Spraying of microfibrillated cellulose
AssigneeBorregaard AS
InventorAnne OPSTAD
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Abstract
The present invention relates to a process for the spraying of microfibrillated cellulose (MFC), which has a comparatively high solids content, onto a surface, thus forming a stable and homogeneous film coating of MFC on said surface. Therein, the MFC of the comparatively high solids content is subjected to a pressure drop in a nozzle, which pressure drop exerts shear pressure onto the MFC, thus lowering the viscosity during the spraying and coating process.
Claims20
A process for spraying microfibrillated cellulose onto a surface, said microfibrillated cellulose having a MFC solids content in range of 1% weight by weight (“w/w”)-50% w/w, wherein said process comprises at least the following steps:
- (i) providing microfibrillated cellulose (MFC) in a solvent, wherein solids content of the MFC is in a range of 1% weight by weight (“w/w”)-50% w/w and providing a surface;
- (ii) spraying said microfibrillated cellulose from step (i), through a nozzle, onto said surface, wherein said nozzle provides a pressure drop of from 2 bar to 200 bar, preferably of wherein said pressure drop is measured in regard to a volume segment upstream of the nozzle and a volume segment downstream the nozzle, wherein the temperature of said surface is from −25° C. to 200° C.
Dependencies are inferred from the claim text.