CN100354110C - Unit and process for the production of tubular resin film - Google Patents

Abstract

A manufacturing apparatus is provided for manufacturing a tubular resin film of high quality and little thickness variations, which is stretched and given an orientation, and suitable as retardation film or the like. It comprises a stretching section ( 6 ) for stretching the tubular resin film ( 20 ), and a maintaining section ( 7 ) for maintaining a shape of said tubular resin film ( 20 ) stretched. Further, said stretching section ( 6 ) is arranged to apply a stretching force to said tubular resin film for longitudinally and/or circumferentially stretching said tubular resin film ( 20 ).

Description

The manufacturing installation of tubular resin film

Technical field

The present invention relates to the thermoplastic resin is the manufacturing installation and the manufacture method of tubular resin film of raw material.In more detail, the present invention relates to be used in phase-contrast film, shrinkable film, laminated film etc., thickness is little and the manufacturing installation and the manufacture method of even, as to have smooth surface tubular resin film.

Background technology

So far, carried out a large amount of relevant thermoplastic resin membranes' research and development by a lot of researchers, enterprise etc.And the thermoplastic resin membrane, because its cost of material is cheaper, and excellences such as mechanical performance, anti-medicine, the transparency, water vapo(u)r transmission, so the field of use spreads all over scope widely such as packing, groceries, agricultural, industry, food, medical treatment.

Thermoplastic resin membrane's example has appearred much utilizing in optical field in recent years.Thermoplastic resin (for example Merlon, cyclic polyolefin etc.), transmitance is relatively good, and when carrying out stretch processing (uniaxial tension or biaxial stretch-formed), can give optic anisotropy (orientation).By the film that this thermoplastic resin that is endowed orientation is made, the phase-contrast film of use in can being suitable for waiting as LCD (LCD).

In addition, known so far and implementing to be used to make this thermoplastic resin membrane's the whole bag of tricks.As thermoplastic resin membrane's manufacture method, generally in industrial employing: the resin solution of resin dissolves in solvent will be poured on glass plate etc. and the solution casting method (for example with reference to the flat 5-239229 communique of TOHKEMY) of film forming; Utilize after extruder extrudes molten resin, utilize chilled roll to cool off and the T-mould extrusion molding (for example with reference to TOHKEMY 2000-219752 communique) of filming; The pipe extrusion molding (for example with reference to the clear 59-120428 communique of TOHKEMY) that utilizes extruder that molten resin is extruded in a tubular form; At the inflation extrusion molding (for example with reference to the clear 60-259430 communique of TOHKEMY, the flat 8-267571 communique of TOHKEMY) that when air pressure is given in the inboard of the resin of extruding in a tubular form, is shaped etc.

But the thermoplastic resin membrane's of above-mentioned prior art manufacture method exists various problems.For example, the solution casting method, owing to use solvent, so exist the complicated and sweeping shortcoming of whole device, this becomes the main cause that manufacturing cost rises.As bigger problem,,, run counter to the trend of current environmental protection so strengthen burden to environment because the solution casting method is used a large amount of solvents.

In addition, T-mould extrusion molding is same, because being on a grand scale of device so need the big area that is provided with, exists the also very high problem of the price of device own on this basis.And, in T-mould extrusion molding, in the time will dwindling film thickness, because the deterioration of film end portion thickness precision, so the discarded film end of having to, thus exist the low problem of fabrication yield.

In addition, the film that utilizes T-mould extrusion molding to make, general using stenter mode stretches.In the stenter mode,,, can only utilize the central portion of film so the fluctuating of the slow axis angle of end increases owing to use the end of clip clamping film.

On the other hand, the pipe extrusion molding, because can the constituent ratio small device, fabrication yield is also fine, so in the field that resin film is shaped, the past extensively adopts.In addition, the pipe extrusion molding can obtain the thin mould of resin with the shape of tubulose, as long as the resin film of this tubulose utilized cutter sweep such as roll-type cutting machine cut along its length, just can make the very wide resin film of width.But, utilizing this existing pipe extrusion molding, the resin film that stably obtains certain mass is extremely difficult.This is because the resin of extruding in a tubular form from extruder is unsettled, is easy to be subjected to the influence of external environment condition, and its shape is easy to change.So, utilize the pipe extrusion molding stably to make to can be used in phase-contrast film etc., thickness is little and even, as to have smooth surface resin film goods hardly may.

The inflation extrusion molding be a kind of with molten resin after extruder is extruded in a tubular form, method at shaping resin film when the resin inboard is blown into air, but in the method also with top described the same, unstability owing to the resin of extruding in a tubular form from extruder, by the variation of only small membrane tension or the turbulent flow of air-flow, on film, produce wrinkling, lax, fluctuation etc. at an easy rate.Like this, in the inflation extrusion molding, still there not be solution to be difficult to stably to make that thickness is little and even, the problem of resin film goods with smooth surface.

Owing to the inhomogeneities of the film thickness that utilizes existing pipe extrusion molding, inflation extrusion molding to make is big, so, be not suitable for phase-contrast film etc.

So the present invention is in view of the above problems and proposes, its objective is the manufacturing installation of the tubular resin film that a kind of be suitable for phase-contrast film high-quality, that thickness offset is little that is endowed orientation by stretching etc. is provided.

Disclosure of an invention

In the tubular resin apparatus for manufacturing thin film of the present invention, it is characterized in that, comprise: extension section, it has mandrel, this mandrel is for the tubulose resin film that stretches, relative with above-mentioned tubulose resin film to whole surface be provided with the hole portion that can ooze out gas internally to above-mentioned tubular resin film surface; The shape of the above-mentioned tubulose resin film that maintaining part, its maintenance have been stretched.

In the tubular resin apparatus for manufacturing thin film of this structure, owing to utilize extension section with the tubular resin film stretching, then be maintained fixed the shape of this film that has been stretched in maintaining part, so, after stretching, common contraction etc. can not take place on the tubular resin film.Gauffer, lax, fluctuation etc. can not take place in this tubular resin film, can make thickness offset, little, the high-quality resin film goods of phase difference inhomogeneities.

In tubular resin apparatus for manufacturing thin film of the present invention, above-mentioned extension section can be given the tensile force of the above-mentioned tubulose resin film that stretches in the longitudinal direction to above-mentioned tubulose resin film.

According to this structure, owing to can on the length direction of film, give orientation by stretching tubulose resin film, so, can make the phase-contrast film of use in waiting as LCD (LCD) and suitable tubular resin film.Gauffer, lax, fluctuation etc. can not take place in this tubular resin film, can be used as thickness offset, high-quality resin film goods that the phase difference inhomogeneities is little.

In tubular resin apparatus for manufacturing thin film of the present invention, above-mentioned extension section can be given the tensile force of the above-mentioned tubulose resin film that stretches in a circumferential direction to above-mentioned tubulose resin film.

According to this structure, owing to can on the circumferencial direction of film, give orientation by stretching tubulose resin film, so, can make the phase-contrast film of use in waiting as LCD (LCD) and suitable tubular resin film.Gauffer, lax, fluctuation etc. can not take place in this tubular resin film, can be used as thickness offset, high-quality resin film goods that the phase difference inhomogeneities is little.

In tubular resin apparatus for manufacturing thin film of the present invention, above-mentioned extension section can have the mandrel that is made of porous material.

As this structure, if the mandrel of extension section is a porous material, owing to can similarly ooze out gas from its surface, so, almost there is not the part of gas seepage discharge to rise and fall.Thereby, owing to further improve the untouchable of tubular resin film and extension section, so, can not cause damage, shape of stripes etc. to the film inner surface, can obtain more smooth, smooth high-quality film.Gauffer, lax, fluctuation etc. can not take place in this tubular resin film, can make the little high-quality resin film goods of thickness offset.And, owing to, reduce the resistance when stretching by improving the untouchable of tubular resin film and extension section, so, can utilize extension section successfully to carry out stretching process.

In tubular resin apparatus for manufacturing thin film of the present invention, above-mentioned extension section also can be Splittable expanded in diameter mandrel, and this Splittable expanded in diameter mandrel may be partitioned into a plurality of parts, and each of above-mentioned a plurality of parts can move in the radial direction.

As this structure, be Splittable expanded in diameter mandrel by making extension section, utilize single mandrel, can make tubular resin film with various stretching ratios.In addition, Splittable expanded in diameter mandrel not only moves when the off-line state of the operation of not carrying out the tubular resin film, and also can move in stretching process, so, can in operation process, carry out the fine setting of thin film fabrication condition.Thus, tubular resin film of the present invention can become more high-quality resin film goods.

In tubular resin apparatus for manufacturing thin film of the present invention, above-mentioned maintaining part can be made of porous material.

As this structure, be porous material by making maintaining part, because can be so that from its surface, similarly ooze out gas, so, almost there is not the part of gas seepage discharge to rise and fall.Thereby, further improve the untouchable of tubular resin film and maintaining part, so, can on the film inner surface, not cause damage and bar shape etc., can obtain more smooth, smooth high-quality film.Gauffer, lax, fluctuation etc. can not take place in this tubular resin film, can become thickness offset, high-quality resin film goods that the phase difference inhomogeneities is little.

In tubular resin apparatus for manufacturing thin film of the present invention, in above-mentioned maintaining part, the tubular resin film can be cooled off.

According to this structure, owing to utilize extension section, then in cooling, be maintained fixed the shape of this film that has stretched in maintaining part with the tubular resin film stretching, so, after the stretching, common contraction etc. does not take place on the tubular resin film.Gauffer, lax, fluctuation etc. can not take place in this tubular resin film, can become thickness offset, high-quality resin film goods that the phase difference inhomogeneities is little.

Tubular resin apparatus for manufacturing thin film of the present invention also can be provided with the air-breather of the pipe internal pressure rising usefulness that prevents above-mentioned tubulose resin film.

According to this structure, owing to can utilize air-breather to adjust the inside and outside pressure of tubular resin film, so, the tubulose resin film can not take place to expand or shrink condition of enlarged repeatedly to foreign side, can keep the flatness of good film.Gauffer, lax, fluctuation etc. can not take place in this tubular resin film, can become thickness offset, high-quality resin film goods that the phase difference inhomogeneities is little.

Tubular resin apparatus for manufacturing thin film of the present invention also can have the preheating part with the above-mentioned tubulose resin film preheating before stretching.

According to this structure, with the preheating of tubular resin film, can change preheat temperature by preheating part, so, can be in extension section in suitable temperature range with the tubular resin film stretching.Gauffer, lax, fluctuation etc. can not take place in this tubular resin film, can become thickness offset, high-quality resin film goods that the phase difference inhomogeneities is little.

The simple declaration of accompanying drawing

Fig. 1 is the sketch of an example of expression tubular resin apparatus for manufacturing thin film of the present invention;

Fig. 2 is the sketch of an example of the formation of expression separation portion that stabilizing device is provided with as the spout that adds hot extruder is separated with core component;

Fig. 3 is that expression is with the sketch of stabilizing device as an example of the formation of second core component that oozes out gas from the surface;

Fig. 4 is that expression is with the sketch of stabilizing device as two examples of thermostatic formation;

Fig. 5 is that expression is with the sketch of stabilizing device as an example of the formation of the anti-locking mechanism of air-flow;

Fig. 6 is spout (a) stereogram, (b) cutaway view, and the amplification view of peristoma portion (c);

Fig. 7 is the sketch of example of the spout of the nozzle of expression with enlarged-diameter;

Fig. 8 is the part enlarged drawing with tubular resin apparatus for manufacturing thin film of outer member;

Fig. 9 is the sketch of expression as the tubular resin apparatus for manufacturing thin film of the other form of implementation of the present invention;

Figure 10 is the sketch of an example of expression Splittable expanded in diameter mandrel;

Figure 11 is the partial enlarged drawing of an example of the tubular resin apparatus for manufacturing thin film of the present invention of the expression air-breather that is provided with the inside and outside big pneumatolytic connected state that makes the tubular resin film;

Figure 12 is the upward view of the tubular resin apparatus for manufacturing thin film of the device to be cut cutting of expression tubular resin film and the situation launched;

Figure 13 is (a) sketch and (b) upward view of the part of expression tubular resin apparatus for manufacturing thin film of the present invention that two cutter sweeps are set.

The best mode that carries out an invention

Form of implementation of the present invention is described down with reference to the accompanying drawings.In addition, the present invention is not limited to the structure that following form of implementation and accompanying drawing are put down in writing.

Fig. 1 is the sketch of an example of expression tubular resin apparatus for manufacturing thin film 100 of the present invention.

Tubular resin apparatus for manufacturing thin film 100 comprises and adds hot extruder 1 and core component 2.From hopper 1a thermoplastic resin is put into and to be added in the hot extruder 1.Input thermoplastic resin is heated fusion along with moving in cylinder 1b.At this moment,, then preferably will replace in the cylinder 1b with inert gas as required, perhaps carry out degasification if thermoplastic resin is the resin of easy oxidation.In addition, preferably add hot extruder 1 and can regulate resin extruded amount, the pressure adjustmenting mechanism (not shown) that the extrusion pressure of adjusting molten resin is used also can be set.

Add hot extruder 1 as what use in the present invention, for example suitably use such extruder, promptly, ccontaining screw rod 1c is full thread (Off Le Off ラ イ ト) single-shaft variant screw rod in cylinder 1b, L/D=20～30 (here, L represents spiro rod length, and D represents screw diameter), cylinder 1b is divided into 3 zones along the direct of travel of thermoplastic resin, and adjustment can be carried out in each zone.

In addition, add hot extruder 1 and have the spout 3 that the thermoplastic resin of fusion is extruded in a tubular form.Here, spout 3 in this manual, is meant thermoplastic resin is directly extruded member on the leading section that being installed in of usefulness add hot extruder 1, but be not limited to this structure, for example, also can make with spout 3 with add hot extruder 1 incorporate structure.In addition, spout 3 is provided with the stream 3a with annular cross section of molten resin by usefulness.The resin extruded amount that this stream 3a is designed to unit are is uniform on whole annular cross section.It is that 300mm constitutes that stream 3a for example can make its bore.In addition, because when on the wall of stream 3a, having concavo-convex or during damage etc., after produce unsafty strip shape etc. on the surface of the tubular resin film that generates, so, make the wall of stream smooth as much as possible preferably by implementing milled processed etc.In addition, the Temperature Influence that is subjected to spout 3 owing to the extrusion capacity of molten resin produces deviation, so preferably utilize the temperature control equipment (not shown) critically to control the temperature of spout 3.The tubular resin film that obtains according to the present invention by the temperature of spout 3 is mediated from glass transformation temperature (Tg)+20 ℃ to glass transformation temperature (Tg)+80 ℃, can make it to be orientated when extruding.The temperature of spout 3 than (Tg)+20 ℃ low situation under because the viscosity of resin rises, the filming of the back difficulty that becomes, on the other hand, the temperature of spout 3 than (Tg)+80 ℃ high situation under owing to constitute the relaxation of the molecule of resin, becoming is difficult to orientation.The more preferably scope of the temperature of spout 3 is between (Tg)+30 ℃ to (Tg)+50 ℃.

In addition, preferably spout 3 is designed to, when the width of the stream 3a of spout 3 was d, flow path width d satisfied following formula (1) with the relation of the thickness t of the thermoplastic resin that is extruded:

t＜d＜20t (1)

By satisfying such condition, can prevent the situation of the periodic thickness fluctuating (draw resonance) of film.

In addition, if spout 3 is to add the mode that hot extruder is connected, various kinds of resin is confluxed constitute in spout 3 with a plurality of, can make the tubular resin film with sandwich construction.

Core component 2 with the interior table of the thermoplastic resin of extruding in a tubular form from the spout 3 that adds hot extruder 1 and relative to mode dispose, with thermoplastic resin formed be tubular resin film 20.Core component 2 is connected with the gas supply source (not shown), as shown in the amplification circle P of Fig. 1, when being shaped, because the friction that thermoplastic resin and contacting of core component 2 cause, can ooze out gas by the inner surface to thermoplastic resin from the surface of core component 2 in order to reduce.From the gas that the surface of this core component 2 is oozed out, its temperature and seepage discharge can be regulated according to the kind of thermoplastic resin, and this can reach by not shown temperature-adjusting device and pressure-regulating device.In addition, preferred core component 2 is implemented fluorine coating etc. in its surface, even make just in case contacted with thermoplastic resin when being shaped, also excessive friction can not take place.And then the upper surface of core component 2 (face that adds hot extruder 1 side) is not in order to ooze out gas from this, preferably by coverings such as metallic plate, metal forming, plating processing.

In addition, between spout 3 that adds hot extruder 1 and core component 2, be provided with the stabilizing device 4 that the dimensionally stable that makes the thermoplastic resin of extruding is in a tubular form used.Because the thermoplastic resin after just having extruded in a tubular form from the spout 3 that adds hot extruder 1, under the state of keeping the temperature more a lot of than glass transformation temperature (Tg) height, change to the thickness of regulation sharp from the thickness of the flow path width of spout, so be in the labile state that is subjected to the influence that produces by the turbulent flow of the air-flow of small tension variation, periphery etc. easily.Because stabilizing device 4 has being in the thermoplastic resin of this labile state, do not hinder this resin flow and make the function of dimensionally stableization, so after gauffer, lax, fluctuation etc. can not take place on the tubular resin film that generates, can obtain the film that thickness is little and even, have smooth surface.

Like this, stabilisation mechanism 4 becomes in the present invention and has most one of structure of feature.In order in depth to understand, several object lessons of stabilizing device 4 are described with reference to the accompanying drawings here.

Fig. 2 is the sketch of an example of the formation of expression the 4a of the portion that separates that stabilizing device is provided with as the spout 3 that adds hot extruder 1 is separated with core component 2.In this structure, the thermoplastic resin after the spout 3 that adds hot extruder 1 is extruded in a tubular form just, with top described the same, also be in than the high a lot of temperature of glass transformation temperature (Tg), but because the 4a of separation portion, for example for the thermoplastic resin after spout 3 is extruded in a tubular form just, prevent because and the external force that causes such as contacting of other object add, the disorder of the atmosphere around the inhomogeneous films such as reaching temperature fluctuation that flows of gas, the original unsettled regional guidance that thickness sharply can be reduced is to stabilization of state, so after gauffer can not take place on the tubular resin film that generates, lax, fluctuation etc., and it is little and even to access thickness, film with smooth surface.The big or small L of the 4a of separation portion shown in Fig. 2 (2 the distance from spout 3 to core component) for example can be set at 3～50mm.The stabilized thermoplastic resin of shape then is sent to core component 2, is configured as tubular resin film 20.

Fig. 3 is that expression is with the sketch of stabilizing device 4 as an example of the structure of the second core component 4b that oozes out gas from the surface.The second core component 4b and core component 2 are same, are connected with the gas supply source (not shown).From the gas that the surface of this second core component 4b is oozed out, its temperature and seepage discharge can be regulated according to the kind of thermoplastic resin, and this can realize by not shown temperature-adjusting device and pressure-regulating device.Here, the state that oozes out from its surface with gas of the second core component 4b and the gas different mode of state of oozing out from the surface of core component 2 forms.Specifically, the gas seepage discharge of the second core component 4b is lacked than the gas seepage discharge of core component 2.Because the thermoplastic resin after just having extruded in a tubular form from spout 3 also is in than the high a lot of temperature of glass transformation temperature (Tg), thus as if too much, then make the rough inner surface of thermoplastic resin probably from the gas seepage discharge of the second core component 4b, unsatisfactory.In this structure, second core component 2, for example, for for the thermoplastic resin after just extruding in a tubular form from spout 3, ooze out carrying out gas lentamente by core component in order to keep contactless state, when shape is not changed, can realize cooling condition of stipulating etc., so, can make the dimensionally stableization of thermoplastic resin, after gauffer, lax, fluctuation etc. can not take place on the tubular resin film that generates, can obtain the film that thickness is little and even, have smooth surface.In addition, this second core component 4b also can also use simultaneously with the 4a of portion that separates described above.

It (b) is expression constitutes two examples of stabilizing device 4 as thermoregulation mechanism sketch that Fig. 4 (a) reaches.In Fig. 4 (a), as constituting thermoregulation mechanism from the temperature regulating heater 4c that manages inboard temperature of regulating the thermoplastic resin of extruding in a tubular form.In Fig. 4 (b), constitute thermoregulation mechanism as the temperature regulating heater 4d of the temperature of regulating the thermoplastic resin of extruding in a tubular form from the pipe outside.Temperature regulating heater 4c and 4d are for example controlled by PID, thermoplastic resin little by little can be cooled near the temperature the Tg.In these structures, thermoregulation mechanism, for example can energetically thermoplastic resin be carried out adjustment with respect to natural cooling, make the dimensionally stableization of thermoplastic resin thus, so, can make after the tubular resin film that generates can not produce gauffer, lax, fluctuation etc., and obtain the film that thickness is little and even, have smooth surface.In addition, this thermoregulation mechanism, also with the structure of Fig. 4 (a) and Fig. 4 (b) merging, promptly, the structure that all has temperature regulating heater in the pipe inboard and the pipe outside of the thermoplastic resin of extruding in a tubular form, perhaps, also can be simultaneously and the structure of usefulness with 4a, the second core component 4b in temperature regulating heater and described above the separation.

Fig. 5 is expression constitutes an example of stabilizing device 4 as the anti-locking mechanism 4e of air-flow a sketch.Air-flow is prevented locking mechanism 4e, for example, can be to prevent prevent the structure that wall such of airflow collision to the thermoplastic resin of extruding in a tubular form from spout 3.In this structure, because air-flow is prevented locking mechanism 4e and is prevented the thermoplastic resin of extruding in a tubular form from spout 3, for example the air-flow in manage that causes of the gas that oozes out from core component 2 to blow blowing of attached and the air-flow outside managing attached, so, can make it tubular resin film that the back generates gauffer, lax, fluctuation etc. can not take place, and obtain the film that thickness is little and even, have smooth surface.In addition, this air-flow is prevented locking mechanism 4e, also can also use simultaneously with 4a, the second core component 4b, thermoregulation mechanism in described above the separation.

In addition, preferably add the spout 3 of hot extruder 1, the 3b of its peristoma portion is made of hard material at least.Here, the so-called peristoma 3b of portion is meant the leading section of spray-hole of the thermoplastic resin of spout 3.Fig. 6 is (c) amplification view of spout 3 (a) stereogram, (b) cutaway view and the 3b of peristoma portion.

In order to improve the fissility that thermoplastic resin is peeled off from spout 3, the 3b of peristoma portion of spout 3 need be processed into sharp keen shape usually.Specifically, in Fig. 6 (c), preferably making corner radius R1 and R2 is 50 ± 5 μ m or below it.When making this shape, owing to the thermoplastic resin of extruding from spout 3 can be attached on the 3b of peristoma portion, so can generate ganoid smooth film.But, owing to the 3b of peristoma portion is made sharp keen shape, the intensity of the general 3b of peristoma portion is just low more, so because maintaining etc., the 3b of peristoma portion can wear and tear at leisure, perhaps under the poorest situation, can cause the 3b of peristoma portion to form the problem of breach.In addition, the material of material softnesses such as general iron, stainless steel material, add man-hour peristoma portion have the angle of collapsing may, it is very difficult to be processed into sharp keen shape sometimes.And in the present invention,, can be processed into sharper keen shape by constitute the 3b of peristoma portion of spout 3 with hard material, and then, enough durability can be provided.Thus, can not make the wearing and tearing of peristoma portion because of the extrusion pressure of thermoplastic resin or form breach, can carry out extruding of long-time continual and steady thermoplastic resin.In addition, the Rockwell A hardness that preferably constitutes the hard material of spout 3 is 85 or more than it.As hard material, can list titanium alloy, ceramic material etc.Plating, nitrogen treatment etc. also can be carried out in the surface of hard material.

In addition, when from spout 3 resin melt extrusions, spout 3 can have nozzle arbitrarily.At this moment, molten resin is extruded from spout 3 via this nozzle.As the example of nozzle, adopt the parallel nozzle 30 of the straight setting of stream shown in Fig. 6 (b) usually, but also can adopt the nozzle 31 of the enlarged-diameter shown in Fig. 7 (a) as required up to its outlet.The nozzle 31 of enlarged-diameter, because thermoplastic resin is extruded to be extended to radial form, so, can be with the enlarged-diameter of the thermoplastic resin extruded.When the spout from the nozzle 31 that has this enlarged-diameter carries out extruding of thermoplastic resin, owing to can give the power that makes enlarged-diameter to the resin of extruding, so, can along after the circumferencial direction of the tubular resin film 20 that generates give orientation, can obtain the bigger resin film of phase difference.In addition, also can adopt shown in Fig. 7 (b), earlier with the reduced of stream 3a, then with the nozzle 32 of the enlarged-diameter of enlarged-diameter.If make such shape, owing to can dwindle the diameter of extruding of thermoplastic resin, so, the structure of whole device can be made compactly more.

But, as molten resin being sent to the mode of spout 3, mainly contain following dual mode from the cylinder 1b that adds hot extruder 1.That is, utilize the cross axle mode of single stream with common mode resin melt extrusion; And, for example utilize 4 of the end be arranged on cylinder 1b to have spiral helicine stream, once branch, the helix mode of then molten resin of branch being confluxed once again.Can utilize any mode in the present invention, but if the latter's helix mode, then since after be not easy to occur the resin flow pattern on the surface of the tubular resin film 20 that generates, so good in aesthetic, so be preferred.In addition, when when to spout 3, filter being set, owing to the impurity that can remove in the molten resin, so can obtain more excellent beautiful appearance from the cylinder 1b that adds hot extruder 1.

And then, tubular resin manufacturing installation 100, also can with from the outer surface that adds the thermoplastic resin that hot extruder 1 extrudes in a tubular form relative to and outer member 5 is set.Fig. 8 is the partial enlarged drawing that has the tubular resin apparatus for manufacturing thin film 100 of outer member 5.Be provided with on the tubular resin apparatus for manufacturing thin film 100 under the situation of outer member 5, because this outer member 5 and core component 2 co-operatings, can form from the outside and the inboard both sides of the thermoplastic resin extruded in a tubular form by spout 3, so can make the tubular resin film 20 that shape is more neat, flatness is more excellent.In addition, outer member 5 also can be on its surperficial part or the structure of gas is oozed out on whole surface.In this case, can regulate the temperature of the gas that oozes out in advance.Like this, owing to the outer surface and the outer member 5 of thermoplastic resin can be remained on contactless state, so, after gauffer, lax, fluctuation etc. can not take place on the tubular resin film that generates, can obtain the film that thickness is little and even, have smooth surface.

In addition, above-mentioned core component 2, the second core component 4b and outer member 5 can constitute with porous material respectively.When constituting above-mentioned each member with porous material, ooze out state owing to can reach same gas on all surfaces of each member, so almost there are not the partial deviations of gas seepage discharge.Thereby, improve the untouchable of thermoplastic resin and core component more, so, not can after cause damage or strip shape etc. on the tubular resin film that generates, can obtain more smooth, the smooth high-quality film in surface.As the example of porous material, can list metallicity porous material (porous sintering metal etc.), inorganic porous material (porous ceramic etc.), filter material, the metal in a plurality of holes etc. is set.When considering that durability, maintenance, gas ooze out the uniformity of state, preferable alloy porous material, most preferably porous sintering metal.Preferred porous material is adjusted its aperture, thickness etc., oozes out state so that can reach same gas.

Secondly, below Fig. 1, be relevant to before this till the tubular resin apparatus for manufacturing thin film of the present invention and the manufacture method of explanation, describe mechanism and method that stretching tubulose resin film is used in detail.In addition, the drawing mechanism of the film of the following explanation of relevant this specification and the record of drawing process, certainly use the tubular resin film that utilizes tubular resin apparatus for manufacturing thin film of the present invention to make, but, the situation of the different therewith tubular resin films of making in advance (it is not limited to the goods with tubular resin apparatus for manufacturing thin film manufacturing of the present invention) that also can be applied to stretch.

Tubular resin apparatus for manufacturing thin film 100 of the present invention comprises; Stretching is by the extension section 6 of the tubular resin film 20 of core component 2 shapings; The maintaining part 7 of the shape of the tubular resin film 20 that maintenance is stretched.In addition, at the leading portion of extension section, the preheating part 11 that tubular resin film 20 is carried out preheating can be set also.Preheating part 11, for example with and the same porous materials formation of core component 2, be connected with not shown gas supply source, can the inner surface to tubular resin film 20 oozes out from the surface of preheating part 11 with carrying out suitable thermoregulator air-flow.By regulating the temperature and the flow of the gas that oozes out from preheating part 11, tubular resin film 20 is preheated, and can change preheat temperature.Be necessary to make it to manifest phase difference etc., making under the situation of tubular resin film 20 orientations, the draft temperature of preferred tubular resin film 20 from Tg to Tg+50 (℃) scope in.More preferably temperature range from Tg+10 (℃) to Tg+30 (℃) scope in.If in this scope, can carry out orientation on the tubular resin film 20 with higher efficient, can make it to manifest phase difference wittingly.Under the draft temperature situation lower than Tg, must give film very strong stress in order to stretch, film has the danger of fracture.In addition, under the draft temperature situation higher than higher limit, because in most of the cases resin approaches molten condition, so, even stretch, can not make molecularly oriented, can not expect to show phase difference.

Extension section 6 and maintaining part 7 constitute the structure that has feature among the present invention most.Here, in order further to sharpen understanding, below extension section 6 and maintaining part 7 are described particularly.

Extension section 6, as shown in Figure 1, by the draw roll 8 of (MD stretchings) the tubular resin film 20 that mainly stretches in the longitudinal direction and/or mainly stretch in a circumferential direction expanded in diameter mandrel 9 formations of (TD stretching) tubular resin film 20.

Utilizing 6 of extension sections to carry out under the situation of MD stretching, as long as use tubular resin apparatus for manufacturing thin film 200 shown in Figure 9.Tubular resin apparatus for manufacturing thin film 200 in the tubular resin apparatus for manufacturing thin film 100 of Fig. 1, replaces conical mandrel 9, adopts the cylindrical shape mandrel 10 with cross sectional shape identical with core component 2.By adopting this cylindrical shape mandrel, in the time of can suppressing MD and stretch to the contraction of TD direction.In addition, constitute the draw roll 8 of extension section 6, as long as be arranged at least on the tubular resin film 20 on the position, but, as Fig. 1 or shown in Figure 9, when the length direction along tubular resin film 20 separates proper spacing and is arranged on two positions, utilize the rotary speed difference of two draw rolls 8 and can more accurate and more easily carry out MD and stretch, so be preferred.In addition, draw roll 8 both can be mixed with the exterior side of tubular resin film 20 or a side of inner face side and contact, and perhaps also can be configured on the inner face side and exterior side two sides of tubular resin film 20, utilized two draw roll clamping tubulose resin films 20.

Utilizing this structure to carry out MD when stretching owing to can on the length direction of film, give orientation, so can make be applicable to LCD (LCD) wait in the tubular resin film of phase-contrast film of use.Gauffer, lax, fluctuation etc. can not take place in this tubular resin film, can make thickness little and even, have smooth surface, phase difference little high-quality resin film goods that rise and fall.

Carrying out under the situation that TD stretches, as shown in Figure 1,, tubular resin film 20 carried downwards get final product as long as make the surface of tubular resin film 20 along conical mandrel 9.Be accompanied by the conveying of tubular resin film 20, the TD that carries out tubular resin film 20 with the stretching ratio corresponding to the external diameter of mandrel stretches.

In addition, also conical mandrel 9 can be divided into a plurality of parts, various piece can be moved along radial direction, can change the enlarged diameter of tubular resin film.Figure 10 represents an example of this Splittable expanded in diameter mandrel 50.The Splittable expanded in diameter mandrel of Figure 10 can be divided into 4 mandrel fragments (50a～50d).Each mandrel fragment (50a～50d), can move along radial direction respectively.Moving of they can be with manually carrying out, and also can utilize mechanical means such as motor to carry out.In addition, each mandrel fragment (50a～50d), not only can when the off-line state of the operation of not carrying out the tubular resin film, move, and in stretching process, also can move, so, in operation process, can carry out the fine setting of thin film fabrication condition.Thus, tubular resin film of the present invention can be made more high-quality resin film goods.In addition, under the situation of utilizing above-mentioned this Splittable expanded in diameter mandrel 50, also can make preheating part 11 and keep 7 also to carry out same action corresponding to the cutting apart and move of Splittable expanded in diameter mandrel 50.

When utilizing this structure to carry out TD when stretching owing to can give orientation along the circumferencial direction of film, so, can make be applicable to LCD (LCD) wait in the tubular resin film of phase-contrast film of use.Gauffer, lax, fluctuation etc. can not take place in this tubular resin film, can obtain thickness little and even, have smooth surface, phase difference little high-quality resin film goods that rise and fall.

Carry out at the same time under the biaxial stretch-formed situation that MD stretches and TD stretches, so-called, as shown in Figure 1, as long as use conical mandrel 9 and draw roll 8 simultaneously.The stretching ratio of the tubular resin film 20 of MD draw direction and TD draw direction by the rotary speed of selection draw roll 8 and the external diameter of conical mandrel 9, can be set desirable value for.In addition, carrying out when biaxial stretch-formed, MD stretches, TD stretches also can carry out respectively.For example, can utilize draw roll 8 to carry out MD earlier and stretch, then, the tubular resin film that will carry out the MD stretching is added in and carries out the TD stretching on the conical mandrel 9.Perhaps, also can earlier the tubular resin film be added in and carry out the TD stretching on the conical mandrel 9, then, the tubular resin film that will carry out the TD stretching utilizes draw roll 8 to carry out MD and stretches.

Owing to constitute the draw roll 8 of extension section 6, directly contact with the surface of tubular resin film 20, so, preferably with the material that can not injure surperficial softness (for example silicon rubber etc.) formation.In addition, for the tubulose resin film 20 that can stretch equably, preferred draw roll 8 disposes in the mode that contacts with a plurality of points at the interval of equalization around tubular resin film 20.And then, preferably constitute the conical mandrel 9 and/or the cylindrical shape mandrel 10 of extension section 6, the same with above-mentioned core component 2, the second core component 4b or outer member 5, constitute with porous materials such as porous sintering metals.At this moment, if each mandrel is connected with the gas supply source (not shown), ooze out the words of the formation of the gas of suitably having regulated temperature and flow as required from their surface, then owing to avoided tubular resin film 20 to contact with the direct of mandrel, so, scar or strip shape etc. can be on the inner surface of tubular resin film, do not caused, more smooth, the smooth high-quality resin film in surface can be obtained.In addition, owing to, reduced the resistance when stretching, can utilize extension section to carry out the effect of stretching process smoothly so also have by improving the untouchable of tubular resin film and extension section.

Maintaining part 7, the shape of the tubular resin film 20 that stretches in order to keep is provided with.When the tubular resin film that finishes from stretching had just been removed giving of tensile force, because its reaction, the tubular resin film can shrink.If there is not a maintaining part, then stretch orientation film, under free state, shrink, can take place that thickness rises and falls or phase difference rises and falls.In the present invention, in order to prevent this phenomenon, with the tubular resin film 20 after the maintaining part 7 maintenance stretchings, simultaneously with its fixed in shape, the film after preventing to stretch produces contraction etc.Thereby, in the present invention, gauffer, lax, fluctuation etc. can not take place on by the tubular resin film after the maintaining part 7, can obtain thickness little and even, have smooth surface, phase difference little high-quality resin film goods that rise and fall.

If finish by maintaining part up to film, film is not cooled to temperature to a certain degree yet, then in the moment by maintaining part, stretch orientation film under the free state of the condition of high temperature, shrink, it is very high that the possibility that thickness rises and falls or phase difference rises and falls takes place.In the present invention, in order to prevent this phenomenon, preferred maintaining part 7 constitutes in the mode with the cooling of tubular resin film.In addition, preferably can adjust the chilling temperature of maintaining part and the length of maintaining part, make before film finishes by maintaining part, the temperature of film becomes Tg or its following temperature.

In addition, maintaining part 7 for example also can be such formation: and above-mentioned extension section 6 is made of porous material equally, be connected with not shown gas supply source, the gas of suitably having regulated temperature and flow as required is exuded on the inner surface of the tubular resin film 20 that has stretched from the surface of maintaining part 7.

In Fig. 1 and Fig. 9, the inboard that preheating part 11 is shown, constitute the conical mandrel 9 of extension section 6 or cylindrical shape mandrel 10, maintaining part 7 is configured in cylindrical resin film 20, but also can be configured in the inboard and the outside of cylindrical resin film 20, from sandwich cylindrical resin film 20.In this case, owing to cylindrical resin film 2 can not expose fully, so, can more stretch under the stable status.

Because the such tubular resin film 20 that obtains, not only thickness is little but also surperficial extremely smooth, and can give excellent orientation, so, can be suitable as well LCD (LCD) wait in the phase-contrast film of use.The thickness of the film that uses as this phase-contrast film can be value arbitrarily, but is turning under the situation of purpose with the device that reduces cost and phase-contrast film is used as member slim, and its thickness is preferably thin as much as possible.If utilize tubular resin apparatus for manufacturing thin film of the present invention, even then for example thickness below 0.1mm, gauffer, lax, fluctuation etc. can not take place yet, can obtain thickness little and even, have smooth surface, phase difference little high-quality resin film goods that rise and fall.

And owing to the gas that oozes out from the surface of core component 2, the second core component 4b, preheating part 11, extension section 6, maintaining part 7 etc. flow in the zone of the stabilizing device 4 from the spout to the core component, cause the interior undesigned pressure in zone of stabilizing device 4 to rise sometimes, the pipe internal pressures in the tubular resin film 20 are risen.In this case, thermoplastic resin expands to foreign side, perhaps shrinks repeatedly to enlarge.This phenomenon might cause ill effect to the flatness of the film surface of final acquisition and the uniformity of thickness, is unfavorable.Therefore, for this situation being taken precautions against in possible trouble the preferred air-breather that prevents the pipe internal pressure rising usefulness in the tubular resin film that is equipped with.Like this, do not have the tubular resin film to expand or shrink the anxiety of expansion repeatedly, can keep the flatness of good film to foreign side.Thereby gauffer, lax, fluctuation etc. can not take place in the tubular resin film, can obtain the high-quality resin film goods that thickness is little and even, have smooth surface.For example, as shown in figure 11, can be via the air-breather 14 that is provided with up to adding hot extruder 1 from spout 3, form the state that is communicated with outside atmosphere, perhaps, also can be provided with the air-breather 16 that connects core component 2, the second core component 4b and from maintaining part 7 up to extension section 6 (perhaps preheating part 11) and with the air-breather 15 that their connect, form the state that the inside with tubular resin film 20 is communicated with outside atmosphere.These air-breathers can use separately, also can simultaneously and use.In addition, press to adjust the interior pressure guiding mechanism of valve etc. in also can having.But, under the situation that air-breather 14 is set, because gas flows out by air-breather 14, so might be at the turbulent flow that in the zone of the stabilizing device 4 of core component, produces air-flow from spout, for the flatness on the surface of the film of final acquisition and the uniformity generation ill effect of thickness.Thereby, should be noted that the turbulent flow of air-flow is exerted an influence to film.Under the situation that air-breather 14 is set, preference is as by extending downwardly into pipe arrangement from air-breather 14 near near the position (for example the top of core component 2, the second core component 4b or the preheating part 11,9 the top of stretching) of regulation, press in perhaps near air-breather 14, being provided with and adjust valve etc., adjust to the pressure of regulation with managing internal pressure, the feasible turbulent flow that air-flow can not take place in the zone of the stabilizing device 4 of core component 2 from spout.

The tubular resin film 20 of being completely fixed of shape is transported to the position of cutter sweep 12, here cuts along its length, become the sheet film (with reference to Fig. 1) of smooth length.Cutter sweep 12, for example with the throughput direction of its cutting part 12a and tubular resin film 20 relative to mode dispose, along with tubular resin film 20 is carried downwards, cutter sweep 12 can cut tubular resin film 20.Figure 12 is 100 a upward view of the tubular resin apparatus for manufacturing thin film of 20 devices to be cut, 12 cuttings of expression tubular resin film and the situation launched.As can be seen from Figure 12, as long as cutter sweep 12 is fixed on the position arbitrarily that intersects with tubular resin film 20.

On the other hand, also can be with cutter sweep 12 to constitute along the rotatable mode of the circumference of tubular resin film 20.In this case, when rotation corresponding to cutter sweep 12, change cutting part 12a towards the time, with tubular resin film 20 conveying coordination downwards, for example tubular resin film 20 can be cut into helical form.In addition, if suitably regulate the transporting velocity of tubulose resin film 20 and the rotary speed of cutter sweep 12, can carry out the helical cut of desirable spacing.As cutter sweep 12, under the situation of using laser cutting machine, by utilizing the direction of the prism that change laser such as remote-controlled operation pass through, can freely change the transmit direction of laser, so, even directly do not make the laser cutting machine motion, also can carry out the helical cut of tubular resin film 20 at an easy rate.And then, since the throughput direction that place and tubular resin film 20 are set of laser cutting machine it doesn't matter and can select arbitrarily, so, improve greatly in the free degree of installing design aspect.And, if adopt this laser cutting machine, not only can carry out helical cut, and can carry out more complicated cutting, so the purposes of resin film increases greatly.In the superincumbent explanation, described making the method for cutter sweep 12 along the circumference rotation of tubular resin film 20, still that cutter sweep 12 is fixing, near making spout, rotate, can obtain to cut into spiral helicine film too.When adopting this structure, need not to make the coiler device rotation of describing later, can save the space.

In addition, in this manual, so far at being illustrated with respect to 20 forms that a cutter sweep 12 is set of tubular resin film, but the present invention is not limited to this form, as shown in figure 13, two cutter sweeps 12 for example also can be set, once obtain a plurality of sheet films.(a) of Figure 13 is the sketch of a part that expression is provided with the tubular resin apparatus for manufacturing thin film of two cutter sweeps 12, (b) is the upward view of the tubular resin apparatus for manufacturing thin film of (a).In addition, in when cutting, also can insert the insertion member 60 that has with the roughly the same external diameter of the internal diameter of tubular resin film 20 in advance in the inboard of tubular resin film 20.This insertion member, because the action when tubular resin film 20 is carried is stable, so, can reduce rocking of cutter sweep 12, the cutting of carrying out tubular resin film 20 that can be more accurate and stable.In addition, if make this insertion member 60 be porous material, be connected with not shown gas supply source, ooze out gas from the surface of inserting member 60, then owing to can make the inner surface that inserts member and tubular resin film 20 be in contactless state, so can reduce the possibility of damage, be more preferably.

In addition, in the present invention, tubular resin film 20 is cut off along its length, make sheet film, still, self-evident, utilize the method carry out in the past, promptly utilize, also can obtain two sheet films the tubular resin film 20 folding methods that its two ends are cut off.

The sheet film of the length of utilizing cutter sweep 12 to cut and generating finally utilizes coiler device 13 reel (with reference to Fig. 1 or Figure 13).Coiler device 13, non-warping for film when reeling, be necessary and above-mentioned cutter sweep 12 interlocks.That is, under the situation that cutter sweep 12 is fixed, coiler device 13 is also fixing, under the situation that cutter sweep 12 rotatablely moves, corresponding to this, is necessary also to make coiler device 13 to rotatablely move.If coiler device 13 and cutter sweep 12 are constituted integratedly, then former state is reeled when tubular resin film 20 is cut off, so, can tackle any situation recited above.As the example of coiler device 13, can list elongated paper tube etc.

The sheet film that obtains from the tubular resin film of making in a manner described of the present invention, owing to can give excellent orientation, so, can be suitable for as phase-contrast film.Here, phase-contrast film in the liquid crystal display cells that utilizes TN, VA, STN orientation etc., is used to improve the reduction at the visual angle that the birefringence because of liquid crystal causes.Usually, phase-contrast film is when the deviation of slow axis angle is spent above ± 3, become the reason of the irregular colour of liquid crystal indicator, and the sheet film that obtains according to the present invention, the deviation of slow axis angle on the thin-film width direction in ± 3 degree, display quality is outstanding.

In addition, in the phase-contrast film of making in the stretching that utilizes existing stenter mode, because the deviation of the slow axis angle of its end is big, so, can only utilize the central portion of film, but, in the present invention, owing to stretch resin film being maintained under the constant state of tubulose, so, can utilize whole width of film, therefore improve yield rate, can reduce manufacturing cost significantly.

If for example spendable thermoplastic resin among the present invention is shown, then can list: polyethylene, polypropylene, polystyrene, Merlon, polyester, polyarylate, polyamide, cyclic polyolefin, ethylene-vinyl alcohol copolymer, polyether sulfone etc.These resins can use separately, perhaps also can be used as to contain two kinds or its above polymer blend or copolymer and use.Perhaps, derivative or the sex change thing that also can be used as these resins uses.

Particularly under the situation that the thermoplastic resin membrane that will be obtained by tubular resin film of the present invention uses as the phase-contrast film of supplying with LCD uses such as (LCD), as these resin materials, preferably, selection can be heated and/or the influence of moisture, can guarantee the material of high dimensional stability (for example thickness evenness) and optical stability (for example postponing uniformity), select to have high glass transformation temperature (Tg) in order to bear the heat backlight that the comes from liquid crystal indicator material of (for example 120 ℃ or more than it), and then, in order to obtain good liquid crystal display, select the material of visible light permeability excellence.The thermoplastic resin membrane can be unstretched, also can be single shaft or biaxial stretch-formed.Perhaps, on the thermoplastic resin membrane, apply discoid liquid crystal polymer, nematic liquid crystal polymer etc. and make it orientation.

In addition, require long-time stability for phase-contrast film, the absolute value of the photoelastic coefficient of preferred film is 1.0 * 10 for this reason ^-11Pa ^-1Or below it.As the thermoplastic resin that satisfies this specific character, the preferred especially norbornene polymer that uses as cyclic polyolefin.Here, so-called norbornene polymer, have: the homopolymers that constitutes by the norborneol vinyl monomer or the copolymer of its hydride, norborneol vinyl monomer and ethylene compounds or its hydride etc., as concrete goods, can list: " Ah Tong (ア-ト Application) " (JSR corporate system), " carrying Ao Nuoa (ゼ オ ノ ア) ", " carrying Ao Neikusi (ゼ オ ネ Star Network ス) " (Japanese ゼ オ Application corporate system), " Abbe Shandong (ア ペ Le) " (Mitsui Chemicals corporate system) " Topas " (Ticona corporate system) etc.

In thermoplastic resin, also can in the scope that does not influence its physical property (glass transformation temperature, transmitance etc.), add antioxidant, lubricant, colouring agent, dyestuff, pigment, inorganic filler, couplant etc. on a small quantity.

As antioxidant, can list phenols antioxidant, phosphoric acid class antioxidant, sulphur class antioxidant, lactone antioxidant, hindered amine light stabilizer (HALS) etc.For example,, consider heat endurance and intermiscibility, preferably use the phenols antioxidant for resins such as cyclic polyolefins.Object lesson as the phenols antioxidant, can list: [3-(3 for pentaerythrite four, the 5-di-tert-butyl-hydroxy phenyl) propionic ester] (for example: trade name " Yi Lujia nox (イ Le ガ ノ Star Network ス) 1010 " (チ バ ス ペ シ ヤ Le テ イ ケ ミ カ Le ズ corporate system)), 3-(3, the 5-di-tert-butyl-hydroxy phenyl) the propionic acid octadecyl ester (for example: trade name " Yi Lujia nox (イ Le ガ ノ Star Network ス) 1076 " (チ バ ス ペ シ ヤ Le テ イ ケ ミ カ Le ズ corporate system)), 3,3 '; 3 " 5,5 '; 5 "-six tert-butyl groups-a, a '; a "-(trimethylphenyl-2,4,6,-three bases) three p-cresols (for example: trade name " Yi Lujia nox (イ Le ガ ノ Star Network ス) 1330 " (チ バ ス ペ シ ヤ Le テ イ ケ ミ カ Le ズ corporate system)), 1,3,5-three-(3, the 5-di-tert-butyl-4-hydroxyl benzyl)-1,3,5-triazines-2,4,6 (5H) triketone (for example for 1H, 3H, trade name " Yi Lujia nox (イ Le ガ ノ Star Network ス) 3114 " (チ バ ス ペ シ ヤ Le テ イ ケ ミ カ Le ズ corporate system)), 3,9-two-2-[3-(3-tertiary butyl-4-hydroxy-5 aminomethyl phenyl) propionyloxy] and-1, the 1-dimethyl ethyl }-2,4,8,10-four oxygen spiral shell [5,5] hendecanes (for example: trade name " Ah being with Ka Sitabu (ア デ カ ス Block) AO-80 " (Asahi Electro-Chemical Co. Ltd's system)) etc.Antioxidant preferably is modulated in the scope of 0.01～5 weight % with respect to the content of thermoplastic resin.When content during more than 5 weight %, the transmitance of film and bad mechanical strength when being lower than 0.01 weight %, can not obtain enough oxidation-protective effects, so be unfavorable.

In addition, as the example of lubricant, can list: fatty acid amide series lubricant agent, non-ionic surfactant series lubricant agent, carbon compound series lubricant agent, fatty acid lubricant, ester series lubricant agent, pure series lubricant agent, fatty acid metal salts series lubricant agent (metallic soap), the partly-hydrolysed thing of montanate, silicon series lubricant agent etc.For example, for resins such as cyclic polyolefins, consider heat endurance and intermiscibility, the fatty acid amide series lubricant agent is preferred.Concrete example as the fatty acid amide series lubricant agent can list: stearic amide (for example: trade name " Da Yiyami struggle against (ダ イ ヤ ミ Star De) 200 " (Japan changes into corporate system)), methylene distearyl acid acid amides (for example: trade name " Bi Siamayite (PVC ス ア マ イ De) LA " (Japan changes into corporate system)), m-xyxylene stearic amide (for example: trade name " Parkes in this (ス リ パ Star Network ス) PXS " (Japan changes into corporate system)), the ethylenebis stearic amide (for example: trade name " flower king Wa Kesi (ワ Star Network ス) EB " (KAO. Corp. SA's system), A Mowakesi (ア-モ ワ Star Network ス) EBS (ラ イ オ Application ア Network ゾ corporate system)).Lubricant is preferably 0.01～10 weight % with respect to the content of thermoplastic resin, most preferably is 0.05～1 weight %.When containing quantity not sufficient 0.01 weight %, manifest hardly and extrude the effect that torque reduces, prevents film generation scratch slide mark.When content surpassed 10 weight %, the situation that takes place to slide with extruder screw increased, and can not supply resin equably, is difficult to stably make film.And then As time goes on, seepage discharge increases, and becomes that appearance of films is bad, the reason of imperfect bonding etc.

Above-mentioned phenols antioxidant, lubricant etc. can use separately, also can or also use simultaneously more than it two kinds.

As the adding method of additives such as antioxidant, lubricant in thermoplastic resin, for example, have: the particle of thermoplastic resin and the additive powder of ormal weight are mixed, with the method that adds the hot extruder heating and melting; With organic solvent with the dissolving of thermoplastic resin and additive after, the method that solvent is distilled away; Modulate the method for the masterbatch of thermoplastic resin and additive in advance; And the method etc. of in above-mentioned masterbatch, mixing the resin that uses when making above-mentioned masterbatch resin of the same race or not of the same race.In addition, for above-mentioned antioxidant, lubricant etc., utilize this additive to be coated near the method for the stream (particularly the spout) of the inside that adds hot extruder, supply the method for this additive etc. by hopper or stream midway in certain proportion, also can obtain same effect.

Above, be illustrated for preferable form of implementation of the present invention, still,, specific embodiment further is shown describes in order to deepen the understanding of the present invention.In addition, as described below in the embodiment that will illustrate, measure each embodiment various characteristics common, tubular resin apparatus for manufacturing thin film and tubular resin film.

(1) temperature of tubular resin apparatus for manufacturing thin film

Use the K thermocouple (AM-7002) of the upright gauge corporate system of peace.The regulation position that the K thermocouple is attached to the tubular resin apparatus for manufacturing thin film is measured.

(2) gas seepage discharge

Use the FLOLINE SEF-52 of STEC INC system to measure.

(3) film temperature

Use the THERMLET T3P of レ イ テ Star Network ジ ヤ パ Application corporate system, measure the film temperature of the film of continuous-flow.

(4) film thickness

Use the Off イ Le system イ Application ス ペ Network (TS-0600AS2) of テ イ-イ-エ ス corporate system.At first,,, carry out the mensuration of film thickness, then, this is determined on the MD direction repeats 200 times with the interval of 1mm whole width for film in the TD direction.Calculate mean value by total data, represent thickness offset with respect to this mean value with %.

(5) phase difference of film and slow axis (Rather-late phase axle)

The KOBRA-21ADH that uses prince's instrumentation machines corporation to make.At first, on the TD direction,, carry out the mensuration of the phase difference and the slow axis of film, then, this is determined on the MD direction repeats 50 times with the interval of 20mm whole width for film.Calculate mean value from total data, represent phasic difference inhomogeneities with respect to this mean value with %.For the inhomogeneities of slow axis, obtain the scope of the deviation of total data, with " ° " (degree) expression.

Embodiment 1

For example, use and the same device of device of Fig. 1, make the tubular resin film that has stretched according to the present invention.In the present embodiment, as film raw material, use and carry (Tg=136 ℃ of Ao Nuoa (ゼ オ ノ ア) 1420R; Japan ゼ オ Application corporate system).The manufacturing conditions of representing film below.

[adding hot extruder]

Use has the screw type hot extruder that adds of mesh-type filter (mesh size 10 μ m).

Diameter of cylinder: 50mm

Screw rod shape: full thread single-shaft variant

·L/D：25

[spout]

Use has the spout of parallel nozzle.

Bore: 300mm

Corner radius: 10 μ m

Material: hard material (Lip river formula A hardness=91)

Temperature: 230 ℃

[stabilizing device]

Metal rounding post is arranged on the pipe inboard of resin as stabilizing device.

Separating distance: 20mm

[core component]

Use has the metallicity porous material of the average pore size of 35 μ m.

The length of core component: 50mm

The external diameter of core component: 296mm

Gas seepage discharge: 7L/ minute

[preheating part]

To be arranged on the inboard and the outside of tubular resin film by the preheating part that porous material constitutes.

Preheat temperature: 155 ℃ (inboard and outside)

The final film temperature of preheating part: 155 ℃

Gas seepage discharge: adjust to the degree of not damaging film

The length of preheating part: adjust to the length that to keep above-mentioned final temperature

[extension section]

Using diameter ratio up and down is the multipoint mode draw roll that the expanded in diameter mandrel that constitutes of 1: 1.4 porous material and velocity ratio up and down are 1: 1.2.In addition, when stretching, one side from the film inboard and the outside carry out adjustment, one side carries out simultaneously that MD stretches and the TD stretching.

Extension section temperature: 155 ℃ (inboard and outside)

Gas seepage discharge: adjust to the degree of not damaging film

The length of extension section: adjust to and film temperature can be maintained 155 ℃ length

[maintaining part]

The maintaining part that is made of porous material that has with the following diameter same diameter of above-mentioned expanded in diameter mandrel is set in the inboard of tubular resin film.

Maintaining part temperature: 100 ℃ (outside is a normal temperature)

Gas seepage discharge: adjust to the length of not damaging film

The length of maintaining part: adjust to Tg or its following length that film temperature drops to material resin.

[air-breather]

Be provided with as shown in figure 11, connect preheating part, the expanded in diameter mandrel that constitutes extension section and the gas device 15 of maintaining part.

With the tubular resin film that obtains as mentioned above, as shown in figure 13, cut with two cutting machines, reel as two sheet films about width 650mm.This sheet film has good surface appearance, and thickness offset, phase difference inhomogeneities are all ± 2% or below it, and the slow axis inhomogeneities is also at ± 2 ° or below it.

Embodiment 2

In the present embodiment, the film raw material different with the foregoing description 1 and the example of stabilizing device are used in expression.

For example, use and same device shown in Figure 11, make the tubular resin film that has stretched according to the present invention.In the present embodiment, as film raw material, use (Tg=130 ℃ of Topas6013; The Ticona corporate system) is combined with the material of A Mowakesi (ア-モ ワ Star Network ス) EBS (ス ラ イ オ Application ア Network ゾ corporate system) of 0.2 weight % in as lubricant.

The film manufacturing conditions of present embodiment is except that following each point, identical with the condition of the foregoing description 1.

[stabilizing device]

Be provided with second core component that porous material constitutes in the pipe inboard of resin.

[preheating part]

The final temperature that makes preheating part temperature and preheating part is 150 ℃

[extension section]

One side is carried out adjustment from the inboard and the outside of film, and one side is carried out the MD stretching respectively and TD stretches.

The extension section temperature, in the inboard and the outside be 150 ℃, the length adjustment of extension section is to film temperature being maintained 150 ℃ length.

[maintaining part]

The member that is made of porous material of the diameter of the following diameter-2 (mm) with above-mentioned expanded in diameter mandrel is set in the inboard of tubular resin film.

[air-breather]

Air-breather 14 as shown in figure 11, that is provided with up to adding hot extruder 1 from spout 3 is set and connect preheating part, constitute extension section the expanded in diameter mandrel, reach the air-breather 15 of maintaining part.

With the tubular resin film that obtains as mentioned above, as shown in figure 12, cut with a cutting machine, reel as a sheet film about width 1300mm.This sheet film has good surface appearance, and thickness offset, phase difference inhomogeneities are all ± 2% or below it, and the slow axis inhomogeneities is also at ± 2 ° or below it.

Embodiment 3

In the present embodiment, the film raw material that use and the foregoing description 1 are different and the example of stabilizing device have been represented.

Here, for example use and the same device of device of Fig. 4, make the tubular resin film that has stretched according to the present invention.In the present embodiment, as film raw material, use in the Abbe Shandong (Tg=125 ℃ of (ア ペ Le) 6013T; The Mitsui Chemicals corporate system) material that cooperates " Yi Lujia nox (イ Le ガ ノ ッ Network ス) 1010 " (チ バ ス ペ シ ヤ Le テ イ ケ ミ カ Le ズ corporate system) of 0.5 weight % in as antioxidant.

The film manufacturing conditions of present embodiment, except that following each point, also the condition with the foregoing description 1 is identical.

[stabilizing device]

In the pipe inboard of resin and the arranged outside temperature regulating heater as stabilizing device.This temperature regulating heater, with adjustment to not producing degree in uneven thickness at the thermoplastic resin of extruding in a tubular form.

[preheating part]

Preheating part temperature: 145 ℃ (inboard and outside)

The final film temperature of preheating part: 145 ℃

[extension section]

In addition, when stretching, one side is carried out adjustment from the inboard and the outside of film, and one side is carried out the MD stretching respectively and TD stretches.

Draft temperature: 145 ℃ (inboard and outside)

Extension section length: adjust to and film temperature can be maintained 145 ℃ length

[air-breather]

Air-breather 14 as shown in figure 11, that be provided with up to adding hot extruder 1 from spout 3 is set.Pipe arrangement is extended to preheating part top from air-breather 14 always, and the gas that oozes out from preheating part, extension section, maintaining part etc. does not have influence on the zone of stabilizing device 4, and directly discharges via air-breather 14.

With the tubular resin film that obtains as mentioned above, as shown in figure 13, cut with two cutting machines, reel as two sheet films about width 650mm.This sheet film has good surface appearance, and thickness offset, phase difference inhomogeneities are all ± 2% or below it, and the slow axis inhomogeneities is also at ± 2 ° or below it.

Embodiment 4

In the present embodiment, expression for example utilizes the example of Splittable expanded in diameter mandrel making film as shown in Figure 10.

In the present embodiment and embodiment 1 same, as raw material, use to carry (Tg=136 ℃ of Ao Nuoa (ゼ オ ノ ア) 1420R; Japan ゼ オ Application corporate system).The film manufacturing conditions of present embodiment, except that following each point, also the condition with the foregoing description 1 is identical.

[extension section]

Use as shown in figure 10, the diameter ratio is the multipoint mode draw roll that the Splittable expanded in diameter mandrel that constitutes of 1: 1.4 porous material and velocity ratio up and down are 1: 1.2 up and down.Splittable expanded in diameter mandrel is that 1.5 times mode is cut apart expansion with the stretching ratio of radial direction.In addition, when stretching. one side from the film inboard and the outside carry out adjustment, one side is carried out MD simultaneously and is stretched and the TD draw piece.

[maintaining part]

The maintaining part of the porous material formation with diameter identical with the following diameter of above-mentioned expanded in diameter mandrel is set in the inboard of tubular resin film.In addition, also be provided with the maintaining part that constitutes with different types of porous material in the outside.

With the tubular resin film that obtains as mentioned above, as shown in figure 13, cut with two cutting machines, reel as two sheet films about width 650mm.This sheet film has good surface appearance, and thickness offset, phase difference inhomogeneities are all ± 2% or below it, and the slow axis inhomogeneities is also at ± 2 ° or below it.

Embodiment 5

In the present embodiment, apparatus for manufacturing thin film shown in Figure 9 is for example used in expression, the example that film is stretched along its length.

Utilize extruder (diameter of cylinder 50mm, screw rod shape: full thread single-shaft variant, L/D=25) will (carry Ao Nuoa (ゼ オ ノ ア) 1600: Japanese ゼ オ Application corporate system) melt extrude as Tg=163 ℃ cyclic polyolefin of thermoplastic resin down for 240 ℃ at resin temperature, import to have nozzle diameter 300mm, in the mould of the ring-type spout of spout gap 1.0mm, adjust the rotating speed and the mould spout gap of extruder, make that the resin spray volume of width of jet direction is certain.

Utilization from the inboard of cylinder film and the flow that flows out for the air-cooling apparatus (core component and outer member) of 1mm in the locational gap of distance mould spout 20mm of arranged outside be 50L/ minute 25 ℃ air, to be cooled to after 180 ℃ from the molten resin of mould ejection, be directed to and have mobile rollers in film inside, and have 4 point supporting types, first draw-gear that can carry out the roller that speed adjusts across film and in the outside, draw with 5m/ minute speed.

Then, after in the heating furnace (preheating part) of the adjustment to 175 of surrounding atmosphere ℃, the cylinder film being heated once more, utilize and second draw-gear that first draw-gear has an identical function is that 1.3 times mode is drawn with speed difference, alongst stretch 1.3 times.Here, inner extension section and maintaining part by the use porous material constitutes.

Then, utilize the cutter sweep that be arranged in parallel with flow direction be arranged on the film outside to cut, then, be launched into plane along the conveying guide member of making in order not produce gauffer.

Be that obtaining thickness is two plane films of 0.1mm on the paper tube of 600mm of up-coiler with the plane winding film that obtains to width.

Every 10mm obtains the good result of the thickness and precision of its width for ± 2 μ m with the thickness of the film of micrometer mensuration acquisition on width.In addition, measure phase difference, phase difference demonstrates the phase-contrast film of the value of 100nm in the acquisition plane.And then, utilize thin film inspection device (Off イ Le system イ Application ス ペ Network ) etc. to carry out careful mensuration, thickness offset, phase difference inhomogeneities are all ± 2% or below it.The slow axis inhomogeneities is at ± 2 ° or below it.At this moment, the slow axis of the phase difference of film has parallel angle with respect to the length direction of film.

Embodiment 6

Here, express and for example use device shown in Figure 10, the example of film along the circumferencial direction stretching.

In the present embodiment, the manufacturing conditions with the foregoing description 5 compares the drawing process difference.

Specifically, by with the cylinder film of the same draw-gear of 4 point supporting types, first draw-gear of the foregoing description 5 traction.In with the heating furnace (preheating part) of surrounding atmosphere adjustment to 175 ℃ once more after the heating, as shown in figure 10, be directed to the inside that is arranged on film, along the circumferential direction be divided into 4, have on its outer wall on the inner spindle of air outflow port, by blowing attached 175 ℃ hot blast internally, and make the mandrel main body mechanically enlarge 1.3 times, stretch along circumferencial direction along radial direction.At this moment, utilize second draw-gear be arranged on the cutting machine back with 5m/ minute speed drawing film.

Then, utilize the cutting machine that be arranged in parallel with flow direction be arranged on the film outside to cut, then along for after do not generate gauffer and the conveying guide member made is launched into plane.To paper tube, obtaining thickness is two plane films of 0.1mm with the plane winding film that obtains.

Every 10mm obtains the good result of the thickness and precision of its width for ± 2 μ m with the thickness of the film of micrometer mensuration acquisition on width.In addition, measure phase difference, obtain the phase-contrast film that the thickness phase difference demonstrates the value of 100nm.And then, utilize thin film inspection device (Off イ Le system イ Application ス ペ Network ) etc. to carry out careful mensuration, thickness offset, phase difference inhomogeneities are all ± 2% or below it.The slow axis inhomogeneities is at ± 2 ° or below it.At this moment, the slow axis of the phase difference of film has the angle of 90 degree with respect to the length direction of film.

Embodiment 7

Here, device shown in Figure 11 is for example used in expression, the example that all stretches along the circumferencial direction of the length direction of film and film.

Specifically, the cylinder film of the draw-gear traction that 4 point supporting types, first draw-gear of quilt and the foregoing description 5 is same, in with the heating furnace (preheating part) of surrounding atmosphere adjustment to 175 ℃ once more after the heating, be directed to be arranged on film inside, in a circumferential direction be divided into 4, have on its outer wall on the inner spindle of air outflow port, by blowing attached 175 ℃ hot blast internally, and the mandrel main body is mechanically enlarged 1.3 times along radial direction, thereby along the circumferential direction stretch.

In addition, utilizing and first draw-gear has second draw-gear of said function, is that 1.3 times mode is drawn the cylinder film with speed difference, also stretches 1.3 times in the longitudinal direction.

Then and embodiment 5 cut equally, reel, obtain two plane films that thickness is 0.1mm.

Every 10mm obtains the good result of the thickness and precision of its width for ± 2 μ m with the thickness of the film of micrometer mensuration acquisition on width.In addition, measure phase difference, phase difference, thickness phase difference all demonstrate the phase-contrast film of the value of 100nm in the acquisition plane.And then, utilize thin film inspection device (Off イ Le system イ Application ス ペ Network ) etc. to carry out careful mensuration, thickness offset, phase difference inhomogeneities are all ± 2% or below it.The slow axis inhomogeneities is at ± 2 ° or below it.

Industrial utilizability

The manufacturing installation of tubular resin film of the present invention and manufacture method can make in multiple use With, for example, can be used as manufacturing installation and the manufacturing of phase-contrast film, shrinkable film, laminated film etc. Method is used.

Claims (9)

1, a kind of tubular resin apparatus for manufacturing thin film, it is characterized in that, comprise: extension section (6), it has mandrel, this mandrel is for the tubulose resin film that stretches, relative with above-mentioned tubulose resin film to whole surface be provided with the hole portion that can ooze out gas internally to above-mentioned tubular resin film surface; The shape of the above-mentioned tubulose resin film that maintaining part (7), its maintenance have been stretched.

2, tubular resin apparatus for manufacturing thin film as claimed in claim 1 is characterized in that, above-mentioned extension section (6) can be given the tensile force of the above-mentioned tubulose resin film that stretches in the longitudinal direction to above-mentioned tubulose resin film.

3, tubular resin apparatus for manufacturing thin film as claimed in claim 1 is characterized in that, above-mentioned extension section (6) can be given the tensile force of the above-mentioned tubulose resin film that stretches in a circumferential direction to above-mentioned tubulose resin film.

4, tubular resin apparatus for manufacturing thin film as claimed in claim 1 is characterized in that, above-mentioned extension section (6) has the mandrel (9,10) that is made of porous material.

5, tubular resin apparatus for manufacturing thin film as claimed in claim 3, it is characterized in that, above-mentioned extension section (6) is a Splittable expanded in diameter mandrel (50), and this Splittable expanded in diameter mandrel (50) may be partitioned into a plurality of parts, and each of above-mentioned a plurality of parts can move in the radial direction.

6, tubular resin apparatus for manufacturing thin film as claimed in claim 1 is characterized in that, above-mentioned maintaining part (7) is made of porous material.

7, tubular resin apparatus for manufacturing thin film as claimed in claim 1 is characterized in that, in above-mentioned maintaining part (7), the tubular resin film is cooled.

8, tubular resin apparatus for manufacturing thin film as claimed in claim 1 is characterized in that, comprises the air-breather (14,15,16) of the pipe internal pressure rising usefulness that prevents above-mentioned tubulose resin film.

9, tubular resin apparatus for manufacturing thin film as claimed in claim 1 is characterized in that, has the preheating part (11) with the above-mentioned tubulose resin film preheating before stretching.

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