201043560 六、發明說明： * 【發明所屬之技術領域】 . 本發明係關於使用在液晶顯示裝置的偏光板用保護膜 、相位差膜、視角擴大膜、使用於電漿顯示裝置等之各種 影像顯示裝置的防反射膜等各種功能膜也可以利用的光學 膜之製造方法，藉由前述製造方法所得到的光學膜、使用 於前述光學膜的偏光板、及具備前述偏光板的液晶顯示裝 Ο 置。 【先前技術】 _ 影像顯示裝置，特別是液晶顯示裝置，藉由其畫質或 - 高精細化技術等的提高，變成了被廣爲利用。此外，液晶 ' 顯示裝置，特別是作爲電視收訊裝置使用的液晶顯示裝置 ，進而被要求大畫面化及高畫質化。因此，液晶顯示裝置 所具備的光學膜，例如偏光板用保護膜等，不僅要提高視 〇 覺確認性，對應於大畫面化，對於橫向的廣寬幅化的要求 也越來越高。接著，爲了對應於液晶顯示裝置的降低成本 或液晶顯示裝置的要求提高等，也開始要求提高光學膜的 生產效率。 爲了提高光學膜的生產效率，考慮連續生產光學膜。 作爲連續生產光學膜的方法，例如，可以舉出溶液流延製 ' 膜法及融溶流延製膜法等。所謂溶液流延製膜法，係把將 原料樹脂溶解於溶媒的樹脂溶液，流延於移動的支撐體上 ，把乾燥到某種程度而得的膜由支撐體剝離，而藉由以搬 -5- 201043560 送輥搬送剝離的膜同時使其乾燥，以製造樹脂膜的方法。 此外，所謂融溶流延製膜法，係把將原料樹脂加熱融溶的 樹脂溶液流延於支撐體上，把冷卻固化到某種程度而得的 膜由支撐體剝離，藉由以搬送輥搬送剝離的膜同時進而使 其冷卻固化，以製造樹脂膜的方法。 藉由如前述的方法所得的樹脂膜，於搬送中會有在端 部產生捲曲或皺紋等的場合。這樣的場合，爲了要把所得 到的樹脂膜作爲光學膜利用，會有若不另行裁斷膜端部， 就會導致生產效率低下的問題。進而，在如前述的方法， 特別是在製造寬寬幅化的樹脂膜之際，有在樹脂膜之搬送 中，會由於樹脂膜的端部往搬送輥折入等，而使樹脂膜的 製造停止之虞的問題。 爲了解消這些問題，例如，在由支撐體剝離樹脂膜後 ，直到使樹脂膜作爲光學膜而被捲取成卷狀爲止的特定位 置，搬送樹脂膜同時以修整（trimming )刃進行裁斷（進 行修整）。亦即，在樹脂膜的製造中，藉由裁斷端部，分 離裁斷的端部膜而把殘存的膜作爲光學膜來利用。 然而，裁斷後的端部膜的搬送若不能圓滑地的進行， 對裁斷前的樹脂膜的搬送或分離端部膜後的光學膜的搬送 性會有影響。具體而言，例如，端部膜在搬送中破斷，或 者是端部膜偏離特定的搬送路徑的話，即使以使不偏離特 定的搬送路徑的方式在配管內搬送，也會由於在配管內端 部膜阻塞等而使得裁斷後的端部膜的搬送無法圓滑地進行 。接著，由於如此般端部膜的搬送不是圓滑地進行，例如 -6- 201043560 會發生由端部膜分離之後的光學膜等的張力降低，妨礙光 • 學膜的搬送等問題。 . 作爲裁斷這樣的膜的端部的從前的方法，具體而言， 例如可以舉出下列專利文獻1〜3所記載之方法。 在下述專利文獻1，記載著自動處理在移動方向裁斷 移動的寬寬幅網（web )得到具有所要的寬幅的複數個窄 寬幅網時產生的耳（端部膜）的裁斷耳自動處理裝置；其 Q 係使用具備可在前述移動的寬寬幅網的寬幅方向上移動， 於寬幅方向切斷前述裁斷耳的耳切斷手段，及把藉由該耳 切斷手段所切斷的前述裁斷耳由前述寬寬幅網拉離而搬送 . 的’可在前述移動的寬寬幅網的寬幅方向上移動的耳搬送 手段’及因應於隨著前述寬寬幅網的寬幅及前述被裁斷的 窄寬幅網的寬幅及數目而有所不同的前述裁斷耳的位置， 決定前述耳切斷手段及前述耳搬送手段的位置之控制手段 而構成的裁斷耳自動處理裝置的方法。 Ο 根據專利文獻1，揭示著因爲具備隨著裁斷耳的位置 而定位前述耳切斷手段及前述耳搬送手段的控制手段，所 以對於原版（樹脂膜）的寬幅等之多樣變化可以自動對應 。亦即，可以藉由樹脂膜的寬幅等而自動改變樹脂膜的切 斷位置，可以安定地進行樹脂膜的裁斷。 此外，於下述專利文獻2，記載著具有以長尺寸狀風 ' 送從連續被搬送的膜切斷的膜側端部（端部膜）的第1步 驟’使用前述第1步驟使前述側端部往回收部風送的方法 ’設有供在前述第1步驟挾持前述側端部之用的輥對，被 201043560 挾持於前述輥對之前的前述側端部，於其長邊方向被施加 3N/ m2以上45N/ m2以下的張力的風送方法。 根據專利文獻2，藉由以輥對挾持由膜所裁斷的端部 膜，施加一定的張力，可以使從膜裁斷出端部膜起’直到 回收端部膜爲止之風送路徑不阻塞’而風送端部膜。 此外，在下述專利文獻3，記載著由導引薄片狀物的 導引輥、沿著薄片狀物的移動方向切割前述薄片狀物的兩 端部附近的修整刀片、設於前述導引輥的下游，在該邊緣 的寬幅方向切斷以前述修整刀片切斷的邊緣（端部膜）的 橫切（traverse )刀片、抽吸/排出被切斷於前述寬幅方 向的邊緣的風送裝置所構成的薄片狀物之邊緣修整裝置， 以及使用在前述導引輥與前述風送裝置之間，中介設置供 把被切斷於前述寬幅方向的邊緣搬送至前述風送裝置之用 的導引單元，該導引單元，於其表面設有對前述薄片狀物 ，由該薄片狀物表面朝向下游方向以3〜45°之噴射角度噴 射壓縮空氣的狹縫之外殼，及對前述外殼供給壓縮空氣的 壓縮空氣供給手段所構成的薄板狀物的邊緣修整裝置的方 法。 根據專利文獻3，揭示著不管薄片狀物的厚度爲何， 其邊緣修整都可以自動進行，此外，可以使被裁斷的邊緣 (端部膜）平滑地搬送至抽吸盒內，可以達成自動化。 [先前技術文獻] [專利文獻] [專利文獻1]日本專利特開平8-25 7990號公報 201043560 [專利文獻2]日本專利特開2005-238801號公報 [專利文獻3 ]日本專利特開平5 - 1 3 1 3 9 8號公報 【發明內容】 本發明目的在於提供於搬送膜，同時裁斷膜的端部， 製造光學膜的方法’係藉由分離前述端部膜而得的光學膜 被圓滑地搬送之生產效率高的光學膜之製造方法。 〇 本發明之一個態樣’係具備：搬送膜同時裁斷垂直於 前述膜的搬送方向的方向上之至少一方之端部，藉由分離 被裁斷的端部膜，形成光學膜的裁斷步驟，及把被分離的 . 端部膜插入配管內，藉由風送在前述配管內搬送的搬送步 驟；於前述搬送步驟，使用於前述風送的風送風之風速， 係由前述配管的上游側起往下游側變快爲其特徵之光學膜 之製造方法。 此外，本發明之另一態樣，係藉由前述光學膜之製造 〇 方法所得到的光學膜。 此外，本發明之另一態樣，係具備偏光元件、被配置 於前述偏光元件之至少一方的表面上之透明保護膜的偏光 板，其中前述透明保護膜是前述光學膜爲其特徵之偏光板 〇 此外，本發明之另一態樣，係具備液晶胞、及以挾住 ' 前述液晶胞的方式被配置的2枚偏光板之液晶顯示裝置， 其特徵爲：前述2枚偏光板之中至少一方，係前述偏光板 -9 - 201043560 本發明之目的、特徵、％樣及優點，可藉由以下之詳 細記載與附圖而更爲清楚。 【實施方式】 根據本案發明人等的檢討’在專利文獻1所記載的方 法’即使可以安定地進行樹脂膜的载斷，也如前述般，會 有在配管內端部膜塞住的情形。而如果裁斷後的端部膜之 搬送不hS圓滑地進行的g舌’由該情形會產生光學膜不能圓 滑地搬送等問題。 此外’在專利文獻2所記載的方法，會有對膜施加的 張力過強，而使膜破斷之虞。此膜的破斷，特別是容易產 生於薄膜狀膜或拉伸強度很低的膜的場合。此外，在膜破 斷的場合’被搬送於風送路徑內的端部膜的下游側端部成 爲自由端，所以容易受到風送路徑內的風送風的影響，容 易大幅拍黏（拍擊黏住）。進而，來自在配管內切斷端部 膜的切斷裝置的振動，容易傳達至端部膜，使得端部膜更 容易拍黏。如此般端部膜大幅拍黏的場合，會有端部膜阻 塞或使端部膜更進一步發生破斷的問題。 此外，在專利文獻3所記載的方法，採取由配管的上 游側往端部膜，以某個角度吹風的方法，但在下游側端部 膜變成容易大幅拍黏。如此般端部膜大幅拍黏的場合，會 有端部膜阻塞或使端部膜更進一步發生破斷的問題。特別 是，藉由被稱爲張布機（tenter )的膜延伸裝置使膜延伸 後，裁斷膜的端部的場合，於張布機以夾子把持住膜導致 -10- 201043560 的張布夾持變形，使得在被裁斷的端部膜表面被形成凹凸 * ，由於凹凸而大幅受到風送風的阻力，所以會有端部膜的 . 搬送更難變得圓滑的問題。 本發明係根據如前述般的檢討結果而發明的。以下’ 說明相關於本發明的光學膜之製造方法的實施型態，但本 發明並不被限定於這些說明。 相關於本實施型態的光學膜之製造方法，係具備：搬 Q 送膜同時裁斷垂直於前述膜的搬送方向的方向上之至少一 方之端部，藉由分離被裁斷的端部膜，形成光學膜的裁斷 步驟，及把被分離的端部膜插入配管內，藉由風送在前述 配管內搬送的搬送步驟；於前述搬送步驟，使用於前述風 送的風送風之風速，係由前述配管的上游側起往下游側變 快。 根據前述般的構成，可以搬送膜，同時裁斷膜的端部 ’製造光學膜，所以可以連續生產光學膜。接著，於這樣 〇 的光學膜的連續生產，可以提供藉由分離被裁斷的端部膜 而得的光學膜圓滑地被搬送之生產效率高的光學膜之製造 方法。 此情形可認爲是根據以下所述內容。 首先，被裁斷的端部膜被插入配管內，搬送於前述配 管內，所以即使是連續生產光學膜的場合，也應該可抑制 ' 前述端部膜偏離特定的搬送路徑。 此外，搬送於前述配管內的端部膜，一般而言，有從 前述配管上游側起越往下游側，拍黏變得越大的傾向。端 -11 - 201043560 部膜的拍黏很大時，會阻礙端部膜的圓 分離端部膜而得的光學膜的圓滑的搬送 此拍黏，全體提高風送風的風速時，可 有產生端部膜破斷的傾向。端部膜破斷 端部膜的圓滑搬送。在此，藉由使搬送 用的風送風的風速，由前述配管的上游 ，即使不全體提尚風送風的風速，在拍 也應該可以抑制端部膜的拍黏的方式使 前述配管的中央部。如此般藉由朝向前 風送風，應該可以有效果地抑制拍黏。 提高風送風的風速，所以也應該可以抑 由以上情形’應該可以使搬送於前述配 地搬送。 亦即’因爲可以抑制由於端部膜不 致的光學膜搬送被阻礙，所以應該可提 裁斷膜的端部，而製造光學膜的方法， 端部膜所得到的光學膜，被圓滑地搬送 學膜之製造方法。 接著’最好是進而具備搬送前述端 垂直刖述端部膜的搬送方向之方向上的 相關於本實施型態的光學膜之製造 前述裁斷步驟、及前述搬送步驟者即可 具體而言，例如，可以舉出於溶液流延 製膜法等，由支撐體剝離膜後，到直到 滑搬送，阻礙藉由 。接著，爲了抑制 以抑制拍黏，但是 的場合，更爲阻礙 前述端部膜時所使 側起往下游側變快 黏變大的下游側， 風送風的方向朝向 述配管的中央部的 進而，因不整體地 制端部膜的破斷。 管內的端部膜圓滑 能圓滑地搬送所導 供於搬送膜的同時 其藉由使分離前述 之生產效率高的光 部膜，同時切斷於 切斷步驟。 方法，只要是具備 ，沒有特別限定。 製膜法及融溶流延 捲曲爲卷狀爲止的 -12- 201043560 特定位置上，施以前述裁斷步驟製造光學膜的方法等。 . (溶液流延製膜法） 首先，說明藉由溶液流延製膜法製造光學膜的場合（ 第1實施型態）。 相關於第1實施型態的光學膜之製造方法，具備使含 有透明性樹脂的樹脂溶液（塗料）流延於移動的支撐體上 0 形成膜之流延步驟，使前述膜由前述支撐體剝離的剝離步 驟，延伸剝離的膜之延伸步驟，及把延伸的膜捲取成卷狀 的捲取步驟；前述裁斷步驟，係在前述剝離步驟與前述捲 . 取步驟之間進行的。例如，藉由圖1所示的光學膜之製造 裝置來進行。又，作爲光學膜之製造裝置，只要是進行前 述各步驟者，不特別限於圖1所示者，亦可爲其他種構成 。此外，此處的膜，係被流延於支撐體上的塗料所構成的 流延膜（網，web)在支撐體上乾燥，成爲應由支撐體剝離 〇 的狀態以後者。 圖〗係顯示根據溶液流延製膜法之光學膜的製造裝置 11的基本構成之槪略圖。光學膜之製造裝置11，具備無 端皮帶支撐體1 2、流延模1 3、剝離輥14、延伸裝置1 5、 裁斷裝置16、乾燥裝置17及捲取裝置18等。前述流延模 1 3，使溶解透明性樹脂的樹脂溶液（塗料）1 9流延於無端 皮帶支撐體12的表面上。前述無端皮帶支撐體12，形成 從前述流延模1 3所流延的塗料1 9所構成的網（web )， 藉由搬送同時使其乾燥而成爲膜。前述剝離輥1 4，把膜由 -13- 201043560 無端皮帶支撐體1 2剝離。前述延伸裝置1 5，延伸被剝離 的膜。前述乾燥裝置17，以搬送輥搬送被延伸的膜’同時 使其乾燥。前述捲取裝置18，把乾燥的膜捲取爲卷狀，成 爲膜卷。此外，前述裁斷裝置16，如圖1所示，被設於前 述剝離輥1 4與前述延伸裝置丨5之間，前述延伸裝置1 5 與前述乾燥裝置17之間，前述乾燥裝置17與前述捲取裝 置18之間。接著，前述裁斷裝置16，裁斷在各處所之膜 的端部，對裁斷的端部膜施以特定的處理。 此外，相關於本實施型態的光學膜之製造方法，係前 述裁斷裝置16，如圖1所示，不限定於設在3處所的製造 裝置η ’亦可爲1處所、或2處所、或4處所以上。 前述流延模1 3 ’如圖1所示，由被接續於前述流延模 1 3的上端部之塗料供給管供給塗料〗9。接著，該被供給 的塗料由前述流延模13往前述無端皮帶支撐體12吐出， 於前述無端皮帶支撐體12上形成網（web)。 前述無端皮帶支撐體12，如圖1所示，係表面爲鏡面 的無限移動的金屬製之無端皮帶。作爲前述皮帶，由膜的 剝離性的觀點來看’例如以使用不銹鋼等所構成的皮帶較 佳。藉由前述流延模1 3流延的流延膜的寬幅，沒有特別 限定，但由有效利用無端皮帶支撐體1 2的寬幅的觀點來 看，最好是對無端皮帶支撐體12的寬幅爲8〇〜99%。接 著，爲了最終獲得1000〜4〇OOmm寬幅的光學膜，無端皮 帶支撐體12的寬幅，最好爲18〇〇〜5〇〇〇mm。此外，替代 無端皮帶支撐體，使用表面爲鏡面的旋轉的金屬製之滾筒 -14- 201043560 (無端滾筒支撐體）亦可。 * 接著，前述無端皮帶支撐體12，搬送被形成於其表面 . 上的流延膜（網），同時使塗料中的溶媒乾燥。前述乾燥 ，例如係藉由加熱無端皮帶支撐體1 2 ’或者對網吹以熱風 而進行的。此時，網的溫度，隨著塗料的溶液而不同，考 慮伴隨著溶媒的蒸發時間之搬送速度或生產性等，以-5〜 之範圍較佳，更佳者爲0〜60°C之範圍。網的溫度越 0 高溶媒的乾燥速度可以加快所以較佳，但是太高的話，會 有起泡，或是平面性劣化的傾向。 加熱無端皮帶支撐體1 2的場合，可以舉出例如以紅 外線加熱器加熱無端皮帶支撐體1 2上的網的方法，以紅 外線加熱器加熱無端皮帶支撐體1 2的背面的方法，或是 對無端皮帶支撐體1 2的背面吹以加熱風進行加熱的方法 等，可因應必要而適當選擇。 此外，吹以加熱風的場合，該加熱風的風壓，在考慮 〇 溶媒蒸發的均一性下，以50〜5000Pa較佳。加熱風的溫 度，亦可以一定的溫度乾燥，亦可分數個階段供給在無端 皮帶支撐體12的移動方向。 無端皮帶支撐體1 2上流延塗料之後，直到由無端皮 帶支撐體1 2剝離網爲止之間的時間，隨著製作的光學膜 的膜厚、使用的溶媒而有所不同，但是考慮由無端皮帶支 ' 撐體12之剝離性，以0.5〜5分鐘的範圍較佳。 根據前述無端皮帶支撐體1 2之流延膜的搬送速度， 沒有特別限定，但由生產性的觀點來看，例如以50〜 -15- 201043560 2 0 0m/分鐘程度爲較佳。此外，對前述無 12的移動速度之，流延膜的搬送速度之. draft ratio)爲 0.8〜1.2程度爲較佳。前述 圍內的話，可以安定形成流延膜。例如，拉 ，會有發生流延膜往寬幅方向縮小之稱爲頸 現象的傾向，如此一來，變得無法形成寬幅 前述剝離輥1 4，接於無端皮帶支撐體1 流延之側的表面，藉由加壓於無端皮帶支撐 被乾燥的網（膜）剝離。從無端皮帶支撐體 ，隨著剝離張力與其後的搬送張力使得膜延 方向（加工方向；Machine Direction: MD ，由無端皮帶支撐體1 2剝離膜時的剝離張 例如以50〜400N/m2爲較佳。 此外，在考慮從無端皮帶支撐體1 2之 時的殘留溶媒量，剝離後的搬送性，搬送· 的光學膜的物理特性等，將膜由無端皮帶支 時之膜的所有殘留溶媒量，以30〜200質量 前述裁斷裝置1 6，裁斷膜的約略垂直於 向（寬幅方向）之至少一方的端部，藉由對 膜施以特定的處理使成爲細片。前述裁斷裝 言’例如係圖2所示者。又，圖2，係顯牙 1 6的周邊的槪略立體圖。 前述裁斷裝置16，具備未圖示的修整 53、導引輥對42、第1配管43、切斷裝置 端皮帶支撐體 比（拉伸比， 拉伸比在此範 伸比太大的話 縮（necking) 的膜。 2的塗料1 9被 體12側，使 1 2剝離膜時 伸於膜的搬送 方向）。因此 力及搬送張力 剝離性，剝離 乾燥後所完成 撐體1 2剝離 百分比爲佳。 •搬送方向的方 被裁斷的端部 置16，具體而 :前述裁斷裝置 刀片、導引輥 44、以及第2 -16- 201043560 配管45等。前述修整刀片，切取被搬送來的膜41的與搬 送方向約略垂直的方向（寬幅方向）的端部’以使被切取 . 的膜的剩餘部分成爲出貨製品之光學膜的方式進行裁斷。 此時被切取的端部，作爲端部膜46來處理。前述導引輥 53以及前述導引輥對42，把前述端部膜46由前述第1配 管43的上游側端部導引往第1配管43內。前述第1配管 43，抽吸前述端部膜46，藉由風送搬送至前述切斷裝置 0 44。前述切斷裝置44，被連接於前述第1配管43的下游 側端部，在約略垂直於前述端部膜46的搬送方向的方向 上細細切斷，使成爲細片47。前述第2配管45，其一方 端部被連接於前述切斷裝置44，藉由風送把前述細片47 • 搬送至被連接於該另一方的端部之貯留前述細片47之用 ' 的貯留槽（未圖示）等。 前述修整刀片，只要是可以切取被搬送來的膜的端部 即可，沒有特別限定。作爲前述修整刀片，爲了適切地切 〇 取膜的端部，最好是可以任意調整對膜的切入深度，例如 ，可以舉出具備由上圓刃與下圓刃所構成的切斷刃之旋轉 圓板式者或者刀式者。 前述導引輥53以及前述導引輥對42，只要可以把前 述端部膜46導引至第1配管43內即可，沒有特別限定。 作爲前述導引輥5 3，只要可以把前述端部膜46由前述第 ' 1配管43之上游側端部導引至第1配管43內即可，沒有 特別限定，可以舉出從動於前述端部膜46的搬送之從動 輥等。作爲前述導引輥對42，例如爲挾持前述端部膜46 -17- 201043560 者，且至少一方之輥，係對被挾持之前的端部膜46在搬 送方向上施加張力的驅動輥。此外，前述導引輥對42，亦 可係以從動於端部膜4 6的搬送的從動輥所構成者，以使 用如前述般的驅動輥者，可以對被導引於第1配管43內 之前的端部膜46施加張力於搬送方向，藉此可以抑制端 部膜46的拍黏的產生所以較佳。此外，前述導引輥對42 之輥，以其外周面爲橡膠製或者被形成供抑制前述端部膜 滑動之用的凹凸之金屬製爲佳。 前述第1配管4 3，於下游側端部被接續著前述切斷裝 置44’前述第1配管43內，朝向前述切斷裝置44被抽吸 。亦即，前述第1配管43，係供把被插入第1配管43的 端部膜46，藉由風送搬送至前述切斷裝置44者。如此般 ，被裁斷的端部膜46被插入前述第1配管43內，搬送於 前述第1配管43內，所以即使是連續生產光學膜的場合 ’也應該可抑制前述端部膜46偏離特定的搬送路徑。接 著’此抽吸’係使第1配管43內產生朝向前述切斷裝置 44的風送風者。具體而言，例如，於前述第1配管43的 下游側’在透過前述切斷裝置44連接的前述第2配管45 內’藉由空氣壓縮機（壓縮機）等，使空氣朝向下游側流 入藉以產生前述風送風亦可。 接著’前述第1配管43內，使用於前述風送的風送 風的風速，係以從前述第1配管43的上游側起朝向下游 側變快的方式被抽吸。作爲如此般由上游側往下游側使風 送風的風速提高的方法，沒有特別限定。具體而言，例如 -18 - 201043560 ，於前述第1配管43，設風速調整閥或風的吸入口亦可， * 以使前述第1配管43的前述風送風流通的部分的剖面積 . ，由上游側往下游側變小的方式爲較佳。藉由如此進行， 可以不須另行準備供由上游側往下游側提高風送風的風速 之手段，例如，不需另行準備風速調整閥或風的吸入口， 就可以提高由前述第1配管43的上游側往下游側的風送 風的風速。此外，前述第1配管43的前述下游側端部之 0 剖面積對前述上游側端部之剖面積的比率（下游側/上游 側）最好是10〜95%，又以15〜85%更佳。又，前述風送 風的風速，可以使用風速計，具體而言，使用（股）日吉 製造的混合式風速計DP 70等來進行測定。 . 藉由如前述般使下游側的風速比上游側更高，使被裁 ' 斷的端部膜46圓滑地被搬送於第1配管43內，因而，可 以圓滑地搬送藉由分離前述端部膜46所得的光學膜。 此情形可認爲是根據以下所述內容。 〇 一般而言，被搬送於配管內的如端部膜這樣的長尺寸 膜，由配管的上游側起越往下游側拍黏的傾向越大。如此 般當端部膜的拍黏很大時，會阻礙端部膜的圓滑搬送，阻 礙藉由分離端部膜而得的光學膜的圓滑的搬送。接著，爲 了抑制此拍黏，而全體提高風送風的風速的話，可以抑制 拍黏，但是有產生端部膜破斷的傾向。端部膜破斷的場合 ' ，更爲阻礙端部膜的圓滑搬送。 此處，使搬送前述端部膜46時使用的風送風之風速 ，成爲由前述第1配管43的上游側起朝向下游側變快。 -19- 201043560 具體而言，例如，使用下游側的剖面積比上游側的剖面積 更小的第1配管43。藉由如此’風送風的風速並不整體地 提高，而於拍黏變大的下游側’風送風的方向應該是以抑 制端部膜的拍黏的方式朝向前述配管的中央部。如此般藉 由朝向前述配管的中央部的風送風’應該可以有效果地抑 制拍黏。進而，因不整體地提高風送風的風速，所以也應 該可以抑制端部膜的破斷。由以上情形，應該可以使搬送 於前述第1配管43內的端部膜46圓滑地搬送。因而，可 以抑制由於前述端部膜46的搬送不圓滑地進行而導致光 學膜的搬送被阻礙的情形，於搬送膜同時裁斷膜的端部， 製造光學膜的連續生產中，光學膜被圓滑地搬送成爲生產 效率高者。 此外，前述風送風之前述第1配管43的上游側端部 之風速與前述第1配管43之下游側端部的風速之風速差 ，最好是0.5〜50m/秒。藉由如此，可以不提高前述風送 風的全體的風速，而在拍黏有變大傾向的下游側，有效地 抑制因快速的風送風導致的拍黏。亦即，可以更爲抑制端 部膜的拍黏等，使端部膜可以更圓滑地搬送，可以圓滑地 搬送藉由分離端部膜所得到的光學膜。 前述切斷裝置44，只要是被連接於前述第1配管43 的下游側端部’在約略垂直於前述端部膜46的搬送方向 的方向上細細切斷，使前述端部膜46成爲細片47者即可 ’沒有特別限定。具體而言，例如，可以舉出具備如圖3 所示那樣的旋轉刃51與未圖示的固定刃，使在前述第1 -20- 201043560 配管43內搬送來的長尺寸的端部膜’藉由挟入旋轉的 • 轉刃51與固定刃，而可以連續進行切斷者。更具體地 . ，例如前述旋轉刃5 1，具備以沿著在前述第1配管4 3 搬送來的端部膜46的寬幅方向的方式配置的旋轉軸’ 在前述旋轉軸的圓周面上沿著旋轉軸方向延伸的複數之 尺寸狀之刃。此外，前述固定刃’係對向於前述旋轉刃 的旋轉軸的周面而設置的，藉由前述旋轉刃51的旋轉 0 而接近前述旋轉刃51的長尺寸狀之刃。前述切斷裝置 ，藉由使前述旋轉刃51旋轉’前述旋轉刃51之長尺寸 之刃與固定刃每隔特定間隔就會接近’藉由旋轉的旋轉 51與固定刃挟入長尺寸狀的端部膜’而可以連續地進行 . 斷。又，圖3，係顯示前述切斷裝置44的周邊的槪略圖 此外，如圖3所示’前述切斷裝置4 4之[fij述風送 流通的部分之剖面積，最好是比前述第1配管43的下 側之前述風送風流通的部分的剖面積變得更小。縮小前 Ο 切斷裝置44之前述風送風流通的部分的剖面積的方法 沒有特別限定，具體而言，可以如圖3 ( a )所示，藉由 前述旋轉刃51的旋轉軸變粗，而使前述切斷裝置44的 述風送風流通的部分的剖面積縮小，亦可以如圖3 ( b ) 示，使前述切斷裝置44自身縮小，亦即縮小收容前述 轉刃51及前述固定刃的筐體亦可。藉由如此，被接續 ' 前述第1配管43的下游側端部的前述切斷裝置44之前 風送風流通的部分的剖面積會變小’所以則述風送所使 的風送風的風速，可以由前述第1配管43的上游側起 旋 說 內 及 長 5 1 » 44 狀 刃 切 〇 風 游 述 ， 使 ^」· 刖 所 旋 於 述 用 越 -21 - 201043560 往下游側變得越快。此外，前述端部膜46，也會由於根據 前述切斷裝置44的切斷步驟而產生拍黏，該拍黏阻礙前 述端部膜46的圓滑搬送。在此，藉由使前述切斷裝置44 成爲如前述般的構成，可以抑制根據前述切斷裝置44之 切斷步驟所產生的前述端部膜46的拍黏。亦即，可以更 爲抑制前述端部膜46的拍黏，可以使藉由分離前述端部 膜46所得到的光學膜更平滑地搬送。 前述第2配管45，被接續於前述切斷裝置44，前述 第2配管45內，從前述切斷裝置44，朝向例如貯留前述 細片47之用的貯留槽等被抽吸。亦即，前述第2配管45 ，把藉由前述切斷裝置44切斷的前述細片47藉由風送， 搬送至供貯留前述細片47之用的貯留槽等。接著，被貯 留於貯留槽等的前述細片47，再度作爲膜原料使用亦可。 那時，以使前述細片47破碎成更細爲較佳。 此外，前述裁斷裝置1 6，分別被設於前述剝離輥1 4 與前述延伸裝置1 5之間，前述延伸裝置1 5與前述乾燥裝 置1 7之間，前述乾燥裝置1 7與前述捲取裝置1 8之間。 前述延伸裝置15，使從無端皮帶支撐體12剝離的膜 (以前述裁斷裝置1 6裁斷端部的膜），延伸於與網的搬 送方向直交的方向（橫斷方向；Transverse Direction: TD 方向）上。具體而言，藉由以握把等把持垂直於膜的搬送 方向的方向之兩端部，使對向的握把間的距離增大，而延 伸於TD方向。又’在第1實施型態，係具備延伸裝置1 5 ’但不具備亦可。此外，藉由前述延伸裝置1 5延伸的膜 -22- 201043560 之所有殘留溶媒量，沒有特別限定，但由根據前述裁斷裝 • 置1 6的裁斷性的觀點來看，例如以1〜20質量百分比較 _ 佳。又’不具備前述延伸裝置15的場合，直到對前述裁 斷裝置16供給膜爲止’膜之所有殘留溶媒量以成爲 質量百分比爲佳。 前述乾燥裝置17’具備複數之搬送輥，在該輥之間搬 送膜時使膜乾燥。此時，單獨使用加熱空氣、紅外線等進 ^ 行乾燥亦可，並用加熱空氣與紅外線進行乾燥亦可。由簡 便性的觀點來看使用加熱空氣較佳。作爲乾燥溫度，隨著 膜的殘留溶媒量不同，適切的溫度也不同，考慮乾燥時間 ，收縮差異，伸縮量的安定性等，在3 0〜1 8 0 °c之範圍隨 著殘留溶媒量而適當選擇而決定即可。此外，以一定的溫 度進行乾燥亦可，分爲2〜4個階段的溫度，分爲數個階 段的溫度進行乾燥亦可。此外，搬送於乾燥裝置1 7內時 ，使膜延伸於MD方向亦可。在前述乾燥裝置1 7之乾燥 〇 處理後之膜的殘留溶媒量，考慮乾燥步驟的負荷、保存時 的尺寸安定性伸縮率等，以0.0 1〜1 5質量百分比較佳。 前述捲取裝置18，以前述乾燥裝置17把成爲特定的 殘留溶媒量的膜於捲芯捲爲必要量的長度。又，捲取時的 溫度，爲了防止捲取後的收縮導致劃傷、捲取鬆弛等，最 好是冷卻至室溫爲佳。使用的捲取機沒有特別的限定，用 " 一般使用的機器即可，可以採用定張力法、定扭矩法、梯 度張力法、內部應力一定的程式張力控制法等捲取方法來 進行捲取。 -23- 201043560 相關於本第1實施型態的光學膜之製造裝置u，將前 述裁斷裝置16設置於前述剝離輥14與前述延伸裝置15 之間、前述延伸裝置15與前述乾燥裝置17之間、前述乾 燥裝置1 7與前述捲取裝置〗8之間，但如前所述，並不以 此爲限。 一般而言，膜會隨著收縮或乾燥等而改變膜的寬幅。 對此，前述延伸裝置15或前述乾燥裝置17等之各種裝置 ，亦有對膜寬幅有所限制的情形。此處，將前述裁斷裝置 16設置3處以上的話，即使膜隨著收縮或乾燥等而改變膜 的寬幅，也可以使其成爲配合於各種裝置的膜寬幅。具體 而言，例如，以前述剝離輥1 4剝離的膜，特別會由於熱 收縮而改變膜的寬幅，但藉由在前述剝離輥14與前述延 伸裝置15之間設置前述裁斷裝置16，可以在把膜搬送至 前述延伸裝置15之前，調整膜寬幅。此外，藉由在前述 延伸裝置15與前述乾燥裝置17之間設置前述裁斷裝置16 ，可以裁斷藉由根據前述延伸裝置15的延伸步驟而變形 的例如有握把痕跡的端部。此外，藉由前述乾燥裝置17 與前述捲取裝置18之間設置前述裁斷裝置16，可以把前 述乾燥裝置1 7所乾燥的膜調整爲所要的製品寬幅。此外 ，根據前述裁斷裝置16的裁斷步驟，最好是在根據前述 延伸裝置1 5的延伸步驟之後進行。藉由如此’可以容易 地生產效率高地製造因延伸步驟而變形的端部被裁斷的光 學膜。例如，僅將前述裁斷裝置1 6設置於1處所的場合 ’最好是設在前述延伸裝置1 5與前述乾燥裝置1 7之間。 -24 - 201043560 此外，相關於本第1實施型態的光學膜之製造裝置11 • ，藉由前述之各步驟，在光學膜的製造中’使膜厚或光學 . 値等容易變成不均一的端部被裁斷，所以可得膜厚或光學 値等全體一致的光學膜。 此外，光學膜的寬幅，考慮大型液晶顯示裝置的使用 、偏光板加工時的膜的使用效率、生產效率等觀點來看， 以1 00 0〜4000mm爲佳。此外，膜的膜厚，考慮液晶顯示 〇 裝置的薄型化、膜的生產安定化的觀點，以3 0〜90 μ m爲 佳。此外，若是從前的光學膜之製造裝置，即使是容易發 生膜的破斷等不良情形的30〜50/zm之膜厚，也只要是採 . 用關於第1實施型態的光學膜之製造裝置，即可抑制不良 情形的發生而製造光學膜。在此所謂膜厚，係指平均膜厚 ，藉由（股）Mitsutoyo (音譯）製造的接觸式膜厚計，在 膜的寬幅方向測定2 0〜2 0 0處之膜厚，將其測定値之平均 値顯示爲膜厚。 Ο 以下，說明在第1實施型態使用的樹脂溶液的組成。 在第1實施型態使用的透明性樹脂，只要是藉由溶液 流延製膜法等成形爲基板狀時具有透明性的樹脂即可，沒 有特別限制’但因溶液流延製膜法等係製造容易，與硬塗 層之黏接性佳，且爲光學各向同性所以較佳。又，此處的 透明性’係指可見光的透過率爲6 0 %以上，較佳者爲8 0 % 以上，更佳者爲9 0 %以上。 作爲前述透明性樹脂，具體而言，例如可以舉出三乙 酸纖維素樹脂等纖維素酯系樹脂等。此外，於第1實施型 -25- 201043560 態使用的塗料，亦可含有微粒子。此時，使用的微粒子， 可以因應於使用目的而適當選擇，但最好是可以藉由含有 於透明性樹脂中而使可見光散射的微粒子。作爲前述微粒 子，亦可爲氧化矽等無機微粒子，亦可爲丙烯酸系樹脂等 有機微粒子。在第1實施型態使用的溶媒，可以使用含有 對前述透明性樹脂爲良溶媒的溶媒，在透明性樹脂不析出 的範圍，使其含有貧溶媒亦可。作爲對纖維素酯系樹脂的 良溶媒，例如可以舉出二氯甲烷等有機鹵化物等。此外， 作爲對纖維素酯系樹脂之貧溶媒，例如可以舉出甲醇等碳 原子數1〜8之醇等。在第1實施型態使用的樹脂溶液， 在不阻礙本發明的效果的範圍，亦可含有透明性樹脂、微 粒子及溶媒以外的成分（添加劑）。作爲前述添加劑，例 如可以舉出可塑劑、氧化防止劑、紫外線吸收劑、熱安定 劑、導電性物質、難燃劑、滑劑、及消艶（matt )劑等。 此外，藉由混合前述各組成可得纖維素酯系樹脂的溶 液。此外，所得到的纖維素酯系樹脂的溶液，以使用濾紙 等適當的濾材進行過濾爲較佳。 (融溶流延製膜法） 其次，說明藉由融溶流延製膜法製造光學膜的場合（ 第2實施型態）。 相關於第2實施型態的光學膜之製造方法，具備使含 有透明性樹脂融溶之樹脂融溶液流延於移動的支撐體上形 成流延膜之流延步驟，使前述流延膜冷卻而形成膜的冷卻 -26- 201043560 步驟’前述膜由前述支撐體剝離的剝離步驟，延伸剝離的 • 膜之延伸步驟’及把延伸的膜捲取成卷狀的捲取步驟；前 . 述裁斷步驟’係在前述剝離步驟與前述捲取步驟之間進行 的。例如，藉由圖4所示的光學膜之製造裝置來進行。又 ，作爲光學膜之製造裝置，只要是進行前述各步驟者，不 限於圖4所示者’亦可爲其他種構成。此外，此處的膜， 係被流延於支撐體上的塗料所構成的流延膜（網，web )在 〇 支撐體上乾燥，成爲應由支撐體剝離的狀態以後者。 圖4係顯示根據融溶流延製膜法之光學膜的製造裝置 21的基本構成之槪略圖。光學膜之製造裝置21，具備： 第1冷卻輥22、流延模23、接觸輥24、第2冷卻輥25、 第3冷卻輥26、剝離輥27、搬送輥28、延伸裝置29、裁 斷裝置30以及捲取裝置31等。前述流延模23，使融溶透 明性樹脂的樹脂融溶液（塗料）流延於第1冷卻輥22的 表面上。前述第1冷卻輥22，形成由從前述流延模23流 〇 延的塗料所構成的流延膜，將其搬送同時使其冷卻，把前 述流延膜搬送至第2冷卻輥25。此時，藉由外接而被設於 第1冷卻輥22的接觸輥24，進行流延膜的厚度調整’或 表面的平滑化。接著，第2冷卻輥25，搬送前述流延膜同 時使其冷卻，將前述流延膜搬送至第3冷卻輥26。藉由如 此，使前述流延膜成爲膜。前述剝離輥2 7，把膜由第3冷 ' 卻輥26剝離。前述搬送輥28 ’搬送前述膜同時延伸於 MD方向。前述延伸裝置29’使膜延伸於TD方向。前述 裁斷裝置3 0，裁斷被延伸的膜的端部，對裁斷的端部膜施 -27- 201043560 以特定的處理。前述捲取裝置31 ’把冷卻固化的膜捲取爲 卷狀，成爲膜卷。 前述流延模23，作爲塗料，除了替代樹脂溶液而吐出 樹脂融溶液以外，係與前述流延模1 3同樣的構成。 前述第1冷卻輥22、第2冷卻輥25及第3冷卻輥26 ，係表面爲鏡面之金屬製的輥。作爲前述各輥，由流延膜 或膜的剝離性的觀點來看，例如以使用不銹鋼等所構成的 輥較佳。藉由前述流延模2 3流延的流延膜的寬幅或根據 前述第1冷卻輥22、第2冷卻輥25及第3冷卻輥26之流 延膜的搬送速度，與前述第1實施型態相同。 前述接觸輥24，表面具有彈性’藉由往前述第1冷卻 輥22之按壓力，沿著前述第1冷卻輥22的表面變形’在 與前述第1冷卻輥22之間，形成乳頭狀隆起。作爲前述 接觸輥24，只要是從前就已經在融溶流延製膜法使用的接 觸輥即可，沒有特別限定而可以使用。具體而言，例如’ 可以舉出不銹鋼製者。 前述剝離輥27，接於第3冷卻輥26，藉由加壓而剝 離膜。 前述搬送輥2 8，係由複數搬送輥所構成’藉由使各搬 送輥爲不同的旋轉速度’可以在膜的MD方向進行延伸。 此外，前述延伸裝置29、前述裁斷裝置30'及捲取 裝置3 1，可以使用與前述第1實施型態之延伸裝置1 5、 裁斷裝置16、及捲取裝置18相同的裝置。 相關於本第2實施型態的光學膜之製造裝置2 1，係將 -28- 201043560 前述裁斷裝置30，設於前述延伸裝置29與前述捲取裝置 • 3 1之間，但不以此爲限，只要設在前述剝離輥27與前述 . 捲取裝置3 1之間即可。但是，根據前述裁斷裝置1 6的裁 斷步驟，最好是在根據前述延伸裝置29的延伸步驟之後 進行。藉由如此，可以容易地生產效率高地製造因延伸步 驟而變形的端部被裁斷的光學膜。此外，相關於本第2實 施型態的光學膜之製造裝置21，具備前述搬送輥29及前 0 述延伸裝置29，但亦可不具備，此外，分別於2個處所以 上具有前述之物亦可。 此外，相關於本第2實施型態的光學膜之製造裝置2 1 ，藉由前述之各步驟，在光學膜的製造中，使膜厚或光學 - 値等容易變成不均一的端部被裁斷，所以與相關於前述第 ' 1實施型態之光學膜的製造裝置1 1所形成的光學膜同樣， 可得膜厚或光學値等全體一致的光學膜。 此外，光學膜的寬幅，考慮大型液晶顯示裝置的使用 〇 、偏光板加工時的膜的使用效率、生產效率等觀點來看， 以1 0 0 0〜4 0 0 0 m m爲佳。此外，膜的膜厚，考慮液晶顯示 裝置的薄型化、膜的生產安定化的觀點，以30〜90 /z m爲 佳。此外，若是從前的光學膜之製造裝置，即使是容易發 生膜的破斷等不良情形的3 0〜5 0 // m之膜厚，也只要是採 用關於第1實施型態的光學膜之製造裝置，即可抑制不良 ' 情形的發生而製造光學膜。在此所謂膜厚，係指平均膜厚 ，藉由（股）Mitsutoyo (音譯）製造的接觸式膜厚計，在 膜的寬幅方向測定20〜200處之膜厚，將其測定値之平均 -29- 201043560 値顯示爲膜厚。 以下’說明在第2實施型態使用的樹脂融溶液的組成 〇 在第2實施型態使用的透明性樹脂，只要是可加熱融 溶得即可’可使用與前述第1實施型態之透明樹脂相同的 樹脂。此外，其他組成，也可以使用與前述第1實施型態 之場合相同的組成。 此外，本發明不限於前述第1實施型態及第2實施型 態’藉由連續搬送膜，同時裁斷端部，可適用於製造光學 膜之製造方法。 (偏光板） 相關於本實施型態的偏光板，具備偏光元件、及被配 置於前述偏光元件的表面上之透明保護膜，前述透明保護 膜，係相關於本實施型態之光學膜。前述的偏光元件，是 使入射光改變爲偏光而射出的光學元件。 作爲前述偏光板，最好是例如把聚乙烯醇系膜浸漬於 碘溶液中進行延伸而製作的偏光元件之至少一方之表面上 ，使用完全鹼化型聚乙烯醇水溶液，貼合前述光學膜者。 此外，前述偏光元件之另一方表面，亦可使層積前述光學 膜，亦可使層積其他的偏光板用之透明保護膜。作爲此偏 光板用之透明保護膜，例如作爲市售的纖維素酯膜，最好 是使用 KC8UX2M ' KC4UX ' KC5UX ' KC4UY ' KC8UY、 KC12UR、KC8UY-HA、KC8UX-RHA (以上爲 Konica -30 - 201043560201043560 VI. Description of the invention: * [Technical field to which the invention belongs]. The present invention relates to an optical film which can be used for various functional films such as a protective film for a polarizing plate of a liquid crystal display device, a retardation film, a viewing angle widening film, and an antireflection film used for various image display devices such as a plasma display device. The production method includes the optical film obtained by the above production method, a polarizing plate used for the optical film, and a liquid crystal display device including the polarizing plate. [Prior Art] The image display device, in particular, the liquid crystal display device, has been widely used by improving its image quality or high-definition technology. Further, the liquid crystal display device, in particular, a liquid crystal display device used as a television receiving device, is required to have a large screen and high image quality. Therefore, the optical film provided in the liquid crystal display device, for example, a protective film for a polarizing plate, is required to have improved visual recognition performance, and is required to have a wider lateral width in response to a larger screen. Then, in order to cope with the reduction in cost of the liquid crystal display device or the demand for the liquid crystal display device, it has been demanded to increase the production efficiency of the optical film. In order to increase the production efficiency of an optical film, it is considered to continuously produce an optical film. As a method of continuously producing an optical film, for example, a solution casting method, a film method, a melt casting film forming method, and the like can be given. In the solution casting film forming method, a resin solution in which a raw material resin is dissolved in a solvent is cast on a moving support, and a film obtained by drying to a certain extent is peeled off from the support, and by moving - 5-201043560 A method of producing a resin film by conveying a peeled film by a roll while drying it. Further, the melt-cast casting film forming method is a method in which a resin solution obtained by heating and melting a raw material resin is cast on a support, and a film obtained by cooling and solidifying to a certain extent is peeled off from the support by a transfer roller. A method of producing a resin film by transporting the peeled film while cooling and solidifying it. The resin film obtained by the above-described method may cause curling or wrinkles at the ends during transportation. In such a case, in order to utilize the obtained resin film as an optical film, there is a problem that the production efficiency is lowered without cutting the film end portion. Further, in the above-described method, in the case of producing a wide-width resin film, the resin film is produced by folding the end portion of the resin film toward the transfer roller during the transfer of the resin film. The problem of stopping. In order to solve these problems, for example, after the resin film is peeled off from the support, until the resin film is wound up into a roll shape as an optical film, the resin film is conveyed and trimmed by a trimming blade (trimming) ). That is, in the production of the resin film, the cut end portion film is separated by cutting the end portion, and the remaining film is used as an optical film. However, if the conveyance of the end film after the cutting is not smoothly performed, the conveyance of the resin film before cutting or the conveyance of the optical film after separating the end film may be affected. Specifically, for example, when the end film is broken during the conveyance or the end film is deviated from the specific conveyance path, even if it is conveyed in the pipe so as not to deviate from the specific conveyance path, it is also at the inner end of the pipe. The film is blocked or the like, so that the conveyance of the cut end film cannot be smoothly performed. Then, since the conveyance of the end film is not carried out smoothly, for example, -6-201043560 causes a decrease in the tension of the optical film or the like after separation of the end film, which hinders the conveyance of the optical film. . For example, the method described in the following Patent Documents 1 to 3 can be exemplified as a method of cutting the end of the film. Patent Document 1 listed below describes automatic processing of the ear of the ear (end film) which is produced when the wide web of the moving direction is cut in the moving direction to obtain a plurality of narrow wide webs having a desired width. The device is configured to use an ear cutting device that is movable in a wide direction of the wide web that moves in the above-described manner, and that cuts the cutting ear in a wide direction, and the aforementioned cutting by the ear cutting device The cutting ear is pulled away by the aforementioned wide web. The 'ear transport means' which can be moved in the wide direction of the aforementioned wide web, and the width and number of the narrow wide web which are cut along with the width of the wide web and the aforementioned wide web A method of cutting the ear automatic processing device configured by determining the position of the cutting ear and the control means for the position of the ear cutting means and the ear conveying means. According to Patent Document 1, it is disclosed that the control means for positioning the ear cutting means and the ear transport means in accordance with the position of the cut ear can be automatically adapted to various changes such as the width of the original plate (resin film). In other words, the cutting position of the resin film can be automatically changed by the wide width of the resin film or the like, and the resin film can be cut stably. Furthermore, in the following Patent Document 2, the first step of the film-side end portion (end film) which is cut from the film which is continuously conveyed by the long-sized wind is described. The method of conveying the end portion to the collecting portion is provided with a pair of rollers for holding the side end portion in the first step, and is held by the side end portion before the pair of rollers by 201043560, and is applied in the longitudinal direction thereof. Air supply method of tension of 3N/m2 or more and 45N/m2 or less. According to Patent Document 2, by applying a certain tension to the end film cut by the film by the pair of rolls, it is possible to cut the end film from the film until the air supply path is not blocked until the end film is recovered. The wind sends the end film. In the following Patent Document 3, a dressing roller that guides a sheet-like product, a dressing blade that cuts the vicinity of both end portions of the sheet-like object along the moving direction of the sheet-like article, and a guide blade provided on the guide roller are described. Downstream, a traverse blade that cuts an edge (end film) cut by the dressing blade in the wide direction of the edge, and an air blowing device that sucks/discharges the edge cut in the wide direction An edge trimming device for forming a sheet, and a guide for transporting the edge cut in the width direction to the air blowing device by interposing between the guide roller and the air blowing device a guiding unit having a surface on the surface of the slit for injecting compressed air from the surface of the sheet toward the downstream direction at an injection angle of 3 to 45°, and supplying the outer casing A method of edge trimming apparatus for a thin plate formed by a compressed air supply means of compressed air. According to Patent Document 3, it is revealed that the edge trimming can be automatically performed regardless of the thickness of the sheet, and the cut edge (end film) can be smoothly conveyed into the suction box, and automation can be achieved. [PRIOR ART DOCUMENT] [Patent Document 1] Japanese Patent Laid-Open No. Hei. No. Hei. No. Hei. No. 2005-238801 (Patent Document 3) Japanese Patent Laid-Open No. Hei-5- 1 3 1 3 9 8 SUMMARY OF THE INVENTION An object of the present invention is to provide a method for producing an optical film by transporting a film while cutting an end portion of the film, and an optical film obtained by separating the end film is smoothly A method for producing an optical film having high production efficiency. An aspect of the present invention is characterized in that the conveying film simultaneously cuts at least one end portion in a direction perpendicular to the conveying direction of the film, and separates the cut end film to form an optical film cutting step, and To be separated . a conveying step in which the end film is inserted into the pipe and conveyed by the air in the pipe; and in the conveying step, the wind speed of the air blowing air used in the air is increased from the upstream side to the downstream side of the pipe A method of producing an optical film characterized by the same. Further, another aspect of the present invention is an optical film obtained by the method for producing an optical film described above. Further, another aspect of the present invention provides a polarizing plate comprising a polarizing element and a transparent protective film disposed on a surface of at least one of the polarizing elements, wherein the transparent protective film is a polarizing plate characterized by the optical film. Further, another aspect of the present invention is a liquid crystal display device comprising a liquid crystal cell and two polarizing plates arranged to sandwich the liquid crystal cell, wherein at least two of the two polarizing plates are included One of the above-mentioned polarizing plates -9 - 201043560 The objects, features, % and advantages of the present invention will become more apparent from the following detailed description and drawings. [Embodiment] According to the method of the inventor of the present invention, the method described in the patent document 1 can be stably blocked in the end portion of the pipe as described above, even if the resin film can be stably loaded. On the other hand, if the cutting of the end film after the cutting is carried out, the g tongue which is smoothly performed by the hS may cause a problem that the optical film cannot be smoothly conveyed. Further, in the method described in Patent Document 2, the tension applied to the film is too strong, and the film is broken. The breaking of the film is particularly likely to occur in a film-like film or a film having a low tensile strength. Further, when the film is broken, the end portion of the end film that is conveyed in the air-feeding path becomes a free end, so that it is easily affected by the wind blown air in the air-feeding path, and it is easy to make a large stick. live). Further, the vibration from the cutting device that cuts the end film in the pipe is easily transmitted to the end film, making the end film easier to stick. In the case where the end film is largely viscous, there is a problem that the end film is blocked or the end film is further broken. Further, in the method described in Patent Document 3, the film is blown at a certain angle from the upstream side to the end film of the pipe, but the film on the downstream side is easily viscous. In the case where the end film is largely viscous, there is a problem that the end film is clogged or the end film is further broken. In particular, when the film is stretched by a film stretching device called a tenter, and the end portion of the film is cut, the film is held by the gripper with a clip, resulting in a cloth grip of -10-201043560. The deformation causes the surface of the end film to be cut to be formed with irregularities*, and the resistance of the wind is greatly increased due to the unevenness, so that there is an end film. It is harder to get a smoother problem. The present invention has been invented based on the results of the review as described above. The following describes the embodiment of the method for producing an optical film according to the present invention, but the present invention is not limited to these descriptions. In the method for producing an optical film according to the present embodiment, the end portion of at least one of the directions perpendicular to the conveyance direction of the film is cut while the film is being conveyed, and the cut end film is separated. a cutting step of the optical film, a transfer step of inserting the separated end film into the pipe, and conveying the air in the pipe; and the wind speed of the wind blown air used in the conveying step is The upstream side of the piping becomes faster toward the downstream side. According to the above configuration, the film can be conveyed and the end portion of the film can be cut to produce an optical film, so that the optical film can be continuously produced. Then, in the continuous production of such an optical film, it is possible to provide a method for producing an optical film having a high production efficiency by smoothly transporting an optical film obtained by separating the cut end film. This situation can be considered as follows. First, the cut end film is inserted into the pipe and conveyed into the pipe. Therefore, even when the optical film is continuously produced, it is possible to suppress the end film from deviating from the specific transport path. In addition, the end film which is conveyed in the piping tends to have a larger sticking force from the upstream side of the piping to the downstream side. -11 - 201043560 When the slap of the film is very large, the optical film obtained by obstructing the circular separation of the end film will smoothly convey the squeegee. When the wind speed of the wind is increased, the end may be generated. The tendency of the membrane to break. The end film is broken and the end film is smoothly conveyed. Here, by the wind speed of the air blown for the conveyance, the center of the pipe can be suppressed so that the wind speed of the end film can be suppressed from being caught by the wind upstream of the pipe. . By thus blowing the wind toward the front wind, it should be possible to effectively suppress the stickiness. Since the wind speed of the wind blown air is increased, it should be possible to suppress the above situation. That is, because it is possible to suppress the transfer of the optical film due to the end film, it is possible to lift the end of the film, and to manufacture the optical film, the optical film obtained by the end film is smoothly conveyed to the film. Manufacturing method. Next, it is preferable to further include, in the case of carrying out the above-described cutting step of the optical film according to the present embodiment in the direction in which the end direction of the end film is conveyed in the direction in which the end film is conveyed, and the transfer step, specifically, for example, It can be exemplified by a solution casting film forming method or the like, and the film is peeled off from the support until it is slipped and conveyed, thereby hindering the passage. Then, in order to suppress the sticking, it is more resistant to the downstream side of the side of the end film, and the direction of the air blow is directed toward the center of the pipe. The end film is not broken as a whole. The end film in the tube is smoothly smoothed and conveyed to the conveyed film while being separated from the cutting step by separating the above-mentioned high-efficiency photo film. The method is not particularly limited as long as it is provided. Film-forming method and melt-casting method 156-201043560 A method of producing an optical film by the above-described cutting step at a specific position. . (Solution Cast Film Forming Method) First, a case where an optical film is produced by a solution casting film forming method will be described (first embodiment). The method for producing an optical film according to the first embodiment includes a casting step of forming a film by casting a resin solution (coating material) containing a transparent resin onto a moving support, and peeling the film from the support. a stripping step, an extending step of extending the stripped film, and a winding step of taking the stretched film into a roll; the cutting step is performed in the stripping step and the aforementioned roll. Take the steps between the steps. For example, it is carried out by the apparatus for manufacturing an optical film shown in Fig. 1. Further, the apparatus for manufacturing an optical film is not particularly limited to those shown in Fig. 1 as long as the steps of the above-described steps are performed, and may be other types. Further, the film here is dried on the support by a cast film (web) composed of a paint cast on the support, and is in a state in which the support is peeled off. Fig. is a schematic view showing the basic configuration of an optical film manufacturing apparatus 11 according to a solution casting film forming method. The optical film manufacturing apparatus 11 includes an endless belt support body 1, a casting die 13, a peeling roller 14, an extension device 15, a cutting device 16, a drying device 17, a winding device 18, and the like. In the casting die 13 described above, the resin solution (coating) 1 in which the transparent resin is dissolved is cast on the surface of the endless belt support 12. The endless belt support 12 forms a web composed of the coating material 19 cast from the casting die 13 and is dried while being conveyed to form a film. The peeling roller 14 peels the film from the -13-201043560 endless belt support 1 2 . The aforementioned stretching device 15 extends the peeled film. The drying device 17 conveys the stretched film ' by a conveyance roller while drying it. The winding device 18 winds the dried film into a roll shape to form a film roll. Further, as shown in Fig. 1, the cutting device 16 is provided between the peeling roller 14 and the stretching device 5, between the stretching device 15 and the drying device 17, the drying device 17 and the aforementioned roll. Take between devices 18. Next, the cutting device 16 cuts the end portions of the film at each place, and applies a specific treatment to the cut end film. Further, in the method of manufacturing the optical film according to the present embodiment, the cutting device 16 is not limited to the manufacturing device η' provided at three locations, as shown in Fig. 1, or may be one place, or two places, or 4 places so. As shown in Fig. 1, the casting die 13' is supplied with a coating material 9 by a coating supply pipe which is connected to the upper end portion of the casting die 13. Then, the supplied paint is discharged from the casting die 13 to the endless belt support 12, and a web is formed on the endless belt support 12. The endless belt support 12, as shown in Fig. 1, is an endless belt made of metal that has a mirror surface and is infinitely movable. As the belt, from the viewpoint of the peeling property of the film, for example, a belt made of stainless steel or the like is preferable. The width of the cast film cast by the casting die 13 is not particularly limited, but it is preferably the endless belt support 12 from the viewpoint of effectively utilizing the width of the endless belt support 1 2 . The width is 8〇~99%. Next, in order to finally obtain an optical film having a width of 1000 to 4 OO mm, the width of the endless belt support 12 is preferably 18 〇〇 to 5 〇〇〇 mm. In addition, instead of the endless belt support, a mirror-shaped rotating metal drum -14- 201043560 (endless roller support) may be used. * Next, the endless belt support 12 is conveyed on the surface thereof. The cast film (web) on the top while drying the solvent in the coating. The aforementioned drying is carried out, for example, by heating the endless belt support 1 2 ' or by blowing hot air against the net. In this case, the temperature of the net varies depending on the solution of the coating material, and it is preferable to use a range of -5 to 5, preferably more preferably 0 to 60 ° C, depending on the conveying speed or productivity of the evaporation time of the solvent. . The temperature of the web is higher than 0, and the drying speed of the solvent can be increased, which is preferable. However, if it is too high, foaming or planarity tends to be deteriorated. When the endless belt support 1 2 is heated, for example, a method of heating the web on the endless belt support 1 2 by an infrared heater, a method of heating the back surface of the endless belt support 1 2 by an infrared heater, or A method of heating the back surface of the endless belt support 1 2 by heating air, etc., may be appropriately selected as necessary. Further, in the case where the heated air is blown, the wind pressure of the heated air is preferably 50 to 5000 Pa in consideration of the uniformity of the evaporation of the oxime solvent. The temperature of the heated wind may also be dried at a certain temperature, or may be supplied to the moving direction of the endless belt support 12 in a plurality of stages. The time between casting the coating on the endless belt support 1 2 until the web is peeled off by the endless belt support 12 is different depending on the film thickness of the produced optical film and the solvent used, but considering the endless belt The stripping property of the support 12 is 0. A range of 5 to 5 minutes is preferred. The transport speed of the cast film of the endless belt support 1 2 is not particularly limited, but from the viewpoint of productivity, it is preferably, for example, 50 to -15 to 201043560 200 m/min. In addition, for the aforementioned movement speed of 12, the casting speed of the cast film. Draft ratio) is 0. 8~1. 2 is preferred. In the case of the above, a cast film can be formed stably. For example, in the case of pulling, there is a tendency that the cast film is narrowed in the wide direction, which is called a neck phenomenon, and as a result, it becomes impossible to form the wide peeling roller 14 from the side of the endless belt support 1 The surface is peeled off by the web (film) which is dried by pressurizing the endless belt. From the endless belt support, the film extension direction is caused by the peeling tension and the subsequent conveyance tension (machining direction; Machine Direction: MD, and the peeling sheet when the film is peeled off by the endless belt support 1 2 is, for example, 50 to 400 N/m 2 In addition, the amount of residual solvent at the time of the endless belt support 1 2, the conveyance after peeling, the physical properties of the optical film to be conveyed, and the like, and the amount of all remaining solvent of the film when the film is supported by the endless belt are considered. In the cutting device 16 of 30 to 200 mass, the end portion of the cutting film which is approximately perpendicular to at least one of the direction (wide direction) is formed into a thin piece by applying a specific treatment to the film. For example, Fig. 2 is a schematic perspective view of the periphery of the teeth 16. The cutting device 16 includes a trimming 53, a guide roller pair 42, a first pipe 43, and a cut. The ratio of the end belt support of the breaking device (the stretching ratio, the stretching ratio is too large, and the necking ratio is too large.) The coating of the coating 1 is on the side of the body 12, so that the film is stretched by the film when the film is peeled off by the film. Transfer direction). Therefore force and transfer tension peeling The peeling percentage of the support body after peeling and drying is preferably good. • The end of the conveying direction is cut by 16, specifically: the cutting device blade, the guide roller 44, and the second -16-201043560 piping 45. The trimming blade cuts out the end portion of the film 41 that is conveyed in a direction (wide direction) that is approximately perpendicular to the conveying direction so as to be cut. The remaining portion of the film is cut in such a manner as to transport the optical film of the article. The cut end is treated as the end film 46. The guide roller 53 and the pair of guide rollers 42 guide the end film 46 from the upstream end portion of the first pipe 43 to the first pipe 43. The first pipe (43) sucks the end film (46) and conveys it to the cutting device (44) by air. The cutting device 44 is connected to the downstream end portion of the first pipe 43, and is cut finely in a direction substantially perpendicular to the conveying direction of the end film 46 to form a thin piece 47. One end portion of the second pipe 45 is connected to the cutting device 44, and the fine piece 47 is transported by air to the end portion of the other end portion 47 that is connected to the other end portion. Storage tank (not shown), etc. The trimming blade is not particularly limited as long as it can cut the end of the film to be conveyed. As the trimming blade, in order to appropriately cut the end portion of the film, it is preferable to adjust the depth of the cut of the film arbitrarily. For example, the rotation of the cutting edge formed by the upper and lower round edges may be mentioned. Round plate type or knife type. The guide roller 53 and the pair of guide rollers 42 are not particularly limited as long as the end film 46 can be guided into the first pipe 43. The guide roller 53 is not particularly limited as long as it can guide the end film 46 from the upstream end of the first pipe 43 to the first pipe 43, and is not limited thereto. A driven roller or the like for transporting the end film 46. The guide roller pair 42 is, for example, a roller that holds the end film 46-17-201043560, and at least one of the rollers is a drive roller that applies tension to the end film 46 before being held in the conveyance direction. Further, the pair of guide rollers 42 may be formed by a driven roller that is driven by the end film 46, and may be guided to the first pipe by using the driving roller as described above. It is preferable that the end film 46 before 43 is applied with a tension in the conveyance direction, whereby the generation of the sticking of the end film 46 can be suppressed. Further, it is preferable that the roller of the pair of guide rollers 42 is made of a metal whose outer peripheral surface is made of rubber or which is formed with irregularities for suppressing the sliding of the end film. The first pipe 43 is sucked toward the cutting device 44 at the downstream end portion of the first pipe 43 in the cutting device 44'. In other words, the first pipe 43 is inserted into the end film 46 of the first pipe 43, and is conveyed to the cutting device 44 by air. In this manner, the cut end film 46 is inserted into the first pipe 43 and conveyed in the first pipe 43, so that even when the optical film is continuously produced, the end film 46 should be prevented from deviating from the specific state. Shipping path. Then, the suction is applied to the wind in the first pipe 43 toward the cutting device 44. Specifically, for example, in the second pipe 45 connected to the cutting device 44 on the downstream side of the first pipe 43, the air flows toward the downstream side by an air compressor (compressor) or the like. It is also possible to generate the aforementioned wind blown air. Then, in the first pipe (43), the wind speed of the air blower used for the wind is sucked so as to become faster toward the downstream side from the upstream side of the first pipe (43). The method of increasing the wind speed of the air blown from the upstream side to the downstream side is not particularly limited. Specifically, for example, -18 - 201043560, the first pipe 43 may be provided with a wind speed adjusting valve or a suction port for the wind, and a cross-sectional area of a portion through which the airflow of the first pipe 43 flows. It is preferable that the upstream side becomes smaller toward the downstream side. By doing so, it is not necessary to separately prepare means for increasing the wind speed of the wind blown from the upstream side to the downstream side. For example, the first pipe 43 can be improved without separately preparing the air velocity adjusting valve or the air suction port. The wind speed of the wind blown from the upstream side to the downstream side. Further, the ratio of the cross-sectional area of the downstream end portion of the first pipe 43 to the cross-sectional area of the upstream end portion (downstream side/upstream side) is preferably 10 to 95%, and is 15 to 85%. good. Further, the wind speed of the wind blown air may be measured using an anemometer, specifically, a hybrid anemometer DP 70 manufactured by Nikko. . By making the downstream side wind speed higher than the upstream side as described above, the cut end film 46 is smoothly conveyed into the first pipe 43, so that the end film can be smoothly conveyed by separating the end film 46 obtained optical film. This situation can be considered as follows. 〇 In general, a long film such as an end film that is conveyed in a pipe tends to stick to the downstream side from the upstream side of the pipe. When the sticking of the end film is large, the smooth transfer of the end film is hindered, and the smooth transfer of the optical film by separating the end film is hindered. Then, in order to suppress the sticking force and increase the wind speed of the wind blowing, the sticking can be suppressed, but the end film tends to be broken. In the case where the end film is broken, it is more hindering the smooth transfer of the end film. In this case, the wind speed of the air blower used when the end film 46 is conveyed is increased toward the downstream side by the upstream side of the first pipe 43. -19- 201043560 Specifically, for example, the first pipe 43 having a smaller cross-sectional area on the downstream side than the cross-sectional area on the upstream side is used. In this way, the wind speed of the wind blown air is not improved as a whole, and the direction of the wind blown on the downstream side where the sticking is large is directed toward the center portion of the pipe so as to suppress the sticking of the end film. The wind blowing by the wind toward the central portion of the piping as described above should be effective in suppressing sticking. Further, since the wind speed of the wind blown air is not increased as a whole, it is also possible to suppress the breakage of the end film. In the above case, the end film 46 conveyed in the first pipe 43 should be smoothly conveyed. Therefore, it is possible to suppress the conveyance of the optical film from being hindered by the conveyance of the end film 46, and to cut the end portion of the film at the same time as the conveyance film, and to continuously smooth the production of the optical film, the optical film is smoothly Transfer to become a productive person. Further, the wind speed difference between the wind speed of the upstream end portion of the first pipe 43 and the wind speed of the downstream end portion of the first pipe 43 is preferably 0. 5 to 50 m / sec. In this way, it is possible to effectively suppress the sticking due to the rapid wind blown on the downstream side where the sticking tends to become large without increasing the overall wind speed of the wind blown air. Namely, it is possible to further suppress the sticking of the end film, etc., so that the end film can be conveyed more smoothly, and the optical film obtained by separating the end film can be smoothly conveyed. In the cutting device 44, the downstream end portion 'connected to the first pipe 43 is thinly cut in a direction substantially perpendicular to the conveying direction of the end film 46, and the end film 46 is made thin. The sheet 47 can be 'not particularly limited. Specifically, for example, a long-length end film that is conveyed in the first -20-201043560 pipe 43 is provided with a rotary blade 51 as shown in FIG. 3 and a fixed blade (not shown). The cutter can be continuously cut by inserting the rotating rotary blade 51 and the fixed blade. More specifically . For example, the rotating blade 5 1 includes a rotating shaft ′ disposed along the width direction of the end film 46 conveyed by the first pipe 4 3 on the circumferential surface of the rotating shaft along the rotation axis direction. An extended number of scalloped edges. Further, the fixed blade ' is provided to face the circumferential surface of the rotating shaft of the rotary blade, and the long edge of the rotary blade 51 is approached by the rotation 0 of the rotary blade 51. The cutting device rotates the rotary blade 51. The long edge of the rotary blade 51 and the fixed blade approach each other at a predetermined interval. The end of the long shape is rotated by the rotation 51 and the fixed blade. The film 'can be continuously performed. Broken. 3 is a schematic view showing the vicinity of the cutting device 44. Further, as shown in FIG. 3, the sectional area of the portion of the cutting device 44 is preferably higher than that of the above. The cross-sectional area of the portion where the wind-driven air flows on the lower side of the pipe 43 becomes smaller. The method of reducing the cross-sectional area of the portion of the front shovel cutting device 44 through which the wind-driven air flows is not particularly limited. Specifically, as shown in FIG. 3( a ), the rotation axis of the rotary blade 51 may be thickened. The cross-sectional area of the portion of the cutting device 44 through which the air is blown can be reduced. Alternatively, as shown in FIG. 3(b), the cutting device 44 itself can be reduced, that is, the cutting blade 51 and the fixed blade can be reduced. The casing is also available. In this way, the cross-sectional area of the portion where the wind blown air flows before the cutting device 44 that is connected to the downstream end portion of the first pipe 43 is reduced, so that the wind speed of the wind blown by the wind can be described. From the upstream side of the first pipe 43, the inside of the first pipe 43 and the length of the 5 1 » 44 blade are cut, and the hurricane is turned on, and the downstream side becomes faster as the description is more than -21,435,460. Further, the end film 46 is also patted by the cutting step of the cutting device 44, and the squeezing prevents the rounded conveyance of the end film 46. Here, by making the cutting device 44 as described above, it is possible to suppress the sticking of the end film 46 caused by the cutting step of the cutting device 44. That is, the sticking of the end film 46 can be more suppressed, and the optical film obtained by separating the end film 46 can be conveyed more smoothly. The second pipe 45 is connected to the cutting device 44, and the second pipe 45 is sucked from the cutting device 44 toward a storage tank or the like for storing the thin piece 47, for example. In other words, the second pipe 45 cuts the fine piece 47 cut by the cutting device 44 by air, and transports it to a storage tank or the like for storing the fine piece 47. Then, the fine piece 47 stored in the storage tank or the like may be used as a film material again. At that time, it is preferable to break the aforementioned fine sheet 47 into finer. Further, the cutting device 16 is disposed between the peeling roller 1 4 and the stretching device 15 respectively, between the stretching device 15 and the drying device 17, the drying device 17 and the winding device. Between 1 and 8. The stretching device 15 extends the film peeled from the endless belt support 12 (the film cut at the end portion by the cutting device 16) in a direction orthogonal to the conveying direction of the net (transverse direction; Transverse Direction: TD direction) on. Specifically, by gripping both end portions in the direction perpendicular to the conveying direction of the film with a grip or the like, the distance between the opposing grips is increased to extend in the TD direction. Further, in the first embodiment, the extension device 15 5' is provided, but it may not be provided. Further, the amount of all the residual solvent of the film 22-201043560 extended by the above-described stretching device 15 is not particularly limited, but is, for example, 1 to 20 by mass from the viewpoint of the cutting property of the cutting device 16 described above. The percentage is better than _. Further, when the extension device 15 is not provided, it is preferable that the amount of all the remaining solvent of the film is equal to the mass percentage until the film is supplied to the cutting device 16. The drying device 17' includes a plurality of conveying rollers, and the film is dried when the film is conveyed between the rollers. At this time, it is also possible to dry by using heated air, infrared rays, or the like, and drying with heated air and infrared rays. It is preferred to use heated air from the standpoint of convenience. As the drying temperature, depending on the amount of residual solvent in the film, the appropriate temperature is also different. Considering the drying time, the difference in shrinkage, and the stability of the amount of expansion and contraction, the amount of residual solvent is in the range of 30 to 180 °C. It can be decided by appropriate choice. Further, drying at a certain temperature may be carried out in a temperature of 2 to 4 stages, and may be dried at a temperature of several stages. Further, when transporting in the drying device 17 or the like, the film may be extended in the MD direction. The amount of residual solvent in the film after the drying treatment of the drying device 17 is taken into consideration, in consideration of the load in the drying step, the dimensional stability expansion ratio during storage, and the like. 0 1 to 1 5 mass percent is preferred. In the winding device 18, the film which is a specific amount of residual solvent is wound into the core by the drying device 17 by a necessary amount. Further, the temperature at the time of winding is preferably to be cooled to room temperature in order to prevent scratching and winding looseness due to shrinkage after winding. The coiler to be used is not particularly limited, and a general-purpose machine can be used, and a winding method such as a constant tension method, a constant torque method, a gradient tension method, or a program tension control method with a constant internal stress can be used for winding. . -23- 201043560 In relation to the optical film manufacturing apparatus u of the first embodiment, the cutting device 16 is disposed between the peeling roller 14 and the extending device 15, between the extending device 15 and the drying device 17 The drying device 17 and the winding device 8 are not limited thereto. In general, the film changes the width of the film as it shrinks or dries. On the other hand, various devices such as the extension device 15 or the drying device 17 described above may have a limitation on the film width. Here, when the cutting device 16 is provided in three or more places, even if the film is changed in width by shrinkage, drying, or the like, it can be made into a film width which is fitted to various devices. Specifically, for example, the film peeled off by the peeling roller 14 particularly changes the width of the film due to heat shrinkage, but by providing the cutting device 16 between the peeling roller 14 and the extending device 15 described above, The film width is adjusted before the film is conveyed to the aforementioned stretching device 15. Further, by providing the above-described cutting device 16 between the aforementioned stretching device 15 and the aforementioned drying device 17, it is possible to cut an end portion which is deformed by, for example, a grip mark according to the extending step of the above-described stretching device 15. Further, by providing the cutting device 16 between the drying device 17 and the winding device 18, the film dried by the drying device 17 can be adjusted to a desired product width. Further, the cutting step according to the aforementioned cutting device 16 is preferably performed after the extending step according to the aforementioned stretching device 15. By this, it is possible to easily produce an optical film in which the end portion deformed by the stretching step is cut off efficiently. For example, it is preferable to provide only the above-described cutting device 16 in one place ’ between the extending device 15 and the drying device 17 described above. Further, in the manufacturing apparatus 11 of the optical film according to the first embodiment, the film thickness or the optical property is made in the manufacture of the optical film by the above-described respective steps. Since the end portion which is likely to become uneven is cut, it is possible to obtain an optical film having a uniform thickness such as a film thickness or an optical ray. Further, the width of the optical film is preferably from 1,000 to 4,000 mm from the viewpoints of use of a large liquid crystal display device, use efficiency of a film during processing of a polarizing plate, and production efficiency. Further, the film thickness of the film is preferably from 30 to 90 μm from the viewpoint of thinning of the liquid crystal display device and stabilization of production of the film. In addition, in the case of the optical film manufacturing apparatus of the prior art, it is only necessary to use a film thickness of 30 to 50/zm which is likely to cause breakage of the film or the like. According to the manufacturing apparatus of the optical film of the first embodiment, the optical film can be produced by suppressing the occurrence of defects. Here, the film thickness means the average film thickness, and the film thickness of 20 to 200 is measured in the wide direction of the film by a contact film thickness meter manufactured by Mitsutoyo (transliteration). The average 値 is shown as the film thickness. Ο The composition of the resin solution used in the first embodiment will be described below. The transparent resin to be used in the first embodiment is not particularly limited as long as it is formed into a substrate shape by a solution casting film forming method or the like, but is not limited by the solution casting method. It is easy to manufacture, has good adhesion to a hard coat layer, and is optically isotropic. Here, the transparency " means that the transmittance of visible light is 60% or more, preferably 80% or more, and more preferably 90% or more. Specific examples of the transparent resin include a cellulose ester resin such as a cellulose triacetate resin. Further, the coating material used in the state of the first embodiment -25-201043560 may contain fine particles. In this case, the fine particles to be used may be appropriately selected depending on the purpose of use, but it is preferable that the fine particles can be scattered by the visible light contained in the transparent resin. The fine particles may be inorganic fine particles such as cerium oxide or organic fine particles such as acrylic resin. In the solvent to be used in the first embodiment, a solvent containing the transparent resin as a good solvent may be used, and a solvent may be contained in a range in which the transparent resin is not precipitated. The good solvent for the cellulose ester-based resin may, for example, be an organic halide such as dichloromethane. In addition, examples of the poor solvent of the cellulose ester-based resin include alcohols having 1 to 8 carbon atoms such as methanol. The resin solution used in the first embodiment may contain a component (additive) other than the transparent resin, the fine particles, and the solvent, insofar as the effects of the present invention are not inhibited. The above-mentioned additives may, for example, be a plasticizer, an oxidation preventive, an ultraviolet absorber, a heat stabilizer, a conductive material, a flame retardant, a slip agent, a matt agent or the like. Further, a solution of the cellulose ester-based resin can be obtained by mixing the above respective components. Further, it is preferred that the solution of the obtained cellulose ester-based resin is filtered by using an appropriate filter medium such as filter paper. (Melt-cast casting film forming method) Next, a case where an optical film is produced by a melt-cast casting film forming method (second embodiment) will be described. In the method for producing an optical film according to the second embodiment, a casting step of forming a cast film by casting a resin melt solution containing a transparent resin on a moving support is provided, and the cast film is cooled. Cooling to form a film -26- 201043560 Step 'The peeling step of peeling off the aforementioned film from the support, the step of extending the peeling film' and the winding step of taking the stretched film into a roll; The cutting step is performed between the aforementioned peeling step and the aforementioned winding step. For example, it is performed by the manufacturing apparatus of the optical film shown in FIG. Further, the optical film manufacturing apparatus is not limited to the one shown in Fig. 4 as long as the above steps are performed. Further, the film here is dried on the ruthenium support by a cast film (web) composed of a paint cast on the support, and is in a state in which it is peeled off from the support. Fig. 4 is a schematic view showing the basic configuration of an apparatus 21 for manufacturing an optical film according to a melt-cast casting film forming method. The optical film manufacturing apparatus 21 includes a first cooling roll 22, a casting die 23, a contact roll 24, a second cooling roll 25, a third cooling roll 26, a peeling roll 27, a transfer roll 28, an extension device 29, and a cutting device. 30, the winding device 31, and the like. The casting die 23 casts a resin melt solution (coating) that melts the transparent resin onto the surface of the first cooling roll 22. The first cooling roll 22 is formed with a casting film composed of a coating material which is flown from the casting die 23, and is conveyed while being cooled, and the above-described casting film is conveyed to the second cooling roll 25. At this time, the thickness of the cast film is adjusted or the surface is smoothed by the contact roll 24 provided on the first cooling roll 22 by external connection. Then, the second cooling roll 25 conveys the casting film while cooling, and conveys the casting film to the third cooling roll 26. Thus, the cast film is formed into a film. The peeling roller 27, the film is peeled off from the third cold roller 26. The transfer roller 28' transports the film while extending in the MD direction. The aforementioned extension means 29' extends the film in the TD direction. The cutting device 30 cuts the end of the stretched film and applies a specific treatment to the cut end film -27-201043560. The winding device 31' winds up the film which is cooled and solidified into a roll shape to form a film roll. The casting die 23 has the same configuration as the casting die 13 except that the resin melt solution is discharged instead of the resin solution. The first cooling roll 22, the second cooling roll 25, and the third cooling roll 26 are metal-made rolls whose surfaces are mirror-finished. As the above-mentioned respective rolls, from the viewpoint of the peeling property of the cast film or the film, for example, a roll made of stainless steel or the like is preferably used. The width of the cast film cast by the casting die 23 or the transfer speed of the cast film of the first cooling roll 22, the second cooling roll 25, and the third cooling roll 26, and the first embodiment The type is the same. The surface of the contact roller 24 has elasticity "deformed along the surface of the first cooling roller 22 by the pressing force of the first cooling roller 22" to form a nipple-like bulge between the first cooling roller 22. The contact roller 24 is not particularly limited as long as it is a contact roller that has been used in the melt casting film forming method. Specifically, for example, stainless steel can be cited. The peeling roller 27 is attached to the third cooling roller 26, and is peeled off by pressure. The conveying roller 28 is constituted by a plurality of conveying rollers, and can be extended in the MD direction of the film by causing the respective conveying rollers to have different rotational speeds. Further, as the extension device 29, the cutting device 30', and the winding device 3 1, the same device as the extension device 15 of the first embodiment, the cutting device 16, and the winding device 18 can be used. In the manufacturing apparatus 2 1 of the optical film according to the second embodiment, the cutting device 30 of -28-201043560 is provided between the extending device 29 and the winding device 31, but this is not As long as it is provided in the aforementioned peeling roller 27 and the foregoing. The winding device 3 1 may be between. However, the cutting step according to the aforementioned cutting device 16 is preferably performed after the extending step according to the aforementioned extending device 29. By doing so, it is possible to easily produce an optical film in which the end portion deformed by the stretching step is cut with high efficiency. In addition, the optical film manufacturing apparatus 21 according to the second embodiment includes the transport roller 29 and the extension device 29, but may not be provided, and may have the above-mentioned objects in two places. . Further, in the optical film manufacturing apparatus 2 1 according to the second embodiment, in the production of the optical film, the end portion in which the film thickness or the optical enthalpy or the like is likely to become uneven is cut off. Therefore, similarly to the optical film formed by the optical device manufacturing apparatus 1 1 of the above-described first embodiment, an optical film having a uniform thickness such as a film thickness or an optical enthalpy can be obtained. Further, the width of the optical film is preferably from 100 to 400 m m from the viewpoint of the use of a large liquid crystal display device, the use efficiency of the film during processing of the polarizing plate, and the production efficiency. Further, the film thickness of the film is preferably 30 to 90 /z m from the viewpoint of thinning of the liquid crystal display device and stabilization of production of the film. In addition, in the case of the optical film manufacturing apparatus of the prior art, even if it is a film thickness of 30 to 50 // m which is likely to cause a breakage of the film or the like, the optical film of the first embodiment is used. The device can produce an optical film by suppressing the occurrence of a bad condition. Here, the film thickness means an average film thickness, and a film thickness of 20 to 200 is measured in a wide direction of the film by a contact film thickness meter manufactured by Mitsutoyo (transliteration), and the average film thickness is measured. -29- 201043560 値 is shown as film thickness. In the following description, the composition of the resin melt solution used in the second embodiment will be described. The transparent resin used in the second embodiment can be used as long as it can be heated and melted. The same resin as the resin. Further, other compositions may have the same composition as in the case of the first embodiment described above. Further, the present invention is not limited to the first embodiment and the second embodiment. The method of manufacturing the optical film can be applied by continuously cutting the film and cutting the end portion. (Polarizing Plate) The polarizing plate according to the present embodiment includes a polarizing element and a transparent protective film disposed on the surface of the polarizing element, and the transparent protective film is an optical film according to the present embodiment. The above-mentioned polarizing element is an optical element that changes incident light into polarized light and emits it. In the polarizing plate, for example, a polyvinyl alcohol-based film is immersed in at least one surface of a polarizing element which is formed by stretching in an iodine solution, and a fully alkalized polyvinyl alcohol aqueous solution is used to bond the optical film. . Further, the other surface of the polarizing element may be formed by laminating the optical film or laminating a transparent protective film for another polarizing plate. As the transparent protective film for the polarizing plate, for example, as a commercially available cellulose ester film, it is preferable to use KC8UX2M 'KC4UX 'KC5UX ' KC4UY ' KC8UY, KC12UR, KC8UY-HA, KC8UX-RHA (above is Konica -30 - 201043560
Minolta Opto (股）製造）等。或者是使用纖維素酯膜以 • 外之環狀烯烴樹脂、丙烯酸樹脂、聚酯、聚碳酸酯等樹脂 . 膜亦可。在此場合，因爲矽化適性低，所以最好是透過適 當的黏接層黏接加工於偏光板。 前述偏光板，如前所述，作爲層積於偏光元件之至少 一方的表面側之保護膜，使用前述光學膜。此時，前述光 學膜作爲相位差膜發揮功能的場合，光學膜的遲相軸以實 0 質上平行或者直交於偏光元件的吸收軸的方式被配置爲佳 〇 此外，作爲前述偏光元件的具體例，例如可以舉出聚 . 乙烯醇系偏光膜。聚乙烯醇系偏光膜，有在聚乙烯醇系膜 使染上碘者與使染上二色性染料者。作爲前述聚乙烯醇系 膜’較佳爲使用以乙烯變性的變性聚乙烯醇系膜。 前述偏光元件’例如可如下述般進行而獲得。首先， 使用聚乙烯醇水溶液進行製膜。把所得到的聚乙烯醇系膜 〇 在單軸延伸後進行染色，或者在染色之後進行單軸延伸。 接著，較佳者爲以硼化合物施以耐久性處理。 前述偏光元件的膜厚，以5〜4 〇 y m爲佳，又以5 ~ 30/zm更佳，尤以5〜20#m最佳。 於該偏光元件的表面上’張貼纖維素酯系樹脂膜的場 合’最好是藉由完全鹼化聚乙烯醇等爲主成分的水系黏接 • 劑來貼合。此外，纖維素酯系樹脂膜以外的樹脂膜的場入 ’最好是透過適當的黏接層黏接加工於偏光板。 如前所述的偏光板’藉由使用像關於本實施型態的光 -31 - 201043560 學膜作爲偏光元件的透明保護膜，使前述光學膜在膜厚或 光學値等都是全體均一的，所以可得例如在適用於液晶顯 示裝置時，可實現對比等優異的液晶顯示裝置的高畫質化 的偏光板。進而’作爲偏光元件的透明保護膜使用的光學 膜，係使用藉由延伸步驟等所得到的寬寬幅的光學膜的場 合’亦可以適用於大畫面化的液晶顯示裝置。 (液晶顯示裝置） 相關於本實施型態的液晶顯示裝置，具備液晶胞、及 以夾住前述液晶胞的方式配置的2枚偏光板；前述2枚偏 光板之中至少一方，爲前述偏光板。又，液晶胞，係於一 對電極間塡充液晶物質者，藉由對此電極施加電壓，改變 液晶的配向狀態，使透過光量被抑制。這樣的液晶顯示裝 置，藉由使用相關於本實施型態的光學膜作爲偏光板用的 透明保護膜，使前述光學膜之膜厚或光學値等爲全體均一 者，所以可提供對比等被提高之高畫質的液晶顯示裝置。 此外，藉由使用相關於本實施型態的作爲光學膜之寬寬幅 者，使得大畫面化成爲可能。 以上，詳細說明相關於本發明之實施型態，但前述說 明，對所有的實施型態而言僅爲例示而已，本發明並不以 這些型態爲限。未例示的無數變形例，應解釋爲不脫離此 發明之範圍而可得被推定者。 [實施例] -32- 201043560 以下’舉實施例具體說明本發明，但本發明 爲限。Minolta Opto (manufacturing) and so on. Alternatively, a resin such as a cyclic olefin resin, an acrylic resin, a polyester, or a polycarbonate which is a cellulose ester film may be used. In this case, since the enthalpy is low in suitability, it is preferable to bond it to the polarizing plate through a suitable adhesive layer. As described above, the polarizing plate is used as a protective film laminated on the surface side of at least one of the polarizing elements. In this case, when the optical film functions as a retardation film, the slow axis of the optical film is arranged to be parallel or orthogonal to the absorption axis of the polarizing element, and is particularly preferable as the specific polarizing element. For example, a polyvinyl alcohol-based polarizing film can be mentioned. The polyvinyl alcohol-based polarizing film may be one in which iodine is dyed on a polyvinyl alcohol-based film and dyed with a dichroic dye. As the polyvinyl alcohol film, a modified polyvinyl alcohol film which is denatured with ethylene is preferably used. The polarizing element ' can be obtained, for example, as follows. First, a film was formed using an aqueous solution of polyvinyl alcohol. The obtained polyvinyl alcohol-based film 染色 is dyed after uniaxial stretching, or uniaxially stretched after dyeing. Next, it is preferred to apply a durability treatment to the boron compound. The film thickness of the polarizing element is preferably 5 to 4 〇 y m , more preferably 5 to 30/zm, and particularly preferably 5 to 20 #m. The field where the cellulose ester-based resin film is applied to the surface of the polarizing element is preferably bonded by a water-based adhesive which is a basic alkali metal hydroxide or the like as a main component. Further, it is preferable that the field of the resin film other than the cellulose ester resin film is bonded to the polarizing plate through a suitable adhesive layer. The polarizing plate as described above is uniform in film thickness or optical enthalpy by using a transparent protective film such as the light-31-201043560 film of the present embodiment as a polarizing element. Therefore, for example, when applied to a liquid crystal display device, a polarizing plate having a high image quality of a liquid crystal display device excellent in contrast can be obtained. Further, the optical film used as the transparent protective film of the polarizing element can be applied to a liquid crystal display device having a large screen by using a wide-width optical film obtained by an extending step or the like. (Liquid crystal display device) The liquid crystal display device according to the present embodiment includes a liquid crystal cell and two polarizing plates arranged to sandwich the liquid crystal cell, and at least one of the two polarizing plates is the polarizing plate. . Further, the liquid crystal cell is charged with a liquid crystal substance between a pair of electrodes, and by applying a voltage to the electrode, the alignment state of the liquid crystal is changed, so that the amount of transmitted light is suppressed. In such a liquid crystal display device, by using the optical film according to the present embodiment as a transparent protective film for a polarizing plate, the film thickness or optical enthalpy of the optical film is uniform, so that comparison can be improved. High-quality liquid crystal display device. Further, by using the wide and wide film as the optical film relating to the present embodiment, it is possible to make a large screen. The embodiments of the present invention have been described in detail above, but the foregoing description is merely illustrative of all embodiments, and the present invention is not limited to these. Numerous modifications not illustrated are to be construed as being presumed without departing from the scope of the invention. [Embodiment] -32-201043560 The following is specifically described by way of examples, but the invention is limited thereto.
實施例A 在實施例A ’係針對前述第1配管之前述風 的部分的剖面積，以從上游側往下游側變小的方 剖面積不同的2種配管的場合進行檢討。[Example A] The cross-sectional area of the portion of the wind in the first pipe was examined in the case where the two types of pipes having different cross-sectional areas from the upstream side to the downstream side were examined.
GG
[實施例1] (塗料的調製） 首先，對放入二氯甲烷418質量部（份）之 作爲透明性樹脂添加1 00質量部之三乙酸纖維素 醯基置換度：2.88)，進而，添加8質量部之磷 ，4 質量部之聯苯磷酸二苯酯（biphenyl phosphate)(液體之可塑劑），1質量部之5-氯 〇 二-sec-丁基-2-羥苯基）-2H-苯並三唑（液體之 收劑），0.1質量部之二氧化矽微粒子（Aerozyl R972V )及23質量部的乙醇。又，二氧化矽微粒 分散於乙醇的狀態添加的。接著，使液溫升溫至 攪拌3小時。藉由如此，可得三乙酸纖維素樹脂 後，結束攪拌，放置至液溫降到43 °C。接著’把 脂溶液以濾過精度〇 · 〇 〇 5 mm的濾紙進行過濾。藉 後的樹脂溶液放置一晚，使樹脂溶液中的氣泡脫 此而獲得的樹脂溶液，作爲塗料使用，如下述般 並不以此 送風流通 式，連接 溶解槽， 樹脂（乙 酸三苯酯 diphenyl -2- ( 3,5-紫外線吸 (音譯） 子，係以 8 0〇C 後， 溶液。其 得到的樹 由把過濾 泡。把如 製造光學 -33- 201043560[Example 1] (Preparation of the coating material) First, the amount of the cellulose triacetate substituted by a weight of 100 parts by weight of 406 parts by mass of methylene chloride was added to the transparent resin: 2.88), and further, 8 parts of phosphorus, 4 mass parts of biphenyl phosphate (liquid plasticizer), 1 part by mass of 5-chloroindole di-sec-butyl-2-hydroxyphenyl)-2H - benzotriazole (liquid collector), 0.1 part by mass of cerium oxide microparticles (Aerozyl R972V) and 23 parts by mass of ethanol. Further, the cerium oxide fine particles are added in a state of being dispersed in ethanol. Next, the temperature of the liquid was raised until it was stirred for 3 hours. Thus, after the cellulose triacetate resin was obtained, the stirring was terminated, and the temperature was lowered to 43 °C. Then, the lipid solution was filtered through a filter paper having a filtration accuracy of 〇 · 〇 〇 5 mm. After the borrowed resin solution is left overnight, the resin solution obtained by removing the bubbles in the resin solution is used as a coating, and is not connected to the dissolution tank as described below, and the resin (triphenyl acetate diphenyl-) 2- (3,5-UV-absorbing (transliteration) sub-system, after 80 ° C, solution. The resulting tree is filtered by a bubble. Put as optical -33- 201043560
(光學膜之製造） 首先’把得到的塗料的溫度調整爲3 5。(：，使無 支撐體的溫度調整爲25°C。接著，使用如圖1所示 膜製造裝置"由流延t旲（衣架模；coat-hanger die 料流延至搬送速度60m /分鐘之不銹鋼製且硏磨爲 的無端皮帶所構成的無端皮帶支撐體。藉由如此， 皮帶支撐體上形成網（web )，使其乾燥而搬送。 把網由無端皮帶支撐體剝離作爲膜，在9 0 °C之環境 輥搬送同時使其乾燥，在殘留溶媒量爲1 0%時，使 裝置（張布機；tenter )在100°C的環境下以握把把 兩端同時在寬幅方向上延伸1.40倍。其後，使用 置，裁斷以握把把持的區域（由膜端起60mm之寬 得到厚度40±10以m之光學膜。此時，被裁斷的厚 10//m之端部膜被插入第1配管內，藉由切斷裝置 細片。作爲第1配管，於上游側使用1 5 0 A之鋼管 部分的剖面積約爲1 8900mm2)，於下游側連接而 空部分的剖面積約爲2700mm2之鋼管，於下游側端 接著切斷裝置。又，以第1配管的上游側之風速成 /秒的方式進行抽吸。 [實施例2〜6及比較例1 ] 實施例2〜6，及比較例1除了使用於下游側的 端皮帶 的光學 )使塗 超鏡片 於無端 接著， 下進行 用延伸 持膜的 裁斷裝 幅）， 度40土 切斷爲 (中空 使用中 部被連 爲10m 鋼管， -34- 201043560 改用中空部分的剖面積係如表1所示的剖面積的鋼管以外 ' ，其餘與實施例1相同。 . 實施例1〜6以及比較例1係如下述般進行評估。 (施加於端部膜之張力） 藉由張力計測定被搬送於前述導引輥53與前述導引 輥對42之間的端部膜的張力，將其張力評估爲對端部膜 施加的張力。 〇 (拍黏寬幅） 藉由設置於第1配管之上游側的鋼管與下游側的鋼管 之連接部附近的攝影手段，攝影被搬送於第1配管內的端 . 部膜。接著，從該攝影的影像，以完全沒有拍黏的狀態之 膜爲基準，測定由該基準位置起之被搬送於第1配管內的 膜的最大移動距離。把該測定的最大移動距離的2倍定爲 拍黏寬幅（m m )。 (膜切細） Ο 被搬送於第1配管內的端部膜，直到被搬送至切斷裝 置爲止，藉由目視確認是否發生端部膜的破斷。 (搬送性） 端部膜的搬送性，係以下述基準進行評估。 ◎:不發生膜切細，拍黏寬幅爲1 〇mm以下 〇：拍黏寬幅超過1 Omm，而在30mm以下 • X :發生膜切細，拍黏寬幅超過3 Omm。 評估的結果顯示於表1。 -35- 201043560 〇 ◎ ◎ ◎ ◎ 〇 X S m 摧 摧 壊 摧 壊 « a 錤ε ο ο ο ο 習d ^ S S "a I» S ^ 葙e u ο υο CN CN ο CN ν〇 1—Η cs to CS ο ΟΟ 1¾^ 寸 卜 in (N ο ^Τ) On Ο Ο ϊ—Η m m 键}s ! 卜is 5 ο ο 卜 CN Ο η cn yr) CN 寸 Ο ιη 卜 ο ο ν〇 CN Ο Ο Ο ΟΟ Ο ο Os 00 m m ^ 態IS | 13 5 ο ο 〇\ 00 O o Os 00 o o On OO ο ο ΟΝ ΟΟ Ο ο Ον 00 Ο ο Ό\ 00 Ο ο Ον 00 _ S m \ M a § 沄 沄 ΙΟ ιη ο Ο τ-Η 留 u (N 辑 IK ΓΟ Jg 佩 寸 習 IK m m 遛 u 習 1¾ 鎰 由表1可知，第1配管內之風送風由上游側往下游側 變快的場合（實施例1〜6 )，與不變快的場合（比較例1 )相比，被搬送於第1配管內的端部膜的搬送性優異。 這種情況，應該是藉由使搬送前述端部膜時所使用的 -36- 201043560 風送風的風速，由前述第1配管的上游側 ’即使不整體提高風送風的風速，在拍黏 . 可以抑制端部膜的拍黏的方式使風送風的 1配管的中央部所致的效果。如此般藉由 中央部的風送風，應該可以有效果地抑制 又’第1配管內之風送風並沒有由上 快的場合（比較例1 )，會發生膜切細。 0 第1配管內之風送風並沒有由上游部往下 (比較例1 )，端部膜的拍黏情況嚴重。 的狀態，係在垂直於端部膜的搬送方向的 使端部膜伸縮的力’亦即張力的狀態。亦 • 的狀態下搬送端部膜的場合’應該是在垂 送方向的方向上’由端部膜的拍黏所產生 端部膜。總之’應該是於端部膜上’藉由 力，被附加於藉由搬送產生的張力’因而 〇 加的張力。 此外，前述下游側（下游側端部）之 游側（上游側端部）的剖面積之比率（下 爲1 5〜8 5 %的場合（實施例2〜5 )’與不 實施例1)或超過85%的場合（實施例6 於'第1配管內的端部膜的搬送性優異。(Manufacture of optical film) First, the temperature of the obtained paint was adjusted to 35. (: The temperature of the unsupported body was adjusted to 25 ° C. Next, using the film manufacturing apparatus as shown in Fig. 1), the casting was carried out to a conveying speed of 60 m / min by casting t 旲 (coating die; coat-hanger die material) An endless belt support made of stainless steel and honed endless belt. Thus, a web is formed on the belt support, and dried and transported. The web is peeled off from the endless belt support as a film. The environment roller at 0 °C is conveyed and dried at the same time. When the amount of residual solvent is 10%, the device (tenter) is placed in the environment of 100 ° C with the grip at both ends in the wide direction. The extension is 1.40 times. Thereafter, the area to be gripped by the grip is used (the optical film having a thickness of 40 ± 10 m is obtained from the film end by a width of 60 mm. At this time, the end of the cut thickness of 10/m is cut. The film is inserted into the first pipe and cut into thin pieces by the cutting device. As the first pipe, the cross-sectional area of the steel pipe portion of the 150° A is approximately 18,900 mm 2 on the upstream side, and the section is connected to the downstream side and the hollow portion is cut. A steel pipe with an area of about 2,700 mm2, and then cuts off the device at the downstream side. The suction was performed on the upstream side of the tube at a wind speed of / sec. [Examples 2 to 6 and Comparative Example 1] Examples 2 to 6 and Comparative Example 1 were used in addition to the optical belt of the end belt on the downstream side. The lens is cut without end, and the cutting frame is extended with a film. The degree of 40 soil is cut (the hollow middle portion is connected to a 10 m steel pipe, -34-201043560. The sectional area of the hollow portion is as shown in Table 1. The other than the steel pipe of the cross-sectional area was the same as in the first embodiment. The examples 1 to 6 and the comparative example 1 were evaluated as follows. (The tension applied to the end film) was measured by a tensiometer and conveyed to the foregoing. The tension of the end film between the guide roller 53 and the pair of guide rollers 42 is evaluated as the tension applied to the end film. 〇 (the viscous width) is provided on the upstream side of the first pipe The photographing means in the vicinity of the connection portion between the steel pipe and the steel pipe on the downstream side is imaged and conveyed to the end of the first pipe. The film is measured from the film of the photographed image without any sticking. Transferred from the reference position to the first match The maximum moving distance of the inner film is set to be twice the maximum moving distance of the measurement as the width (mm) of the sticking force. (The film is shredded) Ο is transported to the end film in the first pipe until it is transported to Before the cutting device, it was visually confirmed whether or not the end film was broken. (Transportability) The conveyance of the end film was evaluated based on the following criteria: ◎: The film was not shredded, and the width of the film was 1 〇mm or less 〇: The viscous width is more than 1 Omm, but less than 30mm. • X: The film is shredded and the viscous width is more than 3 Omm. The evaluation results are shown in Table 1. -35- 201043560 〇◎ ◎ ◎ ◎ 〇XS m 壊 壊 壊 a a ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN CN To CS ο ΟΟ 13⁄4^ inch inch in (N ο ^Τ) On Ο Ο ϊ Η mm key}s ! 卜 is 5 ο ο 卜 CN Ο η cn yr) CN 寸Ο ιη οο ο ν〇CN Ο Ο Ο ΟΟ Ο ο Os 00 mm ^ State IS | 13 5 ο ο 〇 00 O o Os 00 oo On OO ο ο Ο ο ο Ο 00 Ο ο 00 _ m ο 00 _ S m \ M a § 沄ι ιη ο Ο τ Η 留 u ( ( ( ( ( ( g IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK IK In the case of the example 1 to 6), the end film conveyed in the first pipe is superior in transportability as compared with the case where the film is not fast (Comparative Example 1). In this case, the end film should be conveyed. -36- 201043560 used in the wind, the wind speed of the wind is supplied by the upstream side of the first pipe, even if the wind speed of the wind blower is not increased as a whole, the sticking of the end film can be suppressed. The effect of the central portion of the air supply pipe 1 can be effectively suppressed by the wind blowing in the center portion, and the wind in the first pipe is not fastened (Comparative Example 1). The film is shredded. 0 The wind in the first pipe is not lowered from the upstream portion (Comparative Example 1), and the end film is severely stuck. The state is perpendicular to the conveying direction of the end film. The force for stretching and contracting the end film, that is, the state of tension. In the case where the end film is conveyed in the state of 'the same direction, 'the direction should be in the direction of the vertical direction'. The end film is produced by the sticking of the end film. 'It should be the tension which is added to the tension on the end film by the force generated by the conveyance on the end film. Further, the downstream side (upstream side end portion) of the downstream side (downstream side end portion) The ratio of the cross-sectional area (the case of 1 to 55% below (Examples 2 to 5)' and the case of Example 1) or more than 85% (Example 6 of the end film in the first pipe) Excellent transportability.
實施例B 胃g例J B，針對被接續於前述第1 起往下游側變快 變大的下游側， 方向朝向前述第 朝向前述配管的 拍黏。 游部往下游部變 這種情況，顯示 游部變快的場合 端部膜發生拍黏 方向上，被施加 即，在拍黏很大 直於端部膜的搬 的張力，施加於 此拍黏產生的張 提高對端部膜施 剖面積對前述上 游側/上游側） 滿1 5 %的場合（ )相比，被搬送 配管的下游側端 -37- 201043560 部的切斷裝置之前述風送風流通的部分的剖面積，比前述 第1配管的下游側之前述風送風流通的部分的剖面積還要 小的場合加以檢討。 [實施例7] (塗料的調製） 與實施例1同樣進行，調製塗料。 (光學膜之製造） 首先，把得到的塗料的溫度調整爲3 5 t，使無端皮帶 支撐體的溫度調整爲25t。接箸，使用如圖1所示的光學 膜製造裝置，由流延模（衣架模；coat-hanger die )使塗 料流延至搬送速度60m/分鐘之不銹鋼製且硏磨爲超鏡面 的無端皮帶所構成的無端皮帶支撐體。藉由如此，於無端 皮帶支撐體上形成網（web)，使其乾燥而搬送。接著， 把網由無端皮帶支撐體剝離作爲膜，在90<t之環境下進行 輥搬送同時使其乾燥，在殘留溶媒量爲1 〇 %時，使用延伸 裝置（張布機；tenter )在1 〇〇 °C的環境下以握把把持膜的 兩端同時在寬幅方向上延伸1·40倍。其後，使用裁斷裝 置’裁斷以握把把持的區域（由膜端起60mm之寬幅）， 得到厚度4〇±l〇//m之光學膜。此時，被裁斷的厚度40 土 10/zm之端部膜被插入第1配管內，藉由切斷裝置切斷爲 細片。此時，作爲被接續於第1配管的下游側端部的切斷 裝置，使用風送風流通的部分的剖面積約爲2 7 0 0 m m 2之切 斷裝置。又’以第1配管之風速成爲10m /秒的方式進行 -38- 201043560 抽吸。 . [實施例8〜12及比較例2] 實施例8〜12’及比較例2除了切斷裝置係使用於風 送風流通的部分的剖面積係如表2所示的剖面積的切斷裝 置代替以外，餘與實施例7相同。 實施例7〜1 2以及比較例2係如下述般進行評估。 0 (施加於端部膜之張力） 藉由張力計測定被搬送於前述導引輥5 3與前述導引 輥對42之間的端部膜的張力，將其張力評估爲對端部膜 施加的張力。 • (拍黏寬幅） ' 藉由設置於第1配管與切斷裝置之連接部附近的攝影 手段，攝影被搬送於第1配管內的端部膜。接著，於該攝 影的影像，以完全沒有拍黏的狀態之膜爲基準，測定由該 〇 基準位置起之被搬送於第1配管內的膜的最大移動距離。 把該測定的最大移動距離的2倍定爲拍黏寬幅（m m) ° (搬送性） 端部膜的搬送性，係以下述基準進行評估。 ◎:拍黏寬幅在1 〇mm以下 〇：拍黏寬幅超過l〇mm，而在3〇mm以下 • X :拍黏寬幅超過3 0 m m。 評估的結果顯示於表2。 -39- 201043560[Example B] The stomach g example J B is directed toward the downstream side where the downstream side becomes faster on the downstream side, and the direction is toward the first direction toward the pipe. When the swimming part changes to the downstream part, it shows that the end film is in the sticking direction when it is fastened, and the tension is applied to the end film when it is applied. The wind blown air of the cutting device of the downstream side end of the conveyance pipe -37-201043560 is compared with the case where the generated cross-sectional area of the end film is equal to 15% of the upstream side/upstream side) The cross-sectional area of the portion to be circulated is reviewed when the cross-sectional area of the portion of the downstream side of the first pipe on which the wind-driven air flows is smaller. [Example 7] (Preparation of paint) In the same manner as in Example 1, a coating material was prepared. (Manufacture of optical film) First, the temperature of the obtained coating material was adjusted to 35 t, and the temperature of the endless belt support was adjusted to 25 t. Next, using the optical film manufacturing apparatus shown in Fig. 1, the coating was cast by a casting die (coat-hanger die) to an endless belt made of stainless steel and honed to a super-mirror speed of 60 m/min. An endless belt support body. By doing so, a web is formed on the endless belt support, and it is dried and conveyed. Next, the net is peeled off from the endless belt support as a film, and the roll is conveyed and dried in an environment of 90 ° t. When the amount of residual solvent is 1%, an extension device (tenter) is used. In the environment of 〇〇 ° C, both ends of the grip holding film are simultaneously extended by 1.40 times in the wide direction. Thereafter, the cutting device was used to cut the region held by the grip (a width of 60 mm from the film end) to obtain an optical film having a thickness of 4 〇 ± 1 〇 / / m. At this time, the cut end film having a thickness of 40 m/zm was inserted into the first pipe, and was cut into fine pieces by a cutting device. In this case, as the cutting device connected to the downstream end portion of the first pipe, a cutting device having a cross-sectional area of about 2,700 m 2 is used in the portion through which the wind-driven air flows. Further, the suction speed of the first pipe is 10 m / sec. -38 - 201043560. [Embodiments 8 to 12 and Comparative Example 2] In the examples 8 to 12' and the comparative example 2, the cutting device is a cutting device having a sectional area of a portion where the wind-driven air flows, as shown in Table 2 The remainder is the same as that of the seventh embodiment. Examples 7 to 12 and Comparative Example 2 were evaluated as follows. 0 (tension applied to the end film) The tension of the end film conveyed between the aforementioned guide roller 53 and the pair of guide rolls 42 was measured by a tensiometer, and the tension was evaluated as being applied to the end film. The tension. • (Bumping width) The image is conveyed to the end film in the first pipe by means of an image pickup device provided in the vicinity of the connection portion between the first pipe and the cutting device. Then, the maximum moving distance of the film conveyed in the first pipe from the 基准 reference position is measured based on the film in the captured image. Two times the maximum moving distance of the measurement was defined as the tackiness (m m) ° (transportability) of the end film, and the evaluation was performed based on the following criteria. ◎: The stick width is less than 1 〇mm. 〇: The stick width is more than l〇mm, but below 3〇mm. • X: The stick width is more than 30 mm. The results of the evaluation are shown in Table 2. -39- 201043560
【(NS 搬送性 〇 ◎ ◎ ◎ ◎ 〇 X ! 拍黏寬幅 (mm) 〇 〇 〇 〇 對端部膜施 加之張力 (N/m2) 〇 〇 CN 〇 CN 〇 10.0 切斷裝置/ 第1配管 (%) 寸 卜 CN 〇 »〇 On 100 切斷裝置 剖面積 (mm2) 2700 3150 4725 7560 12600 丨 18000 1 18900 第1配管 剖面積 (mm2) 18900 18900 18900 18900 18900 丨 18900 18900 風速差 (m/s) § in ό 〇 實施例7 實施例8 實施例9 實施例10 實施例11 實施例12 比較例2 由表2可知，第1配管內之風送風之風速由上游側往 下游側變快的場合（實施例7〜1 2 )，與不變快的場合（ 比較例2 )相比，被搬送於第1配管內的端部膜的搬送性 優異 -40- 201043560 這種情況，應該是藉由使搬送前述端部膜時所使用的 風送風的風速，由前述第1配管的上游側起往下游側變快 . ’即使不整體提高風送風的風速，在拍黏變大的下游側， 可以抑制端部膜的拍黏的方式使風送風的方向朝向前述第 1配管的中央部所致的效果。如此般藉由朝向前述配管的 中央部的風送風，應該可以有效果地抑制拍黏。 又，第1配管內之風送風並沒有由上游部往下游部變 0 快的場合（比較例2)，會發生膜切細。這種情況，顯示 第1配管內之風送風並沒有由上游部往下游部變快的場合 (比較例2)，端部膜的拍黏情況嚴重。 此外，前述切斷裝置之風送風流通的部分之剖面積對 • 前述第1配管的剖面積之比率（切斷裝置/第1配管）爲 ' 1 5〜8 5 %的場合（實施例8〜1 1 )，與不滿 1 5 %的場合（ 實施例7 )或超過85 %的場合（實施例12 )相比’被搬送 於第1配管內的端部膜的搬送性優異。 Q 此外，前述實施例，係說明根據溶液流延法製造之實 施例，但根據融溶流延法之製造也可得到同樣的結果。 本說明書，雖如前述揭示種種型態之技術，但其中的 主要技術整理如下。 本發明之一個態樣，係具備··搬送膜同時裁斷垂直於 前述膜的搬送方向的方向上之至少一方之端部’藉由分離 • 被裁斷的端部膜’形成光學膜的裁斷步驟’及把被分離的 端部膜插入配管內’藉由風送在前述配管內搬送的搬送步 驟；於前述搬送步驟，使用於前述風送的風送風之風速’ -41 - 201043560 係由前述配管的上游側起往下游側變快爲其特徵 之製造方法。 根據前述般的構成’可以搬送膜，同時裁斷 ，製造光學膜，所以可以連續生產光學膜。接著 的光學膜的連續生產，可以提供藉由分離被裁斷 而得的光學膜圓滑地被搬送之生產效率高的光學 方法。 此情形可認爲是根據以下所述內容。 首先，被裁斷的端部膜被插入配管內，搬送 管內，所以即使是連續生產光學膜的場合，也應 前述端部膜偏離特定的搬送路徑。 此外，搬送於前述配管內的端部膜，一般而 前述配管上游側起越往下游側，拍黏變得越大的 部膜的拍黏很大時，會阻礙端部膜的圓滑搬送’ 分離端部膜而得的光學膜的圓滑的搬送。接著’ 此拍黏，而全體提高風送風的風速的話，可以抑 但是有產生端部膜破斷的傾向。端部膜破斷的場 阻礙端部膜的圓滑搬送。在此，藉由使搬送前述 所使用的風送風的風速，由前述配管的上游側起 變快，即使不整體提高風送風的風速，在拍黏變 側，也應該可以抑制端部膜的拍黏的方式使風送 朝向前述配管的中央部。如此般藉由朝向前述配 部的風送風，應該可以有效果地抑制拍黏。進而 體地提高風送風的風速，所以也應該可以抑制端 之光學膜 膜的端部 ，於這樣 的端部膜 膜之製造 於前述配 該可抑制 言，有從 傾向。端 阻礙藉由 爲了抑制 制拍黏， 合’更爲 端部膜時 往下游側 大的下游 風的方向 管的中央 ’因不整 部膜的破 -42- 201043560 斷。由以上情形，應該可以使搬送於前述配管內的 - 圓滑地搬送。 . 亦即，因爲可以抑制由於端部膜不能圓滑地搬 致的光學膜搬送被阻礙’所以應該可提供於搬送膜 裁斷膜的端部，而製造光學膜的方法，其藉由使分 端部膜所得到的光學膜，被圓滑地搬送之生產效率 學膜之製造方法。 0 此外，於前述光學膜之製造方法，前述風送風 配管的上游側端部之風速與前述配管的下游側端部 之風速差，最好爲〜50m/秒。 根據這樣的構成，可以更爲抑制端部膜的拍黏 . 以更圓滑地搬送端部膜。因而，可以更爲圓滑地搬 ' 分離端部膜所得到的光學膜。 此外，於前述光學膜之製造方法，前述配管之 送風流通的部分的剖面積’最好是由上游側往下游 〇 。 根據這樣的構成，不需要另行準備由上游側往 提高風送風的風速之用的手段，即可由前述配管的 往下游側提高風送風的風速。亦即，可以更容易抑 膜的拍黏等，可以更圓滑地搬送端部膜。因而，可 ' 易實現藉由分離端部膜所得到的光學膜之圓滑的搬: • 此外，於前述光學膜之製造方法，最好是具備 連接於前述配管的下游側端部的切斷手段，搬送前 膜同時進行切斷的切斷步驟；前述切斷手段之前述 端部膜 送所導 的同時 離前述 高的光 之前述 之風速 等，可 送藉由 前述風 側變小 下游側 上游側 制端部 以更容 舍。 藉由被 述端部 風送風 -43- 201043560 流通的部分的剖面積’比前述配管的下游側之前述 流通的部分的剖面積還要小。 根據這樣的構成，可以更爲抑制端部膜的拍黏 以更圓滑地搬送端部膜。因而，可以更爲圓滑地搬 分離端部膜所得到的光學膜。 這種情形，首先，應該是被接續於前述配管的 端部的切斷手段之前述風送風流通的部分的剖面積 所以使用於前述風送的風送風之風速’由前述配管 側起越往下游側變得越快所致。 此外，一般而言，端部膜的搬送，也會受到藉 切斷步驟所發生的端部膜的拍黏的影響。亦即，根 述般的構成，應該也可以抑制藉由被接續於配管的 端部的切斷手段所產生的端部膜之拍黏。 亦即，應該可以更爲抑制端部膜的拍黏，可以 地搬送藉由分離端部膜所得到的光學膜。 此外，於前述光學膜之製造方法，最好是具備 透明性樹脂的樹脂溶液流延於移動的支撐體上形成 延步驟，使前述膜由前述支撐體剝離的剝離步驟， 離的膜之延伸步驟，及把延伸的膜捲取成卷狀的捲 ;而前述裁斷步驟，係在前述剝離步驟之後，前述 驟之前進行的。 於可以進行這樣的膜的連續生產的溶液流延製 在前述剝離步驟之後，前述捲取步驟之前，藉由實 裁斷步驟，可以容易且生產效率高地製造端部被裁 風送風 等，可 送藉由 下游側 變小， 之上游 由前述 據如前 下游側 更圓滑 使含有 膜之流 延伸剝 取步驟 捲取步 膜法， 施前述 斷的光 -44 - 201043560 學膜。 • 此外，於根據如前述般的溶液流延製膜法之光學膜的 . 製造方法，前述裁斷步驟最好是在前述延伸步驟之後進行 。根據這樣的構成，可以容易地生產效率高地製造因延伸 步驟而變形的端部被裁斷的光學膜。 此外，於前述光學膜之製造方法，最好是具備使透明 性樹脂融溶的樹脂融溶液流延於移動的支撐體上形成流延 0 膜之流延步驟，使前述流延膜冷卻形成膜之冷卻步驟，使 前述膜由前述支撐體剝離的剝離步驟，延伸剝離的膜之延 伸步驟，及把延伸的膜捲取成卷狀的捲取步驟；而前述裁 斷步驟，係在前述剝離步驟之後，前述捲取步驟之前進行 . 的。 ' 於可以進行這樣的膜的連續生產的融溶流延製膜法， 在前述剝離步驟之後，前述捲取步驟之前，藉由實施前述 裁斷步驟，可以容易且生產效率高地製造端部被裁斷的光 〇 學膜。 此外，於根據如前述般的融溶流延製膜法之光學膜的 製造方法，前述裁斷步驟最好是在前述延伸步驟之後進行 。根據這樣的構成，可以容易地生產效率高地製造因延伸 步驟而變形的端部被裁斷的光學膜。 此外，本發明之另一態樣，係藉由前述光學膜之製造 ' 方法所得到的光學膜。 根據這樣的構成，於光學膜之製造中，因爲膜厚或光 學値等容易變成不均一的端部被裁斷了，所以可提供膜厚 -45- 201043560 或光學値等全體均一之光學膜。 此外，本發明之另一態樣，係具備偏光元件、被配置 於前述偏光元件之至少一方的表面上之透明保護膜的偏光 板，其中前述透明保護膜是前述光學膜爲其特徵之偏光板 〇 根據這樣的構成，作爲偏光元件的透明保護膜，被適 用膜厚或光學値等全體爲均一的光學膜，所以可得例如在 適用於液晶顯示裝置時，可實現對比等優異的液晶顯示裝 置之高畫質化的偏光板。進而，作爲偏光元件的透明保護 膜使用的光學膜，係使用藉由延伸步驟等所得到的寬寬幅 的光學膜的場合，亦可以適用於大畫面化的液晶顯示裝置 〇 此外，本發明之另一態樣，係具備液晶胞、及以挾住 前述液晶胞的方式被配置的2枚偏光板之液晶顯示裝置， 其特徵爲：前述2枚偏光板之中至少一方，係前述偏光板 〇 根據這般構成，因爲使用具備膜厚或光學値全體爲均 一的光學膜之偏光板，所以可實現對比等都優異的液晶顯 示裝置之高畫質化。進而，作爲偏光板的透明保護膜，使 用藉由延伸步驟等所得到的寬寬幅的光學膜的場合，可以 實現大畫面化。 [產業上利用可能性] 根據本發明，提供於搬送膜，同時裁斷膜的端部，製 -46- 201043560 造光學膜的方法，係藉由分離前述端部膜而得的光學膜被 - 圓滑地搬送之生產效率高的光學膜之製造方法。此外，提 . 供藉由這樣的光學膜之製造方法所得到的光學4膜、把前述 光學膜作爲透明保護膜使用的偏光板、以及具備前述偏光 板之液晶顯示裝置。 【圖式簡單說明】 Q 圖1係顯示本發明之一實施型態之根據溶液流延製膜 法之光學膜的製造裝置π的基本構成之槪略圖。 圖2係顯示前述光學膜之製造裝置11所具備的裁斷 裝置1 6的周邊之槪略立體圖。 • 圖3係顯示前述光學膜之製造裝置11所具備的切斷 ' 裝置44的周邊之槪略圖。 圖4係顯示本發明之另一實施型態之根據融溶流延製 膜法之光學膜的製造裝置2 1的基本構成之槪略圖。 〇 【主要元件符號說明】 11 :製造裝置 1 2 :無端皮帶支撐體 1 3 :流延模 1 4 :剝離輥 ' 1 5 :延伸裝置 16 :裁斷裝置 1 7 :乾燥裝置 -47- 201043560 1 8 :捲取裝置 1 9 :樹脂溶液（塗料） 41 :膜· 42 :導引輥對 43 :第1配管 44 :切斷裝置 45 :第2配管 46 :端部膜 47 :細片 53 :導引輥 -48[(NS transporting 〇 ◎ ◎ ◎ ◎ 〇X ! 拍 粘 (mm) 〇〇〇〇 Tension applied to the end film (N/m2) 〇〇CN 〇CN 〇10.0 Cutting device / 1st pipe (%) 寸卜CN 〇»〇On 100 Cutting device sectional area (mm2) 2700 3150 4725 7560 12600 丨18000 1 18900 First piping sectional area (mm2) 18900 18900 18900 18900 18900 丨18900 18900 Wind speed difference (m/s § in ό 〇 Example 7 Example 8 Example 9 Example 10 Example 11 Example 12 Comparative Example 2 As can be seen from Table 2, the wind speed of the wind blown air in the first pipe is increased from the upstream side to the downstream side. (Examples 7 to 1 2), the transportability of the end film conveyed in the first pipe is superior to that of the case where the film is not fast (Comparative Example 2) -40-201043560 The wind speed of the air blower used when transporting the end film is faster from the upstream side of the first pipe to the downstream side. 'Even if the wind speed of the wind blower is not increased as a whole, the downstream side of the squeezing is large The manner of suppressing the sticking of the end film is such that the direction of the wind blows toward the foregoing (1) The effect of the central portion of the pipe. Therefore, it is possible to effectively suppress the sticking of the air by the wind blowing toward the center of the pipe. Further, the air blown in the first pipe does not flow from the upstream portion to the downstream portion. When the temperature is changed to 0 (Comparative Example 2), the film is shredded. In this case, it is shown that the wind blowing air in the first pipe does not become faster from the upstream portion to the downstream portion (Comparative Example 2), the end film In addition, the cross-sectional area of the portion through which the air blows through the cutting device is the ratio of the cross-sectional area of the first pipe (cutting device/first pipe) is '1 5 to 8 5 %. In the case of the case (Examples 8 to 1 1), the conveyance of the end film conveyed in the first pipe is smaller than the case of the case of less than 15% (Example 7) or more than 85% (Example 12). Further, the foregoing examples illustrate the examples produced by the solution casting method, but the same results can be obtained by the melt casting method. The present specification, although the above-described various types of techniques are disclosed, But the main technical ones are organized as follows. One of the inventions In the aspect of the invention, the end portion of the at least one of the direction perpendicular to the conveyance direction of the film is cut and separated, and the end portion of the cut film is formed to form an optical film. In the end film insertion pipe, a conveying step of conveying in the pipe by the wind; in the conveying step, the wind speed of the wind blowing air used in the air blowing is -41 - 201043560 from the upstream side of the pipe The manufacturing method in which the downstream side becomes faster is characterized. According to the above-described configuration, the film can be conveyed and the optical film can be produced by cutting, so that the optical film can be continuously produced. The continuous production of the subsequent optical film can provide an optical method which is highly efficient in producing a smooth optical film by separating the cut optical film. This situation can be considered as follows. First, the cut end film is inserted into the pipe and conveyed inside the pipe. Therefore, even when the optical film is continuously produced, the end film is deviated from the specific transport path. In addition, the end film conveyed in the piping generally has a large sticking viscosity when the upstream side of the piping is on the downstream side, and the squeezing of the end film is hindered. The smooth transfer of the optical film obtained from the end film. Then, if the stick is sticky and the wind speed of the wind is increased as a whole, there is a tendency that the end film is broken. The field where the end film breaks hinders the smooth transfer of the end film. Here, the wind speed of the air blower to be used is increased from the upstream side of the pipe, and even if the wind speed of the wind blown air is not increased as a whole, the film of the end film should be suppressed on the side of the sticking. The sticking method causes the wind to be sent toward the central portion of the pipe. As a result of the wind blowing toward the aforementioned fitting portion, it is possible to effectively suppress the sticking. Further, since the wind speed of the wind blown air is increased, it is also possible to suppress the end portion of the optical film at the end, and there is a tendency to suppress the above-mentioned end film. In order to suppress the sticking, the center of the direction of the downstream wind which is larger toward the downstream side when the end film is formed is broken due to the break of the whole film -42- 201043560. In the above case, it should be possible to smoothly convey the conveyance in the pipe. In other words, since it is possible to suppress the conveyance of the optical film that is not smoothly conveyed by the end film, it is possible to provide the end portion of the film to cut the film, and to manufacture the optical film by making the end portion. The optical film obtained by the film is smoothly produced by a production method for producing a film. Further, in the method for producing an optical film, the wind speed of the upstream end portion of the air supply duct and the downstream end portion of the piping are preferably ～50 m/sec. According to such a configuration, the sticking of the end film can be further suppressed, and the end film can be conveyed more smoothly. Therefore, the optical film obtained by separating the end film can be more smoothly moved. Further, in the method for producing an optical film, the cross-sectional area ' of the portion through which the air is supplied from the pipe is preferably 由 from the upstream side to the downstream side. According to this configuration, it is not necessary to separately prepare a means for increasing the wind speed of the wind blown air from the upstream side, and the wind speed of the wind blown air can be increased from the downstream side of the pipe. That is, it is easier to suppress the sticking of the film, and the end film can be conveyed more smoothly. Therefore, it is possible to easily realize the smooth movement of the optical film obtained by separating the end film: Further, in the method for producing the optical film, it is preferable to provide a cutting means connected to the downstream end of the pipe. a cutting step of simultaneously cutting the front film; the wind speed of the high-speed light from the end of the cutting means, and the downstream of the downstream side of the wind side The side ends are more tolerant. The cross-sectional area of the portion through which the end portion of the wind is supplied to the wind-off wind-43-201043560 is smaller than the cross-sectional area of the portion on the downstream side of the pipe. According to such a configuration, it is possible to further suppress the sticking of the end film to convey the end film more smoothly. Therefore, the optical film obtained by separating the end film can be more smoothly transferred. In this case, first, it should be the cross-sectional area of the portion of the cutting means that is connected to the end portion of the pipe, and the wind speed of the wind blower used in the wind is downstream from the pipe side. The faster the side becomes. Further, in general, the conveyance of the end film is also affected by the sticking of the end film by the cutting step. In other words, in the configuration as described above, the sticking of the end film by the cutting means connected to the end portion of the pipe should be suppressed. That is, it is possible to more suppress the sticking of the end film, and it is possible to convey the optical film obtained by separating the end film. Further, in the method for producing an optical film, it is preferable that a resin solution having a transparent resin is cast on a moving support to form a stretching step, a peeling step of peeling the film from the support, and an extending step of the film. And winding the stretched film into a roll of the roll; and the cutting step is performed after the peeling step and before the step. The solution casting which can perform continuous production of such a film can be carried out after the above-described peeling step, and before the winding step, the end portion can be easily and efficiently produced by the cutting process. From the downstream side, the upstream is smoothed by the above-mentioned downstream side, and the film-containing flow extending and stripping step is taken up by the step film method to apply the broken light-44 - 201043560. Further, in the manufacturing method of the optical film according to the solution casting film forming method as described above, the cutting step is preferably performed after the extending step. According to such a configuration, it is possible to easily produce an optical film in which the end portion deformed by the stretching step is cut efficiently. Further, in the method for producing an optical film, it is preferable to provide a casting step of casting a resin melt solution in which a transparent resin is melted on a moving support to form a cast film, and cooling the cast film to form a film. a cooling step of a peeling step of peeling the film from the support, a step of extending the peeled film, and a winding step of winding the stretched film into a roll; and the cutting step is after the peeling step , before the aforementioned take-up step. A melt-cast casting film forming method capable of performing continuous production of such a film, after the peeling step, before the winding step, by performing the cutting step, the end portion can be easily and efficiently produced. Light pupil film. Further, in the method for producing an optical film according to the melt-cast casting film forming method as described above, the cutting step is preferably performed after the extending step. According to such a configuration, it is possible to easily produce an optical film in which the end portion deformed by the stretching step is cut efficiently. Further, another aspect of the present invention is an optical film obtained by the method of producing the optical film described above. According to such a configuration, in the production of the optical film, since the end portion which is likely to be uneven in film thickness or optical flaw is cut, it is possible to provide an optical film having a uniform thickness of -45 to 201043560 or an optical disk. Further, another aspect of the present invention provides a polarizing plate comprising a polarizing element and a transparent protective film disposed on a surface of at least one of the polarizing elements, wherein the transparent protective film is a polarizing plate characterized by the optical film. 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶High-quality polarizer. Further, when the optical film used as the transparent protective film of the polarizing element is a wide-width optical film obtained by an extending step or the like, it can be applied to a liquid crystal display device having a large screen. In another aspect, a liquid crystal display device including two liquid crystal cells and two polarizing plates arranged to sandwich the liquid crystal cell is characterized in that at least one of the two polarizing plates is the polarizing plate. According to this configuration, since a polarizing plate having a film thickness or an optical film having a uniform optical film is used, it is possible to achieve high image quality of a liquid crystal display device which is excellent in comparison and the like. Further, when a wide-width optical film obtained by an extending step or the like is used as the transparent protective film of the polarizing plate, a large screen can be realized. [Industrial Applicability] According to the present invention, it is provided that the film is conveyed and the end portion of the film is cut at the same time, and the method for producing an optical film is made of -46-201043560, and the optical film obtained by separating the end film is sleek A method for producing an optical film having high production efficiency. Further, an optical film obtained by the method for producing an optical film, a polarizing plate using the optical film as a transparent protective film, and a liquid crystal display device including the polarizing plate are provided. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the basic configuration of an apparatus π for manufacturing an optical film according to a solution casting film forming method according to an embodiment of the present invention. Fig. 2 is a schematic perspective view showing the periphery of a cutting device 16 provided in the optical film manufacturing apparatus 11. Fig. 3 is a schematic view showing the periphery of the cutting device 44 of the optical film manufacturing apparatus 11 described above. Fig. 4 is a schematic view showing the basic configuration of an apparatus for manufacturing an optical film according to a melt-cast casting film method according to another embodiment of the present invention. 〇[Main component symbol description] 11 : Manufacturing apparatus 1 2 : Endless belt support 1 3 : Casting die 1 4 : Peeling roll ' 1 5 : Extension device 16 : Cutting device 1 7 : Drying device -47 - 201043560 1 8 : Winding device 1 9 : Resin solution (paint) 41 : Film · 42 : Guide roller pair 43 : First pipe 44 : Cutting device 45 : Second pipe 46 : End film 47 : Thin piece 53 : Guide Roll-48