TWI795590B - Polyvinyl alcohol-based film roll and its manufacturing method - Google Patents
Polyvinyl alcohol-based film roll and its manufacturing method Download PDFInfo
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- 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
- B65H18/08—Web-winding mechanisms
- B65H18/26—Mechanisms for controlling contact pressure on winding-web package, e.g. for regulating the quantity of air between web layers
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
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- 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
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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- G02B5/30—Polarising elements
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Abstract
Description
本發明關於將作為偏光膜之形成材料使用之聚乙烯醇系薄膜捲繞於芯管而獲得的聚乙烯醇系薄膜輥及其製法。The present invention relates to a polyvinyl alcohol-based film roll obtained by winding a polyvinyl alcohol-based film used as a material for forming a polarizing film around a core tube, and a manufacturing method thereof.
聚乙烯醇系薄膜作為透明性優異的薄膜而利用在多種用途,其有用的用途之一可列舉偏光膜。該偏光膜作為液晶顯示器之基本構成要素使用。A polyvinyl alcohol-based film is used in various applications as a film excellent in transparency, and one of the useful applications thereof is a polarizing film. This polarizing film is used as a basic component of a liquid crystal display.
上述聚乙烯醇系薄膜,一般利用以聚乙烯醇系樹脂水溶液作為形成材料之連續澆鑄法形成長條的帶狀後,為了使寬度成為設計值,係將兩側端部切斷除去(切去)而製造,之後,使用捲繞機捲繞於圓筒狀的芯管。該捲繞機係以接觸或接近上述芯管之狀態具備1支控制輥(稱為接觸輥(touch roller、contact roller)等),上述聚乙烯醇系薄膜接觸該控制輥後再捲繞於上述芯管(例如,參照專利文獻1、2)。另外,藉由該控制輥,可控制上述捲繞狀態。如此,可獲得由上述芯管、與捲繞於該芯管之上述聚乙烯醇系薄膜構成的聚乙烯醇系薄膜輥。The above-mentioned polyvinyl alcohol-based film is generally formed into a long strip shape by continuous casting using a polyvinyl alcohol-based resin aqueous solution as a forming material, and the ends on both sides are cut off (cut off) to make the width a design value. ) and manufactured, and then wound up on a cylindrical core pipe using a winding machine. The winding machine is equipped with a control roller (called a touch roller, contact roller, etc.) in a state of contacting or approaching the above-mentioned core tube, and the above-mentioned polyvinyl alcohol-based film is wound on the above-mentioned control roller after contacting the control roller. Core pipe (for example, refer to
就上述偏光膜而言,係從上述聚乙烯醇系薄膜輥抽出聚乙烯醇系薄膜,並經由針對該聚乙烯醇系薄膜進行的膨潤步驟、染色步驟、延伸步驟等而製造。 [先前技術文獻] [專利文獻]The above-mentioned polarizing film is produced by drawing out a polyvinyl alcohol-based film from the above-mentioned polyvinyl alcohol-based film roll, and passing through a swelling step, a dyeing step, and a stretching step for the polyvinyl alcohol-based film. [Prior Technical Literature] [Patent Document]
[專利文獻1]日本特開2004-106376號公報 [專利文獻2]國際公開第2017/038955號[Patent Document 1] Japanese Unexamined Patent Publication No. 2004-106376 [Patent Document 2] International Publication No. 2017/038955
[發明所欲解決之課題][Problem to be solved by the invention]
最近,上述液晶顯示器正在大型化,與此相伴,該液晶顯示器之基本構成要素即上述偏光膜的大型化,進而該偏光膜之形成材料即上述聚乙烯醇系薄膜的長條化及寬幅化正進展中。Recently, the size of the above-mentioned liquid crystal display has been increasing. Along with this, the size of the above-mentioned polarizing film, which is a basic component of the liquid crystal display, has increased, and furthermore, the above-mentioned polyvinyl alcohol-based film, which is a material for forming the polarizing film, has become longer and wider. In progress.
但是,所製造的上述聚乙烯醇系薄膜長條化及寬幅化的話,視情形會有以該聚乙烯醇系薄膜作為形成材料而製造的偏光膜產生色斑等,該偏光膜的性能惡化的情況。上述聚乙烯醇系薄膜薄的話,該傾向變得顯著。However, if the above-mentioned polyvinyl alcohol-based film produced is elongated and widened, the polarizing film produced using the polyvinyl alcohol-based film as a forming material may cause color spots, etc., and the performance of the polarizing film may deteriorate. Case. This tendency becomes remarkable when the said polyvinyl-alcohol-type film is thin.
於是,本案發明人等針對因上述聚乙烯醇系薄膜之長條化及寬幅化而導致上述偏光膜性能惡化的原因進行探究。其結果,發現上述聚乙烯醇系薄膜輥會發生至今未所見之明顯皺褶、偏心(經捲繞的聚乙烯醇系薄膜之外徑的偏離)。因此,製造上述偏光膜時,當從上述聚乙烯醇系薄膜輥抽出聚乙烯醇系薄膜時,該聚乙烯醇系薄膜會有皺褶,或因為上述偏心而導致其抽出狀態變得不均勻。本案發明人等查明由此會導致所製造之上述偏光膜的性能惡化。在這方面上述聚乙烯醇系薄膜輥存有改善的餘地。Then, the inventors of the present invention investigated the reason why the performance of the polarizing film deteriorated due to the elongation and width of the polyvinyl alcohol-based film. As a result, it was found that the roll of the above-mentioned polyvinyl alcohol-based film has significant wrinkles and eccentricity (deviation of the outer diameter of the wound polyvinyl alcohol-based film) that have not been seen so far. Therefore, when the polyvinyl alcohol-based film is pulled out from the roll of the above-mentioned polyvinyl alcohol-based film when the polarizing film is produced, the polyvinyl alcohol-based film has wrinkles, or the drawn-out state becomes uneven due to the above-mentioned eccentricity. The inventors of the present invention have found that this will lead to deterioration of the performance of the manufactured polarizing film. In this regard, the above-mentioned polyvinyl alcohol-based film roll has room for improvement.
本發明係鑒於如此之情事而成,旨在提供即使使捲繞於芯管之聚乙烯醇系薄膜長條化及寬幅化,仍不會發生皺褶、偏心的聚乙烯醇系薄膜輥及其製法。 [解決課題之手段]The present invention is made in view of such circumstances, and aims to provide a polyvinyl alcohol film roll and a polyvinyl alcohol film roll that does not cause wrinkles and eccentricity even if the polyvinyl alcohol film wound on the core tube is elongated and widened. Its method. [Means to solve the problem]
為了達成上述目的,本案發明人等鑒於如上述獲得之發現,針對聚乙烯醇系薄膜輥進一步進行研究。其結果查明:發生明顯皺褶、偏心的聚乙烯醇系薄膜輥,其捲繞硬度會因上述聚乙烯醇系薄膜之寬度方向的位置而大幅不同。另外,發現以減小上述寬度方向之捲繞硬度的偏差的方式將聚乙烯醇系薄膜捲繞於芯管的話,會抑制聚乙烯醇系薄膜輥發生皺褶、偏心,可獲得外觀形狀優異的聚乙烯醇系薄膜輥。In order to achieve the above objects, the inventors of the present application further conducted studies on polyvinyl alcohol-based film rolls in view of the findings obtained as described above. As a result, it was found that the winding hardness of a polyvinyl alcohol-based film roll having significant wrinkles and eccentricity greatly differs depending on the position in the width direction of the polyvinyl alcohol-based film. In addition, it was found that if the polyvinyl alcohol-based film is wound on the core tube so as to reduce the variation in the winding hardness in the width direction, the wrinkling and eccentricity of the polyvinyl alcohol-based film roll can be suppressed, and a product with excellent appearance shape can be obtained. Polyvinyl alcohol-based film roll.
亦即,本發明之要旨為下列[1]~[8]。 [1]一種聚乙烯醇系薄膜輥,具備: 軸方向之長度為3.5m以上之芯管,及 捲繞於該芯管的寬度3.5m以上、厚度60μm以下、長度5000m以上之聚乙烯醇系薄膜; 上述聚乙烯醇系薄膜之於寬度方向之捲繞硬度的偏差為硬度計硬度15以下。 [2]如上述[1]之聚乙烯醇系薄膜輥,其中,上述捲繞硬度落在硬度計硬度60~95之範圍內。 [3]如上述[1]或[2]之聚乙烯醇系薄膜輥,其中,上述聚乙烯醇系薄膜之含水率為5重量%以下。 [4]一種聚乙烯醇系薄膜輥之製法,係藉由在軸方向之長度為3.5m以上之芯管的附近,與該芯管平行地設置第1控制輥及第2控制輥,使上述芯管旋轉,使寬度3.5m以上、厚度60μm以下、長度5000m以上之聚乙烯醇系薄膜邊和上述第1控制輥及第2控制輥中之至少一者接觸邊捲繞於上述芯管,而獲得具備上述芯管、及捲繞於該芯管之上述聚乙烯醇系薄膜的如上述[1]~[3]中任一項之聚乙烯醇系薄膜輥, 捲繞中,隨著捲繞於旋轉的上述芯管之聚乙烯醇系薄膜的外徑增加,使上述芯管慢慢遠離上述第1控制輥及第2控制輥, 其中,直到從捲繞開始至捲繞結束期間的預定時間點,使上述聚乙烯醇系薄膜邊接觸上述第1控制輥邊捲繞於上述芯管, 上述預定時間點以後直到捲繞結束,使上述聚乙烯醇系薄膜邊接觸第2控制輥而不接觸上述第1控制輥邊捲繞於上述芯管, 藉此,從捲繞開始至捲繞結束,將上述聚乙烯醇系薄膜之進入角度維持在2~35°之範圍內。 [5]如上述[4]之聚乙烯醇系薄膜輥之製法,其中,上述第1控制輥及第2控制輥可各自獨立地進行位置調整。 [6]如上述[4]或[5]之聚乙烯醇系薄膜輥之製法,其中,將上述聚乙烯醇系薄膜捲繞於上述芯管的捲繞張力維持在100~300N/m之範圍內。 [7]如上述[4]~[6]中任一項之聚乙烯醇系薄膜輥之製法,其中,捲繞於上述芯管的聚乙烯醇系薄膜之外周面與上述第1控制輥之外周面之間的間隙維持在2~10mm之範圍內。 [8]如上述[4]~[7]中任一項之聚乙烯醇系薄膜輥之製法,其中,上述聚乙烯醇系薄膜之捲繞速度為35m/分鐘以上。That is, the gist of the present invention is the following [1] to [8]. [1] A polyvinyl alcohol-based film roll comprising: A core tube with an axial length of more than 3.5m, and A polyvinyl alcohol-based film with a width of 3.5 m or more, a thickness of 60 μm or less, and a length of 5,000 m or more wound around the core tube; The variation in winding hardness in the width direction of the polyvinyl alcohol-based film is 15 or less in durometer hardness. [2] The polyvinyl alcohol-based film roll according to [1] above, wherein the winding hardness falls within a range of 60 to 95 durometer hardness. [3] The polyvinyl alcohol-based film roll according to the above [1] or [2], wherein the moisture content of the polyvinyl alcohol-based film is 5% by weight or less. [4] A method of manufacturing a polyvinyl alcohol-based film roll, which is to arrange a first control roll and a second control roll in parallel with the core tube in the vicinity of a core tube with a length of 3.5 m or more in the axial direction, so that the above-mentioned The core tube is rotated so that the polyvinyl alcohol-based film with a width of 3.5 m or more, a thickness of 60 μm or less, and a length of 5000 m or more is wound around the core tube while contacting at least one of the first control roll and the second control roll, and Obtaining the polyvinyl alcohol-based film roll according to any one of the above-mentioned [1] to [3] comprising the above-mentioned core tube and the above-mentioned polyvinyl alcohol-based film wound around the core tube, During winding, as the outer diameter of the polyvinyl alcohol-based film wound on the rotating core tube increases, the core tube is gradually moved away from the first control roll and the second control roll, Wherein, the above-mentioned polyvinyl alcohol-based film is wound up on the above-mentioned core pipe while contacting the above-mentioned first control roller until a predetermined time point between the start of winding and the end of winding, After the predetermined time point until the winding is completed, the polyvinyl alcohol-based film is wound around the core tube while contacting the second control roll without contacting the first control roll, Thereby, the entry angle of the polyvinyl alcohol-based film is maintained within a range of 2 to 35° from the start of winding to the end of winding. [5] The method for producing a roll of a polyvinyl alcohol-based film according to [4] above, wherein the first control roll and the second control roll are positionally adjustable independently of each other. [6] The method for producing a polyvinyl alcohol-based film roll according to the above [4] or [5], wherein the winding tension of the polyvinyl alcohol-based film wound on the core tube is maintained in the range of 100 to 300 N/m Inside. [7] The method for producing a roll of a polyvinyl alcohol-based film according to any one of [4] to [6] above, wherein the distance between the outer peripheral surface of the polyvinyl alcohol-based film wound around the core tube and the first control roll is The gap between the outer peripheral surfaces is maintained within the range of 2-10mm. [8] The method for producing a polyvinyl alcohol-based film roll according to any one of [4] to [7] above, wherein the winding speed of the polyvinyl alcohol-based film is 35 m/min or more.
此處,本發明之聚乙烯醇系薄膜輥中之聚乙烯醇系薄膜之於寬度方向之捲繞硬度的「偏差」,係測定從其寬度方向之一端部到另一端部之最短距離上的多個部位而得的捲繞硬度之最大值與最小值的差。 又,本發明之聚乙烯醇系薄膜輥之製法中之聚乙烯醇系薄膜之「進入角度」,如圖2、3所示般,於捲繞聚乙烯醇系薄膜2之狀態,係即將捲繞之聚乙烯醇系薄膜2最初接觸的通過製造中之聚乙烯醇系薄膜輥之部分的假想垂線L、和上述即將捲繞之聚乙烯醇系薄膜2所形成的角度(圖2之α、圖3之β)。 [發明之效果]Here, the "deviation" of the winding hardness of the polyvinyl alcohol-based film in the width direction of the polyvinyl alcohol-based film roll of the present invention is measured on the shortest distance from one end to the other end in the width direction. The difference between the maximum value and the minimum value of the winding hardness obtained from multiple locations. Also, the "entry angle" of the polyvinyl alcohol-based film in the manufacturing method of the polyvinyl alcohol-based film roll of the present invention, as shown in Figs. The angle (α, β of Figure 3). [Effect of the invention]
本發明之聚乙烯醇系薄膜輥,捲繞於芯管之聚乙烯醇系薄膜之於寬度方向之捲繞硬度的偏差為硬度計硬度15以下。因此,上述聚乙烯醇系薄膜即使為寬度3.5m以上之寬幅、長度5000m以上之長條,仍以均勻的狀態捲繞。而且,上述聚乙烯醇系薄膜即使為厚度60μm以下之薄型,仍維持其均勻的捲裝狀態。亦即,本發明之聚乙烯醇系薄膜輥,幾乎不會有皺褶、偏心。因此,在製造偏光膜時,當從本發明之聚乙烯醇系薄膜輥抽出聚乙烯醇系薄膜時,該聚乙烯醇系薄膜沒有皺褶,且可使其抽出狀態均勻。其結果,可獲得沒有色斑等的性能優異的偏光膜。In the polyvinyl alcohol-based film roll of the present invention, the variation in winding hardness in the width direction of the polyvinyl alcohol-based film wound on the core tube is 15 or less in durometer hardness. Therefore, even if the above-mentioned polyvinyl alcohol-based film has a wide width of 3.5 m or more and a long strip with a length of 5000 m or more, it is wound in a uniform state. Furthermore, even if the above-mentioned polyvinyl alcohol-based film is thin with a thickness of 60 μm or less, it maintains its uniform roll state. That is, the roll of the polyvinyl alcohol-based film of the present invention has almost no wrinkles or eccentricity. Therefore, when the polyvinyl alcohol-based film is drawn out from the roll of the polyvinyl alcohol-based film of the present invention when producing a polarizing film, the polyvinyl alcohol-based film has no wrinkles and can be drawn out uniformly. As a result, a polarizing film having excellent performance free from color unevenness and the like can be obtained.
接著,基於圖式詳細地說明本發明之實施形態。Next, embodiments of the present invention will be described in detail based on the drawings.
[聚乙烯醇系薄膜輥]
圖1係顯示本發明之聚乙烯醇系薄膜輥之一實施形態的立體圖。該聚乙烯醇系薄膜輥具備:軸方向之長度為3.5m以上之芯管1、及捲繞於該芯管1之外周面的寬度3.5m以上、厚度60μm以下、長度5000m以上之聚乙烯醇系薄膜2。另外,該聚乙烯醇系薄膜2之於寬度方向之捲繞硬度的偏差為硬度計硬度15以下。此為本發明之一大特徵構成。
藉由該特徵構成,即使捲繞的聚乙烯醇系薄膜2如上述般為寬幅、長條、薄型,上述聚乙烯醇系薄膜輥亦幾乎沒有皺褶、偏心,為聚乙烯醇系薄膜2以均勻狀態捲繞而成者。
此外,圖1中,為了使上述聚乙烯醇系薄膜輥之構成易於理解,在示意性地顯示各構成的同時,改變各構成之大小的比例進行圖示。[Polyvinyl alcohol-based film roll]
Fig. 1 is a perspective view showing an embodiment of a polyvinyl alcohol-based film roll of the present invention. The polyvinyl alcohol-based film roll includes: a
另外,上述聚乙烯醇系薄膜輥,如上述般,捲繞硬度的偏差為硬度計硬度15以下之小,幾乎沒有皺褶、偏心,故在製造偏光膜時,從該聚乙烯醇系薄膜輥抽出聚乙烯醇系薄膜2的話,該聚乙烯醇系薄膜2沒有皺褶,且可使其抽出狀態均勻。其結果,獲得之偏光膜成為性能優異(於寬度方向之偏光度的偏差小、沒有色斑等)者。In addition, the above-mentioned polyvinyl alcohol-based film roll has a small deviation in winding hardness of 15 or less in durometer hardness as described above, and has almost no wrinkles or eccentricity. Therefore, when manufacturing a polarizing film, the polyvinyl alcohol-based film roll When the polyvinyl alcohol-based
更詳細說明的話,考量使所製造之上述偏光膜的性能更加優異的觀點,上述聚乙烯醇系薄膜輥之捲繞硬度宜為硬度計硬度60~95之範圍內,特佳為硬度計硬度65~92之範圍內,更佳為硬度計硬度70~90之範圍內。
該捲繞硬度過大地捲繞的話,在該捲繞步驟中會有芯管1發生變形,或聚乙烯醇系薄膜2發生皺褶的傾向。捲繞硬度過小地捲繞的話,位於比芯管1下側的上述聚乙烯醇系薄膜2之部分垂下,而會有上述聚乙烯醇系薄膜輥成為偏心的狀態的傾向。另外,由於該偏心,聚乙烯醇系薄膜2之抽出狀態變得不均勻,因此,所製造的偏光膜會有容易發生色斑的傾向,性能會變差。In more detail, in view of making the performance of the polarizing film produced more excellent, the winding hardness of the polyvinyl alcohol-based film roll is preferably in the range of 60 to 95 durometer hardness, particularly preferably 65 durometer hardness. Within the range of ~92, more preferably within the range of 70~90 durometer hardness.
If the winding hardness is too high, the
另外,上述於寬度方向之捲繞硬度的偏差,如前述為硬度計硬度15以下,宜為12以下,特佳為10以下,更佳為8以下。
該捲繞硬度的偏差過大的話,以如此之聚乙烯醇系薄膜輥之聚乙烯醇系薄膜2作為形成材料而製得的偏光膜,於寬度方向之偏光度的偏差變大,性能變差。In addition, the deviation of the winding hardness in the width direction is, as mentioned above, a durometer hardness of 15 or less, preferably 12 or less, particularly preferably 10 or less, more preferably 8 or less.
If the variation in winding hardness is too large, the polarizing film produced by using the polyvinyl alcohol-based
[芯管]
上述芯管1的形狀通常為圓筒狀。該芯管1的材質,例如可列舉鋁、鋁合金、碳、合成樹脂等,該等可單獨使用或倂用2種以上。其中,考量強度的觀點,宜為鋁合金、碳,考量成本的觀點,通常使用鋁合金。又,上述芯管1,如前述,軸方向之長度為3.5m以上,通常使用比起捲繞於該芯管1之聚乙烯醇系薄膜2之寬度更長約0~400mm者。上述圓筒狀之芯管1的直徑(外徑),通常為110~310mm之範圍內,壁厚取決於該芯管1之材質而不同,當其材質為鋁合金時,通常為3~40mm之範圍內。[core tube]
The above-mentioned
[聚乙烯醇系薄膜]
就上述聚乙烯醇系薄膜2而言,一般藉由以聚乙烯醇系樹脂水溶液作為形成材料之連續澆鑄法形成長條的帶狀後,為了使寬度成為設計值,係將兩側端部切斷除去(切去)而製造。
該聚乙烯醇系薄膜2的寬度,如前述,為3.5m以上,考量偏光膜之製造上的觀點,宜為4m以上,特佳為4.2~7.0m之範圍內。亦即,上述寬度過寬的話,在製造偏光膜時,會有難以控制上述聚乙烯醇系薄膜2之抽出,容易發生斷裂的傾向。上述寬度過窄的話,會有難以製造對應於液晶顯示器之大型化的偏光膜的傾向。[Polyvinyl alcohol film]
The polyvinyl alcohol-based
上述聚乙烯醇系薄膜2的長度,如前述,為5000m以上,考量操作上及偏光膜的生產性的觀點,宜為10000m以上,特佳為12000~30000m之範圍內。亦即,上述長度過長的話,上述聚乙烯醇系薄膜輥的外徑及重量變大,因而會有設備負荷變大,且運送效率也降低的傾向。上述長度過短的話,會有偏光膜的生產性降低的傾向。The length of the above-mentioned polyvinyl alcohol-based
上述聚乙烯醇系薄膜2的厚度,如前述,為60μm以下,考量偏光膜之製造上的觀點,宜為55μm以下。厚度的下限值宜為10μm。亦即,上述厚度過厚的話,製得的偏光膜會有收縮力容易變大,難以形成如設計之尺寸的傾向。上述厚度過薄的話,在製造偏光膜時,會有容易發生斷裂的傾向。
上述厚度的調整,例如可藉由調整上述連續澆鑄法中之聚乙烯醇系樹脂水溶液朝澆鑄滾筒噴吐的噴吐量,或調整利用該噴吐製膜而得之薄膜2朝流動方向(MD)或寬度方向(TD)延伸的延伸量等而進行。The thickness of the polyvinyl alcohol-based
考量使所製造之上述偏光膜的性能更加優異的觀點,上述聚乙烯醇系薄膜2之含水率宜為5重量%以下,特佳為0.1~4重量%之範圍內,更佳為0.2~3.5重量%之範圍內。上述含水率過高的話,會有上述聚乙烯醇系薄膜2容易黏連的傾向,上述含水率過低的話,會有上述聚乙烯醇系薄膜2容易被刮傷的傾向,無論何種情形,均容易對偏光膜的性能造成不良影響。
上述含水率的調整,例如可藉由對捲繞前之上述聚乙烯醇系薄膜2進行乾燥或調濕而進行。In view of making the performance of the polarizing film produced more excellent, the moisture content of the polyvinyl alcohol-based
[捲繞機]
接著,針對上述聚乙烯醇系薄膜輥之製造所使用的捲繞機進行說明。
如前述,該捲繞機係用以在製得之長條的聚乙烯醇系薄膜2經切成設計值之寬度後,將其捲繞於圓筒狀之芯管1的機器。[Winding machine]
Next, the winding machine used for manufacture of the said polyvinyl-alcohol-type film roll is demonstrated.
As mentioned above, the winding machine is a machine for winding the obtained long polyvinyl alcohol-based
亦即,如圖2所示,上述捲繞機具備:自由旋轉地支撐上述芯管1的芯管支撐體10、及與受支撐之上述芯管1平行地設置的一對控制輥11、12。又,上述芯管支撐體10具備旋轉驅動上述芯管1的馬達等驅動裝置(未顯示在圖中)。另外,上述捲繞機係使製得之上述聚乙烯醇系薄膜2邊接觸上述一對控制輥11、12中之至少一者邊捲繞於上述芯管1,而製造上述聚乙烯醇系薄膜輥。
此外,圖2中,符號5係為了使製得之長條的聚乙烯醇系薄膜2沿長度方向行進直到上述捲繞機而設置多個(圖2中為3個)的導輥。
又,圖2中,為了使上述導輥5及捲繞機的構成易於理解,在示意性地顯示各構成之主要部分的同時,改變各主要部分(構成)之大小的比例進行圖示。之後的圖3中亦同樣。That is, as shown in FIG. 2, the above-mentioned winding machine is provided with: a core
在該實施形態中,上述芯管支撐體10為臂狀,上述芯管1在該臂狀的前端部分可自由裝卸,且以該臂狀之根部部分為中心,沿著垂直於上述芯管1之軸線的假想平面任意擺動(參照圖2之箭頭R)。該擺動通常藉由馬達進行。
該臂狀之芯管支撐體10的擺動半徑,比起所製造之聚乙烯醇系薄膜輥的半徑更大,通常為1.0~1.5m之範圍內。In this embodiment, the above-mentioned core
上述一對控制輥11、12具備在捲繞開始位於接近上述芯管1之側的第1控制輥11、及位於較遠側的第2控制輥12。該實施形態中,各控制輥11、12以追隨各自的擺臂11a、12a之前端部分自由旋轉的方式安裝,並設置成相互對向的狀態(配置成縱列(tandem)型)。各擺臂11a、12a以根部部分為中心,並沿著垂直於各控制輥11、12的假想平面任意擺動。該擺動各自獨立地進行,上述一對控制輥11、12可各自獨立地進行位置調整。另外,上述擺動通常藉由馬達進行。The pair of control rolls 11 and 12 includes a
各控制輥11、12的材質,例如可列舉碳鋼、不銹鋼等鋼、鋁、鋁合金、碳(碳纖維)等,其中,考量減小控制輥11、12本身的重量及聚乙烯醇系薄膜之張力所致之彎曲的觀點,宜為碳(碳纖維)。就各控制輥11、12的尺寸而言,通常半徑為100~300mm之範圍內,長度為3.5m以上,係待捲繞的聚乙烯醇系薄膜2之寬度以上。對向的控制輥11、12的中心間距離通常為150~700mm之範圍內。上述擺臂11a、12a的擺動半徑比起上述控制輥11、12的半徑更大,通常為200~1000mm之範圍內。The material of each
[聚乙烯醇系薄膜輥之製法] 接著,針對使用了上述捲繞機的上述聚乙烯醇系薄膜輥之製法進行說明。[Manufacturing method of polyvinyl alcohol-based film roll] Next, the manufacturing method of the said polyvinyl-alcohol-type film roll using the said winding machine is demonstrated.
亦即,首先,如圖2所示般,將芯管1安裝於上述芯管支撐體10之前端部分並予以支撐。然後,使上述芯管支撐體10擺動,以使接觸第1控制輥11的聚乙烯醇系薄膜2開始捲繞於上述芯管1之外周面時的上述聚乙烯醇系薄膜2之進入角度α成為2~35°之範圍內,同時使安裝有上述第1控制輥11之擺臂11a擺動,使上述芯管1靠近上述第1控制輥11。於該狀態下,固定上述第1控制輥11的位置(使擺臂11a不擺動)。於該靠近的狀態下,上述芯管1之外周面與上述第1控制輥11之外周面之間的間隙(接近量)宜為2~5mm之範圍內。That is, first, as shown in FIG. 2 , the
又,如後述般,在捲繞中,隨著捲繞於上述芯管1之聚乙烯醇系薄膜2的外徑增加,使上述芯管支撐體10擺動,使上述芯管1慢慢遠離上述第1控制輥11,若以如此方式,則從某時間點開始,待捲繞的聚乙烯醇系薄膜2之進入角度α落在上述範圍(2~35°)外。因此,如圖3所示般,為了將上述進入角度β維持在上述範圍(2~35°)內,從預定的時間點開始,應使聚乙烯醇系薄膜2接觸上述第2控制輥12後,以在不接觸上述第1控制輥11的情況下進行捲繞,而於捲繞開始之前預先調整上述第2控制輥12的位置並固定(使擺臂12a不擺動)。Also, as will be described later, during winding, as the outer diameter of the polyvinyl alcohol-based
如此,於固定上述第1控制輥11及第2控制輥12之位置的狀態下,使上述芯管1旋轉,上述聚乙烯醇系薄膜2開始捲繞於上述芯管1之外周面。In this way, the
從捲繞開始直到上述預定的時間點為止(捲繞初期),如圖2所示,上述聚乙烯醇系薄膜2先接觸上述第2控制輥12,再接觸上述第1控制輥11,之後,捲繞於上述芯管1之外周面。該捲繞中,如前述,隨著捲繞於上述芯管1之聚乙烯醇系薄膜2的外徑增加,使上述芯管支撐體10擺動(參照圖2之箭頭R),使上述芯管1慢慢遠離上述第1控制輥11。From the beginning of winding until the above-mentioned predetermined time point (initial winding), as shown in FIG. Wound on the outer peripheral surface of the above-mentioned
繼續如此之捲繞的話,如圖3所示,從上述預定的時間點開始,上述聚乙烯醇系薄膜2會遠離上述第1控制輥11並不再接觸,接觸上述第2控制輥12後,在不接觸上述第1控制輥11的情況下進行捲繞。該捲繞中的上述進入角度β通常比起捲繞初期的上述進入角度α更大。如此之捲繞會持續到捲繞結束,而獲得目的之上述聚乙烯醇系薄膜輥。If such winding is continued, as shown in FIG. 3 , from the above-mentioned predetermined time point, the above-mentioned polyvinyl alcohol-based
上述聚乙烯醇系薄膜2之捲繞速度,考量使切斷除去(切去)兩側端部後之切斷面的形狀變得良好的觀點,宜為35m/分鐘以上,特佳為40m/分鐘以上,更佳為50~150m/分鐘之範圍內。
上述捲繞速度過慢的話,會有生產效率降低的傾向,過快的話,會有切斷除去(切去)兩側端部後之切斷面的形狀惡化,對偏光膜的性能造成不良影響的傾向。The winding speed of the above-mentioned polyvinyl alcohol-based
上述捲繞中,考量將獲得之聚乙烯醇系薄膜輥之捲繞硬度的偏差控制在硬度計硬度15以下的觀點,上述聚乙烯醇系薄膜2之進入角度α、β為2~35°之範圍內,宜為2~20°之範圍內,特佳為2~10°之範圍內。
上述進入角度α、β過大的話,位於比芯管1下側的上述聚乙烯醇系薄膜2之部分垂下,而會有上述聚乙烯醇系薄膜輥成為偏心的狀態的傾向。另外,由於該偏心,聚乙烯醇系薄膜2之抽出狀態變得不均勻,因此,所製造的偏光膜會有容易發生色斑的傾向,性能會變差。上述進入角度α、β過小的話,捲繞時會有聚乙烯醇系薄膜2容易發生皺褶的傾向。In the above-mentioned winding, the angles α and β of the above-mentioned polyvinyl alcohol-based
又,上述捲繞中,考量容易將上述進入角度α、β維持在上述2~35°之範圍內的觀點,經捲繞的上述聚乙烯醇系薄膜2之外周面與上述第1控制輥11之外周面之間的間隙(接近量)宜維持在2~10mm之範圍內,特佳為2~8mm之範圍內,更佳為2~6mm之範圍內。
其中,上述間隙在上述捲繞初期宜維持在2~5mm之範圍內,在該捲繞初期以後宜維持在6mm以上。
上述間隙過大的話,會有上述聚乙烯醇系薄膜輥成為偏心的狀態的傾向。另外,由於該偏心,聚乙烯醇系薄膜2之抽出狀態變得不均勻,因此,所製造的偏光膜會有容易發生色斑的傾向,性能會變差。上述間隙過小的話,捲繞時會有聚乙烯醇系薄膜2容易發生皺褶的傾向。In addition, in the above-mentioned winding, the outer peripheral surface of the above-mentioned polyvinyl alcohol-based
上述聚乙烯醇系薄膜輥之製法中,考量使獲得之聚乙烯醇系薄膜輥之捲繞硬度落在前述較佳範圍(硬度計硬度60~95)內的觀點,上述聚乙烯醇系薄膜2之捲繞張力宜維持在100~300N/m之範圍內,特佳為120~280N/m之範圍內,更佳為140~260N/m之範圍內。
上述捲繞張力過大的話,會有容易發生因捲緊(winding tightening)所致之皺褶的傾向。上述捲繞張力過小的話,位於比芯管1下側的上述聚乙烯醇系薄膜2之部分垂下,而會有上述聚乙烯醇系薄膜輥成為偏心的狀態的傾向。另外,由於該偏心,聚乙烯醇系薄膜2之抽出狀態變得不均勻,因此,所製造的偏光膜會有容易發生色斑的傾向,性能會變差。
此處,上述捲繞張力,係施加於待捲繞的聚乙烯醇系薄膜2之每1m寬度的張力。該捲繞張力的調整,例如可藉由調整上述芯管1的旋轉扭矩、及上述聚乙烯醇系薄膜2之行進路徑中所設置之張力輥(tension roll)向上述聚乙烯醇系薄膜2施加的負荷等而進行。In the production method of the above-mentioned polyvinyl alcohol-based film roll, the above-mentioned polyvinyl alcohol-based
上述聚乙烯醇系薄膜輥之製法中,藉由上述一對控制輥11、12,將待捲繞的聚乙烯醇系薄膜輥之進入角度α、β維持在2~35°之範圍。藉此,可使獲得之上述聚乙烯醇系薄膜輥的聚乙烯醇系薄膜2之於寬度方向之捲繞硬度的偏差成為硬度計硬度15以下。
如此,在上述聚乙烯醇系薄膜輥之製法中,設置上述一對控制輥11、12,並將上述進入角度α、β維持在2~35°之範圍內係本發明之一大特徵構成。In the manufacturing method of the above-mentioned polyvinyl alcohol-based film roll, the entry angles α, β of the polyvinyl alcohol-based film roll to be wound are maintained in the range of 2-35° by the pair of
另外,上述聚乙烯醇系薄膜輥之製法中,上述一對控制輥11、12可各自獨立地進行位置調整,故上述進入角度α、β的調整自由度高,可進一步優化聚乙烯醇系薄膜輥的狀態(捲繞硬度等)。In addition, in the manufacturing method of the above-mentioned polyvinyl alcohol-based film roll, the position of the pair of
以此種方式製得之上述聚乙烯醇系薄膜輥,如前述,捲繞硬度的偏差小,幾乎沒有皺褶、偏心,故從該聚乙烯醇系薄膜輥抽出的聚乙烯醇系薄膜2沒有皺褶,且可使其抽出狀態均勻。因此,以上述聚乙烯醇系薄膜2作為形成材料製造偏光膜的話,可使該偏光膜成為沒有色斑等的性能優異者。The above-mentioned polyvinyl alcohol-based film roll produced in this way has little variation in winding hardness as described above, and almost no wrinkles or eccentricity, so the polyvinyl alcohol-based
[偏光膜]
上述偏光膜之製造,通常邊使上述聚乙烯醇系薄膜2沿其長度方向行進,邊經由膨潤、染色、硼酸交聯、延伸、洗淨、乾燥等步驟來進行。[Polarizing film]
The production of the above-mentioned polarizing film is usually carried out through steps such as swelling, dyeing, boric acid crosslinking, stretching, washing, and drying while running the above-mentioned polyvinyl alcohol-based
又,製得之上述偏光膜,在其單面或兩面藉由黏接劑貼合光學上等向性的樹脂薄膜作為保護薄膜,可形成偏光板。In addition, the obtained above-mentioned polarizing film can be formed into a polarizing plate by bonding an optically isotropic resin film as a protective film to one or both sides of the obtained polarizing film with an adhesive.
另外,上述偏光膜及偏光板可理想地使用於可攜式資訊終端機、個人電腦、電視、投影機、標示牌、電子桌上計算機、電子時鐘、文字處理機、電子紙、遊戲機、錄影機、照相機、相簿、溫度計、音響、汽車或機械類的計器類等的液晶顯示裝置、太陽眼鏡、防眩眼鏡、立體眼鏡、穿戴式顯示器、顯示元件(CRT、LCD、有機EL、電子紙等)用抗反射層、光通訊設備、醫療設備、建築材料、玩具等。In addition, the above-mentioned polarizing film and polarizing plate can be ideally used in portable information terminals, personal computers, televisions, projectors, signboards, electronic desktop computers, electronic clocks, word processors, electronic paper, game machines, video recording Computers, cameras, photo albums, thermometers, audio, liquid crystal display devices such as automobiles or mechanical meters, sunglasses, anti-glare glasses, three-dimensional glasses, wearable displays, display elements (CRT, LCD, organic EL, electronic paper etc.) with anti-reflection layer, optical communication equipment, medical equipment, building materials, toys, etc.
此外,上述實施形態中,上述一對控制輥11、12的位置調整可藉由擺臂11a、12a的擺動進行,其他方式亦可,例如,亦可隨機地進行位置調整。
[實施例]In addition, in the above embodiment, the position adjustment of the pair of
接著,一併說明實施例與比較例。惟,本發明並不限定於實施例。Next, Examples and Comparative Examples will be described together. However, this invention is not limited to an Example.
[實施例1] 將重量平均分子量142000、皂化度99.8莫耳%之聚乙烯醇系樹脂1000kg、水2500kg、作為塑化劑之甘油100kg加入溶解槽中,邊攪拌邊升溫至140℃,將濃度調整為樹脂濃度25重量%,得到溶解均勻的聚乙烯醇系樹脂水溶液。 然後,將該聚乙烯醇系樹脂水溶液供給至雙軸擠壓機並進行脫泡後,使水溶液溫度成為95℃,從T型狹縫模噴吐口噴吐及流延至表面溫度90℃之澆鑄滾筒而製膜。 然後,將該經製膜之薄膜利用多個金屬加熱輥進行乾燥,使用浮動式乾燥機實施熱處理,形成含水率3重量%、厚度60μm、寬度4.8m、長度5500m的聚乙烯醇系薄膜(連續澆鑄法)。然後,使用切去裝置,將該已形成之聚乙烯醇系薄膜輥的兩側端部切斷除去(切去)而使寬度成為4.5m。 另外,使用上述實施形態之一對控制輥配置成縱列型的捲繞機,與上述實施形態同樣進行,將上述切去後之聚乙烯醇系薄膜中長度5000m捲繞於鋁合金製的圓筒狀芯管(直徑230mm、壁厚15mm、軸方向之長度4.8m)之外周面。如此得到聚乙烯醇系薄膜輥。[Example 1] Add 1,000kg of polyvinyl alcohol-based resin with a weight average molecular weight of 142,000 and a saponification degree of 99.8 mole%, 2,500kg of water, and 100kg of glycerin as a plasticizer into the dissolution tank, and raise the temperature to 140°C while stirring, and adjust the concentration to a resin concentration of 25 % by weight to obtain a homogeneously dissolved polyvinyl alcohol-based resin aqueous solution. Then, after supplying the polyvinyl alcohol-based resin aqueous solution to a twin-screw extruder and degassing, the temperature of the aqueous solution was set at 95°C, and it was sprayed and cast from the discharge port of a T-shaped slot die to a casting drum with a surface temperature of 90°C. Film making. Then, the formed film was dried with a plurality of metal heating rollers, and heat-treated using a floating dryer to form a polyvinyl alcohol-based film (continuous casting method). Then, using a cutting device, the end portions on both sides of the formed polyvinyl alcohol-based film roll were cut and removed (cut off) to a width of 4.5 m. In addition, using one of the above-mentioned winding machines in which the control rolls are arranged in a tandem type, the above-mentioned cut-off polyvinyl alcohol-based film with a length of 5000 m is wound on an aluminum alloy circle in the same manner as in the above-mentioned embodiment. The outer peripheral surface of the cylindrical core tube (diameter 230mm, wall thickness 15mm, axial length 4.8m). In this way, a polyvinyl alcohol-based film roll was obtained.
該實施例1中,捲繞條件設定為如下。 ・捲繞開始之聚乙烯醇系薄膜之進入角度:5°。 ・從捲繞開始至捲繞結束之上述進入角度:5~10°之範圍內。 ・捲繞開始之經捲繞的聚乙烯醇系薄膜之外周面與第1控制輥之外周面之間的間隙(接近量):5mm。 ・捲繞張力:160N/m。 ・捲繞速度:100m/分鐘。In this Example 1, the winding conditions were set as follows. ・Entering angle of polyvinyl alcohol-based film at the beginning of winding: 5°. ・The above entry angle from the start of winding to the end of winding: within the range of 5° to 10°. ・Gap (approach distance) between the outer peripheral surface of the wound polyvinyl alcohol-based film and the outer peripheral surface of the first control roll at the start of winding: 5 mm. ・Winding tension: 160N/m. ・Winding speed: 100m/min.
[實施例2] 將實施例1中藉由連續澆鑄法形成的聚乙烯醇系薄膜的寬度設定為5.0m,長度設定為15500m。又,將切去後的寬度設定為4.8m。另外,將圓筒狀芯管之軸方向之長度設定為5.0m,待捲繞的聚乙烯醇系薄膜之長度設定為15000m,捲繞張力設定為200N/m。除此以外之部分與上述實施例1同樣進行,得到聚乙烯醇系薄膜輥。[Example 2] The width of the polyvinyl alcohol-based film formed by the continuous casting method in Example 1 was set to 5.0 m, and the length was set to 15500 m. Moreover, the width after cutting was set to 4.8m. In addition, the axial length of the cylindrical core tube was set to 5.0 m, the length of the polyvinyl alcohol-based film to be wound was set to 15000 m, and the winding tension was set to 200 N/m. Except for this, it carried out similarly to the said Example 1, and obtained the polyvinyl-alcohol-type film roll.
[實施例3] 利用實施例1中之連續澆鑄法,形成含水率1重量%、厚度45μm、寬度5.0m、長度17500m之聚乙烯醇系薄膜。又,將切去後的寬度設定為4.8m。另外,將圓筒狀芯管之軸方向之長度設定為5.0m,待捲繞的聚乙烯醇系薄膜之長度設定為17000m,捲繞張力設定為200N/m,捲繞速度設定為70m/分鐘。除此以外之部分與上述實施例1同樣進行,得到聚乙烯醇系薄膜輥。[Example 3] Using the continuous casting method in Example 1, a polyvinyl alcohol-based film with a moisture content of 1% by weight, a thickness of 45 μm, a width of 5.0 m, and a length of 17500 m was formed. Moreover, the width after cutting was set to 4.8m. In addition, the axial length of the cylindrical core tube is set to 5.0m, the length of the polyvinyl alcohol-based film to be wound is set to 17000m, the winding tension is set to 200N/m, and the winding speed is set to 70m/min . Except for this, it carried out similarly to the said Example 1, and obtained the polyvinyl-alcohol-type film roll.
[比較例1]
將實施例1中之捲繞機的控制輥設定為1支。又,就捲繞條件而言,將捲繞開始之上述進入角度設定為40°,從捲繞開始至捲繞結束之上述進入角度設定為40~50°,上述接近量設定為15mm,捲繞張力設定為100N/m,捲繞速度設定為80m/分鐘。除此以外之部分與上述實施例1同樣進行,得到聚乙烯醇系薄膜輥。[Comparative Example 1]
Set the control roll of the winding machine among the
>捲繞硬度> 針對上述實施例1~3及比較例1之聚乙烯醇系薄膜輥,進行捲繞硬度測定。 該測定係使用ASKER硬度計JA型(高分子計器公司製),將上述聚乙烯醇系薄膜輥之距離經捲繞的聚乙烯醇系薄膜之寬度方向之一端緣100mm的位置作為起點,於該寬度方向以100mm間隔實施到另一端部。另外,將測得的硬度之平均值定義為上述捲繞硬度,並示於下列表1。>Winding hardness> The winding hardness measurement was performed about the roll of the polyvinyl-alcohol-type film of Examples 1-3 and Comparative Example 1 mentioned above. This measurement uses the Asker Hardness Tester JA type (manufactured by Polymer Meter Instruments Co., Ltd.), and the position 100 mm from the edge of the polyvinyl alcohol-based film roll in the width direction of the above-mentioned polyvinyl alcohol-based film is taken as the starting point. The width direction is carried out to the other end at intervals of 100mm. In addition, the average value of the measured hardness was defined as the above-mentioned winding hardness, and is shown in Table 1 below.
>捲繞硬度的偏差> 將上述測得的硬度之最大值與最小值的差定義為捲繞硬度的偏差,並示於下列表1。>Variation in winding hardness> The difference between the maximum value and the minimum value of the hardness measured above was defined as the deviation of the winding hardness, and is shown in Table 1 below.
>外觀> 目視觀察上述實施例1~3及比較例1之聚乙烯醇系薄膜輥的外觀,依下列基準進行評價,並示於下列表1。 (評價基準) 〇・・・幾乎沒有皺褶、偏心,外觀形狀良好。 ×・・・有明顯的皺褶及偏心,外觀形狀不良。>Appearance> The appearances of the polyvinyl alcohol-based film rolls of Examples 1 to 3 and Comparative Example 1 were visually observed, evaluated according to the following criteria, and are shown in Table 1 below. (evaluation criteria) 〇・・・There are almost no wrinkles or eccentricity, and the appearance is in good shape. ×・・・There are obvious wrinkles and eccentricity, and the appearance is poor.
[表1]
>偏光膜之製造> 從上述實施例1~3及比較例1之聚乙烯醇系薄膜輥抽出聚乙烯醇系薄膜,浸漬於水溫25℃之水槽使其膨潤,同時於流動方向(MD)延伸至1.7倍。然後,浸漬於由碘0.5g/L、碘化鉀30g/L組成的28℃之水溶液中進行染色,同時於流動方向(MD)延伸至1.6倍。然後,浸漬於硼酸40g/L、碘化鉀30g/L之組成的水溶液(55℃)進行硼酸交聯,同時於流動方向(MD)單軸延伸至2.1倍。最後,以碘化鉀水溶液進行洗淨並乾燥,得到總延伸倍率5.8倍的偏光膜。>Manufacture of Polarizing Film> The polyvinyl alcohol-based film was pulled out from the polyvinyl alcohol-based film rolls of Examples 1-3 and Comparative Example 1, immersed in a water tank with a water temperature of 25° C. to swell, and stretched to 1.7 times in the flow direction (MD). Then, it was dipped in an aqueous solution at 28° C. consisting of 0.5 g/L iodine and 30 g/L potassium iodide for dyeing, while stretching to 1.6 times in the flow direction (MD). Then, immerse in an aqueous solution (55° C.) composed of 40 g/L boric acid and 30 g/L potassium iodide to carry out boric acid cross-linking, while extending uniaxially to 2.1 times in the flow direction (MD). Finally, it was washed with an aqueous potassium iodide solution and dried to obtain a polarizing film with a total elongation ratio of 5.8 times.
>偏光度(%)及單體透射率(%)> 從獲得之上述偏光膜之寬度方向的中央部,切出長度4cm×寬度4cm之試驗片,使用自動偏光薄膜測定裝置(日本分光公司製:VAP7070)測定偏光度(%)及單體透射率(%),並示於下列表2。此外,偏光度(%)顯示平均值、最大值、最小值。>Polarization degree (%) and monomer transmittance (%)> A test piece with a length of 4 cm x a width of 4 cm was cut out from the central portion of the obtained polarizing film in the width direction, and the degree of polarization (%) and single transmittance ( %), and are shown in Table 2 below. In addition, the degree of polarization (%) shows an average value, a maximum value, and a minimum value.
>色斑> 從獲得之偏光膜之寬度方向的中央部,切出長度30cm×寬度30cm之試驗片,以45度角夾持在正交偏光鏡(cross nicol)狀態之2片偏光板(單體透射率43.5%、偏光度99.9%)之間,於該狀態使用表面照度14000lx的光箱以透射模式觀察光學上的色斑,依下列基準進行評價,並示於下列表2。 (評價基準) 〇・・・沒有色斑。 △・・・有輕微的色斑。 ×・・・有明顯的色斑。>Stains> Cut out a test piece with a length of 30 cm x a width of 30 cm from the central part of the obtained polarizing film in the width direction, and clamp two polarizing plates (single transmittance 43.5 %, degree of polarization 99.9%), in this state, use a light box with a surface illumination of 14000 lx to observe the optical color spots in transmission mode, evaluate according to the following criteria, and are shown in Table 2 below. (evaluation criteria) 〇・・・No stains. △・・・Slightly stained. ×・・・There are obvious color spots.
[表2]
由上述表1的結果可知,以捲繞硬度的偏差小的方式製得之實施例1~3之聚乙烯醇系薄膜輥的外觀優異(幾乎沒有皺褶、偏心)。另外,由上述表2的結果可知,以從如此之聚乙烯醇系薄膜輥抽出的聚乙烯醇系薄膜作為形成材料而製得的偏光膜,其性能優異(沒有色斑)。 反觀可知不考慮捲繞硬度的偏差而製得之比較例1之聚乙烯醇系薄膜輥的外觀差(觀察到皺褶及偏心)。而且,可知以從如此之聚乙烯醇系薄膜輥抽出的聚乙烯醇系薄膜作為形成材料而製得的偏光膜,其性能差(有色斑)。As can be seen from the results in Table 1 above, the polyvinyl alcohol-based film rolls of Examples 1 to 3 produced with little variation in winding hardness had excellent appearance (few wrinkles and eccentricity). In addition, from the results in Table 2 above, it can be seen that the polarizing film obtained by using the polyvinyl alcohol-based film drawn from such a polyvinyl alcohol-based film roll as a forming material has excellent performance (no color unevenness). In contrast, it can be seen that the polyvinyl alcohol-based film roll of Comparative Example 1 produced without considering the variation in winding hardness had poor appearance (wrinkles and eccentricity were observed). Furthermore, it was found that the performance of the polarizing film produced using the polyvinyl alcohol-based film drawn from such a polyvinyl alcohol-based film roll as a forming material was poor (stained).
上述實施例中顯示了本發明之具體形態,但上述實施例僅限於例示,並非作限定性解釋。對於本領域技術人員而言明顯的各種變形仍意欲包括於本發明之範圍內。 [產業上利用性]In the above-mentioned examples, specific aspects of the present invention were shown, but the above-mentioned examples are only illustrative and should not be construed as limiting. Various modifications obvious to those skilled in the art are still intended to be included within the scope of the present invention. [Industrial Applicability]
本發明之聚乙烯醇系薄膜輥及其製法,即使使捲繞於芯管的聚乙烯醇系薄膜長條化及寬幅化,仍不會發生皺褶、偏心,可利用在製造性能優異的偏光膜。The polyvinyl alcohol-based film roll and its manufacturing method according to the present invention can be used in rolls with excellent manufacturing performance without wrinkling or eccentricity even if the polyvinyl alcohol-based film wound on the core pipe is elongated and widened. Polarizing film.
1:芯管
2:聚乙烯醇系薄膜
5:導輥
10:芯管支撐體
11:第1控制輥
11a:擺臂
12:第2控制輥
12a:擺臂
α:進入角度
β:進入角度
L:假想垂線
R:箭頭1: core tube
2: Polyvinyl alcohol film
5: guide roller
10: Core tube support body
11: The first control roller
11a: arm swing
12: The
[圖1]係示意性地顯示本發明之聚乙烯醇系薄膜輥之一實施形態的立體圖。 [圖2]係示意性地顯示本發明之聚乙烯醇系薄膜輥之製法中之步驟之一實施形態的說明圖。 [圖3]係示意性地顯示接續圖2的步驟的說明圖。[ Fig. 1 ] is a perspective view schematically showing an embodiment of a polyvinyl alcohol-based film roll of the present invention. [ Fig. 2 ] is an explanatory view schematically showing an embodiment of one of the steps in the production method of the polyvinyl alcohol-based film roll of the present invention. [ Fig. 3 ] is an explanatory diagram schematically showing the steps following Fig. 2 .
1:芯管 1: core tube
2:聚乙烯醇系薄膜 2: Polyvinyl alcohol film
5:導輥 5: guide roller
10:芯管支撐體 10: Core tube support body
11:第1控制輥 11: The first control roller
11a:擺臂 11a: arm swing
12:第2控制輥 12: The second control roller
12a:擺臂 12a: arm swing
α:進入角度 α: entry angle
L:假想垂線 L: imaginary vertical line
R:箭頭 R: arrow
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW201618940A (en) * | 2014-07-28 | 2016-06-01 | Sumitomo Chemical Co | Method for producing rolled acrylic resin film and method for producing polarizing plate |
WO2017043514A1 (en) * | 2015-09-11 | 2017-03-16 | 日本合成化学工業株式会社 | Film roll and chemical agent package |
WO2018034182A1 (en) * | 2016-08-18 | 2018-02-22 | 東レ株式会社 | Polypropylene film roll |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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KR102239857B1 (en) * | 2013-08-28 | 2021-04-13 | 미쯔비시 케미컬 주식회사 | Polyvinyl alcohol film roll and polarizing film using same |
JP6627222B2 (en) * | 2015-02-05 | 2020-01-08 | 東レ株式会社 | Method for producing battery separator and wound body of battery separator |
WO2017029881A1 (en) * | 2015-08-18 | 2017-02-23 | 日本合成化学工業株式会社 | Polyvinyl alcohol film, and polarizing film in which same is used |
KR102375984B1 (en) * | 2015-09-02 | 2022-03-17 | 주식회사 쿠라레 | Polyvinyl alcohol film roll |
-
2019
- 2019-09-03 CN CN201980051469.9A patent/CN112533848B/en active Active
- 2019-09-03 JP JP2019548349A patent/JP7334622B2/en active Active
- 2019-09-03 TW TW108131609A patent/TWI795590B/en active
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW201618940A (en) * | 2014-07-28 | 2016-06-01 | Sumitomo Chemical Co | Method for producing rolled acrylic resin film and method for producing polarizing plate |
WO2017043514A1 (en) * | 2015-09-11 | 2017-03-16 | 日本合成化学工業株式会社 | Film roll and chemical agent package |
WO2018034182A1 (en) * | 2016-08-18 | 2018-02-22 | 東レ株式会社 | Polypropylene film roll |
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JP7334622B2 (en) | 2023-08-29 |
TW202021894A (en) | 2020-06-16 |
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JPWO2020054509A1 (en) | 2021-08-30 |
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