CN101870164B - Stretch method of polymer film and manufacturing method of polymer film - Google Patents

Abstract

An off-line stretching device is provided with an accepting chamber and a stretching frame. The accepting chamber accepts an advanced film roller and a subsequent film roller. The width of the advanced film roller is expanded while the stretching machine maintains the maintenance area of the advanced film roller sent out from the advanced film roller. After all advanced films are sent out, subsequent films are sent out to the stretching machine from the subsequent roller. In the jointing part installed in front of the stretching machine, the rear end of the advanced film is overlapped with the front end of the subsequent film so as to form an overlapped part. A deposition area is installed at the part of the overlapped part depart from the central part of the maintenance are in B direction. The jointing part is jointed and processed in the deposition area. After jointing and processing, the jointed film is sent to the stretching machine and stretched towards both sides in B direction at the state of maintaining the maintenance area.

Description

The drawing process of polymer film and the manufacture method of thin polymer film

Technical field

The present invention relates to the drawing process of polymer film (Port リ マ mono-ウ エ Block, polymer web) and the manufacture method of thin polymer film.

Background technology

Thin polymer film (hereinafter referred to as film) has superior photopermeability and can realize flexibility and the feature of light weight filming etc.Therefore, film utilizes as optical thin film is many-sided.Wherein, by cellulose acylate, especially there is TAC film that the cellulosic triacetate (hereinafter referred to as TAC) of 57.5%～62.5% average degree of acetylation forms as optical thin films such as the protective film of the polarization plates of liquid crystal indicator, optical compensating films.As optical compensating film, for example, there is the angle of visual field to expand film.

As the main manufacture method of film, know and have solution film-forming method.In solution film-forming method, the polymer solution that contains polymer and solvent (hereinafter referred to as adulterant) is moulded at the supporter upper reaches of advancing, form stream plastic film.Below this operation is called to stream and moulds operation.The stream plastic film with self-supporting is peeled off from supporter, formed film.Below, this operation is called to stripping process.Also has the dry film of peeling off.Below, this operation is called to drying process.Also have, remove in the situation that the wrinkle that film produces or lax etc., or to film, give in the situation of optical characteristics of expectation, in drying process, use the stretching devices such as fixture stenter, when film is carried with the transporting velocity of regulation, the operation stretching on width (hereinafter referred to as stretch processing).Finally, use up-coiler etc., winding film, at volume core, is formed to film roll.Also have, by carrying out continuously stream, mould operation, stripping process and drying process, efficiency is manufactured film well continuously.

In recent years, due to the development rapidly of liquid crystal display etc., universal, need to the increasing of the optical thin films such as TAC film.Follow the increase of these needs, the raising of the productivity ratio of expectation optical thin film.Due to such background, when improving the gait of march of supporter, by cooling, can be on stream plastic film, show that at short notice the situation that the solution film-forming method of the cooling gel mode of self-supporting adopts as the manufacture method of optical thin film is in the majority.

Yet the optimum speed of the transporting velocity of the gait of march of supporter and film in stretching device is different.Especially, in the situation that having adopted cooling gel mode, concerning the film speed of solution film-forming method, the transporting velocity based on stretching device becomes rate determining step (rate determiningstep).The substance that therefore, can not realize production efficiency improves.Therefore, as JP 2008-238682 communique, proposed independently to arrange and do not carried out stretch processing, manufacture the solution film-forming equipment of film and the film of manufacturing carried out to the stretcher separately of stretch processing (following, be called off-line stretcher), share the method for these equipment.

In addition, preferably as the record in JP 2008-238682 communique, in off-line stretcher, the film of sending from volume core is implemented to stretch processing continuously.Therefore,, when switching film roll, the overlapping lap of the leading section of the rearward end of the film of sending from volume core and new film, as one man carry out the joint (following, to be called joining process) of rearward end and leading section.By utilizing off-line stretcher to carry out such joining process, when the switching of film roll can be carried out, implement continuously the stretch processing of film.

, as the record in JP 2008-238682 communique, in the situation that joining process is as one man implemented in the whole region of lap, in film, form the part of lap and compare with the part that does not form lap in film, be difficult to extend.Thereby, if carry out stretch processing to being implemented the film of joining process, at two-part boundary vicinity, poor due to this deflection, film fracture, fault is multiple.

Summary of the invention

The object of the invention is to address the above problem, the drawing process of polymer film and the manufacture method of thin polymer film of can efficiency carrying out well the stretch processing of film are provided.

The drawing process of polymer film of the present invention comprises engagement step and stretching step.In engagement step, the lap of deposited the first polymer film and the second polymer film and make a series of junction film.In advance, described the second polymer film is follow-up in described the first polymer film for described the first polymer film.Described lap is the rear end of length direction of the first polymer film and the overlapping part of front end of the length direction of the second polymer film.Described lap is divided into a plurality of regions, described in be deposited in the remaining region of removing at least one region in described a plurality of region and carry out.In stretching step, described junction film stretches.In stretching, with keeping a pair of holding member of the state of junction film to carry out, described lap is divided into described a plurality of region in the direction stretching.

Preferably the retaining part with utilizing described a pair of holding member to keep away from part carry out deposited.

Preferably, in a plurality of positions in described region, carry out deposited.

More than 0.5 times and below 0.9 times of length W that preferably length in the direction of the described stretching in deposited described region is described lap.

One side of described a pair of holding member keeps a side's of described junction film end, and the opposing party of described a pair of maintaining body keeps the opposing party's of described junction film end, the width that the direction of described stretching is described junction film.

Preferably from utilize retaining part that described holding member the keeps center side along the direction stretching to described lap away from part carry out described deposited.

The manufacture method of thin polymer film of the present invention, possesses following step, that is: the first polymer film forms step; The second polymer film forms step; The first polymer film step of advancing; The second polymer film step of advancing; Engagement step; And stretching step.

At the first polymer film, form in step, make the first polymer film.At the second polymer film, form in step, make the second polymer film.At the first polymer film, advance in step, the first polymer film is advanced.At the second polymer film, advance in step, continuously in the first polymer film, the second polymer film is advanced.In engagement step, the lap of deposited the first polymer film and the second polymer film, makes a series of junction film.Described lap is the rear end of length direction of described the first polymer film and the overlapping part of front end of the length direction of described the second polymer film.Described lap is divided into a plurality of regions.Be deposited in the remaining region of removing at least one region in described a plurality of region and carry out.In stretching step, stretching junction film, forms described thin polymer film.Stretching is that described lap is divided into described a plurality of region in the direction stretching with keeping a pair of holding member of the state of junction film to carry out.

One side of described a pair of maintaining body keeps a side's of described junction film end, and the opposing party of a pair of maintaining body keeps the opposing party's of junction film end, the width that the direction of stretching is described junction film.

Preferably from utilize retaining part that described holding member the keeps center side along the direction stretching to lap away from part carry out deposited.

Known according to the present invention, lap is divided on draw direction to a plurality of regions.In a plurality of regions, remove in the region at least one region, carry out bonding process.Passed through the lap of such joining process and compared with the lap of as one man having implemented joining process in whole region, as a whole, on width, easily extended.Therefore, though will pass through the film broad ways of joining process as above stretch, also can reduce deflection poor of the part beyond lap and lap, its result, can prevent the fracture of film.Thereby, known according to the present invention, can be in off-line (off line) stretcher, efficiency is carried out stretch processing well.Therefore, can efficiency manufacture well thin polymer film.

Accompanying drawing explanation

Above-mentioned purpose, advantage, by with reference to accompanying drawing, are read the detailed explanation of preferred embodiment, can easily be understood by those of ordinary skills.

Fig. 1 means the side view of the summary of off-line stretcher.

Fig. 2 means the top view of stenter portion.

Fig. 3 is the profile that baffle plate is positioned at the stenter portion while keeping release position.

Fig. 4 is the profile of the stenter portion of baffle plate while being positioned at holding position.

Fig. 5 means the stereogram of the summary at junction surface.

Fig. 6 is the top view that has partly amplified the supporting surface of base.

Fig. 7 means the top view of the summary in the first deposited region arranging at lap.

Fig. 8 means the key diagram in the summary of the first configuration pattern of the melt-coating part of deposited region division.

Fig. 9 means the key diagram in the summary of the second configuration pattern of the melt-coating part of deposited region division.

Figure 10 means the top view of the summary in the second deposited region arranging at lap.

Figure 11 means the top view of the summary in the 3rd deposited region arranging at lap.

Figure 12 means the top view of the summary in the 4th deposited region arranging at lap.

Figure 13 means the top view of the summary in the 5th deposited region arranging at lap.

Figure 14 means the key diagram of the summary of solution film-forming equipment.

Figure 15 means the key diagram of the summary of solution film-forming equipment.

Figure 16 means the stereogram of the configuration status of a plurality of rollers in thermal treatment zone.

The roller lap of splice (ロ mono-Le ラ ツ プ Long) that Figure 17 means a plurality of rollers in thermal treatment zone length (ロ mono-ル Inter Long) key diagram (G) (D) and between roller.

The specific embodiment

As shown in Figure 1, off-line stretcher 2 has film reception room 4, reservoir 5, stenter portion 6, heat mitigation chamber 7, cooling chamber 8 and winding film chamber 9 successively.Film reception room 4 is accommodated the film 3 of strip.In stenter portion 6, film 3 is implemented to stretch processing continuously.

Film reception room 4 possesses film unloading part 10 and the junction surface 11 of turntable (turret) type.Film unloading part 10 has turntable arm (turret arm) 13.At the both ends of this turntable arm 13, be provided with a pair of installation shaft (mounting shaft) 12a.This turntable arm 13 passes through Rotate 180 degree off and on, and a side installation shaft 12a is arranged to film launching position 16, the opposing party's installation shaft 12a is arranged to volume core and changes position 17.At volume core, change in position 17, film roll 14 is installed on to installation shaft 12a, by the rotation of turntable arm 13, the film roll 14 of installing at installation shaft 12a is arranged to film launching position 16.The installation shaft 12a that changes position 17 from being positioned at volume core takes out empty volume core, and new film roll 15 is set.

Film unloading part 10 11 is sent to junction surface from the film roll 14 that is positioned at film launching position 16 by film (hereinafter referred to as film in advance).Film unloading part 10, detecting in the non-existent situation of film roll 14 that is arranged at film launching position 16, by turntable arm 13 Rotate 180 degree, is arranged at film launching position 16 by the new film roll 15 that is positioned at volume core replacing position 17.Also have, from new film roll 15 by film (hereinafter referred to as subsequent thin film), to junction surface, 11 send.

In junction surface 11, the rearward end of deposited film in advance and the leading section of subsequent thin film, carry out the joining process with a film 3.Film 3, via reservoir 5, is sent to stenter portion 6, in stenter portion 6, implements stretch processing.Also have, the details of junction surface 11 and joining process is described later.

In reservoir 5, a part for film is in advance detained.The length of the film being in advance detained at reservoir 5 is more than transporting velocity long-pending of the film in advance in required time of joining process and stenter portion 6.

The edge, both sides that stenter portion 6 keeps film 3 stretches film 3 on width, and film 3 is sent to trimming device 21.Trimming device 21 cuts off this edge, both sides of film 3.As utilizing trimming device 21, the film 3 that cuts off the goods part of its edge, both sides is sent to heat and relaxes chamber 7.On the other hand, cutter drum blower fan (カ Star ト Block ロ ア) 22 is sent in the edge, both sides of cutting off from film 3, chops up as small pieces.The edge small pieces of cutting, by not shown air-supply arrangement, are sent to pulverizer 23, are pulverized, and form sheet.This sheet recycles in adulterant preparation and uses.

In heat, relax chamber 7 and possess a plurality of cylinders 25 and the not shown dry pipe of using, film 3 utilizes cylinder 25, in heat, relaxes the interior conveying in chamber 7, by heating, after heat mitigation, is sent to cooling chamber 8.Also have, from the temperature of the wind of dry airduct preferably 20 ℃ above and below 250 ℃.

After film 3 after heat relaxes is cooled to below 30 ℃ in cooling chamber 8, be sent to winding film chamber 9.In winding film chamber 9, be provided with the up-coiler 27 with mold pressing cylinder 26.Film 3, by mold pressing cylinder 26, when pressing to volume core 28, is wound in core 28.

(stenter portion)

As shown in Figure 2, stenter portion 6 when handle thin films 3, gives the tension force on width (following, to be called direction B) in the longitudinal direction to film 3, from the width W 1 of film 3, expand W2 to.In stenter portion 6, from the upstream side of the throughput direction (hereinafter referred to as direction A) of film 3, be disposed with preheated zone 6a, stretch zones 6b and relief areas 6c.In each region, 6a～6c is provided with not shown pipe.Each pipe is carried the dry wind of regulation to the film 3 that is positioned at each region 6a～6c.Thus, the temperature that is positioned at the film 3 of each region 6a～6c is adjusted to best scope.

Stenter portion 6 possesses fixture 31, track 32,33 and chain 34,35.Track 32,33 is arranged at the both sides on the conveying road of film 3, and track 32,33 separately configures discretely with the orbital spacing of regulation.This orbital spacing is constant in the 6a of preheated zone, in stretch zones 6b, along with direction A, expands gradually, constant in relief areas 6c.Near the downstream of the track 32,33 on direction A, be provided with the drive chain gear teeth 38, near the upstream extremity of the track 32,33 in direction A, the driven chain gear teeth 39 be set.

As shown in Figure 2, chain 34,35, across between the drive chain gear teeth 38 and the driven chain gear teeth 39, moves freely and installs along track 32,33.A plurality of fixtures 31 are installed on chain 34,35 with the interval of regulation.Also have, for fear of numerous and diverseization of figure, a part for fixture 31 is only shown in Fig. 2.

As shown in Figures 3 and 4, fixture 31 comprises fixture (clip) main body 40 and track installation portion 41.Jig main body 40 comprises frame 42 and baffle plate 43.Frame 42 is the word shape of " コ " roughly.Baffle plate 43, by installation shaft 42a, rotates and is installed on freely frame 42.Baffle plate 43 become oblique setting state maintenance release position (with reference to Fig. 3) and become generally perpendicularly displacement between the holding position (with reference to Fig. 4) of the state of erectting and arrange freely, by deadweight or not shown spring, become holding position by ejection.

Track installation portion 41 comprises installing rack 44 and guide roller 45.At installing rack 44, chain 34 or chain 35 are installed.Rotation when guide roller 45 contacts with each supporting surface of each sprocket 38,39 (with reference to Fig. 2) or the supporting surface of track 32 or track 33.Thus, jig main body 40 can not come off from each sprocket 38～39 or each track 32,33, directed along each track 32,33.

As shown in Figure 2, near the upstream extremity of the direction A of track 32,33, arrange and keep starting position Pi.In addition, near the downstream of the direction A of track 32,33, arrange and keep removing position Po.Also have, the open parts 48 of fixture 31 are set at the upstream side that keeps the direction A of starting position Pi, the open parts 49 of fixture 31 are set in the downstream that keeps the direction A of releasing position Po.Open parts 48,49 with by keeping near the upstream side of direction A of starting position Pi and keeping near the head 43a that engages of the baffle plate 43 of the fixture 31 downstream of direction A of releasing position Po to configure contiguously.

By advancing of the fixture 31 along track 32,33, in the situation that engaging head 43a contacts with open parts 48, baffle plate 43 is to keeping release position displacement (with reference to Fig. 3).Thus, fixture 31 becomes the state of the acceptance of the side edge part that can carry out film 3.Then,, if the fixture of advancing 31, by keeping starting position Pi, is removed the contact of open parts 48 and engaging head 43a, baffle plate 43 is to holding position displacement (with reference to Fig. 4).Like this, in keeping starting position Pi, fixture 31 utilizes film to keep face 42b and baffle plate lower surface 43b, keeps edge, both sides (following, the to be called retaining zone) 3w of film 3.Then, utilizing fixture 31 to keep under the state of retaining zone 3w film, to each region, 6a～6c carries successively.In stretch zones 6b, carry out film 3 to stretch along direction B, the width of film 3 is expanded as to the stretch processing of W2 from W1.Extensibility ER (=W2/W1) is preferably more than 1.1 and below 2.0.Then, if fixture 31 is removed position Po by maintenance, engage head 43a and contact with open parts 49.By the contact of open parts 49 and engaging head 43a, baffle plate 43 is to keeping release position displacement.Thus, the maintenance of fixture 31 open retaining zone 3w.

(joint unit)

As shown in Figures 1 and 5, in junction surface 11, from the upstream side of direction A, start configuration and pinch clamp roll cylinder 51 and pinch clamp roll cylinder 52, between clamp roll cylinder 52, configure ultrasonic bonding equipment 53 and base 54 pinching clamp roll cylinder 51 and pinch.

(base)

Base 54 has supporting surface 55.As shown in Figure 6, supporting surface 55 is implemented to annular knurl processing, be formed with countless projections 56.Projection 56 forms square prism-frustum-shaped.Also have, the shape of projection 56 is not limited to square terrace with edge, can be round platform, cima, square cone, circular cone and other shapes.In addition, base 54, under the control of not shown control part, moves freely and arranges on direction C.

(pinching nip rolls)

Return to Fig. 1, pinch clamp roll cylinder 51,52 under the control of not shown control part, processing overlaps.In the processing that overlaps, pinch clamp roll cylinder 51,52 and clamp film 3a or subsequent thin film 3b in advance, each film 3a, 3b are carried to the contrary direction of direction A or direction A, make in advance the position of the position of the rearward end 3ax of film 3a and the leading section 3bx of subsequent thin film 3b become as illustrated in fig. 5 supporting surface 55 Shangdis and regulate.The overlapping lap 60 of the leading section 3bx of the rearward end 3ax of film 3a and subsequent thin film 3b is formed on supporting surface 55 like this, in advance.

(ultrasonic bonding equipment)

The frictional heat that ultrasonic bonding equipment 53 utilizes mechanical oscillation to cause, deposited target body, possesses oscillator 65, cantilever 66 and oscillator 67.Under the control of not shown control part, oscillator 67 makes oscillator 65 mechanically vibrate with the frequency (10kHz～50kHz) of regulation.The result of the vibration sympathetic response of cantilever 66 and oscillator 65, in the upper vibration of thickness direction (hereinafter referred to as direction C) of film 3.

Ultrasonic bonding equipment 53 is installed on press section 71 via installing component 70.Press section 71, under the control of control part, moves freely ultrasonic bonding equipment 53 on direction C.

In addition, press section 71 moves up in A side and is arranged at freely the first slide mechanism 72.And then the first slide mechanism 72 is mobile second slide mechanism 73 that is arranged at freely on direction B.The second slide mechanism 73 comprises: rotate a pair of pulley 76 that arranges freely, at this pair of pulley 76, set up with 77 and this pulley 76 is rotated to the control part (not shown) of ormal weight degree to the direction of regulation.Like this, utilize the first slide mechanism 72 and the second slide mechanism 73, ultrasonic bonding equipment 53 is moved freely on direction A and direction B.

Ultrasonic bonding equipment 53 and base 54, under the control of control part, move freely between the retreating position of holding the clip position of lap 60 with the pressure clamp of regulation and keeping out of the way from clip position.In the situation that not carrying out bonding process, ultrasonic bonding equipment 53 and base 54 are positioned at retreating position, only in the situation that carrying out bonding process, to clip position, move.

Secondly, the joining process of utilizing junction surface 11 to carry out is described.As shown in Figures 1 and 5, film unloading part 10 in advance film 3a 11 is carried from film roll 14 to junction surface, pinch clamp roll cylinder 51,52 in advance film 3a to reservoir 5, send.Then, control part is detecting in the non-existent situation of film roll that is arranged at film launching position 16, and film unloading part 10, by turntable arm 13 Rotate 180 degree, is arranged at film launching position 16 by the film roll 15 that is positioned at volume core replacing position 17.Also have, from new film roll 15, send subsequent thin film 3b.

Pinch clamp roll cylinder 51,52 by the conveying of film 3a and subsequent thin film 3b in advance, carry out the contraposition of rearward end 3ax and leading section 3bx.The overlapping lap 60 of the leading section 3bx of the rearward end 3ax of film 3a and subsequent thin film 3b is formed on supporting surface 55 like this, in advance.

Ultrasonic bonding equipment 53 and base 54 set in advance in retreating position.The first slide mechanism 72 and the second slide mechanism 73 are based in the interior predefined deposited region of lap 60, and the position of the regulation on supporting surface 55 arranges ultrasonic bonding equipment 53.

Then, utilize control part, be positioned in the ultrasonic bonding equipment 53 of retreating position and situation that base 54 moves to clip position, lap 60 is by cantilever 66 and supporting surface 55 clampings, lap 60 vibrations.Also have, by the vibration of lap 60, between the rearward end 3ax of film 3a and the leading section 3bx of subsequent thin film 3b, producing in advance the result of frictional heat, the part of the cantilever 66 being vibrated and supporting surface 55 clampings and near rearward end 3ax and leading section 3bx thereof are deposited.

And then the first slide mechanism 72 and the second slide mechanism 73, in deposited region, make ultrasonic bonding equipment 53 move along direction B or direction A.Thus, the result that cantilever 66 contacts with the whole region of lap 60 in deposited region, deposited end in whole region, deposited region, rearward end 3ax and leading section 3bx.

In whole region, deposited region, after the deposited end of rearward end 3ax and leading section 3bx, press section 71 makes ultrasonic bonding equipment 53 and base 54 move to retreating position.Like this, in the deposited region of the expectation that junction surface 11 can be in lap 60, carry out the deposited of rearward end 3ax and leading section 3bx.

In the present invention, as shown in Figure 7, the center side to direction B in lap 60, from retaining zone 3w away from part set deposited region 60y, in the direction B both sides of deposited region 60y, set not deposited region 60z, at deposited region 60y, carry out joining process.Even carry out stretch processing to having passed through the film 3 of such joining process, the not deposited region 60z between retaining zone 3w and deposited region 60y can be out of shape in the same manner with the film 3 that does not form lap 60.

Thereby, known according to the present invention, in stretch processing, can reduce as deflection poor that does not form the part of lap 60 in the deflection of lap 60 integral body and film 3, its result, can suppress the fracture of the film 3 that both difference of deflection in stretching process causes.

More than 0.05 times of the width W 1 of the interval CL1 preferred film 3 of the retaining zone 3w on direction B and deposited region 60y and below 0.25 times, for example, preferably below the above 600mm of 50mm.More than 0.5 times of the width W 1 of the length Wy preferred film 3 of the direction B of deposited region 60y and below 0.9 times, for example, preferably more than 600mm and below 2200mm.The length L 1 of the direction A of lap 60 is for example preferably more than 10mm and below 40mm.

(deposited condition)

In joining process, the joint merit W of per unit thickness _tHpreferably more than 0.4W/ μ m and below 1.1W/ μ m, more preferably more than 0.6W/ μ m and below 0.9W/ μ m.If engage merit W _tHmore than 0.4W/ μ m, compare with the situation that is less than 0.4W/ μ m, deposited vibration is easily transmitted to lap 60 fully, and its result, can carry out the deposited of rearward end 3ax and leading section 3bx more reliably.If engage merit W _tHbelow 1.1W/ μ m, to compare with the situation that is greater than 1.1W/ μ m, the vibration of lap 60 can be not excessive, and therefore, its result can prevent fracture.The joint merit W of per unit thickness _tHbeing the merit amount W that gives to lap 60 of cantilever 66 obtains divided by the thickness of a slice film 3.

In joining process, put on the pressure P of the per unit thickness of lap 60 _tHpreferably 1.0 * 10 ^-3mPa/ μ m is above and 3.5 * 10 ^-3below MPa/ μ m.If the pressure P of per unit thickness _tHbe 1.0 * 10 ^-3more than MPa/ μ m, be less than 1.0 * 10 ^-3the situation of MPa/ μ m is compared, and deposited vibration is easily transmitted to lap 60 fully, and its result, can carry out the deposited of rearward end 3ax and leading section 3bx more reliably.On the other hand, if the pressure P of per unit thickness _tHbe 3.5 * 10 ^-3below MPa/ μ m, be greater than 3.5 * 10 ^-3the situation of MPa/ μ m is compared, and it is excessive that the vibration of lap 60 can not become, and its result can prevent fracture.The pressure P of per unit thickness _tHbeing cantilever 66 pressure P of giving to lap 60 obtains divided by the thickness of a slice film 3.

The cantilever amplitude f of described per unit thickness in deposited _tHpreferably more than 0.35 and below 0.7.If the cantilever amplitude f of per unit thickness _tHbe more than 0.35, compare with the situation that is less than 0.35, deposited vibration is easily transmitted to lap 60 fully, and its result, can carry out the deposited of rearward end 3ax and leading section 3bx more reliably.On the other hand, if the cantilever amplitude f of per unit thickness _tHbe below 0.7, compare with the situation that is greater than 0.7, it is excessive that the vibration of lap 60 can not become, and its result can prevent fracture.The cantilever amplitude f of per unit thickness _tHthe amplitude f that is cantilever 66 obtains divided by the thickness of a slice film 3.

The preferred 2000mm of summation of the area of the part that rearward end 3ax and leading section 3bx are deposited ²above and 22000m ²below.

(film)

The width W 1 of film 3 is preferred more than 600mm, more preferably, more than 1300mm and below 2500mm, in the situation that being greater than 2500mm, also shows effect of the present invention.In addition, the thickness T H1 of film 3 is preferably more than 20 μ m and below 200 μ m, more preferably more than 30 μ m and below 100 μ m.

(deposited pattern)

The configuration pattern of the melt-coating part in deposited region 60y except very close to each other the pattern that comprehensive pattern (not shown) of melt-coating part is set, as shown in Figure 8 a plurality of melt-coating parts 80 that arrange at deposited region 60y is configured as island in the whole region of deposited region 60y, the pattern that can also arrange with lines for the melt-coating part 81 arranging at deposited region 60y as shown in Figure 9.Line image shown in Fig. 9 extends and arranges on direction B, but on direction A, extend arrange also can, direction A or with the direction of direction B with scissors junction on extend to arrange and also can.In addition, the quantity that the line image shown in Fig. 9 is set is not only two, also can be three, also can be one.

In the above-described embodiment, the central portion on direction B is set with deposited region 60y.But, the invention is not restricted to this, as shown in figure 10, at a pair of retaining zone 3w or set deposited region 60y than a pair of retaining zone 3w by the part of both ends side also can on direction B.

(deposited region)

In the above-described embodiment, the center side from retaining zone 3w to direction B is set with deposited region 60y away from the part of CL1 degree.But, the invention is not restricted to this.For example, in stretch processing, the degree that can extend along direction B as a whole with lap 60, sets deposited region 60y in a part for lap 60 and also can.

Setting example as deposited region 60y is divided into lap 60 the individual region of n (n is more than 2 natural number) on direction B, will be at the most (n-1) individual region be made as deposited region 60y, remaining region is made as to not deposited region 60z and also can.At this, the part that not deposited region 60z is preferably disposed in the film that forms lap 60, the amount of tension in stretch processing is large.Keep retaining zone 3w, the direction B that carries out film 3 goes up in the situation of the stretch processing stretching, and the central portion side of the amount of tension of the film 3 in this stretch processing from retaining zone 3w direction B diminishes gradually.Thereby, in the situation that carry out such stretch processing, from reducing as the aspect of difference of amount of tension that does not form the part of lap 60 amount of tension of lap 60 integral body and film 3, most preferably at the not deposited region 60z of the direction B of retaining zone 3w central portion side setting.

Also have, the setting example as the deposited region 60y in the present invention, is not limited to the mode shown in Fig. 7 or Figure 10.As other modes, as shown in figure 11, there is the mode that deposited region 60y is set at the two ends of the direction B of lap 60.

In addition, in lap 60, arrange in the situation of a plurality of deposited region 60y, as shown in figure 12, the position according to setting deposited region 60y, also can the length difference of the direction B of deposited region 60y.That is the length of the length of the deposited region 60ya that part that, the amount of tension in stretch processing is large the arranges deposited region 60yb that preferably part less than the amount of tension in stretch processing arranges is short.The length in the length in the not deposited region that part that equally, the amount of tension in stretch processing is large arranges the not deposited region that preferably part less than the amount of tension in stretch processing arranges is long.

In addition, in the above-described embodiment, in lap 60, on direction A, form a line and set deposited region 60y.But, the invention is not restricted to this, on direction A, arrange a plurality of row and set deposited region 60y and also can.Thereby the present invention as shown in figure 13, arranges deposited region 60y at lap 60 and also can.

In the above-described embodiment, on the width of film 3, carried out stretch processing, but the invention is not restricted to this.In this case, also on draw direction, lap 60 is divided into a plurality of regions, at least one region is made as to not stretch zones, remaining region is made as to deposited region and also can.

In the above-described embodiment, use the supporting surface 55 and the cantilever 66 that implement annular knurl processing, established part in clamping lap 60, has carried out joining process, but the invention is not restricted to this.The viewpoint preventing from the fracture of film 3, utilizes the part of cantilever 66 and supporting surface 55 clampings with respect to face, preferably line or point.Known above, as the supporting surface of base 54, can be for smooth face, at smooth face, be provided with the face of lines groove, the face of projection that is provided with wire and any of the supporting surface shown in Fig. 6 55, but supporting surface 55 the bests shown in Fig. 6.

In the above-described embodiment, the cantilever 66 that use is vibrated on direction C, has carried out the joining process of lap 60, but the invention is not restricted to this, the cantilever 66 vibrating in the direction that use intersects at direction A, direction B or with direction A, the joining process of carrying out lap 60 also can.

In addition, in the above-described embodiment, use ultrasonic bonding equipment 53, carried out joining process, but the invention is not restricted to this, as heat seal machine etc., heat release head is contacted with the deposited region of regulation, carry out joining process also can, in the deposited region of the regulation of rearward end 3ax or leading section 3bx, applied after solvent (acetone etc.), rearward end 3ax and leading section 3bx are overlapped, and deposited rearward end 3ax and leading section 3bx also can.

In the above-described embodiment, at lap 60, be set with not deposited region 60z.But, the invention is not restricted to this, in stretch processing, as long as the degree that lap 60 can stretch as a whole on direction B is just carried out low joining process and also can in not deposited region 60z.In low joining process, with common joining process in the same manner, the rearward end 3ax of deposited lap 60 and leading section 3bx.But described deposited degree is lower than common joining process.The condition of low joining process is less than the condition of common joining process.Use ultrasonic bonding equipment, carry out in the situation of low joining process, engage merit W _tHmore than preferred 0.1W/ μ m and below 0.4W/ μ m, the pressure P of per unit thickness _tHpreferably 0.1 * 10 ^-3mPa/ μ m is above and 1.0 * 10 ^-3below MPa/ μ m.

(solution film-forming method)

Film in above-mentioned embodiment (film and rear row film in advance) can obtain by solution film-forming method.Carry out the solution film-forming equipment 210 of solution film-forming method as shown in figure 14, have: storage tank 211; Stream is moulded chamber 212; Pin stenter 213; Hothouse 215; Cooling chamber 216; Coiling chamber 217.

Storage tank 211 possesses: the stirring vane 211b rotating by motor 211a; Cover 211c.Internal storage at storage tank 211 has the polymer dissolution of the raw material that becomes film 3 in the adulterant 221 of solvent.Adulterant 221 in storage tank 211 is by cover 211c, and temperature is adjusted to constant.In addition, by the rotation of stirring vane 211b, in the time of the cohesion of inhibition polymer etc., adulterant 221 is remained to the quality of homogeneous.Pipe arrangement 222 connects storage tank 211 and stream mold 230.

Stream mould chamber 212 be provided with stream mold 230, as the stream of supporter mould drum 232, peel off cylinder 234, temperature-adjusting device 235,236 and decompression chamber 237.Stream is moulded drum 232 by having omitted illustrated drive unit, centered by axle 232a, along circumferentially (hereinafter referred to as direction Z1) rotation.Stream is moulded in chamber 212 and stream is moulded drum 232 and utilized temperature-adjusting device 235,236, is set as flowing the temperature of plastic film 233 easy cooling curings (gelation).

Stream mold 230 has extends the slit forming on width.The side face 232b ejection adulterant 221 of drum 232 is moulded in stream mold 230 towards the stream of rotation from slit.Then, the adulterant 221 of moulding the circumferential surface 232b of drum 232 from stream forms stream plastic films 233.Also have, stream mould drum 232 rotations approximately 3/4 during, the self-supporting showing based on gel at stream plastic film 233, stream plastic film 233, by peeling off cylinder 234, is moulded drum 232 from stream and is peeled off, and forms wetting film 238.The residual solvent amount of the stream plastic film 233 while peeling off is preferably more than 150 % by weight and below 320 % by weight.At this, residual solvent amount will illustrate with dry basis in residual solvent amount such as stream plastic film 233 etc., and its assay method is to take sample from the film of object etc., and the weight of this sample is made as to x, when being dried the weight after sample and being made as y, utilize that { calculate (x-y)/y} * 100.

Decompression chamber 237, with respect to stream mold 230, is disposed at the upstream side of direction Z1, will in decompression chamber 237, remain negative pressure, stream is moulded to the back side (moulding with stream the face that the circumferential surface 232b of the drum 232 contact afterwards) pressure of side decompression for expecting of pearl.By stream, mould the decompression of the rear side of pearl, can reduce to mould by stream the impact of following wind that the rotation of drum 232 produces, at stream mold 230 and stream, mould and between drum 232, form stable stream and mould pearl, form the few stream plastic film 233 of uneven film thickness.

The raw material that the material of stream mold 230 has high corrosion resistance and low coefficient of thermal expansion by the mixed liquor with respect to electrolyte aqueous solution, carrene or methyl alcohol etc. form.Preferably using the fine finishining precision of the liquid contact surface of stream mold 230 is below 1 μ m by surface roughness, and linearity is the stream mold below 1 μ m/m in any one direction.

The circumferential surface 232b that stream is moulded drum 232 has been implemented the processing of chromium plating, has sufficient corrosion resistance.In addition, temperature-adjusting device 236 remains the temperature of expectation for stream being moulded to the temperature of the circumferential surface 232b of drum 232, makes heat transfer medium mould drum 232 circulations to stream.Heat transfer medium remains the temperature of expectation, by stream, moulds the heat transfer medium stream in drum 232, and the temperature that stream is moulded the circumferential surface 232b of drum 232 thus remains the temperature of expectation.

The width that stream is moulded drum 232 without particular limitation of, but the stream that preferably uses the stream of adulterant to mould the scope of 1.1 times～2.0 times of width is moulded drum 232.Stream is moulded the preferred stainless steel of material of drum 232, more preferably has the SUS316 system of sufficient corrosion resistance and intensity.At stream, mould more than chromium plating that the circumferential surface 232b of drum 232 implements processes preferred Vickers hardness Hv700 so-called hard chromium platings more than thickness 2 μ m.

In addition, the retracting device 240 that possesses the condenser (condenser) 239 of the solvent just evaporating for condensed fluidization and the solvent of recovery condensed fluid in stream is moulded chamber 212.Utilize the solvent of condenser 239 condensations to reclaim by retracting device 240.Described solvent is after regenerating unit regeneration, and as adulterant, preparation recycles with solvent.

The downstream of moulding chamber 212 at stream is disposed with transition part 241, pin stenter 213.In transition part 241, conveying cylinder 242 imports pin stenter 213 by wetting film 238.Pin stenter 213 has a plurality of needle plates that connect the edge, both sides of wetting film 238 and keep, and this needle plate is advanced in orbit.To the wetting film 238 of advancing by needle plate, carry dry wind, dry wetting film 238, becomes film 220.

In the downstream of pin stenter 213, be respectively arranged with trimming device 243.The edge, both sides of trimming device 243 severing films 220.Pulverizer 244, by air-supply, is sent in the edge, both sides of this severing, is pulverized, as the raw material recycling of adulterant etc.

At hothouse 215, be provided with a plurality of cylinders 247, coiled film 220 on these and carrying.The absorbing recovery device 248 that hothouse 215 reclaims with the solvent of absorption evaporation is connected.Outlet side at hothouse 215 is provided with cooling chamber 216, at cooling chamber 216, film 220 is cooled to room temperature.In the downstream of cooling chamber 216, be provided with and force Destaticizing device (destaticing rod) 249, film 220 is destaticed.And then, in the downstream of forcing Destaticizing device 249, be provided with annular knurl and give cylinder 250, to the edge, both sides of film 220, give annular knurl.At coiling chamber 217, be provided with the up-coiler 251 with mold pressing cylinder 252, film 220 is wound in to volume core with roller shape, utilize up-coiler 251, obtain film roll 255.Film roll 255 is contained in the film reception room 4 (with reference to Fig. 1) of off-line stretcher 2 as film roll 14,15 from coiling chamber 217.

(polymer)

Below, the polymer as the raw material of film is described.In the present embodiment, as polymer, use cellulose acylate, as cellulose acylate, preferred cellulose triacetate (TAC) especially.Also have, in cellulose acylate, more preferably the substitution value of the cellulosic acyl group to hydroxyl meets whole cellulose acylate of following formula (I)～(III).Also have, in following formula (I)～(III), A and B represent the substitution value with respect to the hydrogen atom in cellulosic hydroxyl, the substitution value that A is acetyl group, and B is that carbon number is the substitution value of 3～22 acyl group.Also have, preferably 90 % by weight of TAC are the particle of 0.1～4mm above.But, can be used in polymer of the present invention and be not limited to cellulose acylate.

(I) 2.5≤A+B≤3.0

(II) 0≤A≤3.0

(III)0≤B≤2.9

The glucose unit that forms the combination of cellulosic β-Isosorbide-5-Nitrae has hydroxyl freely at 2,3 and 6.Cellulose acylate is to utilize more than 2 acyl group of carbon number, esterification these part or all polymer (polymer) of hydroxyl.Acyl substituted degree refers to respectively 2,3 and 6, the ratio of cellulosic hydroxy esterification (situation of 100% esterification is made as substitution value 1).

Total acyl substituted degree is the value preferably 2.00～3.00 of DS2+DS3+DS6, more preferably 2.22～2.90, especially preferably 2.40～2.88.In addition, the value of DS6/ (DS2+DS3+DS6) is preferably more than 0.28, more preferably more than 0.30, and especially preferably 0.31～0.34.At this; DS2 is that the hydrogen of the hydroxyl of 2 in glucose unit is (following by the ratio of acyl substituted; be called the acyl substituted degree of 2); DS3 be the hydrogen of the hydroxyl of 3 in glucose unit by the ratio of acyl substituted (hereinafter referred to as the acyl substituted degree of 3), DS6 is that the hydrogen of the hydroxyl of 6 in glucose unit is by the ratio of acyl substituted (hereinafter referred to as the acyl substituted degree of 6).

The acyl group using in cellulose acylate of the present invention can be only a kind of, or uses two or more acyl groups also can.When using two or more acyl groups, preferably one is acetyl group.The summation of the degree that 2,3 and 6 s' hydroxyl is replaced by acetyl group is made as DSA; 2,3 and 6 s' hydroxyl is made as in the situation of DSB by the summation of the degree of the acyl substituted beyond acetyl group; the value of DSA+DSB preferably 2.22～2.90, especially preferably 2.40～2.88.

In addition, DSB is preferably more than 0.30, especially preferably more than 0.7.And then preferably it more than 20% is the substituting group of 6 hydroxyls to DSB, more preferably more than 25%, and then preferably more than 30%, especially preferably more than 33%.And then; the value of DSA+DSB in 6 of cellulose acylate is more than 0.75, and then preferably more than 0.80, especially also preferred more than 0.85 cellulose acylate; by using these cellulose acylates, can make the solution that dissolubility is more superior (adulterant).Especially, use in the situation of chlorine-free organic solvent, can make and show superior dissolubility, the adulterant that low viscosity and filterability are superior.As the cellulose of the raw material of cellulose acylate, can be obtained by any of cotton linters, paper pulp.

Acyl group as the carbon number of the cellulose acylate in the present invention more than 2, can be fatty group, can be also aryl, without particular limitation of.For example, can enumerate cellulosic alkyl-carbonyl ester, alkenyl carbonyl ester, aromatic series carbonyl ester, aromatic series alkyl-carbonyl ester etc., respectively so that the group with replacement also can.As these preferred example, can enumerate propiono, bytyry, valeryl, caproyl, caprylyl, capryl, dodecane acyl group, tridecane acyl group, tetradecane acyl group, hexadecane acyl group, octadecanoyl, isobutyryl, tertiary bytyry, cyclohexane carbonyl, oleoyl, benzoyl, naphthyl carbonyl, cinnamoyl etc.Wherein, more preferably propiono, bytyry, dodecane acyl group, octadecanoyl, tertiary bytyry, oleoyl, benzoyl, naphthyl carbonyl, cinnamoyl etc., especially preferably propiono, bytyry.

About the details of cellulose acylate, be recorded in [0140] paragraph of No. 2005-104148, JP in [0195] paragraph, these records also go in the present invention.In addition, about solvent and plasticizer, deterioration preventing agent, ultra-violet absorber (UV agent), optical anisotropy controlling agent, delay controlling agent, dyestuff, roughening agent, remover, peel off the additives such as promoter, at length be recorded in too [0196] paragraph of No. 2005-104148, JP in [0516] paragraph, these are recorded and also go for the present invention.

(solvent)

Solvent as preparation adulterant, (for example can enumerate aromatic hydrocarbon, benzene, toluene etc.), halogen hydrocarbon (for example, carrene, chlorobenzene etc.), alcohol (for example, methyl alcohol, ethanol, normal propyl alcohol, n-butanol, diethylene glycol etc.), ketone (for example, acetone, butanone etc.), ester (for example, methyl acetate, ethyl acetate, propyl acetate etc.) and ether (for example, oxolane, methylcellulose etc.) etc.Also have, in the present invention, adulterant refers to polymer dissolution or is scattered in polymer solution, the dispersion liquid obtaining in solvent.

Wherein, preferably use the halogen hydrocarbon of carbon number 1～7, most preferably use carrene.From the dissolubility of TAC, the fissility of self-supporter of stream plastic film, the viewpoint of the physical property such as optical characteristics of the mechanical strength of film etc. and film preferably, except carrene, is mixed the alcohol of one or more carbon numbers 1～5.The content of alcohol is preferably 2 % by weight～25 % by weight with respect to solvent integral body, more preferably 5 % by weight～20 % by weight.As the concrete example of alcohol, can enumerate methyl alcohol, ethanol, normal propyl alcohol, isopropyl alcohol, n-butanol etc., but preferably use methyl alcohol, ethanol, n-butanol or these mixture.

; recently; for the impact on environment being suppressed for minimal object; to not using the solvent of the situation of carrene to form also progress, inquire into; for this object, preferably using carbon number is 4～12 ether, the ketone that carbon number is 3～12, the ester that carbon number is 3～12, the alcohol that carbon number is 1～12.Sometimes suitably mix and use these.For example, can enumerate the mixed solvent of methyl acetate, acetone, ethanol, n-butanol.These ethers, ketone, ester and alcohol have circulus and also can.In addition, any the compound that has a functional group (-O-,-CO-,-COO-and-OH) of two above ethers, ketone, ester and alcohol also can be used as solvent.

In the above-described embodiment, as the polymer that becomes the raw material of film, illustrate and use cellulose acylate, but be not limited to this, can also be suitable for cyclic olefin, other cellulose esters, such as cellulose ethanoate propionic ester etc.In addition, also go for utilizing the thin polymer film of solution film-forming method manufacture.

(solution film-forming equipment)

Secondly, the manufacturing equipment (hereinafter referred to as solution film-forming equipment) that utilizes solution film-forming method to manufacture thin polymer film is described.Melting membrane equipment 410 as shown in figure 15, is the device of manufacturing the thermoplastic film F can be used in liquid crystal indicator etc.Raw-material graininess thermoplastic resin as thermoplastic film F is imported to drying machine 412 and after dry, utilizes extruder 414 to extrude this particle, utilize gear pump 416 to supply with to filter 418.Secondly, utilize filter 418 to filter foreign matter, from die head 420 resin melt extrusions (thermoplastic resin of melting).Molten resin is by the first casting roll 428 and touch roll 424 double teams, after extrusion molding, utilize the first casting roll 428 to carry out cooling curing, form the film-form of the surface roughness of regulation, and then utilize the second casting roll 426, the 3rd casting roll 427 to carry, obtain thus non-stretched film Fa.This non-stretched film Fa in this stage, reel also can, to the horizontal extension section 442 that carries out continuously long span stretching, also can.In addition, the non-stretched film Fa once reeling is supplied with to horizontal extension section 442, also obtain the effect identical with situation about supplying with to the horizontal extension section 442 that carries out continuously long span stretching.

In horizontal extension section 442, non-stretched film Fa, in the upper stretching of the width (hereinafter referred to as direction Y) with throughput direction (hereinafter referred to as direction X) quadrature, is formed to horizontal oriented film Fb.The upstream side of horizontal extension section 442 arrange preheating part 436 also can, in the downstream of horizontal extension section 442, thermosetting bonding part 444 is set and also can.Thus, can reduce the Boeing curved surface (skew of ボ mono-イ Application グ, optic axis) in stretching.Preferably preheat temperature is higher than horizontal draft temperature, and heat fixation temperature is lower than horizontal draft temperature.That is, conventionally, with regard to Boeing curved surface, width central portion becomes recessed towards direction of advance, but by being made as the horizontal draft temperature of preheat temperature >, horizontal draft temperature > heat fixation temperature, can reduce Boeing curved surface.With regard to the pre-heat treatment, heat fixation temperature, can carry out either party, carry out two sides and also can.

After horizontal stretching, carried out after heat treatment, in thermal treatment zone 446, horizontal oriented film Fb has been shunk along direction X.In thermal treatment zone 446, as shown in figure 16, do not utilize fixture to keep, under the state of side end of horizontal oriented film Fb, not causing the contraction of direction Y, only cause direction X contraction utilize a plurality of roller 448a～448d to carry horizontal oriented film Fb.Now, as shown in figure 17, the ratio (G/D) that a plurality of roller 448a～448d are configured to length (G) between the roller lap of splice (D) and roller is more than 0.01 and below 3.Thus, by the friction of horizontal oriented film Fb and each roller 448a～448d, suppress the contraction of direction Y.Also have, horizontal oriented film Fb is heat-treated when the ratio (V2/V1) of the circumferential speed (V1) of the roller 448a based on upstream side and the circumferential speed (V2) of the roller 448d based on downstream is to carry under the condition more than 0.6 and below 0.999.That is, horizontal oriented film Fb shrinks along direction X in thermal treatment zone.

By the horizontal oriented film Fb of heat treatment in thermal treatment zone, the manufacture angle of orientation, the slow end article being conditioned are thermoplastic film F.Utilize winder 449 these film F of coiling.The film F of reeling forms roller shape, is arranged at the film reception room 4 (with reference to Fig. 1) of stretcher 2 as film roll 14,15.

Before or after stretching on direction Y, the stretching of travel direction X also can.The stretching of direction X is can be by using a plurality of nip rolls of pinching of arranging on direction X to carrying out handle thin films, with respect to upstream side pinch the right circumferential speed of nip rolls, accelerate pinching nip rolls right circumferential speed being realized of downstream.According to the size of the ratio (L/W) of the thin-film width W that pinches nip rolls centering that pinches distance (L) between nip rolls and upstream side on direction X, stretching mode is different, if L/W is little, can adopt in JP 2005-330411 communique, JP 2006-348114 communique, record and so on the stretching mode of direction X.Which easily makes R _tHbecome large, but can make device compact.On the other hand, in the situation that L/W is large, can adopt that JP 2005-301225 communique records and so on the stretching mode of direction X.Which can reduce R _tH, but device easily becomes greatly.

Operable polymer in solution film-forming method is so long as thermoplastic resin, just without particular limitation of, for example, can enumerate cellulose acylate, containing lactonic ring polymer, cyclic olefin, Merlon etc.Wherein preferably cellulose acylate, cyclic olefin, wherein preferably comprise the cellulose acylate of acetate groups, propionic acid ester group, the cyclic olefin obtaining by addition polymerization, and then the cyclic olefin preferably obtaining by addition polymerization.

(cyclic olefin)

Cyclic olefin is preferably by norbornene-based polymer polymerization.This polymerization can also be undertaken by any method of ring-opening polymerisation, addition polymerization.As addition polymerization, for example, can enumerate the addition polymerization of recording in addition polymerization that special permission records in No. 3517471 communiques or No. 3559360 communiques of special permission, No. 3867178 communiques of special permission, No. 3871721 communiques of special permission, No. 3907908 communiques of special permission, No. 3945598 communiques of special permission, special table 2005-527696 communique, JP 2006-28993 communique, No. 2006/004376 handbook of International Publication.Especially preferred is the addition polymerization of recording in No. 3517471 communiques of special permission.

As ring-opening polymerisation, can enumerate the ring-opening polymerisation of recording in No. 98/14499 handbook of International Publication, No. 3060532 communiques of special permission, No. 3220478 communiques of special permission, No. 3273046 communiques of special permission, No. 3404027 communiques of special permission, No. 3428176 communiques of special permission, No. 3687231 communiques of special permission, No. 3873934 communiques of special permission, No. 3912159 communiques of special permission.Wherein, the ring-opening polymerisation that preferably No. 98/14499 handbook of International Publication, special permission are recorded in No. 3060532 communiques.

In these cyclic olefins, the more preferably cyclic olefin of addition polymerization.

(containing lactonic ring polymer)

Refer to the polymer with the lactonic ring structure being represented by following (general formula 1).

[changing 1]

(general formula 1)

In (general formula 1), R ¹, R ², R ³the organic residue that represents independently respectively hydrogen atom or carbon number 1～20.Also have, organic residue contains oxygen atom also can.

The lactonic ring structure of (general formula 1) containing proportional preferably 5～90 % by weight, more preferably 10～70 % by weight, and then preferred 10～50 % by weight.

Except the lactonic ring structure being represented by (general formula 1), the constitutional unit (constitutional repeating unit) of preferably will be selected from (methyl) acrylate, hydroxyl monomer, unsaturated carboxylic acid, being constructed by least one polymerization of the monomer of following (general formula 2) expression.

[changing 2]

(general formula 2)

In (general formula 2), R ⁴represent hydrogen atom or methyl, X represents alkyl, aryl ,-OAc base ,-CN the base ,-CO-R of hydrogen atom, carbon number 1～20 ⁵base or-C-O-R ⁶base, Ac basis representation acetyl group, R ⁵and R ⁶the organic residue that represents hydrogen atom or carbon number 1～20.

For example, can use the material of recording in No. 2006/025445 handbook of International Publication, JP 2007-70607 communique, JP 2007-63541 communique, JP 2006-171464 communique, JP 2005-162835 communique.

Claims (7)

1. a drawing process for polymer film, is characterized in that, comprises the following steps, that is:

The lap of deposited the first polymer film and the second polymer film and the step of making a series of junction film, wherein, described the first polymer film in advance, described the second polymer film is follow-up in described the first polymer film, described lap is the rear end of length direction of described the first polymer film and the overlapping part of front end of the length direction of described the second polymer film, described lap is divided into a plurality of regions at the width of described junction film, described deposited be in described a plurality of regions, to remove in the remaining region at least one region to carry out; And

The stretch step of described junction film, wherein, described stretching is to keep the retaining zone of described junction film to carry out by a pair of holding member, the both side ends that described retaining zone is described junction film;

The direction of described stretching is the width of described junction film,

Wherein, in described lap, the center side from described retaining zone to described width away from part set deposited region, not deposited region is set in the described width both sides in deposited region, in described deposited region, carries out described deposited.

2. the drawing process of polymer film according to claim 1, wherein,

The retaining part with utilizing described a pair of holding member to keep away from part carry out described deposited.

3. the drawing process of polymer film according to claim 1, wherein,

In a plurality of positions in described region, carry out described deposited.

4. the drawing process of polymer film according to claim 1, wherein,

More than 0.5 times and below 0.9 times of the length W that the length of deposited described region in the direction of described stretching is described lap.

5. the drawing process of polymer film according to claim 1, wherein,

From utilize retaining part that described holding member the keeps center side along the direction of described stretching to described lap away from part, carry out described deposited.

6. a manufacture method for thin polymer film, comprises the following steps, that is:

Make the step of the first polymer film;

Make the step of the second polymer film;

The step that described the first polymer film is advanced;

Continuously in described the first polymer film, the step that described the second polymer film is advanced;

The lap of deposited the first polymer film and the second polymer film and the step of making a series of junction film, wherein, described lap is the rear end of length direction of described the first polymer film and the overlapping part of front end of the length direction of described the second polymer film, described lap is divided into a plurality of regions at the width of described junction film, described deposited be in described a plurality of regions, to remove in the remaining region at least one region to carry out; And

Stretch described junction film and form the step of described thin polymer film, wherein, described stretching is to keep the retaining zone of described junction film to carry out by a pair of holding member, the both side ends that described retaining zone is described junction film,

The direction of described stretching is the width of described junction film,

Wherein, in described lap, the center side from described retaining zone to described width away from part set deposited region, not deposited region is set in the described width both sides in deposited region, in described deposited region, carries out described deposited.

7. the manufacture method of thin polymer film according to claim 6, wherein,

From utilize retaining part that described holding member the keeps center side along the direction of described stretching to described lap away from part carry out described deposited.