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Processing surface sizing starch using oxidation, enzymatic hydrolysis and ultrasonic treatment methods - preparation and application

: Brenner, T.; Kiessler, B.; Radosta, S.; Arndt, T.


Carbohydrate polymers 138 (2016), pp.273-279
ISSN: 0144-8617
ISSN: 1879-1344
Journal Article
Fraunhofer IAP ()

The surface application of starch is a well-established method for increasing paper strength. In surface sizing, a solution of degraded starch is applied to the paper. Two procedures have proved valuable for starch degradation in the paper mill: enzymatic and thermo-oxidative degradation. The objective of this study was to determine achievable efficiencies of cavitation in preparing degraded starch for surface application on paper. It was found that ultrasonic-assisted starch degradation can provide a starch solution that is suitable for surface sizing. The molecular composition of starch solutions prepared by ultrasonic treatment differed from that of starch solutions degraded by enzymes or by thermo-oxidation. Compared to commercial degradation processes, this resulted in intensified film formation and in greater penetration during surface sizing and ultimately in a higher starch content of the paper. Paper sized with ultrasonically treated starch solutions show the same strength properties compared to commercially sized paper.