Spraying starch on the Fourdrinier— An option between wet end starch  and the size press, TAPPI Journal January 2021



Application: The described “spray starch” technology represents a realistic alternative for some existing Fourdrinier and cylinder board paper machines as a tool to achieve various strength specifications.

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Author: Cole Price and Martin Hubbe
Spraying starch on the Fourdrinier— An option between wet en
ABSTRACT: Technology to apply suspensions of starch grains to the wet surface of paper, during the dewatering process, is reviewed. Though the technology is not new, it continues to attract the attention of papermakers as a means to increase bonding strength. Starch grains that are sprayed onto the wet-web of paper can be retained at levels exceeding what can be effectively added to the fiber suspension at the wet end. Unlike adding a starch solution at a size press, no additional drying capacity is required on the paper machine. To be effective, the starch needs to be able to swell and develop bonding during the paper drying process. Paperboard applications with recycled fibers appear to be a good fit. There is potential to increase bonding by processes that favor fuller gelatinization of the starch grains by the time the paper becomes dry.
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