WO2015108037A1 - Procede de fabrication d'un film etire - Google Patents

Procede de fabrication d'un film etire Download PDF

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Publication number
WO2015108037A1
WO2015108037A1 PCT/JP2015/050671 JP2015050671W WO2015108037A1 WO 2015108037 A1 WO2015108037 A1 WO 2015108037A1 JP 2015050671 W JP2015050671 W JP 2015050671W WO 2015108037 A1 WO2015108037 A1 WO 2015108037A1
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WO
WIPO (PCT)
Prior art keywords
thermoplastic resin
composite film
stretching
film
stretched
Prior art date
Application number
PCT/JP2015/050671
Other languages
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.)
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Publication date
Application filed by 東洋鋼鈑株式会社 filed Critical 東洋鋼鈑株式会社
Priority to CN201580004808.XA priority Critical patent/CN105916655B/zh
Priority to KR1020167021807A priority patent/KR102251851B1/ko
Publication of WO2015108037A1 publication Critical patent/WO2015108037A1/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
    • 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.
  • 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.
  • Patent Document 1 a reinforcing film in which both end portions are formed at both ends in the width direction of the film by a thermoplastic resin having a larger stretching stress value at the time of heat stretching than the thermoplastic resin constituting the central portion of the film.
  • a technique for producing a stretched film by heat-stretching such a reinforcing film is disclosed.
  • the technique of Patent Document 1 is a glass of thermoplastic resin that constitutes the film center as a thermoplastic resin that constitutes both ends of the film.
  • a thermoplastic resin having a glass transition temperature higher than the transition temperature is used.
  • the difference in glass transition temperature between the thermoplastic resin constituting both ends of the film and the thermoplastic resin constituting the film center is too large (for example, the difference in glass transition temperature is 35 ° C. or more).
  • the present invention has been made in view of such a situation, and when producing a stretched film by heating and stretching while holding both ends of the film with a clip, it is possible to prevent the clip from coming off and the film from being broken.
  • An object of the present invention is to provide a method for producing a stretched film that can obtain a stretched film having excellent productivity and quality.
  • the present inventors form a first end and a second end on one end and the other end in the width direction of the film with a thermoplastic resin different from the thermoplastic resin constituting the central portion of the film, respectively.
  • a stretched film by heating and stretching such a composite film using a composite film
  • the cross section of the first end and the cross section of the second end of the cross section in the width direction of the composite film before heat stretching Has been found to be able to achieve the above-mentioned object by adjusting to satisfy a predetermined relationship, and the present invention has been completed.
  • the first thermoplastic resin and the second thermoplastic resin different from the first thermoplastic resin are melt-coextruded from a molding die and then cooled and solidified.
  • a composite film forming step of forming a composite film comprising a second end portion made of the second thermoplastic resin and gripping the composite film using a plurality of gripping members under heating conditions A stretched step of forming a stretched film by stretching the composite film at least in the length direction by pulling a gripping part in a stretched state, and producing the stretched film before the stretch Irumu sectional area of the first end portion of the cut surface in the width direction A 1 of [m 2], the cross-sectional area of the second end and A 2 [m 2], wherein the first end during heat-stretching And the gripping force of the first end and the second end by the gripping member is F [N], and the first end and the second end and the gripping member When the stretching stress value per unit cross-sectional area at the time of heat stretching of the second thermoplastic resin constituting the second end portion is ⁇ [N / m 2 ], the following formulas (1) and (2) A method for producing a stretched film is provided.
  • thermoplastic resin a thermoplastic resin having a higher stretching stress value per unit cross-sectional area at the time of heating and stretching than the first thermoplastic resin.
  • first end portion and the second end portion made of the second thermoplastic resin are formed.
  • thermoplastic resin such that the elongation at break during heat stretching is larger than the stretch ratio when performing heat stretching in the stretching step.
  • the heating temperature at the time of performing the heat stretching in the stretching step is lower than the glass transition temperature of the second thermoplastic resin.
  • the second thermoplastic resin is formed by adjusting a melt extrusion amount of the second thermoplastic resin with respect to a melt extrusion amount of the first thermoplastic resin by a molding die. it is preferable to control the size of the cross-sectional area a 2 of the sectional area a 1 and the second end of the first end portion of said composite film.
  • the manufacturing method of this invention has the removal process of removing a part of said 1st edge part and a part of said 2nd edge part in the said composite film formed by the said composite film formation process before the said extending
  • the first end made of the second thermoplastic resin. It is preferable to use a thermoplastic resin such that the elongation at break of the part and the second end portion at room temperature is larger than the break elongation at room temperature of the central portion made of the first thermoplastic resin.
  • the gripping position of each gripping member is a position within 10 mm of the distance from both ends of the central portion in the width direction.
  • the heat stretching of the composite film in the stretching step is performed by simultaneous biaxial stretching that extends in the width direction in addition to the length direction of the composite film.
  • the heat-stretching of the composite film in the stretching step is performed so that the thickness of the central portion after the heat-stretching of the composite film is in the range of 15 to 50 ⁇ m.
  • 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 composite film.
  • FIG. 2 is a diagram for explaining a method of stretching a composite film by a simultaneous biaxial stretching method in a stretching step.
  • FIG. 3 is a view for explaining a method of gripping the composite film with clips in the stretching step.
  • FIG. 4 is a diagram for explaining neck-in of the composite film when the composite film is heated and stretched.
  • FIG. 5 is a diagram illustrating an example of a method for trimming a composite film.
  • FIG. 6 is a graph showing the stretching stress value corresponding to the stretching ratio when the thermoplastic resins used in Examples and Comparative Examples are heated and stretched at 140 ° C.
  • FIG. 7 is a graph showing the results of measuring the thicknesses of the composite film and the stretched film prepared in Example 1.
  • FIG. 8 is a graph showing the results of measuring the thicknesses of the composite film and stretched film produced in Example 2.
  • FIG. 9 is a graph showing the results of measuring the thicknesses of the composite film and stretched film produced in Example 3.
  • FIG. 10 is a graph showing the results of measuring the thicknesses of the composite film and the stretched film produced in Example 4.
  • FIG. 11 is a graph showing the results of measuring the thicknesses of the composite film and the stretched film produced in Example 5.
  • the stretched film manufacturing method includes a first thermoplastic resin and a second thermoplastic resin different from the first thermoplastic resin by melt coextrusion using a molding T die.
  • the composite film forming step is a step of forming the composite film 100 by melt coextruding the first thermoplastic resin and the second thermoplastic resin from a T die.
  • FIG. 1 is a figure for demonstrating a composite film formation process.
  • the composite film 100 has a central portion 110, an end portion 120 a formed at one end in the width direction of the central portion 110, and the other end in the width direction of the central portion 110.
  • the end portion 120b is formed, the center portion 110 is made of a first thermoplastic resin, and the end portions 120a and 120b are made of a second thermoplastic resin.
  • the center part 110 of the composite film 100 is a part which becomes a stretched film by being heat-stretched by a stretching process described later.
  • the end portions 120a and 120b of the composite film 100 are for reinforcing the central portion 110 when the composite film 100 is heated and stretched, and are cut as necessary after the composite film 100 is heated and stretched. Can be removed.
  • thermoplastic resin and the second thermoplastic resin are supplied to the T dice 220 through the feed block 210 while being heated and melted.
  • the feed block 210 includes a first melt extruder (not shown) for melt-extruding the first thermoplastic resin and a second melt-extruding second thermoplastic resin. These melt extruders (not shown) 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 and the second thermoplastic resin are melt-extruded by the respective melt extruders at a temperature equal to or higher than the melting point (melting) temperature. Supply.
  • the composite film 100 obtained by the T dice 220 is formed as shown in FIG. 1st thermoplastic resin and 2nd thermoplastic resin so that it may become the structure by which the edge part 120a, 120b which consists of 2nd thermoplastic resin was formed in the both ends of the center part 110 which consists of 1 thermoplastic resin, respectively.
  • Supply resin
  • the feed block 210 has both sides in the widening direction of the T-die 220 with respect to the inlet for supplying the first thermoplastic resin and the inlet for supplying the first thermoplastic resin.
  • an inlet for supplying the second thermoplastic resin is separately provided.
  • the first thermoplastic resin and the second thermoplastic resin 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, the T dice 220 is formed.
  • the first thermoplastic resin flows in the central portion with respect to the widening direction of the first thermoplastic resin, flows out in such a manner that the second thermoplastic resin flows in both end portions of the first thermoplastic resin, and is supplied to the T dice 220. It is supposed to be.
  • the first thermoplastic resin and the second thermoplastic resin supplied from the feed block 210 are fed in the width direction (first thermoplastic resin by the manifold 221 provided in the T die 220. And in the direction in which the second thermoplastic resin is lined up), and thereby co-extruded from the die slip 222 into a sheet shape.
  • the co-extruded sheet-like first thermoplastic resin and second thermoplastic resin are continuously taken up by the touch roll 230 and the cooling roll 240 as shown in FIG.
  • the composite film 100 including the center portion 110 made of the first thermoplastic resin and the end portions 120a and 120b made of the second thermoplastic resin formed at both ends of the center portion 110 is produced.
  • the produced composite film 100 is wound up by a composite film winding roll (not shown), and thereby the composite film 100 can be obtained continuously.
  • the stretching process is a process in which the composite film 100 obtained by the composite film forming process is heated and stretched in the length direction and the width direction.
  • FIG. 2 is a figure for demonstrating an extending process.
  • the composite film 100 is fed out from the above-described composite film winding roll, and the length direction of the composite film 100 is gripped by the clip 310 as shown in FIG.
  • the composite film 100 is heated and stretched by a simultaneous biaxial stretching method in which stretching is performed simultaneously in the width direction.
  • the composite film 100 is continuously fed out from the composite film winding roll, and the ends 120a and 120b of the composite film 100 are held at regular intervals using a plurality of clips.
  • the composite film 100 is conveyed into the stretching furnace 320 by 310, and in the stretching furnace 320, the composite film 100 is stretched by being pulled in the length direction and the width direction by the respective clips 310.
  • the composite film 100 is conveyed while being held by the clip 310, so that the composite film 100 passes through the stretching furnace 320.
  • 100 is preheated to a temperature about 10 to 30 ° C. higher than the glass transition temperature of the first thermoplastic resin in the central portion 110 constituting this, and is then kept in the drawing zone in the drawing furnace 320.
  • the clip 310 is pulled in the length direction and the width direction as it is, and is stretched in the length direction and the width direction.
  • the heating temperature in the drawing furnace 320 is lower than the glass transition temperature of the second thermoplastic resin.
  • the stretchability of the end portions 120a and 120b made of the second thermoplastic resin can be appropriately reduced, and when the composite film 100 is heated and stretched, a neck-in (end of the composite film 100 described later) Phenomenon in which the portions 120a and 120b contract in the width direction) can be suppressed, and the productivity of the stretched film can be improved.
  • the stretched film can be obtained by cooling and solidifying the heat-stretched composite film 100 in the cooling heat fixing zone following the stretch zone in the stretching furnace 320. Then, the stretched film can be obtained continuously by opening the clip 310 and winding it with a roll.
  • the clip 310 that grips the end portions 120 a and 120 b of the composite film 100 includes a clip body 311, a lever 312 that can be turned around a pin 313, and a gripping portion. 314.
  • the position of the grip portion 314 is lowered by moving the lever 312 in the direction indicated by the arrow in FIG. 3 so that the composite film 100 can be gripped.
  • the portion on the inner side in the width direction from the grip position of the grip portion 314 at the end portions 120a and 120b is 10 mm or less.
  • the boundary portion between the central portion 110 and the end portion 120a or the boundary portion between the central portion 110 and the end portion 120b may be gripped by the grip portion 314 of the clip 310. That is, it is good also as an aspect which hold
  • a pair of guide rails for moving such a clip 310 is provided so as to pass through the drawing furnace 320.
  • the pair of guide rails are respectively installed at the position of the clip 310 that holds the end 120a of the composite film 100 and the position of the clip 310 that holds the end 120b shown in FIG. Are parallel to each other, are separated from each other in the width direction of the composite film 100 in the stretch band, and are 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 clip 310 that grips the end portion 120a of the composite film 100 and the clip 310 that grips the end portion 120b each move along such a guide rail, thereby transporting the composite film 100. And can be stretched.
  • the composite film 100 is stretched in the stretching zone in the stretching furnace 320 by using the clip 310 that moves along such a guide rail. That is, the clip 310 that grips the end portion 120a of the composite film 100 and the clip 310 that grips the end portion 120b are moved so as to spread in the width direction along the guide rails in the stretching band in the stretching furnace 320, respectively.
  • the end portions 120a and 120b of the composite film 100 are pulled in the length direction and the width direction as indicated by arrows in FIG.
  • the center part 110 and edge part 120a, 120b of the composite film 100 are heat-stretched in a length direction and a width direction until it becomes a required draw ratio, respectively.
  • the heat-stretched composite film 100 is cooled and solidified in a 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.
  • the stretched film and the composite film forming process can be integrated into a continuous line (process) to obtain a stretched film.
  • the composite film 100 including the central portion 110 made of the first thermoplastic resin and the end portions 120a and 120b made of the second thermoplastic resin in the composite film forming step.
  • a stretched film can be obtained by heating and stretching the central portion 110 and the end portions 120a and 120b of the composite film 100 through a stretching step.
  • the cross-sectional areas of the end portions 120a and 120b in the cross-section in the width direction of the composite film 100 before heat-stretching have a predetermined relationship. Adjust to meet the requirements.
  • the cross-sectional area of the end 120a is A 1 [m 2 ]
  • the cross-sectional area of the end 120b is A 2 [m 2 ]
  • the coefficient of static friction between the ends 120a, 120b and the clip 310 at the time of heating and stretching is ⁇
  • the gripping force (vertical load) of the ends 120a, 120b by the clip 310 is F [N]
  • the ends 120a when the stretching stress value per unit cross-sectional area at the time of heat stretching of the second thermoplastic resin constituting the 120b was ⁇ [N / m 2], the cross-sectional sectional area a 1 and the end portion 120b of the end portion 120a an area a 2, is adjusted so as to satisfy the following formula (1) and (2).
  • the above-described stretching stress value ⁇ indicates the tensile load necessary for heating and stretching the end portions 120a and 120b, and depends on the type of the second thermoplastic resin constituting the end portions 120a and 120b. It is a physical property value.
  • the heating and drawing the composite film 100 as the cross-sectional area A 1 and the cross-sectional area A 2 described above becomes smaller, or per unit sectional area of the second thermoplastic resin at the time of heat stretching As the stretching stress value ⁇ becomes smaller, the end portions 120a and 120b are easily stretched in the length direction, and thereby, the clip 310 is detached from the heat stretching and the composite film 100 is prevented from being broken. Further, when the composite film 100 is heated and stretched, the higher the static friction coefficient ⁇ between the ends 120a and 120b and the clip 310 and the gripping force (vertical load) F by the clip 310, the higher the ends 120a and 120b by the clip 310. Gripping becomes firm, and the clip 310 is prevented from coming off during heating and stretching.
  • the cross-sectional area A 2 of the sectional area A 1 and the end portion 120b of the end portion 120a described above the cross-sectional area A 1 and the cross-sectional area A 2, the stretching stress value ⁇ described above
  • the above formulas (1) and (2) in relation to the static friction coefficient ⁇ and the gripping force F it is possible to effectively prevent the clip 310 from being detached and the composite film 100 from being broken during the heat stretching. And the productivity of the stretched film can be improved.
  • ends 120a , 120b can be made of a thermoplastic resin having a higher glass transition temperature or the above-described stretching stress value ⁇ , thereby reducing the neck-in of the composite film 100 during heat stretching. It can suppress and can improve the productivity of the stretched film obtained.
  • the end portions 120a and 120b are contracted in the width direction between the clip 310 and the clip 310 as shown in FIG. A phenomenon called neck-in occurs.
  • the glass transition temperature and the above-described stretching stress value ⁇ are the same as those of the first thermoplastic resin constituting the central portion 110.
  • the end portions 120a and 120b are easily contracted in the width direction, and thus such neck-in occurs more remarkably.
  • the end portion 120a is obtained by using a thermoplastic resin having a relatively high glass transition temperature and the above-described stretching stress value ⁇ . , 120b is less likely to shrink in the width direction, and therefore, neck-in of the end portions 120a, 120b during heat stretching can be suppressed as shown in FIG.
  • variety to remove can be made small and it consists only of the center part 110 Since the thickness and orientation of the film can be uniform and wide, the quality and production yield of the film can be improved.
  • thermoplastic resin having a relatively high glass transition temperature or the above-described stretching stress value ⁇ is used as the second thermoplastic resin constituting the end portions 120a and 120b
  • the composite film 100 is heated and stretched.
  • the stretchability of the end portions 120a and 120b is lowered, the clip 310 that grips the end portions 120a and 120b is easily detached, and the end portions 120a and 120b are further torn and the composite film 100 is easily broken. It tends to become.
  • the second thermoplastic resin constituting the end portions 120a and 120b even when a thermoplastic resin having a high glass transition temperature or the above-described stretching stress value ⁇ is used, by adjusting the cross-sectional area a 2 of the sectional area a 1 and the end portion 120b of the end portion 120a so as to satisfy the relationship of the above formula (1) and (2), be easier to draw the ends 120a, and 120b Therefore, it is possible to appropriately prevent the clip 310 from coming off at the time of heat stretching and the breakage of the composite film 100, thereby reducing the productivity of the stretched film while suppressing the neck-in of the composite film 100 at the time of heat stretching. It can be improved effectively.
  • the cross-sectional area A 2 of the sectional area A 1 and the end portion 120b of the end portion 120a as a way to satisfy the above formula (1) and (2) is not particularly limited, for example, T die 220
  • the second thermoplastic resin is melt extruded by the T die 220 by adjusting the amount of the second thermoplastic resin supplied from the feed block 210 to the T die 220.
  • a method of adjusting the amount is mentioned.
  • a simple method of adjusting the melt extrusion amount of the second thermoplastic resin by T die 220 is possible to easily adjust the cross-sectional area A 1 and the cross-sectional area A 2 of the end portion 120b of the end portion 120a it can.
  • the cross-sectional area A 2 of the sectional area A 1 and the end portion 120b of the end portion 120a as a way to satisfy the above formula (1) and (2), after forming a composite film 100, the composite film A method of removing a part of the end portions 120a and 120b of 100 can also be used.
  • the composite film A method of removing a part of the end portions 120a and 120b of 100 can also be used. For example, as shown in FIG. 5, by trimming both ends of the produced composite film 100 with a cutter 250, a part of the end portions 120a and 120b can be cut and removed. This makes it possible in a simple method of trimming the composite film 100, easily, and accurately adjust the cross-sectional area A 2 of the sectional area A 1 and the end portion 120b of the end portion 120a.
  • the cutter 250 is not particularly limited.
  • a laser blade a rotary shear cutter that continuously rotates while rubbing a circular upper blade and a lower blade, and performs cutting by shearing
  • a solid laser a semiconductor laser
  • a laser cutter using a liquid laser or a gas laser can be used, the stress applied to the composite film 100 during trimming can be reduced, and the occurrence of cracks in the composite film 100 during trimming can be prevented. From this viewpoint, a laser cutter is preferable.
  • the side surfaces of the end portions 120a and 120b can be made smooth, and when the composite film 100 is heated and stretched, the side surfaces of the end portions 120a and 120b are roughened. It is possible to prevent the tearing of the end portions 120a and 120b due to the stress concentration on a part of the side surface, and to prevent the composite film 100 from being broken as a result.
  • the first thermoplastic resin for forming the central portion 110 may be selected according to the intended use of the stretched film.
  • acrylic resin (PMMA), annular An olefin copolymer (COC) or the like can be used.
  • the glass transition temperature and the stretching per unit cross-sectional area at the time of heat stretching are more than the first thermoplastic resin.
  • a thermoplastic resin having a high stress value ⁇ can be used.
  • thermoplastic resin having a relatively high glass transition temperature and the above-described stretching stress value ⁇ in the case of using the, by adjusting the cross-sectional area a 2 of the sectional area a 1 and the end portion 120b of the end portion 120a so as to satisfy the relationship of the above formula (1) and (2), the clip during heating and drawing Detachment 310 and breakage of the composite film 100 can be prevented appropriately. Therefore, according to the present embodiment, it is possible to use a thermoplastic resin having a relatively high glass transition temperature and the above-described stretching stress value ⁇ as the second thermoplastic resin. The neck-in of the film 100 can be appropriately suppressed.
  • the elongation at break at the time of heat stretching of the end portions 120a and 120b made of the second thermoplastic resin is the heat stretching in the stretching process described above. It is preferable to use a thermoplastic resin that is larger than the draw ratio when performing.
  • the said breaking elongation rate is a value which shows the elongation rate with respect to the dimension before extending
  • thermoplastic resin a thermoplastic resin is used in which the end portions 120a and 120b have higher elongation at break at room temperature than the center portion 110 of the obtained composite film 100 before heat stretching. It is preferable.
  • the elongation at break at normal temperature is a value indicating the elongation relative to the dimension before stretching when the center part 110 and the end parts 120a and 120b are stretched to break in a room temperature environment of about 10 to 30 ° C. .
  • thermoplastic resin based on the above-described viewpoint, specifically, the following thermoplastic resin can be used.
  • the second thermoplastic resin when an acrylic resin is used as the first thermoplastic resin, one kind of polycarbonate (PC), polyethylene naphthalate (PEN), cyclic olefin polymer (COP), and the like is used.
  • PC polycarbonate
  • PEN polyethylene naphthalate
  • COP cyclic olefin polymer
  • thermoplastic resin a resin obtained by adding a small amount of elastic rubber particles to the above-described first thermoplastic resin as long as the productivity of the stretched film is not impaired may be used.
  • the glass transition temperature is higher than that of the first thermoplastic resin, and the difference between the thermoplastic resin (heat-resistant thermoplastic resin) having a difference of more than 10 ° C.
  • a mixed resin obtained by blending a thermoplastic resin having a glass transition temperature lower than that of the thermoplastic resin (low temperature meltable thermoplastic resin) can be used.
  • thermoplastic resin 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. 2 as a method of heating and stretching the composite film 100, an example of using a simultaneous biaxial stretching method in which the composite film 100 is heated and stretched in both the length direction and the width direction is used. In this embodiment, a method of uniaxially stretching the composite film 100 only in the length direction may be used.
  • the heat stretching in the length direction of the composite film 100 can be performed in the same manner as the simultaneous biaxial stretching method shown in FIG.
  • the ends 120 a and 120 b of the composite film 100 are conveyed into the stretching furnace 320 while being gripped by the clip 310, and then the ends 120 a and 120 b of the composite film 100 are gripped 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 clips 310 in the width direction.
  • the end 120a of the composite film 100 is used as shown in FIG. 2 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.
  • 120b can be stretched while being gripped by the clip 310, so that the productivity of the stretched film can be improved as compared with the conventional sequential biaxial stretching method. It can be made excellent.
  • the conventional sequential biaxial stretching method is a method in which the composite 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 sequential biaxial stretching method the composite film 100 is heated and stretched in the length direction by being conveyed by a plurality of rolls, and then the ends 120a and 120b of the composite film 100 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 composite film 100 in the sequential biaxial stretching method is specifically performed as follows. That is, according to the sequential biaxial stretching method, the composite film 100 is preheated to about the glass transition temperature of the end portions 120a and 120b 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 end portions 120a and 120b by an infrared heater or the like, it is continuously conveyed by a cooling roll. At this time, by making the transport speed by the cooling roll faster than the transport speed by the pre-tropical roll, a tension is generated between the pre-tropical roll and the cooling roll, and the composite film 100 is formed using this tension. The film is stretched to the necessary stretching ratio in the length direction.
  • the sequential biaxial stretching method when the composite film 100 is stretched in the length direction, the surface of the composite film 100 comes into contact with the preheating roll and the cooling roll, so that the surface of the composite film 100 is scratched. May occur, and the appearance quality of the obtained stretched film may be deteriorated. Further, in the sequential biaxial stretching method, when the composite film 100 is heated and stretched in the length direction, the end portions 120a and 120b of the composite film 100 are not fixed with clips or the like. There is a concern that the stretched film may be reduced in productivity due to shrinkage in the direction.
  • the composite film 100 is stretched in the length direction by using the above-described simultaneous biaxial stretching method or the above-described method of uniaxial stretching only in the length direction.
  • FIG. 2 by using a method of stretching in the length direction while holding the ends 120 a and 120 b of the composite film 100 with the clip 310), contact with the roll is avoided. Therefore, scratches on the surface of the composite film 100 after heat stretching can be reduced.
  • external appearance quality can be improved and it uses suitably especially for an optical film etc. with a severe request
  • the composite film 100 when the composite film 100 is stretched in the length direction, the end portions 120a and 120b of the composite film 100 are held by the clip 310. The shrinkage of the film can be prevented, and the productivity of the stretched film can be improved.
  • Example 1 An acrylic resin (glass transition temperature Tg 1 : 123 ° C., elongation at break: 5%) is prepared as a first thermoplastic resin for forming the central portion 110 of the composite film 100, and the end of the composite film 100 is prepared.
  • Polycarbonate (PC) glass transition temperature Tg 2 : 143 ° C., elongation at break at room temperature: 170% was prepared as the second thermoplastic resin for forming the portions 120a and 120b.
  • the glass transition temperature is measured by differential scanning calorimetry (DSC), and the elongation at break at room temperature is a tensile tester (manufactured by Orientec Co., Ltd.). Model No .: RTC-1210A). The same applies to Examples 2 to 5 and Comparative Example 1 below.
  • the prepared first thermoplastic resin and second thermoplastic resin were respectively supplied to the feed block 210 by a twin screw extruder, and a composite film 100 was produced under the following conditions by the method shown in FIG. .
  • the produced composite film 100 was trimmed at both ends by 30 mm.
  • the overall width of the composite film 100 after trimming was 270 mm, of which the widths of the end portions 120 a and 120 b were 10 mm from both ends of the composite film 100.
  • the sectional area A 1 of the end portion 120a was 1.78 ⁇ 10 ⁇ 6 m 2
  • the sectional area A 2 of the end portion 120b was 1.79. ⁇ 10 ⁇ 6 m 2 .
  • T-die 220 outlet width direction dimension 380mm
  • the obtained composite film 100 is gripped by a clip 310 and, as shown in FIG. 2, is heated and stretched in the length direction and the width direction under the following conditions by a simultaneous biaxial stretching method, and then wound by a roll.
  • a stretched film was obtained continuously.
  • the stretching stress value ⁇ per unit cross-sectional area of the end portions 120a and 120b (second thermoplastic resin) at the time of heat stretching is 23.6 MPa (stretching stress of the end portions 120a and 120b shown in FIG. 6A).
  • the maximum value at a draw ratio of up to 100% In this example, while the composite film 100 was heated and stretched, the clip 310 was not detached and the composite film 100 was not broken.
  • Gripping force (vertical load) by clip 310 F 200N Coefficient of static friction ⁇ between the end portions 120a and 120b and the clip 310 at the time of heating and stretching: 0.40 Entry speed before heat drawing: 1 mpm Outlet speed after heating and stretching: 2 mpm Stretch ratio: 100% in length direction x 100% in width direction (twice in length direction x double in width direction)
  • Example 1 the calculated value of ⁇ F / ⁇ shown in the above formulas (1) and (2) could be calculated as 3.39 ⁇ 10 ⁇ 6 m 2 using the above-described value. Therefore, the above-described cross-sectional area A 1 (1.78 ⁇ 10 ⁇ 6 m 2 ) of the end 120a and the cross-sectional area A 2 (1.79 ⁇ 10 ⁇ 6 m 2 ) of the end 120b are both The value was smaller than ⁇ F / ⁇ .
  • FIGS. 7 (A) and 7 (B) show the distribution of thickness in the width direction.
  • FIG. 7A shows a measurement result of a cross section passing through the gripped portion by the clip 310.
  • FIG. 7 (A) 20 mm each of the both ends of the stretched film (region gripped by the clip 310) is not shown.
  • FIG. 7B shows a measurement result of a cross section passing between gripped portions by adjacent clips 310.
  • Example 1 the cross section passing through the gripping portion by the clip 310 has a width of the stretched film of 527 mm (a value obtained by adding 20 mm of both ends not shown to the width of the stretched film shown in FIG. 7A).
  • the cross-section passing between the gripping portions by the clip 310 has a stretched film width of 509 mm. Therefore, the neck-in width at the time of heat stretching is the difference between the widths of these stretched films.
  • Example 1 as shown in FIGS. 7A and 7B, the stretched film has a uniform thickness over the width of 460 mm at the center, and is excellent in quality. could get.
  • Example 2 As a second thermoplastic resin for forming the end portions 120a and 120b of the composite film 100, a mixed resin (glass) containing 15% by weight of polyethylene terephthalate (PET) with respect to 85% by weight of polycarbonate (PC). The transition temperature Tg 2 : 132 ° C., the elongation at break at room temperature: 40%), and the composite film 100 was changed in the same manner as in Example 1 except that the trimming width of the composite film 100 was changed to 5 mm from both ends. And the stretched film was obtained and the thickness was measured similarly. The results of measuring the thickness of the composite film 100 and the stretched film are shown in FIGS. 8 (A) and 8 (B). In FIG. 8A, the 20 mm area (the area gripped by the clip 310) at both ends of the stretched film is not shown. In Example 2, the measurement of the stretching stress value of the single film of the second thermoplastic resin was also performed. The results are shown in FIG.
  • Example 2 the produced composite film 100 had an overall width of 315 mm after trimming, and the widths of the end portions 120a and 120b were 30 mm from both ends of the composite film 100, respectively. Further, when the composite film 100 was cut in the width direction and the cut surface was observed, the cross-sectional area A 1 of the end portion 120a was 4.44 ⁇ 10 ⁇ 6 m 2 , and the cross-sectional area A 2 of the end portion 120b was 4.36. ⁇ 10 ⁇ 6 m 2 . Further, the stretching stress value ⁇ per unit cross-sectional area of the end portions 120a and 120b (second thermoplastic resin) at the time of heat stretching is 4.4 MPa (stretching stress of the end portions 120a and 120b shown in FIG. 6A). Among them, the maximum value at a draw ratio of up to 100%), and the coefficient of static friction ⁇ between the ends 120a and 120b and the clip 310 at the time of heat drawing was 0.45.
  • Example 2 the calculated value of ⁇ F / ⁇ shown in the above formulas (1) and (2) could be calculated as 20.45 ⁇ 10 ⁇ 6 m 2 using the above-described value. Therefore, the above-described cross-sectional area A 1 (4.44 ⁇ 10 ⁇ 6 m 2 ) of the end portion 120a and the cross-sectional area A 2 (4.36 ⁇ 10 ⁇ 6 m 2 ) of the end portion 120b are both The value was smaller than ⁇ F / ⁇ .
  • the cross section passing through the gripping portion by the clip 310 has a stretched film width of 624 mm (a value obtained by adding 20 mm each of the both ends, not shown, to the stretched film width shown in FIG. 8A).
  • the cross-section passing between the gripping portions by the clip 310 has a neck-in width ((624 mm-591 mm) at the time of heat stretching since the width of the stretched film was 591 mm. ) / 2) is a small value of 16.5 mm, which confirmed that neck-in was suppressed.
  • Example 2 while the composite film 100 was heated and stretched, the clip 310 was not detached and the composite film 100 was not broken.
  • Example 2 as shown in FIG. 8A, the portion passing through the grip portion by the clip 310 has a uniform thickness over the width of 505 mm at the center portion. ), The portion passing between the gripped portions by the clip 310 had a uniform thickness over a width of 500 mm, and thus a stretched film having excellent quality could be obtained.
  • Example 3 As the second thermoplastic resin for forming the end portions 120a and 120b of the composite film 100, a mixed resin (glass transition temperature Tg 2 :) obtained by mixing polycarbonate (PC) and acrylonitrile / butadiene / styrene (ABS). The composite film 100 and the stretched film were obtained in the same manner as in Example 1 except that the trimming width of the produced composite film 100 was changed to 10 mm each from both ends. Similarly, the thickness was measured. The results of measuring the thickness of the composite film 100 and the stretched film are shown in FIGS. 9 (A) and 9 (B). Note that in FIG. 9A, the 20 mm regions (regions held by the clips 310) at both ends of the stretched film are not shown. In Example 3, the stretching stress value of the single film of the second thermoplastic resin was also measured. The results are shown in FIG.
  • Example 3 the produced composite film 100 had an overall width of 257 mm after trimming, and the widths of the end portions 120a and 120b were 20 mm from both ends of the composite film 100, respectively.
  • the cross-sectional area A 1 of the end portion 120a is 3.59 ⁇ 10 -6 m 2
  • the cross-sectional area A 2 of the end portion 120b is 3.42 ⁇ 10 ⁇ 6 m 2 .
  • the stretching stress value ⁇ per unit cross-sectional area of the end portions 120a and 120b (second thermoplastic resin) at the time of heat stretching is 9.6 MPa (the stretching stress of the end portions 120a and 120b shown in FIG. 6A).
  • the coefficient of static friction ⁇ between the ends 120a and 120b and the clip 310 at the time of heat drawing was 0.22.
  • Example 3 the calculated value of ⁇ F / ⁇ shown in the above formulas (1) and (2) could be calculated as 4.58 ⁇ 10 ⁇ 6 m 2 using the above-described value. Therefore, the above-described cross-sectional area A 1 (3.59 ⁇ 10 ⁇ 6 m 2 ) of the end 120a and the cross-sectional area A 2 (3.42 ⁇ 10 ⁇ 6 m 2 ) of the end 120b are both The value was smaller than ⁇ F / ⁇ .
  • the cross-section passing through the gripping portion by the clip 310 has a width of the stretched film of 507 mm (the value obtained by adding 20 mm each of the both ends not shown to the stretched film width shown in FIG. 9A).
  • the cross section passing between the gripping portions by the clip 310 has a neck-in width ((507 mm ⁇ 487 mm) at the time of heat stretching because the stretched film has a width of 487 mm. ) / 2) is a small value of 10 mm, and this confirmed that neck-in was suppressed.
  • Example 3 the clip 310 was not detached and the composite film 100 was not broken while the composite film 100 was being heated and stretched.
  • Example 3 as shown in FIG. 9 (A), the thickness of the portion passing through the gripping portion by the clip 310 is uniform over the width of 450 mm. ), The portion passing between the gripped portions by the clip 310 had a uniform thickness over a width of 430 mm. Therefore, a stretched film excellent in quality could be obtained.
  • Example 4 As a second thermoplastic resin for forming the end portions 120a and 120b of the composite film 100, an acrylic resin (glass transition temperature Tg 2 : 125 ° C., elongation at break at room temperature: 8%) added with rubber elastic particles is used.
  • the composite film 100 and the stretched film were obtained in the same manner as in Example 1 except that the composite film 100 produced was not trimmed, and the thickness was measured in the same manner.
  • the results of measuring the thickness of the composite film 100 and the stretched film are shown in FIGS. 10 (A) and 10 (B). In FIG. 10A, the 20 mm regions (regions held by the clips 310) at both ends of the stretched film are not shown.
  • Example 4 the measurement of the stretching stress value of the single film of the second thermoplastic resin was also performed.
  • the results are shown in FIG.
  • FIG. 6B is a graph showing the measurement results of the stretching stress value of a single film produced using the first thermoplastic resin or the second thermoplastic resin, as in FIG. 6A.
  • the scale of the vertical axis is different from that in FIG.
  • Example 4 the produced composite film 100 had an overall width of 301 mm, and the widths of the end portions 120a and 120b were 35 mm from both ends of the composite film 100, respectively.
  • the cross-sectional area A 1 of the end portion 120a is 6.46 ⁇ 10 -6 m 2
  • the cross-sectional area A 2 of the end portion 120b is 5.99 ⁇ 10 ⁇ 6 m 2 .
  • the stretching stress value ⁇ per unit cross-sectional area of the end portions 120a and 120b (second thermoplastic resin) at the time of heat stretching is 1.78 MPa (the stretching stress of the end portions 120a and 120b shown in FIG. 6B).
  • the coefficient of static friction ⁇ between the end portions 120a and 120b and the clip 310 at the time of heat drawing was 0.32.
  • Example 4 the calculated value of ⁇ F / ⁇ shown in the above formulas (1) and (2) could be calculated as 35.96 ⁇ 10 ⁇ 6 m 2 using the above-described value. Therefore, the above-described cross-sectional area A 1 (6.46 ⁇ 10 ⁇ 6 m 2 ) of the end portion 120a and the cross-sectional area A 2 (5.99 ⁇ 10 ⁇ 6 m 2 ) of the end portion 120b are both The value was smaller than ⁇ F / ⁇ .
  • Example 4 while the composite film 100 was heated and stretched, the clip 310 was not detached and the composite film 100 was not broken.
  • the cross section passing through the gripping portion by the clip 310 has a stretched film width of 587 mm (the value obtained by adding 20 mm for each of the two ends, not shown, to the stretched film width shown in FIG. 10A).
  • the cross section passing between the gripping portions by the clip 310 had a neck-in width ((587 mm-521 mm) at the time of heat stretching because the stretched film had a width of 521 mm. ) / 2) was 33 mm, and the neck-in width was larger than in Examples 1 to 3 described above.
  • Example 5 As a second thermoplastic resin for forming the end portions 120a and 120b of the composite film 100, a mixed resin (glass) comprising 75% by weight of polycarbonate (PC) and 25% by weight of polyethylene terephthalate (PET).
  • the composite film 100 and the stretched film were obtained in the same manner as in Example 1 except that the transition temperature Tg 2 : 125 ° C. and the elongation at break at room temperature: 20% were used, and the produced composite film 100 was not trimmed. Similarly, the thickness was measured. The results of measuring the thickness of the composite film 100 and the stretched film are shown in FIGS. 11 (A) and 11 (B). In FIG. 11A, the 20 mm area (the area gripped by the clip 310) at both ends of the stretched film is not shown. In Example 5, the stretching stress value of the single film of the second thermoplastic resin was also measured. The results are shown in FIG.
  • Example 5 the produced composite film 100 had an overall width of 309 mm, of which the widths of the end portions 120a and 120b were 35 mm from both ends of the composite film 100, respectively.
  • the cross-sectional area A 1 of the end portion 120a is 2.47 ⁇ 10 -6 m 2
  • the cross-sectional area A 2 of the end portion 120b is 2.32 ⁇ 10 ⁇ 6 m 2 .
  • the stretching stress value ⁇ per unit cross-sectional area of the end portions 120a and 120b (second thermoplastic resin) at the time of heat stretching is 1.87 MPa (stretching stress of the end portions 120a and 120b shown in FIG. 6B).
  • the coefficient of static friction ⁇ between the ends 120a and 120b and the clip 310 at the time of heat drawing was 0.45.
  • Example 5 the calculated value of ⁇ F / ⁇ shown in the above formulas (1) and (2) could be calculated as 48.13 ⁇ 10 ⁇ 6 m 2 using the above-described value.
  • the above-described cross-sectional area A 1 (2.47 ⁇ 10 ⁇ 6 m 2 ) of the end portion 120a and the cross-sectional area A 2 (2.32 ⁇ 10 ⁇ 6 m 2 ) of the end portion 120b are both The value was smaller than ⁇ F / ⁇ .
  • Example 5 the clip 310 was not detached and the composite film 100 was not broken while the composite film 100 was heated and stretched.
  • the cross section passing through the gripping part by the clip 310 has a width of the stretched film of 603 mm (a value obtained by adding 20 mm of each of the both ends not shown to the stretched film width shown in FIG. 11A).
  • the cross section passing between the gripping portions by the clip 310 has a width of the stretched film of 544 mm, so that the neck-in width at the time of heat stretching ((603 mm-544 mm ) / 2) was 29.5 mm, and the neck-in width was larger than in Examples 1 to 3 described above.
  • the produced composite film 100 had end portions 120 a and 120 b having a width of 40 mm from both ends of the composite film 100.
  • the cross-sectional area A 1 of the end portion 120a is 12.04 ⁇ 10 -6 m 2
  • the cross-sectional area A 2 of the end portion 120b is 12.10 ⁇ 10 ⁇ 6 m 2 .
  • the stretching stress value ⁇ per unit cross-sectional area of the end portions 120a and 120b (second thermoplastic resin) at the time of heat stretching is 23.6 MPa
  • the end portions 120a and 120b and the clip 310 at the time of heat stretching
  • the coefficient of static friction ⁇ was 0.40.
  • the calculated value of ⁇ F / ⁇ shown in the above formulas (1) and (2) could be calculated as 3.39 ⁇ 10 ⁇ 6 m 2 using the above-described value.
  • the above-described cross-sectional area A 1 (12.04 ⁇ 10 ⁇ 6 m 2 ) of the end portion 120a and the cross-sectional area A 2 (12.10 ⁇ 10 ⁇ 6 m 2 ) of the end portion 120b are both The value was larger than ⁇ F / ⁇ .
  • Comparative Example 1 when the composite film 100 was stretched by heating, the composite film 100 was actually stretched in the length direction even though the stretch ratio in the length direction was set to 2 times. It was stretched only 1.6 times. This, at the time of heating and drawing, by the end cross-sectional area A 2 of the sectional area A 1 and the end portion 120b of 120a in the composite film 100 was too large, the end portion 120a, the stretchability 120b decreases, the composite film This is probably because the clip 310 that grips 100 has slipped. Further, when the film is stretched by heating, the clip 310 is detached and the composite film 100 is broken, and further, the portion of the composite film 100 that is not broken is also whitened by the pulling force of the clip 310, and the stretched film is appropriately formed. Cann't get.
  • the cross-sectional area A 2 of the sectional area A 1 and the end portion 120b of the end portion 120a in the composite film 100 before the heat stretching is reduced shall meet the relationship of the above formula (1) and (2)
  • heat stretching can be performed using a thermoplastic resin having a relatively high glass transition temperature as the second thermoplastic resin, and the neck-in width of the composite film 100 during heat stretching is reduced. We were able to.
  • the cross-sectional area A 2 is larger cross-sectional area A 1 and the end portion 120b of the end portion 120a in the composite film 100 before heat stretching, did not meet the relation of the above-mentioned formula (1) and (2)
  • Comparative Example 1 when the composite film 100 is heated and stretched, the clip 310 slips and cannot be properly heated and stretched. Further, the clip 310 is detached and the composite film 100 is broken. The productivity was inferior.

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Abstract

L'invention se réfère à un procédé de fabrication d'un film étiré dans lequel, lors de la fabrication d'un film étiré par l'étirage à chaud d'un film composite (100) dans au moins une direction, lequel est obtenu par la formation respective, sur un bord et l'autre bord d'un film dans la direction de la largeur, d'un premier bord et d'un second bord à partir d'une résine thermoplastique, qui diffère de la résine thermoplastique constituant la partie centrale du film, par extrusion de matière fondue à partie d'un moule de formage (220), les formules suivantes (1) et (2) sont satisfaites lorsque, s'agissant de parties coupées dans la direction de la largeur du film composite (100) avant étirage à chaud, la section transversale du premier bord est représentée par A1 [m2] et la section transversale du second bord est représentée par A2 [m2], le coefficient de frottement statique entre le premier bord et le second bord et les éléments de préhension pendant l'étirage à chaud étant représenté par µ, la force de préhension du premier bord et du second bord par les éléments de préhension étant représentée par F [N], et la contrainte d'étirage par unité de surface en section de la seconde résine thermoplastique pendant l'étirage à chaud étant représentée par σ [N/m2]. A1 < µF/σ --- (1) A2 < µF/σ --- (2)
PCT/JP2015/050671 2014-01-17 2015-01-13 Procede de fabrication d'un film etire WO2015108037A1 (fr)

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CN113147012B (zh) * 2021-03-09 2022-09-02 复旦大学 聚四氟乙烯膜及其制备方法

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CN105916655B (zh) 2017-07-25
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JP2015134454A (ja) 2015-07-27
KR102251851B1 (ko) 2021-05-12
CN105916655A (zh) 2016-08-31

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