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生产设备长时间停车后，由于浆液中含有游离酸，会腐蚀设备，产生铁离子含量升高，最终导致再生产时的丝束白度 b 值升高，如升高的程度过大，丝束会明显发黄，导致不合格产品的出现，加上开车浪费大量的人力和物力，一旦开车不会轻易停下来，即如果出现不合格品根本就没有调整的时间。本文主要描述检测浆液白度的可行性方法，可以提前表征丝束的大致白度，对可控范围内的调整提供重要依据。“,”after the production equipment is shut down for a long time, the slurry containing free acid will corrode the equipment, resulting in the increase of iron ion content, which will eventually lead to the increase of tow whiteness b value during reproduction. If the increase degree is too large, the tow will obviously turn yellow, leading to the emergence of unqualified products. In addition, a lot of manpower and material resources are wasted during the start-up. Once the start-up, it will not stop easily, That is, if there is a non-conforming product, there is no time to adjust. This paper mainly describes the feasibility of detecting the whiteness of the slurry, which can characterize the approximate whiteness of the tow in advance and provide an important basis for the adjustment within the controllable range.