l284〇63 九、發明說明： 發明所屬之技術領域 』本發明係關於一種光擴散燈箱片（以下簡稱燈箱片）的 製備方法，燈箱片構造包括一透明聚酯膜，塗佈於其上包 括光擴散層及吸墨顯色層（簡稱吸墨層）的數層塗層。燈箱 片適於以噴墨技術數位彩色列印，用作為車站、百貨公司、 機場等公共地點所使用的背面打光的廣告招牌。 先前技術 從產品性能及結構上分析，一般燈箱片的基本構造包 括在透明的聚醋（例如聚對苯二甲酸乙二醋（polyethyiene terephthalate)，簡稱pET)基材i上塗上三層功能層分別 為光擴散層4、吸墨層3及黏著層2,其結構如圖i所示。 光擴散層4主要功能為分散光源，使燈箱片呈現均勻亮 面，同時要能使墨水迅速穿透，滲入吸墨層，主要成份包 括二氧化鈦及二氧化矽粒子、黏著劑、界面活性劑等；吸 墨層3主要功能為吸收墨水，呈現圖案的色彩飽和鮮艷， 同時必/頁有固&、穩定等功能，避免滲墨、暈墨等現象， 主，成份包括聚乙稀醇或骨膠（gelatin)、界面活性劑等； 黏者層2主要功能為增加塗層與基材之間黏著性，避免功 b層釗：而降低產心。質，主要成分為丙烯酸·苯乙烯共聚 合物黏著劑。 由於燈箱片為具有兩層以上不同成分的層狀結構，目 «箱片的製作方法仍以單層塗佈製程為主。其製程為先 5 1284063 在基材以倒凹版印刷（reverse gravure)塗佈上一層極薄之黏 著層’約介於1〜5#m，烘乾後再利用單層模具塗佈上吸墨， 層塗佈液，娛乾之後收捲，再進行光擴散層的塗佈，洪乾-收捲。如果燈箱片分兩次塗佈吸墨層及光擴散層塗佈液， 第-層良率為80。/。’第二層良率為8〇%，則整體良率為⑽ 或更低。而生產速廋因需要塗佈兩次，耗時較多，烘箱的 能源也損耗較多。同時對燈箱片而言，必須先塗吸墨層， 而吸墨層黏性較高，常含有小顆粒附著於塗佈線的背輪及 滾輪上，再塗光擴散層時，常會產生白色或透明小圓點等❿ 缺陷。 先刖技術關於光擴散燈箱片結構方面，例如美國專利 5,888,629號所揭示，一種具有多層結構的喷墨列印耗材， 即為本文所述之光擴散燈箱片。此美國專利5,888,629號的 燈箱片的塗佈層包含黏著層、吸墨層及光擴散層等多種功 能層，其採用單層塗佈方式，缺點已如前述。美國專利 5,989,701號所揭示之喷墨記錄耗材，包含至少一種含粒子 _ 的塗液以及一層水溶性的吸墨層，文中提到需塗佈兩次以 上’其缺點亦如前述。美國專利6，183,844號所揭示之含有 多層塗佈膜層的喷墨列印耗材，至少含有兩種以上可吸水 性物質，其中之一為吸墨層，另一層為光擴散層，但其說 明書文中並未明確揭示可用同時進行雙層塗佈方式生產燈 箱片。 發明内容 6 1284063 本發明的一主要目的在揭示一種用於同時於一基材上 塗佈兩種塗佈液之模具組及方法。 本發明的另一目的在提出光擴散燈箱片的雙層共擠壓 塗佈模具組及方法。 本發明的另一目的在提出適用於光擴散燈箱片的雙層 共擠壓塗佈的吸墨層及光擴散層塗佈液配方。 本發明所揭示的一種用於共擠壓塗佈的模具組包含： 一個上模、一個下模以及被夾緊於該上模與下模之間的一 個楔形夾片，其中該上模的下表面對應於該楔形夾片的上 表面及該下模的上表面對應於該楔形夾片的下表面，使得 除了一设於該上模的下表面的第一凹槽及一凹陷的第一流 道，及一設於該下模的上表面的第二凹槽及一凹陷的第二 流道之外，該楔形夾片被流體密封於該上模與下模之間； 其中 該上模進一步包含一與該第一凹槽相通之第一進料 口，及該下模進一步包含一與該第二凹槽相通之第二進料 口；及 該第一流道由該第一凹槽延伸至該楔形夾片的一銳 邊’該第二流道由該第二凹槽延伸至該楔形夾片的銳邊， 於疋該第一流道與第二流道在該模具組内不相通，而在該 模形夾片的銳邊匯合並形成一狹縫。 較佳的’該上模與該下模隔著該楔形夾片互相對稱。 較佳的，該第一凹槽及第一流道為位於該上模的下表 面上的”U，，形面所包圍。 1284063 本發明亦提供一種共擠壓塗佈兩種塗層的方法，其係 利用本發明之模具組來達成，該方法包含下列步驟： 將一第一流體、一第二流體分別自該第一進料口、該 第二進料口導入該模具組，其中該第一流體進入該第一凹 槽及第一流道，並向該楔形夾片的銳邊流動，及該第二流 體進入該第二凹槽及第二流道，並向該楔形夾片的銳邊流 動’於是該第一流體和第二流體在該楔形夾片的銳邊匯 合，並由該狹縫流出該模具組；以及 將一基材連續地自該模具組的狹縫的下方通過，而將 該第一流體和第二流體同時塗佈在該基材的一表面上，形 成位於該基材的表面上的第二流體塗層及位於該第二流體 塗層上的第一流體塗層。/ 較佳的，該基材為一透明可撓曲的聚合物基材。 較佳的，該基材包含一黏著層，及該第二流體塗層位 於該黏著層上。 較佳的，該黏著層包含聚丙烯酸或丙烯酸-苯乙烯共聚 物，及該黏著層具有一介於0.1〜5/zm之厚度。 較佳的，該第二流體包含水及一種或多種親水性聚合 物。更佳的，該第二流體包含兩種親水性聚合物，一種為 聚乙烯醇（polyvinyl alcohol，PVA)及另一種為聚乙烯η比口各 酮（polyvinyl pyrrolidone，PVP)。最佳的，該第二流體包含 3 %〜6%的聚乙稀醇及1〜5 %的聚乙烯σ比略酮，以該第二流體 的重量為基準。 較佳的，該第一流體包含水，一種或多種親水性聚合 1284063 物，醇，及選自二氧化鈦或二氧化矽的微粒。更佳的，該 第一流體包含兩種親水性聚合物，一種為聚乙烯醇及另一 種為聚丙稀酸，該醇為異丙醇；及微粒為二氧化鈦。最佳 的’該第一流體包含3。/。〜10%二氧化鈥、3〜8%聚乙烯醇、 0.01 〜1%聚丙烯酸（polyacrylic acid，PAA)、5〜15%異丙醇 (isopropyl alcohol，IPA)，以該第一流體的重量為基準。 較佳的，該第一流體與第二流體之黏度比在i /3〜3/ i 的範圍内。更佳的，該第一流體與第二流體之黏度比在 1/1.5〜1.5/1的範圍内。 較佳的，該第一流體及第二流體的流量比在1 〜3/1 的範圍内。更佳的，該第一流體及第二流體的流量比在 1/1.5〜1.5/1的範圍内。 較佳的，本發明方法進一步包含乾燥該第二流體塗層 及第流體塗層。更佳的，該乾燥的第二流體塗層具有一 介於5〜15// m之厚度，及該乾燥的第一流體塗層具有一介 於3〜l〇vm之厚度。 本發明針對單層塗佈可能發生的缺點加以改進，配合 塗佈液配方利用外部接觸式共擠壓模具同時進行兩種塗佈 液之塗佈，使兩種塗佈液在模具組外部接觸，進而生產出 厚度均勻、界面品質良好的雙層塗膜之塗佈產品，因而大 幅改善單層塗佈時的塗佈缺陷及生產良率，提高經濟效益。 實施方式 依據本發明的一較佳具體實施例，製作一種光擴散燈 1284063 箱片之配方被提供。該燈箱片結構包含基材i、黏著層2、 吸墨層3及光擴散層4四部分，如圖1所示。基材i，可 使用多種塑膠膜進行表面塗佈，包括聚乙烯，烯及聚 酯（例如PET)等多種高分子膜，由於此類塑膠基材具有可撓 性，將有利於連續生產製程。黏著層2 ,為改良式聚丙烯 酸黏著劑，結構為丙烯酸-苯乙烯共聚物，主要功能為增加 塗層與基材間之黏著性，避免功能層剝落而降低產品品 質。吸墨層3，由親水性高分子所組成，例如pvA或 或其他親水性高分子，主要功能在於快速吸收墨水，使列 印圖像之色彩飽和度、色彩準確度均表現良好，並且不致 發生渗墨、暈墨及龜裂等現象發生。光擴散層4，則包含 固體粒子，如Si〇2或Ti〇2或其他固體粒子，其主要功用在 於均勻分散光線’使背面打光之燈管不會現形；及PVA高 分子，其功用在於吸收、滲透墨水，使墨水能快速到達吸 墨層’不至因墨水停留在光擴散層而使圖像無法呈現最佳 狀況；及異丙醇，目的在於除泡並與水形成共沸物，加快 後續的乾燥處理，更利用其高揮發性，可快速乾燥可形成 較鬆散的Ti〇2排列，有助於下墨；及少量聚丙烯酸 (polyacrylic acid，簡稱PAA)，目的在於藉由paa分子在BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preparing a light diffusing light box sheet (hereinafter referred to as a light box sheet), the light box sheet structure comprising a transparent polyester film coated thereon, including light A plurality of layers of the diffusion layer and the ink absorbing coloring layer (abbreviated as the ink absorbing layer). The light box is suitable for digital printing by inkjet technology, and is used as an advertising sign for the back side lighting used in public places such as stations, department stores, and airports. The prior art analyzes product performance and structure. The basic structure of a general light box sheet includes applying three layers of functional layers on a transparent polyester (for example, polyethyiene terephthalate, pET for short). The light diffusion layer 4, the ink receiving layer 3, and the adhesive layer 2 have a structure as shown in FIG. The main function of the light diffusion layer 4 is to disperse the light source, so that the light box piece has a uniform bright surface, and at the same time, the ink can be quickly penetrated and penetrated into the ink absorption layer, and the main components include titanium dioxide and cerium oxide particles, an adhesive, a surfactant, and the like; The main function of the ink-receiving layer 3 is to absorb the ink, and the color of the pattern is saturated and bright, and at the same time, the function of the page is solid and stable, and the phenomenon of bleeding, fainting, and the like is avoided, and the main component includes polyethylene glycol or bone glue ( Gelatin), surfactants, etc.; the main function of the adhesive layer 2 is to increase the adhesion between the coating and the substrate, to avoid the b layer of the work: to reduce the heart. The main component is an acrylic acid-styrene copolymer adhesive. Since the light box piece is a layered structure having two or more layers of different compositions, the method of making the box is still based on a single layer coating process. The process is first 5 1284063. The substrate is coated with a very thin adhesive layer on the substrate by reverse gravure 'about 1~5#m, and then dried and then coated with a single layer mold. The layer coating liquid is taken up after being dried, and then coated with a light diffusion layer, and dried and retracted. If the light box sheet is coated with the ink receiving layer and the light diffusion layer coating liquid twice, the first layer yield is 80. /. The second layer yield is 8〇%, and the overall yield is (10) or lower. The production speed is required to be coated twice, which takes more time, and the energy of the oven is also more lost. At the same time, for the light box piece, the ink absorption layer must be applied first, and the ink absorption layer is highly adhesive, often containing small particles attached to the back wheel and the roller of the coating line, and when the light diffusion layer is coated, it often produces white or Transparent dots and other defects. Prior art relating to the structure of a light diffusing light box, such as that disclosed in U.S. Patent No. 5,888,629, is incorporated herein by reference. The coating layer of the light box sheet of this U.S. Patent No. 5,888,629 comprises a plurality of functional layers such as an adhesive layer, an ink absorbing layer and a light diffusing layer, which are coated by a single layer, and have the disadvantages as described above. The ink jet recording consumable disclosed in U.S. Patent No. 5,989,701, contains at least one coating liquid containing particles _ and a water-soluble ink absorbing layer, which is mentioned above to be coated twice or more. An inkjet printing consumable comprising a multi-layer coating film layer disclosed in U.S. Patent No. 6,183,844 contains at least two kinds of water-absorptive substances, one of which is an ink-absorbing layer and the other of which is a light-diffusing layer, but the specification thereof It is not explicitly disclosed herein that a light box sheet can be produced by simultaneous double coating. SUMMARY OF THE INVENTION 6 1284063 A primary object of the present invention is to disclose a mold set and method for simultaneously coating two coating liquids on a substrate. Another object of the present invention is to provide a two-layer co-extrusion coating die set and method for a light diffusing light box. Another object of the present invention is to provide a two-layer co-extrusion coating ink-receiving layer and a light-diffusing layer coating liquid formulation suitable for use in a light diffusing light box. A mold set for co-extrusion coating disclosed in the present invention comprises: an upper mold, a lower mold, and a wedge clip clamped between the upper mold and the lower mold, wherein the upper mold is lower The surface corresponding to the upper surface of the wedge clip and the upper surface of the lower mold correspond to the lower surface of the wedge clip such that a first groove disposed on the lower surface of the upper mold and a recessed first flow path And a second groove disposed on the upper surface of the lower mold and a recessed second flow path, the wedge clip is fluidly sealed between the upper mold and the lower mold; wherein the upper mold further comprises a first feed port communicating with the first groove, and the lower die further includes a second feed port communicating with the second groove; and the first flow path extending from the first groove to the a sharp edge of the wedge clip, the second flow path extending from the second groove to a sharp edge of the wedge clip, wherein the first flow path and the second flow path are not in communication within the mold set, and The sharp edges of the molded clip merge to form a slit. Preferably, the upper mold and the lower mold are symmetrical to each other across the wedge clip. Preferably, the first groove and the first flow path are surrounded by a U-shaped surface located on a lower surface of the upper mold. 1284063 The present invention also provides a method for co-extruding two coatings. The method is achieved by using the mold set of the present invention, the method comprising the steps of: introducing a first fluid and a second fluid from the first feed port and the second feed port respectively into the mold set, wherein the first a fluid enters the first groove and the first flow path, and flows toward the sharp edge of the wedge-shaped clip, and the second fluid enters the second groove and the second flow path, and sharply faces the wedge-shaped clip Flowing then the first fluid and the second fluid merge at the sharp edge of the wedge clip and exit the mold set from the slit; and a substrate is continuously passed under the slit of the mold set, and Simultaneously coating the first fluid and the second fluid on a surface of the substrate to form a second fluid coating on the surface of the substrate and a first fluid coating on the second fluid coating Preferably, the substrate is a transparent and flexible polymer substrate. Preferably, the substrate comprises an adhesive layer, and the second fluid coating is on the adhesive layer. Preferably, the adhesive layer comprises a polyacrylic acid or an acrylic-styrene copolymer, and the adhesive layer has a thickness of 0.1. Preferably, the second fluid comprises water and one or more hydrophilic polymers. More preferably, the second fluid comprises two hydrophilic polymers, one of which is polyvinyl alcohol (polyvinyl alcohol) , PVA) and the other is polyvinyl pyrrolidone (PVP). Preferably, the second fluid comprises 3% to 6% of polyethylene glycol and 1 to 5% of polyethylene σ ratio. The ketone is preferably based on the weight of the second fluid. Preferably, the first fluid comprises water, one or more hydrophilic polymeric 1284063, an alcohol, and particles selected from the group consisting of titanium dioxide or cerium oxide. More preferably, The first fluid comprises two hydrophilic polymers, one being polyvinyl alcohol and the other being polyacrylic acid, the alcohol being isopropanol; and the microparticles being titanium dioxide. The best 'the first fluid contains 3%. ~10% cerium oxide, 3~8% polyvinyl alcohol, 0.01 ~1% polyacrylic acid (PAA), 5 to 15% isopropyl alcohol (IPA), based on the weight of the first fluid. Preferably, the viscosity of the first fluid and the second fluid Preferably, the ratio of the viscosity of the first fluid to the second fluid is in the range of 1/1.5 to 1.5/1. Preferably, the first fluid and the first The flow ratio of the two fluids is in the range of 1 to 3/1. More preferably, the flow ratio of the first fluid and the second fluid is in the range of 1/1.5 to 1.5/1. Preferably, the method of the present invention further The drying of the second fluid coating and the first fluid coating is included. More preferably, the dried second fluid coating has a thickness of between 5 and 15 / / m, and the dried first fluid coating has an 3~l〇vm thickness. The invention improves the disadvantages that may occur in the single layer coating, and uses the external contact coextrusion mold to simultaneously coat the two coating liquids with the coating liquid formulation, so that the two coating liquids are in contact with the outside of the mold set. Further, a coated product of a two-layer coating film having a uniform thickness and a good interface quality is produced, thereby greatly improving coating defects and production yield during single-layer coating, and improving economic efficiency. Embodiments In accordance with a preferred embodiment of the present invention, a formulation of a light diffusing lamp 1284063 box is provided. The light box piece structure comprises four parts of a substrate i, an adhesive layer 2, an ink receiving layer 3 and a light diffusing layer 4, as shown in FIG. Substrate i can be surface coated with a variety of plastic films, including polyethylene, olefin and polyester (such as PET). Due to the flexibility of such plastic substrates, it will facilitate continuous production. Adhesive layer 2 is a modified polyacrylic acid adhesive with a structure of acrylic-styrene copolymer. Its main function is to increase the adhesion between the coating and the substrate, and to avoid peeling off the functional layer and reducing the quality of the product. The ink receptive layer 3 is composed of a hydrophilic polymer, such as pvA or other hydrophilic polymer, and its main function is to absorb ink quickly, so that the color saturation and color accuracy of the printed image are good and do not occur. Infiltration, fainting, and cracking occur. The light diffusion layer 4 comprises solid particles, such as Si〇2 or Ti〇2 or other solid particles, and its main function is to uniformly disperse the light 'to make the lamp on the back side not appear; and the function of the PVA polymer is Absorbs and penetrates the ink so that the ink can quickly reach the ink-absorbing layer', so that the image does not appear to be optimal due to the ink staying in the light-diffusing layer; and isopropyl alcohol, which aims to defoam and form an azeotrope with water. Accelerate the subsequent drying treatment, and make better use of its high volatility, can quickly dry to form a loose Ti〇2 arrangement, which helps the ink; and a small amount of polyacrylic acid (PAA), which is aimed at the paa molecule. in
Ti〇2表面上的·吸附，產生靜電穩定性以及空間立體穩定 性’來達到均勻分散Ti〇2於溶液中的目的，具類似性質的 高分子亦可被使用並非一定限於PAA ;及少量界面活性 劑’例如氟界面活性劑（Fluorosurfactant)，目的在於降低表 面張力，改善因為表面張力過高而產生之塗佈缺陷。 1284063 依本發明的另一較佳具體實施例，揭示一種將A與B 兩塗佈液，同時形成AB雙層塗膜之模具組及方法。本發 · 明的一特徵在於組合特殊之上模及下模，及介於其間一用 1 於分流之夾片。如圖2及圖3所示，該模具組包含一上模 1〇 與該上模水平對稱之下模1 〇 ’、一楔形夾片2〇。 於本發明之模具組中，該上模10如圖4及圖5所示， 含有位於該上模上表面的一進料口U、位於該上模下表面 的一凹槽12,連接該進料口丨丨和該凹槽ι2的一進料管道 13、位於該上模側邊之一斜面所形成之一上模模肩丨* ;位 馨 於該模肩14與該下表面相鄰邊線之一上模模唇15;位於 該上模下表面由該凹槽12延伸至該模唇15的一凹陷的第 一流道40 ·，以及複數個固定用螺絲孔16。該下模1〇，與上 模1〇具有互相對稱之結構，其與上模1〇相同的元件及部 份以相同的數字但多加一，表示。 於本發明之模具組中，該楔形夾片2〇 (如圖6所示） 包含模肩34及楔形夾片的銳邊所形成的模唇35以及複數 個固定用螺絲孔16”。 _ 如圖2至圖6所示，將該上模1〇,該楔形夾片2〇及 該下模10’藉由螺栓該相對應之螺絲孔16，16，，，，固定地 螺合，於是在該上模模唇15及下模模唇15,及楔形夾片模 唇35形成兩個塗佈液出口 42，42,。當上模具1〇與楔形夾 片2〇疊合時，該凹槽12内的A塗佈液僅能由該塗佈液出 口 42机出該模具組，其餘三邊都被封住。這意味著當a塗 佈液由該進料管道13進入該上模具1〇的凹槽12時，A塗 11 1284063 佈液將只能由該凹槽12沿凹陷的篦、ώ、音/ n 49 . ^ 的第一流道40向塗佈液出 二稱:流動。由於上模具10與下模具10,呈現上下水 因此當該下模具10，與楔形夾片2〇 後’«的’tw由該進料管道13’進人該下料 10的凹槽12’時，B塗佈液將只能由該凹槽12，沿凹陷的第 二流道40,向塗佈液出口 42,的方向流動，由該塗佈液出口 42流出該模具組。於是當A與B兩塗佈液各自向塗佈液出 口 42’ 42’流出，於模具組外部接觸時，將形成一具有雙層 塗佈膜層的流體，塗佈在所被選用的基材（未示於圖中）上曰。 於本發明中，該上模10,該下模1〇,及該模形爽片2〇 在該模具組出口側各具有模肩（die sh〇ulder )(分別為 14、14 及 34)及模唇（die lip)(分別為 15、15, ' 35)之 結構（如圖2及3所示）。該模唇及模肩設計之目的在於塗 佈時能在被塗佈基材表面形成穩定之塗佈區。 本發明的一連續式塗佈製程，包含先在pET基材上塗 佈上黏著層，烘乾後隨即利用本發明雙層共擠壓塗佈方式 同時塗佈上吸墨層及光擴散層，經烘箱烘乾後收捲，即可 得到成品。礙於經費及設備限制，並未進行。於下列的實 施例4及5，直接使用未塗佈黏著層的PET基材，進行連 續式同時塗佈上吸墨層及光擴散層的實驗。 實施例 例1、配方組成 光擴散層（塗層1於圖2)是一種具有丁丨〇2粒子以及如 12 1284063 表一成分之分散塗液，而吸墨層是由親水性高分子水溶液 所組成，包括PVA及PVP高分子，詳細組成如表二所示。 基材為PET膜，膜厚為100 μηι。 光擴散層配方塗液詳細配製方法：將PAA (ALDRICH 公司，分子量2000)緩緩放入逆滲透（RO)水中，以1000 rpm 攪拌30分鐘，將Ti02 (DuPont公司，R960)，緩緩放入先 前溶液中，以2000 rpm攪拌3小時，將IPA (聯工化學公 司，台灣），以及FSO-100 (DuPont公司），緩緩放入先前溶 液中，以2000 rpm攪拌1小時，最後將PVA (分子量 120000，台灣長春石化公司，代號BP2420)，緩緩放入先 前溶液中，以100 rpm攪拌3小時，完成光擴散配方的配 製，其相對重量百分比如表一所示。 吸墨層配方塗液詳細配製方法：將PVP (代號K-90, ISP 公司，USA)緩緩放入RO水中，以300 rpm攪拌2小時，待 PVP完全溶解於RO水後，再緩緩加入PVA (分子量 120000，台灣長春石化公司，代號BP2420)，以100 rpm攪 拌5小時，完成吸墨層配方之配製，其相對重量百分比如 表二所示。 13 1284063 表一 光擴散層塗液成分： RO水 80.16% PAA (Aldrich，USA，分子量 2000) 0.2% Ti02 (R960, Du Pont 公司） 4.9% ΙΡΑ (聯工化學，台灣） 9.8% FSO-100 (DuPont) 0.04% PVA(BP2420，長春石化，台灣） 4.9% 表二 吸墨層塗液成分： RO水 92% PVA (BP2420，長春石化，台灣） 5% PVP (K-90, ISP 公司，USA) 3%The adsorption on the surface of Ti〇2 produces electrostatic stability and spatial stereo stability' to achieve the purpose of uniformly dispersing Ti〇2 in solution. Polymers with similar properties can also be used without limitation to PAA; An active agent, such as a fluorosurfactant, is intended to reduce surface tension and improve coating defects due to excessive surface tension. 1284063 According to another preferred embodiment of the present invention, a mold set and method for simultaneously forming an A and B coating liquid to form an AB double layer coating film are disclosed. A feature of the present invention is the combination of a special upper mold and a lower mold, and a clip interposed between them. As shown in Fig. 2 and Fig. 3, the mold set includes an upper mold 1 〇 and a horizontally symmetrical mold 1 〇 ', and a wedge clip 2 〇. In the mold set of the present invention, the upper mold 10, as shown in FIG. 4 and FIG. 5, includes a feed port U on the upper surface of the upper mold, and a groove 12 on the lower surface of the upper mold. a feed port 13 and a feed pipe 13 of the groove ι2, and an upper die shoulder formed by one of the slopes of the upper side of the upper die; the edge of the die shoulder 14 adjacent to the lower surface An upper mold lip 15; a concave first flow passage 40 extending from the recess 12 to the lip 15 of the upper mold, and a plurality of fixing screw holes 16. The lower mold 1〇 has a structure symmetrical to the upper mold 1〇, and the same elements and parts as the upper mold 1〇 are represented by the same number but by one. In the mold set of the present invention, the wedge clip 2 (shown in FIG. 6) includes a lip 35 formed by the shoulder 34 and the sharp edge of the wedge clip, and a plurality of fixing screw holes 16". As shown in FIG. 2 to FIG. 6 , the upper mold 1 〇, the wedge clip 2 〇 and the lower mold 10 ′ are fixedly screwed by bolts corresponding to the screw holes 16 , 16 , and thus The upper die lip 15 and the lower die lip 15 and the wedge-shaped die lip 35 form two coating liquid outlets 42, 42. When the upper die 1 is overlapped with the wedge-shaped clip 2, the groove The A coating liquid in 12 can only be driven out of the mold set by the coating liquid outlet 42, and the other three sides are sealed. This means that when a coating liquid enters the upper mold 1 from the feeding pipe 13 When the groove 12 is formed, the A coating 11 1284063 liquid will only be discharged from the groove 12 along the first flow path 40 of the depressions, ώ, sounds / n 49 . ^ to the coating liquid: flow. The mold 10 and the lower mold 10 are presented with water and water. Therefore, when the lower mold 10 and the wedge-shaped clip 2 are turned into the groove 12' of the blank 10 from the feed pipe 13', B The coating liquid will only be covered by the concave 12, flowing along the recessed second flow path 40 in the direction of the coating liquid outlet 42, and flowing out of the mold set from the coating liquid outlet 42. Then, the coating liquids A and B are each directed to the coating liquid outlet 42. '42' flows out, and when it contacts the outside of the mold set, a fluid having a two-layer coating film layer is formed and coated on the selected substrate (not shown). In the present invention, The upper mold 10, the lower mold 1〇, and the molded cooling sheet 2 have die shoulders (14, 14 and 34, respectively) and a die lip on the outlet side of the mold set. The structure (15, 15, '35, respectively) (shown in Figures 2 and 3). The lip and shoulder design is designed to form a stable coating zone on the surface of the coated substrate during coating. A continuous coating process of the present invention comprises first coating an adhesive layer on a pET substrate, and then drying the ink-absorbing layer and the light-diffusing layer simultaneously by the double-layer co-extrusion coating method of the present invention. After drying in an oven, the product can be obtained, which is not carried out due to the limitation of funds and equipment. In the following Examples 4 and 5, the uncoated adhesive is directly used. The layered PET substrate was subjected to an experiment of simultaneously applying the upper ink absorption layer and the light diffusion layer in a continuous manner. Example 1, Formulation Composition Light diffusion layer (Coating layer 1 in Fig. 2) is a particle having Ding 2 And the dispersion coating liquid of the composition of Table 12, and the ink absorption layer is composed of a hydrophilic polymer aqueous solution, including PVA and PVP polymer, and the detailed composition is shown in Table 2. The substrate is a PET film, and the film thickness is 100 μηι. Light diffusion layer formulation coating method: PAA (ALDRICH, molecular weight 2000) is slowly placed in reverse osmosis (RO) water, stirred at 1000 rpm for 30 minutes, and Ti02 (DuPont, R960) is slowed down. Slowly put in the previous solution, stir at 2000 rpm for 3 hours, slowly put IPA (Liangong Chemical Company, Taiwan), and FSO-100 (DuPont) into the previous solution, stir at 2000 rpm for 1 hour, and finally PVA (molecular weight 120000, Taiwan Changchun Petrochemical Company, code BP2420) was slowly placed in the previous solution and stirred at 100 rpm for 3 hours to complete the preparation of the light-diffusing formulation. The relative weight percentages are shown in Table 1. Ink-receiving layer formulation coating method: Prepare PVP (code K-90, ISP company, USA) slowly into RO water, stir at 300 rpm for 2 hours, wait until PVP is completely dissolved in RO water, then slowly add PVA (molecular weight 120000, Taiwan Changchun Petrochemical Company, code BP2420) was stirred at 100 rpm for 5 hours to complete the formulation of the ink-receiving layer. The relative weight percentages are shown in Table 2. 13 1284063 Table 1 Light diffusion layer coating composition: RO water 80.16% PAA (Aldrich, USA, molecular weight 2000) 0.2% Ti02 (R960, Du Pont) 4.9% ΙΡΑ (Liangong Chemical, Taiwan) 9.8% FSO-100 ( DuPont) 0.04% PVA (BP2420, Changchun Petrochemical, Taiwan) 4.9% Table 2 Ink Absorbent Coating Composition: RO Water 92% PVA (BP2420, Changchun Petrochemical, Taiwan) 5% PVP (K-90, ISP Company, USA) 3%
例2、配方組成 本實施例的配方如表三及四所示，其與例1類似，但 光擴散層之T i Ο 2種類及吸墨層配方比例略有改變。Example 2. Formulation The formulation of this example is shown in Tables 3 and 4, which is similar to Example 1, but the T i Ο 2 type of the light diffusion layer and the formulation ratio of the ink absorbing layer are slightly changed.
表三 光擴散層塗液成分： RO 水 80.16% PAA (Aldrich, USA,分子量 2000) 0.2%Table 3 Light diffusion layer coating composition: RO water 80.16% PAA (Aldrich, USA, molecular weight 2000) 0.2%
Ti02 (A-HR，Du Pont 公司） 4·90/〇 ΙΡΑ (聯工化學，台灣） 9.8% FSO-100 (DuPont) 0.04% PVA(BP2420,長春石化，台灣） 4.9% 14 1284063 表四 吸墨層塗液成分： RO水 92% PVA (BP2420, 長春石化，台灣） 6% PVP (K-90, ISP 公司，USA) 2% 例3、配方組成 本實施例的配方如表五及六所示，其與例1類似，但 光擴散層之配方比例略有改變。Ti02 (A-HR, Du Pont) 4·90/〇ΙΡΑ (Liangong Chemical, Taiwan) 9.8% FSO-100 (DuPont) 0.04% PVA (BP2420, Changchun Petrochemical, Taiwan) 4.9% 14 1284063 Table 4 Layer coating composition: RO water 92% PVA (BP2420, Changchun Petrochemical, Taiwan) 6% PVP (K-90, ISP company, USA) 2% Example 3. Formulation The formulation of this example is shown in Tables 5 and 6. It is similar to Example 1, but the formulation ratio of the light diffusion layer is slightly changed.
表五 光擴散層塗液成分： RO水 PAA (Aldrich, USA,分子量 2000) Ti02 (R960, Du Pont 公司） IPA (聯工化學，台灣） FSO-100 (DuPont) PVA(BP24205長春石化，台灣） 74% 1% 8.32% 8.32% 0.04% 8.32% 表六 吸墨層塗液成分： RO水 92% PVA(BP2420，長春石化，台灣） 5% PVP (Κ·90, ISP 公司，USA) 3%Table 5. Light diffusion layer coating composition: RO water PAA (Aldrich, USA, molecular weight 2000) Ti02 (R960, Du Pont) IPA (Liangong Chemical, Taiwan) FSO-100 (DuPont) PVA (BP24205 Changchun Petrochemical, Taiwan) 74% 1% 8.32% 8.32% 0.04% 8.32% Table 6 Ink absorption layer coating composition: RO water 92% PVA (BP2420, Changchun Petrochemical, Taiwan) 5% PVP (Κ·90, ISP company, USA) 3%
黏著性測試實驗 1.實驗目的 本部分的實驗主要在改善未前處理之PET膜與功能性 塗層之間的黏著性。改善方法為在PET基材上預先手塗上 15 1284063 丙烯酸-苯乙烯共聚物之黏著劑作為黏著層（primer)，烘乾 後依序再手塗上吸墨層及光擴散層，得到成品後進行黏著 性測試。 2.實驗材料 實驗所使用之基材為PET膜，由日本SCHMIDT公司 所製造，型號為AS-100，膜厚為100 μιη。丙烯酸-苯乙烯共 聚物黏著劑為荷蘭Neoresins公司所製造，型號為Α1 092 及A112 0。吸墨層與光擴散層配方則使用實施例一至三所 製備者。 +黏著層塗佈液成分：重量百分比 RO Water 45% 丙烯酸-苯乙烯共聚物黏著劑 (Neoresins，A1092 ) _ 5 5% 3 ·實驗結果 利用手塗方式所得到之成品，黏著層膜厚介於卜3 μιη 之間，吸墨層膜厚介於5〜15 μηι之間與光擴散層膜厚介於 3〜10 μπι之間。黏著性測試則根據美國ASTMD3359-95a 之標準進行分析。根據實驗結果，我們發現有無加入黏著 層，對於基材與吸墨層與光擴散層塗層之黏著性影響甚 大。若PET基材未塗佈黏著層即塗佈上吸墨層及光擴散 層，其黏者性測试結果最差，屬於〇B的等級。若pet基 材先經塗佈有黏著層，再塗佈上吸墨層及光擴散層，其黏 著性測試結果顯示黏著性明顯提升，介於3b〜4b之間。 1284063 經由以上實施例一配方製作而得的光擴散燈箱片，其 光擴散能力以及列印品質均十分良好。光擴散能力係經由 將燈箱片置於背面打光的燈管前，燈管並不會現形，並且 呈現一均勻的亮面；列印測試好壞的判斷標準係利用繪圖 機（11?(168丨§1^1 5000)列印標準圖檔後，觀察其下墨性、下 墨快慢、是否暈墨滲墨以及色彩準確度幾項重要性質。 以上實施例二配方亦可製作出良妤的光擴散燈箱片， 其光擴散能力以及列印測試之表現亦十分良好。 例3的配方屬於失敗的配方，經由此配方製作而成的 燈箱片’墨水無法完全透過光擴散層，導致色彩表現差， 即便調整光擴散層的厚度，下墨性亦無法得到提昇，因此 此配方為失敗的配方。 例4、製程參數 使用圖2至6所示的模具組進行本實施例，其中模具 組的塗佈液出口 42(42，）具有350 μπι的高度及l〇cm的寬 度。使用實施例1之配方塗液對未塗佈有黏著層的PET基 材進行共擠壓塗佈。在塗佈時需要控制之參數包含塗液流 量比、黏度比、塗佈速率、基材張力、烘箱之喷嘴風速及 乾燥溫度，詳細參數如表七所示。塗佈機為曰本Inokin公 司所製實驗機。 17 !284063 表七 雙層共擠壓塗佈參數 • 烘箱溫度（共三節） 80°C 5100°C ,130°C 喷嘴風速（共三節） 20Hz，30Hz，30Hz 塗佈速率 1.5 m/min 基材張力 貯料筒（unwinder) 3.5kg/w 塗佈器入口（coater inlet) 3 ·0 kg/w 乾燥器出口（dryer outlet) 3.0 kg/w 捲揚機（winder) 4.0 kg/w 塗液流量比（上層：下層） 1:1 一塗液黏度比（上層：下層） 1:2 經由此連續製程製作而得之光擴散燈箱片，由於可經 由預先的計算，其各塗層厚度均在控制之内，並且塗層的 均勻性及緊密度均十分良好，判斷標準係經由掃描式電子 顯微鏡（scanning electron microscope，SEM)剖面圖分析得 知。 例5、製程參數 與例4相同塗佈方式’但是製程參數略有不同，詳細 參數如表八所示。 18 1284063 表八 雙層共擠壓塗佈參數： 烘箱溫度（共三節） 80〇C，100〇C，130〇C 喷嘴風速（共三節） 20Hz，30Hz，30Hz 塗佈速率 2.0m/min 基材張力 貯料筒（unwinder) 3.5kg/w 塗佈器入口（coater inlet) 3.0 kg/w 乾燥器出口（dryer outlet) 3.0 kg/w 捲揚機（winder) 4.0 kg/w 塗液流量比（上層：下層） 1:1 塗液黏度比（上層：下層） 1:2 經由此製程得到之光擴散燈箱片，由於其塗佈速率較 快，導致光擴散層厚度太薄，造成燈箱片光擴散能力不足， 燈管會顯現出來，屬於一個失敗的塗佈製程。必須針對流 量及塗佈速率再進行調整。 本發明已被描述於上，熟悉本技術的人士仍可作出未 脫離下列申請專利範圍的多種變化及修飾。 圖式簡單說明 圖1為光擴散燈箱片的基本結構剖面示意圖 圖2為本發明的外部接觸式共擠壓塗佈模具組之立體 結構示意圖。 圖3為圖2模具組之側視示意圖。 圖4為圖2中模具組的上膜之側視示意圖。 19 1284063 圖5為圖2中模具組的上膜之下表面的平面示意圖。 圖6為圖2中模具組的楔形夾片之立體示意圖。 圖號說明： 1為基材 2為黏著層 3為吸墨層 4為光擴散層 10、10’為上下模 11為進料口 12、 12’為凹槽 13、 1 3 ’為進料管道 14、 14’為上下模具模肩 1 5、1 5 ’為上下模具模唇 16、16’、16”為螺絲孔 20為楔形夾片 34為楔形夾片模肩 35為楔形夾片模唇 40、40’為第一、二流道 42、42’為塗料出口 A、B為塗佈液 20Adhesion test experiment 1. Purpose of the experiment The experiments in this part mainly improve the adhesion between the untreated PET film and the functional coating. The improvement method is to apply 15 1284063 acrylic-styrene copolymer adhesive as a primer on the PET substrate, and then apply the ink absorption layer and the light diffusion layer in sequence after drying to obtain the finished product. Perform adhesive test. 2. Experimental materials The substrate used in the experiment was a PET film manufactured by SCHMIDT, Japan, model AS-100, and had a film thickness of 100 μm. The acrylic-styrene copolymer adhesive was manufactured by Neoresins, The Netherlands, and was modeled as Α1 092 and A112 0. The ink absorbing layer and light diffusing layer formulations were prepared using the examples 1 to 3. +Adhesive layer coating liquid composition: Weight percentage RO Water 45% Acrylic-styrene copolymer adhesive (Neoresins, A1092) _ 5 5% 3 ·Experimental results The finished product obtained by hand coating method, the thickness of the adhesive layer is between Between 3 μιη, the film thickness of the ink-absorbing layer is between 5 and 15 μm and the film thickness of the light-diffusing layer is between 3 and 10 μm. Adhesion testing was performed according to the American ASTM D3359-95a standard. Based on the experimental results, we found that the presence or absence of the adhesion layer has a great influence on the adhesion of the substrate to the ink-absorbing layer and the light-diffusing layer coating. If the PET substrate is coated with an adhesive layer, that is, an ink absorbing layer and a light diffusion layer are applied, the adhesion test result is the worst, belonging to the grade of 〇B. If the pet substrate is coated with an adhesive layer and then coated with an ink absorbing layer and a light diffusion layer, the adhesion test results show that the adhesion is significantly improved, between 3b and 4b. 1284063 The light diffusing light box piece produced by the above formula 1 has excellent light diffusing ability and printing quality. The light diffusing ability is based on placing the light box piece in front of the lamp that is lighted on the back side, and the light tube does not appear in shape, and presents a uniform bright surface; the judgment standard of the printing test is using a plotter (11?丨§1^1 5000) After printing the standard image file, observe the important properties of ink immersion, ink speed, ink bleed and color accuracy. The above formula 2 can also be used to make good The light diffusing light box, its light diffusing ability and the performance of the printing test are also very good. The formula of Example 3 is a failed formula, and the light box piece made by this formula can't completely pass through the light diffusing layer, resulting in poor color performance. Even if the thickness of the light diffusion layer is adjusted, the ink repellency cannot be improved, so this formulation is a failed formulation. Example 4, Process Parameters The present embodiment was carried out using the mold set shown in Figs. 2 to 6, in which the mold set was coated. The cloth liquid outlet 42 (42,) has a height of 350 μm and a width of l〇cm. The PET substrate not coated with the adhesive layer is co-extruded by the formulation liquid of Example 1. Need to control It includes the coating liquid flow ratio, viscosity ratio, coating rate, substrate tension, nozzle nozzle wind speed and drying temperature. The detailed parameters are shown in Table 7. The coating machine is a test machine made by Sakamoto Inokin Co., Ltd. 17 !284063 Seven-layer co-extrusion coating parameters • Oven temperature (three sections) 80°C 5100°C, 130°C Nozzle wind speed (three sections total) 20Hz, 30Hz, 30Hz Coating rate 1.5 m/min Substrate tension storage cylinder (unwinder) 3.5kg/w coater inlet 3 ·0 kg/w dryer outlet 3.0 kg/w winder 4.0 kg/w coating flow ratio (upper: lower) 1 :1 A coating liquid viscosity ratio (upper layer: lower layer) 1:2 The light diffusing light box piece produced by this continuous process, because of the pre-calculation, the thickness of each coating layer is under control, and the coating layer The uniformity and tightness were very good, and the judgment criteria were analyzed by scanning electron microscope (SEM) profile analysis. Example 5, the process parameters were the same as those of Example 4, but the process parameters were slightly different. specification 18 1284063 Table 8 Double-layer co-extrusion coating parameters: oven temperature (three sections) 80〇C, 100〇C, 130〇C nozzle wind speed (three sections total) 20Hz, 30Hz, 30Hz coating rate 2.0m/min substrate tension storage drum (unwinder) 3.5kg/w coater inlet 3.0 kg/w dryer outlet 3.0 kg/w winder 4.0 kg/w coating liquid Flow ratio (upper layer: lower layer) 1:1 coating liquid viscosity ratio (upper layer: lower layer) 1:2 The light diffusion light box piece obtained by this process, due to its faster coating rate, the thickness of the light diffusion layer is too thin, resulting in a light box The light diffusion capacity of the film is insufficient, and the lamp will appear, belonging to a failed coating process. Adjustments must be made to the flow rate and coating rate. The invention has been described above, and many variations and modifications may be made without departing from the scope of the following claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing the basic structure of a light diffusing lamp box. Fig. 2 is a perspective view showing the external contact coextrusion coating die set of the present invention. Figure 3 is a side elevational view of the mold set of Figure 2. Figure 4 is a side elevational view of the upper film of the mold set of Figure 2. 19 1284063 Figure 5 is a plan view showing the lower surface of the upper film of the mold set of Figure 2. Figure 6 is a perspective view of the wedge clip of the mold set of Figure 2. Description of the drawings: 1 is the substrate 2 is the adhesive layer 3 is the ink absorption layer 4 is the light diffusion layer 10, 10' is the upper and lower mold 11 is the feed port 12, 12' is the groove 13, 1 3 ' is the feed pipe 14, 14' is the upper and lower mold shoulders 1 5, 1 5 'is the upper and lower mold lips 16, 16', 16" for the screw hole 20 is the wedge clip 34 is the wedge clip shoulder 35 is the wedge clip lip 40 40' is the first and second flow passages 42, 42' for the paint outlets A and B as the coating liquid 20