1293343 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種光致發光纖維，特別是有關於一 種具有芯鞘結構之光致發光纖維。 【先前技術】 光致發光纖維係為一種在特定波長之光線或自然光線 Φ 照射下會發出螢光之纖維。光致發光纖維用途廣泛，例如 應用在鈔票或物品之防偽、舞台裝潰、汽車改裝、玩具等 用途上。 目前具有數種製造光致發光纖維的方法，例如將有機 、 螢光化合物溶解於溶劑中，再以塗佈纖維或浸潤的方式將 、 彳機螢光化合物附著在纖維或織物表面上。X或是利用熔 融紡絲法將如硫化辞等金屬酸鹽、有機化合物等光致發光 物質混入製造纖維之熱塑性材料中，來達到賦予纖維光致 發光的能力。 然而，上述方法均有其缺點，例如若以浸潤或塗佈的 方式來製造光致發光纖維，當此種纖維經過數次水洗或摩 擦之後一附著在纖維外表上的光致發光物質會逐漸脫落而 失去發光能力。而混入纖維中的金屬酸鹽粉末或其他有機 化口物（如聚s曰、聚乙烯）則會造成纖維強度下降或紡絲性差 等問題。並且，不論是添加有機化合物或是金屬酸鹽粉末 之光致發光纖維均未具有芯勒結構，其成本高昂且不具複 合機能。 因此目前需要一種光致發光纖維及其製造方法，期能 1293343 賦予纖維長效發光能力，同時容易紡製JL成本較低。 【發明内容】 因此本發明的目的在於提供一種具有芯鞠結構的光致 發光纖維。 本發明的另一目的在於提供一種具有芯鞘結構之光致 發光纖維的製造方法。 根據本發明之上述目的，提出一種具有芯鞘結構的光 致發光纖維。依照本發明一較佳實施例，此光致發光纖維 至少具有一層芯層以及一層鞘層，其中鞘層會包覆住芯 層。芯層與鞘層可由相同或不同的熱塑性材料所構成。並 且鞘層之熱塑性材料中含有至少一種光致發光物質。此 外，此光致發光纖維更可具有複數層芯層，其中至少一層 芯層之熱塑性材料中含有光致發光物質。 根據本發明之目的，提出一種光致發光纖維製造方 法依知、本奄明一較佳實施例，係混合一種熱塑性材料與 一種光致發光物質以製造出一種光致發光母粒。亦可在數 種熱塑性材料中，或是在同一種熱塑性材料中分別混入數 種不同光致發光物質以形成數種光致發光母粒。 利用熔融紡絲法使至少一種光致發光母粒與至少一種 熱塑性材料形成具有芯鞘結構之一光致發光纖維，其中光 致發光母粒會形成纖維之鞘層，而熱塑性材料形成纖維之 芯層。 亦可使用數種光致發光母粒與數種熱塑性材料來形成 具有一層光致發光鞘層、至少一層光致發光芯層以及至少 7 1293343 一層不含光致發光物質的芯層。 更可根據本發明來提出一種防偽物品，其至少含有具 芯鞘結構且鞘層含有一光致發光物質的光致發光纖維。 八中光致發光物質可為有機稀土金屬錯合物，如稀土族金 屬偶氮錯合物或稀土族金屬有機酸錯合物。 、熱塑性材料可為聚丙烯、聚酯、尼龍（Nyl〇n)、聚乙烯 或♦乙烯醇。且光致發光物質與熱塑性材料之混合比例約 "於10 ppm至1〇重量百分比（1〇 % w/w)。熔融紡絲之溫度 範圍約介於130 t：至4〇〇它之間。 此外，在製造光致發光母粒的混合過程中，更可添加 改質劑，例如聚烯類、S〇LSPERSE21〇〇〇分散劑、乙烯_ 酉曰酉夂乙烯共聚物（ethylene_vinylAcetate c叩叫脱⑻。而在 該熔融紡絲步驟中更可添加高分子助熔劑（如鄰位乙基甲 苯與磺醯胺混合物、對位乙基甲苯與磺醯胺混合物或聚西旨 可塑劑）或抗氧化劑（如碘化合物、亞磷酸酯類、胺類抗氧化 劑、硫醇基苯並咪唑或銅類無機鹽），以幫助紡絲。 本發明之優點在於纖維中的光致發光物質即使經過多 次水洗或摩擦也不易脫落，達到長效發光之目的。 本發明之另一優點在於所使用之光致發光物質在各種 熱塑性材料中之發光效果良好、可紡性佳，故在不添加助 劑的情況下即可輕易加工成絲。且更可添加助劑來幫助降 低纺絲溫度，或是幫助順利抽絲。 本發明更有一優點在於光致發光纖維具有芯鞘結構， 其含有光致發光物質之鞘層可產生良好的發光效果。不含 光致發光物質的芯層可減少光致發光物質之使用量進而降 1293343 低成本，同時增加纖維強度，並賦予纖維複合機能。 【實施方式】 本發明混合-種熱塑性材料與一種光致發光物質以形 成一種光致發光母粒。亦可在數種熱塑性材料中，或是在 同-種熱塑性材料中分別混人數種不同光致發光物質，而 形成數種光致發光母粒。 此外，在製造光致發光母粒的混合過程中，更可添加 改質劑，例如聚烯類、S〇LSPERSE21〇〇〇分散劑、乙稀一 醋酸乙烯共聚物或抗氧化劑（如蛾化合物、亞磷酸酯類、胺 類抗氧化劑、硫醇基苯並咪唑或銅類無機鹽）。改質劑與抗 =化劑之作用在於保護光致發光物質不會因為受熱塑性材 料之分子極性或其他物理化學性質影響，或避免光致發光 物貝與熱塑性材料發生反應或是在紡絲過程中因光致發光 分子氧化而喪失發光能力。由於光致發光物質價格昂貴， 更可添加改質劑或抗氧化劑來保護光致發光物質之發光性 2，進而降低在熱塑性材料中光致發光物質的添加量，而 传到以較低成本達到相同發光效果之目的。1293343 IX. Description of the Invention: [Technical Field] The present invention relates to a photoluminescent fiber, and more particularly to a photoluminescent fiber having a core-sheath structure. [Prior Art] A photoluminescence fiber is a fiber which emits fluorescence when irradiated with light of a specific wavelength or natural light Φ. Photoluminescent fibers are widely used, for example, in the security of banknotes or articles, stage collapse, car modification, toys, and the like. There are currently several methods for producing photoluminescent fibers, such as dissolving organic, fluorescent compounds in a solvent, and attaching the fluorescing compound to the surface of the fibers or fabric in the form of coated fibers or impregnation. X is a method in which a photoluminescence substance such as a metal salt such as a sulfurized metal or an organic compound is mixed into a thermoplastic material for producing a fiber by a melt spinning method to impart photoluminescence to the fiber. However, the above methods have their disadvantages. For example, if the photoluminescent fiber is produced by wetting or coating, the photoluminescent material attached to the outer surface of the fiber gradually falls off after the fiber is washed or rubbed several times. And lose the ability to shine. However, the metal acid salt powder or other organic chemical substances (e.g., polythene, polyethylene) mixed in the fiber cause problems such as a decrease in fiber strength or a poor spinnability. Further, neither the organic compound nor the metal acid salt powder has a core structure, which is expensive and has no complex function. Therefore, there is a need for a photoluminescent fiber and a method for its manufacture. The energy of 1293343 gives the fiber a long-lasting luminous ability, and at the same time, it is easy to spin the JL at a lower cost. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a photoluminescent fiber having a core structure. Another object of the present invention is to provide a method of producing a photoluminescent fiber having a core-sheath structure. According to the above object of the present invention, a photoluminescent fiber having a core-sheath structure is proposed. In accordance with a preferred embodiment of the present invention, the photoluminescent fiber has at least one core layer and a sheath layer, wherein the sheath layer covers the core layer. The core layer and the sheath layer may be composed of the same or different thermoplastic materials. And the thermoplastic material of the sheath contains at least one photoluminescent substance. Further, the photoluminescent fiber may further have a plurality of core layers, wherein at least one of the core layers of the thermoplastic material contains a photoluminescent substance. In accordance with the purpose of the present invention, a method of fabricating a photoluminescent fiber is disclosed. In accordance with a preferred embodiment of the present invention, a thermoplastic material and a photoluminescent material are mixed to produce a photoluminescent masterbatch. A plurality of different photoluminescent materials may also be incorporated into the plurality of thermoplastic materials or in the same thermoplastic material to form a plurality of photoluminescent masterbatches. Forming at least one photoluminescent masterbatch with at least one thermoplastic material by melt spinning to form a photoluminescent fiber having a core-sheath structure, wherein the photoluminescent masterbatch forms a sheath of fibers, and the thermoplastic material forms a core of fibers Floor. A plurality of photoluminescent masterbatches and a plurality of thermoplastic materials may also be used to form a core layer having a photoluminescent sheath, at least one photoluminescent core layer, and at least 7 1293343 layers of photoluminescent material. Further, according to the present invention, an anti-counterfeit article comprising at least a photoluminescent fiber having a core-sheath structure and a sheath layer containing a photoluminescent substance can be proposed. The octaphotoluminescent material may be an organic rare earth metal complex such as a rare earth metal azo complex or a rare earth metal organic acid complex. The thermoplastic material may be polypropylene, polyester, nylon (Nyl〇n), polyethylene or ♦ vinyl alcohol. And the mixing ratio of the photoluminescent substance to the thermoplastic material is about <10 ppm to 1% by weight (1% w/w). The melt spinning temperature ranges from about 130 t: to about 4 Torr. In addition, in the process of mixing the photoluminescent masterbatch, a modifier such as a polyolefin, a S〇LSPERSE21〇〇〇 dispersant, or an ethylene_vinyl copolymer (ethylene_vinylAcetate c叩) can be added. (8) In the melt spinning step, a polymer flux (such as a mixture of ortho-ethyltoluene and sulfonamide, a mixture of para-ethyltoluene and sulfonamide or a poly-plasticizer) or an antioxidant may be added. (such as iodine compounds, phosphites, amine antioxidants, thiol benzimidazoles or copper inorganic salts) to aid in spinning. The invention has the advantage that the photoluminescent substances in the fibers are washed after repeated washings. Or the friction is not easy to fall off, and the purpose of long-lasting luminescence is achieved. Another advantage of the present invention is that the photoluminescent material used has good luminescent effect and good spinnability in various thermoplastic materials, so no additive is added. The yarn can be easily processed into a wire, and an auxiliary agent can be added to help reduce the spinning temperature, or to facilitate smooth spinning. The present invention has an advantage in that the photoluminescent fiber has a core-sheath structure. The sheath containing the photoluminescent material produces a good luminescent effect. The core layer containing no photoluminescent material can reduce the amount of photoluminescent material used and thus reduce the low cost of 1,293,343, while increasing the fiber strength and imparting fiber composite function. [Embodiment] The present invention mixes a thermoplastic material with a photoluminescent material to form a photoluminescent masterbatch. It is also possible to mix different kinds of light in several thermoplastic materials or in the same thermoplastic material. A photoluminescent substance is formed to form several photoluminescent masterbatches. Further, in the process of mixing the photoluminescent masterbatch, a modifier such as a polyolefin, a S〇LSPERSE 21〇〇〇 dispersant, and B may be added. a dilute vinyl acetate copolymer or an antioxidant (such as a moth compound, a phosphite, an amine antioxidant, a thiol benzimidazole or a copper inorganic salt). The modifier and the anti-chemical agent act to protect the light. The luminescent material is not affected by the molecular polarity or other physicochemical properties of the thermoplastic material, or the photoluminescent material is prevented from reacting with the thermoplastic material or in the spinning In the silk process, the photoluminescence molecule loses its luminescence ability due to oxidation. Since the photoluminescent material is expensive, a modifier or an antioxidant can be added to protect the luminescence of the photoluminescent material, thereby reducing the photoluminescence in the thermoplastic material. The amount of luminescent material added is transferred to achieve the same luminescent effect at a lower cost.
Ik後利用溶融紡絲法將一種上述光致發光母粒與一 種熱塑性材料製備成具有芯鞘結構的光致發光纖維。其中 光致發光母粒會形成纖維之鞘層，而熱塑性材料形成纖維 的芯層。或是使用數種上述光致發光母粒與數種熱塑性材 料來形成具有一層光致發光鞘層、至少一層光致發光芯層 以及至少一層不含光致發光物質之芯層的多層結構之光致 發光纖維。 1293343 其中上述之光致發光物質可為各種光致發光之有機稀 土金屬錯合物，如稀土族金屬偶氮錯合物與稀土族金屬有 機馱錯合物。熱塑性材料可為聚丙稀（pp)、聚酯（ρΕτ)、尼 龍(Nylon)、聚乙烯（Pvc)或聚乙稀醇（ρνΑ)。光致發光物質 與熱塑性材料之混合比例約介於丨〇 至丨〇重量百分比 之間。熔融紡絲之溫度範圍約介於丨3〇 〇c至4〇〇。〇之間。 而在該熔融紡絲過程中亦可添高分子助熔劑（如鄰位乙基 曱苯與％醯胺混合物、對位乙基甲苯與磺醯胺混合物或聚 酉曰可塑劑）以幫助紡絲。此外，上述之改質劑、抗氧化劑或 南分子助熔劑均為本發明相關領域之習知技藝者所熟悉， 並可視需要調整其添加量。 以下提供數個較佳實施例之詳細敘述，以使本發明之 精神與實施方法更為清楚明白。 蓋二:較佳實施例 選擇欲使用之藍色有機稀土金屬錯合物，例如購自台 立國際股份有限公司之編號TL-UV-B商品。此藍色有機稀 土金屬錯合物係為稀土金屬有機酸錯合物，其在波長365 nm之光源激發下會出波長為441 nm之藍色螢光，且化學 分子式如下： (SraMgbBacCadEux)5(P04)3Cl 其中a為〇·5至0.92、b為0至0.02、c為0至0.02、d為 0 至 〇·〇3、X 為 〇·〇8 至 〇·3，而 a + b + c + d+ X = 1。將藍 光之有機稀土金屬錯合物與聚酯以1 ·· 99之重量比例混合 (即含有1 %的有機稀土金屬錯合物）。隨後在約260 °C之 1293343 /m度下進行混練以製備出藍光母粒，此步驟中可添加如低 分子篁聚烯類之改質劑來保護藍光有機稀土金屬錯合物之 發光能力。 隨後以265°C至290°C之溫度分別熔融上述藍光母粒及 聚醋以熔融紡絲，並利用雙螺桿紡絲機進行抽絲，形成芯 鞘比為7 : 3之具有芯鞘結構的光致發光纖維。請參考第1 圖’其為根據此較佳實施例之具有芯鞘結構之光致發光纖 維的示意剖面圖。圖中顯示鞘層1 〇〇包覆住芯層1 〇2，並且 芯層102由1〇〇 %聚酯構成，鞘層1〇〇則由含有1 %藍光之 有機稀土金屬錯合物的聚酯所構成。纖維之截面可為任意 形狀，並不限定為如圖所示之圓形截面。 第二較佳膏施例 選擇一紅色有機稀土金屬錯合物，例如購自台立國際 股份有限公司之編號TL-UV-R商品。此紅色有機稀土金屬 錯合物係為稀土金屬偶氮錯合物之水合物，其在波長365 nm之光源激發下會出波長為615 nm之藍色螢光，且化學 結構式如下：After the Ik, one of the above photoluminescent masterbatch and a thermoplastic material are prepared by a melt spinning method to form a photoluminescent fiber having a core-sheath structure. Where the photoluminescent masterbatch forms a sheath of fibers and the thermoplastic material forms the core layer of the fibers. Or using a plurality of the above-described photoluminescent masterbatch and a plurality of thermoplastic materials to form a multilayer structure having a photoluminescent sheath, at least one photoluminescent core layer, and at least one core layer containing no photoluminescent material Luminescent fiber. 1293343 wherein the photoluminescent material is a photochromic organic rare earth metal complex such as a rare earth metal azo complex and a rare earth metal organic compound. The thermoplastic material may be polypropylene (pp), polyester (ρΕτ), nylon (Nylon), polyethylene (Pvc) or polyethylene glycol (ρνΑ). The mixing ratio of the photoluminescent substance to the thermoplastic material is between about 丨〇 and 丨〇 by weight. The melt spinning temperature ranges from about 〇3〇 〇c to 4〇〇. Between 〇. In the melt spinning process, a polymer flux (such as a mixture of ortho-ethylbenzene and % decylamine, a mixture of para-ethyltoluene and sulfonamide or a polyfluorene plasticizer) may be added to help spin. . Further, the above-mentioned modifier, antioxidant or south molecular fluxing agent are well known to those skilled in the art to which the present invention pertains, and the amount of addition thereof may be adjusted as needed. The detailed description of the preferred embodiments is provided to provide a Cover 2: Preferred Embodiment The blue organic rare earth metal complex to be used is selected, for example, the product number TL-UV-B available from Tai Li International Co., Ltd. The blue organic rare earth metal complex is a rare earth metal organic acid complex which emits blue fluorescence at a wavelength of 441 nm under excitation by a light source having a wavelength of 365 nm, and has the following chemical formula: (SraMgbBacCadEux) 5 ( P04)3Cl wherein a is 〇·5 to 0.92, b is 0 to 0.02, c is 0 to 0.02, d is 0 to 〇·〇3, X is 〇·〇8 to 〇·3, and a + b + c + d+ X = 1. The blue organic rare earth metal complex is mixed with the polyester in a weight ratio of 1 · 99 (i.e., contains 1% of an organic rare earth metal complex). Subsequently, kneading is carried out at about 1293343 /m degree at about 260 ° C to prepare a blue master batch. In this step, a modifier such as a low molecular weight polyene can be added to protect the luminescent ability of the blue organic rare earth metal complex. Subsequently, the above-mentioned blue masterbatch and polyester are respectively melted at a temperature of 265 ° C to 290 ° C to melt-spin, and are subjected to spinning by a twin-screw spinning machine to form a core-sheath structure having a core-sheath ratio of 7:3. Photoluminescent fiber. Please refer to Fig. 1 which is a schematic cross-sectional view of a photo-induced optical fiber having a core-sheath structure according to the preferred embodiment. The figure shows that the sheath 1 〇〇 covers the core layer 1 〇 2, and the core layer 102 is composed of 1% polyester, and the sheath layer 1 is composed of an organic rare earth metal complex containing 1% blue light. Made up of esters. The cross section of the fiber may be any shape, and is not limited to a circular cross section as shown. Second Preferred Paste Example A red organic rare earth metal complex is selected, such as the TL-UV-R product available from Taili International Co., Ltd. The red organic rare earth metal complex is a hydrate of a rare earth metal azo complex, which emits blue fluorescence at a wavelength of 615 nm when excited by a light source having a wavelength of 365 nm, and has the following chemical formula:
1293343 其中Eu代表稀土金屬銪（eur〇pium)，n為氮原子 (nitrogen)，ΑΓ 代表芳香基（aromatic group)。 將上述之紅光有機稀土錯合物與聚丙烯以1:99之重 量比例混合，並在約240°C之溫度下進行混練以製成紅光母 粒。隨後以265°C至290°C之溫度分別將上述紅光母粒及聚 酯熔融以進行熔融紡絲，並利用雙螺桿紡絲機進行抽絲， 形成芯鞘比為8: 2之具有芯鞘結構的光致發光纖維。其中 芯層由100 %聚酯構成，鞘層則由含有i %紅光之有機稀土 金屬錯合物的聚丙烯所構成。 第三較佳實施例 將第一與第二較佳實施例中所使用的紅光與藍光有機 稀土金屬錯合物分別與聚酯以1:99之重量百分比的比例 混合，並在約285 t之溫度下進行混練以製成藍光母粒與 紅光母粒。隨後以265力至29(rC2溫度分別將上述藍光 母粒、紅光母粒及聚丙烯熔融，並利用雙螺桿紡絲機進行 熔融紡絲，形成具有三層芯鞘結構的光致發光纖維。其中 最内部的芯層由100 %聚丙烯構成，中間的芯層由含有1% 紅光之有機稀土金屬錯合物的聚酯所構成，最外層之鞘層 則由含有1 %藍光之有機稀土金屬錯合物的聚酯所構成。 並明參考弟2圖，係利用波長365 nm之紫外光照射第 一較佳實施例與第二較佳實施例所製成的紅光或藍光光致 發光纖維所得到之激發光譜圖。在光譜圖中，一般纖維2〇〇 無產生任何螢光。含有藍光有機稀土金屬錯合物之纖維 12 1293343 出現波長441 nm的螢光。而含有紅光有機稀土金屬錯合物 之纖維204在紫外光的激發下則放出波長615 nm的紅色勞 光0 此外，可利用上述第一至第三較佳實施例中的光致發 光纖維來製造一種防偽產品，例如含有根據上述方法所製 作出之光致發光纖維的防偽紙張（如鈔票、證券）、玩具、裝 飾品或織物等。1293343 wherein Eu represents a rare earth metal ruthenium (eur〇pium), n is a nitrogen atom, and ΑΓ represents an aromatic group. The above red organic rare earth complex was mixed with polypropylene in a weight ratio of 1:99, and kneaded at a temperature of about 240 ° C to prepare a red mother particle. Subsequently, the red masterbatch and the polyester are respectively melted at a temperature of 265 ° C to 290 ° C for melt spinning, and are subjected to spinning by a twin-screw spinning machine to form a core having a core-sheath ratio of 8:2. Photoluminescent fiber of sheath structure. The core layer is composed of 100% polyester, and the sheath layer is composed of polypropylene containing an organic rare earth metal complex of i% red light. The third preferred embodiment mixes the red and blue organic rare earth metal complexes used in the first and second preferred embodiments with the polyester in a ratio of 1:99 by weight, respectively, at about 285 t. The mixing was carried out at a temperature to prepare a blue masterbatch and a red masterbatch. Subsequently, the above-mentioned blue masterbatch, red masterbatch and polypropylene were melted at 265 to 29 (rC2 temperature, respectively, and melt-spun by a twin-screw spinning machine to form a photoluminescent fiber having a three-layer core-sheath structure. The innermost core layer is composed of 100% polypropylene, the middle core layer is composed of polyester containing 1% red light organic rare earth metal complex, and the outermost sheath layer is composed of organic rare earth containing 1% blue light. The metal complex is composed of a polyester. The red or blue photoluminescence produced by the first preferred embodiment and the second preferred embodiment is irradiated with ultraviolet light having a wavelength of 365 nm. The excitation spectrum obtained by the fiber. In the spectrum, generally, the fiber 2〇〇 does not produce any fluorescence. The fiber 12 1293343 containing the blue organic rare earth metal complex exhibits fluorescence at a wavelength of 441 nm, and contains a red organic rare earth. The metal complex compound fiber 204 emits a red work light having a wavelength of 615 nm under the excitation of ultraviolet light. Further, the photoluminescent fiber in the above first to third preferred embodiments can be utilized to manufacture an anti-counterfeiting product, for example, contain According to the process described above to make the security paper luminescence light fibers (e.g., banknotes, securities), toys, jewelry, or fabric like means.
由上述本發明較佳實施例可知，應用本發明具有下列 優點。其一優點在於將光致發光物質混入於纖維中。使纖 維即使經過多次水洗或摩擦，其内的光致發光物質也不易 脫落，達到長效發光之目的。 另一優點在於所使用之光致發光物質在各種熱 料中之發光效果良好、可紡性佳^使得含有光致發光物質 之熱塑性材料在炼融紡絲過程中，即使不添加助劑即可輕 易加工成絲，更可添加助劑來幫助紡絲。此外亦可選擇性 地在熱塑性材料中加人改質劑，如低分子量聚烯類或抗氧 化劑來保護光致發光物質的發光能力，以降低光致發光物 在纖維中的使用比例，達到節省成本之目的。 更有一優點在於光致發光纖維之芯鞠結構的勒層含有 光致發光物質可產生良好的發光效果。更可具有一或一層 以上的芯層’其分別含有不同於鞘層之光致發光物質而具 有不同發光能力，例如-纖維在不同光源照射下鞴層可發 出t光，芯層可發出藍光。亦可使部分芯層不含光致發光 物夤，以降低成本並增加纖維強度。 雖…、本奄明已以一較佳實施例揭露如上，然其並非用 13 1293343 以限定本發明’任何熟習此技藝者，在不脫離本發明之精 神和範圍内，當可作各種之更動與潤飾，因此本發明之保 護範圍當視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 為讓本發明之上述和其他目的、特徵、優點與實施例 能更明顯易懂，所附圖式之詳細說明如下： 第1圖顯示根據本發明一較佳實施例之具有芯鞘結構 之光致發光纖維的示意剖面圖。 第2圖是激發光譜圖，其顯示一般纖維與含有光致發 光物質之纖維在特定波長之光源的激發下放出不同的激發 波長或是不產生任何激發波長。 102 ··芯層 202 ··藍光纖維 【主要元件符號說明】 100 _•鞘層 200 : 一般纖維 204 ··紅光纖維It will be apparent from the above-described preferred embodiments of the present invention that the application of the present invention has the following advantages. One advantage is that the photoluminescent material is incorporated into the fiber. Even if the fiber is washed or rubbed a plurality of times, the photoluminescent substance in the fiber is not easily peeled off, and the purpose of long-lasting light emission is achieved. Another advantage is that the photoluminescent material used has good luminescent effect in various hot materials and good spinnability, so that the thermoplastic material containing the photoluminescent material can be in the process of smelting spinning without adding an auxiliary agent. It is easy to process into silk, and additives can be added to help spinning. In addition, a modifier such as a low molecular weight polyene or an antioxidant may be selectively added to the thermoplastic material to protect the luminescence ability of the photo luminescent material, thereby reducing the proportion of the photo illuminant in the fiber, thereby achieving savings. The purpose of cost. A further advantage is that the layer of the core structure of the photoluminescent fiber contains a photoluminescent substance to produce a good luminescent effect. Further, there may be one or more core layers which respectively contain photoluminescent substances different from the sheath layer and have different light-emitting properties. For example, the fibers may emit t-lights under irradiation of different light sources, and the core layer may emit blue light. Part of the core layer may also be free of photoluminescent materials to reduce cost and increase fiber strength. Although the present invention has been disclosed in a preferred embodiment as described above, it is not intended to limit the invention to those skilled in the art, and various modifications may be made without departing from the spirit and scope of the invention. And the scope of the present invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, advantages and embodiments of the present invention will become more <RTIgt; A schematic cross-sectional view of a photoluminescent fiber having a core-sheath structure. Figure 2 is an excitation spectrum showing that the fibers of the general fiber and the photoluminescent material emit different excitation wavelengths or do not generate any excitation wavelength under the excitation of a light source of a specific wavelength. 102 ··core 202 ··Blue fiber 【Description of main components】 100 _•sheath 200 : general fiber 204 ··red fiber