EP1977040A2 - Procédés de fabrication de papier utilisant des agents coagulants et des azurants optiques - Google Patents

Procédés de fabrication de papier utilisant des agents coagulants et des azurants optiques

Info

Publication number
EP1977040A2
EP1977040A2 EP07716938A EP07716938A EP1977040A2 EP 1977040 A2 EP1977040 A2 EP 1977040A2 EP 07716938 A EP07716938 A EP 07716938A EP 07716938 A EP07716938 A EP 07716938A EP 1977040 A2 EP1977040 A2 EP 1977040A2
Authority
EP
European Patent Office
Prior art keywords
pulp
paper
starch
charged
present
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07716938A
Other languages
German (de)
English (en)
Inventor
Gary A. Headrick
Alan B. Rosenberg
Rosa M. Covarrubias
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Buckman Laboratories International Inc
Original Assignee
Buckman Laboratories International Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Buckman Laboratories International Inc filed Critical Buckman Laboratories International Inc
Publication of EP1977040A2 publication Critical patent/EP1977040A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/30—Luminescent or fluorescent substances, e.g. for optical bleaching
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/28—Colorants ; Pigments or opacifying agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/28—Starch
    • D21H17/29—Starch cationic
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/04—Addition to the pulp; After-treatment of added substances in the pulp
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/04—Addition to the pulp; After-treatment of added substances in the pulp
    • D21H23/06—Controlling the addition
    • D21H23/14—Controlling the addition by selecting point of addition or time of contact between components

Definitions

  • the present invention relates to papermaking processes and products made from these processes. More particularly, the present invention relates to treating papermaking pulp with at least one charged starch, such as cationically-charged starches, and one or more optical brighteners.
  • Optical brighteners or optical brightening agents (OBAs) and Fluorescent Whitening Agents (FWAs) are typically used in certain papermaking processes in order to increase or improve the brightness of paper or paperboard and/or to increase or improve the paper fluorescence intensity.
  • OBA/FWA products may be added at the size press with other additives. Other certain OBA/FWAs may be added in the wet end of the paper making process.
  • the present invention relates, in part, to increasing the retention and/or the efficiency of OBAs/FWAs, whether present from wet end addition of OBA or OBA present in the broke (contains recycled paper), as well as not quenching or dulling the impact of OBA from any source, on the paper machine and in the final sheet of paper.
  • Many consumers prefer paper with a high brightness, and the brightness of the paper is typically promoted as one important parameter to consumers of paper products.
  • In order to achieve the brightness in paper especially papers having a high brightness, such as over 80%, one or more optical brighteners or optical brightening agents are added during the papermaking process. These optical brighteners can be quite expensive and raise the overall cost of the paper product. This can be seen by any consumer purchasing paper.
  • optical brightening agents are added to the wet end process, or to the size press or to both the wet end and to the size press within the papermaking process.
  • coagulants and flocculants are further used during the papermaking process in order to obtain desirable pulp characteristics, paper characteristics, and paper machine retention and runnability.
  • coagulants neutralize system charge and assists the pulp fibers, fines, fillers and functional additives to electrostatically coagulate together retaining them in the sheet and to form a more uniform paper product.
  • coagulants include polyaminoamido glycol, polyethylene imine, polyamine, polydadmac, alum and polyaiuminum chloride. While coagulants are necessary to produce paper having suitable characteristics, many of these coagulants, unfortunately, ' affect in a negative way, the optical brighteners previously added.
  • the coagulants are also typically added at the wet end stage of the papermaking process either to a thick stock or a thin stock feed location.
  • a feature of the present invention is to provide a method of making paper or paperboard which preferably does not dull the effects of optical brightening agents.
  • a further feature of the present invention is to provide a method which permits the reduction in the amount of optical brightening agents and yet achieves satisfactory brightness and/or paper fluorescence intensity in the paper or paperboard.
  • the present invention relates to a method of making paper or paperboard which involves introducing at least one ionically-charged starch (preferably with a degree of substitution above 0.045) and at least one optical brightening agent to a papermaking pulp to form a treated pulp.
  • the treated pulp can then be formed into a paper or paperboard product.
  • the ionically-charged starch and the optical brightening agent can be added in any order.
  • the starch can be added to the thin stock and the optical brightening agent can be added to the thick stock, the OBA can be added to the thin stock, thick stock, or both, and/or the starch can be added to the thin stock, thick stock, or both.
  • the present invention further relates to a method of improving optical brightener performance by using at least one ionically-charged starch (preferably with a degree of substitution above 0.045) and at least one optical brightening agent and adding these components to a papermaking pulp to form a treated pulp and then forming the treated pulp into a paper or paperboard.
  • at least one ionically-charged starch preferably with a degree of substitution above 0.045
  • at least one optical brightening agent preferably with a degree of substitution above 0.045
  • the present invention further relates to paper or paperboard which can be obtained by one or more of the methods of the present invention.
  • FIGs. 1 and 2 are flow charts showing a papermaking process according to one or more embodiments of the present invention.
  • Fig. 3 is a bar graph comparing various hand sheet samples with optical brightening agents with or without cationic starches and measuring the resulting ISO brightness.
  • Fig. 4 is a photograph showing the fluorescence image of various hand sheet samples which contain an optical brightening agent with or without a cationic starch.
  • the present invention provides methods of making paper or paperboard that use one or more optical brightening agents during the papermaking or paperboard making process.
  • papermaking pulp will refer to pulp that can be made into paper or paperboard products.
  • one or more ionically-charged starches such as cationic starch or starches preferably having a degree of substitution greater than 0.045, are added to the papermaking pulp along with at least one optical brightening agent.
  • the ionically-charged starch can be added to the pulp separately or in any combination.
  • Paper and paperboard products made according to the methods of the present invention preferably exhibit increased paper brightness and/or paper fluorescence intensity compared to the same paper and paperboard being made by the same process but without the presence of cationic starch, having a degree of substitution greater than 0.045, and added to the wet end of the paper machine system.
  • the ionically-charged starch and the optical brightening agent can be added in any order of introduction, such as fed one after another into the papermaking pulp.
  • the optical brightening agent and the starch can be added at the same stage of the papermaking process or it can be added at different stages of the papermaking process, as long as both (juii ⁇ uc ⁇ ts are added prior to the size pressing stage of a papermaking process.
  • the two components can be added within 50 minutes of each other, within 40 minutes of each other, within 20 minutes of each other, within 10 minutes of each other, or within 5 minutes of each other, or within 2 minutes of each other, or within 1 minute of each other, or even within seconds of each other into the pulp.
  • the starch is an ⁇ onically-charged starch which is preferably a cationicaily- charged starch or cationic starch, preferably having a degree of substitution greater than 0.045.
  • the charged state of the starch refers to the overall net charge of the starch.
  • Two or more charged starches can be used, such as two or more cationic starches.
  • the starches can be added as a pre-blended composition, or they can be added at the same time, sequentially, or in any order to the pulp, alone or in combination with one or more optical brightening agents.
  • one of the starches can be a neutral starch.
  • At least one of the charged starches has a degree of substitution ranging from about 0.045 to about 0.5, such as from about 0.07 to about 0.45 or from about 0.10 to about 0.40, or from about 0.15 to about 0.4. Other degrees of substitution above and below these ranges can be used. Generally, a degree of substitution above 0.045 is preferred and can be used. The degree of substitution can be above 0.4 and higher degrees of substitution will benefit the present invention.
  • Preferred cationic starches include, but are not limited to, potato starches, corn starches, and other wet-end starches, or combinations thereof.
  • cationic starches that can be used in the present invention include, but are not limited to BUFLOC 5521 and BUFLOC 5567 products, both available from Buckman Laboratories International, Inc., Memphis, Tennessee. Other examples include, but are not limited to, Raifix, Raisiobond, and products supplied to the industry by CD3A.
  • optical brightening agents can be used, such as two or more or three or more.
  • optical brightening agents include fluorescent whitening agents.
  • optical brightening agents are typically chemicals which are used to purify and/or increase the visible whiteness or brightness of paper fibers.
  • Optical brightening agents can also be optical whitening agents and can include water-soluble dyestuffs.
  • the optical whitening agents can be fluorescence dyes that absorb invisible UV light from daylight and re-emitted in the visible spectrum, thus enhancing the brightness with excellence of whiteness on the paper.
  • optical brightening agents When two or more optical brightening agents are used, as with the starch, they can be added as a pre-blend, sequentially, or in any order to the pulp.
  • General classes of optical brightening agents include stilbenes, derivatives of stilbenes, distyrlbiphenyls, triazinylamino stilbene, and the like.
  • an optical brightening agent includes tinting agents.
  • OBAs include stilbene disulfonate, stilbene tetrasulfonate, stilbene hexasulfonate, 4,4' diamine stilene, 2,2' disulphonic acid, or stilbene derivatives. The OBAs described in U.S. Patent Nos.
  • optical brightening agents include, but are not limited to, Blankophor, Leucophor, Tinopal, Catowhite OWA grades, Unipal, Pal ⁇ nil Brilliant White, Uvitex, Milkawhite, Fluolite, Kalbrite, OBA-C and W.
  • the preferred amount of the ionically-charged starch can be any amount effective to permit an improved optical brightener performance, such as improvement with respect to paper ISO brightness and/or paper fluorescence intensity.
  • the ionic starch such as cationic starch, can be added in an amount of from about 0.25 to about 25 pounds per ton of dried pulp or a dry solids basis, or from about 1.0 pound to 20 pounds per ton of dried pulp on a dry solids basis, and more preferably from about 1 pound to about 6 pounds per ton of dried pulp on a dry solids basis.
  • optical brightening agents With respect to the optical brightening agents, conventional amounts are used, such as from about 1 pound to about 50 pounds per ton of dried pulp, and more preferably from about 2.0 to about 10.0 pounds per ton of dried pulp on a dry solids basis.
  • this process is preferably used when making Fine paper or paper that is coated or non-coated free-sheet, newsprint, specialty newsprint, supercalendered (SC), and light weight coated (LWC) grades.
  • Non-coated free sheet paper is made from freely draining stock. Coated free sheet is a publication grade in which the coating raw stock generally contains no more than 10% by weight mechanical pulp.
  • Supercalendered (SC) is off machine calendaring paper utilizing a stack having alternating chilled iron fiber rolls.
  • LWC is coated papers of relatively low grammage.
  • Newsprint machine-finished paper is composed mainly of mechanical pulp, commonly used for printing newspapers.
  • the starch and brightening agent are introduced at or prior to the pulp entering a blend chest.
  • the optical brightening agent and starch can be added at or prior to the pulp entering a machine chest.
  • the starch and the optical brightening agents can be added to the pulp prior to the size pressing.
  • the starch and the optical brightening agent can generally be added at any location of the paper making process and can be added prior to the Whitewater silo in a paper making process or can be added prior to the machine chest or can be added prior to the blend chest or can be added prior to or after the first refiner.
  • the method of the present invention can be practiced on conventional paper making machines with modifications that can be easily made in view of the present invention.
  • the method can employ many different types of paper making pulp or combinations thereof.
  • the pulp may comprise virgin and/or recycled pulp, such as virgin sulfite pulp, broke pulp, a hardwood kraft pulp, a softwood kraft pulp, mixtures of such pulps, and the like.
  • An enzyme composition can be optionally used for treating the pulp and may contain any conventional paper making pulp-treating enzyme that has cellulytic activity.
  • Other conventional paper-making components can be present as long as these other components do not negatively affect the starch, or optical brightening agent.
  • the enzyme composition also exhibits hemicellulytic activity.
  • Suitable enzymes and enzyme-containing compositions include those described in U.S. Pat. No. 5,356,800 to Jaquess, U.S. Patent Application No. 09/031,830 filed Feb. 27, 1998, and International Publication No. WD 99/43780, all incorporated herein in their entireties by reference.
  • the cellulytic enzyme composition preferably contains from about 5% to about 20% by weight enzyme.
  • the preferred enzyme composition can further contain polyethylene glycol, hexylene glycol, polyvinylpyrrolidone, tetrahydrofiiryl alcohol, glycerine, water, and other conventional enzyme composition additives, as for example, described in U.S. Pat. No. 5,356,800.
  • the enzyme may be added to the pulp in any amount, such as from about 0.001 to about 0.100% by weight enzyme based on the dry weight of the pulp, for example, from about 0.005 to about 0.05% by weight.
  • the enzyme composition contains at least one polyamide oligomer and at least one enzyme.
  • the polyamide is present in an effective amount to stabilize the enzyme.
  • Exemplary enzyme compositions containing polyamide oligomers and enzymes are described in International Published Application No. WO 99/43780, which is incorporated herein in its entirety by reference.
  • the enzyme composition can include a combination of two or more different enzymes.
  • the enzyme composition can include, for example, a combination of a lipase and a cellulase, and optionally can include a stabilizing agent.
  • the stabilizing agent may be a polyamide oligomer as described herein.
  • a microparticle additive may be added to the pulp at any time during the process.
  • the microparticle additive can modify the charge of the pulp or the charge of a component of the pulp.
  • the microparticle additive can be, for example, a charging or modifying agent, a filler, a coagulating agent, and/or a retention aid.
  • the microparticle additive can be a natural or synthetic hectorite, bentonite, zeolite, alumina sol, silica or any of conventional particulate additives as are known to those skilled in the art.
  • a biocide may be added to the pulp or treated pulp in accordance with conventional uses of biocides in paper making processes. For example, a biocide may be added to the treated pulp in a blend chest.
  • Biocides useful in the paper making pulps according to the present invention include biocides well known to those skilled in the art, for example, BUSAN®1 130, available from Buckman Laboratories International, Inc., Memphis, Tenn.
  • FIG. 1 A flow chart of a paper making system for carrying out the method of the present invention is set forth in FIG. 1. It is to be understood that the system shown is exemplary of the present invention and is in no way intended to restrict the scope of the invention.
  • a supply of starch and a supply of optical brightening agent (OBA) are added at desired respective concentrations with a flowing stream of paper making pulp to form a treated pulp at any part of the front end of the wet process as shown.
  • the supply of pulp shown represents a flow of pulp, as for example, supplied from a pulp holding tank or silo.
  • the supply of pulp shown in FIG. 1 can be a conduit, holding, or mixing tank, or other container, passageway, or mixing zone for the flow of pulp.
  • the supply of starch or OBA can be, for example, a holding tank having an outlet in communication with an inlet of the treated pulp tank.
  • the pulp treated with the starch and OBA can be passed from the treated pulp tank through a refiner, and then through a blend chest where optional additives including a biocide can be combined with the treated pulp.
  • the refiner has an inlet in communication with an outlet of the treated pulp tank, and an outlet in communication with an inlet of the blend chest.
  • the pulp treated in the blend chest is passed from an outlet of the blend chest through a communication to an inlet of a machine chest.
  • the blend chest and machine chest can be of any conventional type known to those skilled in the art.
  • the machine chest ensures a level head, that is, a constant pressure on the treated pulp or stock throughout the downstream portion of the system, particularly at the head box.
  • a cationic starch and/or OBA are added to the refined treated pulp at the blend chest or up to the stufFbox, and the system includes a conventional stuff box. Additional cationic starch may be added at the stuff box although not depicted in FIG. 2.
  • the system of FIG. 2 has a second refiner between the machine chest and the stuff box.
  • Other additives including pH adjustment agents such as alum, may also be added at the stuff box. pH adjusting agents can be added at other points along the flow of pulp or treated pulp through the apparatus.
  • the apparatus of the present invention can also include metering devices for providing a suitable concentration of the OBA to the flow of pulp, for example, from about 0.05 to about 2.5 percent by weight OBA, based on the dried solids weight of the pulp.
  • the apparatus can include a metering device for providing a suitable amount of the cationic starch to the flow of pulp, for example, from about 0.05 percent to about 1.5 percent by weight cationic starch, having a degree of substitution preferably greater than 0.045, based on the dried solids weight of the pulp.
  • Other metering or dosing devices are preferably provided for the other additives and ingredients that may be used during the method.
  • a cleaner for example, a centrifugal force cleaning device, can be disposed between, for instance, the fan pump and the screen, according to any of the embodiments of FIGS. 1-2 above.
  • the present invention further relates to a method of improving optical brightener performance by practicing one of the embodiments of the methods of the present invention which includes introducing at least one ionically-charged starch, such as cationic starch, and at least one optical brightening agent to a papermaking pulp to form a treated pulp and then forming the treated pulp into paper or paperboard.
  • the improved optical brightener performance includes an increase in paper ISO brightness and/or an increase in paper fluorescence intensity. These increases are compared to the same method using the same amount of optical brightening agents compared to the same method using the same amount of optical brightening agents, but without any charged starch and/or any starch being added prior to the size pressing.
  • the present invention provides a method to avoiding the quenching of the optical brightening agent and/or retains the color or brightness achieved by using optical brightening agents.
  • the improvement in optical brightener performance can be measured by either paper ISO brightness or paper fluorescence intensity and can be on the order of at least 5% or more, such as 10% or more, or from about 5% to about 25% compared to the same paper being made in the same process with the same OBAs and amounts but without any charged starch being used prior to the size pressing.
  • the present invention can further achieve, as an option, excellent filler retention, such as PCC, T1O 2 , clay, and the like. Further, higher ash retention is achieved, and can even be achieved with a decrease in filler amounts used in view of the ability of the present invention to increase the retention rate. Also, with the present invention, it is possible to achieve a reduced amount of sheet defects, such as measured by ULMA defects. Particularly, less dusting, for instance, in the early section of the dryers, can be achieved, holes reduced in all categories can be achieved (e.g., reduction in small holes, reduction in medium holes, reduction in small light spots).
  • the present invention can improve one or more of the following properties:
  • the improvement can be on the order of at least 2%, at least 5% or more, such as 7% or more, 10% or more, 25% or more, 50% or more, 75% or more, 100% or more, such as from 2% to 100%, from 5% to 75%, from 10% to 50%, and any ranges or values within these ranges, wherein the percent improvement is compared to the same paper being made in the same process with the same OBAs and amounts, but without any charged starch being used prior to the size pressing.
  • the particular numerical improvements detailed in the examples can be achieved herein, in general, with respect to other embodiments of the present invention, meaning other OBAs, other charged starches, and/or process conditions.
  • the present invention further relates to pulp and paper obtained from the present invention.
  • the present invention relates to a pulp or pulp slurry containing pulp, one or more optical brightening agents, and at least one cationic charged starch, preferably having a degree of substitution of greater than 0.045.
  • the charged starch can have any degree of substitution described above.
  • the amounts can be the amounts described above.
  • the pulp can further contain other conventional ingredients, such as at least one filler, at least one biocide, at least one microparticle, at least one enzyme, at least one polymer, other starches, or any combinations thereof.
  • the present invention relates to a paper or paperboard obtained from the present invention.
  • the paper or paperboard can be any type of paper, such as the paper grades mentioned above, and the paper or paperboard contains pressed cellulose fibers, at least charged starch, preferably having a degree of substitution of greater than 0.045, and at least optical brightening agent.
  • the degree of substitution for the charged starch, such as a cationic starch, can have the various degrees of substitution mentioned earlier.
  • the paper can be fine paper or paper that is coated or non-coated.
  • the paper can be newsprint, specialty newsprint, super calendared, or light-weight coated grades.
  • the paper made from the pulp can be from recycled and/or virgin pulp.
  • the pulp suspension used in this example contained 70% by weight bleached hardwood and 30% by weight bleached softwood with a CSF of 380 mL.
  • Optical brightener used was Tinopal.
  • Both BFL 5521 and BFL 5567 were cationic starches with different charge densities.
  • FIG 4 shows the fluorescence image of the prepared paper samples.
  • small paper pieces were cut from the handsheets and taped on the fluorescence lamp. The picture was taken in a dark 1 room using a digital camera.
  • the introduction of cationic starches increased the fluorescence intensity (samples 3 and 5).
  • the samples with higher cationic starch dosages (samples 4 and 6) displayed higher fluorescence intensity.
  • cationic starches such as BFL 5521 and BFL 5567 starch compositions, improved optical brightener performance by increasing both the paper ISO brightness and the paper fluorescence intensity (excited by UV).
  • a cationic starch pursuant to the present invention, was present in the wet pulp in an amount of 4 pounds per ton of dried pulp based on a dry solids basis. Both of these cationic starches are available from Buckman Laboratories International. The remaining four samples contained a conventional coagulant in the pulp, namely polyamine or polyDMDAAC, in an amount of 2 pounds per ton or 4 pounds per ton of dried pulp based on a dry solids basis.
  • BUFLOC 5567 organic coagulant was used. More specifically, BUFLOC 5567 coagulant was introduced into the thin stock stage starting at an amount of 0.5 lb/ton, which was gradually increased to 2 lb/ton, and then increased to 3 lb/ton, and then increased to 4 lb/ton for the remainder of the trial. The dosage was then decreased by 1 lb/ton every reel until the trial was finished.
  • the brightness and fluorescence level were not significantly effected through the use of the BUFLOC 5567 coagulant.
  • the average brightness from one week before and one week following the experiment was 91.8 and the average fluorescence was 2.4.
  • the average brightness was about 91.3 and the fluorescence was about 2.2.
  • the optical brightening agent usage significantly dropped and yet, average brightness and average fluorescence were maintained as described above. More specifically, prior to the experiment, the OBA usage was around 750-950 ml/m per side. However, during the experiment with the use of BUFLOC 5567, a significant reduction in OBA was obtainable.
  • the OBA used during the experiment was around 450-550 ml/min. to meet optical specifications. This is an overall reduction of approximately 500-700 ml/min.
  • the hardwood level chest based loading remaining constant at about 0.73 pounds per ton.
  • the amount of OBA can be significantly reduced and yet brightness levels and fluorescence levels maintained at acceptable levels.
  • the charged starch coagulant can be used in all grades of paper to improve brightness and fluorescence efficiency, as well as improve retention, drainage, de-watering, and/or formation. Further, as shown in the studies, the use of charged starch coagulant significantly improved the retention and distribution of fillers and other functional additives while reducing dusting, linting, sheet defects, and/or holes, and allows superior paper machine runability and sheet quality.

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Abstract

L'invention concerne un procédé de fabrication de papier ou de carton. Ce procédé consiste à introduire dans une pâte à papier au moins de l'amidon chargé, présentant de préférence un degré de substitution supérieur à 0,045, et au moins un azurant optique, puis à transformer la pâte en papier ou en carton. L'invention concerne en outre des procédés pour améliorer l'efficacité des azurants optiques.
EP07716938A 2006-01-25 2007-01-24 Procédés de fabrication de papier utilisant des agents coagulants et des azurants optiques Withdrawn EP1977040A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US76191306P 2006-01-25 2006-01-25
PCT/US2007/001806 WO2007087320A2 (fr) 2006-01-25 2007-01-24 Procédés de fabrication de papier utilisant des agents coagulants et des azurants optiques

Publications (1)

Publication Number Publication Date
EP1977040A2 true EP1977040A2 (fr) 2008-10-08

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EP07716938A Withdrawn EP1977040A2 (fr) 2006-01-25 2007-01-24 Procédés de fabrication de papier utilisant des agents coagulants et des azurants optiques

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Country Link
US (1) US20070169903A1 (fr)
EP (1) EP1977040A2 (fr)
JP (1) JP2009524749A (fr)
CN (1) CN101375000A (fr)
AU (1) AU2007208302A1 (fr)
BR (1) BRPI0706958A2 (fr)
CA (1) CA2637192A1 (fr)
WO (1) WO2007087320A2 (fr)
ZA (1) ZA200805441B (fr)

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US20070169903A1 (en) 2007-07-26
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CA2637192A1 (fr) 2007-08-02
CN101375000A (zh) 2009-02-25
WO2007087320A2 (fr) 2007-08-02
BRPI0706958A2 (pt) 2011-04-12
WO2007087320A3 (fr) 2007-09-20
JP2009524749A (ja) 2009-07-02

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