WET STRENGTH ALTERNATIVE FOR TOWEL GRADES, 23TAPPICon 

Polyamidoamine epichlorohydrin (PAE) resins have been the predominant chemistry used for generating wet strength in towel grades for the last 50 years. PAE resins are highly efficient in generating wet strength in towel with low wet strength decay when the towel is exposed to water. However, there are several downsides coming from PAE resins. These include process inefficiencies due to excessive foam or felt-filling, difficulties with wet strength broke repulpability, as well as increased regulatory scrutiny due to harmful chloro-organic byproducts present in PAE resins. Therefore, the tissue market has been looking for effective and cleaner alternatives. One such alternative is glyoxalated polyacrylamide (GPAM).

GPAM resins are known to generate temporary wet strength, providing high initial wet tensile strength that decays relatively fast in water. The rate of decay can be controlled by the GPAM design, yet so far no GPAM product has been available in the market that can match the wet strength permanency of PAE resins required for towel grades. We have developed a new GPAM-based program providing wet strength permanency, which is close to that achieved with PAE resins and with additional benefits such as dry strength, improved repulpability and no chloro-organic impurities.

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