TWI472655B - Continuous electrostatic spinning apparatus - Google Patents
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本發明是有關於一種電紡設備，且特別是有關於一種滾筒式電紡設備。This invention relates to an electrospinning apparatus, and more particularly to a drum type electrospinning apparatus.
電紡技術為可產生奈米纖維(Nanofibers)製造技術之一，其原理主要是利用正負電極間之電場驅動力，克服高分子之電紡液之表面張力與黏度，使電紡液形成纖細的纖維。習知技術中，係由發射電極施加高電壓於高分子之電紡液，帶電之電紡液經過噴嘴(Spinneret)噴出後，因帶同電性而互相排斥，而分散成絲狀，絲狀的電紡液再經由正負電極間之吸引力，牽引至收集器。電紡液中之溶劑揮發後，即可得極細之電紡纖維(Electrostatic spinning Fibers)。Electrospinning technology is one of the nanofibers manufacturing technologies. The principle is to use the electric field driving force between the positive and negative electrodes to overcome the surface tension and viscosity of the electrospun liquid of the polymer, so that the electrospinning liquid can be slender. fiber. In the prior art, a high voltage is applied to a polymer electrospinning liquid by a transmitting electrode, and the charged electrospinning liquid is ejected through a nozzle (Spinneret), and mutually repels due to the same electric property, and is dispersed into a filament shape and a filament shape. The electrospinning liquid is then drawn to the collector via the attraction between the positive and negative electrodes. After the solvent in the electrospinning solution is volatilized, extremely fine electrospinning fibers (Electrostatic spinning fibers) can be obtained.
相較於傳統紡絲法，電紡技術所紡出的纖維極細，所織成之布料有較高的孔隙度，表面積較大，因而受到青睞。然而，習知電紡技術中，帶電之電紡液多半是利用噴嘴射出至接收器，由於噴嘴之孔徑極細，使用多次後常會因殘存物造成噴嘴或管路阻塞之情形。且在更換不同種類之電紡液時，須配合清洗管路及噴嘴，因而降低了電紡液之使用範圍。Compared with the traditional spinning method, the electrospun technology has a very fine fiber, and the woven fabric has a high porosity and a large surface area, which is favored. However, in the conventional electrospinning technology, most of the charged electrospinning liquid is sprayed to the receiver by the nozzle. Since the nozzle has a very small diameter, the nozzle or the pipeline is often blocked due to the residual material after being used for many times. Moreover, when replacing different types of electrospinning liquid, it is necessary to cooperate with the cleaning pipeline and the nozzle, thereby reducing the use range of the electrospinning liquid.
因此，便出現了採用噴嘴以外之形式進行電紡，以解決噴嘴堵塞的情形。但是，因電紡液使用高分子材料，在經過一段電紡時間之後，有些高分子材料仍會出現纖維糾結的情形，不利於連續電紡。Therefore, electrospinning in the form other than the nozzle has occurred to solve the problem of nozzle clogging. However, due to the use of polymer materials in electrospinning, after a period of electrospinning, some polymer materials still have fiber entanglement, which is not conducive to continuous electrospinning.
因此本發明的目的就是在提供一種連續電紡設備，用以解決在電紡過程中纖維糾結的情形。It is therefore an object of the present invention to provide a continuous electrospinning apparatus for solving the problem of fiber entanglement during electrospinning.
依照本發明一實施例，提出一種連續電紡設備，包含滾筒式發射電極、收集端，以及帶電荷吹風機構。滾筒式發射電極用以發射電紡液以形成電紡纖維。收集端用以接收電紡纖維，收集端包含連接至接地端的接收電極，以及基材。基材接觸接收電極，且位於接收電極與滾筒式發射電極之間。帶電荷吹風機構將帶有電荷之氣流吹向收集端，其中氣流所帶之電性與滾筒式發射電極之電性相反。In accordance with an embodiment of the present invention, a continuous electrospinning apparatus is provided that includes a drum-type emitter electrode, a collection end, and a charged blowing mechanism. A drum type emitter electrode is used to emit an electrospinning liquid to form an electrospun fiber. The collecting end is for receiving the electrospun fiber, the collecting end comprises a receiving electrode connected to the ground end, and the substrate. The substrate contacts the receiving electrode and is located between the receiving electrode and the drum-type emitting electrode. The charged blowing mechanism blows a charged gas stream toward the collecting end, wherein the electrical conductivity of the gas stream is opposite to that of the drum-type emitter electrode.
收集端包含抽氣設備，位於基材一側。接收電極位於抽氣設備內。帶電荷吹風機構至基材之間的垂直距離大於滾筒式發射電極至基材之間的垂直距離，且帶電荷吹風機構至滾筒式發射電極之間的垂直距離大於基材至滾筒式發射電極之間的垂直距離。帶電荷吹風機構之出風口與基材間之夾角為0到60度。基材可為絕緣多孔性承接網、織物或是其組合。帶電荷吹風機構包含吹風裝置以及設置於吹風裝置前端之電荷供應源。滾筒式發射電極包含進料槽、於進料槽中滾動之滾筒，以及接觸滾筒之線電極。滾筒式發射電極更包含高壓電源，連接線電極。The collection end contains a suction device located on the side of the substrate. The receiving electrode is located in the pumping device. The vertical distance between the charged blowing mechanism and the substrate is greater than the vertical distance between the drum-type emitter electrode and the substrate, and the vertical distance between the charged blowing mechanism and the drum-type emitter electrode is greater than the substrate-to-drum emitter electrode The vertical distance between them. The angle between the air outlet of the charged air blowing mechanism and the substrate is 0 to 60 degrees. The substrate can be an insulating porous web, a fabric, or a combination thereof. The charged blowing mechanism includes a blowing device and a charge supply source disposed at the front end of the blowing device. The drum type emitter electrode includes a feed tank, a drum that rolls in the feed tank, and a wire electrode that contacts the drum. The drum type emitter electrode further comprises a high voltage power source and a wire electrode.
連續電紡設備透過帶電荷吹風機構，將帶有電荷之氣流吹向收集端，以中和電紡纖維所帶之電性，提升收集端的吸附力，使得電紡纖維可以平整且均勻地吸附在基材上，有效解決電紡纖維糾結的問題。The continuous electrospinning device blows a charged airflow to the collecting end through a charged blowing mechanism to neutralize the electrical properties of the electrospun fiber and enhance the adsorption force at the collecting end, so that the electrospun fiber can be uniformly and evenly adsorbed. On the substrate, the problem of entanglement of electrospun fibers is effectively solved.
以下將以圖式及詳細說明清楚說明本發明之精神，任何所屬技術領域中具有通常知識者在瞭解本發明之較佳實施例後，當可由本發明所教示之技術，加以改變及修飾，其並不脫離本發明之精神與範圍。The spirit and scope of the present invention will be apparent from the following description of the preferred embodiments of the invention. The spirit and scope of the invention are not departed.
本發明之連續電紡設備主要是應用在滾筒式發射電極的電紡設備中，滾筒式發射電極包含有進料滾筒與線電極，進料滾筒上之電紡液沾附到線電極上之後，帶有高壓電的線電極將電紡液噴射為電紡纖維，再由收集端收集此些電紡纖維。然而，有時會發現在使用特定的高分子溶液作為電紡液時，會有明顯的纖維糾結的情形。本發明的連續電紡設備便是用以解決因纖維糾結而使得連續電紡無法實現的問題。The continuous electrospinning device of the present invention is mainly applied to an electrospinning device of a drum type emitter electrode. The drum type emitter electrode comprises a feeding roller and a wire electrode, and after the electrospinning liquid on the feeding roller is attached to the wire electrode, The wire electrode with high voltage electricity ejects the electrospinning liquid into electrospun fibers, and the electrospun fibers are collected by the collecting end. However, it has sometimes been found that when a specific polymer solution is used as the electrospinning liquid, there is a case where the fiber is entangled. The continuous electrospinning apparatus of the present invention solves the problem that continuous electrospinning cannot be achieved due to fiber entanglement.
發明人發現纖維糾結的原因來自於電紡纖維無法順利地貼附在收集端，若是電紡纖維無法貼附在收集端上，便會有纖維糾結的情形發生，導致發射電極與接收端之間出現成團的電紡纖維，嚴重時，甚至會直接中斷線電極的噴發。The inventors found that the cause of fiber entanglement comes from the fact that the electrospun fiber cannot be attached to the collecting end smoothly. If the electrospun fiber cannot be attached to the collecting end, the fiber entanglement occurs, resulting in a gap between the transmitting electrode and the receiving end. In the case of agglomerated electrospun fibers, the eruption of the wire electrode is directly interrupted.
如第1圖所示，收集端包含有導體材料的接收電極110與其上的基材112，接收電極110會因感應起電而與發射電極120帶相異電荷，藉以吸引電紡纖維130，而電紡纖維130會同樣因為感應起電的原理，而帶有電性排列。舉例而言，圖中之線狀的發射電極120帶有正高壓電，而連向接地端之接收電極110會因感應起電的因素帶有負電，電紡纖維130同樣因感應起電使得內部呈正負電性排列，電紡纖維130較接近發射電極120之一端帶負電，較接近接收電極110之一端帶正電。隨著收集端所累積的電紡纖維130越來越多，接收電極110所能提供的吸引力亦逐漸減少，導致吸附力降低。因此，後來的電紡纖維130受到接收電極110的吸引力降低，而相對受到發射電極120的牽引力影響變大，使得電紡纖維130帶負電之一端受到發射電極120之正電吸引，產生逆向的牽引力導致電紡纖維130無法順利吸附於接收端。發明人認為此為造成電紡纖維130糾結的可能原因之一。As shown in FIG. 1, the collecting end includes a receiving electrode 110 of a conductor material and a substrate 112 thereon, and the receiving electrode 110 is charged differently from the transmitting electrode 120 by induction charging, thereby attracting the electrospun fiber 130. The electrospun fiber 130 will also be electrically aligned due to the principle of induced electrification. For example, the linear emitter electrode 120 in the figure has a positive high voltage, and the receiving electrode 110 connected to the ground terminal is negatively charged due to the induced electrification. The electrospun fiber 130 is also internally induced by induction. In a positive and negative electrical arrangement, the electrospun fiber 130 is negatively charged closer to one end of the emitter electrode 120 and is positively charged closer to one end of the receiving electrode 110. As more and more electrospun fibers 130 accumulate at the collecting end, the attractive force that the receiving electrode 110 can provide is gradually reduced, resulting in a decrease in the adsorption force. Therefore, the later electrospun fiber 130 is reduced in the attractive force of the receiving electrode 110, and is relatively affected by the traction force of the transmitting electrode 120, so that one end of the negatively charged portion of the electrospun fiber 130 is positively attracted by the transmitting electrode 120, resulting in a reverse The traction causes the electrospun fiber 130 to be unable to be smoothly absorbed at the receiving end. The inventors believe that this is one of the possible reasons for the entanglement of the electrospun fiber 130.
此外，由於發射電極120所帶之電荷會大量地往周圍游離，發明人認為此些游離的電荷可能也是造成電紡纖維糾結的另一因素。經過實地量測電壓值之後，發現當發射電極120帶40kV的正電壓時，電紡纖維130約帶有11.39kV的正電壓；當發射電極120帶40kV的負電壓時，電紡纖維130約帶有12kV的負電壓。In addition, since the charge carried by the emitter electrode 120 is largely released to the surroundings, the inventors believe that such free charges may also be another factor contributing to the entanglement of the electrospun fibers. After measuring the voltage value in the field, it is found that when the emitter electrode 120 has a positive voltage of 40 kV, the electrospun fiber 130 has a positive voltage of about 11.39 kV; when the emitter electrode 120 has a negative voltage of 40 kV, the electrospun fiber 130 is about There is a negative voltage of 12kV.
於是，本案發明人便提出了一種構想，利用帶電荷吹風機構，將帶有與發射電極120相異電荷的氣流吹向收集端，以中和電紡纖維130所帶之電荷，以及提升收集端的牽引力，進而解決電紡纖維130糾結的問題。Thus, the inventor of the present invention has proposed an idea of using a charged blowing mechanism to blow a gas stream having an opposite charge to the emitter electrode 120 toward the collecting end to neutralize the charge carried by the electrospun fiber 130 and to raise the collecting end. The traction force further solves the problem of entanglement of the electrospun fiber 130.
再如第1圖所示，發射電極120與接收電極110之間包含有電紡液的錐形噴射(cone jet)區段a以及電紡纖維成形區段b。其中錐形噴射區段a為線狀的發射電極120通上高壓電使得其上之電紡液產生錐形噴射的區段，而電紡纖維成形區段b則是電紡液延伸開並使其中之溶劑揮發形成電紡纖維130的區段。由於錐形噴射區段a與電紡纖維成形區段b之間的比例的決定因素在於不同特性的高分子電紡液，而非製程參數，因此相同的電紡液在固定收集距離下，錐形噴射區段a與電紡纖維成形區段b的長度固定。Further, as shown in Fig. 1, a cone jet section a of the electrospinning liquid and an electrospun fiber forming section b are contained between the emitter electrode 120 and the receiving electrode 110. Wherein the tapered spray section a is a linear emitter electrode 120 which is electrically connected to the electrospinning liquid to produce a cone-shaped section, and the electrospun fiber forming section b is an electrospinning solution The solvent therein is volatilized to form a section of the electrospun fiber 130. Since the ratio between the ratio of the tapered spray section a to the electrospun fiber-forming section b is determined by the polymer electrospinning liquid of different characteristics, not the process parameters, the same electrospinning liquid is at a fixed collection distance, and the cone The jet section a is fixed to the length of the electrospun fiber forming section b.
由於電紡纖維130在電紡纖維成形區段b完成，而電紡纖維無法貼附的問題也在此區末端發生。因此前述之發明人電荷中和的構想要控制在電紡纖維成形區段b的末端，而且不能影響電紡纖維130成形。Since the electrospun fiber 130 is completed in the electrospun fiber forming section b, the problem that the electrospun fiber cannot be attached also occurs at the end of this zone. Therefore, the aforementioned charge neutralizing structure of the inventors is intended to be controlled at the end of the electrospun fiber forming section b, and does not affect the formation of the electrospun fiber 130.
參照第2圖，其繪示本發明之連續電紡設備之一實施例的示意圖。連續電紡設備200包含滾筒式發射電極210、收集端220以及帶電荷吹風機構230。滾筒式發射電極210用以發射電紡液以形成電紡纖維240，其包含有進料槽212、於進料槽212中滾動的滾筒214、接觸滾筒214用以沾附並噴射電紡液的線電極216，以及連接至線電極216的高壓電源218，其中線電極216之材料為導體。滾筒214可以為絕緣材料或是非絕緣材料。Referring to Figure 2, there is shown a schematic diagram of one embodiment of a continuous electrospinning apparatus of the present invention. The continuous electrospinning apparatus 200 includes a drum type emitter electrode 210, a collection end 220, and a charged blowing mechanism 230. The drum type emitter electrode 210 is used to emit electrospinning liquid to form an electrospun fiber 240, which comprises a feeding trough 212, a roller 214 rolling in the feeding trough 212, and a contact roller 214 for adhering and ejecting the electrospinning liquid. The wire electrode 216, and the high voltage power source 218 connected to the wire electrode 216, wherein the material of the wire electrode 216 is a conductor. The roller 214 can be an insulating material or a non-insulating material.
收集端220用以接收電紡纖維240，收集端220包含有接收電極222以及基材224。接收電極222之材料為導體，接收電極222連接至接地端226，接收電極222可以為金屬滾輪或是金屬平板。線電極216接上高壓電源218之後，與接地端226連接之導體材料的接收電極222會因感應起電的原理，而帶有與線電極216相反的電性，舉例而言，若是線電極216接上正高壓電，則接收電極222因感應起電呈負電性，反之亦然。The collection end 220 is for receiving the electrospun fiber 240, and the collection end 220 includes a receiving electrode 222 and a substrate 224. The receiving electrode 222 is made of a conductor, the receiving electrode 222 is connected to the grounding end 226, and the receiving electrode 222 can be a metal roller or a metal flat plate. After the wire electrode 216 is connected to the high voltage power supply 218, the receiving electrode 222 of the conductor material connected to the grounding end 226 is electrically opposite to the wire electrode 216 due to the principle of induced electrification. For example, if the wire electrode 216 is When the positive high voltage is connected, the receiving electrode 222 is negatively charged due to the induced electrification, and vice versa.
基材224設置於接收電極222一側，面對滾筒式發射電極210。基材224為絕緣材料，用以收集電紡纖維240。基材224可以是絕緣多孔性承接網或是織物。電紡纖維240附著在基材224上。或者，基材224可以是絕緣多孔性承接網與織物之組合。由於基材224為絕緣材料，容易累積電荷，以至於排斥電紡纖維240無法順利收集。因此，在設計時，基材224可以與金屬的接收電極222接觸，藉由接收電極222將基材224上的電荷帶離，避免基材224上的電荷累積降低電紡纖維240的吸附力。The substrate 224 is disposed on the side of the receiving electrode 222 facing the drum-type emitter electrode 210. Substrate 224 is an insulating material for collecting electrospun fibers 240. Substrate 224 can be an insulating porous web or fabric. Electrospun fiber 240 is attached to substrate 224. Alternatively, substrate 224 can be a combination of an insulating porous web and a fabric. Since the substrate 224 is an insulating material, it is easy to accumulate electric charges, so that the electrospun fibers 240 are not collected smoothly. Therefore, at the time of design, the substrate 224 can be in contact with the metal receiving electrode 222, and the charge on the substrate 224 can be removed by the receiving electrode 222, thereby preventing the charge accumulation on the substrate 224 from reducing the adsorption force of the electrospun fiber 240.
收集端220更選擇性地包含有抽氣設備228。抽氣設備228位於基材224一側，抽氣設備228包含有箱體227以及與箱體227連接的抽氣管229。接收電極222位於抽氣設備228之箱體227內。藉由抽氣設備228可以進一步提升收集端220收集電紡纖維240的能力。The collection end 220 more selectively includes an extraction device 228. The pumping device 228 is located on the side of the substrate 224, and the pumping device 228 includes a tank 227 and an exhaust pipe 229 connected to the tank 227. The receiving electrode 222 is located within the housing 227 of the pumping device 228. The ability of the collection end 220 to collect the electrospun fibers 240 can be further enhanced by the pumping device 228.
帶電荷吹風機構230用以提供帶有電荷的氣流，並將帶有電荷的氣流吹向接收電極222。其中氣流所帶的電性與滾筒式發射電極210中之線電極216的電性相反，即若是線電極216接上正高壓電，則帶電荷吹風機構230提供帶有負電荷的氣流，反之亦然。帶電荷吹風機構230包含有吹風裝置232以及設置於吹風裝置232前端的電荷供應源234。The charged blowing mechanism 230 is used to provide a charged gas stream and to blow a charged gas stream toward the receiving electrode 222. The electrical conductivity of the airflow is opposite to the electrical polarity of the wire electrode 216 in the drum-type emitter electrode 210. That is, if the wire electrode 216 is connected to a positive high voltage, the charged air-blowing mechanism 230 provides a negatively charged airflow, and vice versa. Of course. The charged blowing mechanism 230 includes a blowing device 232 and a charge supply source 234 disposed at the front end of the blowing device 232.
如前所述，電荷中和的目標需要設定在電紡纖維成形區段b的末段(見第1圖)，此帶有電荷的氣流不能影響電紡纖維240的成形。另外，帶電荷吹風機構230的設置位置需要加以限制，使得同樣帶有電荷，尤其是與線電極216帶相同電性的電紡纖維240不會受到帶電荷吹風機構230的牽引而直接往帶電荷吹風機構230移動。As previously mentioned, the target of charge neutralization needs to be set at the end of the electrospun fiber forming section b (see Figure 1), and this charged gas flow cannot affect the formation of the electrospun fiber 240. In addition, the position of the charged blowing mechanism 230 needs to be limited so that the electrospun fiber 240, which is also charged, especially the same electrical property as the wire electrode 216, is not directly drawn by the charged blowing mechanism 230. The blowing mechanism 230 moves.
具體而言，帶電荷吹風機構230至基材224之間的垂直距離大於滾筒式發射電極210至基材224之間的垂直距離，且帶電荷吹風機構230至滾筒式發射電極210之間的垂直距離亦大於基材224至滾筒式發射電極210之間的垂直距離。換言之，滾筒式發射電極210位於帶電荷吹風機構230與收集端220之間，且帶電荷吹風機構230相對遠離滾筒式發射電極210與基材224。Specifically, the vertical distance between the charged blowing mechanism 230 to the substrate 224 is greater than the vertical distance between the drum-type emitter electrode 210 to the substrate 224, and the vertical between the charged blowing mechanism 230 to the drum-type emitter electrode 210 The distance is also greater than the vertical distance between the substrate 224 and the roller emitter electrode 210. In other words, the drum-type emitter electrode 210 is located between the charged blowing mechanism 230 and the collection end 220, and the charged blowing mechanism 230 is relatively far from the drum-type emitter electrode 210 and the substrate 224.
帶電荷吹風機構230之風速、角度、風量、溫度大致上無特別限制，只要能使帶有電荷的氣流吹送至收集端220或是電紡纖維成形區段的末段而不影響電紡纖維240成形即可，其中帶電荷吹風機構230之出風口與基材224間之夾角θ較佳地為0到60度。前述之夾角θ尤其是指帶電荷吹風機構230之出風口的法線與基材224之長軸的夾角。The wind speed, angle, air volume, and temperature of the charged air blowing mechanism 230 are not particularly limited as long as the charged air stream can be blown to the collecting end 220 or the end of the electrospun fiber forming section without affecting the electrospun fiber 240. The forming may be such that the angle θ between the air outlet of the charged blowing mechanism 230 and the substrate 224 is preferably 0 to 60 degrees. The aforementioned angle θ refers in particular to the angle between the normal of the air outlet of the charged air blowing mechanism 230 and the long axis of the substrate 224.
帶電荷吹風機構230所提供的風力，其目的非用以控制電紡纖維的收集方向，而是在於提供帶有電荷的氣流至預定位置，如收集端220前方之電紡纖維成形區段的末段位置。經由帶電荷吹風機構230所提供之吹向收集端220的帶有電荷的氣流，可以中和電紡纖維240所帶之電性，並強化收集端220的吸附能力，使得電紡纖維240平整地收集在基材224上。此外，帶電荷吹風機構230所提供的氣流可以為熱風，其可進一步提升溶劑揮發量，提升電紡纖維240的質量。The wind provided by the charged blowing mechanism 230 is not intended to control the collection direction of the electrospun fibers, but rather to provide a charged gas stream to a predetermined position, such as the end of the electrospun fiber forming section in front of the collecting end 220. Segment location. The electrically charged gas stream supplied to the collecting end 220 via the charged blowing mechanism 230 can neutralize the electrical properties of the electrospun fiber 240 and enhance the adsorption capacity of the collecting end 220, so that the electrospun fiber 240 is flat. Collected on substrate 224. In addition, the airflow provided by the charged blowing mechanism 230 may be hot air, which may further increase the amount of solvent evaporation and improve the quality of the electrospun fiber 240.
第3A圖為未使用帶電荷吹風機構之電紡設備的電紡纖維照片及纖維分布圖。第3B圖與第3C圖分別為使用帶電荷吹風裝置之電紡設備於不同風速下的電紡纖維照片及纖維分布圖。本次實驗是以PVDF作為電紡液，收集距離為13公分，操作電壓-45kV，帶電荷吹風機構之出風口與基材間之夾角為60度。由照片可以得知，使用帶電荷吹風機構後，不論風速多少，均可以有效減少電紡纖維糾結的情形，並有效提升電紡纖維的均勻性，使得電紡纖維可以平整地貼附在基材上。Figure 3A is a photograph of an electrospun fiber and a fiber distribution of an electrospinning apparatus that does not use a charged blowing mechanism. Figures 3B and 3C are photographs and fiber profiles of electrospun fibers at different wind speeds using an electrospinning device with a charged blowing device, respectively. In this experiment, PVDF was used as the electrospinning liquid, the collection distance was 13 cm, the operating voltage was -45 kV, and the angle between the air outlet of the charged air blowing mechanism and the substrate was 60 degrees. It can be known from the photos that after using the charged blowing mechanism, regardless of the wind speed, the entanglement of the electrospun fiber can be effectively reduced, and the uniformity of the electrospun fiber can be effectively improved, so that the electrospun fiber can be attached to the substrate flatly. on.
第4A圖為未使用帶電荷吹風機構之電紡設備的電紡纖維照片及實驗結果。第4B圖與第4C圖分別為使用帶電荷吹風裝置之電紡設備於不同操作時間後的電紡纖維照片及實驗結果。本次實驗是以PVDF作為電紡液，收集距離為13公分，操作電壓-45kV，基材為絕緣多孔性承接網與織物的組合，電紡纖維附著於織物上。帶電荷吹風機構之出風口與基材間之夾角為60度，帶電荷吹風機構之出口風速為5.03m/s，所提供的電壓為+30kV。Figure 4A is a photograph of the electrospun fiber and experimental results of an electrospinning apparatus that does not use a charged blowing mechanism. Figures 4B and 4C are photographs and experimental results of electrospun fibers after different operating times using an electrospinning device with a charged blowing device, respectively. In this experiment, PVDF was used as the electrospinning liquid, the collection distance was 13 cm, the operating voltage was -45 kV, the substrate was a combination of insulating porous mesh and fabric, and the electrospun fibers were attached to the fabric. The angle between the air outlet of the charged air blowing mechanism and the substrate is 60 degrees, the exit wind speed of the charged air blowing mechanism is 5.03 m/s, and the voltage supplied is +30 kV.
第4A圖之實驗例中，由於未使用帶電荷吹風機構，除了明顯地出現電紡纖維糾結的情形之外，電紡纖維的均勻度亦不理想，成品的濾效偏低。除此之外，此實驗例在開始十秒鐘之後，便因電紡纖維糾結的情形十分嚴重影響電紡液噴發而無法繼續進行電紡。In the experimental example of Fig. 4A, since the charged blowing mechanism was not used, in addition to the case where the electrospun fiber entanglement was apparent, the uniformity of the electrospun fiber was not satisfactory, and the filtration efficiency of the finished product was low. In addition, after the first ten seconds of this experimental example, the entanglement of the electrospun fibers seriously affected the electrospinning eruption and could not continue electrospinning.
第4B圖為使用帶電荷吹風機構之電紡設備在運作10秒中之後的結果。從照片中可以得知，加上帶電荷吹風機構之後，電紡纖維無明顯糾結的情形發生，且電紡纖維的均勻度與成品的濾效均大幅提升。Figure 4B is the result of an electrospinning device using a charged blowing mechanism after 10 seconds of operation. It can be known from the photos that after the charged blowing mechanism, the electrospun fiber has no obvious entanglement, and the uniformity of the electrospun fiber and the filter efficiency of the finished product are greatly improved.
第4C圖則是使用帶電荷吹風機構之電紡設備在運作一個小時之後的結果。從實驗結果證明，採用帶電荷吹風機構之後，電紡設備可以實現連續電紡，並且在經過一個小時的電紡之後，所產生的電紡纖維仍然均勻且無明顯糾結，證實了將帶有電荷的氣流吹向收集端，以中和電紡纖維之電性或是提升收集端的吸附力，確實可以有效解決電紡纖維糾結的問題，並提升電紡纖維的均勻度。Figure 4C is the result of one hour of operation using an electrospinning device with a charged blowing mechanism. It is proved from the experimental results that after the charged blowing mechanism, the electrospinning equipment can realize continuous electrospinning, and after one hour of electrospinning, the produced electrospun fibers are still uniform and have no obvious entanglement, confirming that there will be electric charges. The airflow is blown toward the collecting end to neutralize the electrical properties of the electrospun fiber or to enhance the adsorption force at the collecting end, which can effectively solve the problem of entanglement of the electrospun fiber and improve the uniformity of the electrospun fiber.
使用帶電荷吹風機構與未使用帶電荷吹風機構之電紡設備的實驗結果具體的比較如下表所示：A detailed comparison of experimental results using a charged blowing mechanism with an electrospinning device that does not use a charged blowing mechanism is shown in the following table:
實驗結果說明在本發明的機構設計下，顯著改善了電紡纖維收集情形，原先無法平整貼附的電紡纖維都能順利貼附，原本不到10秒就糾結的現象得到大幅改善，可以連續生產1小時以上都不會產生糾結。且分析所收集的電紡纖維膜基重，其基重不均勻度由原來的60%降至10%以下。The experimental results show that under the mechanism design of the present invention, the collection condition of the electrospun fiber is remarkably improved, and the electrospun fiber which can not be flattened and attached can be smoothly attached, and the phenomenon of entanglement in the original less than 10 seconds is greatly improved and can be continuously Production for more than 1 hour will not cause entanglement. And the basis weight of the collected electrospun fiber membrane was analyzed, and the basis weight unevenness was reduced from 60% to less than 10%.
由上述本發明較佳實施例可知，應用本發明具有下列優點。連續電紡設備透過帶電荷吹風機構，將帶有電荷之氣流吹向收集端，以中和電紡纖維所帶之電性，提升收集端的吸附力，使得電紡纖維可以平整且均勻地吸附在基材上，有效解決電紡纖維糾結的問題。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. The continuous electrospinning device blows a charged airflow to the collecting end through a charged blowing mechanism to neutralize the electrical properties of the electrospun fiber and enhance the adsorption force at the collecting end, so that the electrospun fiber can be uniformly and evenly adsorbed. On the substrate, the problem of entanglement of electrospun fibers is effectively solved.
雖然本發明已以一較佳實施例揭露如上，然其並非用以限定本發明，任何熟習此技藝者，在不脫離本發明之精神和範圍內，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。Although the present invention has been described above in terms of a preferred embodiment, it is not intended to limit the invention, and it is obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.
110．．．接收電極110. . . Receiving electrode
112．．．基材112. . . Substrate
120．．．發射電極120. . . Transmitting electrode
130．．．電紡纖維130. . . Electrospun fiber
200．．．連續電紡設備200. . . Continuous electrospinning equipment
210．．．滾筒式發射電極210. . . Roller type emitter electrode
212．．．進料槽212. . . Feed trough
214．．．滾筒214. . . roller
216．．．線電極216. . . Wire electrode
218．．．高壓電源218. . . High voltage power supply
220．．．收集端220. . . Collecting end
222．．．接收電極222. . . Receiving electrode
224．．．基材224. . . Substrate
226．．．接地端226. . . Ground terminal
227．．．箱體227. . . Box
228．．．抽氣設備228. . . Pumping equipment
229．．．抽氣管229. . . Exhaust pipe
230．．．帶電荷吹風機構230. . . Charged blowing mechanism
232．．．吹風裝置232. . . Blowing device
234．．．電荷供應源234. . . Charge supply source
240．．．電紡纖維240. . . Electrospun fiber
a．．．錐形噴射區段a. . . Conical jet section
b．．．電紡纖維成形區段b. . . Electrospun fiber forming section
θ．．．夾角θ. . . Angle
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：The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood.
第1圖為一種電紡設備的示意圖。Figure 1 is a schematic illustration of an electrospinning device.
第2圖繪示本發明之連續電紡設備之一實施例的示意圖。Figure 2 is a schematic illustration of one embodiment of a continuous electrospinning apparatus of the present invention.
第3A圖為未使用帶電荷吹風機構之電紡設備的電紡纖維照片及纖維分布圖。Figure 3A is a photograph of an electrospun fiber and a fiber distribution of an electrospinning apparatus that does not use a charged blowing mechanism.
第3B圖與第3C圖分別為使用帶電荷吹風裝置之電紡設備於不同風速下的電紡纖維照片及纖維分布圖。Figures 3B and 3C are photographs and fiber profiles of electrospun fibers at different wind speeds using an electrospinning device with a charged blowing device, respectively.
第4A圖為未使用帶電荷吹風機構之電紡設備的電紡纖維照片及實驗結果。Figure 4A is a photograph of the electrospun fiber and experimental results of an electrospinning apparatus that does not use a charged blowing mechanism.
第4B圖與第4C圖分別為使用帶電荷吹風裝置之電紡設備於不同操作時間後的電紡纖維照片及實驗結果。Figures 4B and 4C are photographs and experimental results of electrospun fibers after different operating times using an electrospinning device with a charged blowing device, respectively.
200．．．連續電紡設備200. . . Continuous electrospinning equipment
210．．．滾筒式發射電極210. . . Roller type emitter electrode
212．．．進料槽212. . . Feed trough
214．．．滾筒214. . . roller
216．．．線電極216. . . Wire electrode
218．．．高壓電源218. . . High voltage power supply
220．．．收集端220. . . Collecting end
222．．．接收電極222. . . Receiving electrode
224．．．基材224. . . Substrate
226．．．接地端226. . . Ground terminal
227．．．箱體227. . . Box
228．．．抽氣設備228. . . Pumping equipment
229．．．抽氣管229. . . Exhaust pipe
230．．．帶電荷吹風機構230. . . Charged blowing mechanism
232．．．吹風裝置232. . . Blowing device
234．．．電荷供應源234. . . Charge supply source
240．．．電紡纖維240. . . Electrospun fiber
θ．．．夾角θ. . . Angle
Claims (10)
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| JP2005264374A (en) * | 2004-03-18 | 2005-09-29 | Japan Vilene Co Ltd | Method and apparatus for producing fiber assembly by electrostatic spinning method |
| TW201100598A (en) * | 2009-06-19 | 2011-01-01 | Taiwan Textile Res Inst | Roller type electrostatic spinning apparatus |
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| JP2005264374A (en) * | 2004-03-18 | 2005-09-29 | Japan Vilene Co Ltd | Method and apparatus for producing fiber assembly by electrostatic spinning method |
| TW201100598A (en) * | 2009-06-19 | 2011-01-01 | Taiwan Textile Res Inst | Roller type electrostatic spinning apparatus |
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