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    • 78. 发明申请
    • Methods for making fiber reinforced polypropylene composites using pre-cut fiber
    • 使用预切纤维制造纤维增强聚丙烯复合材料的方法
    • US20080237914A1
    • 2008-10-02
    • US12079340
    • 2008-03-26
    • Arnold LustigerJennifer Harting WardPatrick BormannDavid Jon StarzAlan J. Oshinski
    • Arnold LustigerJennifer Harting WardPatrick BormannDavid Jon StarzAlan J. Oshinski
    • B29B9/06B29C47/60
    • C08F255/02B29C48/39B29C48/535B29C48/57C08J3/201C08J5/046C08J5/047C08J2323/10C08K3/01C08K5/00C08L23/10C08L23/12C08L33/20C08L51/06C08L67/00C08L2205/16C08L2666/20C08L2666/06C08L2666/02C08L2666/18C08L2666/14C08L2666/04
    • The present disclosure is directed generally to methods for making fiber reinforced polypropylene composite pellets using pre-cut fiber fed to a compounding extruder by improved fiber feeder systems. One form of the method includes feeding into a compounding extruder at least 25 wt % polypropylene based polymer, from 5 to 60 wt % pre-cut organic fiber, and from 0 to 60 wt % inorganic filler; and extruding, cooling and pelletizing the resultant mixture of components to form fiber reinforced polypropylene composite pellets; wherein the pre-cut organic fiber is fed from a feeder including a feeder hopper, one or more conditioning augers/agitators, one or more metering augers below the feeder hopper, and a means for controlling the speed of the conditioning augers/agitators and metering augers; and wherein an article molded from the pellets has a flexural modulus of at least 2.07 GPa and exhibits ductility during instrumented impact testing. In another form, the feeder includes a feeder hopper, two or more counter-rotating metering rollers, one or more separating rollers below the metering rollers, and a means for controlling the speed of the metering rollers and separating rollers. In yet another form, a circle feeder may be used to feed the pre-cut fiber.
    • 本公开一般涉及使用通过改进的纤维馈送系统进料到配混挤出机的预切纤维来制备纤维增强聚丙烯复合颗粒的方法。 该方法的一种形式包括将至少25重量%的聚丙烯基聚合物,5至60重量%的预切割有机纤维和0至60重量%的无机填料进料到配混挤出机中; 挤出,冷却和造粒所得的组分混合物以形成纤维增强聚丙烯复合颗粒; 其中预切的有机纤维从包括进料器料斗,一个或多个调理螺旋推运器/搅拌器,在进料斗下方的一个或多个计量螺旋推运器的进料器进给,以及用于控制调节螺旋推料器/搅拌器和计量的速度的装置 螺旋钻 并且其中由颗粒模制的制品具有至少2.07GPa的弯曲模量并且在仪表式冲击试验期间具有延展性。 在另一种形式中,进料器包括进料斗,两个或多个反向旋转计量辊,计量辊下方的一个或多个分离辊,以及用于控制计量辊和分离辊的速度的装置。 在另一种形式中,可以使用圆形进给器来进给预切割的纤维。