WO2015108036A1 - Procédé de production d'un film étiré - Google Patents

Procédé de production d'un film étiré Download PDF

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Publication number
WO2015108036A1
WO2015108036A1 PCT/JP2015/050670 JP2015050670W WO2015108036A1 WO 2015108036 A1 WO2015108036 A1 WO 2015108036A1 JP 2015050670 W JP2015050670 W JP 2015050670W WO 2015108036 A1 WO2015108036 A1 WO 2015108036A1
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WO
WIPO (PCT)
Prior art keywords
film
stretching
thermoplastic resin
stretched
thickness
Prior art date
Application number
PCT/JP2015/050670
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English (en)
Japanese (ja)
Inventor
弘志 稲澤
邦博 清家
山本　省吾
かおり 平郡
健一 藤澤
Original Assignee
東洋鋼鈑株式会社
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
Priority claimed from JP2014006469A external-priority patent/JP6377355B2/ja
Priority claimed from JP2014006470A external-priority patent/JP6338865B2/ja
Application filed by 東洋鋼鈑株式会社 filed Critical 東洋鋼鈑株式会社
Priority to KR1020167021806A priority Critical patent/KR102181046B1/ko
Priority to CN201580004804.1A priority patent/CN105916654B/zh
Publication of WO2015108036A1 publication Critical patent/WO2015108036A1/fr

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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
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
    • B29C55/16—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial simultaneously
    • 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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0011—Combinations of extrusion moulding with other shaping operations combined with compression moulding
    • 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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • 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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
    • 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
    • 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
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/19—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their edges
    • 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
    • B29C48/30—Extrusion nozzles or dies
    • 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
    • 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
    • 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
    • B29C48/915—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means
    • B29C48/9155—Pressure rollers
    • 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
    • B29C48/92—Measuring, controlling or regulating
    • 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
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
    • B29C55/14—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively
    • 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
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/78—Measuring, controlling or regulating

Definitions

  • the present invention relates to a method for producing a stretched film.
  • a method of preparing a film as a material and stretching the prepared film is used.
  • the film is held in a heating furnace while holding both ends of the film with clips.
  • a simultaneous biaxial stretching method in which heating and stretching are simultaneously performed in the length direction and the width direction by clips that are conveyed and gripped at both ends of the film in a heating furnace.
  • the film is stretched by heating to the necessary stretching ratio by pulling the film in the length direction and the width direction.
  • a large stress is applied to both ends of the film, which is the part gripped by the clip, resulting in tears at both ends of the film and where the thickness of the film is thin. It may break.
  • the film for heat stretching is formed by melt extrusion of a thermoplastic resin with a molding die, so that the thickness of a part of the film is reduced during melt extrusion. Therefore, there is a problem that the thinned portion is torn when the heat stretching is performed and the entire film is broken.
  • neck-in that extends in the length direction and narrows the film width after being melt-extruded and taken up by a cooling roll or the like.
  • the phenomenon occurs.
  • Such neck-in is considered to occur as follows. That is, the thermoplastic resin melt-extruded from the molding die has a thermoplastic resin adjacent to each other at the center in the width direction of the film, so that the flow direction of the thermoplastic resin is limited, Plane extension is performed along a predetermined surface inside the thermoplastic resin, whereby shrinkage in the width direction is suppressed, and shrinkage is mainly performed in the thickness direction.
  • the thermoplastic resin melt-extruded from the forming die has no thermoplastic resin adjacent to the outer side surface at the portion that becomes both ends in the width direction of the film, so that the thermoplastic resin flows freely. Then, it extends uniaxially around a predetermined axis inside the thermoplastic resin, and thereby contracts in the width direction in addition to the thickness direction. Therefore, in the formed film, the boundary part between the width direction center part and the width direction both ends will be dented in the thickness direction by the difference in the shrinkage
  • the present invention has been made in view of such a situation, and in producing a stretched film by heating and stretching the film, it is possible to prevent the film from being broken, and to provide a stretched film excellent in productivity and quality. It aims at providing the manufacturing method of the stretched film which can be obtained.
  • the present inventors can The inventors have found that the object can be achieved and have completed the present invention.
  • thermoplastic resin melt-extruded from a molding die
  • it is cooled by a roll and solidified to form a pre-stretch film forming step, and the pre-stretch film forming step.
  • a minimum thickness of the boundary portion formed between said central portion and the both end portions and t b, the average thickness of the central portion in the case of the t c, the minimized thickness t b of the boundary There is provided a method for producing a stretched film, wherein the pre-stretch film is formed so that the ratio “t b / t c ” to the average thickness t c of the central portion is 0.75 or more. .
  • an acrylic resin is preferably used as the thermoplastic resin.
  • the thermoplastic resin a first thermoplastic resin that forms an inner region located on the inner side in the width direction of the film before stretching, and an outer region located on the outer side in the width direction of the film before stretching. It is preferable to use a second thermoplastic resin different from the first thermoplastic resin.
  • an acrylic resin is preferably used as the first thermoplastic resin.
  • thermoplastic resin having a glass transition temperature difference of 10 ° C. or less as the first thermoplastic resin and the second thermoplastic resin.
  • the maximum thickness of the end portions in the case of a t e, the ratio "t e / t c" between the maximum thickness t e of the end portions and the average thickness t c of the central portion It is preferable to form the pre-stretch film in the pre-stretch film forming step so as to be in the range of 1.0 to 2.0.
  • the pre-stretch film in the pre-stretch film forming step so that “/ t c ” is 8.0 or less.
  • the heat stretching of the pre-stretched film in the stretching step is performed by simultaneous biaxial stretching that simultaneously stretches in the length direction and the width direction of the pre-stretched film.
  • stretching in the said extending process shall be 3 times or less.
  • the heat stretching of the pre-stretched film in the stretching step is performed so that the thickness of the central portion of the stretched film after the heat stretching is in the range of 15 to 50 ⁇ m.
  • the manufacturing method of this invention performs the smoothing in the said smoothing process by removing the area
  • a stretched film production method capable of appropriately performing heat-stretching and obtaining a stretched film excellent in productivity and quality is provided. Can be provided.
  • FIG. 1 is a diagram for explaining a method of producing a pre-stretch film.
  • FIG. 2 is a view for explaining neck-in of a melt-extruded thermoplastic resin.
  • FIG. 3 is a view for explaining shrinkage of the melt-extruded thermoplastic resin.
  • FIG. 4 is a diagram illustrating an example of the thickness of the unstretched film with respect to the position in the width direction.
  • FIG. 5 is a diagram for explaining a method of stretching a pre-stretched film by a simultaneous biaxial stretching method in a stretching step.
  • FIG. 6 is a graph showing the results of measuring the thickness of the pre-stretched film and stretched film produced in Examples and Comparative Examples with respect to the width direction position.
  • FIG. 1 is a diagram for explaining a method of producing a pre-stretch film.
  • FIG. 2 is a view for explaining neck-in of a melt-extruded thermoplastic resin.
  • FIG. 3 is a view for
  • FIG. 7 is a diagram for explaining a method of producing a pre-stretch film (composite film) made of the first thermoplastic resin and the second thermoplastic resin.
  • FIG. 8 is a diagram for explaining neck-in of a thermoplastic resin melt-extruded when a composite film is manufactured.
  • FIG. 9 is a diagram for explaining an example of a thermoplastic resin that shrinks immediately after being melt-extruded when a composite film is manufactured.
  • FIG. 10 is a diagram illustrating an example of the thickness of the composite film with respect to the position in the width direction.
  • FIG. 11 is a diagram for explaining a method of stretching a composite film by a simultaneous biaxial stretching method in a stretching step.
  • FIG. 12 is a graph showing the glass transition temperature of a mixed resin obtained by blending polyethylene terephthalate (PET) with polycarbonate (PC).
  • FIG. 13 is a diagram for explaining another example of a composite film that shrinks immediately after being melt-extruded.
  • FIG. 14 is a graph showing the results of measuring the thickness of the composite films and stretched films produced in Examples and Comparative Examples with respect to the width direction position.
  • the method for producing a stretched film according to the first embodiment includes a pre-stretch film forming step of forming a pre-stretch film by melt-extruding a thermoplastic resin with a molding T-die, and the pre-stretch film in the length direction. And a stretching step of heating and stretching in the width direction.
  • the pre-stretching film forming step is a step of obtaining the pre-stretching film 100 by melt-extruding a thermoplastic resin from a T die.
  • FIG. 1 is a figure for demonstrating the film formation process before extending
  • thermoplastic resin is supplied to the T dice 220 through the feed block 210 in a state of being melted by heating.
  • the feed block 210 is connected to a melt extruder (not shown) for melt-extruding a thermoplastic resin.
  • the melt extruder is not particularly limited, and either a single screw extruder or a twin screw extruder can be used.
  • the thermoplastic resin is supplied to the feed block 210 by being melt-extruded at a temperature equal to or higher than the melting point (melting) temperature by a melt extruder.
  • the thermoplastic resin may be selected according to the intended use of the stretched film.
  • acrylic resin PMMA
  • cyclic olefin copolymer COC
  • PC polycarbonate
  • PET polyester terephthalate
  • thermoplastic resin supplied from the feed block 210 is widened in the width direction by the manifold 221 provided in the T die 220, and is thereby extruded from the die slip 222 into a sheet shape.
  • the extruded sheet-like thermoplastic resin is continuously taken up by the touch roll 230 and the cooling roll 240, and sandwiched and cooled to be solidified to obtain the unstretched film 100.
  • stretching is wound up by the film winding roll (not shown) before extending
  • FIG. 2 is a view showing a cross section of the die slip 222 of the T-die 220 and the pre-stretching film 100 formed in the present embodiment. The relationship with the width of the film 100 is shown.
  • the thermoplastic resin is melt-extruded by the width of the die slip 222 by the T-die 220, but after being melt-extruded until taken up by the cooling roll 240.
  • neck-in that shrinks in the width direction occurs, and the width of the resulting unstretched film 100 becomes smaller than the width dimension of the die slip 222.
  • thermoplastic resin melt-extruded from the T-die 220 contracts in the direction of the arrow shown in FIG. 2, that is, the direction at which the center of the unstretched film 100 is indicated by the arrow ( It is generated by contracting in the direction (thickness direction and width direction) indicated by the arrows. Then, the thermoplastic resin melt-extruded from the T-die 220 contracts by neck-in so that the cross-sectional shape becomes as shown in FIG.
  • FIG. 3 is a diagram for explaining the shrinkage of the melt-extruded thermoplastic resin.
  • the thermoplastic resin melt-extruded from the T-die 220 is, as shown in FIG. 3, the thermoplastic resin due to the presence of the adjacent thermoplastic resin in the portion that becomes the central portion 110 of the unstretched film 100.
  • the thermoplastic resin contracts in the thickness direction as indicated by the arrows due to the planar extension extending along the surface ⁇ located at or near the center in the thickness direction.
  • the thermoplastic resin melt-extruded from the T-die 220 has a thermoplastic resin adjacent to the outer side surfaces of both end portions 120 at the portions to be the both end portions 120 of the unstretched film 100 as shown in FIG.
  • thermoplastic resin does not exist, the thermoplastic resin flows relatively freely.
  • the uniaxial extension extending about the axis ⁇ passing through the center of the both ends 120 or near the center position causes the width in addition to the thickness direction as shown by the arrows. It also shrinks in the direction.
  • the boundary part 130 of the shape dented in the thickness direction is formed by the difference in the shrinkage
  • FIG. 4 is a figure which shows an example of the result of having measured the thickness with respect to the position of the width direction about the film 100 before extending
  • the boundary portion 130 of the formed pre-stretching film 100 is too thin with respect to the thickness of the central portion 110, the boundary where the thickness is thin when the pre-stretching film 100 is heat stretched in the stretching step. There is a problem that cracks are likely to occur in the portion 130 and heating and stretching cannot be performed appropriately.
  • the average thickness of the central portion 110 is set to t c for the unstretched film 100 formed by melt extrusion using a T-die 220 and drawing by a cooling roll 240.
  • the minimum thickness of the boundary 130 is t b
  • the ratio of these thicknesses “t b / t c ” is adjusted to 0.75 or more to heat the unstretched film 100 as will be described later.
  • the average thickness t c of the central portion 110 shown in FIG. 4 is an average value of the thickness of the portion where the thickness of the central portion 110 is stable.
  • the thickness is ⁇ 5 with respect to the center of the central portion 110. It can be an average value of thickness in a region within ⁇ 10%.
  • the minimum thickness t b of the boundary portion 130, of the two minimum thickness of the boundary portion 130 of the pre-stretch film 100 a more thinner thickness.
  • the stretching step is a step of heating and stretching the pre-stretching film 100 obtained by the pre-stretching film forming step in the length direction and the width direction.
  • FIG. 5 is a figure for demonstrating an extending process.
  • the unstretched film 100 is sent out from the above-described unstretched film winding roll, and the length direction and the width direction are held while the unstretched film 100 is held by the clip 310 as shown in FIG.
  • the film 100 before stretching is heated and stretched by a simultaneous biaxial stretching method in which the film is stretched simultaneously.
  • the unstretched film 100 is continuously fed out from the unstretched film winding roll, the unstretched film 100 is gripped at regular intervals using a plurality of clips, and each of the clips 310 is stretched before stretching.
  • the film 100 is transported into the stretching furnace 320, and in the stretching furnace 320, the pre-stretching film 100 is pulled in the length direction and the width direction by each clip 310 to be stretched.
  • the unstretched film 100 is transported while being held by the clip 310, so that it passes through the stretching furnace 320, and is stretched in the pre-tropical zone in the stretching furnace 320.
  • the pre-film 100 is preheated to a temperature that is about 10 to 30 ° C.
  • a stretched film can be obtained by cooling and solidifying in the cooling heat fixed zone following this. And the stretched film can be obtained continuously by opening the clip 310 and winding up with a roll.
  • a pair of guide rails for moving the clip 310 so as to pass through the drawing furnace 320 is provided.
  • the pair of guide rails are respectively installed at the position of the clip 310 that holds the upper side of the pre-stretching film 100 shown in FIG. 5 and the position of the clip 310 that holds the lower side. They are parallel, separated from each other in the width direction of the pre-stretching film 100 in the stretching band, and parallel to each other in the cooling heat fixing band.
  • the distance between the pair of guide rails in the cooling heat fixing band is determined in consideration of the shrinkage when the stretched film heated and stretched in the stretching band is solidified.
  • the width of the stretched film on the side On the basis of the width of the stretched film on the side, it may be approximated by several percent in the width direction.
  • the clip 310 that holds the unstretched film 100 moves along such a guide rail so that the unstretched film 100 can be conveyed and stretched.
  • the pre-stretching film 100 is stretched in the stretching zone in the stretching furnace 320 using the clip 310 that moves along such a guide rail. That is, in the stretching zone in the stretching furnace 320, the clip 310 that holds the unstretched film 100 is moved so as to spread in the width direction along the guide rail, and at the same time, the interval between the clips 310 is increased. Thus, the unstretched film 100 is pulled in the length direction and the width direction as indicated by arrows in FIG. Thereby, the film 100 before extending
  • stretching is heat-stretched, Then, it is cooled and solidified in the cooling heat fixing zone in the stretching furnace 320, and is wound up by a roll installed outside the stretching furnace 320.
  • a stretched film can be obtained continuously.
  • the stretch ratio with respect to the stretching direction is preferably within 3 times, more preferably within 2.5 times, and even more preferably within 2 times. .
  • the stretched film obtained by heating and stretching the pre-stretched film 100 has a thickness of the central portion 110 of preferably 15 to 50 ⁇ m, more preferably 20 to 40 ⁇ m.
  • the stretched film obtained by heating and stretching the pre-stretched film 100 may be removed by cutting the both ends 120 as necessary. Thereby, the part of the both ends 120 with especially thick thickness in a stretched film can be removed, and the thickness of the whole stretched film can be equalize
  • a stretched film is obtained by forming the unstretched film 100 made of a thermoplastic resin in the pre-stretching film forming step and heating and stretching the pre-stretched film 100 in the stretching step. be able to.
  • the pre-stretch film 100 when the pre-stretch film 100 is formed by the pre-stretch film forming step, the ratio “t b ” between the average thickness t c of the central portion 110 and the minimum thickness t b of the boundary portion 130.
  • the thickness of the unstretched film 100 is adjusted so that “/ t c ” is 0.75 or more.
  • stretching has a low extending
  • the stretching stress at the boundary portion 130 gradually increases, and when the stretching stress necessary for stretching at the central portion 110 is reached, the central portion 110 is also stretched following the boundary portion 130. Become so.
  • the boundary portion 130 breaks before the central portion 110 starts to be stretched while the boundary portion 130 is being stretched. End up.
  • the thickness of the boundary portion 130 is too small with respect to the central portion 110, the impact when releasing the unstretched film 100 from the clip 310 and the obtained stretched film after heating and stretching as shown in FIG. Cracks are also generated in the boundary portion 130 due to the stress at the time of winding on the roll.
  • the average thickness t c of the central portion 110 and the minimum of the boundary portion 130 of the unstretched film 100 formed by being melt-extruded by the T-die 220 and then pulled by the cooling roll 240 By adjusting the ratio “t b / t c ” to the thickness t b within the above range, when the film 100 before stretching is heated and stretched, the occurrence of cracks at the boundary portion 130 can be effectively prevented, The productivity of the film can be improved.
  • the ratio “t b / t c ” between the average thickness t c of the central portion 110 and the minimum thickness t b of the boundary portion 130 may be 0.75 or more as described above. , Preferably 0.8 or more, more preferably 0.9 or more.
  • the ratio “t b / t c ” between the average thickness t c of the central portion 110 and the minimum thickness t b of the boundary portion 130 is adjusted to the above range for the pre-stretch film 100 to be formed.
  • the method used for example, a method using a resin having a lower extensional viscosity as the thermoplastic resin, a method of adjusting the slit width of the die slip 222 of the T die 220, and the method of using the T die 220 and the cooling roll 240.
  • a method of reducing the distance, a method of reducing the take-up speed of the pre-stretching film 100 by the cooling roll 240, or the like can be used alone or in combination.
  • the type of applicable thermoplastic resin is not limited, and the slit width of the die slip 222 is adjusted from the viewpoint of not reducing the production efficiency of the pre-stretching film 100. It is preferable to use the method to do.
  • the ratio "t s / t c" of the average thickness t c of the slit width t s and the central portion 110 of the die lip 222 preferably It adjusts so that it may be 8.0 or less, More preferably, it is 6.0 or less, More preferably, it is 5.0 or less.
  • the thickness of the unstretched film 100 obtained by melt extrusion with the T die 220 can be made more uniform, and the ratio “t b ” between the average thickness t c of the central portion 110 and the minimum thickness t b of the boundary portion 130. / T c ”can be appropriately adjusted to the above range.
  • the pre-stretched film 100 to be formed the ratio "t b / t c" with minimum thickness t b of the average thickness t c and the boundary portion 130 of the central portion 110 as described above the
  • the maximum thickness of the both end portions 120 it is possible to more effectively prevent the pre-stretching film 100 from being broken during the heat stretching.
  • the maximum thickness of the end portions 120 when the t e, the average of the maximum thickness t e and the central portion 110 of the end portions 120 is preferably adjusted to 1.0 to 3.0, more preferably 1.0 to 2.0, and still more preferably 1.0 to 1.5.
  • the pressure concentrates on both ends 120 and the pressure is not uniformly transmitted to the entire unstretched film 100, and the thickness of the unstretched film 100 varies, and this is heated.
  • the thickness of the stretched film obtained by stretching also tends to vary.
  • both end portions 120 it is preferable to smooth the side surfaces of both end portions 120 before heating and stretching the pre-stretch film 100 formed by the pre-stretch film forming step.
  • smoothing the side surfaces of both end portions 120 of the pre-stretching film 100 when the pre-stretching film 100 is heated and stretched by pulling the both end portions 120 of the pre-stretching film 100 in the stretching step, Concentration of local stress due to roughness can be prevented, generation of tears at both ends 120 can be prevented, and productivity of the stretched film can be improved.
  • the method for smoothing the side surfaces of both end portions 120 of the unstretched film 100 is not particularly limited, but a method of trimming a predetermined width from both side surfaces of both end portions 120 with a cutter, a method for polishing the end portions of both end portions 120, For example, a method of heat-pressing the end portions of the both end portions 120 can be used.
  • the smoothing of the side surfaces of both end portions 120 reduces the unevenness of the side surfaces of both end portions 120, and when the pre-stretch film 100 is pulled in the length direction, stress is not concentrated on a part of both end portions 120. You can go to
  • any cutter can be used as long as it can smoothly smooth the side surfaces of both ends 120 by trimming.
  • You can use a rotary shear cutter that continuously rotates while rubbing the blade and lower blade and cut by shearing, or a laser cutter that uses a solid laser, semiconductor laser, liquid laser, gas laser, etc. From the viewpoint that the stress applied to the pre-stretching film 100 can be reduced and the occurrence of cracks in the pre-stretching film 100 during trimming can be prevented, a laser cutter is preferable.
  • both end portions 120 of the pre-stretched film 100 it is preferable to trim the both end portions 120 while heating. Thereby, the side surfaces of both end portions 120 can be made smoother, and breakage of the pre-stretching film 100 when the pre-stretching film 100 is heated and stretched can be more appropriately prevented.
  • a simultaneous biaxial stretching method in which the pre-stretching film 100 is heated and stretched in both the length direction and the width direction is used.
  • the heat stretching in the length direction of the pre-stretching film 100 can be performed in the same manner as the simultaneous biaxial stretching method shown in FIG. That is, the film 100 before stretching is conveyed into the stretching furnace 320 while being gripped by the clip 310, and then heated and stretched only in the length direction by the clip 310 gripping the film 100 before stretching in the stretching furnace 320. Can be used.
  • the unstretched film 100 is clipped 310 as shown in FIG.
  • stretching while gripping with it is possible to improve the productivity of the stretched film compared to the conventional sequential biaxial stretching method, and the obtained stretched film has excellent quality can do.
  • the conventional sequential biaxial stretching method is a method in which the pre-stretching film 100 produced by the method shown in FIG. 1 is first heat stretched in the length direction and then heat stretched in the width direction.
  • the film 100 before stretching is heated and stretched in the length direction by being conveyed by a plurality of rolls, and then the width of the film 100 while being held by the clip 310 as shown in FIG. Heat stretch in the direction.
  • the stretching in the length direction of the pre-stretching film 100 in the sequential biaxial stretching method is specifically performed as follows. That is, according to the sequential biaxial stretching method, the pre-stretching film 100 is preheated to the glass transition temperature of the thermoplastic resin constituting the pre-stretching film 100 while being transported by a plurality of preheated preheated rolls. The heated unstretched film 100 is continuously transported by a cooling roll while keeping heat by an infrared heater or the like. At this time, by making the conveyance speed by the cooling roll faster than the conveyance speed by the pre-tropical roll, a tension is generated between the pre-tropical roll and the cooling roll. Is stretched in the length direction to a necessary stretching ratio.
  • the sequential biaxial stretching method when the pre-stretching film 100 is stretched in the length direction, the surface of the pre-stretching film 100 comes into contact with the preheating roll and the cooling roll. Scratches may occur on the surface, and the appearance quality of the obtained stretched film may be deteriorated. Further, in the sequential biaxial stretching method, when the film 100 before stretching is heated and stretched in the length direction, since the both ends 120 of the film 100 before stretching are not fixed with clips or the like, the film 100 before stretching is heated. There exists a possibility that it may shrink
  • the film 100 before stretching is stretched in the length direction by using the simultaneous biaxial stretching method described above or the method of uniaxial stretching only in the length direction described above. (That is, by using a method of stretching in the length direction while holding the pre-stretching film 100 with the clip 310 as shown in FIG. 5), it is possible to avoid contact with the roll.
  • the stretched film obtained by heating and stretching the pre-stretched film 100 can improve the appearance quality by reducing the scratches on the surface, and is particularly suitable for use in optical films and the like that have strict requirements on the appearance quality. it can.
  • stretching is hold
  • fever is carried out. This can be prevented and the productivity of the stretched film can be improved.
  • thermoplastic resin PA and the second thermoplastic resin PC different from the first thermoplastic resin are melt-coextruded by a molding T die.
  • stretching to a length direction and the width direction are provided.
  • the pre-stretching film forming step is a step of forming the pre-stretching film 100 by melt coextruding the first thermoplastic resin PA and the second thermoplastic resin PC from a T die.
  • FIG. 7 is a figure for demonstrating the film formation process before extending
  • the pre-stretch film 100 the first thermoplastic resin PA that forms an inner region located on the inner side in the width direction of the pre-stretch film 100, and the width of the pre-stretch film 100 A film made of the second thermoplastic resin PC forming the outer region located on the outer side in the direction is obtained.
  • the inner region formed by the first thermoplastic resin PA coincides with the central portion 110 of the first embodiment described above, and the outer region formed by the second thermoplastic resin PC is the above-mentioned.
  • region may be inconsistent with the center part 110 and the both ends 120, respectively.
  • the inner region made of the first thermoplastic resin PA has a shape covering a part of the outer region made of the second thermoplastic resin PC, and the inner region and the outer region are It may be inconsistent with the center part 110 and the both end parts 120, respectively.
  • both end portions 120 of the unstretched film 100 are for reinforcing the central portion 110 when the unstretched film 100 is heated and stretched, and are cut as necessary after the unstretched film 100 is stretched by heating. Can be removed.
  • thermoplastic resin PA and the second thermoplastic resin PC are supplied to the T dice 220 through the feed block 210 in a state of being heated and melted.
  • the feed block 210 includes a first melt extruder (not shown) for melt-extruding the first thermoplastic resin PA and a melt-extrusion for the second thermoplastic resin PC.
  • Second melt extruders are connected to each other. These melt extruders are not particularly limited, and any of a single screw extruder and a twin screw extruder can be used.
  • the first thermoplastic resin PA and the second thermoplastic resin PC are melt-extruded at a temperature equal to or higher than the melting point (melting) temperature by the respective melt extruders, thereby providing a feed block. 210 is supplied.
  • the unstretched film 100 obtained by the T dice 220 is as shown in FIG.
  • the first thermoplastic resin PA and the second thermoplastic resin PA and the second thermoplastic resin PA are formed such that both end portions 120 made of the second thermoplastic resin PC are formed at both ends of the central portion 110 made of the first thermoplastic resin PA.
  • the thermoplastic resin PC is supplied.
  • the feed block 210 has an inlet for supplying the first thermoplastic resin PA and an inlet for supplying the first thermoplastic resin PA in the widening direction of the T die 220. On both sides, an inlet for supplying the second thermoplastic resin PC is separately provided.
  • the first thermoplastic resin PA and the second thermoplastic resin PC respectively introduced from the inlet of the feed block 210 are merged in the feed block 210, and at the outlet of the feed block 210, T
  • the first thermoplastic resin PA flows in the central portion
  • the second thermoplastic resin PC flows out in a manner such that the second thermoplastic resin PC flows in both end portions of the first thermoplastic resin PA. This is supplied to the T dice 220.
  • the first thermoplastic resin PA and the second thermoplastic resin PC supplied from the feed block 210 are fed in the width direction (first thermal resin) by the manifold 221 provided in the T die 220. In the direction in which the plastic resin PA and the second thermoplastic resin PC are lined up), and thereby co-extruded from the die slip 222 into a sheet shape.
  • the co-extruded sheet-like first thermoplastic resin PA and second thermoplastic resin PC are continuously taken up by the touch roll 230 and the cooling roll 240 as shown in FIG. And by solidifying the pre-stretched film 100 provided with a central portion 110 made of the first thermoplastic resin PA and both end portions 120 formed at both ends of the central portion 110 and made of the second thermoplastic resin PC. Make it.
  • stretching is wound up by the film winding roll (not shown) before extending
  • stretching which consists of 1st thermoplastic resin PA and 2nd thermoplastic resin PC which are obtained in this way the film 100 before extending
  • neck-in that shrinks in the width direction occurs after being melt-extruded from the die slip 222 of the T die 220 and taken up by the cooling roll 240.
  • FIG. 8 is a diagram showing a cross section of the die slip 222 of the T-die 220 and the pre-stretching film 100 formed in the present embodiment, and the dimensions in the width direction of the die slip 222 and the pre-stretching formed. The relationship with the width of the film 100 is shown.
  • the pre-stretch film 100 when the pre-stretch film 100 is formed, the first thermoplastic resin PA and the second thermoplastic resin PC are melt-extruded by the T die 220 with the width of the die slip 222.
  • Neck-in that shrinks in the width direction occurs as indicated by the arrow shown in FIG. 8 after being melt extruded and taken up by the cooling roll 240, and the width of the film 100 before stretching is the width of the die slip 222. Smaller than the direction dimension.
  • Such a neck-in is a portion where the thermoplastic resin melt-extruded from the T-die 220 contracts in the direction of the arrow shown in FIG.
  • the inner region in the width direction of the front film 100 is shrunk in the thickness direction as indicated by the arrows, and the portions (that is, the outer regions in the width direction of the pre-stretching film 100) that are both ends 120 of the pre-stretching film 100 are indicated by the arrows
  • it is generated by shrinking in the thickness direction and width direction.
  • the first thermoplastic resin PA and the second thermoplastic resin PC melt-extruded from the T die 220 are contracted by neck-in, so that the cross-sectional shape becomes as shown in FIG.
  • FIG. 9 is a diagram for explaining the shrinkage of the melt-extruded first thermoplastic resin PA and second thermoplastic resin PC.
  • the first thermoplastic resin PA and the second thermoplastic resin PC melt-extruded from the T-die 220 are portions that become the central portion 110 of the pre-stretch film 100 (see FIG. 9).
  • the flow direction of the thermoplastic resin is limited by the presence of the adjacent thermoplastic resin, so that the thermoplastic resin is aligned along the plane ⁇ located at or near the center of the thickness direction. Due to the planar expansion, the film contracts in the thickness direction as indicated by the arrow.
  • thermoplastic resin melt-extruded from the T-die 220 is formed on the outer side surfaces of both end portions 120 as shown in FIG. Since the adjacent thermoplastic resin does not exist, the thermoplastic resin flows relatively freely, and as a result, the uniaxial extension extending about the axis ⁇ passing through the center of the both ends 120 or near the center position is indicated by an arrow. As well as shrinking in the width direction in addition to the thickness direction. Thereby, between the center part 110 and the both ends 120, that is, between the inner region and the outer region in the width direction, a boundary portion 130 having a shape recessed in the thickness direction is formed due to the difference in the shrinking form of the thermoplastic resin. It is formed.
  • FIG. 10 is a figure which shows an example of the result of having measured the thickness with respect to the position of the width direction about the film 100 before extending
  • the boundary portion 130 of the formed pre-stretching film 100 is too thin with respect to the thickness of the central portion 110, the boundary where the thickness is thin when the pre-stretching film 100 is heat stretched in the stretching step. There is a problem that cracks are likely to occur in the portion 130 and heating and stretching cannot be performed appropriately.
  • the average thickness of the central portion 110 is t c for the unstretched film 100 formed by being melt-extruded by the T-die 220 and taken by the cooling roll 240.
  • the minimum thickness of the boundary 130 is t b
  • the ratio of these thicknesses “t b / t c ” is adjusted to 0.75 or more to heat the unstretched film 100 as will be described later.
  • the average thickness t c of the central portion 110 shown in FIG. 10 is the average value of the thickness of the portion where the thickness of the central portion 110 is stable.
  • the thickness is ⁇ 5 based on the center of the central portion 110. It can be an average value of thickness in a region within ⁇ 10%.
  • the minimum thickness t b of the boundary portion 130, of the two minimum thickness of the boundary portion 130 of the pre-stretch film 100 a more thinner thickness.
  • the stretching step is a step of heating and stretching the pre-stretching film 100 obtained by the pre-stretching film forming step in the length direction and the width direction.
  • FIG. 11 is a figure for demonstrating an extending process.
  • the unstretched film winding roll 100 is fed out from the unstretched film take-up roll described above, and the length of the stretched film 100 is gripped by the clips 310 as shown in FIG.
  • the film 100 before stretching is heated and stretched by a simultaneous biaxial stretching method in which the film and the width direction are simultaneously stretched.
  • the unstretched film 100 is continuously fed out from the unstretched film winding roll, and the two ends 120 of the unstretched film 100 are gripped at regular intervals using a plurality of clips.
  • the unstretched film 100 is conveyed into the stretching furnace 320 by 310, and in the stretching furnace 320, the unstretched film 100 is pulled in the length direction and the width direction by the respective clips 310.
  • the unstretched film 100 is transported while being held by the clip 310, so that it passes through the stretching furnace 320, and is stretched in the pre-tropical zone in the stretching furnace 320.
  • the pre-film 100 is preheated to a temperature about 10 to 30 ° C.
  • a stretched film can be obtained by cooling and solidifying in the cooling heat fixed zone following this. And the stretched film can be obtained continuously by opening the clip 310 and winding up with a roll.
  • a pair of guide rails for moving the clip 310 so as to pass through the drawing furnace 320 is provided.
  • the pair of guide rails are respectively installed at the position of the clip 310 that holds the upper ends 120 of the pre-stretch film 100 shown in FIG. 11 and the position of the clip 310 that holds the lower ends 120.
  • they are parallel to each other, in the stretching zone, they are separated from each other in the width direction of the pre-stretching film 100, and in the cooling heat fixing zone, they are also parallel to each other.
  • the distance between the pair of guide rails in the cooling heat fixing band is determined in consideration of the shrinkage when the stretched film heated and stretched in the stretching band is solidified. On the basis of the width of the stretched film on the side, it may be approximated by several percent in the width direction.
  • the clip 310 that holds the both end portions 120 of the unstretched film 100 moves along such guide rails so that the unstretched film 100 can be conveyed and stretched.
  • the pre-stretching film 100 is stretched in the stretching zone in the stretching furnace 320 using the clip 310 that moves along such a guide rail. That is, in the stretching zone in the stretching furnace 320, the clip 310 holding the both ends 120 of the unstretched film 100 is moved so as to spread in the width direction along the guide rail, and the interval between the clips 310 is also increased.
  • both end portions 120 of the unstretched film 100 are pulled in the length direction and the width direction as indicated by arrows in FIG. Thereby, the center part 110 and the both ends 120 of the film 100 before extending
  • the thickness of the central portion 110 of the unstretched film 100 after heat stretching is preferably 15 to 50 ⁇ m, more preferably 20 to 40 ⁇ m.
  • the stretched film obtained by heating and stretching the pre-stretched film 100 may be removed by cutting both ends 120 as necessary. Thereby, a stretched film can be made into the film which consists only of the center part 110.
  • FIG. 1 the stretched film obtained by heating and stretching the pre-stretched film 100 may be removed by cutting both ends 120 as necessary.
  • the pre-stretching film forming step before stretching, includes the central portion 110 made of the first thermoplastic resin PA and the both end portions 120 made of the second thermoplastic resin PC.
  • a stretched film can be obtained by forming the film 100 and heating and stretching the central portion 110 and both end portions 120 of the unstretched film 100 by a stretching step.
  • the pre-stretch film 100 when the pre-stretch film 100 is formed by the pre-stretch film forming step, the ratio “t b ” between the average thickness t c of the central portion 110 and the minimum thickness t b of the boundary portion 130.
  • the thickness of the unstretched film 100 is adjusted so that “/ t c ” is 0.75 or more.
  • stretching has a low extending
  • the stretching stress at the boundary portion 130 gradually increases, and when the stretching stress necessary for stretching at the central portion 110 is reached, the central portion 110 is also stretched following the boundary portion 130. Become so.
  • the boundary portion 130 breaks before the central portion 110 starts to be stretched while the boundary portion 130 is being stretched. End up.
  • the thickness of the boundary portion 130 is too thin with respect to the central portion 110, after the heat stretching as shown in FIG. 11, the impact when releasing the unstretched film 100 from the clip 310, and the obtained stretched film Cracks are also generated in the boundary portion 130 due to the stress at the time of winding on the roll.
  • the central portion 110 and the both end portions 120 are formed of the same thermoplastic resin (that is, In the same way, when the film 100 before stretching shown in FIG. 9 is a single-layer film made of one kind of resin, when being melt-extruded from the T-die 220, the central portion 110 (inner region in the width direction) ) And the end portion 120 (outer region in the width direction), the boundary portion becomes thin due to the difference in the contraction form of the thermoplastic resin.
  • the average thickness t c of the central portion 110 and the boundary portion 130 By adjusting the ratio “t b / t c ” to the minimum thickness t b within the above range, it is possible to effectively prevent the occurrence of cracks at the boundary 130 when the film 100 before stretching is heated and stretched, Productivity of the stretched film can be improved.
  • the film 100 before being stretched may be imprinted, or that a deposit may be mixed in the product roll of the stretched film and deteriorate the quality of the stretched film. Further, when such a deposit of rubber elastic particles is formed, when the film 100 before stretching is heated and stretched using the clip 310 as shown in FIG. There is also a risk that the deposit will enter the film, and the pre-stretched film 100 may be easily broken.
  • the ratio “t b / t c ” between the average thickness t c of the central portion 110 and the minimum thickness t b of the boundary portion 130 may be 0.75 or more as described above. , Preferably 0.8 or more, more preferably 0.9 or more.
  • the ratio “t b / t c ” between the average thickness t c of the central portion 110 and the minimum thickness t b of the boundary portion 130 is adjusted to the above range for the pre-stretch film 100 to be formed.
  • the method used for example, a method using a resin having a lower extensional viscosity as the thermoplastic resin, a method of adjusting the slit width of the die slip 222 of the T die 220, and the method of using the T die 220 and the cooling roll 240.
  • a method of reducing the distance, a method of reducing the take-up speed of the pre-stretching film 100 by the cooling roll 240, or the like can be used alone or in combination.
  • the type of applicable thermoplastic resin is not limited, and the slit width of the die slip 222 is adjusted from the viewpoint of not reducing the production efficiency of the pre-stretching film 100. It is preferable to use the method to do.
  • the ratio "t s / t c" of the average thickness t c of the slit width t s and the central portion 110 of the die lip 222 preferably It adjusts so that it may be 8.0 or less, More preferably, it is 6.0 or less, More preferably, it is 5.0 or less.
  • the thickness of the unstretched film 100 obtained by melt extrusion with the T die 220 can be made more uniform, and the ratio “t b ” between the average thickness t c of the central portion 110 and the minimum thickness t b of the boundary portion 130. / T c ”can be appropriately adjusted to the above range.
  • the pre-stretched film 100 to be formed the ratio "t b / t c" with minimum thickness t b of the average thickness t c and the boundary portion 130 of the central portion 110 as described above the
  • the maximum thickness of the both end portions 120 it is possible to more effectively prevent the pre-stretching film 100 from being broken during the heat stretching.
  • the maximum thickness of the end portions 120 when the t e, the average of the maximum thickness t e and the central portion 110 of the end portions 120 is preferably adjusted to 1.0 to 3.0, more preferably 1.0 to 2.0, and still more preferably 1.0 to 1.5.
  • the maximum thickness t e of the end portions 120 is too thick, the unstretched film 100 obtained by melt co-extrusion by a T die 220, the touch roll 230 and the cooling When pinching with the roll 240, the both end portions 120 are too thick, so that the pressure is concentrated on the both end portions 120 and the pressure is not uniformly transmitted to the whole unstretched film 100, and thereby the thickness of the unstretched film 100 varies.
  • the thickness of the stretched film obtained by heating and stretching the pre-stretching film 100 also tends to vary.
  • the first thermoplastic resin PA for forming the central portion 110 may be selected according to the intended use of a stretched film, such as an acrylic resin (PMMA). , Cyclic olefin copolymer (COC) and the like can be used.
  • PMMA acrylic resin
  • COC Cyclic olefin copolymer
  • the second thermoplastic resin PC for forming the end portions 120 for example, the glass transition temperature Tg 1 of the first thermoplastic resin PA, glass transition temperature Tg 2 of the second thermoplastic resin PC It is preferable to use a thermoplastic resin having a difference (
  • a thermoplastic resin having a difference (
  • the difference in glass transition temperature between the first thermoplastic resin PA and the second thermoplastic resin PC (
  • the second thermoplastic resin PC specifically, the following thermoplastic resin can be used based on the viewpoint described above.
  • the second thermoplastic resin PC when an acrylic resin is used for the first thermoplastic resin PA, one kind of polyethylene naphthalate (PEN), cyclic olefin polymer (COP), etc. is used alone.
  • PEN polyethylene naphthalate
  • COP cyclic olefin polymer
  • a mixed resin in which two or more kinds are mixed can be used.
  • thermoplastic resin PC a resin obtained by adding a small amount of rubber elastic particles to the above-described first thermoplastic resin PA within a range not inhibiting the productivity of the stretched film may be used.
  • the second thermoplastic resin PC has a glass transition temperature higher than that of the first thermoplastic resin PA, and the difference between the thermoplastic resin (heat-resistant thermoplastic resin) exceeding 10 ° C.
  • a mixed resin formed by blending a thermoplastic resin (low temperature meltable thermoplastic resin) having a glass transition temperature lower than that of the first thermoplastic resin PA can be used.
  • the glass transition temperature of the obtained mixed resin is adjusted with the first thermoplastic resin PA by adjusting the blending ratio of the heat-resistant thermoplastic resin and the low-melting thermoplastic resin.
  • ) is preferably adjusted to be in the above range.
  • thermoplastic resin PA a polycarbonate having a high glass transition temperature of about 150 ° C. is used as the second thermoplastic resin PC.
  • PC polycarbonate having a high glass transition temperature of about 150 ° C.
  • PET polyethylene terephthalate
  • thermoplastic resin PC polycarbonate (PC), cyclic olefin polymer (COP), or the like can be used as the heat-resistant thermoplastic resin.
  • polyester such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), acrylonitrile / butadiene / styrene (ABS), polyethylene (PE), glass from the first thermoplastic resin.
  • An acrylic resin, polyester (PEs), polybutylene terephthalate (PBT), or the like having a low transition temperature can be used.
  • polycarbonate PC
  • polyethylene terephthalate polyethylene terephthalate (low-melting thermoplastic resin)
  • PET polyethylene terephthalate
  • FIG. 12 is a graph showing the results of measuring the glass transition temperature of a mixed resin obtained by blending polyethylene terephthalate (PET) with polycarbonate (PC).
  • PET polyethylene terephthalate
  • PC polycarbonate
  • DSC differential scanning calorimetry
  • the mixed resin in which polycarbonate (PC) is blended with polyethylene terephthalate (PET) can change the glass transition temperature according to the content ratio of polyethylene terephthalate (PET).
  • PET polyethylene terephthalate
  • the glass transition temperature Tg 2 of the second thermoplastic resin PC can be easily adjusted.
  • ) between the glass transition temperature Tg 1 and the other thermoplastic resin PA can be controlled within the above range.
  • both end portions 120 it is preferable to smooth the side surfaces of both end portions 120 before heating and stretching the pre-stretch film 100 formed by the pre-stretch film forming step.
  • smoothing the side surfaces of both end portions 120 of the pre-stretching film 100 when the pre-stretching film 100 is heated and stretched by pulling the both end portions 120 of the pre-stretching film 100 in the stretching step, Concentration of local stress due to roughness can be prevented, generation of tears at both ends 120 can be prevented, and productivity of the stretched film can be improved.
  • the method for smoothing the side surfaces of both end portions 120 of the unstretched film 100 is not particularly limited, but a method of trimming a predetermined width from both side surfaces of both end portions 120 with a cutter, a method for polishing the end portions of both end portions 120, For example, a method of heat-pressing the end portions of the both end portions 120 can be used.
  • the smoothing of the side surfaces of both end portions 120 reduces the unevenness of the side surfaces of both end portions 120, and when the pre-stretch film 100 is pulled in the length direction, stress is not concentrated on a part of both end portions 120.
  • any cutter can be used as long as it can smoothly smooth the side surfaces of both ends 120 by trimming.
  • You can use a rotary shear cutter that continuously rotates while rubbing the blade and lower blade and cut by shearing, or a laser cutter that uses a solid laser, semiconductor laser, liquid laser, gas laser, etc.
  • a laser cutter is preferable from the viewpoint that the stress applied to the unstretched film 100 can be reduced and the occurrence of cracks in the unstretched film 100 during trimming can be prevented.
  • both end portions 120 of the pre-stretched film 100 it is preferable to trim the both end portions 120 while heating. Thereby, the side surfaces of both end portions 120 can be made smoother, and breakage of the pre-stretching film 100 when the pre-stretching film 100 is heated and stretched can be more appropriately prevented.
  • a simultaneous biaxial stretching method in which the film 100 before stretching is heated and stretched in both the length direction and the width direction is used.
  • the heat stretching in the length direction of the pre-stretching film 100 can be performed in the same manner as the simultaneous biaxial stretching method shown in FIG.
  • the clips 310 are conveyed into the stretching furnace 320 while holding the both ends 120 of the unstretched film 100 with the clips 310, and then each clip 310 holding the both ends 120 of the unstretched film 100 in the stretching furnace 320.
  • a method of performing heat stretching only in the length direction can be used by widening the interval between the clips 310 without moving the clip in the width direction.
  • both end portions of the unstretched film 100 as shown in FIG. 11 in both the case where simultaneous biaxial stretching is performed in the length direction and the width direction, and the case where uniaxial stretching is performed only in the length direction.
  • stretching 120 while holding it with the clip 310 the productivity of the stretched film can be improved as compared with the conventionally used sequential biaxial stretching method, and the resulting stretched film can be improved in quality. It can be excellent.
  • the conventional sequential biaxial stretching method is a method in which the pre-stretched film 100 produced by the method shown in FIG. 7 is first stretched by heating in the length direction and then stretched in the width direction.
  • the film 100 before stretching is heated and stretched in the length direction by being conveyed by a plurality of rolls, and thereafter, both ends 120 of the film 100 before stretching are clipped by clips 310 as shown in FIG. Heat and stretch in the width direction while gripping.
  • the stretching in the length direction of the pre-stretching film 100 in the sequential biaxial stretching method is specifically performed as follows. That is, according to the sequential biaxial stretching method, the pre-stretched film 100 is preheated to about the glass transition temperature of both end portions 120 while being transported by a plurality of preheated rolls that have been preheated. While being further heated to a temperature about 10 to 30 ° C. higher than the glass transition temperature of the both ends 120 by an infrared heater or the like, it is continuously conveyed by a cooling roll. At this time, by making the conveyance speed by the cooling roll faster than the conveyance speed by the pre-tropical roll, a tension is generated between the pre-tropical roll and the cooling roll. Is stretched in the length direction to a necessary stretching ratio.
  • the sequential biaxial stretching method when the pre-stretching film 100 is stretched in the length direction, the surface of the pre-stretching film 100 comes into contact with the preheating roll and the cooling roll. Scratches may occur on the surface, and the appearance quality of the obtained stretched film may be deteriorated. Further, in the sequential biaxial stretching method, when the film 100 before stretching is heated and stretched in the length direction, since the both ends 120 of the film 100 before stretching are not fixed with clips or the like, the film 100 before stretching is heated. There exists a possibility that it may shrink
  • the film 100 before stretching is stretched in the length direction by using the simultaneous biaxial stretching method described above or the method of uniaxial stretching only in the length direction described above. (That is, by using a method of stretching in the length direction while holding both ends 120 of the unstretched film 100 with the clip 310 as shown in FIG. 11) to avoid contact with the roll. Therefore, scratches on the surface of the pre-stretching film 100 after heat stretching can be reduced.
  • the appearance quality can be improved, and in particular, it is preferably used for an optical film or the like that has a severe requirement for the appearance quality. Can do.
  • the both ends 120 of the film 100 before stretching are gripped by the clips 310. Shrinkage in the direction can be prevented, and the productivity of the stretched film can be improved.
  • the unstretched film 100 includes a central portion 110 made of the first thermoplastic resin PA and both end portions 120 made of the second thermoplastic resin PC.
  • the first thermoplastic resin PA and the second thermoplastic resin PC are within a range that does not hinder the production of the stretched film. It may be mixed.
  • the viscosity of the second thermoplastic resin PC that forms the outer region of the unstretched film 100 is equal to the viscosity of the first thermoplastic resin PA that forms the inner region of the unstretched film 100.
  • the center portion 110 may have a shape that covers a part of both end portions 120 as shown in FIG. 13.
  • the boundary portion 130 of the unstretched film 100 is formed at a position shifted from the boundary between the central portion 110 and both end portions 120.
  • the boundary portion 130 of the unstretched film 100 is recessed in the thickness direction due to the difference in shrinkage between the inner region and the outer region in the width direction of the thermoplastic resin melt-extruded from the T die 220. It is formed by the end. Therefore, as shown in FIG. 13, the pre-stretch film 100 in which the first thermoplastic resin and the second thermoplastic resin are mixed is formed by the difference in contraction form depending on the position in the width direction of the pre-stretch film 100.
  • the boundary portion 130 to be formed is formed at a position deviated from the boundary between the first thermoplastic resin PA and the second thermoplastic resin PC.
  • the second thermoplastic resin PC when performing melt coextrusion with the T-die 220, when the viscosity of the second thermoplastic resin PC is higher than the viscosity of the first thermoplastic resin PA, in the obtained pre-stretch film 100, Contrary to the unstretched film 100 shown in FIG. 13, the second thermoplastic resin PC having a higher viscosity flows on the surface of the central portion 110 and covers a part of the first thermoplastic resin PA. Become.
  • Example 1 An acrylic resin (glass transition temperature Tg 1 : 123 ° C., elongation at break at room temperature: 5%) was prepared as a thermoplastic resin for forming the pre-stretch film 100.
  • the glass transition temperature was measured by differential scanning calorimetry (DSC), and the elongation at break was measured by a tensile tester (manufactured by Orientec Co., Ltd., model number: RTC-1210A). The same applies to Example 2 and Comparative Example 1 below.
  • a pre-stretch film 100 was produced under the following conditions.
  • the produced unstretched film 100 had an overall width of about 310 mm.
  • the average thickness t c of the central portion 110 is 160 .mu.m
  • the minimum thickness t b of the boundary portion 130 is 128 .mu.m
  • the maximum thickness t e of the both end portions 120 in 290 ⁇ m
  • the thickness ratio “t b / t c ” was 0.8
  • “t e / t c ” was 1.81
  • “t s / t c ” was 5.0.
  • the results are shown in FIG.
  • the thickness corresponding to the position in the width direction of the unstretched film 100 is shown.
  • stretching was formed in the position of each about 40 mm from the edge part of the width direction of the film 100 before extending
  • T-die 220 outlet width direction dimension 380mm Slit width t s of die slip 222: 0.8 mm Distance between T dice 220 and cooling roll 240: 60 mm Take-up speed of cooling roll 240: 5 mpm
  • the obtained unstretched film 100 is gripped by a clip 310 and, as shown in FIG. 5, is stretched by heating in the length direction and the width direction under the following conditions by a simultaneous biaxial stretching method, and then by a roll.
  • a stretched film was obtained by winding.
  • the film 100 before stretching did not break while the film 100 before stretching was heated and stretched.
  • the thickness of the stretched film obtained was measured, the thickness of the portion corresponding to the boundary portion 130 was comparatively thick at 30 ⁇ m or more, and the product effective width (region having a thickness of 40 ⁇ m or more at the central portion 110) was 390 mm.
  • a stretched film secured relatively widely could be obtained. The results are shown in FIG.
  • Stretcher entrance speed 1 mpm Outlet speed of stretching machine: 2 mpm
  • Stretch ratio 100% in length direction x 100% in width direction (twice in length direction x double in width direction)
  • Clip 310 gripping position position 15 mm from the end of the film 100 before stretching Pretropical temperature, distance: 140 ° C., 350 mm Stretch zone temperature, distance: 140 ° C., 500 mm Cooling heat fixing temperature, distance: 90 ° C, 700mm
  • Example 2 In making the pre-stretch film 100, except that was enlarged slit width t s of die lip 222 to 1.2mm, with the pre-stretch film 100 and a stretched film in the same manner as in Example 1, measuring the thickness did. The result of having measured thickness about the film 100 before extending
  • the produced unstretched film 100 has an average thickness t c of the central portion 110 of 160 ⁇ m and a minimum thickness t b of the boundary portion 130 of 120 ⁇ m, and the ratio of these thicknesses “t b / t c ”. but 0.75, "t s / t c" was 7.5.
  • stretching before heat drawing becomes thin, and, as a result, the stretched film after heat drawing is shown in FIG. As shown, the product effective width (region having a thickness of 40 ⁇ m or more in the central portion 110) was reduced.
  • Example 2 As in Example 1, while the film 100 before stretching was heated and stretched, the film 100 before stretching did not break, and a stretched film excellent in quality was continuously produced. We were able to.
  • the produced unstretched film 100 has an average thickness t c of the central portion 110 of 158 ⁇ m and a minimum thickness t b of the boundary portion 110 of 110 ⁇ m, and the ratio of these thicknesses “t b / t c ”. was 0.70.
  • Comparative Example 1 in the prepared film 100 before stretching, the minimum thickness t b of the boundary portion 130 was too thin with respect to the average thickness t c of the central portion 110. Cracks occurred in the boundary portion 130 of the front film 100, the breakage of the pre-stretch film 100 occurred frequently, and the productivity of the stretched film was reduced.
  • the frequency of pre-stretching film 100 at the time of heat stretching is reduced by changing the temperature of the pre-tropical zone and the stretch zone during heat stretching from 140 ° C. to 150 ° C.
  • the obtained stretched film had a very small minimum thickness of about 8 ⁇ m in the portion corresponding to the boundary portion 130, the stress at the time of releasing the clip 310 from the stretched film after heat stretching. In addition, due to the stress when winding the obtained stretched film on a roll, a crack was generated in a portion corresponding to the boundary portion 130, and the stretched film was broken.
  • the ratio “t b / t c ” of the minimum thickness t b of the boundary portion 130 to the average thickness t c of the central portion 110 is 0.75 or more for the pre-stretch film 100 before performing the heat stretching.
  • the pre-stretched film 100 when the pre-stretched film 100 was heated and stretched, it was possible to suppress breakage of the pre-stretched film 100, so that it was possible to obtain a stretched film excellent in quality, and production of a stretched film It was possible to improve the performance.
  • the ratio “t b / t c ” of the minimum thickness t b of the boundary portion 130 to the average thickness t c of the central portion 110 is 0.75 for the unstretched film 100 before heat stretching.
  • Comparative Example 1 which was less than the above, during the heat stretching of the pre-stretched film 100, the pre-stretched film 100 was frequently broken, resulting in poor stretched film productivity.
  • Example 3 An acrylic resin (glass transition temperature Tg 1 : 123 ° C., elongation at break at room temperature: 5%) is prepared as the first thermoplastic resin PA for forming the central portion 110 of the film 100 before stretching, and the film before stretching As a second thermoplastic resin PC for forming both end portions 120 of 100, an acrylic resin (glass transition temperature Tg 2 : 125 ° C., elongation at break at room temperature: 7%) added with a small amount of rubber elastic particles is prepared. did.
  • the glass transition temperature is measured by differential scanning calorimetry (DSC), and the elongation at break at room temperature is measured by a tensile tester (Orientec Co., Ltd.). Manufactured, model number: RTC-1210A). The same applies to Example 4 and Comparative Example 2 below.
  • the prepared first thermoplastic resin PA and second thermoplastic resin PC are respectively supplied to the feed block 210 by a twin-screw extruder, and by the method shown in FIG. Was made.
  • the produced unstretched film 100 had an overall width of about 315 mm.
  • the average thickness t c of the central portion 110 is 160 .mu.m
  • the minimum thickness t b of the boundary portion 130 133Myuemu maximum thickness t e of the both end portions 120 in 270 ⁇ m
  • the thickness ratio “t b / t c ” was 0.83
  • “t e / t c ” was 1.69
  • “t s / t c ” was 5.0.
  • FIG. 14A, FIG. 14B and FIG. 14C described later the thickness corresponding to the position in the width direction of the unstretched film 100 is shown. As shown in FIG.
  • the boundary portion 130 of the unstretched film 100 was formed at a position of about 50 mm from the end portion in the width direction of the composite film 100.
  • an acrylic resin to which rubber elastic particles were added was used as the second thermoplastic resin PC.
  • the film 100 before stretching was melt-coextruded. It was possible to suppress the precipitation of rubber elastic particles during the process.
  • T-die 220 outlet width direction dimension 380mm Slit width t s of die slip 222: 0.8 mm Distance between T dice 220 and cooling roll 240: 60 mm
  • the obtained unstretched film 100 is gripped at both ends 120 by clips 310 and heated and stretched in the length direction and the width direction under the following conditions by the simultaneous biaxial stretching method as shown in FIG. Then, a stretched film was continuously obtained by winding with a roll.
  • the film 100 before stretching did not break while the film 100 before stretching was heated and stretched.
  • the thickness of the obtained stretched film was measured, the thickness of the portion corresponding to the boundary portion 130 was relatively thick as 30 ⁇ m or more, and the product effective width (region having a thickness of 40 ⁇ m or more in the central portion 110) was 450 mm. A stretched film secured relatively widely could be obtained. The results are shown in FIG.
  • Example 4 In making the pre-stretch film 100, except that was enlarged slit width t s of die lip 222 to 1.2mm, with the pre-stretch film 100 and a stretched film in the same manner as in Example 3, measuring the thickness did. The result of having measured thickness about the film 100 before extending
  • Example 4 the produced unstretched film 100 has an average thickness t c of the central portion 110 of 147 ⁇ m and a minimum thickness t b of the boundary portion 110 of 110 ⁇ m, and the ratio of these thicknesses “t b / t c ”. was 0.75.
  • Example 4 although compared with Example 3 mentioned above, as shown in FIG.14 (B), although the boundary part 130 of the film 100 before extending
  • thermoplastic resin PC for forming both end portions 120 of the unstretched film 100
  • an acrylic resin glass transition temperature Tg 2 : 125 ° C., elongation at break at room temperature: increased amount of rubber elastic particles added: Except for using 28%)
  • a film 100 before stretching and a stretched film were obtained in the same manner as in Example 3, and the thickness was measured.
  • stretching and a stretched film is shown in FIG.14 (C).
  • the produced unstretched film 100 has an average thickness t c of the central portion 110 of 155 ⁇ m and a minimum thickness t b of the boundary portion of 102 ⁇ m, and the ratio of these thicknesses “t b / t c ”. was 0.66.
  • the ratio “t b / t c ” of the minimum thickness t b of the boundary portion 130 to the average thickness t c of the central portion 110 was set to 0.75 or more.
  • Example 3 when the pre-stretched film 100 was heated and stretched, the pre-stretched film 100 could be prevented from being broken, so that a stretched film excellent in quality could be obtained. I was able to improve.
  • Example 3 with respect to the average thickness t c of the central portion 110, since the ratio "t s / t c" of the slit width t s of die lip 222 and 8.0 or less, as shown in FIG. 14 (A) Furthermore, the obtained stretched film had a uniform thickness and an excellent quality.
  • the ratio “t b / t c ” of the minimum thickness t b of the boundary portion 130 to the average thickness t c of the central portion 110 is less than 0.75 for the unstretched film 100 before heat stretching.
  • the film 100 before stretching was frequently broken during the heat stretching of the film 100 before stretching, and the productivity of the stretched film was inferior.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

L'invention concerne un procédé de production d'un film étiré, présentant une étape de formation d'un film de pré-étirage (100) à l'aide de cylindres (230, 240) pour refroidir/solidifier une résine thermoplastique extrudée en masse fondue depuis des filières de moulage (220) et une étape de formation d'un film étiré par chauffage/étirage du film de pré-étirage (100) dans au moins une direction. Selon l'invention, le procédé est caractérisé en ce que lors de l'étape de formation du film de pré-étirage (100), le film de pré-étirage (100) est formé de manière telle que le centre du film de pré-étirage (100) se contracte au moyen d'un étirage planaire et les deux bords se contractent au moyen d'un étirage à axe unique et, si l'épaisseur minimale de la limite formée entre le centre et les deux bords est tb et l'épaisseur moyenne du centre est tc, le rapport (tb/tc) de l'épaisseur minimale tb et de l'épaisseur moyenne tc vaut au moins 0,75.
PCT/JP2015/050670 2014-01-17 2015-01-13 Procédé de production d'un film étiré WO2015108036A1 (fr)

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JP2002052493A (ja) * 2000-08-09 2002-02-19 Kuraray Co Ltd エチレン−ビニルアルコール共重合体樹脂フィルムの製造方法
JP2007044924A (ja) * 2005-08-08 2007-02-22 Toyobo Co Ltd 熱可塑性樹脂シートの製造方法
JP2008149511A (ja) * 2006-12-15 2008-07-03 Toyo Kohan Co Ltd 延伸フィルムの製造方法
JP2009160900A (ja) * 2008-01-10 2009-07-23 Nitto Denko Corp 延伸フィルムの製造方法
JP2013006311A (ja) * 2011-06-23 2013-01-10 Teijin Dupont Films Japan Ltd フィードブロックおよび多層延伸フィルムの製造方法

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US5424025A (en) * 1993-05-03 1995-06-13 Minnesota Mining And Manufacturing Company Process of making zone orientated continuous web
JPH08207119A (ja) * 1994-10-19 1996-08-13 Diafoil Co Ltd 熱可塑性樹脂シート又はフイルムの製造方法
JPH11105131A (ja) 1997-10-07 1999-04-20 Toray Ind Inc 同時二軸延伸フィルムの製造方法
JP5434002B2 (ja) * 2007-08-07 2014-03-05 東レ株式会社 積層シートの製造装置および製造方法

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JP2002052493A (ja) * 2000-08-09 2002-02-19 Kuraray Co Ltd エチレン−ビニルアルコール共重合体樹脂フィルムの製造方法
JP2007044924A (ja) * 2005-08-08 2007-02-22 Toyobo Co Ltd 熱可塑性樹脂シートの製造方法
JP2008149511A (ja) * 2006-12-15 2008-07-03 Toyo Kohan Co Ltd 延伸フィルムの製造方法
JP2009160900A (ja) * 2008-01-10 2009-07-23 Nitto Denko Corp 延伸フィルムの製造方法
JP2013006311A (ja) * 2011-06-23 2013-01-10 Teijin Dupont Films Japan Ltd フィードブロックおよび多層延伸フィルムの製造方法

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