长网纸机纸张黑斑的成因分析及措施

Analysis on the Causes of Black Patch in Paper Made by Fourdrinierand Its Solutions

长网纸机生产文化纸成纸的黑斑对印刷有不利的影响,通过对生产系统的调整,包括对网部浆料的脱水速率、网前箱着网点、稳浆箱改进、打浆工艺的优化,使纸机系统的抄造性能更加稳定,黑斑问题也得到了根本上的解决。

This paper expounds the influence of black patch （bright patch） in Fourdrinier to the printing account for the causes of black patch, including equipments and technology etc. Finally, we adjust to the production system and process control,including rate of water loss, jet net point, the steady box, the proportations of pulp, beat ability.~en paper machine system was more stable ,the problem had been solved primarily.