Kymene™ wet strength additives
Trusted by papermakers since 1957, Kymene wet strength additives comprise a family of water-soluble polymer products that significantly improve the wet strength of paper.
The most commonly used Kymene products are formulated with polyamide-epichlorohydrin (PAE) resin chemistry and are designed to be used at neutral-to-alkaline pH. PAE resins have a high level of wet strength permanence, help improve machine efficiency, and do not adversely affect paper absorbency as do some other chemistries. Recent development work has focused on improving the wet strength efficiency of Kymene products while increasing product solids and decreasing organic chlorine content. Today, there are many new Kymene products available that offer these benefits.
Kymene wet strength additives are most effective over a stock pH range of 4 to 9. However, because these products are alkaline curing, the best performance is obtained at pH 6.5 to 8.5. Optimum results are obtained by adding the Kymene product to high-consistency stock either before or preferably after refining. Wet strength addition rates generally range from 0.2 percent to 1.2 percent dry basis. Dosages outside this range are used occasionally for some specialty grades.
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Application InformationWant to know more about how our products are used?
Kymene wet strength additives significantly improve the wet strength performance of tissue and towel, packaging, and specialty grades such as label papers. Commercial applications confirm this and typically result in a number of value-added benefits.
● Improved wet strength
● Improved retention and drainage
● Enhanced creping control
● Improved dry strength
● Reduced chemical costs
● Improved machine runnability
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ServicesAshland offers a variety of services which complement this product.
Customer Analytical Services
Continuous pilot papermaking systems are the cornerstones of Ashland Water Technologies’ Papermaking Services group.
The primary purpose of our papermaking operations is to provide papermakers with insights and solutions to problems and opportunities
related to the effects of additives and system changes on wet-laid products and processes.
Our facilities are equipped to conduct trials that predict commercial system performance.
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How it WorksThe chemistry behind the solution
During the curing process, the functional groups on the Kymene polymer react with cellulose fiber to form a covalent bond. The polymer molecules cross-link, forming a network in the cellulose web that provides strength when the paper becomes wet. Additionally, Kymene products can reinforce existing fiber-to-fiber bonds, which further enhance the strength of the paper.
Hercobond™ dry strength additives can be used in combination with Kymene
wet strength additives to enhance wet and dry tensile performance. Normally added to the thick stock after the wet strength additive, the Hercobond additive can increase wet and dry tensile performance by as much as 25 percent.
Hercobond additives are especially useful for improving the performance of Kymene additives when Kymene additives are used at high addition rates.