200928421 九、發明說明： 【發明所屬之技術領域】 本發明係關於-種偏光膜製造方法；具體^言，本發 明係關於一種供液晶顯示器（liquid crystal display， LCD)使用之偏光膜之製造方法。 【先前技術】 偏光膜的品質是影響液晶顯示器包含對比、可視角、 色彩飽和度、暗態、色偏等顯示效果的重要因素之一。 較佳的偏光膜品質可提升液晶顯示器的顯示效果。 習知偏光膜之製造方法包含將聚乙烯醇（p〇lyvinyl alcohol，PVA)經過染色、固色、拉伸以及烘乾步驟後， 將二醋酸纖維（tri-acetyl cellulose, TAC)保護層及 聚環烯煙尚分子（cycloolefin polymer, C0P)保護層分 別黏於兩侧，再分別於三醋酸纖維保護層之一侧及聚環 烯烴高分子保護層之一側貼上表面保護膜及離型膜即完 成。 由於偏光膜係以不同材質之光學膜貼合而成，不同材 質之光學膜貼合之效果好壞會直接影響偏光膜之品質， 進而影響液晶顯示器的顯示效果。光學膜貼合效果好壞 的評估指標之一係為偏光膜翹曲之發生及程度。若翹曲 狀況較多或翹曲程度較大’使用此偏光膜進行片貼時易 6 200928421 發生無法片貼或貼合缺陷之情形。因此，當光學膜貼合 後偏光膜發生翹曲的狀況較少或翹曲程度較小，偏光膜 的品質即較佳。 【發明内容】 本發明之主要目的在於提供一種偏光膜製造方法，供 減少偏光膜翹曲之發生。 ❹ 本發明之另一主要目的在於提供一種偏光膜，具有較 少之翹曲狀況。 本發明之偏光膜製造方法步驟包含：以第一張力拉伸 第一保護膜；以第二張力拉伸第二保護膜；將第一保護 膜及第二保護膜分別貼合於基底膜二側；以第三張力拉 伸第二保護膜；將第三保護膜貼合於第一保護膜相對於 基底膜之另侧，以形成複合膜；以及以第四張力拉伸複 ❹合膜以形成偏光膜。其中，第一張力與第三張力之乘積 除以第二張力與第四張力之乘積之比值係介於〇. 015至 8之間。 拉伸步驟包含使用滾軸捲收。第一保護膜係為三醋酸 纖維。第二保護膜係為聚環烯烴高分子。基底膜係為聚 乙浠醇其中，基底膜之單體穿透率係大於Μ%、偏光度 係高於99. 9%，厚度係介於2〇至35_。第三保護膜係 為聚對苯二甲酸乙二醇酯。 偏光膜製造方法進-步包含在基細與第一保護膜 200928421 及第二保護賴合前’對基底膜進行親理。預處理步 驟包含在溫度介於坑至35。⑶水愤行_，以及 在溫度介於25°C至5()。⑽含有4量百鲜3. G至5. 5之 爾以及«百分率2. 〇至6· Q之视鉀之雜中，拉 伸使基底膜之長度成為原本長度之4至7倍。 偏光膜製造方法進-步包含在基底膜與第一保護膜 及第二保護膜貼合前，對第—保護膜進行4化處理。偏 光膜製造方法進-步包含在基底膜與第—保護膜及第二 保護膜貼合前，對第二保護膜進行表面改質。 貼合步驟包含使用聚乙烯醇高分子作為貼合劑。貼合 步驟包含使聚氨基憎乙g旨（pQlyureth·)作為貼 合劑。偏細製紗法進-純含對帛—倾膜進行霧 面處理（anti-glare treatment)。偏光膜製造方法進一 步包含對第一保護膜進行高精細霧面處理（ anti-glare treatment)。偏光膜製造方法進一步包含對 第一保護膜進行硬鍍膜處理（hard_c〇ating treatment)° 本發明之種偏光膜包含基底膜、第一保護膜、第二保 護膜以及第三保護膜。其中，第一保護膜係經第一張力 拉伸後貼合於基底膜之一侧。第二保護臈係經第二張力 拉伸後貼合於基底膜相對於第一保護膜之另側。第三保 護膜係經第三張力拉伸後貼合於第一保護臈相對於基底 膜之另側。偏光膜係經第四張力拉伸，且第一張力與第 8 200928421 二張力之乘積除以第二張力與第四張力之乘積之比值係 介於0. 015至8之間。 【實施方式】 本發明係提供一種偏光膜製造方法，以及使用此偏光 膜製造方法製造之偏光膜。 圖1及圖2分別為本發明之偏光膜製造方法實施例示 意圖及實施例流程圖。如圖1所示，在較佳實施例中， 滾軸400、第一滾軸410、第二滚軸420及第三滾軸430 係分別捲收基底膜100、第一保護膜110、第二保護膜120 及第二保護膜130。第一槽體51 〇係為染色槽。第二槽體 520係為固色拉伸槽。乾燥裝置53〇則供烘乾膜片之用。 第一捲收滾轴310可將第一保護膜11()自第一滾軸41〇 捲收拉出並壓貼於基底膜100。第二捲收滾軸320可將第 二保護膜120自第二滚軸420捲收拉出並壓貼於基底膜 100。第三捲收滾軸330可將第三保護膜130自第三滾軸 430捲收拉出並壓貼於第一保護膜ho。偏光膜最終 則捲收於偏光膜捲收滾軸340。 進一步說明本發明之偏光膜製造方法之實施步驟。如 圖2所示，步驟3001包含如圖1所示以第一張力21〇拉 伸第一保護膜110。在較佳實施例中，第一保護膜 係為三醋酸纖維，第一保護膜11()係捲收於第一滾軸41〇 上，第一張力210係由第一捲收滾軸310捲收第一保護 9 200928421 膜110時產生。然而在不同實施例中，可以其他方式拉 伸第一保護膜110以產生第一張力210。 如圖2所示，步驟3〇〇3包含如圖1所示以第二張力 220拉伸第二保護膜12〇。在較佳實施例中，第二保護膜 係為聚環烯烴高分子，第二保護膜12〇係捲收於第二滾 軸420上，第二張力220係由第二捲收滾軸320捲收第 一保濩膜時產生。然而在不同實施例中，可以其他 方式拉伸第二保護膜120以產生第二張力220。 如圖2所示，步驟3〇〇5包含如圖1所示，在基底膜 100、纟二過於第一槽體51〇中進行之染色步驟、在第二槽體 520中進行之固色與拉伸步驟、以及在乾燥裝置中進 行之乾燥步驟後，將第一保護膜11〇及第二保護膜12〇 分別貼合於基底膜丨〇〇二側。其中，基底膜100之單體 穿透率係大於41%、偏光度係高於99.⑽，厚度係介於 〇 至35#m。在較佳實施例中，基底膜1〇〇係為聚乙烯醇， 基底膜100係捲收於基底膜滾轴4〇〇上。 如圖2所示，步驟3007包含如圖1所示以第三張力 拉伸第二保護膜130。在較佳實施例中，第三保護膜 係為聚對苯二甲酸乙二_，第三倾膜130係捲收於 第三滾轴430上，第三張力23〇係由第三捲收滾軸33〇 捲收第三保護膜130時產生。然而在不同實施例中，可 乂其他方式拉伸第三保護膜130以產生第三張力230。 如圖2所示，步驟3009包含如圖1所示將第三保護 200928421 膜130貼合於第一保護膜no相對於基底膜1〇〇之另侧， 以形成複合膜141。 如圖2所示，步驟3011包含如圖1所示以第四張力 240拉伸複合膜141以形成偏光膜14〇。在較佳實施例 中’第四張力240係由偏光膜捲收滾轴340捲收複合膜 141時產生。然而在不同實施例中，可以其他方式拉伸複 合膜141以產生第四張力240。 〇 其中，自步驟3001至步驟3011中之第一張力21〇與 第三張力230之乘積除以第二張力220與第四張力24〇 之乘積之比值係介於〇. 015至8之間。意即， (第一張力210)\(第三^^)— (第二張力220) x(第四張力240) ~ ”， 0.015 $ w幺8 此外，在較佳實施例中，貼合步驟包含使用聚乙烯醇高 为子或聚氨基甲酸乙酯（P〇lyurethane )作為貼合劑。 然而在不同實施例中，亦可使用其他水性黏膠作為貼合 之用。 本發明之偏光膜製造方法進一步包含在如圖丨所示之 基底膜100與第一保護臈110及第二保護膜120貼合前， 對基底臈1GG進行預處理。在較佳實施例巾，預處理步 驟包含在溫度介於251至35°C的水中進行膨潤，以及 在溫度介於25°C至50¾的含有重量百分率3· 〇至5. 5之 硼以及重里百分率2. q至& 〇之捵化卸之溶液中，拉 200928421 伸使基底膜100之長度成為原本長度之4至7倍。 本發明之偏細製造方法進—步包含在如^所示之 基底膜100與第-保護膜110及第二保護膜12〇貼合前， 對第-保麵11G進行皂化處理。偏細製造方法進〆 步包含在基底膜100與第一保護膜11〇及第二保護膜12〇 貼合前’對第二保護膜12G進行表面改f。偏光膜製造 方法進一步包含對第一保護膜110進行霧面處理 (anti-glare treatment)。偏光膜製造方法進一步包含 對第-保護膜110進行高精細霧面處理（high純肪 anti-glare treatment)。偏光膜製造方法進一步包含對 第一保護膜no進行硬鍍膜處理（hardc〇ating treatment)。以下舉例說明上述偏光膜製造方法及各步 驟。 實施例1 在如圖1中之第二槽體520中，將單體穿透率大於 41%、偏光度高於99. 9%，厚度介於20至35_之聚乙歸 醇基底膜100在溫度介於25°CS35t的水中進行膨潤， 以及在溫度介於25¾至50t：的含有重量百分率3·〇至 5. 5之硼酸以及重量百分率2. 〇至6. 〇之碘化鉀之溶液 中’拉伸使基底膜1〇〇之長度成為原本長度之4至7倍。 而後如圖1所示，使用聚乙烯醇高分子水膠將以7〇公斤 之第一張力210拉伸之第一保護膜11〇及以3〇公斤之第 二張力220拉伸之第二保護膜120分別貼合於基底膜1〇〇 12 200928421 二侧。其中，第一保護膜110係為經過皂化處理之三醋 酉夂纖維帛一保護膜120係為經過電暈處理以增加表面 親水f生之t環稀高分子。接著將以37公斤之第三張力 230拉伸之第三保護膜13〇貼合於第-保護膜110相對於 基底膜100之另側，以形成複合膜141。其中，第三保護 膜130係為1對苯一甲酸乙二醇醋。最後’以65公斤之 第四張力240拉伸複合膜hi以形成偏光膜14〇。 如圖3所示，本發明之偏光膜14〇包含基底膜1〇〇、 第一保護膜11〇、第二保護膜12〇以及第三保護膜13〇。 其中，第一保護膜係經第一張力210拉伸後貼合於基底 膜100之一側。第二保護12〇膜係經第二張力22〇拉伸 後貼合於基底膜1〇〇相對於第一保護膜11〇之另侧。第 三保護膜130係經第三張力230拉伸後貼合於第一保護 膜110相對於基底膜1〇〇之另侧。偏光膜14〇係經第四 張力240拉伸，且第一張力210與第三張力230之乘積 除以第二張力220與第四張力240之乘積之比值係介於 0. 015至8之間。在此實施例中， (第一張力210)x(第三張力230) _ 70公斤χ37公斤 ^二張力 220)x(第四張力 = 實施例2 在如圖1中之第二槽體520中，將單體穿透率大於 41%、偏光度高於99. 9%，厚度介於20至35//m之聚乙稀 醇基底膜100在溫度介於25°C至35°C的水中進行膨、潤， 13 200928421 以及在溫度介於25。(：至50t的含有重量百分率3 〇至 5. 5之徽以及重量百分率U至6. 0之碟化鉀之溶液 中，拉伸使基顧100之長度成為原本長度之4至7倍。 而後如圖1戶斤示’使用聚乙烯醇高分子水膠將以8〇公斤 之第一張力210拉伸之第一保護臈11〇及以7〇公斤之第 二張力220拉伸之第二保護膜12〇分別貼合於基底膜謂 二側。其中，第一保護膜H0係為經過皂化處理之三醋 酸纖維’第二保護膜120係為經過電暈處理以增加表面 親水性之聚環稀煙面分子。接著將以邪公斤之第三張力 230拉伸之第三保護膜13〇貼合於第一保護膜11〇相對於 基底膜100之另側，以形成複合膜141。其中，第三保護 膜130係為聚對苯二曱酸乙二醇酯。最後，以4〇公斤之 第四張力240拉伸複合膜141以形成偏光膜140。其中， 一張力210)x(第三張力230) 80公斤X35公斤 (第二張力 220) X (第四張力 240)= = 1.00 本發明已由上述相關實施例加以描述’然而上述實施 例僅為實施本發明之範例。必需指出的是，已揭露之實 施例並未限制本發明之範圍。相反地，包含於申請專利 範圍之精神及範圍之修改及均等設置均包含於本發明之 範圍内。 【圖式簡單說明】 圖1為本發明之偏光膜製造方法之較佳實施例示意圖； 200928421 圖2為本發明之偏光膜製造方法之較佳實施例流程圖； 圖3為本發明之偏光膜之較佳實施例示意圖； 【主要元件符號說明】 100基底膜 110第一保護膜 120第二保護膜 ❹ 130第三保護膜 140偏光膜 141複合膜 210第一張力 220第二張力 230第三張力 240第四張力 310第一捲收滾軸 ® 320第二捲收滾軸 330第三捲收滾軸 340偏光膜捲收滾軸 400基底膜滾軸 410第一滾軸 420第二滾軸 430第三滾軸 510第一槽體 15 200928421 520第二槽體 530乾燥裝置 3001步驟 3003步驟 3005步驟 3007步驟 3009步驟 ❹ 3011步驟200928421 IX. Description of the Invention: [Technical Field] The present invention relates to a method for producing a polarizing film; in particular, the present invention relates to a method for manufacturing a polarizing film for use in a liquid crystal display (LCD) . [Prior Art] The quality of the polarizing film is one of the important factors that affect the display effect of the liquid crystal display including contrast, view angle, color saturation, dark state, and color shift. The preferred quality of the polarizing film can enhance the display effect of the liquid crystal display. The manufacturing method of the conventional polarizing film comprises: after the step of dyeing, fixing, stretching and drying the polyvinyl alcohol (PVA), the protective layer of the triacetate (TAC) and the poly The cycloolefin polymer (C0P) protective layer is adhered to both sides, and the surface protective film and the release film are respectively attached to one side of the triacetate protective layer and one side of the polycycloolefin polymer protective layer. That is to complete. Since the polarizing film is formed by bonding optical films of different materials, the effect of bonding the optical films of different materials directly affects the quality of the polarizing film, thereby affecting the display effect of the liquid crystal display. One of the evaluation indexes of the optical film bonding effect is the occurrence and degree of warpage of the polarizing film. If there is a lot of warpage or a large degree of warpage, it is easy to use the polarizing film for film sticking. Therefore, when the optical film is bonded, the state in which the polarizing film is warped is small or the degree of warpage is small, and the quality of the polarizing film is preferable. SUMMARY OF THE INVENTION A primary object of the present invention is to provide a method for producing a polarizing film for reducing the occurrence of warpage of a polarizing film.另一 Another main object of the present invention is to provide a polarizing film which has less warpage. The method for manufacturing a polarizing film of the present invention comprises: stretching the first protective film by a first tension; stretching the second protective film by a second tension; and bonding the first protective film and the second protective film to the two sides of the base film Stretching the second protective film at a third tension; bonding the third protective film to the other side of the first protective film relative to the base film to form a composite film; and stretching the reticular film at a fourth tension to form Polarized film. Wherein the ratio of the product of the first tension to the third tension divided by the product of the second tension and the fourth tension is between 015. 015 and 8. The stretching step involves the use of a roller reel. The first protective film is triacetate fiber. The second protective film is a polycycloolefin polymer. The basement membrane is polyethylene glycol, wherein the basement membrane has a monomer permeability greater than Μ%, a degree of polarization greater than 99.9%, and a thickness system ranging from 2〇 to 35_. The third protective film is polyethylene terephthalate. The method for producing a polarizing film further includes subjecting the base film to the base film before the first protective film 200928421 and the second protective film. The pretreatment step is included in the temperature range from pit to 35. (3) Infuriating _, and at temperatures between 25 ° C and 5 (). (10) The amount of the base film is 4 to 7 times the length of the original film, which contains 4 parts of fresh, 3. G to 5. 5 and «% 2. 〇 to 6 · Q. The method for producing a polarizing film further includes subjecting the first protective film to a chemical treatment before bonding the base film to the first protective film and the second protective film. The polarizing film manufacturing method further comprises surface modifying the second protective film before the base film is bonded to the first protective film and the second protective film. The bonding step involves using a polyvinyl alcohol polymer as a binding agent. The laminating step comprises using a polyamino hydrazine (pQlyureth) as a binding agent. The fine-grained yarn-in-pure treatment is carried out by anti-glare treatment. The polarizing film manufacturing method further includes performing a high-grain anti-glare treatment on the first protective film. The method for producing a polarizing film further includes performing a hard coating treatment on the first protective film. The polarizing film of the present invention comprises a base film, a first protective film, a second protective film, and a third protective film. The first protective film is stretched by the first tension and bonded to one side of the base film. The second protective lanthanum is stretched by the second tension and attached to the other side of the base film relative to the first protective film. The third protective film is stretched by the third tension and bonded to the other side of the first protective film relative to the base film. The polarizing film is stretched by the fourth tension, and the ratio of the product of the first tension to the second tension is divided by the product of the second tension and the fourth tension is between 0.015 and 8. [Embodiment] The present invention provides a method for producing a polarizing film, and a polarizing film produced by using the method for producing a polarizing film. 1 and 2 are flow charts showing an embodiment and a method of manufacturing a polarizing film according to an embodiment of the present invention. As shown in FIG. 1, in the preferred embodiment, the roller 400, the first roller 410, the second roller 420, and the third roller 430 respectively wind up the base film 100, the first protective film 110, and the second The protective film 120 and the second protective film 130. The first tank body 51 is a dyeing tank. The second tank 520 is a fixing groove. The drying device 53 is used for drying the film. The first take-up reel 310 can take up and pull the first protective film 11() from the first roller 41(R) and press it against the base film 100. The second take-up reel 320 can take up the second protective film 120 from the second roller 420 and press it against the base film 100. The third take-up reel 330 can take up the third protective film 130 from the third roller 430 and press it against the first protective film ho. The polarizing film is finally wound up on the polarizing film take-up reel 340. The implementation steps of the method for producing a polarizing film of the present invention will be further described. As shown in FIG. 2, step 3001 includes drawing the first protective film 110 at a first tension 21A as shown in FIG. In a preferred embodiment, the first protective film is a triacetate fiber, the first protective film 11 () is wound around the first roller 41, and the first tension 210 is rolled by the first take-up reel 310. The first protection 9 200928421 film 110 is produced. However, in various embodiments, the first protective film 110 can be stretched in other manners to create a first tension 210. As shown in Fig. 2, step 3〇〇3 includes stretching the second protective film 12〇 with a second tension 220 as shown in FIG. In a preferred embodiment, the second protective film is a polycycloolefin polymer, the second protective film 12 is wound around the second roller 420, and the second tension 220 is rolled by the second take-up reel 320. Produced when the first film is received. However, in various embodiments, the second protective film 120 can be stretched in other manners to produce a second tension 220. As shown in FIG. 2, step 3〇〇5 includes a dyeing step performed in the base film 100, the second pass through the first groove 51〇, and a fixing in the second groove 520, as shown in FIG. After the stretching step and the drying step performed in the drying device, the first protective film 11A and the second protective film 12A are respectively bonded to the base film side. The base film 100 has a monomer transmittance of more than 41%, a polarization degree of more than 99. (10), and a thickness of from 〇 to 35#m. In a preferred embodiment, the base film 1 is made of polyvinyl alcohol, and the base film 100 is wound around the base film roll 4〇〇. As shown in Fig. 2, step 3007 includes stretching the second protective film 130 at a third tension as shown in FIG. In a preferred embodiment, the third protective film is polyethylene terephthalate, the third inclined film 130 is wound on the third roller 430, and the third tension 23 is rolled by the third roll. The shaft 33 is produced when the third protective film 130 is wound up. However, in various embodiments, the third protective film 130 can be stretched in other manners to create a third tension 230. As shown in FIG. 2, step 3009 includes attaching a third protective 200928421 film 130 to the other side of the first protective film no with respect to the base film 1 to form a composite film 141 as shown in FIG. As shown in Fig. 2, step 3011 includes stretching the composite film 141 at a fourth tension 240 as shown in Fig. 1 to form a polarizing film 14A. In the preferred embodiment, the fourth tension 240 is generated when the composite film 141 is taken up by the polarizing film take-up reel 340. However, in various embodiments, the composite film 141 can be stretched in other manners to produce a fourth tension 240. The ratio of the product of the first tension 21 〇 and the third tension 230 in steps 3001 to 3011 divided by the product of the second tension 220 and the fourth tension 24 系 is between 015. 015 and 8. That is, (first tension 210)\(third ^^) - (second tension 220) x (fourth tension 240) ~", 0.015 $w幺8 In addition, in the preferred embodiment, the fitting step The method comprises the use of a polyvinyl alcohol or a polyurethane as a bonding agent. However, in different embodiments, other aqueous adhesives may also be used as a bonding. The polarizing film manufacturing method of the present invention Further, the substrate 臈 1GG is pretreated before the base film 100 is bonded to the first protective 臈 110 and the second protective film 120 as shown in FIG. 在. In the preferred embodiment, the pretreatment step is included in the temperature. Swelling in water at 251 to 35 ° C, and a solution containing a weight percentage of 3 · 〇 to 5.5 5% and a percentage by weight of the mixture at a temperature of from 25 ° C to 503⁄4 2. q to &; In the middle, pull 200928421 stretches the length of the base film 100 to 4 to 7 times the original length. The partial manufacturing method of the present invention further includes the base film 100 and the first protective film 110 and the second protection as shown in Before the film 12 is bonded, the first surface is saponified. The fine manufacturing method is introduced. The step of performing surface modification of the second protective film 12G before the base film 100 is bonded to the first protective film 11 and the second protective film 12A. The polarizing film manufacturing method further includes matting the first protective film 110. The anti-glare treatment method further includes a high-definition anti-glare treatment on the first protective film 110. The polarizing film manufacturing method further includes hardening the first protective film no The method of manufacturing the polarizing film and the respective steps are exemplified below. Embodiment 1 In the second tank 520 of FIG. 1, the monomer transmittance is greater than 41% and the polarization is high. 99.9% of the polyethylidene base film 100 having a thickness of 20 to 35 Å is swelled in water at a temperature of 25 ° C 35 t, and at a temperature of 253⁄4 to 50 t: 5. 5 boric acid and weight percentage 2. 〇 to 6. 〇 in the solution of potassium iodide 'stretching makes the length of the base film 1 成为 4 to 7 times the original length. Then, as shown in Figure 1, the use of polyethylene Alcohol polymer water gel will be 7 〇 kg The first protective film 11 拉伸 stretched by the first tension 210 and the second protective film 120 stretched by the second tension 220 of 3 〇 kg are respectively attached to the base film 1 〇〇 12 200928421 on both sides. The protective film 110 is a saponified triacetin fiber 帛-protective film 120 is a t-ring dilute polymer which has been corona treated to increase the surface hydrophilicity, and then is stretched by a third tension 230 of 37 kg. The third protective film 13 is adhered to the other side of the first protective film 110 with respect to the base film 100 to form a composite film 141. The third protective film 130 is a pair of p-benzoic acid glycol vinegar. Finally, the composite film hi was stretched at a fourth tension 240 of 65 kg to form a polarizing film 14?. As shown in FIG. 3, the polarizing film 14A of the present invention comprises a base film 1A, a first protective film 11A, a second protective film 12A, and a third protective film 13A. The first protective film is stretched by the first tension 210 and bonded to one side of the base film 100. The second protective 12-inch film is stretched by the second tension 22, and bonded to the other side of the base film 1〇〇 with respect to the first protective film 11〇. The third protective film 130 is stretched by the third tension 230 and bonded to the other side of the first protective film 110 with respect to the base film 1 . The ratio of the product of the first tension 210 and the third tension 230 divided by the product of the second tension 220 and the fourth tension 240 is between 0.015 and 8 . In this embodiment, (first tension 210) x (third tension 230) _ 70 kg χ 37 kg ^ two tension 220) x (fourth tension = embodiment 2 in the second tank 520 as in Fig. 1 a polyethylene glycol base film 100 having a monomer permeability of more than 41% and a degree of polarization higher than 99.9% and a thickness of 20 to 35/m in water at a temperature of 25 ° C to 35 ° C Extrusion, run, 13 200928421 and in the solution at a temperature of 25 (... to 50t containing a weight percentage of 3 〇 to 6.5 and a weight percentage of U to 6.0. The length of the Gu 100 is 4 to 7 times the original length. Then, as shown in Figure 1, the first protection 臈 11〇 stretched with a first tension 210 of 8 〇 kg using a polyvinyl alcohol polymer water gel The second protective film 12〇 stretched by the second tension 220 of 7 kilograms is respectively attached to the base film, and the first protective film H0 is a saponified triacetate fiber 'second protective film 120 series. a polycyclic smoky surface molecule which has been subjected to corona treatment to increase the hydrophilicity of the surface. Then, a third protective film 13 拉伸 stretched by the third tension 230 of the evil kilogram is attached to the first The protective film 11 is opposite to the other side of the base film 100 to form a composite film 141. The third protective film 130 is polyethylene terephthalate. Finally, the fourth tension 240 is 4 〇. The composite film 141 is stretched to form a polarizing film 140. wherein, a tension 210)x (third tension 230) 80 kg X35 kg (second tension 220) X (fourth tension 240) == 1.00 The present invention has been related to the above The embodiments are described herein. However, the above-described embodiments are merely examples for implementing the invention. It is to be understood that the disclosed embodiments are not intended to limit the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a preferred embodiment of a method for producing a polarizing film of the present invention; 200928421 FIG. 2 is a preferred embodiment of a method for producing a polarizing film of the present invention. 3 is a schematic view of a preferred embodiment of a polarizing film of the present invention; [Description of main components] 100 base film 110 first protective film 120 second protective film ❹ 130 third protective film 140 polarizing film 141 composite film 210 first tension 220 second tension 230 third tension 240 fourth tension 310 first retracting roller® 320 second reeling roller 330 third reeling reel 340 polarizing film reeling roller 400 base film roller 410 first roller 420 second roller 430 third roller 510 first slot body 15 200928421 520 second slot body 530 drying device 3001 step 3003 step 3005 step 3007 step 3009 step ❹ step 3011
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