Processes for the production of a vegetable powder using backrests of agro-industrial processes and processes for the production of paper and paperboard with this powder

摘要

A method for producing a vegetable flour for producing papers and cardboards having particular tactile, visual and olfactory characteristics, using residues of agroindustrial processes, particularly shells, pits and peels. The method provides a step for milling the residual shells, pits and peels with a dry content of more than 85% by weight, performed without damaging or breaking the cell walls of the source vegetable material, optionally preceded by a step for drying at a controlled temperature, so that the temperature of the vegetable material does not exceed 90 DEG C. The method for producing paper and cardboards comprises the steps of subjecting the flour to a screening step that allows to obtain a flour that is constituted by particles with an average diameter of 1 to 40 micrometers, and an additional step for mixing the milled and screened flour with an aqueous dispersion of cellulose fibers.