Method of improving dewatering efficiency, increasing sheet wet web strength, increasing sheet wet strength and enhancing filler retention in papermaking

摘要

The invention provides a method of improving dewatering efficiency, increasing sheet wet web strength, increasing sheet wet strength and enhancing filler retention in a papermaking process The method improves the efficiency of drainage aids or wet web strength aids or wet strength aid by coating at least some of the filler particles with a material that prevents the filler materials form adhering to a those additives. The drainage additive or wet web strength additive or wet strength aid holds the cellulose fibers together tightly and is not wasted on the filler particles.

主权项

1. A method of papermaking, the method comprising the steps of:
treating filler particles in a container with a composition of matter in the absence of cellulose fiber stock by contacting the filler particles with a rotating admixing apparatus having a distribution head rotating at a rotational speed of 1800 to 3000 rpm while the filler particles are in the container, combining the treated filler particles with the cellulose fiber stock thereby forming a combination, treating the combination with at least one wet strength aid or wet web strength additive or drainage additive, and forming a paper mat from the combination,wherein the filler particles are selected from precipitated calcium carbonate, ground calcium carbonate, and any combination thereof, the cellulose fiber stock comprises a plurality of cellulose fibers and water, and the composition of matter enhances the performance of the wet strength aid or wet web strength additive or drainage additive in the paper mat,
the distribution head is rotated by a drive, the distribution head is arranged in the container containing a slurry of the filler particles, and the distribution head is associated with a rotational plane, and the distribution head has, along a circumference thereof, which surrounds a rotational axis, distributed outlets from which the composition is passed into the container bearing a slurry of filler particles and mixing blades, characterized in that the outlets are formed as openings and the mixing blades are formed as strips extending transverse to the rotational plane and having a length equal at least half of an inner diameter of the container; and the composition is dispersed by the distribution head to the filler particles.