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1. 发明授权

US5370911A Method of depositing and fusing charged polymer particles on continuous filaments 失效
标题翻译：将带电聚合物颗粒沉积并固定在连续长丝上的方法
公开(公告)号：US5370911A
公开(公告)日：1994-12-06
申请号：US511574
申请日：1990-04-20
申请人： James L. Throne , Andrea L. Ogden
发明人： James L. Throne , Andrea L. Ogden
IPC分类号： B05B7/14 , B05D1/06 , B05D7/20 , B29B15/12
CPC分类号： B05B7/1404 , B05B7/1472 , B05D1/06 , B05D7/20 , B29B15/12 , B29K2079/085 , B29K2105/251
摘要： Process for making a tow pre-preg (or tow-preg) comprising long continuous fibers coated with a thermoplastic polymer. A spread tow of long continuous fibers, preferably carbon or glass, is grounded and coated with electrostatically charged particles. The fiber diameter is about 5-50 microns and the mean particle diameter is about 0.1-40 microns. A particle laden air stream is formed by aspirating fluidized polymer particles into a flowing air stream whose velocity exceeds the settling velocity of the particles. The particles in the flowing air stream are continuously electrostatically charged by means of an applied voltage of at least about 20 kV. The flowing air stream with electrostatically charged particles suspended therein is then contacted with the continuously moving grounded spread fiber tow. The particle laden air stream is flowing downwardly and the fiber tow moving horizontally at the time of contact. The fibers with thermoplastic particles clinging thereto are continuously heated to a temperature sufficient to cause fusion of the thermoplastic polymer. This results in long continuous fibers coated with the thermoplastic polymer. The resulting tow-preg, or tow of coated fibers, is useful in the preparation of structural composites in which the fibers service reinforcing fibers. The thermoplastic coating polymer is a high performance polymer, such as thermoplastic polyimide (TPI), where high performance and the structural composite is desired. Polymer coating weights may vary from about 20% to about 90% of the total tow-preg weight.
摘要翻译：用于制造包含涂覆有热塑性聚合物的长连续纤维的丝束预浸（或丝束预浸）的方法。长连续纤维，优选碳或玻璃的蔓延丝束接地并涂覆静电带电粒子。纤维直径约5-50微米，平均粒径约为0.1-40微米。通过将流化聚合物颗粒吸入流速超过颗粒沉降速度的流动空气流中形成载满颗粒的空气流。流动空气流中的颗粒通过至少约20kV的施加电压连续地静电充电。然后将静电带电颗粒悬浮在其中的流动空气流与连续移动的接地扩展纤维束接触。载满颗粒的空气流向下流动，纤维束在接触时水平移动。具有粘附在其上的热塑性颗粒的纤维被连续加热到足以引起热塑性聚合物熔化的温度。这导致涂覆有热塑性聚合物的长连续纤维。所得到的丝束纤维或丝束的涂覆纤维可用于制备纤维用于增强纤维的结构复合材料。热塑性涂料聚合物是高性能聚合物，例如热塑性聚酰亚胺（TPI），其中需要高性能和结构复合材料。聚合物涂层重量可以在总牵引重量的约20％至约90％之间变化。

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