 ℃ drying machine, make film 17 dryings 90 minutes, and then cover lid, be cooled to normal temperature, open lid again one time, cover lid more immediately then, the weight of having put into the closed container of the dried film 17 after measuring is Y, only the weight of closed container and lid is Z, obtains with calculating formula { (X-Y)/(X-Z) } * 100 (%).
Operation annular knurl 41 utilizes the plastic deformation of film to make, if the film rigidity when carrying out the operation annular knurl is little, then operation annular knurl profile thickens unclearly, and effect reduces.So operation annular knurl 41 should have the stage of certain rigidity at film, promptly carries out under the lower state of solvent containing ratio.On the other hand, increase, transfer rate is reduced in order after the solvent containing ratio is very low, to carry out the operation annular knurl, must make to carry out operation annular knurl stenter dry section before.So, be disadvantageous to production efficiency and cost of equipment.Therefore, the solvent containing ratio when carrying out the operation annular knurl with weight ratio be below 30% for well, 10～30% is better, 10～25% is best.
Film 17 has or not scratch, can weaken the light around reeling when reeling, and with the light irradiating film 17 of slide projector, can very critically check and identify with visual means.Having under the abrasive situation, there is passage of scintillation light this position.Therefore, can be judged as scratch, this part has been taken a sample to check, determine the scratch happening part, like this, can judge that the scratch generating plane is and contacted of conveyer belt, still non-contacting, and, have or not abrasive inspection to be not limited only to this method.
Below utilize experimental example, specify film-forming method of the present invention.But content of the present invention is not limited only to this.Raw material rubber cement 14 all is the same in embodiment and comparative example, adopted the mixture of rubber cement base material 13, ultraviolet radiation absorption agent solution, micro-dispersed liquid.
[preparation of rubber cement base material 13]
Cellulose acetate (oxidizability 60.9%) 89.3% (weight ratio)
Triphenyl phosphate 7.1% (weight ratio)
Biphenyl diphenyl phosphoester 3.6% (weight ratio)
(ビフエニルジフエニルフオスフエ—ト)
The wt part of the solid constituent that constitutes with above-mentioned three kinds of materials is 100, suitably adds the mixed solvent of following composition formation in addition;
Methyl alcohol 15% (weight ratio)
More than after various compositions stir together, be mixed with rubber cement base material 13.The solid component concentration of rubber cement base material 13 is that this rubber cement base material 13 of 18.5% (weight ratio) is through filter paper (Japan's filter paper (joint-stock company) system, after #63) 34a filters, pass through sintered metal filter (Japanese smart line (joint-stock company) system 06N, normal pore size 10 μ m) 34b again and filter, pass through sintered metal filter (Japan's industry line (joint-stock company) system 12N normal pore size 40 μ m) 34c again and filter.
[preparation of ultraviolet radiation absorption agent solution] 2 (2 '-hydroxyl-3 ', 5 '-two-tert-butyl phenyl)-5-chlorobenzotriazole 5.33% (weight ratio) 2 (2 '-hydroxyl 3 ', 5 '-two-uncle-amyl group phenyl) BTA 10.67% (weight ratio) cellulose acetate (oxidizability 60.8%) 3.57% (weight ratio) triphenyl phosphate 0.29% (weight ratio) biphenyl diphenyl phosphoester 0.14% (weight ratio) carrene 68.00% (weight ratio) methyl alcohol 12.00% (weight ratio)
By above one-tenth assignment system ultra-violet absorber solution, filter once through Fuji's description film (joint-stock company) system ア ス ト ロ Port ア 10 μ m filters.
[preparation of micro-dispersed liquid] silica (the Japanese AEROJIR AEROJIRR972 processed of company) 2.00% (weight ratio) cellulose acetate (degree of exchange 2.8) 2.00% (weight ratio) triphenyl phosphate 0.16% (weight ratio) biphenyl diphenyl phosphoester 0.08% (weight ratio) carrene 81.40% (weight ratio) methyl alcohol 14.36% (weight ratio)
Utilize above one-tenth assignment system micro-dispersed liquid, utilize grater (attritor) to disperse, make it become volume average particle size 0.5 μ m.At this, volume average particle size adopts by the hole field and makes the value that the particle size distribution measurement device LA920 of institute measures.Utilize the Astropore10 μ m filter of Fuji's description film corporate system to carry out 2 filtrations, obtain micro-dispersed liquid.Utilize 12 pairs of ultraviolet radiation absorption agent solutions of static mixer and micro-dispersed liquid to carry out on-line mixing, again its on-line mixing is arrived in the rubber cement base material 13, obtain raw material rubber cement 14.At this, the addition of ultraviolet radiation absorption agent solution is adjusted to following degree: represent to represent with respect to the value of the ultraviolet radiation absorption agent solution of solid constituent in the rubber cement and with μ m the value of the film thickness made with weight %, the long-pending of the two is 83.2.And the addition of micro-dispersed liquid is adjusted to following degree: compare with the weight of the film of making 17, the value of representing the weight rate of the silica in the micro-dispersed liquid with % is 0.13.
[the 1st embodiment]
Utilize membrane equipment shown in Figure 1 to make film by rubber cement 14.Make rubber cement 14 from curtain coating mould 15 curtain coatings to conveyer belt 16, this conveyer belt 16 is supporting masses for no reason, curtain coating speed is set at the 50m/ branch, so that the thickness of product film reaches 80 μ m.With hot blast it is dried and to solidify setting back and strip down as film 17.This film 17 enters stenter dry section 19 after by 4 driven rollers 18, its both sides portion is supported apply tension force, dries.After coming out from stenter dry section 19, film 17, carries out the operation annular knurl with mint-mark roller 22 by 1 driven roller, 21 backs immediately the excision of the both sides portion of the film 17 of being clamped by stenter and being out of shape.At this, take a sample, the solvent containing ratio of MEASUREMENTS OF THIN 17, the result is 28% (weight ratio).Then, at running roller dry section 23 surface temperature of film 17 is heated to the highest 130 ℃ of further oven dry.Tension adjustment in running roller dry section 23 is at 50～100N/m.After in cooling zone 25, being cooled to normal temperature, carry out the product annular knurl with each a pair of mint-mark running roller 26 of both sides.At this moment, to make the thickness average value of product annular knurl be 10 μ m to the snap-in force of adjusting the mint-mark running roller.Carry out excising both side ends with trimming device immediately after the product annular knurl, making the product film width is 1340mm.Be wound up on the FRP system volume mandrel 28 of external diameter 168mm.The side end that cuts away is taken a sample, measure the thickness average value of operation knurled portions, its result is 4 μ m.Winding tension is 220N/m when beginning to reel; When finishing to reel is 140N/m.Side cut operation before the operation annular knurl only plays the coiling operation, and the non-driven roller of She Zhiing is 350 therebetween.Come the face of irradiate 17 with the light of lantern projection's instrument when reeling, it has or not scratch with visual examination.As a result, contact-making surface and the noncontact face with conveyer belt 16 all do not have scratch and wrinkle.
[the 2nd embodiment]
Curtain coating speed is transferred to the 30m/ branch, and the tension force of running roller dry section 23 is transferred to 50～70N/m.Other are identical with the 1st embodiment.The system film finishes the back and have or not scratch with the visual examination film when reeling, and the contact-making surface of result and conveyer belt 16 and noncontact face all do not have scratch and wrinkle.
[the 3rd embodiment]
Replace being provided with mint-mark running roller 22, in the contact surface side of 17 pairs of conveyer belts 16 of film the mint-mark running roller is set, do not have the straight roll of annular knurl protruding figure in the setting of noncontact face side, the two respectively is provided with a pair of on the film both side ends as a pair of.Other conditions are identical with the 1st embodiment.Carried out the system film.When reeling, have or not scratch with the visual examination film.As a result, do not abrade having on the contact-making surface of conveyer belt 16, but scratch is arranged on the noncontact face, but degree is slight, does not influence product quality.Do not find wrinkle.
[the 4th embodiment]
Adjust the snap-in force of mint-mark running roller 22, make the thickness average value of operation annular knurl reach 8 μ m.Other conditions are identical with the 3rd embodiment, make.Have or not scratch with the visual film of checking during coiling, its result, the contact-making surface and the noncontact face of film and conveyer belt 16 all do not have scratch and wrinkle.
[the 5th embodiment]
Mint-mark running roller 22 is arranged on film 17 side end on one side on the contact surface side to conveyer belt 16; On noncontact face side on the side end of another side, other conditions are identical with the 3rd embodiment.When making the back coiling, film has or not scratch with the visual film of checking, its result, and the contact-making surface and the noncontact face of film and conveyer belt 16 all do not have scratch and wrinkle.
[the 6th embodiment]
Only carry out the operation annular knurl on the side end to one side of film 17, other conditions are identical with the 1st embodiment, have or not scratch, its result with the visual film of checking when film is made the back coiling, the contact-making surface and the noncontact face of film and conveyer belt 16 all do not have scratch and wrinkle.
[the 7th embodiment]
Raw material rubber cement 14 is carried out curtain coating, make the film thickness of making reach 40 μ m.All the other conditions are identical with the 1st embodiment.Make when reeling behind the film and have or not scratch with the visual film of checking, its result, the contact-making surface and the noncontact face of film and conveyer belt 16 all do not have scratch, but discovery has slight wrinkle, does not influence product quality.
[the 8th embodiment]
Snap-in force to mint-mark running roller 22 is adjusted, and makes the even value of thickness of operation annular knurl reach 2 μ m.Other conditions are identical with the 7th.Make when reeling behind the film and have or not scratch with the visual film of checking, its result, the contact-making surface and the noncontact face of film and conveyer belt 16 all do not have and abrade and wrinkle.
[the 9th embodiment]
The drying condition of change conveyer belt 16 and stenter dry section 19, other are identical with the 1st embodiment.Make.The solvent containing ratio that carries out the part of operation annular knurl is a weight ratio 36%, and the thickness average value of operation annular knurl is below the 1 μ m.Check the visual scratch that has or not during winding film, the result film to the noncontact face of conveyer belt 16 on not scratch, and slightly scratch on contact-making surface, but no problem.Do not find wrinkle.
[the 1st comparative example]
Except not carrying out the operation annular knurl, other are all identical with the 1st embodiment, have or not scratch with the visual film of checking during coiling, its result, and the contact-making surface and the noncontact face of film and conveyer belt 16 are all found scratch.Do not find wrinkle.
[the 2nd comparative example]
Except curtain coating speed is transferred to 30m/ exceptionally, all relatively side is identical with the 1st for other.Have or not scratch with the visual film of checking during coiling, its result, the contact-making surface and the noncontact face of film and conveyer belt 16 all do not have scratch.But discovery wrinkle.
[the 3rd comparative example]
Team the tension force of running roller dry section 23 is set at outside 50～70N/m, other are all identical with the 2nd comparative example.Have or not scratch with the visual film of checking during coiling, its result, the contact-making surface and the noncontact face of film and conveyer belt 16 all do not have scratch and wrinkle.
In embodiment shown in Figure 1, the film transmission when making film easily is provided with knurled portions (operation annular knurl) on film, this operation annular knurl is cut off.This knurled portions can prevent to bond between the film the winding film rolling time.Fig. 3～Fig. 7 represents the embodiment that forms knurled portions before the winding film rolling.In Fig. 3, in film coil manufacturing installation 60, be provided with tank diameter 62.In this tank diameter 62, store rubber cement 64, rubber cement is sent in the filter 68, in this filter 68, filter by pump 66.On the curtain coating conveyer belt (also claiming conveyer belt) 72 of rubber cement 64 after the filtration from the front end curtain coating of curtain coating mould 70 to walking.Curtain coating conveyer belt 72 is formed by corrosion resistant plate etc., does not have the termination, and the surface is through mirror finish processing.Curtain coating strips down behind solidification forming to the rubber cement 64 on this curtain coating conveyer belt 72.The film 74 of being stripped from carries out drying by extension drying section 76 and the running roller drying section 78 that adopts stenter.Especially in running roller drying section 78, by running roller 80 transmit film 74 on one side, blow film 74 with dry air on one side, make film 74 fully dry like this.It is movable by after on the running roller 85 that dried like this film 74 is directed in the final stage of running roller drying section 78, adjusts the lateral attitude with marginal position control device 98.
The adjusted film 74 in position is clamped by a pair of running roller 86a, the 86b of Knurling device 82.At least one running roller is the mint-mark running roller in a pair of running roller 86.On one side is the mint-mark running roller, and another side is under the situation of plane running roller, carries out product annular knurl 84 (referring to Fig. 5) on a face of the film of being pushed by a pair of running roller 86 74.And, under the situation of two mint-mark running rollers, on two faces of the film of pushing by a pair of running roller 86 74, carry out product annular knurl 84 (referring to Fig. 6).
With cut edge film 74 after the processing of trimming device 88, utilize the static device 93 that disappears eliminate on the film 74 with static, be wound up into then on the volume core 94 of coiler device 92 and form web-like.Push film 74 with contact running roller 96 during coiling,, can improve the film coil shape simultaneously to prevent to be involved in air.During coiling, the volume core 94 of coiler device 92 is moved back and forth in the horizontal regularly, as shown in Figure 4, form film coil 90.That is to say that forming with volume core 94 regularly is the micro concavo-convex that the center is roughly concentric circles on the side 90a of film coil 90.This concavo-convex preferably as far as possible being formed uniformly in the footpath of film coil 90 makes progress.According to coiling condition difference, also can be only in the outside, the inboard setting, make its local existence.And concavo-convex section configuration is the combination of diabolo preferably, i.e. zigzag.But also can adopt arbitrary shapes such as trapezoidal, sinusoidal.And being preferably formed as concavo-convex peak swing h is 1.0～4.0mm.Moreover the ratio (h/P) that is preferably formed as peak swing h and spacing (waveform) P is 0.2～1.0.And, in order to be substituted in the reciprocating motion that transversely makes volume core 94 regularly, and marginal position control device 98 is set at the leading portion place of coiler device 42, utilize this marginal position control device 98 that the position of film 74 is changed in the horizontal regularly, coiling also can obtain effect same like this.
The film coil 90 of Huo Deing is preserved as required or is transmitted like this.And, rewind at subsequent processing, on the single face of film 74, carry out non-glare treated or coating emulsion etc.Then, the product section of film 74 (removing the part of side end) is cut into the shape of regulation, make the products such as protective film of polarizer.
In Fig. 5 and Fig. 6, carried out the film 74 of product annular knurl 84 in the end if be wound into web-like, then can suppress the uneven and black-tape fault of end face owing to the annular knurl effect.
In order fully to obtain this annular knurl effect, product annular knurl 84 can be made following shape (referring to Fig. 5).For example, the thickness of product annular knurl 84 (annular knurl thickness) a can be set at below the 12 μ m, and better again is below the 10 μ m, is preferably below the 8 μ m.Annular knurl thickness a deducts the average thickness T0 of film 74 and the value of trying to achieve from thickness (hereinafter referred to as the gross thickness) T1 of the part film 74 that has carried out product annular knurl 84, if this value is excessive, then central portion caves in when coiled film 74, on the contrary, if this value is too little, then can not give full play to the original effect of product annular knurl 84.The method that annular knurl thickness a is adjusted is to change the pressing force that 86 pairs of films 74 of a pair of running roller are pushed.And, in a pair of running roller 86 at least one is heated to more than 100 ℃, preferably reach more than 105 ℃.Like this, can accurate control annular knurl thickness a.
Moreover, in order to give full play to the annular knurl effect, preferably make gross thickness T1 reach inboard 84a 〉=outside 84b.The annular knurl 84 of this shape forms by the gradient of adjusting a pair of running roller 86.
Have, annular knurl 84 preferably reaches in the 20mm from the distance L of the widthwise edge genesis of film 74 again, and the width W of annular knurl 84 preferably reaches 5～15mm.
The side cut processing of film 74, the thickness of section 74a (it is thick to be designated hereinafter simply as the limit) T2 is than more than the little 2 μ m of gross thickness T1, more than the preferably little 3 μ m.Like this, can prevent that the thick T2 in limit from increasing, and produces harmful effect to product annular knurl 84.
The below effect of explanation film-forming method of the present invention and film coil 90.
Add man-hour when utilizing trimming device 88 to come film 74 cut edge, as shown in Figure 5 and Figure 6, on section, most likely produce burr, before cutting off, thicken.If it is identical with gross thickness T1 that the thick T2 in this limit increases to, then can not give full play to the rolling effect.It is uneven to be easy to generate tangible end face during coiling.But, in the present embodiment, make the thick T2 in limit than more than the little 2 μ m of gross thickness T1, film 74 is reeled, so be not subjected to the harmful effect of section burr, can give full play to the annular knurl effect.It is uneven to prevent to produce tangible end face like this on the film coil behind the coiling 90.
And the film coil 90 of Zhi Zaoing forms the micro concavo-convex that product annular knurl 84 brings regularly on its end face in the present embodiment, so, can suppress the uneven phenomenon of end face.After being provided with concavo-convex film 74 coilings of rule like this, the trueness error of gross thickness T1 averages out.So the influence of the precision of total thickness T1 reduces, it is uneven that film coil 90 is difficult for producing end face.Concavo-convex by being provided with, film 74 is reeled under the state that its endface position staggers, so can reduce the influence of the thick T2 in limit to product annular knurl 84, therefore, the film coil 90 of present embodiment can improve depression, bulging etc., can suppress the skew of reeling again.
Moreover in the present embodiment, concavo-convex peak swing h is decided to be 1.0～4.0mm, so, can prevent when in the operation of back, rewinding that film 74 from producing wrinkle and skew etc.That is to say, when big, can prevent to rewind film 74 and produce wrinkle and skews as concavo-convex peak swing h.And, because concavo-convex peak swing is little, so, needn't change packing and operation such as transmission, the method in past, mode, do not add change and can use.
Like this, the film coil manufacturing equipment 60 of present embodiment can be made good film coiled material 90, prevents that factor such as coiling such as the uneven and depression of end face grade from causing fault.So, help high speed processing (the coiling factor easily causes fault during high speed), film 74 attenuates and growth, fall as the above long film 74 of 1500m that is suitable for reeling.And also be suitable for carrying out the high speed curtain coating that 55m/ divides, can enhance productivity, can prevent the fault that the coiling factor causes again.
Moreover film coil of the present invention 90 is difficult for producing shortcomings such as the uneven and depression of end faces.So the film 74 of film coil 90 is suitable for making the film for optical use that requires delicate optical characteristics and flatness, be particularly suitable for making 500～600mm visible rays transmitance and be the film more than 90%.This film for example has cellulose triacetate film.The protective film that this cellulose triacetate film is for example used as polarizer.Clamp the PVA film (polarizer) that contains iodine molecule with a pair of protective film, can manufacture the high-quality polarization sheet.And,, can make high-quality liquid crystal display device (LCD) by utilizing this polarizer.And cellulose triacetate film, its thickness be 30～200 μ m preferably.If thickness is less than 30 μ m, then as protective film, its insufficient strength, if thickness surpasses 200 μ m, then polarizer thickens, commodity value reduces.
And above-mentioned embodiment has reached two requirements simultaneously, the one, and the thick T2 in limit is than more than the little 2 μ m of total thickness T1; The 2nd, on the end face of film coil 90, be provided with the concavo-convex of rule.But only reaching a requirement, also to suppress end face uneven.
And, when especially only on a face of film, the product annular knurl being set, can on the face that the product annular knurl is not set, apply equably.Moreover only the product annular knurl that is provided with on a face utilizes plastic deformation to form usually, so, over time little, can prevent film coil skew for a long time and subside, bulging.
And, trimming device 88 (referring to Fig. 3), its side cut crudy can reach and prevent that the film lateral ends from producing burr, and the thick T2 in limit is than getting final product more than the little 2 μ m of total thickness T1.For example both can be to utilize the processing of cutting edge of laser and ultrasonic wave, also can be that the section to the processing of cutting edge carries out punching press or adds drop stamping, and the thick T2 in limit is reduced.Moreover, also can be optimized etc. the limit portion diffuser plate shape of curtain coating mould 70, change the front end shape, make the thin film 74 in end, reduce the thick T2 in limit with this.And, also can not reduce the thick T2 in limit, increase total thickness T1 and replace.But from reducing the viewpoint of film thickness, and prevent that the viewpoint that the film central portion subsides is unsatisfactory.
Below explanation utilizes the experimental example of the embodiment of Fig. 3.As the film raw material, the polishing material that disappears, plasticizer, UV absorbent except that cellulose acetate, have also been sneaked into.Having adopted the visible rays transmitance is 91.0～92.6%.And, film uses the raw material of width as 1340mm, on one side change various conditions (total thickness T1, the thick T2 in limit, concavo-convex peak swing h, spacing P, processing speed, winding tension, film average thickness T0, film length), Yi Bian observe end face uneven, subside, the generation situation of film defects such as bulging.
And film defects is at the film coil state and opens the back and with visual the film total length is checked, estimated.And the inspection of film defects is to carry out respectively after product has just been made and after through one month.Moreover the end face of film coil is uneven to be checked after the film coil transportation under film coil management and the certain condition.
The product annular knurl only forms on the film single face as shown in Figure 5, forms wide 10mm on the position of leaving film edge 2mm.The measurement of product annular knurl is located to measure for 3 in the horizontal, and in length 30cm scope, every 1cm measures 30 points at most, obtains mean value.
Above-mentioned measurement result is shown in Fig. 7.And the winding tension in the table shown in Figure 7 is represented the initial stage and is reeled when finishing.
As shown in Figure 7, comparative example 11,12, the difference that is total thickness T1 and the thick T2 in limit is 0, so, can not obtain sufficient annular knurl effect, it is uneven to have produced tangible end face.Especially in comparative example 11 annular knurl thickness a (=T1-T0) bigger, be 12 μ m, be easy to generate and subside and bulging.
In contrast to this, embodiment 11 because of T2 than the little 3 μ m of T1, so the uneven phenomenon of end face is improved greatly, end face uneven (deviation) is 2mm.Equally, embodiment 12,13 also is that T2 is than the little 3 μ m of T3, so the uneven improvement greatly of end face.But the order of pressing embodiment 11～13 improves curtain coating speed successively, and the coiling condition is tighter, so the end face departure little by little increases.
Therefore, in embodiment 14, compare with embodiment 13, winding tension increases, and coiling hardness also increases.Its result, the end face deviation reduces, but has newly produced the defective of bonding between the coiled film, generation black-tape fault.
So, after embodiment 15, on the film coil end face, form concavo-convex during coiling.Therefore, eliminated the generation of end face deviation basically.But peak swing h concavo-convex in embodiment 15 is excessive, produces twisting and wrinkle when next process rewinds film coil.
In embodiment 16, owing to reduced its peak swing h, so the film coil of the factor fault that obtained not reel.
Embodiment 17, because of h/P is big, (being that concavo-convex spacing P is very little) so, can not fully obtain to be provided with concavo-convex effect.Produce some end face deviations.
In contrast to this, in Figure 18～22, because h/P adjusted in 0.2～1.0 the proper range, so, can obtain the good film coiled material.
Embodiment 23,24, are the situations that film average thickness T0 is thinned to 40 μ m, make T2 than the little 3 μ m of T1, simultaneously, are provided with the concavo-convex of suitable size, so improved the end face deviation.Embodiment 25 is big slightly because of h/P, so when operation transmits below, produce wrinkle.In embodiment 26, increased film thickness, reach 160 μ m, set identical condition about the thick T2 in limit with concavo-convex, so, obtained the good film coiled material.
Claims (27)
1, a kind of method of making cellulose acetate film with cellulose acetate solution is characterized in that having following steps:
Above-mentioned solution is supplied on the supporting mass in moving, on above-mentioned supporting mass, carry out primary drying, form above-mentioned film;
Above-mentioned film is stripped down from above-mentioned supporting mass;
The above-mentioned film that strips down from above-mentioned supporting mass is carried out redrying;
In above-mentioned redrying, near at least one side of above-mentioned film, form knurled portions.
2, the method for claim 1 is characterized in that having following steps:
After above-mentioned redrying finishes, cut off and remove above-mentioned knurled portions;
After cutting off the removal knurled portions, the above-mentioned film of reeling.
3, the described method of claim 2 is characterized in that:
Above-mentioned knurled portions is formed on the two sides of above-mentioned film.
4, method as claimed in claim 2 is characterized in that:
The thickness of above-mentioned knurled portions is regulated according to the thickness of above-mentioned film.
5, method as claimed in claim 2 is characterized in that:
When forming above-mentioned knurled portions, the solvent containing ratio of above-mentioned film is below 30% weight ratio.
6, method as claimed in claim 2 is characterized in that:
Before forming above-mentioned knurled portions, transmit above-mentioned film by the running roller that drives by motor.
7, method as claimed in claim 2 is characterized in that:
The above-mentioned film that has formed above-mentioned knurled portions is at least by a driven pulley.
8, the cellulose acetate film of making of the method for claim 1.
9, a kind of polarizer uses the described cellulose acetate film of claim 8.
10, a kind of film is wound into coiled material, it is characterized in that:
Form knurled portions near the side of above-mentioned film, the thickness of this knurled portions is than more than the thick 2 μ m of above-mentioned side.
11, the described film of claim 10 is characterized in that:
Height as the knurled portions of the difference of above-mentioned film average thickness and above-mentioned knurled portions thickness is below the 12 μ m.
12, film as claimed in claim 10 is characterized in that:
Above-mentioned knurled portions only is formed on the face of above-mentioned film.
13, film as claimed in claim 10 is characterized in that:
Above-mentioned film, the transmitance of the visible light of the scope of its 500nm～600nm are more than 90%.
14, film as claimed in claim 10 is characterized in that:
Above-mentioned film is a cellulose acetate film, and the thickness of above-mentioned film is 30 μ m～200 μ m.
15, film as claimed in claim 10 is characterized in that:
The length of above-mentioned film is more than the 1500m.
16, film as claimed in claim 10 is characterized in that:
Above-mentioned film is used for polarizer.
17, film as claimed in claim 10 is characterized in that:
Above-mentioned film is used for the polaroid of LCD.
18, a kind of film coil is characterized in that comprising:
The volume core; And
Film; It has near the annular knurl that is formed on the side, itself is wound onto on the above-mentioned volume core;
In above-mentioned winding process, make the transversely periodically skew of a side of above-mentioned film and above-mentioned volume core at above-mentioned film, make to form periodically concavo-convexly on the side of above-mentioned film coil, each states the volume core more than the concavo-convex formation be the ring-type at center, and its peak swing h is 1.0～4.0mm.
19, film coil as claimed in claim 18 is characterized in that:
The spacing P of above-mentioned peak swing h and above-mentioned waveform poor (h/p) is 0.2～1.0.
20, film coil as claimed in claim 18 is characterized in that:
Above-mentioned knurled portions only is formed on the face of above-mentioned film.
21, film coil as claimed in claim 18 is characterized in that:
Above-mentioned film, the transmitance of the visible light of its 500nm～600nm scope is more than 90%.
22, film coil as claimed in claim 18 is characterized in that:
Above-mentioned film is a cellulose acetate film.The thickness of above-mentioned film is 30 μ m～more than the 200 μ m.
23, film coil as claimed in claim 18 is characterized in that:
The length of above-mentioned film is more than the 1500m.
24, film coil as claimed in claim 18 is characterized in that:
Above-mentioned film is used for polarizer.
25, film coil as claimed in claim 18 is characterized in that:
Above-mentioned film is used for the polarizer of LCD.
26, a kind of method of winding film is characterized in that having following steps:
Near the side of film, form knurled portions, more than the big 2 μ m of thickness of the thickness of this knurled portions than above-mentioned side;
The above-mentioned winding film that has formed above-mentioned knurled portions is become coiled material.
27, a kind of method of winding film is characterized in that may further comprise the steps:
Near the side of film, form knurled portions;
Above-mentioned winding film to the volume core on;
In above-mentioned winding process, a side who makes above-mentioned film and above-mentioned volume core forms periodically concavo-convex on the side of above-mentioned film coil in the transversely periodically skew of above-mentioned film;
Each states the volume core more than the concavo-convex formation be the ring-type at center, and its peak swing h is 1.0～4.0mm.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001351190A JP2003147092A (en) | 2001-11-16 | 2001-11-16 | Film roll and method for winding film |
| JP351190/2001 | 2001-11-16 | ||
| JP2001377214A JP3947394B2 (en) | 2001-12-11 | 2001-12-11 | Solution casting method |
| JP377214/2001 | 2001-12-11 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100037139A Division CN100395569C (en) | 2001-11-16 | 2002-11-18 | Film winding method and film coil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1420008A true CN1420008A (en) | 2003-05-28 |
| CN100418726C CN100418726C (en) | 2008-09-17 |
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ID=26624558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021513651A Expired - Lifetime CN100418726C (en) | 2001-11-16 | 2002-11-18 | Film mfg. method, winding method and film coil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100418726C (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100436710C (en) * | 2005-12-09 | 2008-11-26 | 王盛荣 | Phosphorus-boron paper producing process and apparatus |
| CN102096121A (en) * | 2009-12-14 | 2011-06-15 | 富士胶片株式会社 | Polymer membrane, membrane roller and knurling endowing roller |
| CN102483481A (en) * | 2009-09-14 | 2012-05-30 | 柯尼卡美能达精密光学株式会社 | Method of manufacturing optical film, optical film, deflection plate, and liquid crystal display device |
| CN102537753A (en) * | 2010-12-09 | 2012-07-04 | 鸿富锦精密工业（深圳）有限公司 | Backlight diaphragm as well as manufacturing method and molding equipment thereof |
| CN102897586A (en) * | 2012-10-26 | 2013-01-30 | 枣庄矿业集团高庄煤业有限公司 | Fast and automatic film rolling machine |
| CN105949485A (en) * | 2015-03-09 | 2016-09-21 | 富士胶片株式会社 | Solution film forming method and facility |
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| CN111490188A (en) * | 2013-10-22 | 2020-08-04 | 株式会社半导体能源研究所 | Secondary battery and electronic device |
| CN114929604A (en) * | 2020-01-14 | 2022-08-19 | 日东电工株式会社 | Contact roll, winding machine, film roll manufacturing system, and film roll manufacturing method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1190942A (en) * | 1997-09-22 | 1999-04-06 | Konica Corp | Method and apparatus for producing cellulose triacetate film |
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- 2002-11-18 CN CNB021513651A patent/CN100418726C/en not_active Expired - Lifetime
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100436710C (en) * | 2005-12-09 | 2008-11-26 | 王盛荣 | Phosphorus-boron paper producing process and apparatus |
| CN102483481A (en) * | 2009-09-14 | 2012-05-30 | 柯尼卡美能达精密光学株式会社 | Method of manufacturing optical film, optical film, deflection plate, and liquid crystal display device |
| CN102483481B (en) * | 2009-09-14 | 2015-04-08 | 柯尼卡美能达精密光学株式会社 | Method of manufacturing optical film |
| CN102096121A (en) * | 2009-12-14 | 2011-06-15 | 富士胶片株式会社 | Polymer membrane, membrane roller and knurling endowing roller |
| CN102096121B (en) * | 2009-12-14 | 2014-11-12 | 富士胶片株式会社 | Polymer membrane, membrane roller and knurling endowing roller |
| CN102537753A (en) * | 2010-12-09 | 2012-07-04 | 鸿富锦精密工业（深圳）有限公司 | Backlight diaphragm as well as manufacturing method and molding equipment thereof |
| CN102537753B (en) * | 2010-12-09 | 2016-05-04 | 鸿富锦精密工业（深圳）有限公司 | Reflection diaphragm and manufacture method thereof and former |
| US10286489B2 (en) | 2010-12-30 | 2019-05-14 | 3M Innovative Properties Company | Apparatus and method for laser cutting using a support member having a gold facing layer |
| TWI576192B (en) * | 2010-12-30 | 2017-04-01 | ３Ｍ新設資產公司 | Apparatus and method for laser cutting |
| CN102897586A (en) * | 2012-10-26 | 2013-01-30 | 枣庄矿业集团高庄煤业有限公司 | Fast and automatic film rolling machine |
| CN111490188A (en) * | 2013-10-22 | 2020-08-04 | 株式会社半导体能源研究所 | Secondary battery and electronic device |
| US11677095B2 (en) | 2013-10-22 | 2023-06-13 | Semiconductor Energy Laboratory Co., Ltd. | Secondary battery and electronic device |
| CN105949485A (en) * | 2015-03-09 | 2016-09-21 | 富士胶片株式会社 | Solution film forming method and facility |
| CN105949485B (en) * | 2015-03-09 | 2020-12-15 | 富士胶片株式会社 | Solution film-making method and apparatus |
| CN114929604A (en) * | 2020-01-14 | 2022-08-19 | 日东电工株式会社 | Contact roll, winding machine, film roll manufacturing system, and film roll manufacturing method |
| CN111351718A (en) * | 2020-03-20 | 2020-06-30 | 河北瑞志交通技术咨询有限公司 | Device and method for detecting bending resistance of road reflective film |
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| CN100418726C (en) | 2008-09-17 |
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