Screen Printed Moisture Sensor and Its Application on Smart Packaging


Document ID: 
Ruoxi Ma, Alexandra Pekarovicova


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The hemicellulose-based suspension with nano-fibrillated cellulose (NFC) composite film exhibit outstanding air barrier properties, which supports their applications as bio-based and biodegradable barrier coating on food packaging materials. The hydrophobic property of the hemicellulose-based biopolymer has been greatly improved (MVTR decreased by 49.7%) with crosslinking by using citric acid.

In this work, the crosslinked bio-polymer suspension was applied on solid bleached sulphate (SBS) board with a Meyer rod. Interdigitated electrodes were designed as moisture sensors and then screen printed on the coated SBS board with silver conductive ink. The hemicellulose-based barrier coating layer functioned as a moisture sensing layer. The printed sensor device was calibrated with its absorption and desorption isotherms at 23 degC with the range of relative humidity 20%-80%, followed by characterizations of the sensor's impedance change with each moisture level ranging from RH 20% to 80%. The breakthrough time was observed for each level of RH by measuring impedance using the LCR meter.

These findings point to the opportunity of coupling the hemicellulose-based barrier coatings with printed moisture sensors in order to boost their capabilities as smart barrier packaging materials.

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