摘要
河南驻马店白云纸业在利用四辊三压2640/500型纸机进行牛皮纸原纸抄造时,发现纸幅表面会产生条痕,这对成纸外观质量造成不利影响。综合分析条痕纸病的外观形式及抄纸过程因素后发现,条痕主要为纵向毛毯痕,是由于纸机运行过程中压榨部正压下辊沟纹印痕引起的。因此,本公司从毛毯设计方面入手,对正压毛毯进行了优化调整,将其定量由1350g/m^(2)调整至1650g/m^(2);并采用了多层基网设计,将原两层网调整为三层网;此外,还采用较大直径单根φ0.4mm的基布纬线代替4根φ0.2mm的基布纬线作为中层基网,以改善毛毯刚性,提高毛毯空隙率和抗压缩性,保证压榨部脱水效率。同时,还提高了正压毛毯基网比例至“基网/毛层=54.5/45.5”,以抵御纸机运行中后期出现的沟纹印痕问题。通过实施上述改进措施后,发现纸面条痕问题得到有效解决。而且,毛毯使用周期延长至30天左右时,仍能满足实际生产需求。
During the production of kraft paper with a four-roll three-nip 2640/500 paper machine at Baiyun Paper in Zhumadian,Henan,the company found that stripes would appear on the surface of the paper sheet,which had a negative impact on the visual quality of the finished paper.After comprehensively analyzing the visual patterns of the stripe defects and the factors in the whole process,it was found that the stripes were mainly longitudinal felt marks caused by indentation marks in the nip rolls under positive pressure during the operation of the paper machine.Therefore,the company optimized the design of the felt by adjusting the weight of the positive pressure felt from 1350 g/m^(2)to 1650 g/m^(2),adopting a multi-layer base fabric design with the original two-layer fabric adjusted to a three-layer fabric,and replacing fourØ0.2 mm weft yarns of the base fabric with a singleØ0.4 mm yarn to improve the rigidity of the felt.After adjustment,the rigidity of the felt was improved,porosity and compression resistance was advanced,thus ensuring the dehydration efficiency of the press section.Additionally,the proportion of the base fabric in the positive pressure felt was increased to“base fabric/felt layer=54.5/45.5”to resist indentation marks that may occur in the later stages of the paper machine’s operation.After implementation of these improved techniques,the stripes occurred on the paper surface was effectively resolved.Furthermore,the felt’s service life was extended to approximately 30 days while still meeting the actual production requirements.
作者
王想
张鹏
石凯
张军
李欣欣
Wang Xiang;Zhang Peng;Shi Kai;Zhang Jun;Li Xinxin(Zhumadian Baiyun Paper Co.,Ltd.,Zhumadian,Henan 463100,China)
出处
《中华纸业》
CAS
2024年第9期102-105,共4页
China Pulp & Paper Industry
关键词
压榨部
条痕
毛毯
沟纹辊
press section
streak mark
press felt
grooved roll
作者简介
王想,女士,助理工程师,公司质检部主管,主要从事制浆造纸新产品研发和成品纸分析检测工作;通讯作者:张鹏,硕士,工程师,主要从事制浆造纸新技术推广和新产品研发工作。zhp-2525@163.com。
