EP0050316B2 - Verfahren zur Herstellung eines Bahnmaterials mit verbessertem Rückhaltevermögen auf einer Papiermaschine - Google Patents

Verfahren zur Herstellung eines Bahnmaterials mit verbessertem Rückhaltevermögen auf einer Papiermaschine Download PDF

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Publication number
EP0050316B2
EP0050316B2 EP81108353A EP81108353A EP0050316B2 EP 0050316 B2 EP0050316 B2 EP 0050316B2 EP 81108353 A EP81108353 A EP 81108353A EP 81108353 A EP81108353 A EP 81108353A EP 0050316 B2 EP0050316 B2 EP 0050316B2
Authority
EP
European Patent Office
Prior art keywords
binder
agent
process according
inorganic filler
weight
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.)
Expired - Lifetime
Application number
EP81108353A
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English (en)
French (fr)
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EP0050316A1 (de
EP0050316B1 (de
Inventor
Daniel Gomez
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.)
Papeteries de Gascogne SA
Original Assignee
Papeteries de Gascogne SA
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Application filed by Papeteries de Gascogne SA filed Critical Papeteries de Gascogne SA
Priority to AT81108353T priority Critical patent/ATE14765T1/de
Publication of EP0050316A1 publication Critical patent/EP0050316A1/de
Publication of EP0050316B1 publication Critical patent/EP0050316B1/de
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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
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • D21H17/69—Water-insoluble compounds, e.g. fillers, pigments modified, e.g. by association with other compositions prior to incorporation in the pulp or paper

Definitions

  • the present invention relates to a process for the preparation by paper techniques of a sheet material comprising, in addition to fibers, an organic binder, a non-binding mineral filler and a flocculant as well as various conventional adjuvants in stationery, aiming to improve the retention of the mineral load in the sheet, the formation of the sheet and its physical characteristics.
  • the invention also relates to a method making it possible to reduce pollution on the one hand, thanks to the reduction in the quantity of mineral materials which pass through the fabric of the paper machine and on the other hand, thanks to the re-use of coating baths in the bulk of the paper.
  • Papermaking processes are known for the production of sheet materials comprising fibers, non-binding mineral fillers, binders and flocculants. These processes use in situ precipitation techniques in the suspension comprising fibers, mineral fillers and binders using flocculants which can be introduced either before and after the binder, as in the published French patent applications n 2 410 084 and 2 429 293, or in the published European patent application No. 0 006 390, either after the binder as is common in stationery and described for example in the published French patent application No. 2 416 291.
  • the mineral fillers and organic binders customary in stationery and intended to be incorporated into the mass of paper are generally added to the fibers at successive stages in the preparation of the pulp.
  • the mineral particles are previously dispersed in aqueous lighthouse with a preferably anionic surfactant before being mixed with one or more types of organic binders.
  • the sleeping bath which is characterized by very good stability, an essential property for good regularity of the sleeping. is never injected into the mass.
  • the present invention relates to a continuous process for the preparation by paper techniques of a sheet material according to which an aqueous dispersion of particles of mineral filler coated with binder is subjected to ionic destabilization before mixing with the fibers. using a specific cationic flocculant.
  • the method of the invention thus allows better control of the flocculation and good regularity of the particle size of the flocs, which promotes the formation, the appearance, the surface uniformity and the inertia of the sheet.
  • the method according to the invention also makes it possible to improve the fiber-filler-binder connections, which results in the obtaining of improved physical characteristics of the sheet, in particular as regards internal cohesion, resistance to bursting and the holding of the sheet which becomes sufficient for very fast machines.
  • the method according to the invention allows the recycling of the coating baths in the bulk of the paper, which reduces pollution.
  • the anionic power of the latter is reinforced by adding, with stirring, a retention agent of anionic nature.
  • the method according to the invention makes it possible to prepare, with conventional means of manufacturing, surfacing or coating and finishing the stationery, a sheet material endowed with advantageous properties for printing-writing. impregnation, coating, packaging and obtaining complexes with various materials intended in particular for the food industry.
  • All the fibers are suitable for the production of the sheet material according to the invention, but preferably use is made of noble cellulose fibers, that is to say coming from resinous wood pulp and / or hardwood, possibly combined with recovered fibers, for example from old paper and textiles.
  • noble cellulose fibers that is to say coming from resinous wood pulp and / or hardwood
  • recovered fibers for example from old paper and textiles.
  • cellulosic fibers with fibers of high synthetic polymers such as polyamide or polyester fibers or with mineral fibers such as glass, ceramic, calcium sulphate fibers and carbon, or cellulose regeneration fibers, or mixtures thereof.
  • softwood pulps treated with soda bleached or unbleached will be preferred.
  • the non-binding mineral fillers that can be used in the process according to the invention are all the usual mineral fillers in stationery and in the paint industry such as, for example, talc, kaolin, natural calcium carbonate, precipitated or originating from operations. for the regeneration of black liquors extracted from the cooking of kraft pasta and more particularly after the caustification operation, magnesium carbonate, alumina hydrates, calcium sulphate, colloidal silica, barium sulphate, carbon dioxide titanium, satin white (hydrated calcium sulfoaluminate), magnesium hydroxide, or mixtures thereof.
  • talc or kaolin will preferably be chosen for acidic reasons (pH usual 4,5-6) or natural calcium carbonate precipitated or coming from the regeneration of kraft pulp cooking liquors in neutral or basic bonding (pH 6.5).
  • the quantity of mineral filler to be introduced in relation to the quantity of fibers can be very variable depending on the desired applications.
  • the quantity of fillers remaining in the sheet may vary from 5 to 40% by weight, and in particular from 10 to 30% by weight relative to the paper.
  • the loading rate may be greater than 50% by weight relative to the paper.
  • the quantity of remaining charges may vary between 2 and 15% by weight relative to the paper.
  • the organic binder which can be used in the process according to the invention is any organic binder, natural or synthetic, usually used in bulk stationery or in a coating bath. It ensures the connection of the constituents of the material together and makes it possible to improve the physical properties of the sheet material.
  • binders suitable in the process of the invention mention may be made of starches native or modified by chemical, enzymatic or thermal means, dextrins, polyvinyl alcohols, casein, animal glue, vegetable proteins, cellulose esters such as carboxymethylcellulose, alginates, dispersions of ready-to-use synthetic polymers such as carboxylated or non-carboxylated styrene-butadiene latexes, acrylic, styrene-acrylic latexes, vinyl acetates, neoprene latexes, latexes acrylonitrile, vinyl chloride latexes.
  • the amount of binder depends on the end use envisaged for the sheet material, but it can vary between 1 and 40 parts by weight, and preferably between 1 and 25 parts by weight, relative to 100 parts by weight of fibers. and charges.
  • an inorganic or organic destabilizing agent of the bath containing the mineral filler and the organic binder, also called flocculant.
  • This product is of the retention agent or cationic flocculant type chosen from those mentioned above.
  • the role of the flocculant is to precipitate the mineral filler and the organic binder before mixing with the fibers by ionic destabilization.
  • This flocculating agent also makes it possible to improve the wet strength of the sheet.
  • the fibrous suspension is added, before the incorporation of the flocculated charge-binder particles, an anionic retention agent in order to increase its anionic power.
  • an anionic retention agent it is possible to use, for example, a modified polyacrylamide of high molecular weight (5 ⁇ 10 6 to 10 7 ) or a sodium polyacrylate.
  • the role of the anionic retention agent associated with the binder flocculated on the filler is to reinforce the fiber-filler bonds in order to obtain, on the one hand, better retention on canvas and, on the other hand, an increase in the internal cohesion of the sheet. .
  • the amount of anionic retention agent depends on the anionicity of the paste used, which is linked to the manufacturing process (kraft or bisulfite paste) but also to the conditions for washing the paste before use.
  • a kraft pulp from an integrated factory has a much more anionic character than a dried and stored pulp before being sent to the paper machine.
  • 0.005 to 1 part by weight of anionic retention agent is used per 100 parts by weight of fibers.
  • the method according to the invention comprises the following stages.
  • the dough is conventionally refined to a Schoepper Riegler degree varying between 15 and 65 depending on the applications, at a variable concentration of between 20 and 60 g / I, using standard conical refiners or double discs, or else 250-350 gll with special refiners for high concentration refining, in particular in the case of the production of packaging supports, in order to obtain a high tear resistance.
  • the anionic retention agent in aqueous solution is added.
  • the mineral filler is dispersed in an aqueous medium in a tank at a variable concentration of between 400 and 600 g / l.
  • an inorganic dispersant such as sodium hexametaphosphate, or organic such as sodium polyacrylate in an amount between 0.02 and 1% compared to the mineral load. If talc is used as a mineral filler, this operation is not necessary because this filler can be very easily disintegrated in water at 150-600 g / l, without special additive.
  • This mixing operation with stirring can very easily be carried out continuously in a static conical or cylindrical type mixer with offset propeller (s) or in dynamic mixers, all the more so in these types of apparatus. it is also possible to adjust the dilution according to the desired concentration of the final bath, which is 50 to 200 g / l before flocculation.
  • the installation is not equipped with a mixer, it is recommended to homogenize the load-binder bath with 200-500 gll before diluting it between 100 and 350 gll.
  • the cationic flocculant is incorporated into the filler-binder suspension, preferably by metering pump, after having been previously diluted 1 to 10 times.
  • the mineral filler-organic binder flocs in aqueous suspension are then introduced continuously into the pulp of the first stage, before or after purification of the latter.
  • the other additives necessary for obtaining the final properties of the sheet material can be added either to the storage tank for the refined pulp, either continuously in the overhead circuit after the incorporation of the mineral filler and the flocculated organic binder.
  • the pH regulator and the sizing agent customary in stationery are preferably incorporated into the pulp after all the other adjuvants, which is usual in the manufacture of paper.
  • the mixture thus prepared is conveyed to the headbox and is then subjected to the usual treatments of the papermaking process such as draining, wet pressing, drying, possibly rubbing, surfacing on paper machine or outside machine, smoothing, calendering , coating, graining.
  • kraft packaging supports are prepared by methods of the prior art (examples 1 and 2) and by the method according to the invention (examples 3 and 4).
  • the percentage of ash remaining in the control medium is fixed at approximately 10%.
  • a control packaging kraft support is prepared using a binder and a flocculant which is added after the binder in the fibrous suspension, using the following constituents:
  • a kraft packaging support is prepared using the method according to the invention.
  • a first mixture of resinous wood pulp having an SR refining degree of 25 and an anionic retention agent is first prepared.
  • a second binder-mineral filler mixture is then prepared using the following constituents:
  • the binder is mixed with talc, dispersed, then 0.2 part by weight of polyethyleneimine in solution is added as a flocculant to the mixture.
  • the second mixture is incorporated into the first mixture.
  • a kraft packaging support is prepared according to the method of the invention in the same way as in Example 3, but by removing the anionic retention agent.
  • the internal cohesion of the sheet material prepared according to the method of the invention is approximately 10% greater than that obtained by the methods of the prior art.
  • a printing-writing medium bonded in a neutral medium having variable grammages is prepared according to a method of the prior art and according to the method of the invention.
  • a print-write control medium having a grammage of 100 g / m 2 , bonded in a neutral medium, is prepared using a process of the prior art according to which the flocculant is added to the fibrous suspension containing the mineral filler and the organic binder.
  • a mixture is obtained having the following composition:
  • a print-write control medium of the above type is prepared, but having a grammage of 200 g / M 2 .
  • a second binder-mineral filler mixture having the following composition is prepared:
  • the starch binder is mixed with the carbonate charge, dispersed, then 0.3 parts by weight of polyethylene imine in solution is added to flocculate the mixture.
  • the second mixture is incorporated into the first mixture, and then:
  • a print-write medium is prepared in the same way as in Example 7, this medium having a grammage of 200 g / m 2 .
  • This example illustrates the reuse of a bath commonly used in bedding in the process according to the invention.
  • the second mixture consists of a coating bath used for print-writing supports printable in offset.
  • This sleeping bath has the following composition:
  • the bath is diluted beforehand to 150 g 11 then, with stirring, the cationic flocculant previously diluted five times is incorporated, which consists of 0.15 part by weight of polyethylene imine in solution per 100 parts by weight of fillers and binder.
  • the second flocculated mixture is incorporated into the first mixture, then there is introduced:
  • the sheet formed is characterized by a rate of remaining charges of 26%, which indicates good retention on canvas, and by a high internal cohesion.

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Prostheses (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Laminated Bodies (AREA)

Claims (11)

1. Methoden der Papierfabrikation anwendendes kontinuierliches Verfahren zur Herstellung eines blattförmigen Materials, dadurch gekennzeichnet, daß die folgenden Vorgänge in der nachstehend angegebenen Reihenfolge ausgeführt werden:
1) Es wird eine wäßrige Dispersion von Partikeln eines mineralischen Füllstoffes, der unter den in der Papierindustrie üblichen Füllstoffen ausgewählt wird, hergestellt.
2) Es wird dieser wäßrigen Füllstoffdispersion ein in der Papierindustrie übliches organisches Bindemittel unter Rühren beigefügt, bis eine wäßrige Dispersion von mit Bindemittel umschlossenen mineralischen Füllstoffpartikeln erhalten wird.
3) Bei dieser wäßrigen Disperion von mit Bindemittel umschlossenen Füllstoffpartikeln wird unter Rühren vorder Vermischung mit den Fasern mittels eines unter den wäßrigen Lösungen von Polyäthylenimin, Polyamidamin, vernetztem Polyalkylamin, modifizierten Polyacrylamiden, Aluminiumpolychlorid sowie unter den wäßrigen Lösungen von quaternärem Ammonium ausgewählten kationischen Flockungsmitteln eine ionische Destabilisierung durchgeführt, wobei das kationische Flockungsmittel in einer so eingestellten Menge eingesetzt wird, damit die Gesamtflockung innerhalb von maximal einer Minute stattfindet.
4) Es werden die mineralischen Füllstoff lorganischen Bindemittelflocken in wäßriger Suspension in die fasrige Suspension eingeführt.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß vor dem Eingeben der mineralischen Füllstofi-lorganischen Bindemittelflocken in die fasrige Suspension die anionische Leistung letzterer dadurch verstärkt wird, daß unter Umrühren ein Retentionswirkstoff mit anionischen Eigenschaften beigefügt wird.
3. Verfahren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die ionische Destabilisierung der wäßrigen Füllstoff-/Bindemitteldispersion dadurch erhalten wird, daß in diese Dispersion ein vorher ein- bis zehnmal verdünntes kationische Flockungsmittel eingegeben wird.
4. Verfahren nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß der mineralische Füllstoff unter Talkum, Kaolin und natürlichem oder ausgefälltem Calciumcarbonat ausgewählt wird.
5. Verfahren nach Anspruch 1 bis 4, dadurch gekennzeichnet, daß das organische Bindemittel unter den nativen oder chemisch, enzymatisch oder durch Wärmebehandlung modifizierten Stärken, Dextrinen, Polyvinylalkoholen, Kasein, Glutinleim, Pflanzenproteinen, Celluloseester, Alginat und synthetischen gebrauchsfertigen Polymerdispersionen wie Latex ausgewählt wird.
6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß das organische Bindemittel native nach dem Kochen eingesetzte Stärke ist.
7. Verfahren nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß die Bindemittelmenge zwischen 1 und 40 Gewichtsteilen, vorzugsweise zwischen 1 und 25 Gewichtsteilen auf 100 Gewichtsteile Fasern und Füllstoff liegt
8. Verfahren nach den Ansprüchen 1 bis 7, dadurch gekennzeichnet, daß das kationische Flockungsmittel mit einem Anteil zwischen 0,006 und 5 Gewichtsteilen, vorzugsweise zwischen 0,01 und 2 Gewichtsteilen pro 100 Gewichtsteile mineralischem Füllstoff und organischem Bindemittel zugesetzt ist.
9. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß der Retentionswirkstoff mit anionischen Eigenschaften unter den modifizierten Polyacrylamiden mit hohem Molekulargewicht und den Natriumpolyacrylaten ausgewählt wird.
10. Verfahren nach Anspruch 1 bis 9, dadurch gekennzeichnet, daß außerdem in der Papierindustrie übliche Zusatzstoffe verwendetwerden, wie z.B. ein Klebemittel, ein pH-Regelungsmittel, ein schaumhemmendes Mittel, ein optischer Aufheller, ein Färbe- oder Tönungsmittel, ein Naßbeständigkeitsmittel, ein fungizid und/oder bakterizid wirkendes Mittel, ein Dispergiermittel, ein Gleitmittel und ein Mittel zur Regelung der Viskosität.
11. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die wäßrige Dispersion von mit Bindemittel umhüllten mineralischen Füllstoffpartikeln des Schrittes 2) ein Gautschbad ist.
EP81108353A 1980-10-21 1981-10-15 Verfahren zur Herstellung eines Bahnmaterials mit verbessertem Rückhaltevermögen auf einer Papiermaschine Expired - Lifetime EP0050316B2 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81108353T ATE14765T1 (de) 1980-10-21 1981-10-15 Verfahren zur herstellung eines bahnmaterials mit verbessertem rueckhaltevermoegen auf einer papiermaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8022501A FR2492425A1 (fr) 1980-10-21 1980-10-21 Procede de preparation par des techniques papetieres d'un materiau en feuille avec une retention sur machine amelioree, materiau en feuille ainsi obtenu et son application notamment dans le domaine de l'impression-ecriture, de l'emballage et des revetements
FR8022501 1980-10-21

Publications (3)

Publication Number Publication Date
EP0050316A1 EP0050316A1 (de) 1982-04-28
EP0050316B1 EP0050316B1 (de) 1985-08-07
EP0050316B2 true EP0050316B2 (de) 1991-12-04

Family

ID=9247151

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EP81108353A Expired - Lifetime EP0050316B2 (de) 1980-10-21 1981-10-15 Verfahren zur Herstellung eines Bahnmaterials mit verbessertem Rückhaltevermögen auf einer Papiermaschine

Country Status (7)

Country Link
US (1) US4943349A (de)
EP (1) EP0050316B2 (de)
AT (1) ATE14765T1 (de)
DE (2) DE50316T1 (de)
ES (1) ES8302822A1 (de)
FI (1) FI69669C (de)
FR (1) FR2492425A1 (de)

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EP0050316A1 (de) 1982-04-28
ES506382A0 (es) 1983-01-16
FR2492425A1 (fr) 1982-04-23
EP0050316B1 (de) 1985-08-07
FR2492425B1 (de) 1984-08-17
ES8302822A1 (es) 1983-01-16
FI69669C (fi) 1986-03-10
US4943349A (en) 1990-07-24
ATE14765T1 (de) 1985-08-15
DE3171717D1 (en) 1985-09-12
DE50316T1 (de) 1983-04-14
FI813268L (fi) 1982-04-22
FI69669B (fi) 1985-11-29

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