Common tissue paper manufacturing trends aim at partial or total replacement of softwood pulp with hardwood pulp for its production, such as bleached eucalyptus kraft pulp (BEKP), in order to optimize the process and the final product properties such as softness. However, the use of a single type of hardwood fiber results in lower strengths of both wet and dry webs. To maintain necessary strength and desired properties, the incorporation of several additives is often required. In this context, low molecular weight polyethylene glycol (PEG) and different wet strength resins, such as polyamideamine-epichlorohydrin (PAE) and glyoxalated polyacrylamide (GPAM) resins, were combined to achieve an innovated product with improved properties. In particular, wet and dry tensile strength was significantly improved when combining PEG and wet strength resins, especially observed in tissue papers prepared with PAE resin, high-charge cationic agent and bulk applied aqueous PEG solution. Noteworthy that water absorption capacity and softness of tissue paper were not critically affected by PEG incorporation, regardless of application method used (in bulk or by spray).

中文翻译：

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掺入湿强树脂的改进漂白桉树牛皮纸浆基薄页纸

常见的卫生纸制造趋势旨在用阔叶木浆（例如漂白桉树牛皮纸浆（BEKP））部分或全部替代针叶木浆，以优化工艺和最终产品特性（例如柔软度）。然而，使用单一类型的硬木纤维会导致湿纤维网和干纤维网的强度较低。为了保持必要的强度和所需的性能，通常需要加入多种添加剂。在此背景下，将低分子量聚乙二醇（PEG）与不同湿强度树脂（例如聚酰胺胺环氧氯丙烷（PAE）和乙二醛化聚丙烯酰胺（GPAM）树脂）相结合，以获得具有改进性能的创新产品。特别是，当将 PEG 与湿强树脂结合时，湿态和干态拉伸强度显着提高，尤其是在用 PAE 树脂、高电荷阳离子剂和散装 PEG 水溶液制备的薄纸中观察到。值得注意的是，无论使用何种施用方法（散装或喷雾），薄纸的吸水能力和柔软度都不会受到 PEG 掺入的严重影响。