Methods for treating the surface of starch-based articles with g

Coating processes – With post-treatment of coating or coating material – Heating or drying

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427316, B05D 302, A21D 1508

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057166757

ABSTRACT:
Compositions and methods for the post-production treatment of a starch-bound article to increase the flexibility of the treated article by softening or plasticizing the article through the application of a polyalcohol, preferably glycerin. The glycerin is preferably mixed with water before application to aid in penetrating the cellular matrix of the article. The glycerin acts as a plasticizer and a humectant, and it stabilizes the starch-bound matrix against warping that otherwise results when water-borne substances are applied to the surface of a starch-bound article. The glycerin treatment can be applied to a hinge to increase the resilience and durability of the hinge, generally by causing the inner hinge surface to be more collapsible, which greatly decreases the radius of bending of the outer surface of the hinge and which thereby reduces the amount of strain or elongation exerted on the outer surface of the hinge. The mixture of glycerin and water may optionally further include a water-based coating, such as polyvinyl alcohol, and/or an inorganic mineral such as kaolin.

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