The impact of biocides on the sizing of fine papers

Paper mills use many types of biocide chemistries in their processes to con trol the growth of fungi, bacteria and algae, and also to preserve paper-ma king chemicals such as pigment slurries, starch solutions and coating formu lations susceptible to degradation. Little information is available to the papermaker about how these complex mixtures of molecules affect papermaking chemistry and final paper properties. In this study, an extensive number o f nonoxidizing biocides were studied for their impact on wet-end and surfac e sizing.