Increasing Rice-Hull Paperboard Tensile Strength – A Preliminary Study
In a previous study, rice hulls were added during wet pulp making. The tensile strength of the rice-hull paperboard dropped as more rice hulls were added. With 100% rice-hull content, the paperboard crumbled with no tensile strength. In this preliminary study, there are two methods to improve the tensile strength of rice-hull paper board:
.Pressing Weight Study. Wet rice-hull paperboard was pressed while it dried. The tensile index of the paperboard with 50% rice-hull content increased at 0.0954 N-m/g per lb. of Pressing Weight.
Tensile Index (N-m/g) = 0.0954 * Pressing Weight (lb.) + 1.4717
.Particle Size Study. Rice hulls were ground using a coffee grinder at Coarse and Extra Fine particle sizes. The tensile index of the paperboard with 50% rice-hull content was 32.5% higher when the Extra Find particle-size grinding was used compared to the Coarse particle-size grinding.
Keywords Paperboard; Rice Hulls; Pressing; Bonding; Grain Size
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