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首页> 外文会议>TAPPI Papermakers Conference 2006 vol.1 >Optimizing Sizing and Retention Efficiency in Bleached Board Applications
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Optimizing Sizing and Retention Efficiency in Bleached Board Applications

机译：在漂白纸板应用中优化尺寸和保留效率

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Rosin sizing at pH between 4.2 - 5.5 remains the dominant means of imparting basesheet water repellency for the bleached board market in North America. While rosin sizing agents based on either liquid or dispersion sizes are fairly inexpensive, readily available, and their response on-machine is quick while having a gradual dosage-response curve, they generally require alum or another multi-valent cationic species as a mordant. Controlling the alum dosage is critical to the success of these products, and alum hydrolysis is a key aspect of their functionality. The same alum chemistry which assists in sizing of bleached board has made the use of drainage and retention aids for enhancing machine production a challenge. Typical microparticle programs based on colloidal silica can encounter problems in efficiency at lower pH due to interactions with excess dissolved alumina. A niche for improving drainage and retention in bleached board manufacture exists, and should be compatible with alum chemistry. One means of satisfying this need is to combine the benefits of traditional rosin sizing with an inorganic microparticle into a single product that is also compatible with cationic flocculants. StaFlex is a DSA technology (drainage and sizing aid) which not only enhances vacuum and free drainage but also provides for more efficient rosin sizing. The product also meets the requirement of being easy to meter and handle on-machine.
机译：pH值为4.2-5.5的松香施胶仍然是北美漂白板市场赋予底片憎水性的主要手段。尽管基于液体或分散体尺寸的松香施胶剂相当便宜，易于获得，并且它们在机器上的响应速度很快，同时具有逐渐变化的剂量反应曲线，但它们通常需要明矾或其他多价阳离子物种作为媒染剂。控制明矾的剂量对于这些产品的成功至关重要，明矾水解是其功能的关键方面。有助于漂白板施胶的相同明矾化学性质，使排水和固着助剂的使用对提高机器的生产构成了挑战。基于胶体二氧化硅的典型微粒程序可能会由于与过量溶解的氧化铝相互作用而在较低pH值下遇到效率问题。存在改善漂白板制造中的排水和保留的利基市场，并且应该与明矾化学​​相容。满足此需求的一种方法是将传统松香上浆剂与无机微粒的优点结合到也可与阳离子絮凝剂相容的单一产品中。 StaFlex是一种DSA技术（排水和施胶助剂），不仅可以提高真空度和自由排水能力，还可以提供更有效的松香施胶。该产品还满足在机器上易于计量和处理的要求。

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