The present invention relates to a crumple-resistant security sheet comprising fibers; an anionic polymer in a proportion lying in the range 5% to 45% by dry weight relative to the total dry weight of the fibers, and presenting a glass transition temperature greater than 40 C.; and a main cationic flocculation agent in a quantity lying in the range 1% to 5% by dry weight relative to the total dry weight of the fibers.

The disclosure provides a paper laminate comprising a dcor paper prepared from a dispersion having improved optical performance without negatively impacting mechanical strength, wherein the dispersion comprises a TiO.sub.2 particle slurry comprising a treated TiO.sub.2 particle having a surface area of at least about 30 m.sup.2/g, and a cationic polymer; wherein the treatment comprises an oxide of silicon, aluminum, phosphorus or mixtures thereof; and the treatment is present in the amount of at least 15% based on the total weight of the treated titanium dioxide particle; paper pulp; and a cationic polymer; wherein the cationic polymer in the slurry and the cationic polymer in the dispersion are compatible; wherein for equal optical performance, the amount of treated TiO.sub.2 particle in the dispersion is reduced by about 10% when compared to a dispersion not comprising the treated TiO.sub.2 particle of (a).

The disclosure provides a paper laminate comprising a dcor paper prepared from a dispersion having improved optical performance without negatively impacting mechanical strength, wherein the dispersion comprises a TiO.sub.2 particle slurry comprising a treated TiO.sub.2 particle having a surface area of at least about 30 m.sup.2/g, and a cationic polymer; wherein the treatment comprises an oxide of silicon, aluminum, phosphorus or mixtures thereof; and the treatment is present in the amount of at least 15% based on the total weight of the treated titanium dioxide particle; paper pulp; and a cationic polymer; wherein the cationic polymer in the slurry and the cationic polymer in the dispersion are compatible; wherein for equal optical performance, the amount of treated TiO.sub.2 particle in the dispersion is reduced by about 10% when compared to a dispersion not comprising the treated TiO.sub.2 particle of (a).

A system and method is provided that allows for the non-interrupted coating of a pulled substrate with coating materials, even while a coated portion of the substrate is held stationary for cutting. The present invention eliminates waste and improves efficiency and yield, and is particularly applicable to laboratory drawdown coaters.