201131222 六、發明說明： 【發明所屬之技術領域】 本發明係關於再利用導光板之製造過程中所產生之邊料 專’製造向品質導光板之方法。 【先前技術】 作為液晶顯示裝置或照明裝置等之背光源，例如眾所周 知以如下方式而構成者：於導光板之側方配置冷陰極燈， 利用形成於導光板背面之圓點圖案或稜柱部等，使來自該 冷陰極燈之光反射，可從導光板前面均一地出射光。作為 如此背光源用導光板，眾所周知為使用丙烯酸系樹脂等而 成形之導光板（參照日本特開2001_76522號公報（專利文獻 1))。 作為構成上述導光板之樹脂，由於有必要使從導光板側 方入射之光有效率地擴大至面内，因此謀求透明性優良， 因此作為構成導光板之樹脂，通常使用未使用之透明樹 脂。 【發明内容】 又，於製造導光板之過程中產生邊料，但在製造謀 明性優良之導光板時無法將前述邊料保制狀混合於未使 用之樹脂進行再利用’因此先前在導光板之製造過程中所 產生之邊料作為廢棄物處理。 但，不利用上述邊料之處理較為不經濟，另，— 社會強烈要求之資源之有效利用之觀點而言較為不佳。 本發明係鑑於上述技術性背景而完成者，其目的係提供 151568.doc 201131222 一種將導光板之製造過程中所產生之邊料等導光板廢材再 利用而製造高品質導光板之方法。 為達成前述目的’本發明提供以下方法。 π] —種導光板之製造方法，其包含： 清洗透明樹脂製導光板之廢材之清洗步驟； 將經清洗之前述廢材粉碎而獲得廢材粉碎物之粉碎步 驟； 混合未使用之透明樹脂與前述廢材粉碎物而獲得混合物 之混合步驟；及 使前述混合物成形為板狀而獲得導光板之成形步驟。 [2]如則項[1 ]之方法，其中作為俞成疏4 Τ忭马别迷廢材，使用前述清洗 前300 mm之光路長中測定之幻為5 〇以下之廢材。 [3]如前項⑴或[2]之方法，其中前述混合物中廢材粉碎物 之含有比率為3〜40質量％。 其係以純水或去離子水 [4]如前項[1]〜[3]中任一項之方法 進行前述廢材之清洗。 :别項⑴〜[4]中任—項之方法其+作為前述廢材， 用導光板之製造過程中產生之邊料。 ⑴之發明中，由於具備清洗導光板之製造過程中所 生：邊料等廢材之清洗步驟’因此可製造黃色度η小且: 備:透射率之導光板。因為可再利用如此導光板之 程中所產生之邊料等廢材’製造新的導光板，故可不；; 地使用導光板之製造所準備之原料，較為瘦濟不浪， 應資源之有制収社會要纟。且亦可f: 15} 568.doc 201131222 [2] 之發明中，作為廢材，使用清洗前3〇〇 之光路長 t測定之扒為5.〇以下之廢材，因此可製造光之吸收更少 之導光板，即透明性更高之導光板。 [3] 之發明中，由於混合物中廢材粉碎物之含有比率為 3〜40質量％，因此可製造透明性更高之導光板。 [4] 之發明中，由於以純水或去離子水進行廢材之清 洗，因此作為成形所使用之混合物可供給201131222 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a method of manufacturing a quality light guide plate by using a side material produced in a process of manufacturing a light guide plate. [Prior Art] As a backlight of a liquid crystal display device or an illumination device, for example, it is known that a cold cathode lamp is disposed on the side of the light guide plate, and a dot pattern or a prism portion formed on the back surface of the light guide plate is used. The light from the cold cathode lamp is reflected, and the light can be uniformly emitted from the front of the light guide plate. As a light guide plate for a backlight, a light guide plate formed by using an acrylic resin or the like is known (refer to Japanese Laid-Open Patent Publication No. 2001-76522 (Patent Document 1)). In the resin constituting the light guide plate, since it is necessary to efficiently expand the light incident from the side of the light guide plate into the surface, the transparency is excellent. Therefore, as the resin constituting the light guide plate, an unused transparent resin is usually used. SUMMARY OF THE INVENTION Further, in the process of manufacturing a light guide plate, a side material is produced. However, when manufacturing a light guide plate having excellent visibility, the above-mentioned edge material protection form cannot be mixed with an unused resin for reuse. The edge material produced during the manufacturing process of the light board is treated as waste. However, it is not economical to use the above-mentioned marginal materials, and it is not preferable from the viewpoint of effective use of resources strongly requested by society. The present invention has been made in view of the above technical background, and an object thereof is to provide a method for manufacturing a high-quality light guide plate by reusing a light guide plate waste material such as a side material produced in a manufacturing process of a light guide plate by 151568.doc 201131222. In order to achieve the aforementioned object, the present invention provides the following method. π] - a method of manufacturing a light guide plate, comprising: a cleaning step of cleaning a waste material of a transparent resin light guide plate; pulverizing the washed waste material to obtain a pulverization step of the waste material pulverized material; mixing unused transparent resin a mixing step of obtaining a mixture with the above-mentioned waste material pulverized material; and a forming step of obtaining the light guide plate by forming the foregoing mixture into a plate shape. [2] The method of the item [1], wherein the Yu Cheng Shu 4 Τ忭 别 别 别 废 , , , , , , , , , , 俞 俞 俞 俞 俞 俞 俞 俞 俞 俞 俞 俞 俞 俞 俞 俞 俞 俞 俞 俞 俞 俞 俞 俞 俞[3] The method according to the above (1) or [2] wherein the content of the pulverized material of the waste material in the mixture is from 3 to 40% by mass. The above-mentioned waste material is cleaned by the method of any one of the above [1] to [3]. : The method of any one of (1) to [4], wherein the + is used as the waste material, and the edge material produced in the manufacturing process of the light guide plate is used. In the invention of (1), since the cleaning step of the waste material such as the edge material is produced in the manufacturing process of cleaning the light guide plate, it is possible to manufacture a light guide plate having a small yellowness η and a transmittance. Because the waste material such as the edge material generated in the process of the light guide plate can be reused to manufacture a new light guide plate, the raw materials prepared by using the light guide plate can be used in a relatively small amount, and the resources should be It is necessary to collect the society. Moreover, in the invention of f: 15} 568.doc 201131222 [2], as the waste material, the waste material measured by the light path length t before washing is used as a waste material of 5. 〇 or less, so that absorption of light can be produced. Less light guides, that is, light guides with higher transparency. In the invention of the third aspect, since the content ratio of the pulverized material of the waste material in the mixture is from 3 to 40% by mass, a light guide plate having higher transparency can be produced. In the invention of [4], since the waste material is washed with pure water or deionized water, the mixture used as the molding can be supplied.
製造透明性更高之導光板。 TProduce a light guide plate with higher transparency. T
[5] 之發明中’作為廢材，使用導光板之製造過程中產 生之邊料，因此可製造透明性更高之導光板。 【實施方式】 針對本發明之導光板1之製造方法進行說明。本製造方 法至少具備清洗步驟、粉碎步驟、混合步驟、成形步驟。 以下依次說明每個步驟。 [清洗步驟] 該清洗步驟中，清洗透明樹脂製導光板之廢材。該透明 樹脂製導光板之尺寸通常為150 mmx200 _以上，例如 1500 mmx2_mm以下。該導光板之表面可為平坦面，亦 可設置有例如棱柱形狀、浮雕形狀、柱狀透鏡、菲淫爾透 鏡等凹&形狀。導光板兩面可為平坦面，可一面為平坦面 而另-面設有凹凸形狀，亦可兩面都設有凹凸形狀。兩面 設有凹凸形狀時，可兩面設有相同之凹凸形狀，亦可設有 各不，同之凹凸形狀。藉由清洗如此之導光板之廢材，可 製造高透明性之導光板。 151568.doc 201131222 作為導光板之前述廢材’無特別限制，你丨t 例如可舉出導光 板之製造過程中所產生之邊料（邊材）、製造線起動時產生 之邊料、結束使用而廢棄之導光板等。廢材係製造過程中 所產生之邊料或起動時產生之邊料時，該廢材之尺寸通常 為 50 mm><200 mm以上。 作為前述廢材，使用於300 mm之光路長中測定之(巧 色度）為5.0以下之廢材較佳。此時，可製造光吸收更少之 導光板，即透明性更高之導光板i。#中作為前述廢^， 使用於300 mm之光路長中測定之YI(黃色度）為4 〇以下之 廢材更佳。 前述清洗以純水或去離子水（離子交換水） 此以純水或去離子水進行時，可供給更高純)=二 所使用之材料，因此可製造透明性更高之導光板i。 作為前述清洗方法，無特別限制，例如可舉出浸潰法、 喷射法等。另，前述清洗例如可以批量式進行，亦可以連 續式進行。 作為前述導光板，除包含未添加有微粒子（微粒子無添 加）之透明樹脂之樹脂板外，可例示於透明樹脂中分散有 光擴散粒子而成之樹脂組合物之板狀體等。又，於前述廢 材中貼著有保護膜時，於清洗步驟即將開始前將該保護膜 剥離較佳。如此於清洗步驟即將開始前剝離，從而可防止 塵埃、粉塵等之附著。 作為前述透明樹脂，例如可舉出曱基丙烯酸酯樹脂 (PMMA等）、聚碳酸酯樹脂、ABS樹脂（丙烯腈-苯乙烯-丁 151568.doc 201131222 二烯共聚物樹脂）、MS樹脂（曱基丙烯酸甲酯·苯乙烯共聚 物樹脂）、聚苯乙烯樹脂、AS樹脂（丙烯腈_苯乙烯共聚物 樹脂）、聚烯烴樹脂（聚乙烯、聚丙烯等）、環狀聚烯^等。 作為前述光擴散粒子，若係折射率與前述“樹脂不同 之微粒子，可擴散透射光者則無特別限制，可使用任一 者。例如可舉出玻璃珠、二氧化石夕粒子、氫氧化銘粒子、 碳酸約粒子、硫酸鋇粒子、氧化鈦粒子、滑石等無機粒 子，或苯乙烯系聚合物粒子、丙稀酸系聚合物粒子' 石夕氧 烧系聚合物粒子等樹脂粒子等。 [乾燥步驟] 必要時使前述經清洗之廢材加熱乾燥。作為前述乾㈣ 法，無特別㈣，但可舉出空氣刀法（強烈喷出空氣之、方 法)等。前述空氣刀法’喷出經以過遽器除去粉塵等之* 錢佳。加熱溫度設為赋〜赋較佳。該利用加: 燥步驟亦可不設置。 乾 [粉碎步驟] 粉碎前述廢材而獲得廢材粉碎物。作為該粉碎方法 ::限制，例如可舉出使超硬旋轉刀旋轉而粉碎之旋轉： 切碎機粉碎法、鐘式粉碎法、雙滾筒式粉碎法、;: 用超兩速旋轉葉輪之旋風式粉碎法等。 使 利用前述粉碎獲得平均粒徑為〇5 _〜1〇 _ 碎物較佳。若為如此大小則接近一般樹脂顆粒之大小，叔 :易地將未使用之透明樹脂顆粒與該廢材粉碎物： 、中利用前述粉碎獲得平均粒徑為！咖〜6 _之廢^ I51568.doc 201131222 粉碎物更佳。 [混合步驟] 將未使用之透明樹脂與前述廢材粉碎物混合而獲得混合 物。作為未使用之透明樹脂，使用與構成前述廢材粉碎物 之透明樹脂同種之樹脂較佳。例如構成廢材粉碎物之透明 樹脂為PMMA時，作為前述透明樹脂使用pmMa較佳。本 發明中，所謂「未使用之透明樹脂」，係未使用於製造導 光板或其他成形品（除顆粒外）之透明樹脂。 作為前述未使用之透明樹脂，例如可舉出甲基丙烯酸酯 樹脂（PMMA等）、聚碳酸酯樹脂、ABS樹脂（丙烯腈苯乙 烯-丁二烯共聚物樹脂）、MS樹脂（甲基丙烯酸甲酯-苯乙烯 共聚物樹脂）、聚苯乙烯樹脂、AS樹脂（丙烯腈_苯乙烯共 聚物樹脂）、聚烯烴樹脂（聚乙烯、聚丙烯等）、環狀聚烯炉 等。 二 作為前述未使用之透明樹脂，使用樹脂顆粒之形狀者較 佳，該樹脂顆粒之平均粒徑為〇 5 mm〜1〇 mm較佳。若為 士此大小，則可更均一地混合未使用之透明樹脂與廢材粉 碎物》 * ^述混合物中廢材粉碎物之含有比率設定為3質量 質置較佳。為3質量％以上從而可增大廢材粉碎物之使用 比率，可提高導光板廢材之再使用效率，且為4〇質量％以 而可製故透明性更高之導光板。其中，前述混合物中廢 材^知物之含有比率設定為5質量％〜3〇質量％更佳。 可不於前述混合物中添加光擴散粒子等微粒子，亦可添 151568.doc 201131222 力二擴：粒子等微粒子。將前述微粒子添加 中時，則述廢材包含光擔散粒子等微粒子時， 前述混合物中之微粒子，可使 〜; 子同種者。 了使用與前述廢材所包含之微粒 /，亦可於前述混合物中添加例如紫外線吸收劑、执稃 疋劑、抗氧化劑、而十候劑、光穩定劑、螢光增白劑、加: 穩定劑等各種添加劑。 [成形步驟] 使前述混合物成形為板狀而獲得導光板i(參照叫。作 =此時之成形方法，可使用作為樹脂板之成形方法而幕所 周知之成形方法，無特別限制，例如可舉出溶融擠出法、 =壓法〜射出成形法等。前料光板k厚度無特別限 1 ’通常設定為0.05 mm〜15mm，較佳為〇」咖〜1〇咖， 更佳為0.5 mm〜5 mm。成形步驟中所得之導光板丨之尺寸 通常為150 mmx200 mm以上，15〇〇 _2〇〇〇随以下。導 光板k表面可為平坦面’亦可設有例如棱柱形狀、浮雕 形狀、柱狀透鏡、菲淫爾透鏡等凹凸形狀。導光板丄之兩 面可為平坦面’可一面為平坦面而另—面設有凹凸形狀， 亦可兩面都設有凹凸形狀。導光板i之兩面設有凹凸形狀 時’可兩面設有相同之凹凸形狀’亦可設有各不相同之凹 凸形狀。 本發明之導光板丨之製造方法不特別限於上述實施形 態，若在請求範圍内，則係在不脫離其精神之範圍内亦容 許設計上變更者。 151568.doc 201131222 實施例 接著’針對本發明之具體實施例進行說明，本發明不特 別限於該等實施例。 <實施例1> 以螺桿徑40 mm之單軸擠出機，將PMMA(聚甲基丙烯酸 甲酯）（住友化學股份有限公司製[SUMIPEX EXN]、折射 率·· 1.49)熔融混煉，以樹脂溫度255<>(：從7模具擠出，藉 此製成厚度4 mm、寬度250 mm、長度8〇〇 mm之兩面為平 坦面之導光板。回收將該導光板裁切成2〇〇 mmx3〇〇爪爪大 小時產生之邊料（廢材）。關於前述邊料，3〇〇出爪光路長下 測定之YI為1.8，可視光之平均光線透射率為队州（測定 方法於後述）。 接著，藉由將前述邊料浸潰於純水中而進行清洗（清洗 步驟）。將前述經清洗之邊料以旋轉粉碎法粉碎而獲得平 均粒徑3.7 mm之邊料粉碎物（粉碎步驟）。 接著，將前述邊料粉碎物3〇質量份&PMMa顆粒（住友^ 學股份有限公司製[SUMIPEX ΕΧΝ]、折射率：149)⑽ 用之透明樹脂）70質量份以亨舍_拌機混合而獲得混/ 物（混合步驟）。X，前述PMMA顆粒大致為擴圓柱形狀， 橢囡形狀之平均短軸徑為2.5 mm，^圓形狀之平均長轴裡 為3.3 mm，橢圓柱之平均高度為 將前述混合物以螺桿徑4〇 _之單轴擠出機溶融混辣 後’於樹脂溫度⑽下從τ模具擠出，藉此而製成厚心 麵、寬度2〇〇mm、長度800 _之兩面為平坦面之導光板 151568.doc 201131222 (成形步驟）。 〈實施例2> 前述混合步驟中除以亨舍爾攪拌機混合前述邊料粉碎物 20質量份及PMMA顆粒（未使用之透明樹脂）8〇質量份而與 得混合物外，與實施例1相同地製造導光板。 〈實施例3> 前述混合步驟中除以亨舍爾攪拌機混合前述邊料粉碎物 1 〇質量份及PMMA顆粒（未使用之透明樹脂）9〇質量份而獲 得混合物外，與實施例1相同地製造導光板。 〈比較例1 > 除省略（不進行）邊料利用純水之清洗外，與實施例i相 同地製造導光板。 <比較例2> 除省略（不進行）邊料利用純水之清洗外，與實施例2相 同地製造導光板。 <參照例> 以螺桿徑40 mm之單軸擠出機，將pMMA顆粒（住友化學 股份有限公司製[SUMIPEX ΕχΝ]、折射率： 之透明樹脂）熔融混煉，於樹脂溫度255它 出’藉此製成厚度4 mm、宽唐20fl e :^49)(未使用[5] In the invention, as the waste material, the edge material produced in the manufacturing process of the light guide plate is used, so that a light guide plate having higher transparency can be manufactured. [Embodiment] A method of manufacturing the light guide plate 1 of the present invention will be described. The manufacturing method includes at least a washing step, a pulverizing step, a mixing step, and a forming step. Each step is explained in turn below. [Cleaning Step] In the cleaning step, the waste material of the transparent resin light guide plate is cleaned. The transparent resin light guide plate is usually 150 mm x 200 _ or more, for example, 1500 mm x 2 mm or less. The surface of the light guide plate may be a flat surface, and may be provided with a concave &le shape such as a prism shape, a relief shape, a lenticular lens, or a fluorescing lens. The light guide plate may have a flat surface on both sides, and may have a flat surface on one side and a concave-convex shape on the other surface, or may have a concave-convex shape on both sides. When the two sides are provided with a concavo-convex shape, the same concavo-convex shape may be provided on both sides, or each of them may be provided with the same concavo-convex shape. By cleaning the waste material of such a light guide plate, a highly transparent light guide plate can be manufactured. 151568.doc 201131222 As the aforementioned waste material of the light guide plate, there is no particular limitation. For example, you can see the edge material (sapwood material) produced during the manufacturing process of the light guide plate, the edge material generated during the start of the manufacturing line, and the end use. Discarded light guides, etc. When the waste material is produced in the manufacturing process or the edge material generated at the time of starting, the size of the waste material is usually 50 mm >< 200 mm or more. As the waste material, it is preferable to use a waste material having a light density of 5.0 or less measured at an optical path length of 300 mm. At this time, a light guide plate having less light absorption, that is, a light guide plate i having higher transparency can be manufactured. In the case of #废, it is better to use a waste material with a YI (yellowness) of 4 〇 or less measured in a length of 300 mm. When the above cleaning is carried out in pure water or deionized water (ion-exchanged water), when it is carried out in pure water or deionized water, it is possible to supply a material of higher purity = two, so that a light-transmitting plate i having higher transparency can be produced. The cleaning method is not particularly limited, and examples thereof include a dipping method and a spraying method. Further, the above washing may be carried out, for example, in a batch manner or in a continuous manner. In addition to the resin sheet containing the transparent resin to which the fine particles (the fine particles are not added), the plate member of the resin composition in which the light-diffusing particles are dispersed in the transparent resin can be exemplified. Further, when a protective film is adhered to the waste material, the protective film is preferably peeled off immediately before the start of the washing step. This is peeled off immediately before the cleaning step, so that adhesion of dust, dust, or the like can be prevented. Examples of the transparent resin include a mercapto acrylate resin (PMMA or the like), a polycarbonate resin, an ABS resin (acrylonitrile-styrene-butyl 151568.doc 201131222 diene copolymer resin), and an MS resin. Methyl acrylate/styrene copolymer resin), polystyrene resin, AS resin (acrylonitrile-styrene copolymer resin), polyolefin resin (polyethylene, polypropylene, etc.), cyclic polyene, and the like. The light-diffusing particles are not particularly limited as long as they have a refractive index different from that of the above-mentioned "resin." For example, glass beads, sulphur dioxide particles, and oxyhydroxide can be used. Inorganic particles such as particles, carbonic acid particles, barium sulfate particles, titanium oxide particles, and talc, or resin particles such as styrene polymer particles or acrylic acid polymer particles, such as cerium oxide polymer particles. Step] If necessary, the above-mentioned washed waste material is heated and dried. As the dry (four) method, there is no special (four), but an air knife method (method of strongly ejecting air), etc. may be mentioned. It is preferable to remove the dust or the like by a damper. The heating temperature is preferably set to a value of 5%. The use of the addition: the drying step may not be provided. Dry [Crushing step] The waste material is pulverized to obtain a pulverized material of waste material. The pulverization method: the limitation is, for example, a rotation in which the super-hard rotary blade is rotated and pulverized: a chopper pulverization method, a bell pulverization method, a double drum pulverization method, and a whirlwind powder using a super-two-speed rotary impeller The method of obtaining the average particle diameter by using the foregoing pulverization is preferably 〇5 _~1 〇 _ 碎 碎. If it is such a size, it is close to the size of the general resin granule, and the unclearly used unused transparent resin granules and the waste The pulverized material is obtained by using the above-mentioned pulverization to obtain an average particle diameter of ～ _ _ _ _ _ I51568.doc 201131222. The pulverized product is more preferable. [Mixing step] The unused transparent resin is mixed with the pulverized material of the foregoing waste material to obtain The resin which is the same as the transparent resin constituting the pulverized material of the waste material is preferably used as the transparent resin which is not used. For example, when the transparent resin constituting the pulverized material of the waste material is PMMA, pmMa is preferably used as the transparent resin. The "unused transparent resin" is a transparent resin that is not used in the manufacture of a light guide plate or other molded articles (other than particles). Examples of the transparent resin to be used include a methacrylate resin (PMMA or the like), a polycarbonate resin, an ABS resin (acrylonitrile styrene-butadiene copolymer resin), and an MS resin (methacrylic acid). An ester-styrene copolymer resin, a polystyrene resin, an AS resin (acrylonitrile-styrene copolymer resin), a polyolefin resin (polyethylene, polypropylene, etc.), a cyclic polyolefin furnace, or the like. Further, as the above-mentioned unused transparent resin, a shape of the resin pellet is preferably used, and the average particle diameter of the resin pellet is preferably 〇 5 mm to 1 mm. If it is of such a size, the unused transparent resin and the waste material pulverized material can be more uniformly mixed. * The content ratio of the pulverized material of the waste material in the mixture is set to 3 mass. When the ratio of use of the pulverized material of the waste material is increased by 3% by mass or more, the reuse efficiency of the waste material of the light guide plate can be improved, and the light guide plate having a higher transparency can be produced at a mass ratio of 4 Å by mass. The content ratio of the waste material in the mixture is preferably 5% by mass to 3% by mass. Microparticles such as light-diffusing particles may be added to the mixture, and microparticles such as particles may be added. When the fine particles are added, when the waste material contains fine particles such as light-supporting particles, the fine particles in the mixture may be the same species. The use of the microparticles contained in the waste material described above may also be added to the aforementioned mixture, for example, an ultraviolet absorber, an anti-oxidant, an antioxidant, a ten-time agent, a light stabilizer, a fluorescent whitening agent, and a stabilization: Various additives such as agents. [Molding step] The above-mentioned mixture is formed into a plate shape to obtain a light guide plate i (refer to the molding method at this time), and a molding method known as a molding method of a resin sheet can be used, and is not particularly limited, and for example, Examples of the melt extrusion method, the = pressure method, the injection molding method, etc. The thickness of the front material sheet k is not particularly limited to 1 'usually set to 0.05 mm to 15 mm, preferably 〇 咖 咖 〜 1 〇 ,, more preferably 0.5 mm ~5 mm. The size of the light guide plate 所得 obtained in the forming step is usually 150 mm x 200 mm or more, 15 〇〇 2 〇〇〇 with the following. The surface of the light guide plate k can be a flat surface ′, for example, a prism shape, a relief A concave-convex shape such as a shape, a lenticular lens, or a fluorescing lens. The two sides of the light guide plate 可 may be a flat surface ′, and may have a flat surface on one side and a concave-convex shape on the other surface, or may have a concave-convex shape on both sides. When the both surfaces are provided with the uneven shape, the same uneven shape may be provided on both sides. The uneven shape may be provided. The method for manufacturing the light guide plate of the present invention is not particularly limited to the above embodiment, and is within the scope of the request. Is in The design changer is also allowed to be excluded from the scope of the spirit. 151568.doc 201131222 Embodiments Next, the specific embodiments of the present invention will be described, and the present invention is not particularly limited to the embodiments. <Example 1> In a 40 mm single-axis extruder, PMMA (polymethyl methacrylate) (Sumitomo Chemical Co., Ltd. [SUMIPEX EXN], refractive index · 1.49) was melt-kneaded to a resin temperature of 255 <> (: Extrusion from 7 molds, thereby forming a light guide plate having a flat surface of 4 mm in thickness, 250 mm in width, and 8 mm in length, and recycling the light guide plate to a size of 2 mm x 3 〇〇 claws The edge material (waste material) produced. For the above-mentioned edge material, the YI measured by the light path length of the 3 claws is 1.8, and the average light transmittance of visible light is the team state (measurement method will be described later). The edge material is immersed in pure water for washing (cleaning step), and the washed side material is pulverized by a rotary pulverization method to obtain a pulverized material having an average particle diameter of 3.7 mm (pulverization step). Edge material pulverized material &PMMa granules (Sumitomo Chemical Co., Ltd. [SUMIPEX ΕΧΝ], refractive index: 149) (10) Transparent resin) 70 parts by mass was mixed with a Henscher-mixer to obtain a mixture (mixing step). X, The PMMA particles have a substantially cylindrical shape, the average minor axis diameter of the elliptical shape is 2.5 mm, and the average long axis of the circular shape is 3.3 mm. The average height of the elliptical cylinder is the single diameter of the mixture. After the shaft extruder is melted and mixed, it is extruded from the τ mold at a resin temperature (10), thereby forming a light guide plate having a thick surface, a width of 2 mm, and a length of 800 _ both sides as a flat surface 151568.doc 201131222 (forming step). <Example 2> In the mixing step, except that 20 parts by mass of the above-mentioned pulverized material and 8 parts by mass of PMMA particles (unused transparent resin) were mixed by a Henschel mixer, the mixture was obtained in the same manner as in Example 1. Manufacturing a light guide plate. <Example 3> In the mixing step, except that the Henschel mixer was mixed with 1 part by mass of the pulverized material and 9 parts by mass of PMMA particles (unused transparent resin) to obtain a mixture, the same procedure as in Example 1 was carried out. Manufacturing a light guide plate. <Comparative Example 1 > A light guide plate was produced in the same manner as in Example i except that the cleaning of the edge material was omitted (not performed). <Comparative Example 2> A light guide plate was produced in the same manner as in Example 2 except that the cleaning of the raw material was omitted (not performed). <Reference Example> The pMMA pellets (Sumitomo Chemical Co., Ltd. [SUMIPEX®], refractive index: transparent resin) were melt-kneaded in a single-axis extruder with a screw diameter of 40 mm, and the resin temperature was 255. 'This is made into a thickness of 4 mm, wide Tang 20fl e :^49) (unused
透明樹脂製造導光板。 對如上所得之各導光板根據下述評估法進行坪估。其結 果顯示於表1。 。其結 151568.doc 201131222 〈光路長300 mm下之可視光之平均光線透射率之測定方法> 如圖2所示，將所得之導光板切斷成寬度5〇 mmx長度 3〇0 mm大小後，以研磨機（朝曰咖叫〇公司製 [PurabeautylOOO])研磨4個側面51，製成測定試驗片5〇。將 該測定試驗片以日立製作所製塑膠特性測定系統（以u_ 341〇型分光光度計及大型試料室積分球附屬裝置構成）， 於300 mmi光路長，波長38〇〜78〇 〇111之範圍以5 nm刻 度測定各波長之光線透射率，將如此所得之光線透射率之 算術平均值作為「可視光之平均光線透射率」。又，邊料 之光路長300 mm下之可視光之平均光線透射率之測定亦與 此相同地進行。 〈光路長300 mm下之YI(黃色度）之測定方法〉 如圖2所示，將所得之導光板切斷成寬度5〇 長度 300 mm大小後，以研磨機（朝曰邮糾〇公司製 [Purabeauty 1000])研磨4個側面5丨，製成測定試驗片％。將 該測定試驗片以日立製作所製塑膠特性測定系統（以队 3410¾刀光光度计及大型試料室積分球附屬裝置構成）， 於300 mm之光路長’波長_之範圍，以5灿刻 度測定主各波長之光線透射率’藉此算出c光源、2度視野下 (汽色度）又，邊料之光路長3 00 mm下之γΐ測定亦與 此相同地進行。 ~ 151568.doc 201131222 表1 廢材之清洗 成形材料之組成(質量份） 評估 未使用之透明樹脂 廢材粉碎物 平均光線透射率(％) YI 實施例1 實施 70 30 85.7 3.0 實施例2 實施 80 20 86.5 2.4 實施例3 實施 90 10 87.2 1.7 比較例1 不實施 70 30 78.5 8.2 比較例2 不實施 80 20 80.2 6.8 參照例 一 100 — 88.3 1.8 由表1清晰所示，以本發明之方法所製成之實施例1〜3之 導光板，雖然係將導光板之製造過程中產生之廢材並用而 製造者，但由於YI充分低因而可出射白色度高之光，且 3 00 mm之光路長中測定之可視光之平均光線透射率為充分 尚之值’因而可確保充分之党度。 與此相對，不進行廢材之清洗而製成之比較例1、2之導 光板不僅YI大，而且300 mm之光路長中測定之可視光之 平均光線透射率係較低之值。 產業上之可利用性 以本發明之製造方法所製造之導光板適於作為液晶顯示 裝置之背光源用導光板使用，但不特別限於如此用途。 【圖式簡單說明】 圖1係顯示以本發明之製造方法所製造之導光板之一實 施形態之立體圖。 圖2係光路長300 mm下之YI(黃色度）之測定方法之說明 圖。 151568.doc -13- 201131222 【主要元件符號說明】 1 導光板 151568.docA light guide plate is manufactured from a transparent resin. The light guide plates obtained as above were evaluated according to the following evaluation method. The results are shown in Table 1. . The knot 151568.doc 201131222 <Method for measuring the average light transmittance of visible light at an optical path length of 300 mm> As shown in Fig. 2, the obtained light guide plate is cut into a width of 5 〇 mmx and a length of 3 〇 0 mm. The four side faces 51 were ground by a grinder (Purabeautyl OOO) to prepare a test piece 5〇. The test piece was made up of a plastic characteristic measuring system manufactured by Hitachi, Ltd. (constituted by a u_341 type spectrophotometer and a large sample room integrating sphere attachment device), and was in the range of 300 mmi optical path length and wavelength 38 〇 to 78 〇〇 111. The light transmittance at each wavelength was measured on a 5 nm scale, and the arithmetic mean of the light transmittance thus obtained was taken as "the average light transmittance of visible light". Further, the measurement of the average light transmittance of visible light at an optical path length of 300 mm was carried out in the same manner. <Measurement method of YI (yellowness) at an optical path length of 300 mm> As shown in Fig. 2, the obtained light guide plate was cut into a width of 5 〇 and a length of 300 mm, and then a grinder was used. [Purabeauty 1000]) Five sides of 5 sides were ground to prepare a test piece %. The measurement test piece was made up of a plastic characteristic measuring system manufactured by Hitachi, Ltd. (consisting of a 34103⁄4 knife photometer and a large sample room integrating sphere attachment device), and measuring the length of the optical path length of 300 mm, which is measured by a 5-can scale. The light transmittance of each wavelength is calculated by calculating the c-light source, the 2 degree field of view (vapor color), and the measurement of γ 下 at an optical path length of 300 mm. ~ 151568.doc 201131222 Table 1 Composition of the cleaning material for waste materials (parts by mass) Evaluation of the average light transmittance (%) of the unused transparent resin waste material YI Example 1 Implementation 70 30 85.7 3.0 Example 2 Implementation 80 20 86.5 2.4 Example 3 Implementation 90 10 87.2 1.7 Comparative Example 1 Not implemented 70 30 78.5 8.2 Comparative Example 2 Not implemented 80 20 80.2 6.8 Reference Example 1 100 - 88.3 1.8 As clearly shown in Table 1, the method of the present invention is used. The light guide plates of the first to third embodiments are manufactured by using the waste materials generated in the manufacturing process of the light guide plate in combination, but the YI is sufficiently low to emit light having a high whiteness, and the optical path length of 300 mm is measured. The average light transmittance of the visible light is sufficient to ensure a sufficient party. On the other hand, the light guide plates of Comparative Examples 1 and 2 which were produced without cleaning the waste material were not only large in YI, but also had a low average light transmittance of the visible light measured in the optical path length of 300 mm. Industrial Applicability The light guide plate manufactured by the manufacturing method of the present invention is suitably used as a light guide plate for a backlight of a liquid crystal display device, but is not particularly limited to such use. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing an embodiment of a light guide plate manufactured by the manufacturing method of the present invention. Fig. 2 is an explanatory view showing a method of measuring YI (yellowness) at an optical path length of 300 mm. 151568.doc -13- 201131222 [Key component symbol description] 1 Light guide plate 151568.doc