Effects of tissue additives on copy paper forming and properties, TAPPI Journal February 2024

 


Application: Papermaking process engineers can face a variety of challenges, including unexpected interactions between different chemical additives to the process. Expansion of tissue and towel production to mill sites not previously dealing with such products brings the possibility of cross-contamination with production of other paper grades. Partial sharing of process water systems, for instance, can affect both the papermaking process and the attributes of the paper product.

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Effects of tissue additives on copy paper forming and proper
ABSTRACT: Laboratory tests were conducted in an effort to determine the effects on paper machine process attributes and the properties of paper made from recycled copy paper furnish upon the addition of chemical agents that are commonly used in the production of hygiene tissue products. Due to continuing growth in tissue and towel grades of paper, such agents are experiencing greater usage. Charge titration test results revealed that certain dry strength agents associated with tissue manufacturing have the potential to shift the balance of charge in papermaking furnish to less negative or even positive values. Creping adhesive was found to contribute to fine particle retention, especially when present at relatively high levels. Release aid and a polyacrylate dispersant had the opposite effect. Low addition levels of both a creping adhesive and a debonding agent surprisingly increased a wide range of strength attributes of paper handsheets in comparison to sheets prepared from unaltered recycled copy paper furnish. The debonding agent decreased paper strength at higher levels of addition. Such effects appear to depend not only on the expected effects of agents themselves, but also on how they affect the charge balance of the wet-end system.
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