Abstract: Ethyleneamine compound(s), or mixtures thereof, are used in effective amounts to reduce or inhibit the deposition of white pitch on the paper making equipment during the processing to recycle coated paper.

Abstract: Compositions and methods for inhibiting the deposition of organic contaminants from pulp in pulp and papermaking systems are disclosed. The methods add to the pulp or to the deposition prone surface of the papermaking systems a composition comprising a dinonyl sulfosuccinate anionic surfactant which is used in systems containing multivalent cations, preferably calcium ions. The methods also utilize a blend of dioctyl sulfosuccinate and didecyl sulfosuccinate anionic surfactants.

Abstract: The inventors have discovered a new method of treating paper machine white water aqueous systems and surfaces in the paper machine white water aqueous systems that prevents or inhibits the adhesion of bacterial cells to the surfaces and thereby controls the biological fouling of the surfaces. The process comprises adding to the aqueous system an adhesion-inhibiting amount of vinyl cationic polymer. This method effectively inhibits the adhesion of the bacterial cells to exposed surfaces without killing the fouling organisms and also without harming non-target organisms. In addition, the method of the present invention advantageously does not cause the formation of harmful substances in the effluent from the systems treated.

Abstract: A method is disclosed for removing and preventing the buildup of contaminants in papermaking wet press felts and on forming wires using a cleaning solution which contains at least one acidic cleaning compound and peracetic acid.

Abstract: This invention relates to a liquid composition for the control of pitch deposition in pulp and paper making comprising an aqueous solution of (1) a derivatized cationic guar, and (2) styrene maleic anhydride copolymer. The invention also relates to a process for inhibiting pitch deposition in pulp and papermaking systems and on papermaking equipment.

Abstract: A method is disclosed for controlling anionic trash and pitch deposition and treating coated broke which comprises the step of adding a polyammonium quaternary to a pulp and papermaking system. The polyammonium quaternary, which may be either branched or crosslinked, comprises at least one cationic monomer, preferably diallyldimethylammonium chloride, and at least one branching or crosslinking monomer, preferably N,N,N-triallylamine or N,N,N-triallylamine hydrochloride.

Abstract: A method of treating a felt to remove contaminants therein comprises the steps of providing a felt used in transporting paper webs, preparing an enzyme solution comprising an enzyme selected from the group consisting of a cellulase, a hemicellulase, and mixtures thereof, applying the enzyme solution to the felt for a first predetermined period of time, rinsing the felt with water, applying a solution of sodium hydroxide to the felt to remove the enzyme solution, and rinsing the felt with water to remove the sodium hydroxide solution thereby removing the contaminants in the felt.

Abstract: Polynucleate metal hydroxide anionic compounds and method for their production. The compounds have the formula:M.sub.a N.sub.b (OH).sub.c X.sub.d Y.sub.e Z.sub.f.(H.sub.2 O).sub.gwhereinM is a tri- or more valent metal ion;N is a divalent metal ion that forms a soluble salt with anions X, Y or Z;OH represents the level of basicity;X is a monovalent anion;Y is a divalent anion;Z is a trivalent anion;a is 1;b is from 0.15 to 2.0;c is from 0.3 to 5;d is from 0 to 3;e is from 0.1 to 2.25;f is from 0 to 1; andg is greater than 4 where the compound is in the form of an aqueous solution, or from 0 to 20 where the compound is not in the form of an aqueous solution. The compounds are useful for water treatment for removal of suspended solids and for various applications in the paper industry.

Abstract: A process for controlling the deposition of stickies from paper stock suspensions during papermaking by adding to the paper stock suspensions from 0.001% to 5.0% by weight based on the weight of fibrous paper stock, of alkoxylation products obtained by reaction of alkylene oxides with C.sub.10-22 carboxylic acid derivatives or C.sub.10-22 carboxylic acids containing functional groups with at least one OH group in the 9, 10, 13 or 14 position.

Abstract: Methods for inhibiting the deposition of organic contaminants from pulp in pulp and papermaking systems are disclosed. Albumins, globulins or blends thereof and spray-dried animal blood cells are added to the pulp or sprayed onto deposition prone surfaces of a papermaking system suffering from organic contaminants.

Abstract: An improved process for delignification of lignocellulosic raw material, such as wood chips, for the production of cellulose pulps for use in the manufacture of paper or paperboard and an improved pulping aid composition for use in said process are disclosed wherein the wood chips are treated in a closed reaction vessel with an alkaline pulping liquor with an amount of a cyclic keto compound, such as anthraquinone, included therein for achievement of a determined pulp yield, wherein the improvement comprises a reduction in the amount of anthraquinone required to achieve said yield by the addition to said alkaline pulping liquor, in addition to a reduced amount of the anthraquinone, a surfactant mixture comprising at least one alkyl alcohol alkoxylate and at least one polyoxyalkylene glycol ether of an ester of an acid selected from the group consisting of ricinoleic acid and 12-hydroxystearic acid.

Abstract: The present invention relates to the use of oil-in-water emulsions to clean machines and parts of plants in the production of pulp, paper, paper board, and cardboard and to prevent impurities of adhesives and adherent resins to those units.The emulsion comprises as component of the oil phase at least one of the following substances:1. a saturated or unsaturated, open-chain or cyclic, normal or isomeric hydrocarbon with 8-30 carbon atoms2. a saturated or unsaturated fatty alcohol, a saturated or unsaturated fatty acid, a fatty acid monoalkylester, a fatty acid amide or a fatty acid monoalkylamide of a saturated or unsaturated fatty acid, all of the compounds mentioned under 2. having 8 to 30 carbon atoms3. a mono- or polyester of a saturated or unsaturated, mono- or multivalent carboxylic acid with 2 to 30 carbon atoms and polyols, with the exception of polyethylene glycols4. a polyamide of saturated or unsaturated fatty acids with 8 to 30 carbon atoms and aliphatic polyamides with two to six nitrogen atoms5.

Abstract: There is provided a composition comprising tannin containing hydroxyl groups which has been (a) chemically modified by reaction of at least one of said hydroxyl groups with at least one member selected from the group consisting of an esterification agent (e.g. acetic anhydride), etherification agent (e.g. dichloromethane or quaternary organic amine such as N-(3-chloro-2-hydroxypropyl) trimethyl ammonium chloride) to form the corresponding ester, or ether, through said hydroxyl group, and (b) derivatized. The chemically modified tannin is derivatized by reaction with aldehyhde (e.g. formaldehyde), or aldehyde and at least one member selected from the group consisting of ammonia and organic amine containing at least one primary or secondary nitrogen (e.g. cyclohexyl amine); said derivatized tannin being water soluble or dispersable at a pH below 7 and water insoluble at a pH above 7.

Abstract: The invention provides a method for preventing pitch trouble which comprises adding to a pulp slurry a pitch-controlling agent comprising 100 parts by weight of a zinc salt of a higher fatty acid and from 1 to 20 parts by weight of a cationic surfactant.

Abstract: A method for minimizing pitch, ink, and stickies particle deposits in the paper making process by causing the retention of such particles onto fiber, comprising the steps of adding an effective pitch, ink, and stickies controlling amount of talc to a suspension of fiber in contact with the paper machine and associated parts and adding an effective pitch, ink, and stickies controlling amount of bentonite to the suspension, thereby increasing retention of pitch, ink, and stickies onto the fiber and minimizing the deposition of pitch, ink, and stickies particles on the paper machine and associated parts.

Abstract: Compositions and methods for inhibiting the deposition of organic contaminants from pulp in pulp and papermaking systems are disclosed. The methods add to the pulp or to the deposition prone surface of the papermaking system a composition comprising a polyvinyl alcohol having 50 to 100% hydrolysis and a high molecular weight gelatin having a molecular weight of about 100,000 or higher.

Abstract: This invention relates to the treatment of press section felts. The treatment comprises applying to the felts an effective amount of a felt cleaning agent comprising one or more anionic polymers, selected from the group of polycarboxylic acids and derivatives thereof having an average molecular weight of 500 to less than 5000, 2-phosphino-1,2,4-tricarboxybutane, and an amphoteric surfactant selected from the group consisting of alkyl-N-(3 aminopropyl)-glycines and alkyl-di(aminoethyl)-glycines. The cleaning agent inhibits the blinding of paper machine press section felts and provides improved felt conditioning at much lower concentration levels than known commercial products.

Abstract: Compositions and methods for inhibiting the deposition of organic contaminants from pulp in pulp and papermaking systems are disclosed. The methods add to the pulp or to the deposition prone surface of the papermaking systems a composition comprising a dinonyl sulfosuccinate anionic surfactant which is used in systems containing multivalent cations, preferably calcium ions. The methods also utilize a blend of dioctyl sulfosuccinate and didecyl sulfosuccinate anionic surfactants.

Abstract: This invention relates to a liquid composition for the control of pitch deposition in pulp and paper making comprising an aqueous solution of (1) a derivatized cationic guar, and (2) styrene maleic anhydride copolymer.

Abstract: Stickies derived from pulping or deinking of cellulosic material are controlled by adding to the cellulosic liquor containing the stickies an emulsion in water of cross-linked, insoluble, ionisable and swellable polymer particles.

Abstract: Compositions and methods for inhibiting the deposition of organic contaminants from pulp in pulp and papermaking systems are disclosed. The methods add to the pulp or to the deposition prone surface of the papermaking system a composition comprising a polyvinyl alcohol having 50 to 100% hydrolysis, a high molecular weight gelatin having a molecular weight of about 100,000 or higher, and a cationic polymer.

Abstract: The present invention relates to the use of certain fungi in the reduction of the pitch and/or lignin content of cellulosic materials. In particular, the white rot fungi Schizophyllum commune, Trichaptum biforme and Phanerochaete gigantea are useful in reducing pitch and/or lignin, or both, which saves electrical energy during the mechanical refining of pulps and pulpwoods used in making cellulosic products.

Abstract: This invention relates to a liquid composition for the control of pitch deposition in acid pulp and paper making operations comprising a derivatized cationic guar and an alkali metal polyacrylate dispersant. The invention also relates to a process for inhibiting pitch deposition on paper making equipment.

Abstract: Process for fixing anionic interfering substances in papermaking process by the addition of cationic polycondensation products obtained by reactinga) a monofunctional or polyfunctional amine having one or more primary and/or secondary and/or tertiary amino groups withb) cyanamide, dicyandiamide, guanidine or biguanidine, wherein up to 50 mol. % of cyanamide, dicyandiamide or biguanidine may be replaced with a dicarboxylic acid or a mono- or diester thereof, with elimination of ammonia, optionally in the presence of a catalyst,optionally together with other auxiliaries.

Abstract: Addition of a water-soluble polyelectrolyte (i.e. an anionic or cationic polymer) significantly increases the hydrolysis rate of esters in the presence of lipases. The invention provides a process for hydrolysis of water-insoluble ester in the presence of a lipase characterized by the presence of a water-soluble polyelectrolyte. The invention also provides a method of increasing the rate of hydrolysis of water-insoluble ester in the presence of a lipase by incorporation of a water-soluble polyelectrolyte.

Abstract: A method of producing a multi-ply paperboard product. A single aqueous recycled pulp stock which contains both heavy contaminants and lightweight contaminants is separated into three fractions, including a first fraction which contains the heavy contaminants, a second middle density fraction that contains the most desirable fibers, and a third low density fraction that contains the lightweight contaminants. The three fractions are discharged from a multi-channel head box onto a forming fabric, with the middle density fraction constituting the base ply in contact with the forming fabric, the low density fraction being the central ply and the high density fraction being the outer ply, thus forming a multiple-ply paperboard product.

Abstract: A method for the control of pitch in an aqueous system used in pulp or paper making is disclosed which comprises adding to the system, or to the pulp making or paper making machinery, a water soluble polymer derived from (a) an epihalohydrin, a diepoxide or a precursor of an epihalohydrin or diepoxide, (b) an alkyl amine having a functionality with respect to an epihalohydrin of 2 and (c) an amine which has a functionality with respect to an epihalohydrin greater than 2 and which does not possess any carbonyl groups.

Abstract: A process for hydrolysis of water-insoluble esters in the presence of a lipase, at a pH in the range of 3-7 particularly to such a process for hydrolysis of resin in pulp.

Abstract: A process for controlling the deposition of stickies from paper stock suspensions in papermaking involving the steps of: (a) providing a paper stock suspension containing stickies; and (b) contacting the stickies in the paper stock suspension with a native starch.

Abstract: Ascospores of wood-penetrating, pitch-grading fungi of the class of Ascomycotina and Deuteromycotina, eg. Ophiostromas, may be screened to provide fungi combining the properties of good growth on non-sterile wood substrates and minimized or even enhanced brightness effects for use in pitch reduction of wood substrates, eg. logs and wood chips. A new and improved method of isolating such ascospores involving effective suspension in an oil consumable by the fungus, eg. a vegetable oil, and then treatment of the oil with a dispersing agent is also disclosed.

Abstract: This invention relates to fungi having particularly desirable overall properties for reducing the pitch content of pulpwoods and pulps, and to the preparation and use of such fungi. In particular, the present invention provides a biologically pure cultures of the fungus Ophiostoma piliferum which are characterized by not only growing white or colorless and by having good growth virulence, but which also exhibit exceptional pitch degradation properties.

Abstract: Pitch in paper mills is controlled by treating paper mill systems with a water soluble polymer which contains a lower alkyl N-vinyl amide or a hydrolyzed lower alkyl N-vinyl amide.

Abstract: A method for conditioning the felts in a papermaking process utilizing deinked secondary fiber in the furnish by adding a felt conditioner consisting of from 5-33% of a nonionic surfactant, from 5-33% of a dispersant, or blends thereof, with the remainder water; wherein the nonionic surfactant is selected from the group consisting of ethoxylated nonylphenols having moles of ethoxylation of from 7.5 to 30 and an HLB of about 12 to 17.2 and di-alkyl phenol ethoxylates having moles of ethoxylation of from 15 to 24 and an HLB of about 13 to 15.1; and wherein the dispersant is selected from the group consisting of the sodium salt of naphthalene sulfonate formaldehyde-condensate having an average molecular weight of from about 700 to 3500, the potassium salt of polymerized alkyl naphthalene sulfonic acid having an average molecular weight of approximately 1000, or the sodium or ammonium salt of lignosulfonate. Additionally, from 1 to 5% of an alkylether hydroxypropyl sultaine enhances performance.

Abstract: A method of removing and preventing the build-up deposit-forming microorganisms in a papermachine fluid, the method comprising the step of treating the fluid with an aqueous, the aqueous solution including from about 0.1 to about 35 parts per million of an ethylene oxide/propylene oxide copolymer having a molecular weight of from about 2500 to about 3550 daltons.

Abstract: A method of inhibiting the deposition of organic contaminants in a pulp and papermaking system comprising adding to the system an effective amount of a detackifying composition comprising a charged polymer and an oppositely charged surfactant, with the proviso that at least the polymer or the surfactant be surface active.

Abstract: Methods for reducing stickies and removing ink from wastepaper fiber wherein a cationic kaolin is added to a wastepaper fiber furnish under conditions such that the kaolin attaches to the stickies or the ink and the stickies or ink are removed from the furnish using a centrifugal cleaner.

Abstract: Compositions and methods for inhibiting the deposition of organic contaminants from pulp in pulp and papermaking systems are disclosed. The methods add to the pulp or to the deposition prone surface of the papermaking system a composition comprising a polyvinyl alcohol having 50 to 100% hydrolysis and a high molecular weight gelatin having a molecular weight of about 100,000 or higher.

Abstract: A process for beneficiating crude kaolin clay under defined conditions with a sufficient amount and concentration of aluminum chlorhydrate (0.5 to about 5.0 active wt. %) to improve the clay's ability to adsorb pitch during the process of making paper. The invention also relates to the treated clay and to the use of the clay in a papermaking process to absorb pitch and/or anionic trash.

Abstract: A method for controlling pitch in papermaking systems which comprises the step of adding a water-soluble, silicon-containing polyelectrolyte copolymer coagulant to pulp and paper process water. The water-soluble, silicon-containing polyelectrolyte copolymer coagulant preferably comprises diallyldimethyl ammonium chloride and a vinyl alkoxysilane.

Abstract: This invention relates to an improved press felt conditioning treatment which controls the deposition of poly(aminoamide)--epichlorohydrin type resins in a press felt. The treatment comprises applying to the felt an effective inhibiting amount of a conditioner comprising: an ethoxylated nonylphenol having greater than about 30 moles of ethoxylation; sodium n-hexadecyl diphenyloxide disulfonate; a fatty acid imidazoline or an alkylamidopropyldimethylamine which include an alkyl hydrophobe substituent having a carbon chain length of about 18.

Abstract: A process for cooking wood to pulp by contacting the wood with a deresinating agent containing fatty acid esters of polyoxyalkene glycols priors to cooking the wood with an alkaline liquor to simultaneously reduce pulp rejects and increase pulp yield.

Abstract: Hydrolyzed copolymers of (A) maleic anhydride with (B) at least one mono-ethylenically unsaturated monomer other than acrylic acid or methacrylic acid or with a mixture of (B) and (C) acrylic acid or methacrylic acid are effective for inhibiting the formation of calcium carbonate scale in wood pulp production.

Abstract: A method for controlling, inhibiting the deposition of and/or for removing stickies from the surfaces of pulping and papermaking machinery in secondary fiber operations by adding an effective amount of a melamine formaldehyde-type polymer to a pulp slurry or furnish containing secondary fiber that is in contact with said machinery. Improved paper end products resulting from this method are also disclosed.

Abstract: Adhesive contaminants in secondary fiber paper pulps are detackified by the use of a water soluble terphthalate glycol terpolymer.

Abstract: Diallyl dimethyl ammonium chloride/3-acrylamido-3-methyl-butanoic acid copolymers were prepared and found to be effective pitch control agents in papermaking systems.

Abstract: A method for the control of pitch in a pulp is characterized in that the method comprises sequentially adding to and mixing with the pulp (1) 1-10 Kg/tonne of pulp of a low molecular weight, high cationic charge, polymeric, water-soluble species, such as those derived from inorganic aluminium salts or quaternary polyamines, and (2) 0.5 to less than 10 Kg/tonne of pulp of montmorillonite clay particles, such as bentonite, which clay particles may be chemically modified to improve adsorption capacity or otherwise treated to increase the anionic charge density of the dispersion but which do not have a water-soluble cationic polymer associated therewith.

Abstract: A method for controlling or inhibiting the deposition of pitch derived from aqueous pulp suspensions having a neutral or cationic soluble charge onto paper machine equipment surfaces which contact the pulp, comprising a) contacting the pulp with an anionic polymer in an amount sufficient to maintain an anionic charge in the pulp and b) contacting the paper machine equipment surfaces with a cationic polymer in an amount sufficient to inhibit the deposition of pitch deposits thereon.

Abstract: Accumulation of pitch or stickies in pulp or paper making is controlled by applying to the pulp or paper making equipment which is not in continuous contact with water separately a water soluble cationic polymer and a water soluble anionic polymer.

Abstract: A method of inhibiting the deposition of organic contaminants in a pulp and papermaking system comprising adding to the system an effective amount of a detackifying composition comprising a charged polymer and an oppositely charged surfactant, with the proviso that at least the polymer or the surfactant be surface active.

Abstract: The present invention relates to a process for trash removal or pitch control in the paper manufacture, in which process as agent for the trash removal or pitch control cationic groups containing polymers of 50 to 100%-wt. quaternized dimethylaminopropylmethacrylamide or dimethylaminopropylmethacrylamide and 0 to 50%-wt acrylamide, acrylic acid, methacrylic acid, acrylamidomethylpropanesulfonic acid, are used, which polymers have an intrinsic viscosity of smaller than 150 ml/g. The trash removal or pitch control agent is added to the pulp flow and/or the circuit water in amounts of up to 1%-wt., relative to the dry weight of the paper manufactured.