Method of impregnating and drying materials and installations for carrying out this method
AssigneeMecalix S.A.
InventorJean Monmarson
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Abstract
This specification discloses a method of impregnating and drying material such as cardboard or corrugated cardboard preliminary shaped or not, comprising a certain number of steps and more particularly a step of impregnating cardboard located inside a sealed container by means of an impregnating liquid which is formed by impregnating substance and solvent, a step of drying the cardboard still located inside said container and a step of recovering the solvent during the step of drying in view to recycle it.
Claims6
A method of impregnating and drying cardboard for packaging purpose with impregnating liquid which is formed by an impregnating substance and solvent, said method comprising the steps of isolating the material in a sealed treatment container;
- introducing and maintaining during the treatment period, said impregnating liquid into said treatment container;
- evacuating said impregnating liquid, after said treatment;
- creating a vacuum in said treatment container to extract all traces of solvent by pumping;
- recycling said solvent after pumping;
- said method further comprising the step of removing substantially all traces of oxygen from said treatment container before the step of introducing impregnating liquid;
- and the step of controlling the rate of evaporation and of recovery of the solvent to provent bubbles from forming locally in the cardboard.
Dependencies are inferred from the claim text.