Abstract: Speckle-patterned paper is produced on the paper machine without the use of printing techniques by first preparing speckle-forming material and then introducing this into a contrasting color papermaking furnish. Paper is then made from the speckle-containing furnish in the normal way. The speckle-forming material is produced either by agglomerating a mixture of papermaking fibre, particulate pigment and, preferably, a latex or other binder or by dry comminution of cellulose fibre aggregates in the form of paper or entangled fibre clumps.

Abstract: A method for making a paper sheet comprising at least one region which is thinner than the rest of the sheet. According to the method, a first paper layer (3) is formed on a wire in a first wet end of a paper-making machine, a second paper layer (5) is formed on a wire in a second wet end of the paper-making machine, one of the two paper layers has a number of localized tinner regions (8) so that the thickness (e2) of said paper layers in said regions is up to 50% less than the thickness (et) of the rest of the sheet, and the two layers are joined together and dried. The resulting paper may be used in banknotes or checks.

Abstract: A method of producing a two-color mottle-effect patterned paper comprises the steps of coloring a papermaking stock by means of a first dye formulation, draining the resulting colored stock through a papermaking wire to produce a dyed wet paper web, subjecting the web to pressure, applying a second dye formulation to the paper web, said second dye formulation being of a different hue from the first dye formulation, and drying the web. The web is preferably subjected to pressure by passage through a smoothing press nip before passing to the drying section of the papermachine. The smoothing press can be one of the presses of the press section of the papermachine, run in unfelted mode. The second dye formulation is preferably applied at the papermachine size press or by spraying.

Abstract: The invention relates to a paper sheet containing grit particles giving it, in use, a high abrasion resistance. It is characterized in that it contains grit particles coated in a non-abrasive material, in particular in a polymer. According to the invention, the particles are chosen from alumina, silica, boron nitride, silicon carbide, titanium carbide, tungsten carbide, zirconium oxide, cerium oxide, glass and ceramic particles, or mixtures thereof. The invention also relates to the laminates containing it, as well as to the processes for manufacturing the sheets and the laminates.

Abstract: Pressure-sensitive copying material comprises a substrate carrying isolated droplets of an oil solution of chromogenic material confined within respective pressure-rupturable barriers. The chromogenic material develops a colour other than blue or black on contact with colour developer and comprises a component which is fluorescent. This enables the authenticity of the copying material to be verified by irradiation with ultra-violet light to produce fluorescence. The fluorescent material can be, for example 2,2-bis(4-{2-[4-diethylaminophenyl]-quinazolin-4-yloxy}phenyl) propane or 1-(3-methoxy-4-dodecyloxyphenyl)-2-(2'-quinolyl)ethylene. Non-fluorescent chromogenic material(s) are preferably used in combination with the fluorescent chromogenic material(s).

Abstract: The invention relates to an impregnated sheet. It is impregnated with a composition containing, as a mixture, a crosslinkable polymer having a glass transition temperature of between -10.degree. and 35.degree. C., used in the form of a stable aqueous dispersion, other than a styrene/ethyl acrylate/butyl acrylate copolymer, and a water-soluble binder. According to the invention, the water-soluble binder is chosen from poly(vinyl alcohol), gelatin, starches, cellulose derivatives, alginates and mixtures thereof. Application to laminated decorative coverings.

Abstract: A novel aqueous sheet-impregnating composition including a composition of a styrene-ethyl acrylate-butyl acrylate copolymer and a binder. The binder is selected from polyvinyl alcohol, polyvinyl acetate, gelatin and starch, and the composition includes 5-90 parts by weight of a polyvinyl alcohol solution and 10-95 parts by weight of a styrene-ethyl acrylate-butyl acrylate copolymer dispersion. A decorative sheet for laminates may thereby be obtained.

Abstract: The invention relates to a printable, coated, marked sheet which is formed by a marked base covered on at least one of its sides by at least one pigmented coating and more particularly a matt coating. The invention furthermore relates to the manufacturing process of such a sheet.

Abstract: According to the invention, it includes conductive pigments constituted by a substrate (chosen from the group including micas, talcum, kaolin, bentonites, montmorillionites or glass particles) which has a basic lamellar-type structure coated with an electroconductive layer of tin oxide doped with antimony. On at least one face, the sheet has a layer containing at least the conductive pigments having a basic lamellar-type structure and at least one hydrosoluble binder.Application as decorative paper for laminates.

Abstract: A printable sheet having a high printing quality and a high handling resistance. At least one of the sides of the sheet is treated with a composition which comprises at least one filler and at least one elastomeric binder. The elastomeric binder is selected from the group consisting of aqueous dispersions of polyurethane, acrylate copolymers, optionally carboxylated styrene-butadiene copolymers, and polymers of which one of the monomers is acrylonitrile, isoprene, or neoprene, or mixtures thereof. The sheet can be used for manufacturing protected documents.

Abstract: Paper coated on at least one side with a pigmented layer, the dry weight of the layer per side being at least 12 g/m.sup.2. The sheet's surface resistivity is less than or equal to 10.sup.11 ohms at 50% relative humidity measured according to the ASTM D257-66 standard.

Abstract: The invention relates to a surface sheet produced by the papermaking method used in the production of abrasion-resistant laminates comprising glass wool fibers. According to the invention, the sheet comprises, before impregnation with thermosetting resin, up to about 7% by dry weight of glass wool fibers with respect to its total dry weight. The invention finds an application as protective covering sheet called overlay and as decorative sheet.

Abstract: A new process for making an embossing punch comprises the steps of: (a) the values of an image are put into numeric form; and, (b) the punch is automatically and directly engraved. The numeric image is converted into continuous control values for a path of an engraving tool over a continuous surface and the level curves of said surface are plotted to provide the continuous engraving path. One possible application is embossing fabrics for the manufacture of watermarked paper.

Abstract: The present invention relates to a basic composition for the manufacture of a product in sheet form, obtained in particular by the wet method, of the type comprising a mixture of a polymer powder of given granulometry and of fibers, characterized in that it comprises a preferably intimate mixture of:a) at least one elastomer powder, of granulometry less than about 500 .mu.m, called elastomer fine dust, andb) fibers of length less than about 10 mm, selected from the group composed of natural fibers, inorganic fibers and mixtures thereof.

Abstract: The invention concerns an imprintable, flexible, synthetic support bearing at least one authentication or security mark.This support comprises:a substrate of synthetic materialat least one mark on at least one face of the support and consisting of at least one layer of a composition altering the substrate opacity,at least one layer of an imprintable pigment composition deposited on the face bearing the mark and optionally also on the substrate face without the mark, the mark being barely or not at all visible in reflected light and perfectly visible in transmitted light.Application to the security of synthetic paper.