Abstract: An improvement in a method for producing paper is disclosed. The paper-producing method involves the steps of preparing a slurry of high lignin content having a predetermined freeness and containing from 1 to 20 percent by weight of fibers, refining the slurry to enable the production therefrom of paper having predetermined properties, forming a web from the slurry and drying the web. The improvement involves treating the high lignin content slurry, prior to the refining step, with a sodium, potassium or lithium alkaline sulfite/sulfide/carbonate solution at atmospheric pressure at a temperature of at least 60.degree. C. and at a pH of at least 10 for from 10 to 60 minutes. The amount of the sulfite/sulfide/carbonate solution should be sufficient that the treatment increases the strength of paper made at the same degree of freeness. The slurry should be one in which at least 50 percent of the fibers are softwood fibers and containing not more than 3.0 percent of residual cooking chemicals.

Abstract: The dry waste paper is directly fed in a disintegrator, functioning with a pulp consistency, at the disintegrator outlet, of between 20 and 50%, where it is disintegrated in the presence of an aqueous phase and at least one bleaching agent.

Abstract: Waste paper containing encapsulated constituents such as inks is bleached by pulping it in the presence of an aqueous alkaline solution which contains a peroxide compound such as hydrogen peroxide.

Abstract: A printed waste paper de-inking composition for use in the "washing" process is disclosed containing:(A) a salt of a fatty acid present in an amount of between 15% and 32% based upon the weight of the entire composition;(B) a nonionic ethoxylated and/or propoxylated surfactant present in an amount between 5% and 25% based upon the weight of the entire composition;(C) an anionic surfactant represented by sulphonates or sulphates present in an amount of between 2% and 8% based upon the weight of the entire composition;(D) a sodium carboxylmethylcellulose in an amount of between 1% and 5% based upon the weight of the entire composition; and(E) an alkaline inorganic salt of the group comprising metasilicate, disilicate, carbonate, borate and polyphosphates, the alkaline inorganic salt present in an amount of between 30% and 80% based upon the weight of the entire composition; the percentages of the components (A), (B), (C), (D), and (E) totaling essentially 100%An improved "washing" process for de-inking printed

Abstract: A process for the reclamation of waste paper in the presence of an aqueous alkaline solution comprises having the solution contain at least a carboxylated polymer.

Abstract: A de-inking composition is disclosed consisting substantially of:(A) a salt of a fatty acid of the formula: R--COO--M wherein R represents one or more hydrocarbon chains selected from the class consisting of saturated and/or unsaturated hydrocarbons; and M represents a metal selected from the class consisting of Na and K; said fatty acid salt being present in an amount between 5% and 32% with respect to the weight of the entire composition;(B) a non-ionic ethoxylated and/or propoxylated surfactant of the formula: ##STR1## wherein: Y is either H or CH.sub.3 ;R.sup.1 O represents the hydrophobic moiety of the molecule and is derived from a compound selected from the class consisting of alkylphenols of formula ##STR2## saturated primary fatty alcohols of formula R"--CH.sub.2 OH; saturated secondary fatty alcohols of formula R"' ##STR3## fatty acids of the formula R.sup.v --COOH; and mixtures thereof, wherein R', R", R"', R.sup.iv and R.sup.

Abstract: In the recycling of wastepaper, paper products containing significant quantities of bitumen are treated to remove the bitumen prior to manufacture of new cellulosic products from the recycled stock. The process involves heating the reslushed wastepaper stock in the presence of a hydrophobic (plastic) material at a temperature greater than the softening point of the bitumen. During the heating, the system is agitated and a surface active agent is optionally added. The hydrophobic material takes up the bitumen and is separated from the wastepaper stock.

Abstract: Components of pulped scrap material containing paper, metal and plastic materials are separated by subjecting the pulped material to sorting in cyclone separators, the discharge from the top part thereof being led to a screen sorter where the material is divided into two parts, one part containing in its major part paper stuff, the other part containing plastic material, the discharge from the bottom part of the cyclone separators containing metal components.

Abstract: A method for recovering cellulosic fibres from thermoplastic-fibreboard laminates such as fruit juice and milk cartons. The method involves heating the laminate in a pulping liquor to a temperature equal to or greater than the softening point of the thermoplastic material. This is followed by cooling to a temperature below the softening point and defibration by mechanical or explosive means. The method results in a mixture of thermoplastic fragments and cellulosic fibres which can be readily separated by conventional means. Pressure may be applied to the laminate/liquor system to accelerate the process.

Abstract: In the recovery of cellulosic fibre of papermaking quality from foil laminated papers and boards, the laminate is heated and pressurized in the presence of an aqueous liquor, subjected to rapid discharge to a lower pressure environment under reduced pressure and optionally subjected to mechanical agitation. This treatment provides a product stream which can be separated into cellulosic fibre suitable for the further manufacture of fibrous cellulosic articles and a metallic foil suitable for subsequent manufacture of metallic articles.

Abstract: A de-inking process for removing ink and other substances from printed paper which process is capable of providing de-inked paper stock having improved brightness. The process utilizes an aqueous de-inking solution containing a mixture of certain surfactants, at least one surfactant being a water-soluble nonionic surfactant and the other surfactant being an oil-soluble nonionic surfactant. De-inking is carried out at a temperature in the range of about room temperature to about the boiling temperature of the solution by forming a slurry of the printed paper in the solution having a predetermined fibrous material solids content. The total nonionic surfactant concentration in the de-inking solution can be about 0.1 to about 5 weight percent, preferably about 0.5 to about 2.5 weight percent, based on the amount of fibrous material solids present. The weight ratio of the water-soluble surfactant to the oil-soluble surfactant in the mixture is in a range of about 6:1 to about 3:1, preferably about 4:1.

Abstract: Waste paper, particularly newsprint, is treated to release adhering ink particles (e.g. pigment carbon) from the paper fibers, and the ink solids (and organic contaminants) are then preferentially collected on the surface of inserted non-soap solids which have an affinity for, and are of larger size than, the ink solids. The ink-coated solids can be removed from the system by suitable physical means such as hydrocyclones, screens or decantation.

Abstract: Disclosure is made of improved apparatus for continuously processing waste papers, contaminated with inks, adhesives, resins, groundwood, foreign objects, paper fasteners and the like, into usable grades of cellulosic fiber pulps. The disclosure is also of a method for the continuous processing of contaminated waste papers into nearly quantitative yields of usable cellulosic fiber pulps.

Abstract: A method for deinking printed wastepapers in a system of separators through which printed wastepapers, previously impregnated with surface-active agents and alkalis, and repulped in the presence of an organic hydrocarbon compound and high-adsorptive flakes obtained by precipitating solutions of metal soaps of fatty or bituminous acids with solutions of salts of alkaline earths, are forced. The adsorptive flakes containing printing ink are separated from the repulped paper stock by latent vortex action.

Abstract: Fertilizers with controlled nutrient release produced from the treatment of solid waste with a phosphate to derive paper pulp and precipitated inks, coatings and waxes removed from the paper fibers.

Abstract: Waste paper is treated to recover the fiber content thereof in a clean condition and without damaging the fibers by shredding the paper, admixing the paper with a treatment agent, retaining the paper and admixed treatment agent in a treatment zone for a period of time during which the paper is substantially completely disintegrated in the treatment agent, diluting the mixture, and processing the mixture through further treatment stations to a final flotation stage wherein the now clean fibers are separated from the liquid whereby the fibers can then be used in a further papermaking operation.

Abstract: Printed waste cellulosic stock can be efficiently deinked by pulping the stock in the presence of based on the weight of the stock from 0.5 to 2% by weight of an alkali metal hydroxide and from 0.3 to 0.7% by weight of certain phosphate mono and diesters anionic surfactants.

Abstract: Waste paper is effectively deinked by contact with an aqueous treating composition containing an N-alkyllactam solvent at a temperature of from about 110.degree.F to about 210.degree.F. The N-alkyllactam solvent is not consumed in the treating process and can be effectively separated from the waste material removed from the paper being treated for reuse in the contacting of additional quantities of waste paper. The use of N-cyclohexyl pyrrolidone, N-t-butyl pyrrolidone and N-t-octyl pyrrolidone is particularly advantageous in that simplified regeneration techniques of appreciable technical and economic significance can be employed therewith. The aqueous treating composition will generally contain from about 0.5 to about 200 parts by weight of water, from about 0.05 to about 1 part by weight of a water-soluble, non-volatile, inorganic ionic compound, e.g., NaOH, and from about 1 to about 99 parts by weight of the N-alkyllactam solvent. The deinking is carried out at a temperature of from about 110.degree.

Abstract: Municipal solid waste is treated by a method in which pollution of air, water and soil is minimized. Light, long fiber paper pulp which is in great demand and fertilizer which controllably releases its nutrients are recovered which render the treatment efficient and economical. The solid waste after removal of ferrous and non-ferrous metals, glass and other aggregates, is sonically pulped to prevent shearing of fibers using such chemicals that when subsequently phosphated, and xanthated if desired, will cause salts to precipitate with inks, coatings and waxes removed from the fibers to provide fertilizers with controlled nutrient release on the one hand and high quality paper pulp on the other.

Abstract: A method of recovering waste paper of a pressure sensitive copying paper which comprises, in the defibration processing for regenerating the waste paper, using an alkaline solution containing a surface active agent. This method provides a white pulp which is hardly stained.