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
  • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
  • D21H23/76—Processes or apparatus for adding material to the pulp or to the paper characterised by choice of auxiliary compounds which are added separately from at least one other compound, e.g. to improve the incorporation of the latter or to obtain an enhanced combined effect
  • D21H23/765—Addition of all compounds to 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
  • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
  • D21H17/03—Non-macromolecular organic compounds
  • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
  • D21H17/14—Carboxylic acids; Derivatives thereof
  • D21H17/15—Polycarboxylic acids, e.g. maleic acid
  • D21H17/16—Addition products thereof with hydrocarbons
• • 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
  • D21H17/03—Non-macromolecular organic compounds
  • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
  • D21H17/17—Ketenes, e.g. ketene dimers
• • 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
  • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
  • D21H17/63—Inorganic compounds
  • D21H17/66—Salts, e.g. alums
• • 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
  • D21H17/675—Oxides, hydroxides or carbonates

Definitions

• the present invention relates to a process for making paper.
• the raw paper pulp consisting essentially of cellulose fibers is put in the form of a dilute aqueous suspension which is brought into the headbox of the paper machine from where it is distributed on a filter cloth on which the sheet is formed. of paper. This sheet is then wrung and dried.
• the qualities and properties of the paper obtained are determined in particular by the operating conditions of the paper machine, the raw pulp, the various additives that are added to the suspension before the sheet is formed and also the products that are coated. on the sheet of paper after the filter cloth.
• the present invention relates more particularly to the products which are added before the sheet is formed.
• mineral fillers such as calcium carbonate, titanium dioxide, etc. These fillers make the sheet of paper opaque which facilitates writing and printing.
• a bonding agent is also added to make the sheet resistant to liquids, that is to say that the bonded sheet of paper can be used for writing and printing. It is also necessary to add a retentive system which precipitates the bonding agent on the cellulose fibers and which also allows the retention of mineral fillers in the paper sheet.
• the retentive system is often a mixture of several products. We also add products to improve the mechanical qualities of paper, dyes, etc.
• the patent application under Japanese priority 85 JP 031519 of February 21, 1985 speaks of a collage in a neutral medium.
• the filler is calcium carbonate, poly aluminum chloride and a high molecular weight retention agent are added.
• Patent GB 2 015 614 describes processes for manufacturing paper and cardboard in which a basic aluminum polychlorosulfate is added to the suspension before the sheet is formed. But either one does not stick, or one uses collophane, and one knows that the rosin must be used in acid medium, see KIRK OTHMER already quoted, page 810.
• the suspension containing the cellulose fibers can be raw or bleached pulp, or a mixture of raw pulp and bleached pulp, or a pulp already containing additives.
• the mineral filler can be any one or more products, preferably chosen from clay, calcium carbonate, silica, hydrated alumina, talc, titanium dioxide, etc.
• These products are introduced in finely divided form or in the form of a paste or solution in the suspension. It is preferred to use calcium carbonate.
• the amount of carbonate can be any, and often is at most 40 parts per 100 parts of cellulose fibers, and preferably between 10 and 25. This quantity does not take not taking into account the charges contained in the recycled paper at the start of production in the suspension.
• any bonding agent can be used, an agent which is used in a neutral environment is preferred.
• the sizing agent can be a mixture of one or more products chosen from dimeric ketene alkyls and their derivatives, fluorinated phosphates, anhydrides of fatty chain carboxylic acids, certain polyurethanes, styrene maleic anhydride copolymers.
• dimeric ketene alkyls and carboxylic acid anhydrides are preferred.
• the quantity to be used depends on the desired properties of the paper.
• the amount is less than 10 parts per 100 parts of cellulose fibers, and preferably between 0.1 and 2 parts.
• Cationic starch is a mixture of one or more products marketed under the generic name of cationic starch. These products are for example those described in KIRK OTHMER, 3rd edition, Vol. 21 page 503. The quantity is advantageously less than 5 parts per 100 parts of cellulose fibers and preferably less than 2.
• the quantity of polychloride of aluminum to be used expressed in Al2O3 is advantageously less than 0.5 parts per 100 parts of cellulose fibers and preferably between 0.05 and 0.2 parts.
• the products a to d are added separately or as a mixture, or partially mixed and in any order. However, it is preferable to add poly aluminum chloride after the others. It is also preferred that the poly aluminum chloride be added as close as possible to the headbox. Cationic starch and polychloride of aluminum are not qualified as retentive systems; as we have indicated above all the products added to the suspension before the formation of the paper sheet act together.
• the present invention consists in adding the products a to d in the suspension and the Applicant has found that the joint use of these products has numerous advantages. The present invention is particularly useful for the manufacture of paper bonded in a neutral medium. The process of the present invention makes it possible to load the paper with products sensitive to acids such as calcium carbonate.
• Another advantage of the invention is good retention of the charges and consequently a large reduction in the suspended matter in the waters obtained during the formation of the sheet.
• Another advantage of the invention is greater productivity of the paper machine and better internal cohesion. All these advantages will appear in the examples.
• products a to d can be added in addition to one or more products chosen from polyacrylamides, poly (ethyleneimines), carboxymethylcellulose, urea-formaldehyde resins, melamine-formaldehyde resins, aminopolyamide-epichlorohydrin resins, polyamide-epichlorohydrin resins.
• these products are used in addition to the cationic starch and in the same quantities.
• the internal cohesion measured by the so-called "pendulum” device, is 87.
• the pendulum device used is the INTERNAL BOND IMPACT TESTER MODEL B supplied by GCA / PRECISION SCIENTIFIC, 3737 W. Cortland street, CHICAGO, USA.
• the pH of the suspension during the formation of the sheet is 7.4.
• the suspended solids (MES) in the clarified return waters are 170 mg / l.
• Example 2 The procedure is as in Example 1, but instead of poly (ethyleneimine), an aluminum polychloride of formula (II) is added in an amount of 0.1 part (expressed as Al2O3) per 100 parts of cellulose fibers.
• an aluminum polychloride of formula (II) is added in an amount of 0.1 part (expressed as Al2O3) per 100 parts of cellulose fibers.
• a production speed of 221 m / min is then obtained, a charge retention of 86%, a total retention of 95.5%.
• the internal cohesion becomes 110, the SS in the clarified return waters 100 mg / l and the pH in the headbox 7.3.
• polychloride of aluminum keeps the medium in the pH zone compatible with the use of calcium carbonate. It provides a total retention gain of 3.5 points and charge retention of 9 points. The machine speed could be increased by 7%. The content of suspended matter in canvas water has decreased significantly. There is a gain in internal cohesion.
• Example 5 The procedure is as in Example 5 but less polyacrylamide is introduced, 100 g / T instead of 300 g / T, and a poly aluminum chloride of formula (II) is added in proportion to 0.1 part expressed as Al2O3 per 100 parts of fiber.

Landscapes

• Paper (AREA)
• Making Paper Articles (AREA)
• Diaphragms For Electromechanical Transducers (AREA)
• Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
• Superconductors And Manufacturing Methods Therefor (AREA)
• Polysaccharides And Polysaccharide Derivatives (AREA)
• Electroluminescent Light Sources (AREA)
• Electronic Switches (AREA)
• Processes Of Treating Macromolecular Substances (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

Family

ID=9349312

Family Applications (1)

Country Status (13)

Families Citing this family (9)

Family Cites Families (7)

• 1987
  • 1987-03-23 FR FR8704003A patent/FR2612961B1/fr not_active Expired
• 1988
  • 1988-03-08 NO NO881029A patent/NO173887C/no unknown
  • 1988-03-15 AT AT88400618T patent/ATE73184T1/de active
  • 1988-03-15 ES ES198888400618T patent/ES2029522T3/es not_active Expired - Lifetime
  • 1988-03-15 DE DE8888400618T patent/DE3868659D1/de not_active Revoked
  • 1988-03-15 EP EP19880400618 patent/EP0285487B1/fr not_active Expired - Lifetime
  • 1988-03-22 CA CA000562131A patent/CA1312708C/fr not_active Expired - Fee Related
  • 1988-03-22 DK DK154788A patent/DK170686B1/da not_active IP Right Cessation
  • 1988-03-22 FI FI881369A patent/FI94972C/fi not_active IP Right Cessation
  • 1988-03-22 IE IE84288A patent/IE60052B1/en not_active IP Right Cessation
  • 1988-03-22 PT PT87044A patent/PT87044B/pt not_active IP Right Cessation
  • 1988-03-23 JP JP63069224A patent/JPS63256796A/ja active Pending
• 1992
  • 1992-06-04 GR GR920401145T patent/GR3004804T3/el unknown

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