CN1928648A - Method of fabricating optical film - Google Patents
Method of fabricating optical film Download PDFInfo
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- CN1928648A CN1928648A CN 200610137141 CN200610137141A CN1928648A CN 1928648 A CN1928648 A CN 1928648A CN 200610137141 CN200610137141 CN 200610137141 CN 200610137141 A CN200610137141 A CN 200610137141A CN 1928648 A CN1928648 A CN 1928648A
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Abstract
A method of fabricating an optical film is provided. The method includes nipping a film composed of a molten polycarbonate resin extruded in a film-forming manner from a die attached to an extruder, between a temperature-preset molding roll having an engraving pattern on the surface thereof and a temperature-preset elastic roll, and thereby transferring the engraving pattern onto the film; and allowing the film having the engraving pattern transferred thereon to travel around the molding roll, and then separating the film from the molding roll. In the method, a preset value of a surface temperature of the molding roll is adjusted within a range of Tg+20 DEG C or above and Tg+45 DEG C or below, where Tg is a glass transition temperature of the film, and a preset value of a surface temperature of the elastic roll is adjusted to Tg or below.
Description
Technical field
The present invention relates to a kind of for example manufacture method of the blooming of liquid crystal indicator that is applicable to.
Background technology
In recent years, more and more higher to the requirement of high briliancy, wide visual angle, high-contrast in liquid crystal indicator, the effect of blooming also becomes important all the more thereupon.Though the manufacture method of blooming has the whole bag of tricks, wherein be well known that extrusion by melting and pressure sintering.
Extrusion by melting is to make blooming by squeezing out behind the molten resin to clamp with a pair of roller the mould on being installed in extruder.Pressure sintering is with the mould with flat surfaces thin slice to be carried out hot pressing by the mould that simultaneously is provided with relief pattern to make blooming.
And in these extrusion by meltings and pressure sintering, in order to improve the optical characteristics of blooming, the temperature to mould when moulding is controlled.As the control method of mold temperature with improve the method for the relief pattern transferring rate of blooming, known have a following method.
In patent documentation 1, put down in writing in extrusion by melting,,, made blooming thus from the T die orifice Yi Bian the resin that will squeeze out with mould roller and squeegee is clamped Yi Bian make the internal temperature of mould roller remain on 150 ℃.
Having put down in writing in pressure sintering in patent documentation 2, is 250 ℃ in mold temperature, and pressure is that 100kg/cm2 kept 15 minutes down, is cooled to normal temperature then, makes blooming thus.
In following patent documentation 3, put down in writing in extrusion by melting, when film that the membranaceous noncrystal thermoplastic resin that squeezes out in by mould constitutes and chill roll are close to, the resin temperature that keeps mould to be right after outlet is more than Tg+130 ℃, and make film temperature be not less than Tg+100 ℃, contact with chill roll up to the film that comes out from mould outlet.
Record in patent documentation 4, metallic casting cylinder with drive with between the roller by in the otpical leaf method for making of metallic endless belt, cast cylinder and driving of metallic is set in respectively below Tg+50 ℃ with the temperature of roller, carry out melt extruded.
No. 3308733 communique of [patent documentation 1] special permission (the 3rd page, [0017] section)
No. 3607759 communique of [patent documentation 2] special permission (the 7th page, [0026] section)
[patent documentation 3] spy opens 2003-185844 communique (the 2nd page, claim 3)
[patent documentation 4] spy opens 2000-280268 communique (the 2nd page, claim 1)
But, in patent documentation 1, in the method for record, exist resin to cause bonding such problem easily because of improving transfer printing.Otherwise,, then reduced transfer printing if reduce the mould roll temperature in order to suppress bonding.That is, in existing method, be difficult to make transfer printing and release property compatibility.
In addition, in patent documentation 2, in the method for record, exist because being reduced to strippable temperature to cause productivity to reduce such problem.In addition, in the method for record, existence is that high temperature causes weak point die life, is difficult to keep the such problem of mechanical precision because of mold temperature in patent documentation 3.In addition, in patent documentation 4 in the method for record, exist because of thermal stress mitigation under near the temperature of the upper limit to cause the problem that shape deterioration is so easily.
According to foregoing, hope has compared with prior art a kind of, can provide to cause that throughput rate is short low die life, and the blooming manufacture method of the high-quality blooming of transfer printing and release property compatibility.
In addition, can be extensive use of polycarbonate resin as the resin material that is suitable for this blooming.Polycarbonate resin is not easy to stick on the forming rolls when the shaping temperature surpasses glass transition point (Tg: about 145 ℃) time at it in nature, and because of can not slyness peel off on film, to have produced and peel off decorative pattern.On the other hand, thus exist and forming temperature to be reduced to also reduced transfer printing when lower and the engraving shape of needs can not to be transferred to problem such on the film accurately than Tg.
Summary of the invention
In view of the above problems, the invention provides a kind of manufacture method of blooming, it can provide a kind of transfer printing and release property compatible and blooming that be made of high-quality polycarbonate resin.
Normally, polycarbonate resin release property rapid deterioration when surpassing its glass transition temperature (Tg).On the other hand, present inventors have found in the high-temperature area higher than Tg and have recovered the temperature range of release property, thereby finish the present invention.
Promptly, the manufacture method of blooming among the present invention, comprise: will from the mould that extruder is installed, push film clamping that the membranaceous molten condition polycarbonate resin that comes out constitutes and be provided with the engraving shape from the teeth outwards and set the forming rolls of temperature and set between the resilient roller of temperature, thereby will carve the operation of shape transferred thereon to the film; With after the film that transfer printing is had the engraving shape is centered around on the forming rolls, the operation of peeling off from forming rolls, when wherein the glass transition temperature of film is Tg, the surface temperature setting value of forming rolls is in the temperature range more than Tg+20 ℃, below the Tg+45 ℃, and the surface temperature setting value of resilient roller is below the Tg.
In the present invention, the surface temperature setting value by forming rolls is in the temperature range more than Tg+20 ℃, below the Tg+45 ℃, and improved the release property of film, peels off decorative pattern by film being sticked on prevented from the forming rolls to produce thus.At this moment, because the surface temperature setting value of resilient roller is below Tg, so the film that has been shaped can not stick on the resilient roller.In addition, under the high resin temperature more than the Tg, carry out the formation of film, so can realize improving the transfer printing precision of engraving shape.
Preferably, carry out peeling off of film between forming rolls and chill roll, described chill roll is connected with this forming rolls via film and has set temperature, and the surface temperature setting value of chill roll is below the Tg.Perhaps, between forming rolls and chill roll, carry out peeling off of film, described chill roll make with this forming rolls for contact condition not and set temperature, the surface temperature setting value that makes chill roll is below the Tg.
In addition, the manufacture method of another blooming among the present invention, comprise: will from the mould that extruder is installed, push film clamping that the membranaceous molten condition polycarbonate resin that comes out constitutes and be provided with the engraving shape from the teeth outwards and set the forming rolls of temperature and set between the resilient roller of temperature, thereby will carve the operation of shape transferred thereon to the film; With after the film that transfer printing is had the engraving shape is centered around on the resilient roller, the operation that strips down from forming rolls, when wherein the glass transition temperature of film is Tg, the surface temperature setting value of forming rolls is in the temperature range more than Tg+20 ℃, below the Tg+45 ℃, and the surface temperature setting value of resilient roller is below the Tg.
In the present invention, the resilient roller clamping film that utilize that surface temperature is set in more than Tg+20 ℃, the forming rolls in the Tg+45 ℃ following temperature range and surface temperature is set in the following temperature of Tg, can prevent to stick on the forming rolls, and can be to the film transfer printing well engraving shape that constitutes by polycarbonate resin.In addition, the surface temperature of resilient roller is set in below the Tg, so can suppress bonding with the film of resilient roller.
By the above,, can carve shape to the transfer printing well of polycarbonate resin adipose membrane, and can suppress the stickup of film according to the present invention.And, can compatible transfer printing and release property.
Description of drawings
Fig. 1 is the stereographic map that an embodiment of the blooming of making according to the blooming manufacture method of the invention process form is shown;
Fig. 2 is a formation embodiment mode chart that is illustrated in the sheet extrusion precision form device that uses in the blooming manufacture method of first example according to the present invention;
The oblique view of a formation embodiment of the sheet extrusion precision form device that Fig. 3 uses in the blooming manufacture method of first example according to the present invention for pattern ground is illustrated in;
Fig. 4 is the enforcement illustration that the time variation of the resin temperature till the polycarbonate resin of the molten condition that extruding from the T die orifice is come out is configured as film is shown;
Fig. 5 to be polycarbonate resin that molten condition is shown change from the time that contacts the forming rolls surface temperature till peeling off with forming rolls one implement illustration;
Fig. 6 is a mode chart that constitutes embodiment that is illustrated in the sheet extrusion precision form device that uses in the blooming manufacture method of second example according to the present invention;
Fig. 7 is a mode chart that constitutes embodiment that is illustrated in the sheet extrusion precision form device that uses in the blooming manufacture method of the 3rd example according to the present invention;
Fig. 8 is the sectional view that the formation of the forming rolls of explanation and resilient roller is shown in embodiments of the present invention.
The explanation of Reference numeral
1.... blooming, 2.... lens ring body, 11.... extruder, 12....T die orifice, 13.... forming rolls, 14.... resilient roller, 15.... chill roll, 16.... guide roller, 21.... roller, 22.... elastic body, 23.... flexible sleeve insert, 24.... chilled water
Embodiment
Below, with reference to the accompanying drawings each example of the present invention is described.And, below in whole accompanying drawings of each example identical or corresponding part represent with identical Reference numeral.
(first example)
Fig. 1 is the stereographic map that an embodiment of the blooming that the blooming manufacture method of first example according to the present invention makes is shown.Overlooking and observing this blooming 1 integral body is rectangle, and it is suitable for makes for example liquid crystal display optical film.
The face (among Fig. 1 following) that comes from the light inlet side of light source in this blooming 1 is the smooth surfaces shape.And the face (above among Fig. 1) that penetrates a side at the light that comes from light source upward is provided with a plurality of continuous symmetrical high order aspheric surface lens ring bodies (perhaps biconvex lens body) 2 along the direction vertical with this aspheric bus.The light that comes from light source in this lens ring body 2 penetrates on the face of a side has a focal length.And as shown in fig. 1, the direction parallel with the column direction of lens ring body 2 is X-axis, and the direction parallel with the generatrix direction of lens ring body 2 is Y-axis, and parallel with the normal direction of blooming 1 is the Z axle.
In addition, the width of lens ring body 2 promptly constitutes cell width D and is selected from the scope that for example 10 μ m are above, 500 μ m are following, for example selects 50 μ m.This blooming 1 is arranged between diffusion thin slice and the liquid crystal panel, makes that the face of the side that for example is provided with a plurality of lens ring bodies 2 is relative with liquid crystal panel.
The XZ section shape of lens ring body 2 is by any one expression in for example following formula (1)～(3).
Z＝X
2/(R+(R
2-(1+K)X
2))+AX
4+BX
5+CX
6+......(1)
Wherein, R is the radius-of-curvature of the tip of lens ring body 2, and K is conic section (コ-ニ Star Network) coefficient, and A, B, C...... are asphericity coefficient.
In addition, in the formula (1), preferred 0＜R＜20 ,-15＜k＜-1,0＜A, B, C ...＜10
-3, perhaps R 〉=0, K＜-1, R-K 〉=5,0＜A＜10
-3, 0≤B, C ...＜10
-3By becoming this numerical range, can improve the directionality and the visual angle of illumination light.
Z＝X
2/(R+(R
2-(1+K)X
2)) (2)
Wherein, R is the radius-of-curvature of the tip of lens ring body 2, and K is conic section (コ-ニ Star Network) coefficient.
And, in formula (2), preferred 0＜R＜50 ,-4＜k＜-1.
Z＝X
2/2R (3)
Wherein, R is the radius-of-curvature of the tip of lens ring body 2.
And, in formula (3), preferred 0＜D/R＜10.
Fig. 2 and Fig. 3 are a mode chart that constitutes embodiment of the sheet extrusion precision form device that uses in the blooming manufacture method that is illustrated in according to the invention process form.This extrusion film precision form device has extruder 11, T die orifice 12, forming rolls 13, resilient roller 14 and chill roll 15.
As the resin material that in the shaping of blooming 1, uses, can use polycarbonate (PC), its glass transition temperature (Tg) is 145 ℃.
Forming rolls 13 constitute have cylindrical shape and with its central shaft as the rotatable driving of turning axle.And forming rolls 13 constitutes and can cool off.Particularly, forming rolls 13 has and is used to make heat eliminating medium to flow to one or more stream of its inside.As heat eliminating medium, for example use oily medium, use to omit illustrated temperature regulator etc. this oil medium for example changed between 120 ℃ to 230 ℃, with the surface temperature of forming rolls 13 be set in more than Tg+20 ℃, in the temperature range below the Tg+45 ℃.
Be provided with engraving shape 13a (Fig. 3) on the face of cylinder of forming rolls 13, be used for fine pattern is transferred to the film (perhaps thin slice) 10 that spues and be shaped from T die orifice 12.This engraving shape for example is transferred to trickle concaveconvex shape (embossing) on the film 10 for being used for the biconvex lens body.For example grinding forms this concaveconvex shape by using adamas to cut the accurate grinding of cutter.In this example, the X-direction of the blooming 1 shown in Fig. 1 forms the engraving shape towards the circumferencial direction of forming rolls 13, and the Y direction of blooming 1 forms the engraving shape towards the short transverse (direction of principal axis) of forming rolls 13.
Can set the surface pressing between forming rolls 13 and the resilient roller 14 arbitrarily.For example rely on the surface pressing adjusting mechanism adjustment forming rolls 13 of the forming rolls 13 1 side application of forces and the surface pressing between the resilient roller 14 by turning axle with resilient roller 14.This surface pressing adjusting mechanism can be made of for example extrusion cylinder, can set surface pressing arbitrarily by the driving force of adjusting this extrusion cylinder.
Next, the blooming manufacture method to first example according to the present invention describes.Fig. 4 shows an embodiment of the time variation of the resin temperature of molten condition polycarbonate resin till being configured as film that extruding is come out from the T die orifice.Fig. 5 shows an embodiment who changes in the time with forming rolls 13 surface temperatures of contacted time of polycarbonate resin.
At first, make the resin material fusion by extruder 11, offer T die orifice 12 then in turn, molten resin continuously spues from T die orifice 12.
Then, during time T 1, the film 10 that the membranaceous molten condition polycarbonate resin that is come out by extruding in the T die orifice 12 with forming rolls 13 and resilient roller 14 crampings (clamping) constitutes.Thus, to the engraving shape 13a of film 10 transfer printing forming rolls 13.
At this moment, as shown in Figure 5, the surface temperature of forming rolls 13 initial sharply heats up contacting with polycarbonate resin, behind the certain hour, is cooled to more than predefined surface temperature Tg+20 ℃, below the Tg+45 ℃ (more than 165 ℃, below 190 ℃).Above-mentioned certain hour is time till film 10 strips down from forming rolls 13 (T1～T2), in this time, make the surface temperature of forming rolls 13 return to the said temperature scope, determine the transfer rate (rotational speed of forming rolls 13) of molten resin temperature, film 10, the roller footpath of forming rolls, the surperficial design temperature of resilient roller 14 etc. thus.And the surface temperature setting value of resilient roller 14 is below the Tg as mentioned above.Temperature to resilient roller 14 is not particularly limited, and for example is more than 20 ℃.
Remain on the said temperature scope by the surface temperature that makes forming rolls 13 and resilient roller 14, can well engraving shape 13a be transferred on the film 10.In addition, during transfer printing engraving shape 13a the temperature (resin temperature among the T1) of film 10 be preferably more than Tg+50 ℃, below the Tg+230 ℃, more preferably more than Tg+80 ℃, below the Tg+200 ℃.Remain on the said temperature scope by the temperature that makes film 10, engraving shape 13a can be transferred on the film 10 well.
After the film 10 that transfer printing is had the engraving shape is centered around on the forming rolls 13, during time T 2, film 10 is stripped down from forming rolls 13 by chill roll 15.In temperature be more than Tg+20 ℃ with this film 10 of this film 10 when forming rolls 13 strips down, below the Tg+45 ℃.The surface temperature of chill roll 15 is set in the following temperature of Tg.The surface temperature of chill roll 15 is set in such scope, and clamps film 10 with forming rolls 13 and chill roll 15 and can suppress to be close to, film 10 can be stripped down from forming rolls 13 well thus.
As mentioned above, in this example, the surface temperature of forming rolls 13 is set in more than Tg+20 ℃, in the temperature range below the Tg+45 ℃.With the surface temperature of forming rolls 13 and resin temperature is same temperature when describing, and under the temperature conditions more than Tg+20 ℃, below the Tg+45 ℃, film 10 is stripped down from forming rolls 13.As shown in Figure 4, belong to high temperature though compare with existing calcining temperature scope (Tg following), there is the temperature range of recovering release property in polycarbonate resin in the high-temperature area higher than Tg.This temperature is more than Tg+20 ℃, the scope below the Tg+45 ℃.Because the transferring rate of the high more shape of resin temperature just improves more, so can realize keeping good film fissility to improve transfer printing precision on the other hand on the one hand.
By the above, make the banded film 10 that transfer printing has the engraving shape 13a on the forming rolls 13.And the film 10 that making is obtained is cut into given size, as shown in fig. 1, makes the blooming 1 that is formed with lens ring 2 on the face of a side thus.
First example according to the present invention can obtain following effect.
Because the surface temperature setting value of forming rolls 13 is more than Tg+20 ℃, the temperature range below the Tg+45 ℃, and the surface temperature setting value of resilient roller 14 is the following temperature range of (more than 20 ℃) Tg, do not peel off decorative pattern so can not paste to produce on forming rolls 13 and the resilient roller 14, can the predetermined film 10 of carving shape be arranged manufacturing accuracy transfer printing well because of film 10.
In addition, because the surface temperature setting value of chill roll 15 is below the Tg, so till the film cooling, can both suppress change of shape.Further, because between forming rolls 13 and the chill roll 15 that is connected by film 10, carry out peeling off of film 10,, so film 10 successfully can be stripped down from forming rolls 13, and can be suppressed at effectively to produce on the film 10 and peel off decorative pattern.Further, can suppress film 10 and produce fluctuating.
(second example)
Next, second example of the present invention is described.
Fig. 6 is a mode chart that constitutes embodiment that is illustrated in the sheet extrusion precision form device that uses in the blooming manufacture method of second example according to the present invention.In this example, as shown in Figure 6, be arranged between forming rolls 13 and the chill roll 15 and keep at a certain distance away, forming rolls 13 and chill roll 15 are contactless state, thus film are stripped down from forming rolls 13.
Other formations except that above-mentioned are all identical with first example.By this example, also can realize the same compatible fissility with above-mentioned first example and transfer printing.
(the 3rd example)
Next, the 3rd example of the present invention is described.
Fig. 7 is a mode chart that constitutes embodiment of the sheet extrusion precision form device that uses in the blooming manufacture method that is illustrated in according to the 3rd example of the present invention.This sheet extrusion precision form device has extruder 11, T die orifice 12, forming rolls 13, resilient roller 14 and guide roller 16.
In the 3rd example of the present invention, as shown in Figure 7, after centering on film 10 on resilient roller 14, between resilient roller 14 and guide roller 16, carry out peeling off of film 10.Guide roller 16 constitutes to have cylindrical shape and is the rotatable driving of turning axle with its central shaft.Guide roller 16 is configured to and resilient roller 14 relative spacing certain distances.In addition, guide roller 16 constitutes and can cool off.Particularly, guide roller 16 has and is used to make heat eliminating medium to flow to one or more stream of its inside.As heat eliminating medium, make water or oil.
Other formations except that above-mentioned are identical with equal first example.By this example, also can obtain and the same action effect of above-mentioned first example.Especially,, on film 10, can not produce and peel off decorative pattern, be fit to the manufacturing of film simultaneously according to example of the present invention.
[embodiment]
Below, by embodiment the present invention is done to specify, but the present invention has more than and is confined to these embodiment.
Below, as shown in Figure 2, make forming rolls 13 and cooling tube 15 contacted roll shapes be called Class1 via film 10.In addition, as shown in Figure 6, forming rolls 13 and chill roll 15 are kept at a distance, and become the roll shape of unclamping at film 10 after forming rolls 13 strips down and are called type 2.Further, as shown in Figure 7, after forming rolls 13 and resilient roller 14 were clamped film 10, the roll shape that film 10 is wound up on resilient roller 14 sides was called type 3.
In addition, in embodiment 1～3 and the comparative example 1,2, as roll shape, the surface temperature of resilient roller 14 remains certain design temperature with Class1, changes the surface temperature setting value of forming rolls 13.In embodiment 4,5 and comparative example 3,4, as roll shape, the surface temperature of forming rolls 13 remains certain design temperature with Class1, changes the surface temperature setting value of resilient roller 14.In embodiment 6,7, the surface temperature of forming rolls 13 and resilient roller 14 remains certain design temperature, and type 2, type 3 are used separately as roll shape.In the comparative example 5, Class1 as roll shape, is changed the surface temperature setting value of chill roll 15.
(embodiment 1)
At first, the extrusion film precision form device that uses in the related sample making of each embodiment and comparative example is described.Fig. 8 illustrates the formation sectional view of forming rolls 13 and resilient roller 14.
And as elastic body 22, using rubber hardness is the nitrile butadiene rubber (NBR) of 85 degree, and its thickness is 20mm.In addition, the diameter of resilient roller 14 is 260mm, and face length (width of resilient roller 14) is 450mm.
Forming rolls 13 be configured to heat eliminating medium by many streams in internal flow and can reduce Temperature Distribution.Under S 45C,, carry out mirror polish (0.5S is following), carry out plated by electroless plating NiP (nickel, phosphorus) (thickness is 100m) then and handle the material Q-tempering.
In addition, the engraving shape that is arranged on the face of cylinder of forming rolls 13 forms in the following way.At first, on the super precision lathe that places in constant temperature and humidity (23 ℃ of temperature, the humidity 50%) room, the diamond cutter (opening angle is 92 °, has the R shape on the summit) with reservation shape is set.So the spacing formation degree of depth with 90 μ m on the circumferencial direction of forming rolls is the ditch of 60 μ m.Between opening angle was 92 ° paddy, the tip portion between this paddy formed the R shape in the ditch.In addition, the diameter of this forming rolls 13 is 300mm, and face length is 460mm, and the width of ditch machining area is 300mm.
Heat eliminating medium as forming rolls 13 uses oily medium.Heat eliminating medium as resilient roller 14 and chill roll 15 makes water, the temperature of using pressurization warm water type temperature regulator to regulate heat eliminating medium.
The extrusion film precision form device that use has above-mentioned formation carries out the shaping of blooming.
At first, under undried situation, from T die orifice 12, extrude polycarbonate E2000R (engineering plastics society of Mitsubishi system).And, after clamping, be wound up on the forming rolls 13 with forming rolls 13 and resilient roller 14.And the surface temperature setting value of forming rolls 13 is Tg+35 ℃, and the surface temperature setting value of resilient roller 14 is 75 ℃.
Then, thin slice is stripped down from forming rolls 13 by chill roll 15.And the surface temperature setting value of chill roll 15 is 115 ℃.In addition, the speed of traction engine is 7m/min.Thus, obtaining on an interarea transfer printing, the thickness of ditch is arranged is the blooming of 220 μ m.
Contact with sensor on the roller surface of above-mentioned forming rolls 13 and resilient roller 14, measure the surface temperature of forming rolls 13 and resilient roller 14 on the position before being difficult to be subjected to the clamping of resin heat affecting.In addition, the surface of chill roll 15 is contacted with sensor, on the position of clamping film by this chill roll 15 and forming rolls 13, measure the surface temperature of this chill roll 15.And, use portable digital thermometer (チ ノ-society's system, trade name: ND511-KHN), use surface temperature to measure as thermometer with sensor (the upright gauging instrument society of peace system, trade name U-161K-00-D0-1) as sensor.
(embodiment 2)
Except the surface temperature setting value of forming rolls 13 was Tg+20 ℃, additive method was identical with the foregoing description 1, obtains blooming thus.
(embodiment 3)
Except the surface temperature setting value of forming rolls 13 was Tg+45 ℃, additive method was identical with the foregoing description 1, obtains blooming thus.
(comparative example 1)
Except the surface temperature setting value of forming rolls 13 was Tg+50 ℃, additive method was identical with the foregoing description 1, obtains blooming thus.
(comparative example 2)
Except the surface temperature setting value of forming rolls 13 was Tg+15 ℃, additive method was identical with the foregoing description 1, obtains blooming thus.
(embodiment 4)
Except the surface temperature setting value of resilient roller 14 was 20 ℃, additive method was identical with the foregoing description 1, obtains blooming thus.
(embodiment 5)
Except the surface temperature setting value of resilient roller 14 was Tg-10 ℃, additive method was identical with the foregoing description 1, obtains blooming thus.
(comparative example 3)
Except the surface temperature setting value of resilient roller 14 was 10 ℃, additive method was identical with the foregoing description 1, obtains blooming thus.
(comparative example 4)
Except the surface temperature setting value of resilient roller 14 was Tg+10 ℃, additive method was identical with the foregoing description 1, obtains blooming thus.
(embodiment 6)
Draw back certain distance except constituting between forming rolls 13 and the chill roll 15, for carrying out under the contactless state outside the peeling off of blooming, additive method is identical with the foregoing description 1, obtains blooming thus at forming rolls 13 and chill roll 15.
(embodiment 7)
Possess guide roller 16 and replace chill roll 15, after centering on resilient roller 14, carry out peeling off of film between resilient roller 14 and guide roller 16, in addition additive method is identical with the foregoing description 1, obtains blooming thus.
(comparative example 5)
Except the surface temperature setting value of chill roll 15 was Tg+10 ℃, additive method was identical with the foregoing description 1, obtains blooming thus.
Transfer printing, release property and planarity to blooming in the embodiment 1～7 that obtains as mentioned above and the comparative example 1～5 are estimated.Table 1 illustrates the evaluation result of transfer printing, release property and the planarity of blooming in embodiment 1～7 and the comparative example 1～5.
Table one
| Forming rolls | Resilient roller | Chill roll | Roll shape | Transfer printing | Release property | Rise and fall | |
| | Tg+35℃ | 75℃ | 115℃ | Class1 | ○ | ○ | ○ |
| Embodiment 2 | Tg+20℃ | 75℃ | 115℃ | Class1 | ○ | ○ | ○ |
| Embodiment 3 | Tg+45℃ | 75℃ | 115℃ | Class1 | ○ | ○ | ○ |
| Comparative example 1 | Tg+50℃ | 75℃ | 115℃ | Class1 | △ | × | × |
| Comparative example 2 | Tg+15℃ | 75℃ | 115℃ | Class1 | △ | × | × |
| Embodiment 4 | Tg+35℃ | 20℃ | 115℃ | Class1 | ○ | ○ | ○ |
| Embodiment 5 | Tg+35℃ | Tg-10℃ | 115℃ | Class1 | ○ | ○ | ○ |
| Comparative example 3 | Tg+35℃ | 10℃ | 115℃ | Class1 | ○ | ○ | △ |
| Comparative example 4 | Tg+35℃ | Tg+10℃ | 115℃ | Class1 | ○ | × | × |
| Embodiment 6 | Tg+35℃ | 75℃ | 115℃ | Type 2 | ○ | △ | × |
| Embodiment 7 | Tg+35℃ | 75℃ | ... | Type 3 | ○ | ○ | △ |
| Comparative example 5 | Tg+35℃ | 75℃ | Tg+10℃ | Class1 | ○ | × | × |
Below, the evaluation method of transfer printing, release property and the planarity of blooming is specifically described.
[the transfer printing evaluation of film]
Utilize ミ Star ト ヨ system roughness integrator (SJ201) to measure the phacoid height of blooming in embodiment and the comparative example.With the degree of depth of the ditch that forms on the phacoid height h of this blooming that is measured to and the forming rolls 13 be d situation about equating as transferring rate 100%, the phacoid height h that calculates blooming with respect to the ratio of the depth d of the ditch of formation on the forming rolls 13 as transferring rate.Particularly, according to transferring rate=(h/d) * 100 calculate transferring rate.And, according to the transfer printing of the following evaluated for film of transferring rate that calculates.
Zero: transferring rate is more than 90%
△: transferring rate is less than more than 90%～70%
*: transferring rate is less than 70%
[the release property evaluation of film]
Blooming peel off (demoulding) variation the time, on blooming, produce and peel off bad decorative pattern (the bad decorative pattern of the demoulding).In view of the above, whether produce bad decorative pattern on the blooming by visual judgement embodiment and comparative example, according to this result of determination, following evaluation release property.
Zero: do not produce and peel off bad decorative pattern
△: peel off bad decorative pattern (little) a little less than the generation to the optical characteristics influence
*: produce and peel off bad decorative pattern (big) by force the optical characteristics influence
[the planarity evaluation of film]
Blooming is carried out linear light radiation, judge that deflection does not only take place the straight line of reflection, according to this result of determination, following evaluation planarity.
Zero: do not produce rise and fall (deflection)
△: only produce little by little rise and fall (deflection) (little) to the optical characteristics influence
*: produce very big fluctuating (deflection) (big) to the optical characteristics influence
Can know following content by table 1.
By the surface temperature setting value that makes forming rolls 13 be more than Tg+20 ℃, temperature range below the Tg+45 ℃, the surface temperature setting value that makes resilient roller 14 is more than 20 ℃, below the Tg, and then the surface temperature setting value that makes chill roll 15 is below the Tg, can compatible transfer printing and release property and obtain good planarity.
More than, each example of the present invention is illustrated, but the present invention is not limited to this beyond any doubt, can carry out various distortion according to technological thought of the present invention.
Even be not that numerical value cited in for example above-mentioned each example was not can use the numerical value different with it as required yet.
In addition, though in above each example, the situation that lens ring body 2 is set on otpical leaf 1 is illustrated, but the shape that is arranged on the phacoid on the otpical leaf 1 is not limited to this example, for example triangular prism etc. can be set on otpical leaf.
In addition, though in above each example, be that the situation of smooth surfaces shape is that example is illustrated with the face of the light inlet side that comes from the blooming light source, but, for example also can the projection decorative pattern that be various concaveconvex shapes or regulation roughness be set by wrinkle processing for this face.Thus, can prevent the generation etc. of visual photoelectricity pattern, the inhomogeneity that between light guide plate, causes light source light and interference light to light guide plate.And, wrinkle processing is carried out on the surface of resilient roller be transferred to this method on the film thereby the formation of above-mentioned wrinkle face is adapted to pass through, by this method, can carry out the formation of lens face and the formation of wrinkle face simultaneously.
Claims (6)
1, a kind of manufacture method of blooming comprises:
To from the mould that extruder is installed, push film clamping that the membranaceous molten condition polycarbonate resin that comes out constitutes be provided with the engraving shape from the teeth outwards and set the forming rolls of temperature and set between the resilient roller of temperature, with the operation of described engraving shape transferred thereon to the described film; And
After the film that transfer printing is had described engraving shape was centered around on the described forming rolls, the operation from described forming rolls is peeled off is characterized in that:
When the glass transition temperature of described film was Tg, the surface temperature setting value of described forming rolls was in the temperature range more than Tg+20 ℃, below the Tg+45 ℃, and the surface temperature setting value of described resilient roller is below the Tg.
2, according to the manufacture method of the blooming of claim 1, it is characterized in that, carry out peeling off of described film between described forming rolls and chill roll, described chill roll contacts and has set temperature via described film with this forming rolls, and the surface temperature setting value that makes described chill roll is below the Tg.
3, according to the manufacture method of the blooming of claim 1, it is characterized in that, carry out peeling off of described film between described forming rolls and chill roll, described chill roll and this forming rolls are for contact condition not and set temperature, and the surface temperature setting value that makes described chill roll is below the Tg.
According to the manufacture method of the blooming of claim 1, it is characterized in that 4, when described forming rolls is peeled off described film, the temperature of this film is more than Tg+20 ℃, below the Tg+45 ℃.
5, a kind of manufacture method of blooming comprises:
The film that will constitute by the membranaceous molten condition polycarbonate resin that extruding in the mould of installing on the extruder is come out be clamped in the surface be provided with the engraving shape and set the forming rolls of temperature and set between the resilient roller of temperature, with the operation of described engraving shape transferred thereon to the described film; And
After the film that transfer printing is had described engraving shape was centered around on the described resilient roller, the operation from described resilient roller is peeled off is characterized in that:
When the glass transition temperature of described film was Tg, the surface temperature setting value of described forming rolls was in the temperature range more than Tg+20 ℃, below the Tg+45 ℃, and the surface temperature setting value of described resilient roller is below the Tg.
6, according to the manufacture method of the blooming of claim 5, it is characterized in that carry out peeling off of described film between described resilient roller and guide roller, described guide roller and this resilient roller keep at a certain distance away and be configured.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005256709 | 2005-09-05 | ||
| JP256709/05 | 2005-09-05 | ||
| JP212079/06 | 2006-08-03 |
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| CN1928648A true CN1928648A (en) | 2007-03-14 |
| CN100437260C CN100437260C (en) | 2008-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006101371413A Expired - Fee Related CN100437260C (en) | 2005-09-05 | 2006-09-05 | Method of fabricating optical film |
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| CN (1) | CN100437260C (en) |
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