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Variation in the contact angle as a function of time for paperboard coated with different agar–agar/chitosan ratios (AA:CHI) and different numbers of coating layers: (a) different ratios AA:CHI and different numbers of layers (one and two layers), (b) papers coated with 50:50 and 00:100, different scales, and (c) papers coated with 100:00, different scales.
