WO1999016972A1 - Amelioration de la resistance du papier par traitement au silicate/amidon - Google Patents

Amelioration de la resistance du papier par traitement au silicate/amidon Download PDF

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Publication number
WO1999016972A1
WO1999016972A1 PCT/CA1998/000915 CA9800915W WO9916972A1 WO 1999016972 A1 WO1999016972 A1 WO 1999016972A1 CA 9800915 W CA9800915 W CA 9800915W WO 9916972 A1 WO9916972 A1 WO 9916972A1
Authority
WO
WIPO (PCT)
Prior art keywords
paper
starch
silicate
board
composition
Prior art date
Application number
PCT/CA1998/000915
Other languages
English (en)
Inventor
Gerard Le Fevre
Hanuman Prasad Didwania
R. Graham Hagens
Original Assignee
National Silicates Ltd.
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 National Silicates Ltd. filed Critical National Silicates Ltd.
Priority to AU92494/98A priority Critical patent/AU9249498A/en
Publication of WO1999016972A1 publication Critical patent/WO1999016972A1/fr

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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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/64—Alkaline compounds
    • 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
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • D21H17/68—Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays
    • 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
    • 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
    • D21H23/22—Addition to the formed paper
    • D21H23/24—Addition to the formed paper during paper manufacture
    • D21H23/26—Addition to the formed paper during paper manufacture by selecting point of addition or moisture content of the paper
    • D21H23/28—Addition before the dryer section, e.g. at the wet end or press section

Definitions

  • This invention relates to compositions for the improvement of strength of cast cellulosic mats.
  • the production of paper, paperboard and other cellulosic fibre mats is usually accomplished via the formation of cast cellulosic mats on a moving table or cylinder.
  • an aqueous slurry of cellulose fibres is spread onto the table, also known as the "wire" or rotating cylinder, and is transformed into a mat by removal of much of the water from the fibres by suction.
  • this mat is converted into paper or board by pressing and drying of the fibre mat.
  • a priority in the manufacture of much paper and paperboard is the strength of the product . While the long fibres present in virgin fibre derived from wood have adequate strength properties for most commercial applications, paper manufactured from fibres which have been previously used commonly exhibits lower strength due to damage caused to the fibres during the recycling process. The recent trends to employ increasingly large quantities of recycled fibres in paper products has led to a significant decline in the strength of many different types of paper products . Although the loss of strength of such papers can in some cases be countered by the utilization of larger quantities of virgin fibre, this is not always economically desirable, virgin fibres being very much more expensive than those derived from used paper such as old cardboard cartons, newspapers and the like.
  • alkali silicates are such that they cannot be retained in paper without the use of excessive quantities of retention aids, the amount being so high as to make the process economically unattractive.
  • retention aids are only partially effective even when used in high quantities. As a result of this, not all the alkali silicate is retained, and significant quantities travel through the sheet into the "white water system" where their interaction with other chemicals negatively affects the chemical balance of the paper machine .
  • An alternate method for the incorporation of chemicals into paper involves a size press. With this piece of equipment, usually located near the middle of the drier section of a paper machine, liquid chemicals can be well dispersed and retained within the paper. This method is widely used for the addition of starch sizing agents to paper, and sodium silicate has also been added to paper at the size press .
  • the main drawback with size presses involves their efficiency. Relatively low quantities of chemicals can be applied by this method, and if the addition of larger amounts (more than 3-4% by weight) the paper machine has to be slowed down which results in a loss of production output. The rate of absorption of the chemicals by the paper is not instantaneous. For these reasons incorporation of chemicals via the size press frequently leads to a reduction in machine speed and output which significantly reduces the cost advantages of using the chemicals.
  • the third method of incorporating chemicals into paper involves soaking, dipping, wiping or mechanically impregnating the paper after it has emerged from the driers .
  • Such techniques are amenable for use with liquids such as sodium silicate, they all suffer from the drawback that the production rate is limited by the need to slow the process for the adsorption of the chemicals, after which the treated paper has to be redried. This results in processing costs, and the need for space for the extra driers which may not always be available .
  • alkali silicates are typically manufactured in a high temperature furnace in which sand and alkali source are fused together.
  • Various types of product are possible depending on the alkali component, sodium and potassium being the most common, and the weight ratio of sand to alkali.
  • the anhydrous product of this reaction finds commercial use either in the dry form, for which applications it is usually ground to a fine powder, or it is dissolved in water to produce an aqueous solution.
  • silicates To date all attempts to incorporate silicates into paper have involved various aqueous solutions of this product, those of sodium silicate being the most common for reasons of cost .
  • the invention here described discloses the development of a class of alkali silicates with precisely defined solubility and particle size characteristics to achieve the desired silicate solubility properties. We have discovered that these results can be achieved by achieving the correct balance between solubility and particle size of sodium silicate in the solid form.
  • the preferred products are a sub-class of a type of partially hydrated alkali silicate obtained by spray drying aqueous solutions of sodium silicate which are commercially available under the trade names Silicate G ® , GD ® and Britesil, all manufactured by the PQ Corporation.
  • the present invention is not intended to be limited to this class of silicate, however, for the approach could also be extended to other dry forms of silicate, such as sodium metasilicate, both anhydrous and pentahydrate, and to the ground glasses of sodium and potassium silicate.
  • the preferred solubility characteristics are found to be obtained by modification of the properties of a partially dried solution of a 3.2 silica to alkali ratio of sodium silicate, one form known as Silicate G ® .
  • Silicate G ® As will be illustrated in the Examples below, the speed at which Silicate G ® has almost the ideal combination of properties required for this application, and that only minor modifications in the process used to manufactured Silicate G ® are required to make it perfectly acceptable for this application.
  • Silicate G ® containing moisture in the range of about 10 to 15% by weight has been found to be suitably insoluble in lukewarm water, and rapidly soluble in hot water to achieve the performance required.
  • the properties of the dried silicate such as those described, can be manipulated by modification of both particle size and moisture content in order to achieve the desired properties for the conditions of the paper machine under consideration. It is also recognized that other factors present during the manufacture of dried silicates, such as the dwell time and temperature in the drier affect the properties of the product. Accordingly, this invention is not limited to the specific methods of manufacture of these products which are its currently preferred embodiments .
  • a third aspect of this invention stems from the discovery that dry forms of sodium silicate can be combined with starch in the applications described.
  • starch as an additive for the strength improvement of paper is well known and of widespread application.
  • Modified, siloxane-containing starch derivatives have been described as strength-enhancing additives, in U.S. Patent No. 4,973,680 (Billmers) .
  • the invention concerns the improvement in the strength properties of cellulosic products such as paper or board by incorporation of sodium silicate in particulate form either alone, or in combination with certain other particular materials such as starch.
  • the chemicals are applied to the surface of the moving wet web on a fourdrinier forming table, although this process is not limited to fourdrinier machines but can also be applied to other paper making processes such as cylinder machines. Addition of these chemicals can be accomplished by a number of application techniques well known in the art and include spray showers, overflow weirs, or die applicators, as described in U.S. Patent No. 5,792,317 (Taylor et al . )
  • the precise location of the application point on the paper machine is also of importance in this process. Since the consistency of fibres on a paper machine increases from about 1% near the head box, to about 15% immediately prior to the press section after which the paper enters the driers . In order to maximize the retention and dispersion of the chemicals within the sheet, it is preferable to add the chemicals to the moving web of the paper machine at a position where the wet mat has a solids content between about 2 and 10% . Application of the products much before this point results in poor retention, while addition of chemicals to a mat of much higher than about 8% consistency results in accumulation of the chemicals on the surface. This is to be avoided because of various deleterious consequences such as the transfer of the chemicals to machinery during drying, as well as later processing.
  • the treatment process can also be applied on those paper machines which manufacture multiply paper in which the wet mats from two or more head boxes are brought together usually immediately prior to the press section, during the manufacture of multiply paper or laminates.
  • the excellent retention of the particles between the plies which is achieved by application at the point of convergence of the mats as described in this process, eliminates concerns about transfer of the product to downstream processes such as drying and printing.
  • Table 1 demonstrates very clearly the relationship between water content and dissolution rate.
  • the alkali silicate used here was a solution of the sodium salt of silicic acid in which the ratio of silica to soda was 3.2:1 (sold by the PQ corporation under the commercial name Silicate N ® ) .
  • the silicate was mixed into a dispersion of unbleached kraft fibres at the concentrations shown, the consistency of the fibres being 1% by weight of water. After twenty seconds the coagulant was added at the level of 1% by weight of the fibres, followed by the flocculent at a level of 0.1% by weight of fibres . After another twenty seconds the handsheet was prepared for testing under standard conditions, the amount of silicate retained in the treated sheets being determined by analysis. The Mullen burst and Short Span Compression Strength (also known as STFI) strength of the treated samples and controls were determined at 50% humidity, 23°C. To correct for the variation in the individual sheet weights due to addition of the chemicals, the results shown in Table 2, have been normalized to 205 g/m 2 .
  • Silicate G ® Use of Silicate G ® to increase the strength of paper under laboratory conditions designed to mimic a paper machine
  • the additive feed rate was adjusted to between 12 and 18 US gal/min in order to achieve the retention shown below.
  • Starch alone was added at the start of the trial, after which a mixture of silicate and starch was applied. Although there was some variation over the course of the trial , the average amount of material retained on the sheet was about 3% w/w, and the average starch: silicate ratio was 4:1 (dry basis) .
  • Table 6 compare the STFI values obtained on the treated edge of the paper with that portion of the sheet which did not receive any chemicals.

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Paper (AREA)

Abstract

L'invention concerne des compositions de silicate alcalin anhydre utilisées comme adjuvants dans la fabrication de papier ou carton classique pour conférer une résistance sensiblement améliorée du papier ou du carton. La granulométrie et la teneur en eau des compositions de silicate alcalin anhydre selon l'invention sont sélectionnées de manière que ces compositions soient partiellement solubles dans des conditions de température rencontrées à l'extrémité humide d'une machine de fabrication de papier ou de carton, mais qui sont néanmoins rapidement solubles dans des conditions de température plus élevée rencontrées dans la section sèche de ladite machine. Par conséquent, il en résulte une pénétration efficace dans la bande de papier ou de carton par la composition silicate alcalin et des adjuvants sélectionnés. Un des adjuvants particulièrement utile est l'amidon, spécialement sous forme de particules d'amidon non cuites, ce qui confère un effet de renforcement de la résistance synergétique. Selon un autre aspect, l'invention vise à améliorer le processus habituel de fabrication de papier ou de carton, qui consiste à ajouter les compositions décrites ci-dessus sous forme particulaire à une suspension aqueuse de fibres cellulosiques avant la formation d'une bande de papier ou carton.
PCT/CA1998/000915 1997-09-26 1998-09-28 Amelioration de la resistance du papier par traitement au silicate/amidon WO1999016972A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU92494/98A AU9249498A (en) 1997-09-26 1998-09-28 Paper strength enhancement by silicate/starch treatment

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA2,216,480 1997-09-26
CA 2216480 CA2216480A1 (fr) 1997-09-26 1997-09-26 Traitement amidon silicate ameliorant la resistance du papier

Publications (1)

Publication Number Publication Date
WO1999016972A1 true WO1999016972A1 (fr) 1999-04-08

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA1998/000915 WO1999016972A1 (fr) 1997-09-26 1998-09-28 Amelioration de la resistance du papier par traitement au silicate/amidon

Country Status (3)

Country Link
AU (1) AU9249498A (fr)
CA (1) CA2216480A1 (fr)
WO (1) WO1999016972A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002025013A1 (fr) * 2000-09-20 2002-03-28 Akzo Nobel N.V. Procede de production de papier
WO2006005801A1 (fr) * 2004-06-23 2006-01-19 M-Real Oyj Composites de silicium contenant de l'amidon, leur procede de production et utilisation de ceux-ci pour fabriquer du papier et du carton
EP1619304A1 (fr) * 2004-07-06 2006-01-25 Corn Products International, Inc. Compositions d'amidon ayant des fonctions multiples
WO2006061460A1 (fr) * 2004-12-08 2006-06-15 M-Real Oyj Composites d'acetate d'amidon, procede d'obtention, fabrication et utilisation dans le secteur de la fabrication de papier et de carton
EP1889972A1 (fr) * 2006-06-26 2008-02-20 Biltube India Limited Carton d'âme

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2326849A (en) * 1941-09-27 1943-08-17 Chemical Dev Inc Paper sizing material
EP0490425A1 (fr) * 1990-12-11 1992-06-17 Eka Nobel Ab Procédé de préparation de produits contenant de la fibre de cellulose sous forme de feuille ou de tissu
US5358554A (en) * 1993-04-27 1994-10-25 753541 Ontario Inc. Liquid composition for improving strength and water repellency of cast cellulosic fiber products

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2326849A (en) * 1941-09-27 1943-08-17 Chemical Dev Inc Paper sizing material
EP0490425A1 (fr) * 1990-12-11 1992-06-17 Eka Nobel Ab Procédé de préparation de produits contenant de la fibre de cellulose sous forme de feuille ou de tissu
US5358554A (en) * 1993-04-27 1994-10-25 753541 Ontario Inc. Liquid composition for improving strength and water repellency of cast cellulosic fiber products

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002025013A1 (fr) * 2000-09-20 2002-03-28 Akzo Nobel N.V. Procede de production de papier
US6551457B2 (en) 2000-09-20 2003-04-22 Akzo Nobel N.V. Process for the production of paper
WO2006005801A1 (fr) * 2004-06-23 2006-01-19 M-Real Oyj Composites de silicium contenant de l'amidon, leur procede de production et utilisation de ceux-ci pour fabriquer du papier et du carton
EP1761597A1 (fr) * 2004-06-23 2007-03-14 M-real Oyj Composites de silicium contenant de l'amidon, leur procede de production et utilisation de ceux-ci pour fabriquer du papier et du carton
EP1761597A4 (fr) * 2004-06-23 2012-08-08 M Real Oyj Composites de silicium contenant de l'amidon, leur procede de production et utilisation de ceux-ci pour fabriquer du papier et du carton
EP1619304A1 (fr) * 2004-07-06 2006-01-25 Corn Products International, Inc. Compositions d'amidon ayant des fonctions multiples
WO2006061460A1 (fr) * 2004-12-08 2006-06-15 M-Real Oyj Composites d'acetate d'amidon, procede d'obtention, fabrication et utilisation dans le secteur de la fabrication de papier et de carton
EP1889972A1 (fr) * 2006-06-26 2008-02-20 Biltube India Limited Carton d'âme

Also Published As

Publication number Publication date
AU9249498A (en) 1999-04-23
CA2216480A1 (fr) 1999-03-26

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