CN104608370A - Roll-to-roll based UV cured polymer film surface microstructure processing system and method - Google Patents
Roll-to-roll based UV cured polymer film surface microstructure processing system and method Download PDFInfo
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Abstract
The invention relates to roll-to-roll based UV cured polymer film surface microstructure processing system and method. The processing system is formed by combining a forward impression apparatus and a reverse impression apparatus in order arrangement; the forward impression apparatus comprises an unreeling device, a coating device, a rolling device, a UV curing device and a winder in order arrangement; the reverse impression apparatus comprises the unreeling apparatus and the winder shared with the forward impression apparatus and independent coating device, rolling device and UV curing device. Two groups of rolling devices are propped against each other, the UV curing devices are respectively used for orderly transferring both sides of the substrate film, exposing and curing; the processing method comprises an unreeling step, a gluing curing step, a protective film pasting step, and a winding step. Compared with the prior art, the optical film two-sided processing in different glue line textures, different structural features and different grain depths can be realized by using the system and method disclosed by the invention.
Description
Technical field
The present invention relates to thin films of polymer material and manufacture field, especially relate to a kind of based on volume to volume UV cure polymer film surface micro-structural system of processing and method.
Background technology
The fine structure that thin films of polymer material is processed different geometric properties can give it with different optical characteristics, such as even light, anti-reflection, reflector lamp etc.Because it has the light attribute being easy to large-scale processing, these bloomings with surface fine structure are widely used in smart mobile phone, notebook computer, panel computer, TV etc. and obtain in display, and due to the development trend of these electronic products be all towards lightening development, indicator screen is also more and more thinner, this just proposes integrated requirement to blooming, multilayer optical performance film is integrated into minority among which floor, to realize saving cost, weight reduction, the object of thinning size.The processing method of effective implemention multilayer film is the direction of optical texture film development.
The continuous shaping method of polymeric film surface fine structure mainly contains the auxiliary imprinting moulding method of volume to volume heat and volume to volume ultra-violet curing imprinting moulding method.
Volume to volume hot-rolling compression technology is by by polymeric material heat temperature raising to a certain extent, then applies pressure make it fill method that type realizes fine structure processing to it.China Patent Publication No. is CN102233634A, name is called preparation device of micro-lens array, invent volume to volume hot stamping device, comprise the appliance arrangement of tensioning apparatus, impression running roller and cooling device, wherein impress running roller and be provided with multiple fire-bar and impression hole, base material and roller platen are taken turns bound fraction and are heated into be inhaled into after soft state through fire-bar and impress in hole.China Patent Publication No. CN102205639A, name is called polymer-extruded micro-embossing forming method, is a kind of hot padding forming method forming micro-nano structure pattern in a few sheet material of polymer.This forming method save a large amount of heating cooling learn the time and energy wanted, Embosser is greatly simplified.Above-mentioned heat assists volume to volume imprint process not need coating, eliminate coating all with degree and the complex control of THICKNESS CONTROL, but, use hot auxiliary process to need to be heated to higher temperature, heat up long with the cooling cycle, affect working (machining) efficiency, simultaneously, the auxiliary impression of heat needs larger pressure, easily causes damage to mould, and then affects Forming Quality.
Ultra-violet curing imprinting moulding method refers to the liquid resin material of UV curable to be coated in equably on base material, mould forces fluent material to fill die surface mold cavity forming with the fine structure on copy mold under less pressure, and the liquid material then utilizing UV-irradiation to fill type makes it solidify and obtains surface fine structure.China Patent Publication No. is CN101843859A, name is called a kind of volume to volume ultraviolet nanometer imprinting apparatus and method, this device is based on transmitting device, apparatus for coating, imprinting apparatus, the feature using precuring and strong cured two curing process to realize fine structure is shaping, but the method can only realize the shaping of one side feature.China Patent Publication No. CN102681082A, name is called light guiding film volume to volume manufacture method and structure thereof, and the method forms two-layer micro-structural its first surface and second successively by utilizing mechanicalness extrusion type in the first optical layers provided.This invention can realize processing minutiae on the two sides of optical layers, but two sides structure is not synchronously carried out, and unreels processing again after needing rolling, and process time is longer.China Patent Publication No. CN101879498A, name is called volume to volume patterning apparatus and has the patterning system of this patterning apparatus, this invention utilizes alignment roller to realize the location of film member in eindruckwerk, thus processes the film member with exact pattern.But the method is also only applicable to the processing and forming of single-sided structure.U.S. Patent number US8027086B2, name is called Roll to Roll NanoimprintLithography, and this invention realizes the processing of the devices such as metal grill polarizer in conjunction with UV curing process and surface metal coating process.Although the method can the various optics of high efficiency processing, this invention is mainly used in processing one side minutiae, is not suitable for the processing and forming of two-sided feature.U.S. Ahn, the people such as S.H [Ahn, S.H.and L.J.Guo (2008). " High-Speed Roll-to-Roll Nanoimprint Lithography on FlexiblePlastic Substrates. " Advanced Materials 20 (11): 2044-2049] adopt the method for volume to volume nanometer ultra-violet curing, on PET base material surface, Continuous maching goes out the little fine structure to 70 nanometers.Taiwan Wu, the people such as J.T [Wu, J.-T.and S.-Y.Yang (2010). " A gasbag-roller-assisted UV imprinting techniquefor fabrication of a microlens array on a PMMA substrate. " Journal of Micromechanicsand Microengineering 20 (8): 085038] method that utilizes gas pressure auxiliary, make pressure distribution in UV curing process evenly, guarantor's type time is longer.But above-mentioned two kinds of equipment all can only complete the optical texture processing of one side.
Summary of the invention
Object of the present invention be exactly in order to overcome above-mentioned prior art exist defect and provide a kind of can realize different glue-line material, different structure feature, different depth of lines the two-sided processing of blooming based on volume to volume UV cure polymer film surface micro-structural system of processing.
Another object of the present invention is that exploitation obtains based on volume to volume UV cure polymer film surface method for processing microstructure.
Object of the present invention can be achieved through the following technical solutions:
Based on volume to volume UV cure polymer film surface micro-structural system of processing, combined by the forward Embosser set gradually and reverse Embosser,
Described forward Embosser comprises the unwinding device, application device, rolling device, ultra-violet curing device, the wrap-up that set gradually,
Described reverse Embosser comprises the unwinding device, the wrap-up that share with forward Embosser, and independently application device, rolling device, ultra-violet curing device,
Two groups of rolling devices abut mutually, utilize respective ultra-violet curing device to carry out transfer printing successively and exposure curing to the tow sides of base film respectively, utilize the feature that reverse UV solidifying pressure is little, and the fine structure that protection forward UV curing molding is good is not destroyed.
Preferably, described unwinding device comprises let off roll, electrostatic eliminating brush and tension force control module; Described application device comprises spray painting assembly and THICKNESS CONTROL roller; Described rolling device comprises roller and rubber roller, the coated mould roller with fine structure pattern in described roller, and described rubber roller is arranged on roller side, coordinates roller by this fine structure imprint patterns on base film to be imprinted; Described ultraviolet curing equipment is UV light source, fills type coating surface carry out ultra-violet curing to roller local; Described wrap-up comprises wind-up roll and tension force control module.
More preferably, described tension force control module comprises idler roller, cylinder, tension force induction installation and control system, described cylinder connects idler roller, idler roller is provided with described tension force induction installation, described control system connects tension force induction installation and cylinder, tension force induction installation responds to the tension force of film to be imprinted transmission when being greater than setting value, control system drives cylinder to drive idler roller to move, loosen the tension force of film to be imprinted transmission, otherwise control system drives cylinder to drive idler roller oppositely movement; Described spray painting assembly comprises the controller that coutroi velocity and coating water dropper move left and right, by coutroi velocity with move left and right speed and control the coating uniformity and thickness; Described ultraviolet curing equipment comprises UV light source and light groove, is realized the control of local solidification energy density by the size controlling the intensity of light source and light line of rabbet joint gap.
Preferably, the present invention also comprises navigation system, this navigation system is provided with film edge sensor and automatic deviation rectifying device, automatic deviation rectifying device is connected on the roll shaft of each roller in from unwinding device to wrap-up, when there occurs skew in film edge sensor sensing to transmitting procedure, automatic deviation rectifying device just controls axial displacement and the level angle displacement of nearlyer roll shaft.
Base film completes the minutiae solidification on two sides successively by forward Embosser and reverse Embosser, forward Embosser and reverse Embosser adopt different materials to complete the blooming processing of different structure feature and different depth of lines.
Described spray painting assembly comprises pipeline and drips glue assembly, slit glue spreading assembly or micro gravure glue spreading assembly, deployed raw material are coated onto in base film or roller by spray painting assembly, control uniformity and thickness by pressure roll or scraper, unnecessary slurry is removed.
Described rubber roller two ends connect cylinder, by the displacement of cylinder fine setting pressure roller, control applied pressure size and uniformity on base film to be imprinted.
Based on volume to volume UV cure polymer film surface method for processing microstructure, comprise and unreel step, gluing curing schedule, pasting protective film step, rolling step, complete the double-edged transfer printing of base film and exposure curing,
The described step that unreels is extracted out continuously from let off roll by base film to be imprinted, and by electrostatic eliminating brush removing film surface electrostatic, control the tensile force in film transmitting procedure by tension force control module;
Described gluing curing schedule adopts following methods:
(1) forward coating
By the spray painting assembly of forward Embosser by paint on base film, and regulate the uniformity of distance controlling coating on base film fabric width of upper and lower two THICKNESS CONTROL rollers;
(2) forward UV solidifies
Coordinate roller that coating extrusion is filled type in the fine structure pattern die cavity in roller by rubber roller, then utilize UV light source to realize the sizing and solidifying of minutiae to partial coating exposure;
(3) reverse coating
In roller, evenly apply one deck liquid material by the coating mechanism of reverse Embosser, and utilize scraper to remove unnecessary coating;
(4) reverse UV solidification
The resin material be coated onto in the die cavity of roller surface is transferred to the one side that base film does not have fine structure, then through UV light source exposure curing, realizes the fine structure processing solidification of reverse side.
Described pasting protective film step sticks two-layer diaphragm by the Optical Coatings Surface of diaphragm device to forming;
Impression is had the film of surface fine structure pattern by wind-up roll rolling by described rolling step;
In forward Embosser, the size of roller surface fine structure pattern between 20-50 μm,
In reverse Embosser, the size of roller surface fine structure pattern is between 1-10 μm.
Described base film is polyester or the acrylate film of thickness 40 μm of-70mm.
Compared with prior art, the present invention is in conjunction with forward impression and reverse imprint process, and the disposable curing molding realizing two-sided minutiae, avoids secondary impression and save time, greatly improve efficiency; Utilize the feature that reverse embossing pressure is little, the fine structure of protection forward impression is not destroyed; Meanwhile, because this processing method adopts different process to carry out UV solidification, the two-sided processing of blooming of different glue-line material, different structure feature, different depth of lines can be realized, and in organization establishes, also there is the advantage of compact conformation.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention in embodiment 1;
Fig. 2 is structural representation of the present invention in embodiment 2;
Fig. 3 is structural representation of the present invention in embodiment 3.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment 1
A kind of based on volume to volume UV cure polymer film surface micro-structural processing unit (plant), its structure as shown in Figure 1, comprise a set of forward Embosser and a set of reverse Embosser, forward Embosser comprises the unwinding device, application device, rolling device, ultra-violet curing device, protective film attaching device, the wrap-up that set gradually; Reverse Embosser and forward Embosser share unwinding device and wrap-up, and in addition, it also comprises independently application device, rolling device, ultra-violet curing device.
Unwinding device comprises let off roll 1, deviation correcting device 3, tenslator 4, drive roll 5; Tenslator 4 is provided with tension force induction installation, control system connects tenslator 4 and responds to film to be imprinted and impress tension force that film transmits when being greater than setting value, control system drives cylinder to drive idler roller to move, loosen the tension force of film to be imprinted transmission, otherwise control system drives cylinder to drive idler roller oppositely movement.
Forward application device comprises coating and stores chamber and drip sebific duct 6, paint thickness and uniformity control roll 7 and a control roll 8, when coating is coated in after on base material, by THICKNESS CONTROL roller 7 and control roll 8 coating is controlled to target thickness and roller compaction roller compaction is even;
The ultra-violet curing device of forward comprises mould roller 10, rubber rollers 9 and ultra-violet curing light source 11, by applying certain pressure to pressure rubber roller 9, by coating extrusion in the die cavity of mould roller 10, then utilizes ultraviolet source 11 to irradiate solidification;
Reverse ultra-violet curing device comprises mould roller 12, slit gluing head 15, scraper 13 and ultra-violet curing light source 14, coating is evenly applied on mould roller 12 via slit glue spreading apparatus 15, scraper 13 is utilized to strike off unnecessary coating, ensure only in die surface die cavity, to leave coating, then by coating being transferred on base material with substrate contact, again uv-exposure solidification is carried out to it, and utilize rubber rollers 16 to carry;
Protective film attaching device comprises diaphragm let off roll 17 and let off roll 18, diaphragm 19 and diaphragm 20, pressure roll 21 and pressure roll 22, upper and lower surface diaphragm let off roll respectively releases two diaphragms, and is pressed to the good blooming surface of curing molding by pressure roll 21 and pressure roll 22;
Wrap-up comprises wind-up roll 24, tension control system 23.Wind-up roll 24 rotates towards the thin polymer film winding direction after pad pasting with suitable line speeds.
Use said apparatus to carry out the polymeric film surface fine structure processing method of solidifying based on volume to volume UV, comprising: unreel, coating, forward UV solidifies, coating, reverse UV solidification, pasting protective film and seven stages of rolling.
Wherein unreel the stage: after impression is opened, the counter-rotation that let off roll 1 is wound around towards base film 2 with suitable line speeds, thus base film 2 is transmitted along fixed course.Exceed predetermined value when tenslator 4 records base film 2 tensile force, control system is adjusting cylinders parameter just, and idler roller is finely tuned to the right, to loosen base film 2, otherwise idler roller is finely tuned left, tensioning base film 2.
The coating stage: coating stores chamber and drips a sebific duct 6 and is coated on base film 2 by deployed slurry, then paint thickness and uniformity control roll 7 and control roll 8 by roll-in by glue to striking off and controlling to target thickness.
Forward UV cure stage: by applying suitable pressure between mould roller 10 and rubber rollers 9, by the coating extrusion that strikes off among the surperficial Flammability limits of mould roller 10, then utilize ultra-violet curing light source 11 to send the ultraviolet light of appropriate power, will the slurry curing of type be filled.
The reverse coating stage: by slit glue spreading apparatus 15, deployed coating is evenly coated onto mould roller 23 surface with suitable speed, and with scraper 13, unnecessary coating is removed, ensure only have coating in die surface die cavity.
Reverse UV cure stage: the other one side coating being applied to mould roller 12 surface being transferred to base film 2, then utilizes ultra-violet curing light source 14 with suitable power curing molding.
In the pasting protective film stage: diaphragm 19 and diaphragm 20 are released through let off roll 17 and let off roll 18, apply certain pressure by pressure roll 21 and pressure roll 22 and diaphragm is attached to tow sides has on the blooming of the fine structure be cured.
The rolling stage: by curing molding well and the optical thin film of coated with protective film by wind-up roll 24 rolling.
Above-mentioned forward solidified surface fine structure pattern is of a size of 50 μm, and reverse solidified surface fine structure pattern is of a size of 10 μm, and the thickness of base film is 120 μm, and its material is polyester (PET, Polyester).
The advantage of the present embodiment is: in conjunction with forward impression and reverse imprint process, the disposable curing molding realizing two-sided minutiae, avoids secondary impression and saves time, greatly improve efficiency; Utilize the feature that reverse embossing pressure is little, the fine structure of protection forward impression is not destroyed; Meanwhile, because this processing method adopts different process to carry out UV solidification, the different coating in two sides can be realized and carry out different structure feature, the blooming processing of different depth of lines; The advantage of compact conformation is also there is in this equipment in organization establishes.
Embodiment 2
As shown in Figure 2, based on case study on implementation 1, move overall for reverse Embosser toward lower left, ensure there is larger cornerite between base material 2 and reverse mould roller 12, increase transfer contact time and guarantor's type time, thus ensure better reverse transferring effect.
Above-mentioned forward solidified surface fine structure pattern is of a size of 30 μm, and reverse solidified surface fine structure pattern is of a size of 5 μm, and the thickness of base film is 80 μm, and its material is polyester (PET, Polyester).
The advantage of present case is: due to moving down of reverse rolling device, makes the Bao Xingjiao having had longer contact Distance geometry larger between reverse mould roller and base material, adds guarantor's type time, better can ensure the Forming Quality of reverse transfer printing.
Embodiment 3
A kind of based on volume to volume UV cure polymer film surface micro-structural processing unit (plant), as shown in Figure 3, comprise a set of forward Embosser and a set of reverse Embosser, forward Embosser comprises the unwinding device, application device, rolling device, ultra-violet curing device, protective film attaching device, the wrap-up that set gradually; Reverse Embosser and forward Embosser share unwinding device and wrap-up, and in addition, it also comprises independently application device, rolling device, ultra-violet curing device.Unwinding device, protective film attaching device and wrap-up are all identical with case study on implementation 1.
Ultra-violet curing device and the case study on implementation 1 of forward are similar, and just rubber rollers 9 has been placed on above mould roller 10, and in case study on implementation 1, rubber rollers 9 is placed in below mould roller 10;
Reverse ultra-violet curing device comprises mould roller 12, nick applicator roll 25, coating case 27, liquid coating 26 and scraper 13, liquid coating 26 is evenly applied on mould roller 12 through nick applicator roll 25, scraper 13 is utilized to scrape off unnecessary coating, ensure only in mold cavity, have coating, then by being transferred on base material by coating with substrate contact, then uv-exposure is utilized to carry out precuring to it;
Above-mentioned forward solidified surface fine structure pattern is of a size of 20 μm, and reverse solidified surface fine structure pattern is of a size of 4 μm, and the thickness of base film is 40 μm, and its material is polyester (PET, Polyester).
The advantage of the present embodiment is: reverse curing module coating coating from below, and be transferred to after on base material can solidify with forward impression simultaneously, share a set of light source, reduce curing light source and arrange, device efficiency is higher, arranges more succinct.
Above three case study on implementation are only the explanation of this volume to volume UV cure polymer film surface micro-structural processing unit (plant) and method, but do not represent the scope that this processing unit (plant) and method are only limitted to above case study on implementation.Several case respectively has its characteristic and advantage above, and wherein, scheme 2 extends guarantor's type time and adds contact, be conducive to the processing and forming of better carrying out fine structure, improve curing molding effect, simultaneously, higher to material use efficiency, saving material, is suggested design of the present invention.
Claims (10)
1., based on volume to volume UV cure polymer film surface micro-structural system of processing, it is characterized in that, this system is combined by the forward Embosser set gradually and reverse Embosser,
Described forward Embosser comprises the unwinding device, application device, rolling device, ultra-violet curing device, the wrap-up that set gradually,
Described reverse Embosser comprises the unwinding device, the wrap-up that share with forward Embosser, and independently application device, rolling device, ultra-violet curing device,
Two groups of rolling devices abut mutually, utilize respective ultra-violet curing device to carry out transfer printing successively and exposure curing to the tow sides of base film respectively.
2. according to claim 1ly to it is characterized in that based on volume to volume UV cure polymer film surface micro-structural system of processing,
Described unwinding device comprises let off roll, electrostatic eliminating brush and tension force control module;
Described application device comprises spray painting assembly and THICKNESS CONTROL roller;
Described rolling device comprises roller and rubber roller, the coated mould roller with fine structure pattern in described roller, and described rubber roller is arranged on roller side, coordinates roller by this fine structure imprint patterns on base film to be imprinted;
Described ultraviolet curing equipment fills type coating surface to roller local and carries out ultra-violet curing;
Described wrap-up comprises wind-up roll and tension force control module.
3. according to claim 2ly to it is characterized in that based on volume to volume UV cure polymer film surface micro-structural system of processing,
Described tension force control module comprises idler roller, cylinder, tension force induction installation and control system, described cylinder connects idler roller, idler roller is provided with described tension force induction installation, described control system connects tension force induction installation and cylinder, tension force induction installation responds to the tension force of film to be imprinted transmission when being greater than setting value, and control system drives cylinder to drive idler roller to move, and loosens the tension force of film to be imprinted transmission, otherwise control system drives cylinder to drive idler roller oppositely movement;
Described spray painting assembly comprises the controller that coutroi velocity and coating water dropper move left and right, by coutroi velocity with move left and right speed and control the coating uniformity and thickness;
Described ultraviolet curing equipment comprises UV light source and light groove, is realized the control of local solidification energy density by the size controlling the intensity of light source and light line of rabbet joint gap.
4. according to claim 2 based on volume to volume UV cure polymer film surface micro-structural system of processing, it is characterized in that, also comprise navigation system, this navigation system is provided with film edge sensor and automatic deviation rectifying device, automatic deviation rectifying device is connected on the roll shaft of each roller in from unwinding device to wrap-up, when there occurs skew in film edge sensor sensing to transmitting procedure, automatic deviation rectifying device just controls axial displacement and the level angle displacement of nearlyer roll shaft.
5. according to claim 1 and 2 based on volume to volume UV cure polymer film surface micro-structural system of processing, it is characterized in that, described forward Embosser and reverse Embosser adopt different materials to complete the blooming processing of different structure feature and different depth of lines.
6. according to claim 2 based on volume to volume UV cure polymer film surface micro-structural system of processing, it is characterized in that, described spray painting assembly comprises pipeline and drips glue assembly, slit glue spreading assembly or micro gravure glue spreading assembly, deployed raw material are coated onto in base film or roller by spray painting assembly, control uniformity and thickness by pressure roll or scraper, unnecessary slurry is removed.
7. according to claim 2 based on volume to volume UV cure polymer film surface micro-structural system of processing, it is characterized in that, described rubber roller two ends connect cylinder, by the displacement of cylinder fine setting pressure roller, control applied pressure size and uniformity on base film to be imprinted.
8. based on volume to volume UV cure polymer film surface method for processing microstructure, comprise and unreel step, gluing curing schedule, pasting protective film step, rolling step, complete the double-edged transfer printing of base film and exposure curing,
The described step that unreels is extracted out continuously from let off roll by base film to be imprinted, and by electrostatic eliminating brush removing film surface electrostatic, control the tensile force in film transmitting procedure by tension force control module;
Described pasting protective film step sticks two-layer diaphragm by the Optical Coatings Surface of diaphragm device to forming;
Impression is had the film of surface fine structure pattern by wind-up roll rolling by described rolling step;
It is characterized in that, described gluing curing schedule adopts following methods:
(1) forward coating
By the spray painting assembly of forward Embosser by paint on base film, and regulate the uniformity of distance controlling coating on base film fabric width of upper and lower two THICKNESS CONTROL rollers;
(2) forward UV solidifies
Coordinate roller that coating extrusion is filled type in the fine structure pattern die cavity in roller by rubber roller, then utilize UV light source to realize the sizing and solidifying of minutiae to partial coating exposure;
(3) reverse coating
In roller, evenly apply one deck liquid material by the coating mechanism of reverse Embosser, and utilize scraper to remove unnecessary coating;
(4) reverse UV solidification
The resin material be coated onto in the die cavity of roller surface is transferred to the one side that base film does not have fine structure, then through UV light source exposure curing, realizes the fine structure processing solidification of reverse side.
9. according to claim 8ly to it is characterized in that based on volume to volume UV cure polymer film surface method for processing microstructure,
In forward Embosser, the size of roller surface fine structure pattern between 20-50 μm,
In reverse Embosser, the size of roller surface fine structure pattern is between 1-10 μm.
10. according to claim 8ly it is characterized in that based on volume to volume UV cure polymer film surface method for processing microstructure, described base film is polyester or the acrylate film of thickness 40 μm of-70mm.
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