Low density material containing a vegetable filler
OwnerDaniel Gomezinventor
Life of this patent
Estimating the term…
Abstract
A process for reducing the density, increasing the bulk, the hand and the porosity of a sheet material containing fibers by use of a vegetable filler, wherein a pulverulant vegetable filler of density less than 500 kg/m.sup.3 is introduced into the fibrous mass during the manufacture of the material. At least 95% by weight of the particles of the vegetable filler are less than 150 micrometers in size and at least 80% by weight of the particles of vegetable filler are greater than 10 micrometers in size. The process is particularly useful for obtaining paper and cardboard of low density with improved hand (or bulk) and porosity. It is also attractive since it reduces the cost prices and enhances the thermal and acoustic insulation properties.
Claims5
A method for the preparation of a fibrous sheet material by a paperworking technique, comprising:
- providing an aqueous dispersion containing fibers:
- producing pulverulent vegetable filler by a grinding-micronization operation of planings from vegetable material having a mean particle size of less than 5 mm and a residual moisture content of less than 20% by weight;
- said vegetable filler having a density of less than 500 Kg/m.sup.3 and a particle size wherein at least 95% by weight of the vegetable filler has a dimension size lower than 150 micrometers and more than 80% by weight of the vegetable filler has a dimension size larger than 10 micrometers;
- and
- introducing said vegetable filler into said aqueous solution.
Dependencies are inferred from the claim text.