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According to the results of the Bureau's experiments, sweet potato culls offer some possibility as a source of starch for sizing paper and for paper adhesive. The culls constitute a huge waste in the southern states, and this Bureau and the Bureau of Chemistry and Soils are jointly endeavoring to find ways of making profitable use of them.
Cornstarch and cassava starch are used extensively in book papers to improve their printing quality. The Bureau made and tested wood-fiber book papers sized with these starches and with sweet potato starch and the latter compared very favorably with the others. The same kind of experiments are now being made with rag-fiber papers.
Dextrin-made from cassava starch, which is imported, is used as an adhesive for postage stamps, envelopes, labels, and other paper products, and for this purpose it is superior to the present cornstarch dextrins as it has better adhesive quality. Gum made from sweet potato dextrin, however, was apparently equal to cassava gum in all respects.
It is planned to extend these semi-commercial tests to trials on a commercial scale as soon as sufficient sweet potato starch is made available through production of it in a commercial plant now being built.
APPROVED.
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