CN102744851A - Crystalline resin film manufacturing method and crystalline resin film manufacturing device - Google Patents
Crystalline resin film manufacturing method and crystalline resin film manufacturing device Download PDFInfo
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- CN102744851A CN102744851A CN2012101131951A CN201210113195A CN102744851A CN 102744851 A CN102744851 A CN 102744851A CN 2012101131951 A CN2012101131951 A CN 2012101131951A CN 201210113195 A CN201210113195 A CN 201210113195A CN 102744851 A CN102744851 A CN 102744851A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/918—Thermal treatment of the stream of extruded material, e.g. cooling characterized by differential heating or cooling
- B29C48/9185—Thermal treatment of the stream of extruded material, e.g. cooling characterized by differential heating or cooling in the direction of the stream of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
- B29C48/87—Cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/91—Heating, e.g. for cross linking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
- B29C48/914—Cooling of flat articles, e.g. using specially adapted supporting means cooling drums
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- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
A molten sheet (S), which is molded by extruding molten crystalline resin from a T-shaped die head (12), is surrounded by a protective cover (50) with an open part (52) and meanwhile is conveyed by a metal elastic roll (14) and casting rolls (16) (18), so as to be cooled and solidified. Even for a molten sheet (S) which is formed by crystalline resin with large thermal gradient and great wind effect, by surrounding the molten sheet (S) via the protective cover (50), the wind effect can be reduced to get a crystalline resin film with excellent uniformity. The protective cover (50) has the open part (52), so that the temperature of the T-shaped die head (12) becomes easy to control, so that the crystalline resin film with excellent uniformity can be obtained. The structure where the molten sheet (S) is only surrounded by the protective cover allows cheap devices to be manufactured, compared with a structure using inert gas.
Description
Technical field
The present invention relates to crystalline resin film-forming method and crystalline resin apparatus for manufacturing thin film, thereby particularly relate to crystalline resin film-forming method and the crystalline resin apparatus for manufacturing thin film that carries out cooling curing through the molten sheet that utilizes the roller conveyance to form by the crystalline resin moulding of fusion.
Background technology
In order to improve contrast and visual angle, for as optical thin films such as the phase retardation film of the component parts of liquid crystal indicator (liquid crystal panel) and polaroid protective film, demanding optics homogenieity.
Here, through with molecule along the mode of equidirectional and same degree ground orientation, the phase retardation film that has orientation is not basically stretched with the blank film, thereby the manufacturing phase retardation film.That is to say,, form the evenly phase retardation film of performance of desired phase difference through the control axis of orientation and the degree of orientation.Therefore, the phase retardation film before stretching there is following requirement with the blank film: in film itself, do not exist flake and pit perhaps to be called as the defectives such as striped of die line; High transparent; Thickness deviation is few; And there is not an orientation.
There is situation about making through following in phase retardation film with the blank film, promptly through utilizing the roller conveyance to extrude the crystalline resin of fusion and the molten sheet of moulding makes its cooling curing from the T die, makes phase retardation film thus and uses the blank film.Making under the situation of phase retardation film with the blank film with this method,, making the molten resin quench cooled of extruding from the T die, therefore needing to reduce roll temperature at needs in order to obtain the good film of the transparency.Thereby because the temperature difference of resin temperature and roll temperature becomes big, the environment of the air gap periphery between T die and the roller is instabilityization easily, becomes the uneven reason of film thickness.
Therefore; Disclose in the patent documentation 1 and be provided with the apparatus for manufacturing thin film that is described below; The chill roll of the thermoplastic resin cooling that it has the extruder the thermoplastic resin that makes molten condition being installed being extruded into the T die of film like, make film like, and be centered around the air gap portion between T die and the chill roll around curtain-shaped cover member.In the device of patent documentation 1, curtain-shaped cover member is configured to the air-tight state of the air gap portion for the influence of flow (wind) that do not receive extraneous air.In the patent documentation 1, locate to be provided with seal member etc., invade curtain-shaped cover member inside from the outside in the hope of preventing air etc. within the bounds of possibility in the bad mold joint of curtain-shaped cover member and the gap between curtain-shaped cover member and the device etc.
The prior art document
Patent documentation
Patent documentation 1: TOHKEMY 2006-150806 communique
Summary of the invention
Invent problem to be solved
Yet, when making the T die airtight, be unfavorable for the temperature control of T die as above-mentioned technology is said, there is the further possibility that worsens of the thickness and precision that makes film.Here, though consider the adjusted inert gas of temperature is full of in the curtain-shaped cover member, exist equipment to become large-scale defective.Particularly, using under the situation of polypropylene-based resin, do not expect to improve energetically the atmosphere temperature as crystalline resin.
The present invention accomplishes in view of above-mentioned problem, and its purpose is, the crystalline resin film-forming method and the crystalline resin apparatus for manufacturing thin film of crystalline resin film that can obtain the excellent in uniformity of thickness, optical characteristics with low cost equipment is provided.
The scheme that is used to deal with problems
The present invention is the crystalline resin film-forming method; It comprises following cooling curing operation: the crystalline resin of fusion is extruded and the molten sheet of moulding from the T die; When the guard shield that utilization has a peristome centers on, utilize roller to carry out conveyance, make its cooling curing.
According to this formation, in the cooling curing operation, the crystalline resin of fusion is extruded and the molten sheet of moulding from the T die, when the guard shield that utilization has a peristome centers on, utilize roller to carry out conveyance, make its cooling curing.Even receive the molten sheet that comprises crystalline resin of influence of the environmental change of the air gap periphery easily, center on through guard shield, also can reduce the influence of environmental change and obtain the crystalline resin film of the excellent in uniformity of thickness, optical characteristics.In addition; According to this formation, guard shield has peristome, even thereby in the cooling curing process the big molten sheet that comprises crystalline resin of thermograde of resin temperature and roll temperature; The temperature control of T die also becomes easily, can obtain the crystalline resin film of excellent in uniformity.In addition, in crystalline resin film of the present invention,, can enumerate phase difference R0 in the face, thickness direction phase difference value Rth and optical axis etc. as the above-mentioned optical characteristics of excellent in uniformity.
In the case, in the cooling curing operation, guard shield preferably has peristome on the direction of T die.
According to this formation; In the cooling curing operation; Guard shield uses the guard shield have at the peristome of the direction opening of above-mentioned T die, even thereby the big molten sheet that comprises crystalline resin of thermograde, through from peristome heat radiation at the direction opening of above-mentioned T die; The temperature control of T die becomes easily, can obtain the crystalline resin film of the excellent in uniformity of thickness, optical characteristics.
In addition, in the cooling curing operation, guard shield is that the temperature of cooling curing is promptly cooled off position a little around the molten sheet until the molten sheet of extruding from the T die preferably.
According to this formation, in the cooling curing operation, guard shield is that the temperature of cooling curing is promptly cooled off position a little around the molten sheet until the molten sheet of extruding from the T die.Therefore, cover until the position of the cooling point that receives the environmental change influence easily, can obtain the crystalline resin film of the excellent in uniformity of thickness, optical characteristics through guard shield.In addition, constitute, need not cover the part of the influence that is not vulnerable to environmental change, thereby can improve operation property and process simple and low cost equipment through guard shield according to this.
In addition, in the cooling curing operation, guard shield preferably uses the guard shield that has with the wake shield, should be used to make the rotation of following roller and produces along the outer peripheral face of roller and not reach the molten sheet with wake with the wake shield.
According to this formation, in the cooling curing operation, guard shield uses has the guard shield with the wake shield, should be used to make the rotation of following roller and produces along the outer peripheral face of roller and not reach the molten sheet with wake with the wake shield.Thus, prevented to follow roller rotation touch the molten sheet with wake, can obtain the crystalline resin film of the excellent in uniformity of thickness, optical characteristics.
In addition, in the cooling curing operation, guard shield preferably uses the guard shield of the side shield with the side that covers the molten sheet.The side of molten sheet is meant the two ends of the width of the molten sheet that is extruded.
According to this formation, in the cooling curing operation, guard shield uses the guard shield of the side shield with the side that covers the molten sheet.Thus, can obtain the crystalline resin film of the excellent in uniformity of thickness, optical characteristics.
In addition, in the cooling curing operation, the molten sheet of preferably just having extruded from the T die through cramping between two rollers makes its cooling curing.
According to this formation, in the cooling curing operation, the molten sheet through cramping between two rollers has just been extruded from the T die makes its cooling curing.Through using two rollers to make its cooling curing, can improve the flatness of crystalline resin film of productivity ratio and the manufacturing of crystalline resin film.
In addition, in the cooling curing operation, the temperature of at least 1 outer peripheral face in preferred two rollers is below 30 ℃.
According to this formation, in the cooling curing operation, the temperature that makes at least 1 outer peripheral face in two rollers is below 30 ℃.Thus, can before crystalline growth, make the molten resin cooling curing of molten sheet, thereby can make the high crystalline resin film of the transparency.
In addition, in the cooling curing operation, preferably the molten sheet through utilizing 1 roller conveyance just to extrude from the T die carries out cooling curing.
According to this formation, in the cooling curing operation, the molten sheet through utilizing 1 roller conveyance just to extrude from the T die makes its cooling curing.Through utilizing 1 roller to make its cooling curing, the formation of device is become simple, and can reduce cost.In addition; In this constitutes; " the above-mentioned molten sheet through utilizing 1 above-mentioned roller conveyance just to extrude from above-mentioned T die makes its cooling curing " is meant that still the molten sheet of just having extruded from the T die at first carries out conveyance through 1 roller; In operation, also comprise form through other a plurality of roller conveyance molten sheets through the downstream behind this roller conveyance molten sheet.
In addition, in this constitutes, preferably after making its cooling curing, through roller and the rubber-like roller cramping film that is used for cooling curing with 1 roller.Thus, be difficult on roller, accumulating foreign matter, can obtain the high crystalline resin film of uniformity.
In addition, in the cooling curing operation, guard shield is preferably and uses the guard shield with inboard shield, and this inboard shield covers just the one side at least of the molten sheet of extruding from the T die.Preferred use is provided with the guard shield of inboard shield with the mode of each face of covering molten sheet.
Constitute according to this, guard shield is for using the guard shield with inboard shield, and this inboard shield covers just the one side at least of the molten sheet of extruding from the T die.Through utilizing inboard shield to cover just the one side of the molten sheet of the influence that receives wind easily of extruding from the T die, be preferably the two sides, can obtain the crystalline resin film of the excellent in uniformity of thickness, optical characteristics.
In the case, preferably further comprise following stretching process: stretch to make the crystalline resin film behind the molten sheet cooling curing through the cooling curing operation.
According to this formation,, stretch to make the crystalline resin film behind the molten sheet cooling curing through the cooling curing operation further through stretching process.Thus, can make the crystalline resin films such as phase retardation film that are stretched as specific thickness.
In addition, the present invention is the crystalline resin apparatus for manufacturing thin film, and it possesses: the T die that makes the moulding of molten sheet through the crystalline resin of extruding fusion; The molten sheet of extruding from the T die through conveyance makes the roller of its cooling curing; Guard shield around the molten sheet of extruding from the T die with peristome.
In the case, guard shield preferably has the peristome at the direction opening of above-mentioned T die.
In addition, guard shield is that the temperature of cooling curing is promptly cooled off position a little around the molten sheet until the molten sheet of extruding from the T die preferably.
In addition, guard shield preferably has with the wake shield, should be used to make the rotation of following roller and not reach the molten sheet along what the outer peripheral face of roller produced with wake with the wake shield.
In addition, guard shield preferably has the side shield, and this side shield covers the side of extruding direction of molten sheet.
In addition, roller preferably through the molten sheet after just extruding from the T die at cramping between two rollers, makes its cooling curing.
In addition, the temperature of at least 1 outer peripheral face in preferred two rollers is below 30 ℃.
In addition, roller is the molten sheet through utilizing 1 roller conveyance just to extrude from the T die preferably, makes its cooling curing.
In addition, the process of the molten sheet of just having extruded through 1 roller conveyance, preferably behind cooling curing, with roller and rubber-like roller cramping crystalline resin film from the T die.
In addition, guard shield preferably has inboard shield, and this inboard shield is used to cover just the one side at least of the molten sheet of extruding from the T die, more preferably has the inboard shield on the two sides that covers the molten sheet.
In addition, preferably further possess stretching device, it is to being stretched by the crystalline resin film behind the roller cooling curing.
The invention effect
According to crystalline resin film-forming method of the present invention and crystalline resin apparatus for manufacturing thin film, can obtain the crystalline resin film of excellent in uniformity with low cost equipment.
Description of drawings
Fig. 1 is the sketch map of the thin film fabrication system of expression the 1st embodiment of the present invention.
Fig. 2 is the figure of the peripheral formation of T die, metallic elastic roller and the chill roll of the device of presentation graphs 1.
Fig. 3 is the figure of formation of large span longitudinal stretching machine of the device of presentation graphs 1.
Fig. 4 is the sectional view of the nozzle of Fig. 3.
Fig. 5 is the figure that is illustrated in the perforation nozzle that uses in the cross directional stretch that utilizes the tentering method.
Fig. 6 is the schematic diagram of the thin film fabrication system of expression the 2nd embodiment of the present invention.
Fig. 7 is the schematic diagram of the thin film fabrication system of expression the 3rd embodiment of the present invention.
Fig. 8 is the schematic diagram of the thin film fabrication system of expression the 4th embodiment of the present invention.
Symbol description
1a; 1b; 1c; 1d... crystalline resin apparatus for manufacturing thin film, 6... stove, 6a... inlet, 6b... outlet, 10... extruder, 12...T die, 12a... ejiction opening, 14... metallic elastic roller, 14a... metal inner core, 14b... thin-wall metal urceolus, 14c... fluid beam barrel, 16; 18... casting roll, 19... touch roll, 20... nozzle, 20a... slit, 21... nozzle rows, 24... preheating zone, 26... stretch zones, 28... heat fixation zone, 30A; 30B; 32A, 32B... niproll, 31, proceeds posterolateral shield in 33... roller, 38... perforation nozzle, 38a... face, 51... side shield, 52... peristome, the place ahead, 53a... outside shield, the outer proceeds posterolateral shield of 53b..., the inboard the place ahead of 54a... shield, the 54b..., the accurate reductor motor of 60..., 100... thickness tester, above the 100a..., large span longitudinal stretching machine 101, S... molten sheet, F... film.
The specific embodiment
Below, the crystalline resin film-forming method and the crystalline resin apparatus for manufacturing thin film that relate to reference to description of drawings embodiment of the present invention.
As shown in Figure 1, the crystalline resin apparatus for manufacturing thin film 1a that the 1st embodiment of the present invention relates to possesses extruder 10, T die 12, metallic elastic roller 14, casting roll 16,18, guard shield 50, accurate reductor motor 60 and thickness tester 100.The crystalline resin apparatus for manufacturing thin film 1a of this embodiment is used for making phase retardation film through following mode; I.e. molten sheet S through utilizing the roller conveyance to form by the crystalline resin moulding; Carry out cooling curing; Film (phase retardation film the is used the blank film) F that does not stretch of the crystalline resin system of manufacturing, the film F that the once step stretching of going forward side by side does not stretch is made phase retardation film.
(the cooling curing operation of crystalline resin)
At first, the formation for T die 12, metallic elastic roller 14 and casting roll 16,18 peripheries among the crystalline resin apparatus for manufacturing thin film 1a describes.As shown in Figure 2, extruder 10 device for being described below: extrude in the time of to the polyolefin-based resins melting mixing that dropped into, with the polyolefin-based resins such as polypropylene (molten resin) of melting mixing to 12 conveyances of T die.
T die 12 is connected with extruder 10, and portion has and is used to make by the molten resin of the extruder 10 conveyances manifold (not shown) along the transverse direction expansion within it.In addition, be provided with in the bottom of T die 12 with when manifold is communicated with, make through the ejiction opening 12a of manifold along the molten resin ejection of transverse direction expansion.Therefore, the molten resin by the ejiction opening 12a of T die 12 ejection is formed as sheet.The ejiction opening 12a of the molten resin from T die 12 is preferably about 50mm～250mm to the length H by (so-called the air gap) between metallic elastic roller 14 and the casting roll 16 cramping molten resins.From the ejiction opening 12a of the molten resin of T die 12 to viewpoint by the temperature homogeneity of the width of the molten resin between metallic elastic roller 14 and the casting roll 16 cramping molten resins, further the length H of preferred air gap is 50mm～200mm.
The ejiction opening 12a of T die 12 (below, also be recited as lip portion) preferably implements sharpened edge (sharp edge) processing.Radius as the edge is preferably below the 50 μ m, further is preferably below the 30 μ m.
The gap of lip is not special to be limited, can be for below 1500 μ more than 500 μ.
In addition, be equipped with the bolt of the aperture that can adjust lip in the T die 12.Above-mentioned bolt can in the case, preferably use the thickness data that utilizes thickness tester 100 mensuration that are arranged at the downstream for through the scalable possible structure of thermal source, adjusts the lip aperture automatically.Before the operation of automatic adjustment thickness, from the thickness viewpoint of adjustment time, preferred manual adjustment lip aperture in advance.
Metallic elastic roller 14 has: the metal inner core 14a of high rigidity, be disposed at the outside of metal inner core 14a thin-wall metal urceolus 14b, be disposed at the inboard of metal inner core 14a fluid beam barrel 14c, be full of liquid in space and the fluid beam barrel 14c between metal inner core 14a and the thin-wall metal urceolus 14b, be used to regulate the adjustment means (not shown) of the temperature of liquid.Metal inner core 14a, thin-wall metal urceolus 14b and fluid beam barrel 14c set according to coaxial mode.In metal inner core 14a, be provided with a plurality of through holes (not shown) along its all direction.Therefore, liquid circulates in the inside of metallic elastic roller 14 according to the order in the space between fluid beam barrel 14c, through hole, metal inner core 14a and the thin-wall metal urceolus 14b.
Thin-wall metal urceolus 14b is formed by stainless steel etc., does not have bad mold joint on its surface, and has flexible.Therefore thin-wall metal urceolus 14b in the scope of the thin cylinder theory that can be suitable for Elasticity, has realized thin-walled property owing to have flexibility and flexible, the nerve approaching with caoutchouc elasticity.Liquid can use for example water, ethylene glycol, oil.Through utilizing not shown adjustment means that the temperature of liquid is regulated, regulated the surface temperature of thin-wall metal urceolus 14b indirectly.
In this embodiment, metallic elastic roller 14 is controlled as the temperature about 10～150 ℃, and casting roll 16,18 is controlled as the temperature below 30 ℃.As the temperature of metallic elastic roller 14, be preferably 80 ℃～150 ℃ especially.Turn back to Fig. 1, metallic elastic roller 14 is rotated through accurate reductor motor 60 control rotating speeds with casting roll 16,18.For the film F that does not stretch of the little crystalline resin system of the thickness deviation that obtains to flow to direction, accurate reductor motor 60 preferred planetary roller reductor or the planet-gear speed reducers of using.
When through metallic elastic roller 14 and casting roll 16,18 molten resin of molten sheet S being cured, the phase retardation film that forms crystalline resin system is used the blank film.The phase retardation film of this crystalline resin system is used the blank film, and it implements stretch processing etc. through utilizing large span longitudinal stretching machine etc., forms the phase retardation film of crystalline resin system.
(guard shield)
As shown in Figure 1, in this embodiment, the guard shield 50 that the molten sheet S that extrudes from T die 12 is had at the peristome of the direction opening of T die 12 centers on.Guard shield 50 has side shield 51, peristome 52, the place ahead, outside shield 53a and outer proceeds posterolateral shield 53b.
The represented side shield 51 of dotted line is used to cover the side of the molten sheet S that extrudes from T die 12 and the side (the both ends side of rotating shaft) of metallic elastic roller 14 and casting roll 16 among the figure.The top of side shield 51 is peristome 52 and is opened.It is the position that the temperature of cooling curing is promptly cooled off a T that the bottom of side shield 51 extends to general crystalline resin.Between the lower end of side shield 51 and metallic elastic roller 14 and casting roll 16, be provided with not shown gap, can distribute the inner heat of guard shield 50.
The material of guard shield 50 is not special to be limited, and can use for example metallic plates such as corrosion resistant plate, copper coin, aluminium sheet, plastic plate etc.In addition, the side shield 51 of guard shield 50, the place ahead, outside shield 53a and outer proceeds posterolateral shield 53b can be the tabular of for example no concave-convex, also can be tabular for the such ripple with wavy concavo-convex grade of wave mode plate.
(longitudinal stretching operation)
Large span longitudinal stretching machine 101 is used for making the film F that does not stretch be stretched as desirable thickness through the large span pulling method and makes phase retardation film.As shown in Figure 3, large span longitudinal stretching machine 101 mainly possesses: the entrance side niproll 30A of upstream side, 30B; The outlet side niproll 32A in downstream, 32B; Be disposed at stove 6 between these niprolls, that have a plurality of nozzles 20.
The film F that does not stretch is by entrance side niproll 30A, after 30B clamps, preferably by roller 31 by the for example horizontal conveyance of the inlet 6a of stove 6 in stove 6.Then, the film F behind the longitudinal stretching is discharged by the outlet 6b of stove 6, preferably by roller 33 by outlet side niproll 32A, after 32B clamps, be sent to the back operation.
Stove 6 begins mainly to be divided into from upstream side and can independently carry out temperature controlled preheating zone 24, stretch zones 26, heat fixation zone 28 threes respectively.And; According to the film F that does not stretch successively the preheating zone 24 of the preheating through mainly carrying out film F, mainly carry out film F longitudinal stretching stretch zones 26 and make longitudinal stretching after film F maintain set point of temperature with the stipulated time and effectively improve the mode in heat fixation zone 28 of the stability of optical characteristics such as phase difference and optical axis; At entrance side niproll 30A; 30B and outlet side niproll 32A set up non-stretched film F between the 32B.
Each zone in stove 6, with the mutual subtend of mode of the film F of clamping crystalline resin system betwixt dispose a pair of nozzle rows 21,21 that has a plurality of nozzles 20 respectively.Specifically, each nozzle rows 21 of subtend, with nozzle 20 be configured to the stagger arrangement shape (Japanese: the mode plover shape), carry out the subtend configuration at the length direction (moving direction) of the film F of crystalline resin system with staggering each other.
Each nozzle 20 is as shown in Figure 4, has a pair of slit 20a as the blow-off outlet of hot blast at its point with the axis of symmetry a that clips nozzle 20 and along the length direction mode separately of film F.In addition, each slit 20a extends and opening along the width (direction vertical with the paper of Fig. 4) of film F respectively.The stream 20b that each slit 20a is supplied with hot blast respectively with from the position of leaving axis of symmetry a to axis of symmetry a near mode crooked; The mode that meanwhile reaches slit 20a is formed; For each slit 20a; It tilts according to the mode near axis of symmetry a and discharges hot blast respectively, and these two bursts of gas interflow are mainly generally perpendicularly blown the film F that does not stretch and paid gas.In addition, axis of symmetry a is configured to vertical basically with film F.Here, as shown in Figure 4, with the vertical face of the length direction (direction vertical) of slit 20a with the paper of Fig. 4 in, will be made as slit width B with A/F from the slit 20a of the vertical direction of the gas flow direction of slit 20a ejection.In addition, though the diagram of omission is connected with the gas supply pipe of supplying with hot blast respectively at the upper reaches of stream 20b.
The longitudinal stretching operation that this embodiment is related to describes.The film F that does not stretch is at first by upstream side niproll 30A; After 30B clamps; Preferably through roller 31 conversion towards, the preheating zone 24 through stove 6, stretch zones 26, heat fixation zone 28 are in each zone; The hot blast (for example air etc.) that is used to from the slit 20a of a plurality of nozzles 20 heats, and meanwhile utilizes hot blast air supporting aloft.Then, the film F behind the longitudinal stretching that comes out from stove 6 preferably through roller 33 conversion towards after, by downstream niproll 32A, 32B clamps, and delivers to the back operation.At this moment, through making outlet side niproll 32A, the rotary speed of 32B is than entrance side niproll 30A, and the rotary speed of 30B is faster, can be along longitudinal direction to the film F stress application, and the longitudinal stretching of the film F that does not stretch after can heating thus.
(cross directional stretch operation)
In this embodiment, after above-mentioned longitudinal stretching operation, utilize the cross directional stretch operation of tentering method.The stove that in the cross directional stretch that utilizes the tentering method, uses, it is from pulling out the upstream side of the film F behind the longitudinal stretching, is provided with a plurality ofly can independently control the temperature of wind and the zone of wind speed.These zones for example can be made as upstream side the preheating zone, the downstream is made as stretch zones.Be provided with perforation nozzle as shown in Figure 5 38 in preheating zone and stretch zones.
As shown in Figure 5, be arranged at the perforation nozzle 38 of the top 100a of stove, its cross section have towards with longitudinal stretching after the shape gradually opened of the relative face 38a of film F be trapezoidal shape.Perforation nozzle 38 is that the face 38a of downside has a plurality of for example circular openings 44 at the face relative with film F.The blow-off outlet of the hot blast of perforation nozzle 38 is made up of a plurality of openings 44 that are arranged at face 38a.A plurality of openings 44 are the blow-off outlet of hot blast, and hot blast blows out from opening 44 with the wind speed of regulation.When disposing a plurality of opening 44 along the length direction of film F, also the broad ways configuration is a plurality of.Opening 44 for example can be configured to the shape that staggers.
(crystalline resin)
Crystalline resin is meant in X ray is resolved and demonstrates clear and definite crystalline resin, in more detail, is meant that the degree of crystallinity of obtaining through the wide-angle x-ray diffraction is the resin more than 10%.
In addition; As the crystalline resin that forms film F; Can enumerate out the homopolymers of alkene such as ethene, propylene, butylene, hexene for example or more than 2 kinds alkene copolymer and as the alkene more than a kind with can with this olefinic polymerization and for phenylethylene resin series, ethlyene dichlorides such as the polyolefin-based resins of the copolymer of the polymerizable monomer more than a kind of alkene, syndiotactic polytyrene are that ethylene fluorides such as resin, polyvinyl fluoride, Kynoar are resin, 6-nylon, 6, acid amides such as 6-nylon, 12-nylon be that saturated ester such as resin, PETG, polybutylene terephthalate (PBT) are resin, polyacetals, polyphenylene sulfide, organic siliconresin, TPU, polyether-ether-ketone, various thermoplastic elastomer (TPE) or these cross-linking agent etc.As the crystalline resin that has the degree of crystallinity more than 10% separately, can enumerate out the homopolymers of alkene such as ethene, propylene, butylene, hexene or more than two kinds alkene copolymer, as more than one alkene with can be with this olefinic polymerization and be not that saturated ester such as resin, PETG, polybutylene terephthalate (PBT) are resin, polyvinyl alcohol and modified resin thereof, polyphenylene sulfide, polyether-ether-ketone etc. for more than one the ethylene fluorides such as polyolefin-based resins, polyvinyl fluoride, Kynoar of copolymer of polymerizable monomer of alkene.Even the resin that does not separately have the degree of crystallinity more than 10% also can be through mixing with the above-mentioned crystalline resin that has the degree of crystallinity more than 10% separately with proper proportion, and be applicable to this embodiment.
The film that comprises crystalline resin, its recirculation property, solvent resistance are excellent, and in addition, even bioxin can not take place yet, do not make reason such as ecological deterioration from burning, as crystalline resin, special preferred polyolefm is a resin.
As polyolefin-based resins, can enumerate out propylene-ethylene copolymers, propylene-alpha-olefin copolymers, propylene-ethylene-alpha olefin copolymer etc.More specifically, as propylene-alpha-olefin copolymers, for example can enumerate propylene-butene-1 copolymer, propylene-1-pentene copolymer, propylene-1-hexene copolymer, propylene-1-octene copolymer etc.; As propylene-ethylene-alpha olefin copolymer, for example can enumerate propylene-ethylene-butene-1 copolymer, propylene-ethylene-1-hexene copolymer, propylene-ethylene-1-octene copolymer etc.As the propylene series copolymer among the present invention; Be preferably propylene-ethylene copolymers, propylene-butene-1 copolymer, propylene-1-pentene copolymer, propylene-1-hexene copolymer, propylene-1-octene copolymer, propylene-ethylene-butene-1 copolymer, propylene-ethylene-1-hexene copolymer, more preferably propylene-ethylene copolymers, propylene-butene-1 copolymer, propylene-1-hexene copolymer, propylene-ethylene-butene-1 copolymer, propylene-ethylene-1-hexene copolymer.
As the alpha-olefin that is used for propylene-alpha-olefin copolymers, propylene-ethylene-alpha-olefin terpolymer and ethene-alpha-olefin copolymer; Can enumerate out the alpha-olefin of carbon number 4～12; For example can enumerate out 1-butylene, 2-methyl isophthalic acid-propylene, 1-amylene, 2-methyl-1-butene alkene, 3-methyl-1-butene, 1-hexene, 2-ethyl-1-butylene, 2; 3-dimethyl-1-butylene, 2-Methyl-1-pentene, 3-Methyl-1-pentene, 4-methyl-1-pentene, 3,3-dimethyl-1-butylene, 1-heptene, methyl isophthalic acid-hexene, dimethyl-1-amylene, ethyl-1-amylene, trimethyl-1-butylene, Methylethyl-1-butylene, 1-octene, Methyl-1-pentene, ethyl-1-hexene, dimethyl-1-hexene, propyl group-1-heptene, Methylethyl-1-heptene, trimethyl-1-amylene, propyl group-1-amylene, diethyl-1-butylene, 1-nonene, 1-decene, 1-hendecene, 1-laurylene etc.Wherein preferred 1-butylene, 1-amylene, 1-hexene, 1-octene, from viewpoints such as copolymerized characteristic, economy, more preferably 1-butylene, 1-hexene.
Using under the situation of propylene-ethylene copolymers as polyolefin-based resins, the ethylene contents in this copolymer is generally 0.1～20 quality %, more preferably 0.5～10 quality %.Under the situation of using propylene-alpha-olefin copolymers, the content of the alpha-olefin in this copolymer is generally 0.1～40 quality %, is preferably 1～30 quality %.Under the situation of using propylene-ethylene-alpha-olefin terpolymer, the ethylene contents in this copolymer is generally 0.1～20 quality %, is preferably 0.5～10 quality %, and alpha-olefin content is generally 0.1～40 quality %, is preferably 1～30 quality %.Under the situation of using ethene-alpha-olefin copolymer, the content of the alpha-olefin in this copolymer is generally 0.1～30 quality %, is preferably 1～20 quality %.
As the polymerization of polyolefin-based resins, can enumerate out the solvent polymerization method that for example utilizes unreactive hydrocarbons solvent, use aqueous monomer as the mass polymerization of solvent, the gaseous polymerization of in gaseous monomer, carrying out etc.In addition; As obtain to contain the inherent viscosity method of the feedstock composition of different a plurality of polyolefin components each other through direct polymerization; Can enumerate out with batch (-type) and carry out the batch-type polymerization of polymerization, carry out the gas phase-gaseous polymerization, liquid phase-gaseous polymerization etc. of polymerization continuously; In the middle of these, from the viewpoint of productivity ratio, gas phase-gaseous polymerization, the liquid phase-gaseous polymerization of preferably carrying out polymerization continuously.
Said polyolefins is that resin can use the catalyst that is described below and obtains, and said catalyst for the catalyst that for example comprises the Ti-Mg series catalysts, this solid catalyst component and the organo-aluminum compound that make solid catalyst component that magnesium compound and compoundization of Ti compound form etc. and the sub-property of power supply as required compound grade in an imperial examination 3 compositions and combine is or the metallocene series catalysts.More particularly, can enumerate out the catalyst system of record in japanese kokai publication sho 61-218606 communique, japanese kokai publication sho 61-287904 communique, japanese kokai publication hei 7-216017 communique etc.
As required, in crystalline resin, can add various additives and filler.As this additive, but illustration goes out anti-oxidant, ultra-violet absorber, pigment, pigment etc.As filler, but illustration goes out organic fillers such as inorganic filler, resin micropowder etc.
As inorganic filler, can use metal oxides such as metal hydroxides such as metallic salts such as calcium carbonate, magnesium carbonate, brium carbonate, calcium sulfate, magnesium sulfate, barium sulfate, aluminium hydroxide, magnesium hydroxide, calcium oxide, magnesia, titanium oxide, aluminium oxide, zinc oxide, talcum, clay, kaolin, silica, hydrotalcite, diatomite, mica, zeolite, glass dust etc.
As organic filler, can use various resin particles.Preferably can enumerate out particles such as condensation resin such as homopolymers such as styrene, ketenes, acrylonitrile, methyl methacrylate, EMA, GMA, glycidyl acrylate, methyl acrylate or the copolymer more than 2 kinds, melamine, urea.
Under the situation of using polyolefin-based resins, can contain phenol is additives such as anti-oxidants such as anti-oxidant or phosphorous antioxidant, nertralizer, lubricant, antistatic additive, antiblocking agent.
The adding method of additive is not special to be limited, and for example can adopt following method: behind the powder and various additive of mixing arrangement hybrid junctions crystallinity resins such as use Henschel mixer, with the method for the direct granulationization of this mixture; Or after the additive masterbatch and the resin that use high mixing extruder contrast higher concentration such as double screw extruder carry out granulationization, the method that this particle and feedstock composition are mixed; Make the additive fusion and with aqueous methods such as method of adding in the feedstock composition.
As phenol is anti-oxidant, for example can enumerate out 2,6-di-t-butyl-4-cresols, four [methylene-3 (3 '; 5 '-di-t-butyl-4-hydroxyphenyl) propionic ester] methane, octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl) propionic ester, 3,9-two [2-{3-(3-tertiary butyl-4-hydroxy-5-aminomethyl phenyl) acryloxy }-1; The 1-dimethyl ethyl]-2,4,8; 10-four oxaspiros [55] hendecane, three (3; The 5-di-tert-butyl-4-hydroxyl benzyl) isocyanuric acid ester, triethylene glycol-N-two-3-(the 3-tert-butyl group-5-methyl-4-hydroxyphenyl) propionic ester, 1,6-hexylene glycol two [3-(3,5-di-t-butyl-4-hydroxyphenyl) propionic ester], 2; 2-thiobis-divinyl two [3-(3,5-di-t-butyl-4-hydroxyphenyl) propionic ester], vitamin E are the alpha-tocopherol class of representative etc.
As phosphorous antioxidant, for example can enumerate out three (nonyl phenyl) phosphite ester, three (2, the 4-di-tert-butyl-phenyl) phosphite ester, distearyl pentaerythrityl diphosphite, two (2, the 4-di-tert-butyl-phenyl) pentaerythritol diphosphites, two (2; 4-di-t-butyl-6-aminomethyl phenyl) pentaerythritol diphosphites, two (2,6-di-t-butyl-4-aminomethyl phenyl) pentaerythritol diphosphites, two (2, the 4-dicumylphenyl) pentaerythritol diphosphites, four (2; The 4-di-tert-butyl-phenyl)-4,4 '-diphenylene diphosphites, 2,2 '-di-2-ethylhexylphosphine oxide (4; The 6-di-tert-butyl-phenyl) 2-ethylhexyl phosphite ester, 2,2 '-ethylenebis (4, the 6-di-tert-butyl-phenyl) fluorophosphites, two (2; 4-di-t-butyl-6-aminomethyl phenyl) ethide phosphite ester, 2-(2,4,6-tri-tert phenyl)-5-ethyl-5-butyl-1; 3,2-oxygen phospha cyclohexane, 2,2 '; 2 "-nitrilo-[triethyl group-three (3,3 ', 5; 5 '-four-tert-butyl group-1,1 '-xenyl-2,2 '-two bases) phosphite ester etc.
As nertralizer, can enumerate out calcium stearate, dolomol, hydrotalcite, calcium hydroxide etc.
As lubricant, for example can enumerate out higher fatty acid amides, high-grade aliphatic ester.As antistatic additive, for example can enumerate out glyceride, Isosorbide Dinitrate, macrogol ester of the aliphatic acid of carbon number 8～22 etc.As antiblocking agent, for example can enumerate out silica, calcium carbonate, talcum etc.
(effect of this embodiment)
According to this embodiment; In the cooling curing operation; Guard shield 50 through having peristome 52 around molten sheet S the time through utilizing metallic elastic roller 14 and casting roll 16; 18 carry out conveyance and make its cooling curing, wherein above-mentioned molten sheet S moulding through the crystalline resin of extruding fusion from T die 12.Even receive the big molten sheet S that comprises crystalline resin of influence of the variation of environment, center on through utilizing guard shield 50, also can reduce the influence of environmental change and obtain the crystalline resin film of the excellent in uniformity of thickness, optical characteristics.In addition, guard shield 50 has peristome 52, so the temperature of T die 12 control also becomes easily, can obtain the crystalline resin film of the excellent in uniformity of thickness, optical characteristics.In addition, in this embodiment, owing to only be, thereby compare with the formation of use inert gas etc. and can process more low cost equipment with guard shield 50 formation around the molten sheet.
In addition; In this embodiment, in the cooling curing operation, guard shield 50 use tops have the guard shield at the peristome 52 of the direction opening of T die; Even thereby the big molten sheet S that comprises crystalline resin of thermograde; Through dispelling the heat from peristome 52, the temperature control of T die 12 also becomes easily, can obtain the crystalline resin film of the excellent in uniformity of thickness, optical characteristics.
In addition, in this embodiment, in the cooling curing operation, guard shield 50 is general to be the position that the temperature of cooling curing is promptly cooled off a T around molten sheet S until the molten sheet S that extrudes from T die 12.Therefore, cover until the position of the cooling point T of the influence that receives the operation apoplexy easily, can obtain the crystalline resin film of the excellent in uniformity of thickness, optical characteristics with guard shield 50.In addition, according to this embodiment, the part of influence that is not vulnerable to the variation of environment need not use guard shield 50 to cover, thereby can process low cost equipment simply.
In addition; In this embodiment; In the cooling curing operation; Guard shield 50 uses the guard shield with outside the place ahead shield 53a and outer proceeds posterolateral shield 53b, and the place ahead, wherein above-mentioned outside shield 53a and outer proceeds posterolateral shield 53b are used to make the rotation of following metallic elastic roller 14 and casting roll 16 and do not reach molten sheet S along the outer peripheral face generation of metallic elastic roller 14 and casting roll 16 with wake.Thus, can prevent to follow metallic elastic roller 14 and casting roll 16 rotation touch molten sheet S with wake, and can obtain the crystalline resin film of the excellent in uniformity of thickness, optical characteristics.
In addition, in this embodiment, in the cooling curing operation, guard shield 50 uses the guard shield of the side shield 51 with the side of extruding direction that covers molten sheet S.Thus, the influence of confusing that brings the air-flow of thin film fabrication environment to film F can be reduced, thereby the crystalline resin film of the excellent in uniformity of thickness, optical characteristics can be obtained.
In addition, in the cooling curing operation, the molten sheet S through cramping between two rollers of metallic elastic roller 14 and casting roll 16 has just been extruded from T die 12 makes its cooling curing in this embodiment.Through using metallic elastic roller 14 and casting roll 16 to carry out cooling curing, can improve the flatness of crystalline resin film of productivity ratio and the manufacturing of crystalline resin film.
In addition, in this embodiment, in the cooling curing operation, making the temperature of the outer peripheral face of the casting roll 16 in metallic elastic roller 14 and the casting roll 16 is below 30 ℃.Thus, before crystalline growth, the molten resin cooling curing of molten sheet S can be made, thereby the high crystalline resin film of the transparency can be made.
Further according to this embodiment, further stretch to make the film F that does not stretch behind the molten sheet S cooling curing through the cooling curing operation through stretching process.Thus, can make the crystalline resin films such as phase retardation film of the thickness that is drawn as regulation.
(other embodiments)
Below, describe for the 2nd embodiment of the present invention.As shown in Figure 6, it is different with above-mentioned the 1st embodiment not to be provided with metallic elastic roller 14 this point among the crystalline resin apparatus for manufacturing thin film 1b of this embodiment.In this embodiment; Owing to be not provided with metallic elastic roller 14; Cooling point T compares with above-mentioned the 1st embodiment and becomes the below more easily, and in the case, the place ahead, outside shield 53a of guard shield 50 and outer proceeds posterolateral shield 53b extend to more below than above-mentioned the 1st embodiment.In addition, in guard shield 50, the place ahead, outside shield 53a with outside the inboard of proceeds posterolateral shield 53b have a pair of inboard the place ahead shield 54a and the interior proceeds posterolateral shield 54b of each face of 2 faces of the molten sheet S that covering just extruded from T die 12.In this embodiment, outer proceeds posterolateral shield 53b and interior proceeds posterolateral shield 54b play and prevent to touch the effect of molten sheet S from the downstream of casting roll 16 with wake W.That is to say that outer proceeds posterolateral shield 53b and interior proceeds posterolateral shield 54b work with the wake shield as what put down in writing in claims.The outside the place ahead shield 53b and interior proceeds posterolateral shield 54b roughly become parallel mode with an end of each shield with the rotating shaft of casting rolls 16, closely are set up with casting rolls 16.
In this embodiment, in the cooling curing operation, the molten sheet S through utilizing 1 casting roll 16 conveyance just to extrude from T die 12 makes its cooling curing.Through utilizing 1 casting roll 16 to make molten sheet S cooling curing, the formation of device is become simple, and can reduce cost.
In addition; In this embodiment; Guard shield 50 uses the guard shield with inboard the place ahead shield 54a and interior proceeds posterolateral shield 54b, and wherein above-mentioned inboard the place ahead shield 54a and interior proceeds posterolateral shield 54b cover just each face of the molten sheet S that extrudes from T die 12.Through utilizing inboard the place ahead shield 54a and interior proceeds posterolateral shield 54b to cover just each face of the molten sheet S of the influence that is vulnerable to wind of extruding from T die 12, can obtain the crystalline resin film of the excellent in uniformity of thickness, optical characteristics.
In addition, as shown in Figure 6 in this embodiment, can the cooling on casting roll putting more, the downstream sets touch roll 19.As touch roll 19, preferably have elasticity, but as material illustration rubber.Do not limit as rubber hardness is special, can use rubber hardness (JIS A) to be the rubber below Hs90 ° more than Hs30 ° usually.Through setting touch roll, and, can reduce the dirt on the casting roll with casting roll 16 and touch roll 19 cramping film F.
In addition; Among the present invention; The crystalline resin apparatus for manufacturing thin film 1c that the 3rd embodiment of the present invention as shown in Figure 7 relates to can also extrude from T die 12 through making molten sheet S along continuous straight runs, and is utilized in the casting roll 16 of configuration up and down; 18 carry out conveyance, make molten sheet S carry out cooling curing.In the 3rd embodiment, outer proceeds posterolateral shield 53b and interior proceeds posterolateral shield 54b work with the wake shield as what put down in writing in claims.
Perhaps; Among the present invention; The crystalline resin apparatus for manufacturing thin film 1d that the 4th embodiment of the present invention as shown in Figure 8 relates to can also extrude from T die 12 towards the updrift side that tilts through making molten sheet S, and utilize the casting roll 16 of horizontal arrangement; 18 carry out conveyance, make molten sheet S carry out cooling curing.In the 4th embodiment, interior proceeds posterolateral shield 54b works with the wake shield as what put down in writing in claims.
[embodiment 1]
Below, describe for embodiments of the invention.In addition, each characteristic value shown in below is measured and is estimated according to following method.
(non-stretched film thickness)
Non-stretched film by gained; It is all to cut out film with 50mm wide (distance that flows to direction of film) abreast with respect to width; Using the thickness meter of Yama Co., Ltd.'s literary composition system is electrostatic capacity type TOF-C (trade name); Mensuration to the opposing party's end portion thickness, is estimated thickness with the mean value of the film thickness of length 1100mm part of the width of film central portion from a square end portion of the thin-film width direction that cut out.
(non-stretched film thickness and precision)
With the maximum of the thickness of length 1100mm part of the width of the non-stretched film central portion of measuring deduct minimum of a value and value estimate thickness and precision.
(phase difference in the non-stretched film face)
For the non-stretched film of gained, cut out at interval and with 40mm * 40mm with 100mm from mediad film end two directions of thin-film width direction.The film that is cut out is whole 14.The phasometer that uses prince's instrumentation machine Co., Ltd. system is the interior phase difference R0 of face that KOBRA-WPR (trade name) measures 14 the film that is cut out.
(non-stretched film phase difference uniformity)
With the maximum of phase difference R0 in the face of whole 14 films of measuring deduct minimum of a value and value, estimate the phase difference uniformity.
(T die central portion temperature)
Use is arranged at the thermocouple needle thermometric degree of the upstream side central portion of T die 12, starts extruder 10, after the temperature of setting extruder 10 and T die 12, to estimate the temperature of T die 12 through the temperature in the stage more than 2 hours.
(longitudinal stretching rear film thickness)
Except the mean value of the central portion that makes mensuration is the 600mm, to estimate thickness with the same method of non-stretched film thickness.
(longitudinal stretching rear film thickness and precision)
With the maximum of the thickness of the longitudinal stretching rear film of measuring deduct minimum of a value and value estimate thickness and precision.
(phase difference in the longitudinal stretching rear film face)
Except making the longitudinal stretching rear film that cuts out is whole 7, likewise measures with phase difference in the non-stretched film face.
(longitudinal stretching rear film phase difference uniformity)
With the maximum of phase difference R0 in whole 7 face of measuring deduct minimum of a value and value estimate.
(cross directional stretch rear film thickness)
Except obtaining the mean value, to estimate thickness with the same method of non-stretched film thickness by the thickness of length 700mm part.
(cross directional stretch rear film thickness and precision)
With the maximum of the thickness of the cross directional stretch rear film of measuring deduct minimum of a value and value estimate thickness and precision.
(phase difference in the cross directional stretch rear film face)
Except making the cross directional stretch rear film that cuts out is whole 7, likewise measures with phase difference in the non-stretched film face.
(cross directional stretch rear film phase difference uniformity)
With the maximum of phase difference R0 in the face of whole 7 films of measuring deduct minimum of a value and value estimate.
(embodiment 1)
Make film F through crystalline resin apparatus for manufacturing thin film 1a shown in Figure 1.Through the extruder 10 that is heated to 250 ℃ 75mm φ make polypropylene-based resin (propylene-ethylene random copolymer, ethylene contents=4 weight %, melt flow rate (MFR) (below; Be also referred to as MFR)=8.0g/10min, fusing point=134 ℃) melting mixing, by 12 pairs of metallic elastic rollers of T die 14 and casting roll 16 ejection molten sheet S.Near T die 12, be provided with guard shield 50 (guard shield A) with peristome 52.From all being set at 250 ℃ with extruder 10 joint to the T die 12 that is provided with that continues.Temperature at the ejiction opening 12a of T die 12 molten resin partly is 250 ℃.
Through when utilizing metallic elastic roller 14 and casting roll 16 with this molten sheet of length 5mm cramping S, utilize metallic elastic roller 14 and casting roll 16 to make its cooling curing, obtaining thickness is the film F of the polypropylene-based resin of 99 μ m.Before batching film F,, obtain the film F of wide 1350mm through the end that the otch operation is cut off film F.Metallic elastic roller 14 is set at 120 ℃, casting roll 16 and is set at 20 ℃.The result of the non-stretched film of gained is shown in table 1.
[table 1]
(embodiment 2)
Make film F through crystalline resin apparatus for manufacturing thin film 1b shown in Figure 6.Use the resin same, carry out melting mixing through the extruder 10 that is heated to 250 ℃ 75mm φ, from 12 pairs of casting rolls of T die, 16 ejection molten sheet S with embodiment 1.Near T die 12, be provided with guard shield 50 (guard shield B) with peristome 52.From likewise setting with the continue design temperature and the embodiment 1 of joint to the T die 12 that is provided with of extruder 10.Temperature at the ejiction opening 12a of T die 12 molten resin partly is 250 ℃.
Through utilizing casting roll 16 these molten resins of traction, making its cooling curing, obtaining thickness is the film F of the polypropylene-based resin of 100 μ m.Casting roll 16 is set at 15 ℃.Cooling point downstream on casting roll 16 is equipped with touch roll 19, after the film F with casting roll 16 and touch roll 19 cramping cooling curings, draws with casting roll 18.The result of the film F of the polypropylene-based resin of gained is shown in above-mentioned table 1.
The non-stretched film of cutting gained and be wide 1100mm after, it is dropped in two groups of niproll 30A, 30B and 32A have Fig. 3 and the large span longitudinal stretching machine 101 shown in Figure 4 of the stove 6 of air supporting mode between the 32B, carried out longitudinal stretching.Stove 6 is divided into 3 zones in preheating zone 24, stretch zones 26 and heat fixation zone 28.Each regional length is 2.6mm.Be provided with 6 pairs of nozzles 20 in each zone.Wind speed A from each slit 20a of nozzle 20 is 7.5m/s, and each slit width B of nozzle is 2 * 10
-3M, nozzle 20 up and down be spaced apart 70mm.In 1 nozzle 20, be provided with the slit 20a of two same slit widths.The condition of longitudinal stretching is following: each zone in preheating zone 24, stretch zones 26 and heat fixation zone 28 is set at 70 ℃, 90 ℃ and 110 ℃ respectively, and entrance velocity is 5m/min, and muzzle velocity is 9m/min, and stretching ratio is 1.8 times.The result of the film of gained is shown in table 2.
[table 2]
Further the film F that in longitudinal stretching, obtains has been carried out cross directional stretch through the tentering method.Be used to utilize the stove of the cross directional stretch of tentering method, it is from pulling out the upstream side of longitudinal stretching rear film, is provided with a plurality of chambers in the zone of the temperature that can independently control wind and wind speed, is 12m with the total length of the stove of the length addition of each chamber.In the zone of the temperature that can independently control wind and wind speed, use upstream side 6m as the preheating zone, use downstream 6m as stretch zones.In preheating zone and stretch zones, be provided with each 40 (20 pairs up and down) perforation nozzle 38 as shown in Figure 5.Speed at the wind of the ejiction opening of the perforation nozzle 38 of preheating zone and stretch zones is set at 6m/s and 5m/s respectively.In addition, the temperature of preheating zone and stretch zones is set at 140 ℃ and 130 ℃ respectively.The film F that cutting obtains in longitudinal stretching from cross directional stretch machine inlet input and implement 3.4 times cross directional stretch, obtains the film F of wide 1360mm with the mode of the wide 400mm except the chuck part of clamping film.Through cutting the film F of wide 1360mm, obtain the cross directional stretch film of wide 1000mm.The result of the film of gained is shown in table 3.
[table 3]
(comparative example 1)
Except using the guard shield (guard shield C) of the basic closed shown in above-mentioned patent documentation 1 near the T die 12, likewise make film F with embodiment 1.The result of the non-stretched film of gained is shown in above-mentioned table 1.
(comparative example 2)
Except not being provided with near the T die 12 guard shield 50, likewise make film F with embodiment 2.The result of the non-stretched film of gained is shown in above-mentioned table 1, and the result of the longitudinal stretching film of gained is shown in above-mentioned table 2, and the result of the cross directional stretch film of gained is shown in above-mentioned table 3.
Embodiment 2 and comparative example 2 that the contrast forming method is identical.As shown in table 1ly know that embodiment 2 compares with comparative example 2, thickness and precision and phase difference uniformity are very excellent.Can know since the influence of flowing etc. of near the atmosphere temperature the molten resin among the embodiment 2, small wind by homogenising, thereby thickness and precision and phase difference excellent in uniformity, further the actual temperature of T die 12 is also with respect to not change of design temperature.In addition, can know by table 2 and table 3, among the embodiment 2 behind the longitudinal stretching and, the thickness and precision behind the cross directional stretch and phase difference uniformity be also excellent.This demonstrates owing to improved the precision of non-stretched film, thereby has also improved the stretching uniformity.
In addition, the present invention is not limited to above-mentioned embodiment, in the scope that does not exceed purport of the present invention, can append various distortion certainly.
Claims (22)
1. crystalline resin film-forming method; It comprises the cooling curing operation that is described below, and the crystalline resin that is about to fusion is extruded and the molten sheet of moulding from the T die, when the guard shield that utilization has a peristome centers on; Utilize roller to carry out conveyance, make its cooling curing.
2. crystalline resin film-forming method according to claim 1 is characterized in that, in said cooling curing operation, said guard shield uses the guard shield that has said peristome in the direction of said T die.
3. crystalline resin film-forming method according to claim 1 and 2; It is characterized in that; In said cooling curing operation, said guard shield promptly cools off position a little around the temperature that said molten sheet is a cooling curing until the said molten sheet of extruding from said T die.
4. according to each described crystalline resin film-forming method in the claim 1～3; It is characterized in that; In said cooling curing operation; Said guard shield uses has the guard shield with the wake shield, saidly is used to make the rotation of following said roller and does not reach said molten sheet along what the outer peripheral face of said roller produced with wake with the wake shield.
5. according to each described crystalline resin film-forming method in the claim 1～4, it is characterized in that, in said cooling curing operation, said guard shield use have cover said molten sheet the guard shield of side shield of side.
6. according to each described crystalline resin film-forming method in the claim 1～5; It is characterized in that; In said cooling curing operation, the said molten sheet through after just extruding from said T die at cramping between two said rollers makes its cooling curing.
7. crystalline resin film-forming method according to claim 6 is characterized in that, in said cooling curing operation, the temperature that makes at least 1 outer peripheral face in two said rollers is below 30 ℃.
8. according to each described crystalline resin film-forming method in the claim 1～5; It is characterized in that; In said cooling curing operation,, make its cooling curing through utilizing the said molten sheet after 1 said roller conveyance has just been extruded from said T die.
9. according to each described crystalline resin film-forming method in claim 1～5 and the claim 8, it is characterized in that, utilize the film behind said roller and the rubber-like roller cramping cooling curing.
10. according to each described crystalline resin film-forming method in the claim 1～9; It is characterized in that; In said cooling curing operation; Said guard shield uses the guard shield with inboard shield, and said inboard shield covers just the one side at least of the said molten sheet of extruding from said T die.
11. according to each described crystalline resin film-forming method in the claim 1～10; It is characterized in that; It further comprises the stretching process that is described below, promptly to stretching through the crystalline resin film of said cooling curing operation after with said molten sheet cooling curing.
12. a crystalline resin apparatus for manufacturing thin film, it possesses:
Through the crystalline resin of extruding fusion make the molten sheet carry out moulding the T die,
The said molten sheet of extruding from said T die through conveyance makes the roller of its cooling curing, around said molten sheet of extruding from said T die and guard shield with peristome.
13. crystalline resin apparatus for manufacturing thin film according to claim 12 is characterized in that, said guard shield has the said peristome at the direction opening of said T die.
14., it is characterized in that said guard shield promptly cools off position a little around the temperature that said molten sheet is a cooling curing until the said molten sheet of extruding from said T die according to claim 12 or 13 described crystalline resin apparatus for manufacturing thin film.
15. according to each described crystalline resin apparatus for manufacturing thin film in the claim 12～14; It is characterized in that; Said guard shield has with the wake shield, saidly is used to make the rotation of following said roller and does not reach said molten sheet along what the outer peripheral face of said roller produced with wake with the wake shield.
16., it is characterized in that said guard shield has the side shield of the side that covers said molten sheet according to each described crystalline resin apparatus for manufacturing thin film in the claim 12～15.
17., it is characterized in that said roller makes its cooling curing through the said molten sheet after just extruding from said T die at cramping between two said rollers according to each described crystalline resin apparatus for manufacturing thin film in the claim 12～16.
18. crystalline resin apparatus for manufacturing thin film according to claim 17 is characterized in that, the temperature of at least 1 outer peripheral face in two said rollers is below 30 ℃.
19., it is characterized in that said roller makes its cooling curing through utilizing the said molten sheet after 1 said roller conveyance has just been extruded from said T die according to each described crystalline resin apparatus for manufacturing thin film in the claim 12～16.
20. according to each described crystalline resin apparatus for manufacturing thin film in claim 12～16 and the claim 19, it is characterized in that, utilize the film behind said roller and the rubber-like roller cramping cooling curing.
21. according to each described crystalline resin apparatus for manufacturing thin film in the claim 12～20, it is characterized in that said guard shield has inboard shield, said inboard shield covers just the one side at least of the said molten sheet of extruding from said T die.
22., it is characterized in that it further possesses the stretching device that the crystalline resin film behind the cooling curing by said roller is stretched according to each described crystalline resin apparatus for manufacturing thin film in the claim 12～21.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011094259 | 2011-04-20 | ||
| JP2011-094259 | 2011-04-20 |
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| Publication Number | Publication Date |
|---|---|
| CN102744851A true CN102744851A (en) | 2012-10-24 |
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|---|---|---|---|
| CN2012101131951A Pending CN102744851A (en) | 2011-04-20 | 2012-04-17 | Crystalline resin film manufacturing method and crystalline resin film manufacturing device |
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| Country | Link |
|---|---|
| JP (1) | JP2012232584A (en) |
| KR (1) | KR20130004059A (en) |
| CN (1) | CN102744851A (en) |
| TW (1) | TW201249969A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110181800A (en) * | 2019-06-28 | 2019-08-30 | 重庆瑞霆塑胶有限公司 | Tilting rack adjustment mechanism |
| CN114555334A (en) * | 2019-10-17 | 2022-05-27 | 东丽株式会社 | Blow-out nozzle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150000424A (en) * | 2013-06-24 | 2015-01-02 | 스미또모 가가꾸 가부시끼가이샤 | Method for producing thermoplastic resin film |
| KR102269435B1 (en) * | 2014-07-17 | 2021-06-24 | 헨켈 아게 운트 코. 카게아아 | Photo-curable liquid optically clear adhesive composition and use thereof |
| KR101716341B1 (en) * | 2015-02-04 | 2017-03-14 | 도레이 배터리 세퍼레이터 필름 주식회사 | Device and method for producing microporous polyolefin resin sheet |
| WO2016129400A1 (en) | 2015-02-13 | 2016-08-18 | 三井化学株式会社 | Piezoelectric polymer film and method for producing same |
| JP6789864B2 (en) * | 2017-03-24 | 2020-11-25 | 芝浦機械株式会社 | Sheet / film forming roll device, sheet / film manufacturing device, and sheet / film manufacturing method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101450515A (en) * | 2007-12-05 | 2009-06-10 | 富士胶片株式会社 | Apparatus for manufacturing thermoplastic resin film, and method for manufacturing thermoplastic resin film |
-
2012
- 2012-04-17 CN CN2012101131951A patent/CN102744851A/en active Pending
- 2012-04-18 TW TW101113772A patent/TW201249969A/en unknown
- 2012-04-18 KR KR1020120040309A patent/KR20130004059A/en not_active Application Discontinuation
- 2012-04-19 JP JP2012095587A patent/JP2012232584A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101450515A (en) * | 2007-12-05 | 2009-06-10 | 富士胶片株式会社 | Apparatus for manufacturing thermoplastic resin film, and method for manufacturing thermoplastic resin film |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110181800A (en) * | 2019-06-28 | 2019-08-30 | 重庆瑞霆塑胶有限公司 | Tilting rack adjustment mechanism |
| CN110181800B (en) * | 2019-06-28 | 2021-05-28 | 重庆瑞霆塑胶有限公司 | Tilting frame adjusting mechanism |
| CN114555334A (en) * | 2019-10-17 | 2022-05-27 | 东丽株式会社 | Blow-out nozzle |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2012232584A (en) | 2012-11-29 |
| TW201249969A (en) | 2012-12-16 |
| KR20130004059A (en) | 2013-01-09 |
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