Abstract:Dry-processed sheets are typically fabricated by coating plant powders onto fibrous paper substrates with appropriate food-grade adhesives to form uniform films. In this study, the performance of twelve types of adhesives including carboxymethyl cellulose (CMC), hydroxyethyl cellulose ( HEC), hydroxypropyl cellulose (HPC), xanthan gum ( XG), tamarind polysaccharide ( TPS), konjac gum ( KG), chitosan ( CS), gelatin (GEL), guar gum ( GG ), arabic gum ( AG ), modified corn starch, and modified cassava starch was systematically evaluated for application in dry-processed sheets. Adhesive solutions of identical concentration (all dissolved in deionized water) were prepared for different adhesive types, and their solubility and viscosity were characterized. Subsequently, the adhesive solutions were uniformly sprayed onto substrates composed of the same base fiber. The physical properties of the resulting sheets, including basis mass, powder shedding rate, moisture content, and tensile strength were comprehensively tested. Furthermore, the low-temperature pyrolysis products (at 350 ℃) of the adhesives and corresponding sheets were analyzed. The morphology and microstructure of the sheets were observed via scanning electron microscopy (SEM). Results show that CS, AG, XG, GG and CMC are soluble at room temperature. Dry-processed sheets prepared with KG, GG, and CMC exhibit the highest tensile strength (>0.8 kN / m). HEC, GEL and GG display the lowest powder shedding rates. Sheets fabricated using HEC, GEL and GG possess denser microstructures. Overall, GG, HEC and CMC exhibit the optimal application performance in dry-processed sheets.