WO2015129493A1 - Procédé de fabrication de film étiré - Google Patents

Procédé de fabrication de film étiré Download PDF

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Publication number
WO2015129493A1
WO2015129493A1 PCT/JP2015/054064 JP2015054064W WO2015129493A1 WO 2015129493 A1 WO2015129493 A1 WO 2015129493A1 JP 2015054064 W JP2015054064 W JP 2015054064W WO 2015129493 A1 WO2015129493 A1 WO 2015129493A1
Authority
WO
WIPO (PCT)
Prior art keywords
film
stretched film
roll
width direction
stretching
Prior art date
Application number
PCT/JP2015/054064
Other languages
English (en)
Japanese (ja)
Inventor
幸司 住田
佳照 石上
白石　貴志
Original Assignee
住友化学株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Priority to CN201580009789.XA priority Critical patent/CN106029340A/zh
Priority to KR1020167023181A priority patent/KR102098444B1/ko
Publication of WO2015129493A1 publication Critical patent/WO2015129493A1/fr

Links

Classifications

    • 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
    • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
    • B29C55/08—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique transverse to the direction of feed
    • 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
    • B29C55/20—Edge clamps

Definitions

  • the present invention relates to a method for producing a stretched film, and more particularly, to a method for producing a stretched film that has been slit by slitting both ends in the width direction after stretching in the film width direction (lateral stretching).
  • an image display device such as a liquid crystal display device
  • various optical films made of a thermoplastic resin such as a polarizer, a protective film for a polarizer, an optical compensation film (such as a retardation film), an antiglare film, and an antireflection film.
  • a thermoplastic resin such as a polarizer, a protective film for a polarizer, an optical compensation film (such as a retardation film), an antiglare film, and an antireflection film.
  • Some of these optical films have been subjected to stretching treatment (lateral stretching) in the film width direction in order to increase the toughness of the film or to impart desired optical properties, for example.
  • the film is generally stretched laterally by holding both ends in the film width direction with clips and supplying them to a tenter or the like. Both ends in the width direction of the laterally stretched film are usually slits to remove the unstretched portion because it was held by a clip during stretching, or to adjust the film width to a desired size. (Trimming) and removed to obtain an optical film [for example, Japanese Patent Application Laid-Open No. 2006-272616 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2010-036414 (Patent Document 2)].
  • the present invention provides a method for producing a stretched film shown below.
  • thermoplastic resin constituting the thermoplastic resin film is a (meth) acrylic resin or a polystyrene resin.
  • a long slit processed stretched film having a uniform width can be continuously produced.
  • thermoplastic resin film is a long film.
  • a long film refers to a film having a length in the film transport direction of 100 m or more.
  • the thermoplastic resin film is continuously drawn from, for example, a feeding device and continuously conveyed along a conveyance path constructed by a guide roll, a drive roll, etc., and a stretching treatment zone in which a stretching device is arranged. A stretching process is performed at.
  • thermoplastic resin which comprises a thermoplastic resin film
  • thermoplastic resin film is preferably a light-transmitting (preferably optically transparent) thermoplastic resin film.
  • thermoplastic resins include chain polyolefin resins, cyclic polyolefin resins (such as norbornene resins), polyolefin resins such as polyethylene resins and polypropylene resins; polyester resins such as polyethylene terephthalate; methacrylic acid (Meth) acrylic resins such as methyl resins; cellulose resins such as cellulose triacetate and cellulose diacetate; polycarbonate resins; polyvinyl alcohol resins; polyvinyl acetate resins; polyarylate resins; Polyether sulfone resin; Polysulfone resin; Polyamide resin; Polyimide resin; and mixtures and copolymers thereof.
  • (meth) acryl means at least one selected from acrylic and methacrylic.
  • thermoplastic resin film is made of a (meth) acrylic resin or polystyrene resin
  • the toughness of the portion gripped by the clip is low, and this portion on the guide roll becomes difficult when a high transport tension is applied to the film. Since it is easy to break, it is difficult to carry the film immediately after stretching at high tension. Therefore, wrinkles are easily generated in the film immediately after stretching, and the merit of applying the method of the present invention is great.
  • the thickness of the thermoplastic resin film is, for example, about 30 to 400 ⁇ m, and preferably 50 to 200 ⁇ m.
  • a tenter method can be used as a method of gripping both ends in the width direction with a clip and extending at least in the width direction.
  • the tenter method is a method in which both ends in the film width direction are fixed with clips (chucks) and stretched in an oven while widening the interval between the clips in the lateral direction.
  • the stretching treatment in this step is not limited to transverse stretching, but may be simultaneous biaxial stretching in which stretching or shrinking is performed simultaneously in the longitudinal direction (film length direction). Simultaneous biaxial stretching can be performed by expanding and contracting in the longitudinal direction while expanding the clip interval in the lateral direction in the tenter method.
  • a stretching machine (tenter stretching machine) used for the tenter method usually has a zone for performing a preheating step, a zone for performing a stretching step, and a zone for performing a heat setting step, and a mechanism capable of independently adjusting the temperature of each zone. It has.
  • the preheating step is a step that is provided before the step of stretching the thermoplastic resin film, and is a step of heating to a temperature sufficient to stretch the thermoplastic resin film.
  • the preheating temperature in the preheating step can be about T-10 ° C. to T + 50 ° C., where T is the phase transition temperature (glass transition temperature or melting point) of the resin constituting the thermoplastic resin film.
  • the stretching step is a step of stretching the thermoplastic resin film at least in the width direction.
  • the stretching temperature in the stretching step can be about T-10 ° C. to T + 50 ° C.
  • the draw ratio in the width direction is, for example, 1.2 to 4 times, and preferably 1.5 to 3 times. The greater the draw ratio, the greater the difference in thickness between the part where the film is gripped and the part where the film is not gripped, and wrinkles tend to occur in the above-mentioned places, but according to the present invention, the stretch ratio is 1. Even if it is 5 times or more, and even 2 times or more, a slit processed stretched film having a uniform width can be obtained.
  • the length means the film width in the case of transverse stretching.
  • the heat setting step is a step in which the film is passed through a zone of a predetermined temperature in the oven while maintaining the film width at the end of the stretching step.
  • the film may be passed through a predetermined temperature zone in the oven while narrowing the film width from the end of the stretching step.
  • the shrinkage width of the film in the heat setting step can be, for example, 15% or less, more preferably 5% or less.
  • the heat setting temperature can be the same as or lower than the stretching temperature.
  • the thickness of the stretched film obtained in this step is, for example, about 5 to 200 ⁇ m, preferably 10 to 150 ⁇ m, more preferably 20 to 100 ⁇ m, as the thickness at the center in the width direction.
  • the thickness of the stretched portion is smaller.
  • the thickness of the central portion in the width direction is 100 ⁇ m or less, and even 80 ⁇ m or less, it is uniform.
  • a slit processed stretched film having a width can be obtained.
  • the obtained stretched film is released from the clip, and preferably slits and removes both ends in the width direction while continuously transporting along the transport path.
  • a shear cutter can be suitably used for the slit.
  • the method of the present invention performs slit processing twice (this step and a third step described later) to obtain a slit processed stretched film having a desired width, so both ends to be slit in this step
  • the width (slit width) is such a width that the stretched film after slit processing does not reach the desired width, but at least the portion where the thickness remains larger than the stretched portion, that is, at least Both ends in the width direction held by the clip are slit in this step.
  • the slit ends generated by continuously slitting both ends of the long stretched film may be sequentially wound using a winding device.
  • the slit width is preferably 30 mm or more and 300 mm or less per one end portion, and is preferably 35 mm or more and 200 mm or less per one end portion. More preferred.
  • the slit widths at both ends in this step are The film width after slitting is adjusted to be preferably 60 mm to 600 mm, more preferably 70 mm to 400 mm wider than the final desired film width (film width after the second slit processing).
  • the conveyance speed of the stretched film at the time of slit processing is preferably 2 to 20 m / min, and more preferably 3 to 15 m / min in order to keep the slit width as constant as possible.
  • the film conveyance speed is preferably as constant as possible during the slit processing, and the variation in the conveyance speed during the slit processing is preferably within a range of ⁇ 1%.
  • the transport speed of the stretched film can be measured with a tachometer or a laser Doppler non-contact tachometer through a rotary encoder.
  • the tension applied to the stretched film at the time of slitting is preferably 5 N / m to 200 N / m, more preferably 30 N / m to 120 N / m in order to keep the slit width as constant as possible. .
  • the tension is preferably as constant as possible during slit processing, and more preferably within a range of ⁇ 5%.
  • the tension can be measured by a method of detecting with a load cell attached to the tension pickup roll, a method of calculating the tension from the displacement of the roll, or the like.
  • a driving roll is installed on the downstream side of the slitting process.
  • a dancer roll may be disposed in the vicinity of the drive roll, and the tension may be adjusted by applying pressure to the film via the dancer roll.
  • the slit stretched film passes through a drive roll disposed on the downstream side of the slit process in the transport path.
  • the stretched film after the slit processing is more likely to wrinkle during conveyance as the stretched portion has a smaller thickness, but the wrinkle can be eliminated by applying the above tension using a drive roll,
  • a slit processed stretched film having a uniform width can be obtained by the subsequent third step.
  • a plurality of drive rolls may be installed between the slit process in the second step and a third slit process to be described later.
  • a driving roll having a large film holding angle can be used alone to control the tension of the film upstream and / or downstream of the driving roll.
  • driving roll is a bonding roll.
  • the bonding roll is also composed of a pair of rotatable rolls like the nip roll, but the film is formed by passing a plurality of films (for example, with an adhesive interposed) between the pair of rolls and pressing from above and below. Used for pasting.
  • a drive roll can be used for at least one of the bonding rolls formed of such a pair of rolls.
  • the rotation of the laminating roll can also be a driving force for film conveyance, and the film conveyance speed and the tension applied to the film can be controlled by adjusting the rotation speed.
  • a suction roll capable of rotation control can be used as the drive roll.
  • the suction roll has a large number of suction holes formed on the outer peripheral surface, and is a rotatable roll capable of adsorbing a film that contacts the outer peripheral surface by sucking air from the suction holes.
  • suction rolls support only one side of the passing film, but the above-mentioned adsorption prevents slipping between the film and the roll, so it absorbs the rotational driving force of the roll.
  • the film can be conveyed while applying tension to the film.
  • guide rolls also referred to as free rolls
  • guide rolls which simply support the traveling film and do not give tension to the driving force for transporting the film or the film, are not included in the driving roll. Even if the guide roll is passed after the slitting process, it is difficult to eliminate wrinkles, and the film width varies in the slit process in the subsequent third process.
  • This step is a step of further slitting and removing both ends in the width direction of the stretched film after passing through the drive roll, preferably while continuously transporting along the transport path.
  • a slit processed stretched film having a desired width is obtained.
  • a shear cutter can be suitably used for the slit.
  • the wrinkles are eliminated due to pressing or suction by the drive roll or further tension on the film applied by the drive roll. Therefore, a long slit stretched film having a uniform width can be continuously produced.
  • slitting is preferably performed while tension is applied to the stretched film during slit processing (after passing through the drive roll).
  • tension is applied by, for example, the drive roll and the winding device. More specifically, it can be applied by a nip roll including a driving roll and the winding device. It is also possible to control the tension between the nip roll including the drive roll and the winding device by controlling the torque of the powder clutch disposed in the winding device.
  • the present invention is not limited thereto, and another drive roll is provided on the downstream side of the drive roll and upstream of the winding device, tension is applied by these drive rolls, and slit processing is performed between these drive rolls. You may make it perform.
  • the tension applied to the stretched film at the time of slitting is preferably 5 N / m to 120 N / m, and preferably 30 N / m to 100 N in order to keep the slit width as constant as possible and obtain a stretched film with as uniform a width as possible. / M is more preferable. For the same reason, the tension is preferably as constant as possible during slitting.
  • the transport speed of the stretched film during slit processing is preferably 3 to 20 m / min, in order to keep the slit width as constant as possible and obtain a stretched film with a uniform width as much as possible. It is more preferable.
  • the film conveyance speed is preferably as constant as possible during the slit processing, and the variation in the conveyance speed during the slit processing is preferably within a range of ⁇ 1%.
  • the film conveyance speed and tension at the time of slit processing can be easily controlled by the rotation speed of the drive roll or the winding device.
  • An accumulator may be installed on the upstream side of the winding device in the transport path.
  • the accumulator is a device for temporarily stopping the film conveyance on the downstream side by accumulating the conveyed film.
  • the slit processing in this step is performed on the upstream side of the accumulator.
  • the thermoplastic resin film used in the first step may be subjected to a longitudinal stretching treatment in the film length direction prior to the first step.
  • the longitudinal stretching process includes stretching between rolls in which longitudinal stretching is performed by a difference in peripheral speed between the two nip rolls while passing through an oven between two nip rolls installed at a distance, and heat whose surface is heated.
  • a preheating step and a heat setting step can be provided in the same manner as the transverse stretching process.
  • the draw ratio of the longitudinal drawing is not particularly limited, and is, for example, 1.2 to 4 times, preferably 1.5 to 3 times.
  • [B] Winding step As described above, it is usually obtained when a slit processed stretched film is produced by sequentially carrying out the first to third steps while continuously conveying a long thermoplastic resin film.
  • the slit processed stretched film is sequentially wound by a winding device to form a film roll. Since the obtained film roll has a uniform film width over the length direction, the end faces are uniform and the appearance is excellent.
  • the masking film is also called a protective film or a surface protective film, and is a film for protecting the surface of the stretched film.
  • the masking film is usually configured by providing an adhesive layer on one side of a film made of a thermoplastic resin. A masking film is bonded to the surface of the stretched film through this adhesive layer.
  • the thermoplastic resin can be, for example, a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, a polyester resin such as polyethylene terephthalate or polyethylene naphthalate, and the like.
  • Bonding of the masking film can reduce wrinkles during conveyance by increasing the thickness by bonding the masking film to the stretched film or by applying high tension to the stretched film. For this reason, it is preferable to carry out the process upstream of the slit in the third step. In this case, in order to bond a masking film, it is possible to use at least one of the bonding rolls as the drive roll.
  • Example 1 Pellets of methyl methacrylate / methyl acrylate (weight ratio 94/6) having a glass transition temperature Tg of 108 ° C. were put into an extruder and extruded from a T-die having a set temperature of 270 ° C. Both sides of the extruded film-like molten resin were sandwiched and cooled by a pair of polishing rolls set at a temperature of 110 ° C. to obtain a long unstretched film having a thickness of 120 ⁇ m and a width of 1000 mm as a film roll.
  • the unstretched film is continuously fed from the film roll while being conveyed, and a preheating zone (preheating temperature: 110 ° C.), a stretching zone (stretching between rolls, stretching temperature: 120 ° C.), a heat setting zone (heat fixing temperature: 120). C.) was passed in order to obtain a long longitudinally stretched film having a thickness (thickness in the center in the width direction) of 93 ⁇ m and a width of 720 mm as a film roll. The draw ratio of this longitudinal drawing was 1.8 times.
  • a longitudinally stretched film is continuously fed from a film roll, and a preheating zone (preheating temperature: 120 ° C.), a stretching zone (stretching temperature: 120 ° C.), and a heat setting zone (heat setting temperature: 120 ° C.) are provided.
  • the film was sequentially passed to obtain a continuous biaxially stretched film having a thickness (thickness at the center in the width direction) of 45 ⁇ m and a width of 1400 mm.
  • the lateral stretching in the stretching zone was performed by holding a 20 mm portion from both ends in the width direction of the film with a clip and supplying it to a tenter stretching machine to widen the clip interval in the lateral direction.
  • the draw ratio of this transverse drawing was 2.0 times.
  • both ends of the film were slit using a shear cutter with a width of 50 mm, respectively, and the film width was trimmed to 1300 mm.
  • the film conveyance speed and tension during slit processing were 3 m / min and 80 N / m, respectively.
  • the successively biaxially stretched film after slit processing is continuously conveyed and passed through a nip roll (one roll is a drive roll. The same applies to Example 2), and then both ends of the film are passed through.
  • a nip roll one roll is a drive roll.
  • Example 2 The same applies to Example 2
  • Each film was slit using a shear cutter with a width of 150 mm, the film width was trimmed to 1000 mm, and wound up with a winder to obtain a film roll.
  • the conveyance speed and tension of the film during slit processing were 3 m / min and 100 N / m, respectively.
  • Tetech is a self-adhesive protective film when the biaxially stretched film is passed through the nip roll sequentially after the first slitting process and then the biaxially stretched film is passed through the laminating roll before the second slitting process.
  • a film roll made of a sequential biaxially stretched film with a masking film was obtained in the same manner as in Example 1 except that (Toray Film Processing Co., Ltd.) was passed through the sequentially biaxially stretched film. When the end surface of the obtained film roll was observed, it was flat without any particularly protruding portion, and the entire end surface was evenly aligned within a range of about ⁇ 0.5 mm.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

La présente invention concerne un procédé de fabrication de film étiré comprenant : une première étape consistant à obtenir un film étiré par saisie des deux bords d'un film de résine thermoplastique dans la direction de la largeur au moyen de pinces et par étirement au moins dans la direction de la largeur ; une deuxième étape consistant, après découpage des deux bords dans la direction de la largeur, à faire passer le film étiré au-delà d'un rouleau d'entraînement ; et une troisième étape consistant à découper davantage les deux bords du film étiré dans la direction de la largeur après passage par le rouleau d'entraînement.
PCT/JP2015/054064 2014-02-26 2015-02-16 Procédé de fabrication de film étiré WO2015129493A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201580009789.XA CN106029340A (zh) 2014-02-26 2015-02-16 拉伸膜的制造方法
KR1020167023181A KR102098444B1 (ko) 2014-02-26 2015-02-16 연신 필름의 제조 방법

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014035441A JP6328956B2 (ja) 2014-02-26 2014-02-26 延伸フィルムの製造方法
JP2014-035441 2014-02-26

Publications (1)

Publication Number Publication Date
WO2015129493A1 true WO2015129493A1 (fr) 2015-09-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2015/054064 WO2015129493A1 (fr) 2014-02-26 2015-02-16 Procédé de fabrication de film étiré

Country Status (5)

Country Link
JP (1) JP6328956B2 (fr)
KR (1) KR102098444B1 (fr)
CN (2) CN109719929A (fr)
TW (1) TWI651186B (fr)
WO (1) WO2015129493A1 (fr)

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JPS58160122A (ja) * 1982-03-19 1983-09-22 Teijin Ltd 物性の均一なフイルムの製造法
JP2010036414A (ja) * 2008-08-04 2010-02-18 Nippon Shokubai Co Ltd 光学延伸フィルムの製造方法
JP2011131509A (ja) * 2009-12-25 2011-07-07 Nippon Shokubai Co Ltd 光学フィルムの製造方法
JP2012131208A (ja) * 2010-12-24 2012-07-12 Nippon Zeon Co Ltd フィルム耳の切取回収装置、長尺の光学フィルムの製造方法、及びフィルム耳の巻回体の製造方法
JP5339017B1 (ja) * 2012-11-06 2013-11-13 コニカミノルタ株式会社 長尺延伸フィルムの製造方法

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JP2598293B2 (ja) * 1988-03-09 1997-04-09 三菱化学株式会社 一軸延伸フイルムの製造法
JP3693423B2 (ja) * 1996-07-17 2005-09-07 旭化成ケミカルズ株式会社 共重合体ラテックス
CN100454053C (zh) * 2004-04-19 2009-01-21 柯尼卡美能达精密光学株式会社 卷筒状相位差膜的制造方法、相位差膜、偏振片及显示装置
JP2006272616A (ja) * 2005-03-28 2006-10-12 Konica Minolta Opto Inc 光学フィルム、及びその製造装置
JP4236681B2 (ja) * 2006-12-15 2009-03-11 東洋鋼鈑株式会社 延伸フィルムの製造方法
JP2009078487A (ja) * 2007-09-27 2009-04-16 Fujifilm Corp フイルムの延伸方法及び延伸装置、溶液製膜方法
US8524536B2 (en) * 2008-08-19 2013-09-03 Nitto Denko Corporation Optical film cutting method and apparatus using the same
WO2012114820A1 (fr) * 2011-02-21 2012-08-30 コニカミノルタオプト株式会社 Procédé et de production et film et appareil de production de film
MY166819A (en) 2011-03-29 2018-07-23 Toray Industries Tenter oven and manufacturing method for stretched film
US9039860B2 (en) * 2012-01-30 2015-05-26 Sumitomo Chemical Company, Limited Method of manufacturing polarizing plate
JP5912860B2 (ja) * 2012-05-25 2016-04-27 株式会社日本触媒 延伸樹脂フィルムの製造方法
CN203063012U (zh) * 2013-02-06 2013-07-17 厦门顺峰包装材料有限公司 塑料薄膜边料在线回收装置

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Publication number Priority date Publication date Assignee Title
JPS58160122A (ja) * 1982-03-19 1983-09-22 Teijin Ltd 物性の均一なフイルムの製造法
JP2010036414A (ja) * 2008-08-04 2010-02-18 Nippon Shokubai Co Ltd 光学延伸フィルムの製造方法
JP2011131509A (ja) * 2009-12-25 2011-07-07 Nippon Shokubai Co Ltd 光学フィルムの製造方法
JP2012131208A (ja) * 2010-12-24 2012-07-12 Nippon Zeon Co Ltd フィルム耳の切取回収装置、長尺の光学フィルムの製造方法、及びフィルム耳の巻回体の製造方法
JP5339017B1 (ja) * 2012-11-06 2013-11-13 コニカミノルタ株式会社 長尺延伸フィルムの製造方法

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TWI651186B (zh) 2019-02-21
TW201542340A (zh) 2015-11-16
KR20160125396A (ko) 2016-10-31
CN109719929A (zh) 2019-05-07
CN106029340A (zh) 2016-10-12
KR102098444B1 (ko) 2020-04-07
JP2015160328A (ja) 2015-09-07
JP6328956B2 (ja) 2018-05-23

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