Carbon fibers having improved strength and modulus and related methods and apparatus for making same

The present invention relates to carbon fibers having high tensile strength. The invention also provides a method and an apparatus for manufacturing the carbon fiber. The method includes advancing a precursor fiber through an oxidation oven via a plurality of passes, where stretching during an initial pass is minimized or completely eliminated or becomes negative, followed by controlled stretching using rollers of increasing speed in a series of passes. 本发明涉及具有高拉伸强度的碳纤维。本发明还提供了一种用于制造所述碳纤维的方法和设备。所述方法包括推进前体纤维经由多个道次通过氧化烘箱，其中在初始道次期间的拉伸被最小化或完全消除或者变为负的，随后在一系列道次中使用速度递增的辊进行受控拉伸。