Study on the Influence of Different Hydroxy-based Polymer Coatings on the Moisture Absorption/Desorption Properties and Humidity Control Capability of Coated Paper
This study investigated the influence of three different hydroxy-based polymer coatings and coating weights on the moisture absorption/desorption properties and humidity control performance of coated paper.Additionally,an evaluation system was developed to real-time detect hu-midity changes in a sealed microenvironment,aiming to explore the feasibility of using coated paper for humidity control in such environments un-der various external humidity conditions.The results showed that the sodium carboxymethyl cellulose(CMC)coated paper exhibited the most fa-vorable moisture absorption/desorption properties and humidity control performance compared to sodium alginate(SA)and polyvinyl alcohol(PVA)coatings.Specifically,when the coating weight was 8.5 g/m2,the CMC coated paper(compared to uncoated base paper)showed a signifi-cant increase of 70.2%in moisture absorption capacity and 234.2%in moisture desorption capacity.Under the effect of high humidity or dry envi-ronment,after four opening and closing,compared with the uncoated base paper,CMC coated paper(with a coating weight of 34.1 g/m2)could reduced and inoreased the humidity fluctuation vaue of closed mi-croenvironment by 11.5 and 8.6 percentage points,respectively.
sodium alginatepolyvinyl alcoholCMCmoisture adsorption/desorption propertymoisture control performance
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