Edge directors including an interior heating device

An apparatus can include a wedge including a pair of inclined surface portions converging along a downstream direction to form a root of the wedge. The apparatus can further include an edge director intersecting with at least one of the pair of inclined surface portions. The edge director can include an interior cavity. In some embodiments, the apparatus can further include a heating device positioned within the interior cavity, wherein the heating device can include a plurality of heating segments. In further embodiments, the apparatus can further include a plurality of coils of wire positioned within the interior cavity, wherein each of the plurality of coils of wire can include windings that may be wound about a corresponding linear coil axis that extends in the downstream direction. 设备可以包括楔，所述楔包括一对倾斜表面部分，它们沿着下游方面会聚以形成楔的根部。设备还可以包括与所述一对向下倾斜的表面部分中的至少一个相交的边缘引导件。边缘引导件可以包括内腔体。在一些实施方式中，设备还可以包括位于内腔体中的加热装置，其中，加热装置可以包括多个加热段。在其他实施方式中，设备还可以包括位于内腔体中的多个丝线线圈，其中，所述多个丝线线圈中的每一个可以包括绕组，所述绕组可以绕着以下游方向延伸的对应线性线圈轴缠绕。