WO2022091815A1 - Film continu et son procédé de production - Google Patents

Film continu et son procédé de production Download PDF

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Publication number
WO2022091815A1
WO2022091815A1 PCT/JP2021/038182 JP2021038182W WO2022091815A1 WO 2022091815 A1 WO2022091815 A1 WO 2022091815A1 JP 2021038182 W JP2021038182 W JP 2021038182W WO 2022091815 A1 WO2022091815 A1 WO 2022091815A1
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WIPO (PCT)
Prior art keywords
film
point
convex portion
knurled
linear convex
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Application number
PCT/JP2021/038182
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English (en)
Japanese (ja)
Inventor
祐哉 平野
Original Assignee
日本ゼオン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本ゼオン株式会社 filed Critical 日本ゼオン株式会社
Priority to CN202180071308.3A priority Critical patent/CN116419940A/zh
Priority to KR1020237012443A priority patent/KR20230095068A/ko
Priority to JP2022559012A priority patent/JPWO2022091815A1/ja
Publication of WO2022091815A1 publication Critical patent/WO2022091815A1/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
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/16—Surface shaping of articles, e.g. embossing; Apparatus therefor by wave energy or particle radiation, e.g. infrared heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H18/00—Winding webs
    • B65H18/28—Wound package of webs
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances

Definitions

  • the present invention relates to a long film having a knurled portion and a method for producing the same.
  • films such as optical films have been manufactured as long long films from the viewpoint of achieving high productivity.
  • the film since the film is generally thin, it may be inferior in handleability. Therefore, conventionally, it has been proposed to form a plurality of knurled portions including convex portions at the end portions in the width direction of the film so as to be lined up in the longitudinal direction to improve the handleability of the film (Patent Document 1 and). 2).
  • the long film is generally transported in the longitudinal direction, subjected to various treatments, and then wound into a roll and shipped.
  • an air layer may be formed between the rolled long films.
  • the long films may support each other in the knurled portion, and an air layer may be formed in the portion other than the knurled portion. In the area where this air layer is located, the rolled long films can be non-contact with each other.
  • the long films may come into contact with each other and their surfaces may adhere to each other.
  • the phenomenon in which the surfaces of the long films overlapped in the roll adhere to each other in the roll is sometimes called "blocking".
  • rolls may be stored with their axial orientation horizontal. In this case, the roll is stressed to be compressed in the axial direction due to the weight of the roll. When the roll shape is deformed by this stress and a portion where the air layer is locally thin is generated, blocking may occur in that portion.
  • buckling of a roll refers to a depression formed by a partial radial recess of the roll. This buckling is likely to occur in a portion where the air layer between the long films that are rolled up is thick. Then, in the portion where this buckling occurs, the long film may be deformed and wrinkles may be formed.
  • the convex portion of the conventional knurl portion was generally formed in a dot shape when viewed from the thickness direction.
  • the convex portion has a dot shape, the area of the portion where the long films wound on each other support each other is small. Therefore, it may not be possible to stably resist the stress that tends to be compressed in the axial direction, and it may not be possible to suppress the occurrence of blocking and wrinkles.
  • the present inventor tried to form the convex portion of the knurled portion into a linear shape non-parallel to the longitudinal direction of the film when viewed from the film thickness direction.
  • the convex portion is formed in a linear shape
  • the long films can support each other in a portion having a wider area than the dot shape. Therefore, the long films can resist the stress to be compressed in the axial direction with a large frictional force, and the deformation can be suppressed. Therefore, it has become possible to stably suppress the occurrence of blocking and wrinkles.
  • the conventional knurl portion is generally formed by pressing with a pressing tool such as a pressing roll having an uneven surface.
  • a large stress tends to remain in the convex portion of the knurl portion formed by pressing. Therefore, the height of the convex portion may change with time due to the relaxation of the stress (stress remaining on the convex portion). When the height of the convex portion changes with time, blocking and wrinkles are likely to occur over time.
  • the present inventor has focused on a method of forming a knurled portion by laser light or inkjet printing.
  • the material heated by the laser light is fluidized and deformed to form a convex portion.
  • a convex portion can be formed without using a mechanical force such as a pressing force. Therefore, usually, a large stress does not remain in the convex portion.
  • the printed ink can be deposited to form a convex portion. Since the convex portion is formed by the deposition of ink, no mechanical force such as pressing force is required to form the convex portion. Therefore, usually, a large stress does not remain in the convex portion. Therefore, the height of the convex portion formed by laser light or inkjet printing is suppressed from changing with time.
  • the drawing point is linearly moved on the long film to form a knurled portion including a linear convex portion.
  • the drawing point represents a point where the device for forming the knurled portion forms the convex portion.
  • the drawing point represents a point where the laser light hits the film.
  • the drawing point represents a point where the ink hits the film.
  • the convex portion of the knurled portion formed linearly may have a locally different height at a certain position in the film width direction. .. That is, at a certain position in the film width direction, a portion that is locally raised or lowered may occur in the convex portion.
  • the portions having locally different heights overlap each other, so that the above-mentioned local difference in height is amplified. Therefore, when the locally high portions overlap each other, the long films abut against each other at a large pressure in the portion, while the pressure at which the long films abut each other in the other portions may be weakened.
  • the pressure at which the long films come into contact with each other in the portions can be weakened. Therefore, the long films could not support each other with uniform pressure in a large area, and the ability to suppress the generation of blocking and wrinkles could be reduced.
  • the present invention has been devised in view of the above problems, and an object of the present invention is to provide a long film having excellent ability to suppress the generation of blocking and wrinkles when wound into a roll, and a method for producing the same. ..
  • the present inventor may make the convex portion higher or lower at the start point or the end point of the formation of the convex portion in the portion where the height of the convex portion is locally different. I found that it was caused by doing. Then, the present inventor disperses both the positions of the start point and the end point in the film width direction to prevent the parts having locally different heights from overlapping with each other, and to make the portion longer in a wide area. It has been found that the above-mentioned problems can be solved because the scale films can support each other. Based on the above findings, the present inventor has completed the present invention. That is, the present invention includes the following.
  • the knurled portions are formed side by side in the longitudinal direction of the film.
  • a long film in which at least one of the highest point and the lowest point of the convex portion of each of the knurled portions is dispersed in the film width direction.
  • the knurled portion includes a concave portion and the convex portions provided on both sides of the concave portion.
  • the long film according to [1] wherein the long film includes a base film layer and the convex portion attached to the surface of the base film layer.
  • the present invention it is possible to provide a long film having an excellent ability to suppress the generation of blocking and wrinkles when wound into a roll, and a method for producing the same.
  • FIG. 1 is a plan view schematically showing a state of a long film according to the first embodiment of the present invention as viewed from the thickness direction of the long film.
  • FIG. 2 is a plan view schematically showing a planar shape of one of the knurled portions of the long film according to the first embodiment of the present invention as viewed from the thickness direction of the long film.
  • FIG. 3 schematically shows a cross section of a linear convex portion included in a knurl portion included in a long film according to the first embodiment of the present invention, cut along a plane perpendicular to the extending direction of the linear convex portion. It is sectional drawing which shows.
  • FIG. 1 is a plan view schematically showing a state of a long film according to the first embodiment of the present invention as viewed from the thickness direction of the long film.
  • FIG. 2 is a plan view schematically showing a planar shape of one of the knurled portions of the long film according to the first embodiment of the present invention as viewed
  • FIG. 4 is a graph showing the energy of the laser beam used for forming the linear convex portion according to the example.
  • FIG. 5 is a plan view schematically showing how the irradiation point P of the laser beam irradiated to form the linear convex portion moves.
  • FIG. 6 is a plan view schematically showing a state in which the vicinity of the end portion of the long film according to the first embodiment of the present invention in the film width direction is viewed from the thickness direction of the long film.
  • FIG. 7 is an enlarged plan view schematically showing the periphery of the portion where the knurled portion is formed on the surface of the untreated film.
  • FIG. 8 is an enlarged plan view schematically showing the periphery of the portion where the knurled portion is formed on the surface of the untreated film.
  • FIG. 9 is an enlarged plan view schematically showing the periphery of the portion where the knurled portion is formed on the surface of the untreated film.
  • FIG. 10 is a plan view schematically showing a plan shape of one of the knurled portions according to the modified example of the first embodiment as viewed from the thickness direction.
  • FIG. 11 is a plan view schematically showing a plan shape of one of the knurled portions according to the modified example of the first embodiment as viewed from the thickness direction.
  • FIG. 12 is a plan view schematically showing a state in which the vicinity of the end portion of the long film according to the modified example of the first embodiment in the film width direction is viewed from the thickness direction of the long film.
  • FIG. 13 is a plan view schematically showing a state in which the vicinity of the end portion of the long film according to the modified example of the first embodiment in the film width direction is viewed from the thickness direction of the long film.
  • FIG. 14 is a plan view schematically showing a state in which the vicinity of the end portion of the long film according to the modified example of the first embodiment in the film width direction is viewed from the thickness direction of the long film.
  • FIG. 15 is a plan view schematically showing a state of a long film according to a second embodiment of the present invention as viewed from the thickness direction of the long film.
  • FIG. 16 is a plan view schematically showing a planar shape of one of the knurled portions of the long film according to the second embodiment of the present invention as viewed from the thickness direction of the long film.
  • FIG. 17 schematically shows a cross section of a linear convex portion included in a knurl portion included in a long film according to a second embodiment of the present invention, cut along a plane perpendicular to the extending direction of the linear convex portion. It is sectional drawing which shows.
  • the "long" film means a film having a length of 5 times or more with respect to the width, preferably a film having a length of 10 times or more, and specifically, a roll.
  • the upper limit of the length of the long film is not particularly limited, and may be, for example, 100,000 times or less with respect to the width.
  • planar shape of the element of the film represents the shape of the element as seen from the thickness direction of the film, unless otherwise specified.
  • the "thickness direction” indicates the thickness direction of the film unless otherwise specified.
  • the dispersion of a plurality of points in the film width direction may be described.
  • one edge in the film width direction of a long film is used as a reference
  • these points are usually the film width. Not dispersed in the direction.
  • these points are usually dispersed in the film width direction.
  • (meth) acrylic is a term that includes “acrylic”, “methacrylic” and combinations thereof
  • (meth) acrylate is “acrylate”
  • FIG. 1 is a plan view schematically showing a state of the long film 10 according to the first embodiment of the present invention as viewed from the thickness direction of the long film 10.
  • the long film 10 according to the first embodiment of the present invention is a long film and has a plurality of knurled portions 100 on at least one surface 10U. These plurality of knurled portions 100 are formed side by side in the film longitudinal direction MD of the long film 10. Further, the knurl portion 100 is usually provided at at least one end of the long film 10 in the film width direction TD, and is preferably provided at both ends.
  • Each knurl portion 100 includes a convex portion 110 having a continuous linear shape when viewed from the thickness direction.
  • this linear convex portion 110 may be referred to as a “linear convex portion” 110.
  • the planar shape of each knurl portion 100 as viewed from the film thickness direction may be the same or different. Therefore, the planar shape of the linear convex portion 110 seen from the film thickness direction may be the same or different. In this embodiment, an example is shown in which the planar shapes of the knurled portion 100 and the linear convex portion 110 are the same.
  • FIG. 2 is a plan view schematically showing a plan shape of one of the knurled portions 100 included in the long film 10 according to the first embodiment of the present invention as viewed from the thickness direction of the long film 10.
  • the knurled portion 100 includes a continuous linear convex portion 110.
  • the linear convex portion 110 extends non-parallel to the film longitudinal direction MD. Therefore, the linear convex portion 110 is not formed at only one place in the film width direction TD, but is formed over a specific range.
  • the width of the range in which the linear convex portion 110 is formed in this way can correspond to the width LTD of each knurled portion 100.
  • the linear convex portion 110 is usually formed as a continuous line in a single stroke as a trace of movement of the irradiation point (corresponding to a drawing point) of the laser beam. Has been done.
  • the knurled portion 100 has a specific planar shape drawn by such a linear convex portion 110.
  • FIG. 3 is a cross section of a linear convex portion 110 included in the knurled portion 100 of the long film 10 according to the first embodiment of the present invention, cut along a plane perpendicular to the extending direction of the linear convex portion 110. It is sectional drawing which shows typically.
  • the knurled portion 100 according to the present embodiment includes a concave portion 120 and linear convex portions 110 provided on both sides of the concave portion 120.
  • the concave portion 120 corresponds to a portion from which the resin has been removed by thermal melting or ablation due to irradiation with laser light
  • the linear convex portion 110 is a resin heated and fluidized by irradiation with the laser light. Corresponds to the raised part. Since the linear convex portion 110 protrudes from the surface 10U of the surrounding long film 10, the substantially thickness of the long film 10 becomes thicker in the knurled portion 100 including the linear convex portion 110. There is.
  • the height H of the linear convex portion 110 is not constant in the extending direction of the linear convex portion 110. Therefore, the linear convex portion 110 included in each knurl portion 100 includes one or both of the highest point and the lowest point.
  • the highest point of the linear convex portion 110 included in a certain Nar portion 100 represents a point where the height H of the linear convex portion 110 is the highest point in the linear convex portion 110.
  • the lowest point of the linear convex portion 110 included in a certain Nar portion 100 represents a point where the height H of the linear convex portion 110 is the lowest in the linear convex portion 110. Therefore, the height H of the linear convex portion 110 included in a certain knurl portion 100 can be the highest at the highest point and the lowest at the lowest point in the extending direction of the linear convex portion 110.
  • One or both of the highest point and the lowest point may be formed at the start point or the end point of the formation of the linear convex portion 110 by the laser beam.
  • a mechanism in which the highest point or the lowest point of the linear convex portion 110 is formed by irradiation with laser light will be described.
  • the mechanism described below is an example, and the mechanism for forming the highest point and the lowest point is not limited to these examples.
  • FIG. 4 is a graph showing the energy of the laser beam used for forming the linear convex portion 110 according to the example.
  • the horizontal axis represents time and the vertical axis represents the energy of laser light.
  • a laser oscillator as a light source of laser light increases the energy of the laser light in the laser oscillator, opens the shutter, and emits the laser light. At this time, immediately after the shutter is released, as shown in FIG. 4, light in a high energy state in the laser oscillator can be temporarily taken out.
  • the starting point of the formation of the linear convex portion 110 may be irradiated with a laser beam having an energy E 0 higher than the stabilized energy ES irradiated after the starting point.
  • a laser beam having such a high energy E0 is irradiated, a large amount of resin is heated and fluidized at the starting point irradiated with the laser beam, and a high linear convex portion 110 can be formed.
  • the reflection mirror In general, in order to move the irradiation point of the laser beam, the reflection mirror is moved by a driving device such as a galvano motor to adjust the angle of the reflection mirror.
  • a driving device such as a galvano motor to adjust the angle of the reflection mirror.
  • the reflection mirror that was in the stopped state is moved.
  • the laser beam hits the starting point for a long time by the amount of time required. Therefore, since a large amount of resin is heated and fluidized at the starting point, a high linear convex portion 110 can also be formed.
  • FIG. 5 is a plan view schematically showing how the irradiation point P of the laser beam irradiated to form the linear convex portion 110 moves.
  • the laser beam first hits the starting point 110S. After that, laser light irradiation is performed while moving the irradiation point P as shown by the arrow A1, and a linear convex portion 110 (not shown in FIG. 5) is formed as a trace of the movement of the irradiation point P. ..
  • the laser beam hits a point where the linear convex portion 110 is formed after the start point 110S (specifically, a point at the intermediate portion 110M described later) for a relatively long time. Specifically, it takes a relatively long time from the time when the irradiation point P reaches the point to the time when the irradiation point P leaves the point.
  • the start point 110S may be exposed to the laser beam for a relatively short time.
  • the laser beam does not hit the leftmost portion VS of the start point 110S as soon as the irradiation point P starts to move, the irradiation time of the laser beam is particularly short.
  • the irradiation time of the laser beam is short as described above, the amount of the resin fluidized by the heating by the laser beam is reduced, so that the low linear convex portion 110 can be formed.
  • the energy of the laser light may be high at the center of the irradiation point P, and the energy of the laser light may be low at the outer edge of the irradiation point P.
  • the portion VS corresponding to the outer edge portion of the irradiation point P is given only particularly low energy by the laser beam, so that the height of the linear convex portion 110 at this portion VS is high. H tends to be particularly low.
  • the reflection mirror is moved by a driving device to adjust the angle of the reflection mirror.
  • the reflection mirror in the operating state is stopped.
  • the operation of the reflection mirror it takes time to stop the reflection mirror against the inertial force.
  • the laser beam hits the end point 110E of the formation of the linear convex portion 110 for a long time by the time required. Therefore, at the end point 110E, a large amount of resin is heated and fluidized, which can form a high linear convex portion 110.
  • the lowest point of the linear convex portion 110 is formed at the end point 110E of the formation of the linear convex portion 110 by the laser beam.
  • the irradiation point P is moved as shown by the arrow A1 and the irradiation of the laser beam is performed to form the linear convex portion 110 (not shown in FIG. 5), as described above.
  • the laser beam hits a point where the linear convex portion 110 is formed before the end point 110E of the linear convex portion 110 (specifically, a point at the intermediate portion 110M described later) for a relatively long time.
  • the end point 110E may be exposed to the laser beam for a relatively short period of time.
  • the irradiation time of the laser beam is particularly short.
  • the amount of the resin fluidized by the heating by the laser beam is reduced, so that the low linear convex portion 110 can be formed.
  • the portion VE corresponding to the outer edge portion of the irradiation point P is used, the portion VE corresponding to the outer edge portion of the irradiation point P. Since only low energy is given to the laser beam, the height H of the linear convex portion 110 at this portion VE tends to be particularly low.
  • the output of the laser light may decrease with the passage of time after the shutter of the laser oscillator is opened.
  • the above-mentioned decrease in output may occur due to factors such as changes in the excited state and temperature of the gas in the laser oscillator due to the opening of the shutter.
  • the amount of resin fluidized by heating with laser light is reduced, so that a low linear convex portion 110 can be formed.
  • the highest point or the lowest point of the linear convex portion 110 can be formed at the start point and the end point of the formation of the linear convex portion 110 by the laser beam. Whether the highest point and the lowest point of the linear convex portion 110 are formed at the start point or the end point may depend on the formation conditions of the linear convex portion 110. Further, for example, when the start point and the end point are at the same point, the linear convex portion 110 may have only one of the highest point and the lowest point.
  • the start point and the end point were not dispersed in the film width direction TD and were usually set at a fixed position. Therefore, in the past, the highest point and the lowest point of the linear convex portion were not dispersed in the film width direction TD, and were usually at a fixed position.
  • the points such as the start point, the end point, the highest point, and the lowest point are not dispersed in the film width direction, the directions perpendicular to both the film width direction TD and the film thickness direction from each of these points (in the example of the present embodiment).
  • the distance to the reference line extending in the film longitudinal direction MD was usually uniform at all points.
  • the reference line does not need to be actually drawn and may be a virtual straight line, but for example, one edge of the long film in the film width direction TD may be adopted.
  • the distance from each of the plurality of points not dispersed in the film width direction TD to the edge of the long film as described above is usually the same for all points. there were. Therefore, when the long films are rolled up, the highest points of the rolled up long films overlap each other, and as a result, the local height of the highest points may be amplified. Further, when the long films were rolled up, the lowest points of the rolled up long films overlapped with each other, and as a result, the local lowness of the lowest points was sometimes amplified. In any of these cases, in the film width direction TD, the wound long films can support each other only by a part of the knurled portion, so that blocking and wrinkling are conventionally suppressed. It could be inferior in ability.
  • the highest point and the lowest point of the linear convex portion 110 of each of the knurled portions 100 is dispersed in the film width direction TD.
  • the highest point and the lowest point of the linear convex portion 110 may be formed at the start point or the end point of the formation of the linear convex portion 110. Therefore, in the long film 10 having the knurled portion 100 including the linear convex portion 110 in which at least one of the positions of the highest point and the lowest point is dispersed, both the positions of the start point and the end point are dispersed in the film width direction TD. Can be obtained.
  • the dispersion of the highest point 110H from each of the plurality of highest points 110H to the edge of the long film 10.
  • the distance is not uniform for all highest points 110H and there can be more than one variation.
  • the mode of this dispersion can be the same not only for the highest point 110H but also for the lowest point, the start point and the end point.
  • FIG. 6 is a plan view schematically showing a state in which the vicinity of the end portion of the long film 10 according to the first embodiment of the present invention in the film width direction TD is viewed from the thickness direction of the long film 10.
  • a group of knurled portions 100 formed side by side in the film longitudinal direction MD on the long film 10 according to the example shown in the present embodiment have linear convex portions at different positions in the film width direction TD. It has a maximum point of 110, 110H. Therefore, the highest points 110H are dispersedly provided at a plurality of positions (here, four places) in the film width direction TD.
  • the maximum points 110H are dispersedly provided in the film width direction TD in this way, the maximum points 110H of the long films 10 wound and overlapped in the roll are concentrated and overlapped at one position of the film width direction TD. Instead, they are distributed and overlapped in multiple different positions. Therefore, the uniformity of the substantially thickness of the portion provided with the knurled portion 100 (in the present embodiment, the end portion of the long film 10) is improved as the entire roll. Therefore, since the long films 10 can support each other with uniform pressure in a wide area corresponding to the entire width LTD of the knurled portion 100, the ability to suppress the generation of blocking and wrinkles is improved. Can be done.
  • the distance D 110H between the highest points 110H dispersedly provided in the film width direction TD is 0.01 ⁇ L with respect to the width L TD of the knurled portion 100 including the linear convex portion 110 having the highest point 110H. It is preferably TD or more and 0.5 ⁇ L TD or less.
  • the distance D 110H between the highest points 110H is within the above range, the ability to effectively enhance the substantially uniformity of the thickness of the portion provided with the knurl portion 100 and suppress the generation of blocking and wrinkles is effective. Can be enhanced to.
  • the interval D 110H may be different, but is preferably uniform from the viewpoint of particularly effectively suppressing the generation of blocking and wrinkles.
  • the linear convex portion 110 included in the knurled portion 100 preferably has a planar shape having the corner portions 111.
  • the number of the square portions 111 that the linear convex portion 110 of one knurl portion 100 has in its planar shape may be 1, but preferably 2 or more.
  • the angle ⁇ of these corners is preferably 80 ° or more, more preferably 85 ° or more, particularly preferably 88 ° or more, and preferably 100 ° or less, more preferably 95 ° or less, particularly preferably. Is in the range of 92 ° or less.
  • a linear convex portion 110 having a zigzag planar shape including a plurality of corner portions 111 and a plurality of straight portions 112 connecting the corner portions 111 will be described as an example.
  • the planar shape of the linear convex portion 110 may be an endless shape. Specifically, since the linear convex portion 110 is continuously formed in an annular shape when viewed from the thickness direction, the linear convex portion 110 may have an endless shape. When the linear convex portion 110 having an endless shape is formed by laser light as described above, the start point and the end point of the formation of the linear convex portion 110 can be set at the same point as in the example shown in the present embodiment.
  • / L MD is preferably within a predetermined range.
  • the ratio LTD / LMD is preferably 2 or more, more preferably 2.5 or more, and particularly preferably 3 or more.
  • the upper limit of the ratio L TD / L MD is not particularly limited, but is preferably 15 or less, more preferably 13 or less, and particularly preferably 10 or less.
  • the width L TD of the knurled portion 100 represents the distance in the range in which the linear convex portion 110 is formed in the film width direction TD. Further, the length L MD of the knurled portion 100 represents the distance in the range in which the linear convex portion 110 is formed in the MD in the longitudinal direction of the film.
  • the width L TD and the length L MD of the knurl portion 100 are appropriately set so that the above-mentioned ratio L TD / LM is within the above-mentioned range, respectively.
  • the width LTD per one of the knurled portions 100 in the film width direction TD is preferably 3 mm or more, more preferably 5 mm or more, particularly preferably 7 mm or more, preferably 20 mm or less, more preferably 20 mm or less. It is 17 mm or less, particularly preferably 15 mm or less.
  • the length LMD per one of the knurled portions 100 in the film longitudinal direction MD is preferably 0.1 mm or more, more preferably 0.5 mm or more, particularly preferably 1 mm or more, preferably 20 mm or less, and more. It is preferably 15 mm or less, and particularly preferably 10 mm or less.
  • the knurled portions 100 are usually provided side by side in the longitudinal direction MD of the long film 10 at a specific pitch.
  • the pitch of the knurled portion 100 is preferably 0.5 mm or more, more preferably 1 mm or more, particularly preferably 1.5 mm or more, preferably 10 mm or less, more preferably 7 mm or less, and particularly preferably 5 mm or less.
  • the pitch of the knurled portion 100 may be constant or different. Normally, the knurled portion 100 corresponds to the pitch of the linear convex portion 110 included in the knurled portion 100.
  • the linear convex portion 110 has a specific height H because it protrudes from the surface 10U of the surrounding long film 10.
  • the linear convex portion 110 has one or both of the highest point 110H (see FIG. 6) and the lowest point (not shown) at the start point or the end point of the formation of the linear convex portion 110.
  • the corner portion 111 tends to be higher than the straight portion 112.
  • the height H of one linear convex portion 110 is not constant in the extending direction of the linear convex portion 110.
  • the long films 10 support each other with equal pressure in a wide area corresponding to the entire width LTD of the knurled portion 100. You can meet each other. Therefore, the occurrence of blocking and wrinkles can be suppressed.
  • the average height of the linear convex portion 110 at the corner portion 111 is preferably 1 ⁇ m or more, more preferably 2 ⁇ m or more, particularly preferably 3 ⁇ m or more, preferably 25 ⁇ m or less, more preferably 20 ⁇ m or less, and particularly preferably 15 ⁇ m or less. Is.
  • the average height of the linear convex portion 110 in the straight portion 112 is preferably 0.5 ⁇ m or more, more preferably 1 ⁇ m or more, particularly preferably 1.5 ⁇ m or more, preferably 25 ⁇ m or less, and more preferably 20 ⁇ m or less. Particularly preferably, it is 15 ⁇ m or less.
  • the knurled portion 100 formed by laser light usually includes a concave portion 120 and linear convex portions 110 provided on both sides of the concave portion 120. Since the widths of the linear convex portions 110 and the concave portions 120 are usually narrow, the combination of the linear convex portions 120 and the linear convex portions 110 can be visually recognized as a single line with the naked eye.
  • the width W of the combination of the concave portion 120 and the linear convex portion 110 is preferably 0.1 ⁇ m or more, more preferably 0.15 ⁇ m or more, particularly preferably 0.2 ⁇ m or more, preferably 1 ⁇ m or less, and more preferably 0. It is 75 ⁇ m or less, particularly preferably 0.5 ⁇ m or less.
  • the width and thickness of the long film 10 are not particularly limited, and the width and thickness according to the purpose of use can be adopted.
  • the width of the long film 10 is preferably 700 mm or more, more preferably 1000 mm or more, still more preferably 1200 mm or more, preferably 2500 mm or less, more preferably 2200 mm or less, still more preferably 2000 mm or less.
  • the thickness of the long film 10 is preferably 1 ⁇ m or more, more preferably 5 ⁇ m or more, still more preferably 20 ⁇ m or more, preferably 1000 ⁇ m or less, more preferably 300 ⁇ m or less, still more preferably 150 ⁇ m or less.
  • the long film 10 When the long film 10 is used as an optical film, it is preferable that the long film 10 has high transparency in a region without the knurled portion 100.
  • the total light transmittance of the long film 10 in the above region is preferably 85% to 100%, more preferably 92% to 100%.
  • the haze of the long film 10 in the above region is preferably 0% to 5%, more preferably 0% to 3%, and particularly preferably 0% to 2%.
  • the total light transmittance can be measured using a "turbidity meter NDH-2000" manufactured by Nippon Denshoku Kogyo Co., Ltd. in accordance with JIS K7105.
  • the haze can be measured using a turbidity meter "NDH2000" manufactured by Nippon Denshoku Kogyo Co., Ltd.
  • the long film according to the first embodiment described above is A step of preparing a pretreatment film as a film before forming the knurl portion 100; A step of forming a plurality of knurled portions 100 on at least one surface of the untreated film so as to be aligned with the MD in the longitudinal direction of the film; It can be manufactured by a manufacturing method including. Hereinafter, this manufacturing method will be described.
  • a long film provided in the same manner as the long film is prepared except that the knurl portion 100 is not formed.
  • the method of preparing this unprocessed film is not particularly limited.
  • the unprocessed film may be purchased from the market and prepared, for example. Further, the untreated film may be manufactured and prepared using the material of the long film 10. The method for producing the untreated film will be described later.
  • the knurled portion 100 is formed on the surface of the untreated film.
  • the knurled portion 100 is formed by using a laser beam. Therefore, the step of forming the knurled portion 100 includes irradiating the untreated film with a laser beam.
  • the surface of the untreated film is irradiated with laser light, thermal melting or ablation occurs locally at the place irradiated with the laser light. Therefore, in the place irradiated with the laser beam, the untreated film can be deformed in a convex shape and a concave shape.
  • FIGS. 7 to 9 are plan views schematically showing an enlarged periphery of a portion of the surface of the untreated film on which the knurled portion 100 is formed.
  • the broken line represents the portion where the linear convex portion 110 of the knurled portion 100 should be formed.
  • a linear convex portion 110 is formed at the start point 110S (FIG. 7), and the start point 110S and the end point 110E (see FIG. 9) are formed.
  • the intermediate portion 110M is a portion connecting the start point 110S as the point where the linear convex portion 110 is first formed and the end point 110E as the point where the linear convex portion 110 is finally formed.
  • the intermediate portion 110M may be a linear portion consisting of a set of points excluding the start point 110S and the end point 110E among the points where the linear convex portion 110 is formed.
  • a laser beam is applied to the starting point 110S. That is, the laser light is irradiated so that the laser light irradiation point P is formed at the start point 110S.
  • the laser light irradiation point P is formed at the start point 110S.
  • convex deformation and concave deformation occur at the starting point 110S where the irradiation point P is formed, and the linear convex portion 110 is formed.
  • the movement of the irradiation point P is started.
  • the irradiation point P that has started to move moves so as to draw a predetermined planar shape as shown by the arrow A3 in FIG.
  • a linear convex portion 110 is formed in the intermediate portion 110M as a locus in which the irradiation point P has moved.
  • the irradiation point P reaches the end point 110E as shown by an arrow A4 in FIG. 9 after passing through the entire intermediate portion 110M.
  • convex deformation and concave deformation occur at the end point 110E, and the linear convex portion 110 is formed.
  • the start point 110S and the end point 110E are set at the same point.
  • the linear convex portion 110 is formed at all of the start point 110S, the intermediate portion 110M, and the end point 110E, the knurled portion 100 having the linear convex portion 110 having a specific planar shape is formed.
  • the irradiation point P reaches the end point 110E, the irradiation of the laser beam is stopped.
  • the formation of the knurled portion 100 is usually performed while continuously transporting the untreated film in the longitudinal direction of the untreated film. Therefore, after the formation of one knurled portion 100 is completed, the formation of the next knurled portion 100 is started. Therefore, in the above-mentioned method for manufacturing the long film 10, the knurled portion 100 can be sequentially formed in the film longitudinal direction MD.
  • both the positions of the start point 110S and the end point 110E are set in the film width direction TD. Distribute to different locations. As a result, as shown in FIG. 6, at least one of the highest point 110H and the lowest point (not shown) of the linear convex portion 110 corresponding to the start point or the end point can be dispersed in the film width direction TD.
  • the first linear convex portion 110 i is formed while continuously moving the laser beam irradiation point P (not shown in FIG. 6) from the first start point 110S i to the first end point 110E i .
  • the second linear convex portion 110 ii while continuously moving the irradiation point P of the laser beam from the second start point 110S ii to the second end point 110E ii .
  • the third linear convex while continuously moving the irradiation point P of the laser beam from the third start point 110S iii to the third end point 110E iii .
  • the fourth linear convex portion 110 iv is formed to form the fourth knurled portion 100 iv ; in this order.
  • the first start point 110S i , the second start point 110S ii , the third start point 110S iii , and the fourth start point 110S iv are set at different positions in the film width direction TD.
  • first end point 110E i , the second end point 110E ii , the third end point 110E iii , and the fourth end point 110E iv are set at different positions in the film width direction TD.
  • the first to fourth knurled portions 100 i to 100 iv arranged in the film longitudinal direction MD can have the highest point 110H or the lowest point (not shown) at different positions in the film width direction TD.
  • a long film having a maximum point 110H or a minimum point (not shown) dispersed in the film width direction TD as the whole film. 10 can be manufactured.
  • the knurled portion 100 may be arranged with regularity.
  • the first to fourth knurled portions 100 i to 100 iv may be repeatedly arranged in this order. Therefore, the positions of the start points 110S such as the first to fourth start points 110S i to 110S iv and the positions of the end points 110E such as the first to fourth end points 110E i to 110E iv are respectively in the film width direction TD. It may be set with regularity. Further, the knurled portion 100 may be randomly arranged without regularity.
  • the positions of the start points 110S such as the first to fourth start points 110S i to 110S iv and the positions of the end points 110E such as the first to fourth end points 110E i to 110E iv are respectively in the film width direction TD. It may be set randomly.
  • the knurled portion 100 by forming the knurled portion 100 by dispersing the positions of both the start point 110S and the end point 110E at a plurality of different positions in the film width direction TD, the highest points dispersed in the film width direction TD as described above. It is possible to obtain a long film 10 in which a plurality of knurled portions 100 including a linear convex portion 110 having 110H or a minimum point (not shown) are formed.
  • the moving speed of the irradiation point P of the laser beam can be appropriately set within a range in which the desired knurled portion 100 can be formed.
  • the specific moving speed is preferably 500 mm / s or more, more preferably 1000 mm / s or more, particularly preferably 1500 mm / s or more, preferably 10000 mm / s or less, more preferably 9000 mm / s or less, and particularly preferably. It is 8000 mm / s or less.
  • the moving speed of the irradiation point P of the laser light is equal to or less than the upper limit of the above range, it is possible to suppress the generation of an overshoot portion due to the inertia of the movable portion (mirror or the like) included in the optical system of the laser, which is desired. Deformation from the shape can be suppressed.
  • Examples of the laser device that is a laser light irradiation device include an ArF excimer laser device, a KrF excimer laser device, a XeCl excima laser device, a YAG laser device (particularly, a third harmonic or a fourth harmonic), and a YLF or YVO 4 .
  • Examples thereof include a solid-state laser device (particularly, a third harmonic or a fourth harmonic), a Ti: S laser device, a semiconductor laser device, a fiber laser device, and a carbon dioxide gas laser device.
  • a carbon dioxide laser device is preferable from the viewpoint of being relatively inexpensive and efficiently obtaining an output suitable for film processing.
  • the output of the laser light is preferably 1 W or more, more preferably 5 W or more, still more preferably 15 W or more, preferably 120 W or less, more preferably 100 W or less, still more preferably 80 W or less, still more preferably 70 W or less. ..
  • the output of the laser light is equal to or higher than the lower limit of the above range, the shortage of the irradiation amount of the laser light can be suppressed and the knurled portion 100 can be stably formed. Further, when the output of the laser light is not more than the upper limit of the above range, it is possible to suppress the formation of through holes in the film.
  • the lowest point of the linear convex portion 110 may be dispersed in the film width direction TD.
  • both the highest point 110H and the lowest point may be dispersed in the film width direction TD.
  • the mode of dispersion of the lowest point can be the same as the highest point 110H.
  • the method of forming the dispersed lowest point may be the same as the method of forming the highest point 110H.
  • the number of positions where the highest points 110H of the linear convex portion 110 are dispersed at four locations in the film width direction TD, but the number of positions where the highest points 110H are dispersed may be other than four. good. Therefore, the number of positions where the highest point 110H is dispersed may be 2, may be 3, or may be 5 or more. Above all, 10 or more places are preferable. Further, as in the case of the highest point 110H, when the lowest point of the linear convex portion is dispersed in the film width direction TD, the number of positions where the lowest point is dispersed may be 2, 3, 4, and 5 or more, preferably 10 or more. .. Further, the number of positions where the start point and the end point of the formation of the linear convex portion 110 are dispersed may be 2, 3, 4, and 5 or more as well as the highest point 110H and the lowest point, and 10 or more is preferable.
  • start point 110S and the end point 110E of the formation of one linear convex portion 110 are set at the same position, but the start point 110S and the end point 110E are set at different positions. May be.
  • FIG. 10 is a plan view schematically showing a plan shape of one of the knurled portions 200 according to the modified example of the first embodiment as viewed from the thickness direction.
  • the nar portion 200 whose planar shape of the linear convex portion 210 is not an endless shape has an irradiation point P (FIG. 10) from the start point 210S to the end point 210E at a position different from the start point 210S. (Not shown) can be formed by a manufacturing method including irradiating a laser beam so as to move as shown by the arrow A5.
  • FIG. 11 is a plan view schematically showing a plan shape of one of the knurled portions 300 according to the modified example of the first embodiment as viewed from the thickness direction. As shown in FIG. 11, for example, it includes irradiating a part 313 of the linear convex portion 310 with a laser beam so that the irradiation point P (not shown in FIG. 10) passes a plurality of times as shown by the arrow A6. According to the manufacturing method, the start point 310S and the end point 310E can be set at different positions to form the knurled portion 300.
  • the irradiation point P starting from the start point 310S moves so as to draw the planar shape of the linear convex portion 310, returns to the start point 310S, and then further passes through a part 313 of the linear convex portion 310.
  • the end point 310E can be reached to form the knurled portion 300.
  • knurl portion 100 is formed in the film width direction TD, but a plurality of knurl portions may be formed side by side in the film width direction TD.
  • 12 and 13 show a view of the vicinity of the end portion of the long films 20 and 30 according to the modified example of the first embodiment in the film width direction TD from the thickness direction of the long films 20 and 30, respectively. It is a top view schematically showing.
  • a plurality of knurled portions 400 and 500 may be formed side by side not only in the film longitudinal direction MD but also in the film width direction TD.
  • three knurled portions 400 including the linear convex portions 410 having the same circular planar shape are formed side by side in the film width direction TD.
  • the knurled portions 400 may be formed side by side in three rows in the film longitudinal direction MD.
  • four knurled portions 500 including the linear convex portions 510 having the same rectangular planar shape are formed side by side in the film width direction TD.
  • the knurled portions 500 may be formed side by side in four rows in the film longitudinal direction MD.
  • the positions of both the start point and the end point for forming the linear convex portions 410 and 510 are dispersed in the film width direction TD.
  • at least one of the highest point and the lowest point of the linear convex portions 410 and 510 of the knurled portions 400 and 500 of the group can be dispersed in the film width direction TD.
  • the laser is formed so that the locus of the irradiation point P (not shown in FIG. 12) draws a circle from the start point 410S to the end point 410E as shown by the arrow A7.
  • the linear convex portion 410 is formed.
  • the start point 410S and the end point 410E are set at the same positions in the circular protrusions 410 of the three knurled portions 400 arranged in the film width direction TD.
  • the positions of both the start point 410S and the end point 410E are dispersedly set in the film width direction TD so that the knurled portion 400 of the group is linear. At least one of the highest point 410H and the lowest point (not shown) of the convex portion 410 can be dispersed in the film width direction TD.
  • the linear convex portion 510 is formed.
  • the start point 510S and the end point 510E are set at different positions in the rectangular shape of the four knurled portions 500 arranged in the film width direction TD.
  • the positions of both the start point 510S and the end point 510E are set dispersedly in the film width direction TD. Also in this case, at least one of the highest point 510H and the lowest point (not shown) of the linear convex portion 510 of the knurled portion 500 of the group can be dispersed in the film width direction TD.
  • the number of knurled portions 400 and 500 provided side by side in the film width direction TD is limited to the above example. not. Further, the planar shapes of the linear convex portions 410 and 510 included in the knurled portions 400 and 500 provided side by side in the film width direction TD may be the same or different.
  • FIG. 14 is a plan view schematically showing a state in which the vicinity of the end portion of the long film 40 according to the modified example of the first embodiment in the film width direction TD is viewed from the thickness direction of the long film 40.
  • the long film 40 may be formed with a knurled portion 600 including a linear convex portion 610 having a planar shape other than the endless shape.
  • the knurl portion 600 including the linear convex portion 610 having a planar shape other than the endless shape is such that the positions of both the start point and the end point are dispersed at a plurality of different positions in the film width direction TD, so that the linear convex portion 600 is linearly convex. At least one of the highest point 610H and the lowest point (not shown) of the portion 610 can be dispersed in the film width direction TD.
  • the linear convex portion 610 i of a certain knurled portion 600 i has an arrow A9 from the start point 610S i set on the left side of the figure to the end point 610E i set on the right side of the figure.
  • the irradiation point P (not shown in FIG. 14) is formed by irradiating the laser beam so as to move.
  • the linear convex portion 610 ii of another Nar portion 600 ii has an irradiation point P as shown by an arrow A10 from the start point 610S ii set on the right side in the figure to the end point 610E ii set on the left side in the figure. It is formed by irradiating a laser beam so that it moves.
  • the irradiation point P moves from the first start point 610S iii set at one end to the first end point 610E iii as shown by the arrow A11.
  • the irradiation point P moves from the second start point 610S iv set at the same position as the first end point 610E iii to the second end point 610E iv as shown by the arrow A12. Is formed by irradiating with a laser beam and performing.
  • the positions of at least one of the highest point and the lowest point of the linear convex portions 610 i to 610 iii of the narrated portions 600 i to 600 iii can be dispersed in the film width direction TD.
  • FIG. 15 is a plan view schematically showing a state of the long film 50 according to the second embodiment of the present invention as viewed from the thickness direction of the long film 50.
  • FIG. 16 is a plan view schematically showing a planar shape of one of the knurled portions 700 included in the long film 50 according to the second embodiment of the present invention as viewed from the thickness direction of the long film 50. be.
  • the long film 50 according to the second embodiment of the present invention has the long film 10 according to the first embodiment except that the knurled portion 700 is formed by inkjet printing. It is provided in the same way. Therefore, the long film 50 according to the present embodiment is a long film and has a plurality of knurled portions 700 on at least one surface 50U. These plurality of knurled portions 700 are provided side by side in the film longitudinal direction MD of the long film 50. Further, each knurl portion 700 includes a linear convex portion 710 having a continuous linear shape when viewed from the thickness direction.
  • the knurled portion 700 is formed by inkjet printing.
  • the linear convex portion 710 is formed as a line drawn by ink printed by inkjet printing.
  • the knurled portion 700 has a specific planar shape drawn by such a linear convex portion 710.
  • FIG. 17 is a cross section of the linear convex portion 710 included in the knurled portion 700 of the long film 50 according to the second embodiment of the present invention, cut along a plane perpendicular to the extending direction of the linear convex portion 710. It is sectional drawing which shows typically.
  • the long film 50 according to the present embodiment adheres to the base film layer 51 corresponding to the untreated film before the knurl portion 700 is formed and the surface 51U of the base film layer 51. Includes the linear convex portion 710.
  • the linear convex portion 710 is formed by ink adhering to the surface 51U by inkjet printing.
  • the ink includes not only liquid ink but also ink cured after printing.
  • the linear convex portion 710 protrudes from the surface 50U of the surrounding long film 50 by the amount of ink forming the linear convex portion 710. Therefore, in the knurled portion 700 including the linear convex portion 710, the substantially thickness of the long film 50 is increased.
  • the height H of the linear convex portion 710 is not constant in the extending direction of the linear convex portion 710. Therefore, the linear convex portion 710 included in each Nar portion 700 includes one or both of the highest point and the lowest point.
  • One or both of the highest point and the lowest point may be formed at the start point or the end point of the formation of the linear convex portion 710 by inkjet printing.
  • a mechanism in which the highest point or the lowest point of the linear convex portion 710 is formed by inkjet printing will be described. However, the mechanism described below is an example, and the mechanism for forming the highest point and the lowest point is not limited to these examples.
  • the highest point and the lowest point of the linear convex portion 710 can be formed at the start point or the end point of the formation of the linear convex portion 710 by inkjet printing. Whether the highest point and the lowest point of the linear convex portion 710 are formed at the start point or the end point may depend on printing conditions such as an inkjet printing drive device, a nozzle shape, and an injection speed.
  • the drawing point is moved by moving the nozzle relative to the film surface so that a desired planar shape can be drawn, and a linear convex portion is formed.
  • the start point and the end point are usually set to constant positions in the film width direction TD. Therefore, as in the case of laser light, when a long film having a knurled portion including the linear convex portion is wound, the highest points of the wound long films may overlap or the lowest points may overlap. I could have done it. Therefore, in the past, the ability to suppress the occurrence of blocking and wrinkles was inferior.
  • At least one of the highest point and the lowest point of the linear convex portion 710 of each of the knurled portions 700 is dispersed in the film width direction TD. .. Therefore, when the long film 50 is wound to obtain a roll, at least one of the highest point and the lowest point of the long film 50 rolled in the roll is concentrated at one position of the TD in the film width direction. Instead of overlapping, they are distributed and overlapped at multiple different positions. Therefore, the uniformity of the substantially thickness of the portion provided with the knurl portion 700 is improved as the entire roll. Therefore, since the long films 50 can support each other with uniform pressure in a portion having a wide area corresponding to the entire width of the knurl portion 700, the ability to suppress the generation of blocking and wrinkles can be improved.
  • the long film 50 having the knurled portion 700 including the linear convex portion 710 in which at least one of the highest point and the lowest point is dispersed has the positions of both the start point and the end point. It can be obtained by dispersing in the film width direction TD.
  • the long film according to the second embodiment is A step of preparing a pre-processed film as a film before forming the knurled portion 700; A step of forming a plurality of knurled portions 700 on at least one surface of the untreated film so as to be aligned with the MD in the longitudinal direction of the film; It can be manufactured by a manufacturing method including.
  • the knurled portion 700 is formed by inkjet printing. Therefore, in the step of forming one knurled portion 700, ink is printed at the start point to form the linear convex portion 710, and ink is printed at the intermediate portion between the start point and the end point to form the linear convex portion 710. Forming the 710 and printing ink at the end point to form the linear convex portion 710 are continuously included in this order. Further, the formation of the knurled portion 700 by inkjet printing is usually performed while continuously transporting the untreated film in the longitudinal direction of the untreated film, as in the formation by the laser beam described in the first embodiment. Therefore, after the formation of one Nar portion 700 is completed, the formation of the next Nar portion 700 is started. Therefore, in the above-mentioned method for manufacturing the long film 50, the knurled portion 700 can be sequentially formed in the film longitudinal direction MD.
  • both the positions of the start point and the end point are set in the film width direction. Disperse in multiple different positions in the TD. Thereby, at least one of the highest point and the lowest point of the linear convex portion 710 corresponding to the start point or the end point can be dispersed in the film width direction TD.
  • the same advantages as the long film 10 according to the first embodiment can be obtained.
  • the long film 50 according to the second embodiment may be further modified and implemented.
  • it may be modified in the same manner as in the first embodiment or its modified example.
  • the material of the long film described above is not limited, but a resin is usually used.
  • the long film can be obtained as a long resin film.
  • This resin film may be a stretched film or an unstretched film.
  • the resin film may be a single-layer film having only a base material layer, or may be a multi-layer film having an arbitrary layer in combination with the base material layer.
  • a layer made of resin is usually used as the base material layer.
  • various resins can be used depending on the use of the long film, and among them, the cyclic olefin resin and the (meth) acrylic resin are preferable.
  • a film provided with a substrate layer made of a cyclic olefin resin or a (meth) acrylic resin generally tends to entrain air during winding, and therefore tends to be inferior in winding property.
  • the winding property can be improved, and usually, winding deviation, winding tightening, winding loosening and meandering can be effectively suppressed.
  • the cyclic olefin resin is a resin containing a cyclic olefin polymer.
  • the cyclic olefin polymer is excellent in mechanical properties, heat resistance, transparency, low hygroscopicity, dimensional stability and light weight.
  • the cyclic olefin polymer represents a polymer in which the structural unit of the polymer has an alicyclic structure.
  • the cyclic olefin polymer is a polymer having an alicyclic structure in the main chain, a polymer having an alicyclic structure in the side chain, a polymer having an alicyclic structure in the main chain and the side chain, and two of these. It can be a mixture of any of the above ratios. Among them, a polymer having an alicyclic structure in the main chain is preferable from the viewpoint of mechanical strength and heat resistance.
  • alicyclic structure examples include a saturated alicyclic hydrocarbon (cycloalkane) structure and an unsaturated alicyclic hydrocarbon (cycloalkene, cycloalkyne) structure.
  • cycloalkane structure and a cycloalkene structure are preferable, and a cycloalkane structure is particularly preferable, from the viewpoint of mechanical strength and heat resistance.
  • the number of carbon atoms constituting the alicyclic structure is preferably 4 or more, more preferably 5 or more, preferably 30 or less, more preferably 20 or less, particularly preferably 20 or less, per alicyclic structure. Is 15 or less. When the number of carbon atoms constituting the alicyclic structure is in this range, the mechanical strength, heat resistance and moldability of the resin are highly balanced.
  • the ratio of the structural unit having an alicyclic structure is preferably 55% by weight or more, more preferably 70% by weight or more, and particularly preferably 90% by weight or more.
  • the ratio of structural units having an alicyclic structure in the cyclic olefin polymer is in this range, transparency and heat resistance are good.
  • cyclic olefin polymer examples include norbornene-based polymers, monocyclic cyclic olefin-based polymers, cyclic conjugated diene-based polymers, vinyl alicyclic hydrocarbon-based polymers, and hydrides thereof. ..
  • norbornene-based polymer and its hydride are particularly suitable because they have good moldability.
  • Examples of the norbornene-based polymer and its hydride include a ring-opening polymer of a monomer having a norbornene structure and a hydride thereof; an addition polymer of a monomer having a norbornene structure and a hydride thereof.
  • Examples of the ring-opening polymer of the monomer having a norbornene structure include a ring-opening copolymer of one kind of monomer having a norbornene structure and ring-opening of two or more kinds of monomers having a norbornene structure. Examples thereof include a copolymer and a ring-opening copolymer with a monomer having a norbornene structure and another monomer copolymerizable therewith.
  • examples of the addition polymer of the monomer having a norbornene structure are an addition homopolymer of one kind of monomer having a norbornene structure and an addition copolymer of two or more kinds of monomers having a norbornene structure.
  • an addition copolymer of a monomer having a norbornene structure and another monomer copolymerizable therewith are particularly suitable from the viewpoints of moldability, heat resistance, low hygroscopicity, dimensional stability, light weight and the like.
  • the weight average molecular weight (Mw) of the cyclic olefin polymer is preferably 10,000 or more, more preferably 15,000 or more, particularly preferably 20,000 or more, preferably 100,000 or less, more preferably 80, It is 000 or less, particularly preferably 50,000 or less.
  • Mw weight average molecular weight
  • the molecular weight distribution (weight average molecular weight (Mw) / number average molecular weight (Mn)) of the cyclic olefin polymer is preferably 1.2 or more, more preferably 1.5 or more, and particularly preferably 1.8 or more. Is 3.5 or less, more preferably 3.0 or less, and particularly preferably 2.7 or less.
  • Mw weight average molecular weight
  • Mn number average molecular weight
  • the weight average molecular weight and the number average molecular weight are polyisoprene or polystyrene-equivalent weight average molecular weights measured by gel permeation chromatography using cyclohexane as a solvent.
  • toluene may be used as the solvent.
  • the glass transition temperature of the cyclic olefin polymer is preferably 130 ° C. or higher, more preferably 135 ° C. or higher, preferably 150 ° C. or lower, and more preferably 145 ° C. or lower.
  • the glass transition temperature is at least the lower limit of the above range, the durability of the film under high temperature can be improved. Further, when the glass transition temperature is not more than the upper limit of the above range, the stretching treatment can be easily performed.
  • cyclic olefin polymer for example, the one described in International Publication No. 2017/145718 can be used.
  • the proportion of the cyclic olefin polymer in the cyclic olefin resin is preferably 50% by weight to 100% by weight, more preferably 70% by weight to 100% by weight, and particularly preferably 90% by weight to 100% by weight. When the proportion of the polymer is in the above range, sufficient heat resistance and transparency can be obtained.
  • the cyclic olefin resin may contain any component other than the cyclic olefin polymer as long as the effect of the present invention is not significantly impaired.
  • arbitrary components include colorants such as pigments and dyes; fluorescent whitening agents; dispersants; heat stabilizers; light stabilizers; ultraviolet absorbers; antistatic agents; antioxidants; lubricants; etc. Be done. In addition, one of these may be used alone, or two or more of them may be used in combination at any ratio.
  • the (meth) acrylic resin is a resin containing a (meth) acrylic polymer.
  • the (meth) acrylic polymer means a polymer of acrylic acid or an acrylic acid derivative, and examples thereof include polymers and copolymers of acrylic acid, acrylic acid ester, acrylamide, acrylonitrile, methacrylic acid and methacrylic acid ester. Be done. Since the (meth) acrylic polymer has high strength and hardness, a film having high mechanical strength can be realized.
  • the (meth) acrylic polymer a polymer containing a structural unit having a structure obtained by polymerizing a (meth) acrylic acid ester is preferable.
  • the (meth) acrylic acid ester include an alkyl ester of (meth) acrylic acid. Among them, a compound having a structure derived from (meth) acrylic acid and an alkanol having 1 to 15 carbon atoms or a cycloalkanol is preferable. Further, a compound having a structure derived from (meth) acrylic acid and an alkanol having 1 to 8 carbon atoms is more preferable.
  • acrylic acid ester examples include methyl acrylate, ethyl acrylate, n-propyl acrylate, i-propyl acrylate, n-butyl acrylate, i-butyl acrylate, sec-butyl acrylate, and t acrylate.
  • -Butyl, n-hexyl acrylate, cyclohexyl acrylate, n-octyl acrylate, 2-ethylhexyl acrylate, n-decyl acrylate, n-dodecyl acrylate and the like can be mentioned.
  • methacrylic acid ester examples include methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, i-propyl methacrylate, n-butyl methacrylate, i-butyl methacrylate, sec-butyl methacrylate and methacrylic acid.
  • methacrylic acid ester examples include t-butyl acid acid, n-hexyl methacrylate, n-octyl methacrylate, 2-ethylhexyl methacrylate, n-decyl methacrylate, n-dodecyl methacrylate and the like.
  • the (meth) acrylic acid ester may have a substituent such as a hydroxyl group or a halogen atom as long as the effect of the present invention is not significantly impaired.
  • substituents such as 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxyethyl methacrylate.
  • examples thereof include hydroxypropyl, 4-hydroxybutyl methacrylate, 3-chloro-2-hydroxypropyl methacrylate, and glycidyl methacrylate.
  • One of these may be used alone, or two or more of them may be used in combination at any ratio.
  • the (meth) acrylic polymer may be a polymer containing only acrylic acid or an acrylic acid derivative, but is a copolymer of acrylic acid or an acrylic acid derivative and an arbitrary monomer copolymerizable therewith. But it may be.
  • the optional monomer include ⁇ , ⁇ -ethylenic unsaturated carboxylic acid ester monomers other than the above-mentioned (meth) acrylic acid ester, and ⁇ , ⁇ -ethylenically unsaturated carboxylic acid monomers.
  • the (meth) acrylic polymer contains a structural unit having a structure obtained by polymerizing an arbitrary monomer, a structure having a structure obtained by polymerizing an arbitrary monomer in the (meth) acrylic polymer.
  • the amount of the unit is preferably 50% by weight or less, more preferably 15% by weight or less, and particularly preferably 10% by weight or less.
  • polymethacrylate is preferable, and polymethylmethacrylate is more preferable.
  • (meth) acrylic polymer for example, the one described in International Publication No. 2017/145718 can be used.
  • the proportion of the (meth) acrylic polymer in the (meth) acrylic resin is preferably 50% by weight to 100% by weight, more preferably 70% by weight to 100% by weight, and particularly preferably 90% by weight to 100% by weight. When the proportion of the polymer is in the above range, sufficient mechanical strength can be obtained.
  • the (meth) acrylic resin may contain any component other than the (meth) acrylic polymer as long as the effects of the present invention are not significantly impaired.
  • any component include examples similar to any component that a cyclic olefin resin may contain. Further, any component may be used alone or in combination of two or more at any ratio.
  • the multi-layer film includes a base material layer and a functional layer.
  • the functional layer may be provided on one side of the base material layer or may be provided on both sides.
  • the functional layer is preferably provided on the knurled portion side of the base material layer, and more preferably the knurled portion is provided on the surface of the functional layer.
  • Examples of such a functional layer include an antistatic layer, a hard coat layer, an adhesion prevention layer, and an easy-adhesion layer.
  • the functional layer for example, those described in International Publication No. 2017/145718 may be used.
  • the long film can be manufactured by a manufacturing method including a step of preparing a pre-treated film and a step of forming a knurled portion on the pre-treated film to obtain a long film.
  • a manufacturing method including a step of preparing a pre-treated film and a step of forming a knurled portion on the pre-treated film to obtain a long film.
  • the method for producing the untreated film There are no restrictions on the method for producing the untreated film.
  • the pretreatment film can be produced by a method including a step of molding a resin by an appropriate film molding method to obtain a base material layer.
  • the film molding method include a cast molding method, an extrusion molding method, and an inflation molding method.
  • the melt extrusion method that does not use a solvent is preferable from the viewpoint of efficiently reducing the amount of residual volatile components, the global environment and the working environment, and the excellent manufacturing efficiency.
  • an inflation method using a die may be used, but the T-die method is preferable in terms of excellent productivity and thickness accuracy.
  • the method for producing the pretreatment film is a step of forming a functional layer on the base material layer after the step of obtaining the base material layer. May include.
  • the long film can be used for a wide range of purposes, and it is particularly preferable to use it as an optical film.
  • the optical film include a retardation film, a polarizing plate protective film, an optical compensation film, and the like. Above all, the above-mentioned long film is preferably used as a polarizing plate protective film.
  • the polarizing plate usually includes a polarizing element and a polarizing plate protective film. Therefore, when the above-mentioned long film is used as a polarizing plate protective film, it is usually used by laminating the long film on a polarizing element.
  • the long film and the splitter When the long film and the splitter are bonded, the long film and the splitter may be directly bonded without using an adhesive, or may be bonded via an adhesive. Further, the long film may be attached to only one surface of the polarizing element, or may be attached to both surfaces. When the long film is attached to only one surface of the splitter, another highly transparent film may be attached to the other surface of the extruder.
  • a film produced by adsorbing iodine or a dichroic dye on a polyvinyl alcohol film and then uniaxially stretching it in a boric acid bath can be used.
  • the polarizing element for example, a film produced by adsorbing iodine or a dichroic dye on a polyvinyl alcohol film and stretching the film, and further modifying a part of the polyvinyl alcohol units in the molecular chain to polyvinylene units can be used. ..
  • the splitter for example, a grid splitter, a multilayer splitter, a cholesteric liquid crystal splitter, or the like, which has a function of separating polarized light into reflected light and transmitted light, may be used.
  • a polarizing element containing polyvinyl alcohol is preferable.
  • the degree of polarization of the splitter is preferably 98% or more, more preferably 99% or more.
  • the average thickness of the stator is preferably 5 ⁇ m to 80 ⁇ m.
  • an optically transparent adhesive can be used as the adhesive for adhering the long film and the polarizing element.
  • the adhesive include water-based adhesives, solvent-based adhesives, two-component curable adhesives, photocurable adhesives, pressure-sensitive adhesives, and the like. Of these, water-based adhesives and photocurable adhesives are preferable, and polyvinyl alcohol-based water-based adhesives are particularly preferable.
  • the adhesive for example, those described in International Publication No. 2017/145718 may be used.
  • one type of adhesive may be used alone, or two or more types may be used in combination at any ratio.
  • the binder and the long film may be bonded together via the adhesive, and then the adhesive may be cured if necessary. good.
  • a method for curing the adhesive an appropriate method can be adopted depending on the type of the adhesive. For example, when a photocurable adhesive is used, the adhesive can be cured by irradiation with active energy rays such as ultraviolet rays.
  • an adhesive layer is provided between the polarizing element and the long film.
  • the average thickness of this adhesive layer is preferably 0.05 ⁇ m or more, more preferably 0.1 ⁇ m or more, preferably 5 ⁇ m or less, and more preferably 1 ⁇ m or less.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Toxicology (AREA)
  • Materials Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Abstract

L'invention concerne un film continu ayant, dans au moins une de ses surfaces, une pluralité de régions striées qui, vues dans le sens de l'épaisseur du film, comprennent des saillies linéaires disposées consécutivement, les régions striées étant formées côte à côte dans le sens machine du film et les positions des points les plus élevés et/ou des points les plus bas des saillies des régions striées respectives étant réparties dans le sens transversal du film.
PCT/JP2021/038182 2020-10-29 2021-10-15 Film continu et son procédé de production WO2022091815A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN202180071308.3A CN116419940A (zh) 2020-10-29 2021-10-15 长条膜及其制造方法
KR1020237012443A KR20230095068A (ko) 2020-10-29 2021-10-15 장척 필름 및 그 제조 방법
JP2022559012A JPWO2022091815A1 (fr) 2020-10-29 2021-10-15

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JP2020-181410 2020-10-29
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KR (1) KR20230095068A (fr)
CN (1) CN116419940A (fr)
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WO (1) WO2022091815A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014103988A1 (fr) * 2012-12-27 2014-07-03 東レ株式会社 Film pour moulage
WO2016076155A1 (fr) * 2014-11-10 2016-05-19 住友化学株式会社 Film de résine thermoplastique
WO2017145718A1 (fr) * 2016-02-26 2017-08-31 日本ゼオン株式会社 Film long

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5578759B2 (ja) 2007-08-10 2014-08-27 日東電工株式会社 フィルム及びその製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014103988A1 (fr) * 2012-12-27 2014-07-03 東レ株式会社 Film pour moulage
WO2016076155A1 (fr) * 2014-11-10 2016-05-19 住友化学株式会社 Film de résine thermoplastique
WO2017145718A1 (fr) * 2016-02-26 2017-08-31 日本ゼオン株式会社 Film long

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JPWO2022091815A1 (fr) 2022-05-05
CN116419940A (zh) 2023-07-11
KR20230095068A (ko) 2023-06-28

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