201235193 六、發明說明： C 明所屬技術領域;j 發明領域 本發明係有關於一種樹脂薄膜之製造方法及製造裝 置，尤其是有關於一種可消除所形成之樹脂薄膜因冷卻時 收縮所造成在寬度方向的滑動、並抑制薄膜之光學應變， 且減低光學應變之不均，藉以提升製品成品率的樹脂薄膜 之製造方法及製造裝置。 發明背景 使用於光學用途的樹脂薄膜，可廣泛地使用在例如光 碟、或與偏光板組合之液晶胞元、相位差薄膜、擴散薄膜、 及亮度提升薄膜等。為了使鱗使用於光學用㈣樹脂薄 膜展現預定的光學特性，必須盡可能地縮小製造時產生的 光學應變。 就使製造時產生的光學應變縮小之方法而言，眾知有 例如使-_的冷純⑻冷卻輥)溫度成為㈣於樹脂之 玻璃轉移溫度姐融溫度在預定溫度範圍來製造樹脂薄膜 =::Γ專利文獻1至2)。該等專利文獻Η中所 车 作為使表面平滑的樹脂薄膜之光學應變縮 小之手法而言相當有效。 "=面二光學樹脂薄膜而言，除Τ表面平滑的樹 曰^卜要樹脂薄膜表面形成有凹凸形狀且賦有 使光政射之魏者。1㈣，表㈣成有凹 201235193 脂薄膜係將已熔融之透明樹脂從模具擠出成薄膜狀後，炎 在外周面平滑的第1冷卻輥及外周面形成有凹凸形狀的第2 冷卻輥之間’使第2冷卻輥的凹凸形狀轉印再捲附至第2冷 卻輥後，以收回輥收回而獲得。 然而’若如專利文獻1、2中記載，將冷卻輥的溫度與 樹脂之玻璃轉移溫度賦予關聯來設定此種表面形成有凹凸 形狀的樹脂薄膜之成形條件，則在對夾入第1、第2冷卻棍 間之樹脂薄膜轉印凹凸形狀的過程中，存有光學應變增大 之問題。 爰此，針對具有凹凸形狀的樹脂薄膜，就使其製造過 程中之光學應變減低的方法’有提議一種使冷卻|昆與按壓 輥之周速度的關係甚至是與第2冷卻輥或收回輥之周速度 的關係滿足預定範圍’藉以降低光學應變之方法(例如，參 照專利文獻3及4)。 先前技術文獻 專利文獻 專利文獻1:日本特許第3754519號公報 專利文獻2:日本特開2007-301821號公報 專利文獻3:日本特開平4-224924號公報 專利文獻4 :日本特開2009-196327號公報 C 明内容]| 發明概要 發明欲解決之課題 然而’在如上述專利文獻3及4中所記載將周速度設在 201235193 預定範圍的方法中，由於樹脂薄膜之種類或厚度、及薄膜 之冷卻條件等一有變動便會使控制條件有所改變，因而有 作業呈複雜之問題。再加上，該等方法中可能會產生光學 應變之減低不夠充分之情況。 爰此，本發明係欲解決上述問題點者，其目的在於提 供一種可抑制表面已壓花加工有凹凸形狀的樹脂薄膜之光 學應變、並減少光學應變之參差的樹脂薄膜之製造方法及 製造裝置。 用以解決課題之機構 本發明人等為了解決上述課題而重複精闢研究的結果 發現：藉由在樹脂薄膜製造中抑制冷卻時樹脂薄膜的收 縮，可降低光學應變且抑制光學應變的參差而完成本發明。 即，本發明樹脂薄膜之製造方法之特徵在於具有：擠 出步驟，係將已熔融的熱可塑性樹脂（以下亦稱為熔融樹脂） 從模具擠出成薄膜狀後，使所擠出之薄膜狀的熔融樹脂供 給至冷卻輥與按壓機構之間，其中該冷卻輥係兩端部除外 的外周面形成有凹凸形狀，且前述兩端部之外周面業經鏡 面加工，該按壓機構則與前述冷卻輥隔著預定間隔配置， 又，前述供給係以薄膜狀的熔融樹脂之兩端部觸及前述冷 卻輥之業經鏡面加工的兩端部的方式進行；及冷卻成形步 驟，係以前述按壓機構將前述薄膜狀的熔融樹脂按推至前 述冷卻親，一邊冷卻前述 '熔融樹脂，一邊使前述冷卻I昆之 凹凸形狀轉印至表面，而使前述熔融樹脂成形為樹脂薄膜。 本發明之樹脂薄膜之製造裝置係具備：擠出機構，具 201235193 有將已炼融之熱可塑性樹脂擠出成薄膜狀之模具；及冷卻 成形機構’具備外周面形成有凹凸形狀之冷卻輥及與前述 冷卻輕隔著預定間隔配 置的按壓機構，該冷卻成形機構係 將業經前述擠出機構擠出之薄膜狀熔融樹脂夾壓於前述冷 部親與按壓機構之間，一邊冷卻前述熱可塑性樹脂一邊使 凹凸形狀轉印至表面；上述樹脂薄膜之製造裝置的特徵在 於·則述冷卻輥的凹凸形狀係形成在兩端部以外的外周 且則述兩i而部之外周面施有鏡面加工。 在該樹脂薄犋之製造方法及製造裝置中，按壓機構可 施有鏡面加工，亦可形成有凹凸形狀，只要配合欲製造之 樹脂薄膜區分使用即可。該按壓機構可為例如按壓輥、或 按壓帶’其相面施有凹凸雜以對擠出成薄膜狀的熱可 塑性樹脂表面賦予所期望的凹凸形狀。又，繼冷卻成形步 驟之後’進—步冷卻樹脂薄膜’以階段性冷卻樹脂薄膜為 發明效果 依據本發明之樹脂薄膜之製造方法及製造裝置，可藉 由在將擠出成薄膜狀熔融樹脂冷卻的期間，抑制薄膜狀^ 融樹脂在冷卻輥上往寬度方向收縮，而可抑制製造之樹月匕 薄膜的光學應變，其結果可降低相位差。又，依據本發^ 之樹脂薄膜之製造方法及製造裝置’亦可抑制獲得之樹脂 薄膜在寬度方向的相位差參差。此外，因無需縮小冷卻親 的溫度範圍，故而作業性良好，且因易於控制霧度(Haze) 與表面形狀轉印率，故生產性亦佳。 201235193 所以’獲得的樹脂薄膜之品質（光學特性)均勻且製品可 靠性提升，又，在獲得之樹脂薄膜中可作為製品使用:區 域極廣，成品率非常良好。 圖式簡單說明 第1圖係顯示本發明樹脂薄膜之製造裝 —— ^ 、且 < —貫施形 態概略圖。 苐2圖係顯示本發明讀用之冷卻輕之外周面消印 的構成概略圖。 第3圖係顯示在第！圖之製造裝置中，藉由冷卻觀而轉 印表面形狀之樹脂薄膜的構成概略圖。 第4圖係顯示本發明樹脂薄膜之製造裝置之其他實施 形態概略圖。 第5圖係顯示本發明樹脂薄膜之製造装置之另—個其 他實施形態概略圖。 、 第6圖係顯示實施例1中所獲得之樹脂薄膜之寬度方向 位置與相位差（阻滯）的關係圖。 第7圖係‘ .，、貝不比較例1中所獲得之樹脂薄膜之寬度方向 位置與相位差（阻⑻的關係_。 【實施方式】 用以實施發明之形熊 月中的祕脂為熱可塑性樹脂，以非晶性埶 可塑性樹脂為佳。如l 士 例如有：聚碾、聚苯乙烯、聚碳酸酯、 聚氣乙烯％狀聚烯烴、聚曱基丙烯酸甲酯(PMMA)、乙酸 纖維素樹脂等。哕望也 中’又從透明性優異、固有雙折射率 201235193 或光彈性係數小、且在熔融擠出成形中所要求的耐熱性亦 佳之觀點看來，適合使用環狀聚烯烴之降莰烯系樹脂、或 聚碳酸酯》 而，在本發明中，上述樹脂以透明樹脂為佳，此時，「透 明」表示作為兩表面平滑且厚度100μπι之薄片時的全光線 穿透率在80%以上。 該等中，又從光學特性良好之觀點看來，可適合使用 聚甲基丙烯酸曱酯(ΡΜΜΑ)、芳香族聚碳酸酯樹脂、及環狀 聚烯烴樹脂之降莰烯系樹脂。 上述熱可塑性樹脂中，可視需要添加添加劑。 就添加劑而言，一般有用以使含於樹脂薄膜中而使用 的公知添加劑，如：紫外線吸收劑、界面活性劑、耐衝擊 劑、抗靜電劑、抗氧化劑、滑劑、脫模劑、難燃劑、染料、 及顏料等著色劑等。 為了從如上述之原料製造樹脂薄膜，例如，可使用如 第1圖所示之樹脂薄膜之製造裴置卜該裝置具有：由擠出 機2及模具3所構成之擠出機構；及由第丨冷卻輥4與作為按 壓機構的按職5所構成之冷卻成形機構，且還由用以冷: 樹脂薄膜之第2冷卻輥6及進—步將已冷卻之樹脂薄膜輪送 至後段的輸送輥7所構成，前述擠出機2係用以將熱可塑性 樹脂加熱熔融並擠出，前述模具3係將熔融狀態的熱可塑性 樹脂成形為薄膜狀。又，前述第丨冷卻輥4係從上下爽撐薄 膜狀熱可塑性樹脂使之一邊往輸出方向旋轉一邊冷郜，且 使其外周面之形狀轉印而作為樹脂薄膜者。 201235193 擠出機2係藉由將上述樹脂原料加熱溶融而使熱可塑 性樹脂呈均質狀態者，可使用與一般擠出成形法中所使用 者具有相同結構者。例如，如第丨圖所示，將使用顆粒乾燥 器或計量進料斗8從上部所供給之熱可塑性樹脂，藉由旋轉 之螺桿進行加熱熔融並壓送至模具3。 模具3係將已從擠出機2壓送至且已縣的熱可塑性樹 脂在炼融狀態下擠出成形為薄膜狀者，-般係使用T型模 具。模具3可為將1種炫融樹脂單層擠出的單層模具，亦可 為分別獨立使從擠出機2廢送的2種以上溶融樹脂積層且一 起擠出的多層模具，如進料塊模(feed_b丨〇ckdie)、及多歧管 模(multi-manifold die)等。從模具3擠出的薄膜狀熔融樹脂 係夾在如下説明中相對向配置於上下的第丨冷卻輥4與按壓 輥5之間。 第1冷卻輥4為例如直徑250〜1000mm左右且外周面形 成為凹凸形狀的金屬製輥。具體而言，可舉可使流體、蒸 氣等通過輥内部並控制輥表面溫度的金屬輥，例如：模輥、 紋面親、及中空結構之螺型輥等。該等金屬輥之外周面藉 由喷砂或雕刻等而形成有預定的凹凸形狀，可轉印至從擠 出機2擠出後逐漸冷卻且固化的薄膜狀熱可塑性樹脂上。 形成於第1冷卻輥4之外周面的凹凸形狀除最大粗度 (Rmax)在0.1~10μηι之編繞形狀以外，可依照用以使期望特 性具備之凹凸形狀等及被要求具有功能之樹脂薄膜，而採 用期望的凹凸形狀及凹凸圖案，如：間距或高度在 Ιμιη〜3mm之稜鏡形狀、雙凸透鏡形狀或透鏡形狀等。最大 201235193 粗度（Rmax)係依據JIS B〇6〇丨_2〇〇丨以表面粗度計加以測定 而獲得之值。 如第2圖中從第1冷卻輥4之輥軸的垂直方向所見之圖 顯示，上述凹凸形狀係於第1冷卻輥4之外周面當中，僅形 成在兩端部除外的中央部4a部分的外周面。若將該凹凸形 狀轉印至成為製品的樹脂薄膜表面，可獲得具有與上述第t 冷卻輥4之凹凸形狀呈反轉凹凸形狀的表面形狀之樹脂薄 膜。又，第1冷卻輥4之外周面之令，兩端部牝施有鏡面加 工0 如此一來，藉由先將第丨冷卻輥4之兩端部仆鏡面加 工，可使樹脂薄膜50與該鏡面部分密接而與冷卻時產生的 樹脂薄膜50之收縮力對抗，使樹脂薄膜之兩緣部拘束在第t 冷卻輥上。藉此，可抑制樹脂薄膜50的兩緣部往輥中央方 向之收縮。在此’鏡面加工表示將外周面之最大粗度(Rmax) 設在〇·8μηι以下之範圍内使其可與樹脂薄膜密接之加工。只 要Rmax為Ο.ίμιη，在實用上即足矣。 此時，鏡面加工之範圍係設為使被捲附的樹脂薄膜之 兩端部從第1冷卻輥4之兩端重疊至内側。例如，該鏡面加 工之區域與樹脂薄膜之重疊分別在寬度方向3〇mm以上為 佳’在可有效抑制樹脂薄膜之收縮並增加成為製品之範圍 的觀點上，以50~100mm較佳。又，在生產性等觀點上，鏡 面加工之範圍以設為從端部離第1冷卻親4之面長的 5〜20°/。(例如，以全長1600mm之冷卻輥的情況而言，設為一 端80〜320mm)為佳。鏡面加工之範圍可設為左右端不同， 201235193 如右端150mm且左端200mm等，但理想為左右端相同，戍 左右端之差在50mm以内為佳。而，輥之面長表示在第2圖 中輥4之軸方向的最大長度。 又，該第1冷卻輥4之溫度控制可藉由控制流通於内部 之流體溫度等PID控制或ON-OFF控制等公知的控制方法， 來控制第1冷卻輥4之表面溫度即可。 按壓輥5係例如直徑250〜1000mm左右且外周面由彈性 體所構成之按壓報，如橡膠輥、或金屬彈性親等。 在此，橡膠輥例如有：矽橡膠輥或氟橡膠輥等，為了 提升脫模性，亦可採用混有砂者《橡膠輥之硬度可適當採 用依據JISK6253測义在蕭氏硬度A5〇。〜A90。之範圍。為了 將橡膠輥之硬度設為上述預定值，例如可藉由調整構成橡 膠輥之橡膠的交聯度或組成而任意進行。 在此，金屬彈性輥例如有：輥之内部以橡膠所構成者、 或有注入流體者等，其外周部係、以具有可撓性之金屬製薄 膜所構成。具體而言’例如在發橡膠輥有被覆厚度❿^爪 左右的圓筒形不鏽鋼製薄膜者'或有注入水或油等流體者 之中，具有以輥端部㈣定厚度2〜w左右的不鑛鋼製圓 筒形薄膜並將流體封入於内部之結構。 該按壓親5係構成為可進行溫度㈣，為了將橡膠親及 已在橡膠輥被覆圓筒形金屬製薄膜之金屬彈,_予以溫度 控制，例如將備份冷卻輥組裳至純即可。又，為了將已 於内部有封人流體之金屬彈叫予以溫度控制，例如，藉 由HD控制或ON傭㈣等公知的控制方絲控制流體溫 201235193 度即可。 此種按壓輥5中，只要金屬彈性輥的金屬製薄膜或橡膠 輥之表面形狀係依照欲製造之樹脂薄膜加以選擇即可。 即，在僅壓花加工樹脂薄膜之一面時，可將按壓觀5之外周 面作為平滑狀，而在壓花加工樹脂薄膜之兩面時，使按壓 輥5之外周面與第1冷卻親4同樣地設有凹凸形狀即可。於樹 脂溥膜之兩面進行壓花加工時，按壓輥5之外周面的凹凸形 狀與第1冷卻輥4之外周面的凹凸形狀可為相同圖案，亦可 為不同圖案。 而且’按壓輥5與第1冷卻輥4係隔著預定間隔而平行配 置，s亥預定間隔係可將第1冷卻輥4及按壓輥5之表面形狀盡 可能轉印至從上述模具3所擠出之薄膜狀熔融樹脂的距 離。該預定間隔只要適當設定為各輥的表面形狀可充分轉 印至被擠出之薄膜狀熔融樹脂即可。 第2冷卻輥6為例如直徑250〜1000mm左右，為金屬輥、 橡膠輥等可控制外周面溫度的冷卻輥。該第2冷卻輥6屬於 任意構成’亦可構成為藉由後述的輸送輥7直接輸送已由第 1冷卻輥4及按壓輥5轉印表面形狀的樹脂薄膜50。 然而，若使已藉由第1冷卻輥4及按壓輥5而轉印有表面 形狀的樹脂薄膜50捲附至第1冷卻輥4並同步通過該第2冷 卻輥6,可使樹脂薄臈5〇階段性地緩慢冷卻，因此較可縮小 樹脂薄膜50之光學應變。此外，藉由捲附至第1冷卻輥4， 可穩定確保逐漸固化的熱可塑性樹脂與第1冷卻輥4之外周 面的接觸時間而使凹凸形狀穩定轉印。 12 201235193 第2冷卻輥6只要如上述為可進行溫度控制者，即未有 特別限定，例如，可採用自習知在擠出成形中所使用之冷 卻輥。具體例而言，例如有：模輥、紋面輥或螺型輥等。 第2冷卻輥6之表面只要可使已冷卻且固化的樹脂薄膜5〇穩 定捲附而不致滑脫，即未有特別限制，可呈平滑，亦可具 有凹凸形狀。而，還可使用第3、第4、…等多數的冷卻輥 進一步階段性且穩定地進行冷卻。 輸送輥7為直徑90〜150mm左右，以例如金屬輥、橡膠 輥等而形成。該輸送輥7只要可將已冷卻的樹脂薄膜5 〇穩定 地輸送至後段即可，其外周面可呈平滑，亦可形成為凹凸 形狀。 而，該等第1冷卻輥4、按壓輥5、第2冷卻輥6及輸送輥 7為了穩定地進行將輥之表面形狀轉印至從擠出機2擠出的 薄膜狀熱可塑性樹脂上、冷卻作為樹脂薄膜後再將其收回 而輸送至後段之作業，其輥之寬度宜大於擠出之樹脂薄膜 的寬度’例如’比樹脂薄膜寬度大50〜i〇0mm左右為宜。 又，為了視需求對樹脂薄膜5〇施行各種處理以作成製 品，亦可於輸送輥7後段設置檢查製品厚度的X射線測定機 構、異物檢查機構、遮罩薄膜之插入機構、及切斷機構等。 此外，若有設置可在途中使薄膜暫時滯留之積儲器等其他 軋輥類，便可因應作業線的一部分緊急停止等情況，可謂 理想。 接下來，就本發明之樹脂薄膜之製造方法，以使用第i 圖之樹脂薄模之製造裝置1的情況為例作説明。 13 201235193 在本發明中’首先’將藉由顆粒乾燥器或計量進料斗8 從上部供給的熱可塑性樹脂加贿融，再㈣由旋 所熔融的熱可塑性樹脂（熔融樹脂）從擠出機2壓送至模具 3，然後從模具3將熔融樹脂擠出成薄膜狀。所擠出之薄膜 狀熔融樹脂係被夾在上述之第1冷卻輥4與按壓親5之間' 而 使第1冷卻輥4與按壓輥5的外周面形狀轉印。 在此’在第1冷卻親4及按壓链5中，在轉印觀之外周面 的凹凸形狀的同時’薄膜狀騎樹脂被冷卻並施行冷卻成 形步驟，使凹凸形狀固定於表面，且薄膜形狀穩定而作為 樹脂薄膜5〇。但，在樹脂之特性上，該冷卻期間會產生收 縮且主要疋樹月曰，專膜在寬度方向的收縮會對製品特性帶 來影響。 即’若如習知’冷卻輕4之外周面為全面凹凸形狀，則 樹脂薄膜會滑過報表面而收縮且薄膜寬度變小，此時，在 輥之兩端側樹脂薄膜的滑動报大且收縮程度會因所在位置 而有所不同。如此-來，獲得的樹脂薄膜之光學特性在中 央部與兩端部將有差異而無法獲得均質的樹脂薄膜。 另一方面，若如本申請發明將第1冷卻觀4之外周面的 兩端面予以鏡面加工’與第1冷卻親4之鏡面部分辦目接觸 的樹脂薄膜之兩端部便與第_密接，樹脂薄膜可在對抗 收縮力的m冷部。’可有效地抑制樹脂薄膜在冷卻 夺產生的寬度方向之收縮’使中央部與兩端部之光學特性 不會有太大變化而獲得均質的樹脂薄膜。 士此而轉P有凹凸形狀的樹脂薄膜係於捲附至第1 14 201235193 冷卻輥4後’進—步捲附至第2冷卻輥6而冷卻。再來，在捲 附至第2冷卻輥6時，樹脂薄膜5〇係藉由輸送輥7而進一步輸 送至後段。 藉由輸送輥7輸送以後，視需求施行各種處理，最終由 捲怎等捲取作成滚筒狀物品而成為製品。在此，視需求的 處理例如有：製品厚度的測定、異物檢查、遮罩薄膜插入、 及切斷等。 尤其，如第3圖所示，藉由本發明而獲得之樹脂薄膜5〇 係由轉印有凹凸形狀的中央部5如及形成為鏡面的兩端部 50b所構成。在該樹脂薄膜5〇中係中央部5〇&成為製品，因 此，宜藉由切斷機構等切斷不要的兩端部5〇b然後作成滾筒 狀物品。 又，藉由輸送輥7輸送的樹脂薄膜5〇，亦可並非作為滾 筒狀物品而是切斷成期望的大小當作單張片材處理。 又，為了盡可能地縮短從模具2至第1冷卻輥4及按壓觀 5之間、從第1冷卻輥4至第2冷卻輥6之間、及從第2冷卻輥6 至輸送輥7之間等未受支撐的時間以使製造時不會有多餘 的應力加諸到樹脂薄膜50，宜盡可能地縮小上述各距離。 所以，為了在沒有支撐物之處使樹脂薄膜5〇不會鬆開 並維持張力、且不會有延伸力加諸於樹脂薄膜5〇之流向而 獲得均質的製品，宜預先調整第1冷卻輥4、按壓輥5、第2 冷卻輥6、及輸送輥7等親的周速度。 由於有關各輥的周速度會受擠出機之吐出量及薄膜的 厚度或寬度左右，故未有特別限定，但一般以各輥皆在 15 201235193 5〜30m/分為佳。 又，若將熱可塑性樹脂的玻璃轉移點WTg表示，則第i 冷卻輥的表面溫度以設在（Tg_70〜Tg+3〇rc為佳，以設在 (Tg-60〜Tg+l〇)t較佳。又，按壓輥的表面溫度以設在 (Tg-100〜Tg_5〇)C為佳，以設在（Tg_9〇〜Tg_6〇)°c較佳。該 等表面溫度若過低，將無法充分進行第i冷卻輥4的凹凸形 狀之轉印，且會在樹脂薄膜50之凹凸形狀產生不均而無法 獲得充分的光學特性，又，表面溫度過高則會使光學應變 增大。 使用第2冷卻輥時，在穩定降低阻滞(相位差）之點上， 宜將第1冷卻輥的表面溫度設在(Tg-70〜Tg+30)°C，將按壓 輥的表面溫度設在(Tg-l〇〇〜Tg-50)°C，且將第2冷卻棍的溫 度設在(Tg-ΙΟΟ〜Tg-20)°C。 在第1圖所示之態樣中第2冷卻輥6係配置在第i冷卻輥 4的傾斜下方，若配置在第1冷卻輥4的鉛直下方亦可。又， 第1冷卻輥4與按壓輥5的位置可上下顛倒。此時，第2冷卻 輥6將配置在第1冷卻輥4的傾斜上方或鉛直上方。 此外，在第1圖中係從水平配置的模具3擠出熔融樹 脂’若如第4圖顯示從鉛直配置的模具3擠出熔融樹脂亦 可。此時，就按壓輥5而言，亦可適當使用金屬彈性輥或橡 膠輥等。 在第1圖及第4圖所示之態樣中，按壓機構係使用按壓 輥5，若如第5圖顯示使用按壓帶15作為按壓機構亦可。該 按壓帶15以金屬製的無接縫帶為佳，且以賦有凹凸形狀為 201235193 佳。在該知壓帶15中，與親相較之下，按壓時的接觸面積 大幅增加，對於應變之減低相當有效。 在第4圖及第5圖中，對於與第1圖中所記載之零件具有 相同功能之零件係賦予相同符號。 而’以本發明之裝置及方法而獲得之樹脂薄膜50係將 光學應曼一具體而言為藉由自動雙折射計在59〇nm中之阻 滞（以下亦稱為相位差卜之測定範圍中之最大值設在5〇nm 以下，理想在2〇nm以下，較理想在15nm以下，且以1〇nm 以下尤佳。阻滯以在前述範圍内且阻滯參差在2〇11〇1以下為 佳，前述參差在7nm以下較佳，又以前述參差在5nm以下尤 佳。而，在本說明書中，「阻滯參差」表示測定範圍中之最 . 大值與最小值之差。此時，測定範圍可設在例如離薄膜端 100mm之範圍（以下亦稱為薄膜端部）及離薄膜中央均等 50mm之範圍（以下亦稱為薄膜中央部）。在此，薄膜端係表 示在藉由前述本發明之製造方法所獲得之樹脂薄膜中，將 該樹脂薄膜與上述冷卻親之施有鏡面加工部分之兩端部的 接觸部分（第3圖中之5〇b的部分）予以切斷去除，或者連較該 接觸部分更内側的壓花加工區域之端部側亦予以切斷切除 時’剩餘之施有壓花加工的樹脂薄膜之寬度方向之端。 若重視薄膜之光學特性的均質性’離薄膜端l〇〇mm之 範圍内的薄膜端部之阻滯最大值，及離薄膜中央均等5〇mm 之範圍内的薄膜中央部之阻滯最大值皆在15nm以下為佳， 皆在13nm以下較佳，又以皆在i〇nm以下尤佳。而，此時， 薄膜端部之阻滯最大值與薄膜中央部之阻滯最大值無須相 17 201235193 同。例如’亦可為將薄膜端部之阻滯最大值設在15nm以下、 並將薄膜中央部之阻滞最大值設在1〇11111以下之相異值。 另外’以本發明之裝置及方法而獲得之樹脂薄膜50的 霧度值依用途而適當選擇即可。例如，在作為光擴散薄膜 時’一般以霧度值在50%以上為佳。 又，例如將樹脂薄膜50作為光擴散薄膜使用時，以本 發明之裝置及方法獲得之樹脂薄膜5〇的厚度宜在 30〜500μηι之範圍内。厚度一旦低於3〇μηι，在本發明之輥構 成中將無法穩定獲得樹脂薄膜5〇，超過5〇〇pm則難以作為 薄膜處理。樹脂薄膜5 〇之厚度可藉由從模具3擠出之薄膜狀 熔融樹脂的厚度、及第1冷卻輥4與按壓輥5之間隔等進行調 整。而，就樹脂薄膜50之寬度而言，例如以2〇〇〜2〇〇〇111111為 適當範圍。 另一方面，作為稜鏡或雙凸透鏡使用時，樹脂薄膜5〇 的厚度大致在500μιη〜2mm之範圍為佳，可依照要求的用途 進行適當設定。樹脂薄膜5〇的厚度超過5〇〇μϊη時，將變得 難以捲取至捲芯=而作為滾筒狀物品處理，因此自輸送輥7 輸送後宜切斷成期望的大小作為單張片材處理。 由於樹脂薄膜50表面有形成凹凸形狀而賦有使光散射 之功能，因此，除可適用在例如擴散薄膜、亮度提升薄膜 等以外，還可適用在汽車内裝用薄膜、照明用薄膜、及建 材用薄模4。又，就凹凸形狀而言，可藉由形成期望的棱 鏡形狀而適用在稜鏡片，又，可藉由賦予期望的透鏡形狀 而適用在透鏡片或雙凸透鏡片等。 201235193 實施例 以下，將藉由實施例進一步詳細説明本發明，惟，想 當然爾，本發明並非受限於該例。而，所使用之樹脂薄膜 之製造裝置構成如下。 •擠出機2 :螺桿徑長ii〇mm，單軸式。 •模具3 : T型模具、擠出嘴寬度1473ππη、嘴間隔 0.8mm。 •第1冷卻輥4 :不鏽鋼製金屬輥(模輥），外徑4〇〇ιηιηφ 且寬度1677mm。外周面内之兩端部分別以223.5mm之寬度 鏡面加工成最大粗度（Rmax)0.4pm，其以外的中央部（寬 123Omm)則藉由噴砂處理形成為最大粗度(Rmax)2|jm的凹 凸形狀。 •按壓輥5 :外徑300mm<|)且外周面研磨完成為最大粗 度(Ra)lpm的硬度A70°之矽橡膠輥。與第1冷卻輥4平行配 置。 •第2冷卻輥6 :外徑300mm<j)的耐熱橡膠製橡膠輥。 •輸送輥7 :外徑150ηιηιφ且由矽橡膠輥所構成之輸送 輥。 將擠出機2、模具3、第1冷卻輥4、按壓輕5、第2冷卻 挺6、輸送輥7配置成如第1圖顯示’並將第1冷卻輥4及按壓 輥5連接至電動馬達使其構成為可以預定的周速度進行旋 轉’而第2冷卻輥6及輸送輥7則未設置驅動力。 (貫施例1)201235193 VI. Description of the invention: C TECHNICAL FIELD The present invention relates to a method and a device for manufacturing a resin film, and more particularly to a method for eliminating the width of a resin film formed due to shrinkage during cooling. A method and a manufacturing apparatus for a resin film which improves the yield of a product by sliding in a direction and suppressing optical strain of the film and reducing unevenness in optical strain. Background of the Invention A resin film used for optical use can be widely used, for example, in a liquid crystal cell or a combination of a liquid crystal cell, a retardation film, a diffusion film, and a brightness enhancement film combined with a polarizing plate. In order for the scale to be used for optical (4) resin film to exhibit predetermined optical characteristics, it is necessary to reduce the optical strain generated at the time of manufacture as much as possible. In the method of reducing the optical strain generated at the time of manufacture, it is known that, for example, the temperature of the cold-purified (8) cooling roll of -_ is made into (4) the glass transition temperature of the resin is at a predetermined temperature range to produce a resin film =: : Γ Patent Documents 1 to 2). The vehicles disclosed in these patent documents are quite effective as a technique for reducing the optical strain of a resin film having a smooth surface. "=Face 2 optical resin film, except for the smooth surface of the Τ 曰 卜 要 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂 树脂1(4), Table (4) Formed with concave 201235193 The fat film is formed by extruding the molten transparent resin into a film shape from the mold, and then igniting between the first cooling roll having a smooth outer peripheral surface and the second cooling roll having the uneven shape formed on the outer peripheral surface 'The uneven shape of the second cooling roll is transferred and re-wound to the second cooling roll, and then taken back by the take-up roll. However, as described in Patent Documents 1 and 2, when the temperature of the cooling roll is correlated with the glass transition temperature of the resin, and the molding conditions of the resin film having the uneven surface formed thereon are set, the first and the second are sandwiched. 2 In the process of transferring the uneven shape of the resin film between the cooling bars, there is a problem that the optical strain increases. Accordingly, in the case of a resin film having a concavo-convex shape, the method of reducing the optical strain during the manufacturing process has been proposed to provide a relationship between the cooling rate and the peripheral speed of the pressing roller even with the second cooling roller or the retracting roller. The relationship of the circumferential speed satisfies the predetermined range 'method of reducing the optical strain (for example, refer to Patent Documents 3 and 4). CITATION LIST Patent Literature Patent Literature 1: Japanese Patent Laid-Open No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. In the method of setting the peripheral speed to a predetermined range of 201235193 as described in the above-mentioned Patent Documents 3 and 4, the type or thickness of the resin film and the cooling of the film are as follows. When the conditions are changed, the control conditions will be changed, and thus the operation is complicated. In addition, there may be cases where the reduction in optical strain is insufficient in these methods. As described above, the present invention has been made to solve the above problems, and an object of the invention is to provide a resin film manufacturing method and apparatus capable of suppressing optical strain of a resin film having a concave-convex shape on an embossed surface and reducing variations in optical strain. . In order to solve the above problems, the inventors of the present invention have repeatedly studied intensively, and found that by suppressing the shrinkage of the resin film during cooling in the production of the resin film, the optical strain can be reduced and the optical strain can be suppressed. invention. That is, the method for producing a resin film of the present invention is characterized in that it has an extrusion step of extruding a melted thermoplastic resin (hereinafter also referred to as a molten resin) from a die into a film shape, and then extruding the film. The molten resin is supplied between the cooling roller and the pressing mechanism, wherein the outer peripheral surface except the both ends of the cooling roller is formed with an uneven shape, and the outer peripheral surfaces of the both end portions are mirror-finished, and the pressing mechanism is the same as the cooling roller. The supply is performed so that both ends of the film-shaped molten resin touch the both ends of the mirror-finished surface of the cooling roll, and the cooling forming step is performed by the pressing means. The molten resin is transferred to the surface of the molten resin while being cooled, and the molten resin is transferred to the surface while the molten resin is cooled, and the molten resin is molded into a resin film. The apparatus for producing a resin film of the present invention comprises: an extrusion mechanism having a mold for extruding a fused thermoplastic resin into a film shape in 201235193; and a cooling forming mechanism having a cooling roll having an uneven shape on an outer peripheral surface thereof a cooling mechanism that is disposed at a predetermined interval between the cooling and cooling means, wherein the film-shaped molten resin extruded through the extrusion mechanism is sandwiched between the cold portion and the pressing mechanism to cool the thermoplastic resin The apparatus for manufacturing a resin film is characterized in that the uneven shape of the cooling roll is formed on the outer circumference other than the both end portions, and the outer peripheral surfaces of the two sides are mirror-finished. In the method and apparatus for producing a resin crucible, the pressing mechanism may be mirror-finished or formed into a concavo-convex shape, and may be used in combination with a resin film to be produced. The pressing mechanism may be, for example, a pressing roller or a pressing belt, which is provided with irregularities to impart a desired uneven shape to the surface of the thermoplastic resin extruded into a film form. Further, after the cooling forming step, the step of cooling the resin film is a stepwise cooling of the resin film, and the method and apparatus for producing the resin film according to the present invention can be cooled by extruding into a film-like molten resin. In the meantime, the film-like molten resin is suppressed from shrinking in the width direction on the cooling roll, and the optical strain of the manufactured ruthenium film can be suppressed, and as a result, the phase difference can be reduced. Further, according to the method and apparatus for producing a resin film of the present invention, the phase difference of the obtained resin film in the width direction can be suppressed. Further, since it is not necessary to reduce the temperature range of the cooling parent, the workability is good, and since the haze and the surface shape transfer rate are easily controlled, the productivity is also good. 201235193 Therefore, the quality (optical characteristics) of the obtained resin film is uniform and the reliability of the product is improved, and it can be used as a product in the obtained resin film: the area is extremely wide and the yield is very good. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the manufacturing apparatus of the resin film of the present invention - ^ and < Fig. 2 is a schematic view showing the configuration of the peripheral surface of the cooling light for reading in the present invention. Figure 3 is shown in the first! In the manufacturing apparatus of the drawing, a schematic view of the structure of a resin film having a surface shape is reproduced by cooling. Fig. 4 is a schematic view showing another embodiment of the apparatus for producing a resin film of the present invention. Fig. 5 is a schematic view showing another embodiment of the apparatus for producing a resin film of the present invention. Fig. 6 is a graph showing the relationship between the width direction position and the phase difference (blocking) of the resin film obtained in Example 1. Fig. 7 is a view showing the relationship between the position in the width direction of the resin film obtained in Comparative Example 1 and the phase difference (resistance (8). [Embodiment] The secret fat in the shape of the bear month for carrying out the invention is thermoplasticity. Resin, preferably amorphous non-plastic resin. For example, there are: poly-rolling, polystyrene, polycarbonate, polystyrene-like polyolefin, polymethyl methacrylate (PMMA), cellulose acetate. Resin, etc. It is also suitable for the use of cyclic polyolefin from the viewpoint of excellent transparency, intrinsic birefringence 201235193 or a small photoelastic coefficient, and good heat resistance required in melt extrusion molding. In the present invention, the resin is preferably a transparent resin. In this case, "transparent" means that the total light transmittance is a sheet having a smooth surface and a thickness of 100 μm. 80% or more. Among these, from the viewpoint of good optical properties, it is suitable to use a polydecene-based resin such as poly(methyl methacrylate), an aromatic polycarbonate resin, and a cyclic polyolefin resin. . In the above thermoplastic resin, an additive may be added as needed. In terms of an additive, a known additive such as an ultraviolet absorber, a surfactant, an impact resistance agent, an antistatic agent, or an antistatic agent is generally used for use in a resin film. A coloring agent such as an oxidizing agent, a lubricant, a mold release agent, a flame retardant, a dye, and a pigment, etc. In order to produce a resin film from the above-mentioned raw material, for example, a resin film as shown in Fig. 1 can be used. The apparatus has an extrusion mechanism composed of an extruder 2 and a die 3, and a cooling forming mechanism composed of a second cooling roller 4 and a pressing mechanism 5, and is also used for cooling: a resin film The second cooling roll 6 and the step of transferring the cooled resin film to the transport roller 7 in the subsequent stage, the extruder 2 is for heating and melting the thermoplastic resin, and the mold 3 is The thermoplastic resin in a molten state is formed into a film shape, and the second cooling roll 4 is cooled by one side of the upper and lower film-like thermoplastic resin while being rotated in the output direction, and the outer circumference is made In the case of the extruder 2, the thermoplastic resin is heated and melted to bring the thermoplastic resin into a homogeneous state, and the same structure as that of the user in the general extrusion molding method can be used. For example, as shown in the figure, the thermoplastic resin supplied from the upper portion using a pellet dryer or metering hopper 8 is heated and melted by a rotating screw and fed to the mold 3. The mold 3 will have been The extruder 2 is pressure-fed and the thermoplastic resin of the county is extruded into a film shape in a molten state, and a T-shaped mold is generally used. The mold 3 may be a single layer of a single molten resin. The single-layer mold may also be a multi-layer mold in which two or more kinds of molten resins scrapped from the extruder 2 are separately laminated and extruded together, such as a feed block mold and a multi-manifold mold ( Multi-manifold die) and so on. The film-like molten resin extruded from the mold 3 is interposed between the second cooling roller 4 and the pressing roller 5 which are disposed to face each other in the following description. The first cooling roll 4 is, for example, a metal roll having a diameter of about 250 to 1000 mm and an outer peripheral surface having an uneven shape. Specifically, a metal roll which can pass a fluid, a vapor, or the like through the inside of the roll and control the surface temperature of the roll, for example, a die roll, a grain surface, and a screw roll having a hollow structure can be mentioned. The outer peripheral surface of the metal rolls is formed into a predetermined uneven shape by sandblasting or engraving, and can be transferred onto a film-form thermoplastic resin which is gradually cooled and solidified after being extruded from the extruder 2. The concavo-convex shape formed on the outer peripheral surface of the first cooling roll 4 may be a resin film which is required to have a function such as a concavo-convex shape or the like for the desired characteristics, in addition to a shape in which the maximum thickness (Rmax) is 0.1 to 10 μm. The desired concavo-convex shape and concavo-convex pattern are used, such as a pitch or a height of Ιμηη~3 mm, a lenticular shape or a lens shape. The maximum 201235193 roughness (Rmax) is a value obtained by measuring the surface roughness according to JIS B〇6〇丨_2〇〇丨. As seen from the vertical direction of the roll axis of the first cooling roll 4 in Fig. 2, the uneven shape is formed on the outer peripheral surface of the first cooling roll 4, and is formed only in the central portion 4a except the both end portions. The outer perimeter. When the uneven shape is transferred to the surface of the resin film to be a product, a resin film having a surface shape having an inverted concave-convex shape with respect to the uneven shape of the t-th cooling roll 4 can be obtained. Further, in the outer peripheral surface of the first cooling roll 4, mirror processing 0 is applied to both end portions, and the resin film 50 can be formed by first processing the both ends of the second cooling roll 4 The mirror portions are in close contact with each other to counteract the contraction force of the resin film 50 generated during cooling, and the both edges of the resin film are restrained on the t-th cooling roll. Thereby, the contraction of both edge portions of the resin film 50 toward the center of the roller can be suppressed. Here, the mirror processing means that the maximum thickness (Rmax) of the outer peripheral surface is set to be within a range of 〇·8 μη or less so as to be in close contact with the resin film. As long as Rmax is Ο.ίμιη, it is practical enough. At this time, the range of the mirror surface processing is such that both end portions of the resin film to be wound are superposed on both sides from the both ends of the first cooling roll 4. For example, it is preferable that the overlap between the mirror-finished area and the resin film is 3 mm or more in the width direction, and is preferably 50 to 100 mm from the viewpoint of effectively suppressing shrinkage of the resin film and increasing the range of the product. Further, in terms of productivity and the like, the range of the mirror surface processing is 5 to 20 °/ which is longer than the surface of the first cooling parent 4 from the end portion. (For example, in the case of a cooling roll having a total length of 1600 mm, it is preferable to use one end of 80 to 320 mm). The range of mirror processing can be set to be different from left to right. 201235193 is 150mm at the right end and 200mm at the left end. However, it is preferable that the left and right ends are the same, and the difference between the left and right ends is preferably within 50mm. Further, the face length of the roll indicates the maximum length in the axial direction of the roll 4 in Fig. 2 . Further, the temperature control of the first cooling roll 4 can be controlled by a known control method such as PID control or ON-OFF control such as controlling the temperature of the fluid flowing inside, and the surface temperature of the first cooling roll 4 can be controlled. The pressing roller 5 is, for example, a pressing member having a diameter of about 250 to 1000 mm and an outer peripheral surface made of an elastic body, such as a rubber roller or a metal elastic member. Here, the rubber roller may be, for example, a rubber roller or a fluororubber roller. In order to improve the mold release property, the hardness of the rubber roller may be appropriately adopted. The hardness of the rubber roller may be suitably measured according to JIS K6253 at a hardness of A5. ~A90. The scope. In order to set the hardness of the rubber roller to the above predetermined value, for example, it can be arbitrarily carried out by adjusting the degree of crosslinking or composition of the rubber constituting the rubber roller. Here, the metal elastic roller may be, for example, a rubber or a liquid injecting into the inside of the roller, and an outer peripheral portion formed of a flexible metal film. Specifically, for example, in a case where the rubber roller has a cylindrical stainless steel film having a thickness of about 爪 claw, or a fluid such as water or oil, the roller end portion (four) has a thickness of about 2 to w. A cylindrical film made of non-mineral steel and sealed in a structure inside the fluid. The pressing member 5 is configured to be temperature-producible (4), and in order to apply the rubber to the rubber roller to cover the metal-shaped film of the cylindrical metal film, the temperature may be controlled, for example, the backup cooling roll group may be pure. Further, in order to control the temperature of the metal bomb having the sealed fluid inside, for example, the fluid temperature of 201235193 can be controlled by a known control wire such as HD control or ON commission (4). In the pressure roller 5, the surface shape of the metal film or the rubber roller of the metal elastic roller may be selected in accordance with the resin film to be produced. In other words, when only one surface of the resin film is embossed, the outer peripheral surface of the pressing view 5 can be made smooth, and when the both surfaces of the resin film are embossed, the outer peripheral surface of the pressing roll 5 is made the same as the first cooling pair 4 The ground is provided with a concave-convex shape. When embossing is performed on both sides of the resin film, the uneven shape of the outer peripheral surface of the pressing roller 5 and the uneven shape of the outer peripheral surface of the first cooling roll 4 may be the same pattern or different patterns. Further, the pressing roller 5 and the first cooling roller 4 are arranged in parallel at predetermined intervals, and the surface shape of the first cooling roller 4 and the pressing roller 5 can be transferred as much as possible from the mold 3 at a predetermined interval. The distance from the film-like molten resin. The predetermined interval may be appropriately set so that the surface shape of each roller can be sufficiently transferred to the film-formed molten resin to be extruded. The second cooling roll 6 is, for example, a diameter of 250 to 1000 mm, and is a cooling roll that can control the temperature of the outer peripheral surface such as a metal roll or a rubber roll. The second cooling roll 6 may be of any configuration. The resin film 50 may be directly transported by the first cooling roller 4 and the pressing roller 5 by the transport roller 7 to be described later. However, when the resin film 50 having the surface shape transferred by the first cooling roll 4 and the pressing roll 5 is wound around the first cooling roll 4 and simultaneously passed through the second cooling roll 6, the resin thin film 5 can be obtained. The crucible is slowly cooled in a stepwise manner, so that the optical strain of the resin film 50 can be made smaller. Further, by being wound up to the first cooling roll 4, it is possible to stably ensure the contact time between the gradually cured thermoplastic resin and the outer peripheral surface of the first cooling roll 4, and to stably transfer the uneven shape. 12 201235193 The second cooling roll 6 is not particularly limited as long as it can be temperature controlled as described above. For example, a cooling roll used in extrusion molding can be used. Specific examples include a die roll, a land roll, a screw roll, and the like. The surface of the second cooling roll 6 is not particularly limited as long as the cooled and cured resin film 5 is stably wound and not slipped, and may be smooth or have a concave-convex shape. Further, it is also possible to further cool the stage stepwise and stably using a plurality of cooling rolls such as the third, fourth, and the like. The conveying roller 7 has a diameter of about 90 to 150 mm and is formed, for example, by a metal roll or a rubber roll. The transport roller 7 can stably transport the cooled resin film 5 至 to the rear stage, and the outer peripheral surface thereof can be smooth or formed into a concave-convex shape. In order to stably transfer the surface shape of the roll to the film-form thermoplastic resin extruded from the extruder 2, the first cooling roll 4, the pressing roll 5, the second cooling roll 6, and the conveying roller 7 are stably transferred. After cooling as a resin film and then retracting it and transporting it to the subsequent stage, the width of the roll should be larger than the width of the extruded resin film 'for example, 50 to about 0 mm larger than the width of the resin film. In addition, in order to prepare a product for the resin film 5 视 according to the demand, an X-ray measuring mechanism, a foreign matter inspection mechanism, a mask insertion mechanism, a cutting mechanism, and the like for inspecting the thickness of the product may be provided in the subsequent stage of the conveying roller 7. . In addition, if there are other types of rolls such as a reservoir that can temporarily hold the film on the way, it is preferable to respond to an emergency stop of a part of the line. Next, a method of manufacturing the resin film of the present invention will be described by taking a case where the manufacturing apparatus 1 of the resin thin mold of the first embodiment is used. 13 201235193 In the present invention, the thermoplastic resin supplied from the upper portion by the pellet dryer or the metering hopper 8 is firstly bribed, and (4) the thermoplastic resin (molten resin) melted by the spinner is taken from the extruder 2 The pressure is sent to the mold 3, and then the molten resin is extruded from the mold 3 into a film shape. The extruded film-like molten resin is sandwiched between the first cooling roll 4 and the pressing member 5 described above, and the outer peripheral surfaces of the first cooling roll 4 and the pressing roll 5 are transferred in shape. Here, in the first cooling contact 4 and the press chain 5, the film-like riding resin is cooled and the cooling forming step is performed while the uneven shape of the outer peripheral surface of the transfer surface is transferred, and the uneven shape is fixed to the surface, and the film shape is formed. Stable as a resin film 5〇. However, in the properties of the resin, shrinkage occurs during the cooling period and the main eucalyptus is delayed, and the shrinkage of the film in the width direction affects the product characteristics. That is, if the peripheral surface of the cooling light 4 is a full-convex shape, the resin film will slide over the surface of the surface and shrink, and the film width becomes small. At this time, the sliding of the resin film on both end sides of the roller is large. The degree of contraction will vary depending on where you are. As a result, the optical characteristics of the obtained resin film are different between the center portion and the both end portions, and a homogeneous resin film cannot be obtained. On the other hand, according to the invention of the present invention, both end faces of the outer peripheral surface of the first cooling view 4 are mirror-finished, and both end portions of the resin film which is in contact with the mirror portion of the first cooling contact 4 are in close contact with the first surface. The resin film can be in the m cold portion against the contraction force. The shrinkage in the width direction of the resin film in the direction of cooling can be effectively suppressed, and the optical characteristics of the center portion and the both end portions are not greatly changed to obtain a homogeneous resin film. Thus, the resin film having the uneven shape of P is attached to the chill roll 4 of 201214193, and is rewound to the second cooling roll 6 to be cooled. Further, when wound up to the second cooling roll 6, the resin film 5 is further conveyed to the subsequent stage by the conveying roller 7. After being conveyed by the conveying roller 7, various processes are performed as needed, and finally, the roll is wound up into a roll-shaped article to become a product. Here, the processing according to requirements is, for example, measurement of product thickness, foreign matter inspection, mask film insertion, and cutting. In particular, as shown in Fig. 3, the resin film 5 obtained by the present invention is composed of a central portion 5 to which a concavo-convex shape is transferred, and both end portions 50b formed into a mirror surface. In the resin film 5, the center portion 5〇& is a product. Therefore, it is preferable to cut the unnecessary end portions 5〇b by a cutting mechanism or the like and form a roll-shaped article. Further, the resin film 5 输送 conveyed by the conveying roller 7 may be cut into a desired size as a single sheet processing instead of being a cylindrical article. Further, in order to shorten as much as possible from the mold 2 to between the first cooling roll 4 and the pressing view 5, from between the first cooling roll 4 to the second cooling roll 6, and from the second cooling roll 6 to the conveying roller 7. The unsupported time is such that no excessive stress is applied to the resin film 50 at the time of manufacture, and it is preferable to reduce the above respective distances as much as possible. Therefore, in order to obtain a homogeneous product without causing the resin film 5 to be loosened and maintain tension without a support, and without extending the force applied to the resin film 5, it is preferable to adjust the first cooling roll in advance. 4. The peripheral speed of the pressing roller 5, the second cooling roller 6, and the conveying roller 7 and the like. Since the peripheral speed of each roller is affected by the discharge amount of the extruder and the thickness or width of the film, it is not particularly limited, but generally, each roller is preferably divided into 15 201235193 5 to 30 m/. Moreover, when the glass transition point WTg of the thermoplastic resin is shown, the surface temperature of the i-th cooling roll is preferably set to be (Tg_70 to Tg+3〇rc, and is set to (Tg-60 to Tg+l〇)t. Preferably, the surface temperature of the pressing roller is preferably set at (Tg-100 to Tg_5 〇) C, and is preferably set at (Tg_9 〇 to Tg_6 〇) ° C. If the surface temperatures are too low, the temperature will not be obtained. When the uneven shape of the i-th cooling roll 4 is sufficiently transferred, the unevenness of the resin film 50 is uneven, and sufficient optical characteristics are not obtained, and when the surface temperature is too high, the optical strain is increased. 2 When cooling the roller, at the point of stably reducing the retardation (phase difference), it is preferable to set the surface temperature of the first cooling roller to (Tg - 70 to Tg + 30) ° C, and set the surface temperature of the pressing roller to ( Tg-l〇〇~Tg-50) ° C, and the temperature of the second cooling rod is set at (Tg - ΙΟΟ ~ Tg - 20) ° C. The second cooling roller 6 in the aspect shown in Fig. 1 It is disposed below the inclination of the i-th cooling roller 4, and may be disposed vertically below the first cooling roller 4. Further, the positions of the first cooling roller 4 and the pressing roller 5 may be reversed upside down. At this time, the second cooling roller 6 will match In the first drawing, the molten resin is extruded from the horizontally disposed mold 3, as shown in Fig. 4, as shown in Fig. 4, the molten resin may be extruded from the vertically disposed mold 3. In this case, a metal elastic roller or a rubber roller or the like can be suitably used for the pressing roller 5. In the first and fourth aspects, the pressing mechanism uses the pressing roller 5, as in the fifth. The figure shows that the pressing belt 15 can be used as the pressing mechanism. The pressing belt 15 is preferably a metal seamless belt, and the concave-convex shape is preferably 201235193. In the pressure-sensitive belt 15, in comparison with the parent The contact area at the time of pressing is greatly increased, and it is effective for reducing the strain. In FIGS. 4 and 5, the same reference numerals are given to the parts having the same functions as those of the parts described in Fig. 1. The resin film 50 obtained by the apparatus and method of the present invention is specifically the optical retardation block which is retarded by an automatic birefringence meter at 59 〇 nm (hereinafter also referred to as the maximum value of the phase difference measurement range). Set below 5〇nm, ideally at 2〇nm Preferably, it is below 15 nm, and preferably less than 1 〇 nm. The retardation is preferably within the above range and the retardation is below 2〇11〇1, and the aforementioned difference is preferably below 7 nm, and the aforementioned difference is In the present specification, the "blocking parameter" means the difference between the largest value and the minimum value in the measurement range. In this case, the measurement range can be set, for example, in the range of 100 mm from the film end (hereinafter also It is referred to as a film end portion and a range of 50 mm from the center of the film (hereinafter also referred to as a film center portion). Here, the film end indicates that the resin film obtained by the above-described production method of the present invention is used. The film is cut off from the contact portion (portion of 5〇b in FIG. 3) of the both ends of the mirror-finished portion to which the cooling is applied, or the end of the embossed processing region is further inside than the contact portion. The side of the portion is also cut at the end of the width direction of the resin film to which the embossing is applied. Pay attention to the homogeneity of the optical properties of the film, the maximum retardation of the film end in the range of l〇〇mm from the film end, and the maximum retardation of the central portion of the film in the range of 5〇mm from the center of the film. Both are preferably below 15 nm, preferably below 13 nm, and preferably below i 〇 nm. However, at this time, the maximum retardation of the film end portion and the maximum retardation value at the center portion of the film do not need to be the same as 201235193. For example, it is also possible to set the maximum value of the retardation of the film end portion to 15 nm or less, and set the maximum value of the retardation at the central portion of the film to a value different from 1 to 11111. Further, the haze value of the resin film 50 obtained by the apparatus and method of the present invention may be appropriately selected depending on the use. For example, when it is used as a light-diffusing film, it is preferable that the haze value is 50% or more. Further, for example, when the resin film 50 is used as a light-diffusing film, the thickness of the resin film 5〇 obtained by the apparatus and method of the present invention is preferably in the range of 30 to 500 μm. When the thickness is less than 3 〇μηι, the resin film 5 无法 cannot be stably obtained in the roll constitution of the present invention, and it is difficult to treat it as a film more than 5 pm. The thickness of the resin film 5 〇 can be adjusted by the thickness of the film-like molten resin extruded from the mold 3 and the interval between the first cooling roll 4 and the pressing roller 5. Further, the width of the resin film 50 is, for example, 2 〇〇 to 2 〇〇〇 111111 in an appropriate range. On the other hand, when used as a tantalum or a lenticular lens, the thickness of the resin film 5? is preferably in the range of approximately 500 μm to 2 mm, and can be appropriately set according to the intended use. When the thickness of the resin film 5〇 exceeds 5 μμϊ, it becomes difficult to take up to the core = and is treated as a roll-shaped article. Therefore, it is preferably cut into a desired size as a single sheet after being conveyed from the conveying roller 7 . Since the surface of the resin film 50 has a function of scattering light by forming an uneven shape, it can be applied to, for example, a film for interior use, a film for lighting, and a building material, in addition to a diffusion film or a brightness enhancement film. Thin mold 4. Further, the uneven shape can be applied to the cymbal sheet by forming a desired prism shape, and can be applied to a lens sheet or a lenticular lens sheet by imparting a desired lens shape. 201235193 EXAMPLES Hereinafter, the present invention will be described in further detail by way of examples, however, the present invention is not limited thereto. Further, the manufacturing apparatus of the resin film to be used is constituted as follows. • Extruder 2: Screw diameter ii 〇 mm, single shaft. • Mold 3: T-die, nozzle width 1473ππη, mouth spacing 0.8mm. • The first cooling roll 4: a stainless steel metal roll (die roll) having an outer diameter of 4 〇〇ιηιηφ and a width of 1677 mm. Both ends in the outer peripheral surface are mirror-finished to a maximum thickness (Rmax) of 0.4 pm with a width of 223.5 mm, and the other central portion (1230 mm wide) is formed into a maximum thickness (Rmax) 2|jm by grit blasting. Concave shape. • Pressing roller 5: outer diameter 300 mm <|) and the outer peripheral surface was polished to a maximum hardness (Ra) lpm hardness of A70°. It is arranged in parallel with the first cooling roll 4. • The second cooling roll 6: a heat-resistant rubber rubber roll having an outer diameter of 300 mm < j). • Conveying roller 7: a conveying roller composed of a rubber roller having an outer diameter of 150 ηιηιφ. The extruder 2, the mold 3, the first cooling roll 4, the pressing light 5, the second cooling stage 6, and the conveying roller 7 are arranged as shown in Fig. 1 and the first cooling roll 4 and the pressing roller 5 are connected to the electric motor. The motor is configured to be rotatable at a predetermined peripheral speed, and the second cooling roller 6 and the transport roller 7 are not provided with a driving force. (Example 1)
首先，藉由擠出機2將芳香族聚碳酸酯樹脂[住友DOW 19 201235193 公司製，商品名：Calibre 301-22 ;玻璃轉移點（Tg) : 155°C] 加熱至260 °C的溫度且進行熔融揑合所獲得的樹脂組成 物’將之直接在熔融狀態下從模具3擠出成薄膜狀。此時， 由於所獲得之薄膜寬度會在空中收縮，因此其小於模具3之 擠出嘴的寬度1473mm，成為13 80mm。該薄膜與擠出幸昆之 鏡面部的重疊係兩端部合計為1380-1230=150mm，而，__ 端部則分別為其兩端部的一半之75mm。 接下來，以使從模具3所擠出之薄膜狀樹脂組成物夾在 旋轉的第1冷卻輥4與按壓輥5之間的方式進行供給，一邊冷 卻薄膜狀樹脂組成物一邊使第1冷卻報4的凹凸形狀轉印至 其表面而成形為樹脂薄膜《又一邊將該樹脂薄膜捲附至第2 冷卻輥6 ’ 一邊藉由輸送輥7依序輸送至後段進行冷卻。第1 冷卻輥4、按壓輥5、及第2冷卻輥6在内部有冷卻水循環使 其維持在一定的溫度下’而各循環水的設定溫度分別為97 C ' 45°C、137°C。此時’第1冷卻輥4的表面溫度約95。(：， 按壓輥5的表面溫度約70°C，且第2冷卻親ό的表面溫度約 13〇°c。 在第3圖之50a的狀態下，在通過第2冷卻輥6的樹脂薄 膜5〇進行取樣，以獲得寬度1380mm且厚度ΐ3〇μπι的樹脂薄 膜。而，在此所獲得之樹脂薄膜在厚度精度上亦佳，在此 為 ΐ3〇μηι±1μΓη。 (比較例1) 將第1冷卻輥作為外周面之全面具有凹凸形狀者，除此 以外使用與實施例1具有相同構成的樹脂薄膜之製造裝 20 201235193 置，並在同於實施例1的條件下獲得樹脂薄膜。 (試驗例） 就實施例1及比較例1中所獲得的各樹脂薄膜，針對比 未經鏡面加工之輥中央部分1230mm更中央部分1200mm， 測定阻滯的位置分布，並將其結果分別顯示在第6圖及第7 圖。 [阻滯] 樹脂薄膜的阻滯係藉由自動雙折射計（王子計測機器 股份有限公司製，商品名：KOBRA-CCD/X)測定在590nm 之值。 從上述試驗例之結果看來，實施例1中所獲得之樹脂薄 膜在測定範圍中之阻滯最大值約7nm，相對的，比較例1中 所獲得之最大值約18nm。實施例1之阻滯參差約6nm，相對 的，比較例1之阻滯參差約11 nm，可知參差有變大。 又，實施例1中，相對於薄膜端部的阻滯最大值約5nm， 在薄膜中央部的阻滯最大值約7nm，可知光學的均質性相當 高。另一方面，比較例1中，相對於薄膜端部的阻滯最大值 約18nm，在薄膜中央部的阻滯最大值約9nm，與實施例1相 較之下，其光學的均質性有變差。即，由上述可知，藉由 本製造法，可輕易地獲得阻滯小且光學均質性相當高的薄 膜。 因此，依據本發明，就冷卻報而言，僅需使用將外周 面之兩端面予以鏡面加工的簡便結構之輥，即可獲得薄膜 表面賦有凹凸形狀且光學應變小的樹脂薄膜。而，在實施 21 201235193 例1中’即便在48小時連續成形的情況下，樹脂薄膜的阻滯 仍在10nm以下且偏差亦穩定在5nm以内。 產業上之可利用性 依據本發明之樹脂薄膜之製造方法及製造裝置，可抑 制冷卻親上往薄膜狀炼融樹脂之寬度方向的收縮，藉以抑 制製造之樹脂薄膜的光學應變而使相位差降低，並可抑制 獲得之樹脂薄膜的相位差在寬度方向的參差，而可均質且 製造成品率優良地製造各種用途的樹脂薄膜。 而，在此引用於2011年1月28日所申請之日本專利申請 案2011-016687號之說明書、專利申請範圍、圖式及摘要之 全内容，並納入作為本發明之揭示。 【圃式^簡琴·說》明】 第1圖係顯示本發明樹脂薄膜之製造裝置之一實施形 面（轉印面) 第2圖係顯示本發明中使用之冷卻輥之外周 的構成概略圖》 藉由冷仰轉而轉 第3圖係顯示在第丨圖之製造裝置中 印表面形狀之樹脂薄膜的構成概略圖。 置之其他實施 第4圖係顯示本發明樹脂薄膜之製造裝 形態概略圖。 之另一個其 之寬度方向 第5圖係顯示本發明樹脂薄膜之製造裝置 他實施形態概略圖。 第6圖係顯示實施例丨中所獲得之樹脂薄膜 位置與相位差（阻滯）的關係圖。 、 22 201235193 第7圖係顯示比較例1中所獲得之樹脂薄膜之寬度方向 位置與相位差（阻滯）的關係圖。 【主要元件符號說明】 1···製造裝置 2…擠出機 3…模具 4···第1冷卻輥 4a、50a…中央部 4b、50b."兩端部 5···按壓輥 6···第2冷卻報 7…輸送輥 8…計量進料斗 15…按壓帶 50…樹脂薄膜 23First, an aromatic polycarbonate resin [manufactured by Sumitomo Dow 19 201235193, trade name: Calibre 301-22; glass transfer point (Tg): 155 ° C] was heated by an extruder 2 to a temperature of 260 ° C and The resin composition obtained by melt-kneading is extruded from a mold 3 into a film form directly in a molten state. At this time, since the obtained film width was shrunk in the air, it was smaller than the width of the nozzle of the mold 3 by 1473 mm, and became 13 80 mm. The overlap between the film and the mirror surface of the extruded Xingkun is 1380-1230=150 mm, and the __ end is 75 mm of the half of both ends. Then, the film-like resin composition extruded from the mold 3 is supplied between the first cooling roller 4 and the pressing roller 5, and the first cooling film is cooled while cooling the film-like resin composition. The uneven shape of 4 is transferred to the surface thereof to be molded into a resin film. The resin film is wound up to the second cooling roll 6' while being conveyed to the subsequent stage by the transport roller 7 to be cooled. The first cooling roll 4, the pressing roll 5, and the second cooling roll 6 have a cooling water circulation therein to maintain the temperature at a constant temperature, and the set temperatures of the respective circulating waters are 97 C '45 ° C and 137 ° C, respectively. At this time, the surface temperature of the first cooling roll 4 was about 95. (: The surface temperature of the pressing roller 5 is about 70 ° C, and the surface temperature of the second cooling parent is about 13 ° C. In the state of 50 a of Fig. 3, the resin film 5 passing through the second cooling roller 6 The crucible was sampled to obtain a resin film having a width of 1380 mm and a thickness of 〇3 μm, and the resin film obtained here was also excellent in thickness precision, here ΐ3〇μηι±1 μΓη. (Comparative Example 1) The first In the same manner as in Example 1, the resin film was obtained under the same conditions as in Example 1 except that the cooling roll was formed into a resin film having the same configuration as that of Example 1 except that the outer peripheral surface had a concavo-convex shape. With respect to each of the resin films obtained in Example 1 and Comparative Example 1, the positional distribution of the retardation was measured for a central portion of 1,230 mm from the central portion of the roller which was not mirror-finished, and the results were shown in Fig. 6 respectively. And Fig. 7. [Resistance] The retardation of the resin film is measured at 590 nm by an automatic birefringence meter (manufactured by Oji Scientific Instruments Co., Ltd., trade name: KOBRA-CCD/X). The result seems to be implemented The maximum retardation of the resin film obtained in the measurement range was about 7 nm, and the maximum value obtained in Comparative Example 1 was about 18 nm. The retardation of Example 1 was about 6 nm, and Comparative Example 1 The retardation is about 11 nm, and it is known that the variation is large. Further, in Example 1, the maximum value of the retardation with respect to the end portion of the film is about 5 nm, and the maximum retardation at the central portion of the film is about 7 nm, and optical homogenization is known. On the other hand, in Comparative Example 1, the maximum value of the retardation with respect to the end portion of the film was about 18 nm, and the maximum value of the retardation at the central portion of the film was about 9 nm, which was optical compared with Example 1. The homogeneity is deteriorated. That is, from the above, it is known that the film having a small retardation and a relatively high optical homogeneity can be easily obtained by the present manufacturing method. Therefore, according to the present invention, in the case of the cooling report, only the outer periphery is used. A resin film having a simple structure in which the both ends of the surface are mirror-finished can obtain a resin film having a concave-convex shape on the surface of the film and having a small optical strain. However, in the case of Example 21 201235193, "even in the case of continuous molding for 48 hours, the resin Thin film The lag is still 10 nm or less and the deviation is also stabilized within 5 nm. INDUSTRIAL APPLICABILITY According to the method and apparatus for producing a resin film of the present invention, it is possible to suppress shrinkage in the width direction of the film-like smelting resin by cooling. By suppressing the optical strain of the resin film to be produced, the phase difference is lowered, and the phase difference of the obtained resin film can be suppressed from being uneven in the width direction, and the resin film of various uses can be produced in a uniform manner and excellent in yield. The entire contents of the specification, the patent application, the drawings and the abstract of Japanese Patent Application No. 2011-016687, filed on Jan. 28, 2011, are hereby incorporated by reference. [Fig. 1] shows a configuration of a resin film of the present invention (transfer surface). Fig. 2 is a schematic view showing the configuration of the outer circumference of the cooling roll used in the present invention. The third embodiment is a schematic view showing the configuration of a resin film having a printed surface shape in the manufacturing apparatus of the second drawing. Other Embodiments Fig. 4 is a schematic view showing the manufacturing form of the resin film of the present invention. The other width direction of the fifth embodiment is a schematic view showing a manufacturing apparatus of the resin film of the present invention. Fig. 6 is a graph showing the relationship between the position of the resin film obtained in Example 与 and the phase difference (blocking). 22 201235193 Fig. 7 is a graph showing the relationship between the width direction position and the phase difference (blocking) of the resin film obtained in Comparative Example 1. [Explanation of main component symbols] 1···Production apparatus 2...Extruder 3...Mold 4···1st cooling roller 4a, 50a...Center part 4b, 50b." Both ends 5···pressing roller 6 ···2nd cooling report 7...conveying roller 8...metering feeding hopper 15...pressing belt 50...resin film 23