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纸张本质上是亲水的,有着产生毛细管现象的无数空隙,因而它的吸水性非常好。为了控制这一属性,并为印刷提供必要的抗水性,造纸中使用了施胶剂。尽管施胶剂的添加量不足1%(对纸浆质量),但在纸张使用性能方面发挥了重要的作用。施胶剂常常与淀粉、固着剂、促进剂和填料等化学品一起使用,因此,化学品之间的协同作用很重要。此外,施胶剂的施胶效果受纸浆种类的影响很大。随着最近碱性造纸的发展、生产率改善和印刷方式多样化,纸张施胶正显示出表面施胶比浆内施胶更重要的趋势。
The paper is hydrophilic in nature with innumerable voids that cause capillary phenomena, so its water absorption is excellent. To control this property and provide the printing with the necessary water resistance, a sizing agent is used in papermaking. Although sizing agents are added in an amount of less than 1% (on pulp quality), they play an important role in paper properties. Sizing agents are often used with chemicals such as starches, fixatives, accelerators and fillers, so the synergies between the chemicals are important. In addition, the sizing effect of sizing agents is strongly influenced by the type of pulp. With the recent development of alkaline papermaking, improved productivity and diversified printing methods, paper sizing is showing a tendency that surface sizing is more important than in-sizing.