NO832355L - Calcium carbonate, especially natural calcium carbonate - Google Patents

Calcium carbonate, especially natural calcium carbonate

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Publication number
NO832355L
NO832355L NO832355A NO832355A NO832355L NO 832355 L NO832355 L NO 832355L NO 832355 A NO832355 A NO 832355A NO 832355 A NO832355 A NO 832355A NO 832355 L NO832355 L NO 832355L
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NO
Norway
Prior art keywords
calcium carbonate
particles smaller
less
specific surface
paper
Prior art date
Application number
NO832355A
Other languages
Norwegian (no)
Inventor
Manfred Arnold
Peter Belger
Ludwig Huggenberger
Dieter Strauch
Original Assignee
Pluss Stauffer Ag
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Filing date
Publication date
Application filed by Pluss Stauffer Ag filed Critical Pluss Stauffer Ag
Publication of NO832355L publication Critical patent/NO832355L/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5218—Macromolecular coatings characterised by inorganic additives, e.g. pigments, clays
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/18—Carbonates
    • C01F11/185—After-treatment, e.g. grinding, purification, conversion of crystal morphology
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/02—Compounds of alkaline earth metals or magnesium
    • C09C1/021—Calcium carbonates
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/385—Oxides, hydroxides or carbonates
    • 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
    • D21H21/50—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 form
    • D21H21/52—Additives of definite length or shape
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/12—Surface area

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Paper (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Pigments, Carbon Blacks, Or Wood Stains (AREA)
  • Coloring Foods And Improving Nutritive Qualities (AREA)

Description

Nærværende oppfinnelse vedrører kalsiumkarbonater, og da spesielt naturlige kalsiumkarbonater, fremgangsmåte for deres fremstilling og deres foretrukkede anvendelse som bestrykningspigmenter i dyptrykkingspapir. The present invention relates to calcium carbonates, and in particular natural calcium carbonates, methods for their production and their preferred use as coating pigments in gravure printing paper.

Bestrøket papir er bestrøket med en masse som i alt vesentlig inneholder et bindemiddel og et pigment i form av et miner-alsk fyllstoff. En beskrivelse vedrørende sammensetningen av papirbeleggingsmateriale og deres anvendelse er å finne i en bok av James P. Casey "Pulp and paper Chemistry and Technology", kapittel XIX, band III (1961). Coated paper is coated with a mass which essentially contains a binder and a pigment in the form of a mineral filler. A description of the composition of paper coating materials and their use can be found in a book by James P. Casey "Pulp and paper Chemistry and Technology", Chapter XIX, Volume III (1961).

I trykkeriteknikken er i alt vesentlig tre forskjellige trykkerifremgangsmåter kjent, nemlig boktrykking, offsettrykk-ing og dyptrykking. In printing technology, essentially three different printing methods are known, namely letterpress printing, offset printing and gravure printing.

Boktrykk er en såkalt høytrykk-fremgangsmåte. Som ved stem-pel står den for trykking aktuelle flaten opphøyd i trykk-formen. Ved hjelp av valser innfarges den opphøyde billed-flaten. Ved denne trykkfremgangsmåten anvendes også bestrø-ket papir, som inneholder kaolin eller kalsiumkarbonat. Letterpress is a so-called letterpress method. As with a stamp, the surface to be printed is raised in the printing form. With the help of rollers, the raised image surface is colored. In this printing process, coated paper is also used, which contains kaolin or calcium carbonate.

Offsettrykk er en såkalt flattrykk-fremgangsmåte, d.v.s. at trykk- og ikke-trykk-delene ligger i et plan. De skiller seg fra hverandre ved at trykk-delen opptar og avgir fett (d.v.s. trykkfarge), men avviser vann, mens de ikke trykkende deler fastholder vann men avviser fett (farge). Den roterende trykksylinder passerer først den vannførende og deretter den fargeførende valse. Den trykker imidlertid ikke direkte på papir men på en over en sylinder oppspent gummiduk. Først fra denne opptar papiret, nemlig ved hjelp av en syliner som trykkes mot gummisylinderen, trykkbildet. Ved denne fremgangsmåte anvendes såvel kaolin som kasliumkarbonat som bestrykningspigmenter. Offset printing is a so-called flat printing method, i.e. that the pressure and non-pressure parts lie in one plane. They differ from each other in that the printing part absorbs and emits fat (i.e. ink) but repels water, while the non-printing parts retain water but repel fat (colour). The rotating pressure cylinder first passes the water-carrying and then the color-carrying roller. However, it does not print directly on paper but on a rubber cloth stretched over a cylinder. Only from this does the paper take up the printed image, namely with the help of a cylinder that is pressed against the rubber cylinder. In this method, both kaolin and potassium carbonate are used as coating pigments.

Ved dyptrykking ligger trykkdelene til sylinderen under den polerte overflaten. Sylinderen passerer først det med flyten-de farge fylte kar, deretter sjaberen, en stållineal, som fjerner overskytende fargestoff, mens den for trykking bestem-te fargen fastholdes og overrulles av pressorganet som fører papiret, og hvorved fargen suges ut. In gravure printing, the printing parts of the cylinder lie below the polished surface. The cylinder first passes the vessel filled with the liquid color, then the squeegee, a steel ruler, which removes excess dye, while the color intended for printing is retained and rolled over by the press organ which guides the paper, and by which the color is sucked out.

For dyptrykking anvendes i alt vesentlig bare kaolin som bestrykningspigment. I litteraturen (f.eks. DE-OS 31 32 841 og DE-OS 29 43 653) beskrives riktignok kalsiumkarbonat som bestrykningsmiddel i samband med dyptrykkings-papir. Kalsiumkarbonat har imidlertid i det alt vesentlige ikke blit anvendt ved dyptrykking, og da spesielt fordi man innenfor fagkretser har vært av den mening at kaolin har hatt vesentlig bedre egenskaper som bestrykningsmiddel for dyptrykkings-papir. I litteraturen frarådes det sågar å anvende kasliumkarbonat som bestrykningspigment for dyptrykkingspapir med den begrunnelse at det oppnådde trykkresultater vil bli dårlige. I det føl-gende skal det gis ekesempler på slik litteratur, nemlig: 1. "ECC International", hustidskrift, 1981, "How developments in coating pigments affect paper printability" av Dr. Ken Beazley, Research and Development, sidene 1 og 2. I dette tid-skrift sies at malt kalsiumkarbonat er et dårligere bestrykningspigment for dyptrykkings-papir. På side 2 poengteres det at kasliumkarbonat gir dårlig trykkbarhet. 2. Tappi Coating^. Proceedings 1979: "Possibilities and Limita-tions of High Solids Colours", side 39. Under punkt 4 "ab-stract" nr. 3, sies det at trykkvaliteten ved anvendelse av malt kalsiumkarbonat er dårligere enn kaolin ved samme og ved høyere faststoffkonsentrasjoner. For gravure printing, essentially only kaolin is used as coating pigment. In the literature (e.g. DE-OS 31 32 841 and DE-OS 29 43 653) it is true that calcium carbonate is described as a coating agent in connection with gravure printing paper. However, calcium carbonate has essentially not been used in gravure printing, and especially because it has been held within professional circles that kaolin has had significantly better properties as a coating agent for gravure printing paper. In the literature, it is even advised against using calcium carbonate as a coating pigment for gravure printing paper on the grounds that the print results obtained will be poor. In the following, examples of such literature will be given, namely: 1. "ECC International", house magazine, 1981, "How developments in coating pigments affect paper printability" by Dr. Ken Beazley, Research and Development, pages 1 and 2 In this magazine it is said that ground calcium carbonate is an inferior coating pigment for gravure printing paper. On page 2, it is pointed out that calcium carbonate gives poor printability. 2. Tappi Coating^. Proceedings 1979: "Possibilities and Limita-tions of High Solids Colours", page 39. Under item 4 "ab-stract" no. 3, it is said that the print quality when using ground calcium carbonate is worse than kaolin at the same and at higher solids concentrations.

Anvendelsen av kaolin som bestrykningsoigment i dyptrykkingspapir er imidlertid forbundet med en rekke ulemper, og da spesielt a)dårlige, reologiske egenskaper, hvorved det ikke er mulig å bestryke med høyere konsentrasjoner av faststoff, hvilket betinger høyere energiomkostninger ved tørkingen; b) økt behov for bindemidler; og c) uøkonomisk på grunn av høyere omkostninger. The use of kaolin as a coating agent in gravure paper is, however, associated with a number of disadvantages, and in particular a) poor rheological properties, whereby it is not possible to coat with higher concentrations of solids, which results in higher energy costs during drying; b) increased need for binders; and c) uneconomic due to higher costs.

Formål med nærværende oppfinnelse er derfor å eliminere disse ulemper, og da spesielt å fremskaffe et bestrykningspigment for dyptrykkingspapir, som ved høyere faststoffkonsentrasjoner kan bestrykes med mindre mengder bindemiddel, hvorved det kan innspares på energi, og som således gir et dyptrykkingspapir med høy glans og høyere opasitet samt bedre verdier for gjennomslag og gjennomsiktighet enn det som er mulig å oppnå med bestrykningspigmenter ifølge kjent teknikk. The purpose of the present invention is therefore to eliminate these disadvantages, and then in particular to provide a coating pigment for gravure printing paper, which at higher solids concentrations can be coated with smaller amounts of binder, whereby energy can be saved, and which thus provides a gravure printing paper with a high gloss and higher opacity as well as better values for penetration and transparency than is possible to achieve with coating pigments according to known techniques.

Etter årelange cg omfangsrike forsøk har det overraskende vist seg at det i motsetning til hva som er oppfatningen innen fagkretser kan anvendes kalsiumkarbonat for å løse den stilte oppgave. De karakteristiske trekkk ved fremgangsmåten vil i alt vesentlig fremgå av patentkrav 1. After years and extensive trials, it has surprisingly turned out that, contrary to what is believed in professional circles, calcium carbonate can be used to solve the task at hand. The characteristic features of the method will essentially appear from patent claim 1.

Oppfinnelsen er altsåkarakterisert veden helt bestemt kom-binasjon av tre trekk, hvorved 50 - 70 % av partiklene er mindre enn 1 yjm , mindre enn 10 % (og da spesielt 1 fcil 10 %) av partiklene mindre enn 0,2 yom , og hvorved den spesifike overflaten ifølge BET er mindre enn 10 m^/g. Fortrinnsvis er det øvre gjennomsnittet til produktene ifølge oppfinnelsen 3 til 10 m<2>/g. The invention is thus characterized by a specific combination of three features, whereby 50 - 70% of the particles are smaller than 1 µm, less than 10% (and especially 1 fcil 10%) of the particles smaller than 0.2 µm, and whereby the specific surface according to BET is less than 10 m^/g. Preferably, the upper average of the products according to the invention is 3 to 10 m<2>/g.

Innenfor rammen av nærværende oppfinnelse har man funnet at alle jordalkalikarbonater og deres blandinger såsom dolo-mitt med fordel kan anvendes. Utfelt kasliumkarbonat løser den stilte oppgave meget godt. Naturlige kalsiumkarbonater såsom kalksten, kritt og marmor eller deres blandinger har vist seg å være utmerket. Within the framework of the present invention, it has been found that all alkaline earth carbonates and their mixtures such as dolomite can be used with advantage. Precipitated calcium carbonate solves the task very well. Natural calcium carbonates such as limestone, chalk and marble or their mixtures have proven to be excellent.

Foretrukne utførelsesformer av oppfinnelsen er beskrevet i patentkravene 2 til 5. Samtlige prosentangivelser er i vekt-%. Angivelsen av partikkelstørrelse i yim henfører seg til sfær-isk diameter. Preferred embodiments of the invention are described in patent claims 2 to 5. All percentages are in % by weight. The indication of particle size in yim refers to spherical diameter.

Ytterligere karakteristiske trekk og fordeler med nærværende oppfinnelse vil fremgå av etterfølgende beskrivelse i for-bindelse med forskjellige utførelseseksempler. Further characteristic features and advantages of the present invention will be apparent from the following description in connection with various exemplary embodiments.

Eksempel 1:Example 1:

Fremstilling av forsøksprodukter.Manufacture of experimental products.

Naturlig kalsiumkarbonat ble på i og for seg kjent måte for-malt tørt. Finmalingen skjedde vått i en sand-mølle. Derved valgtes malebetingelsene slik at andelen av partikler som var mindre enn 1 ^um og mindre enn 0,2 yum slik at den spesifike overflaten kunne varieres meget. Natural calcium carbonate was pre-ground dry in a manner known per se. The fine grinding took place wet in a sand mill. Thereby, the grinding conditions were chosen so that the proportion of particles that were smaller than 1 µm and smaller than 0.2 µm so that the specific surface could be varied greatly.

Målingen av kornstørrelsefordelingen skjedde ved hjelp av sedimentasjonsanalyse, måling av den spesifike overflaten iføl-ge BET-metoden. The measurement of the grain size distribution took place using sedimentation analysis, measurement of the specific surface according to the BET method.

Ifølge ovenfor beskrevne metode ble tre produkter med forskjellige andeler av partikler mindre enn 1 yom fremstilt for å vise innflytelsen av disse andeler på papirbestrykningsfar-gen. According to the method described above, three products with different proportions of particles smaller than 1 µm were produced to show the influence of these proportions on the paper coating colour.

Undersøkelsen av disse produkter skjedde med en papirbestryk-ningsf arge for dyptrykking. The examination of these products took place with a paper coating color for gravure printing.

Bestrykningsfargeresept:<*>a-t. = absolutt tørr Coating color recipe:<*>a-t. = absolutely dry

Bestrykningsbetingelser: Coating conditions:

Undersøkelsesbetingelser: Examination conditions:

Laboratorietrykking- dyptrykking: Laboratory printing - gravure printing:

Vurderingen av trykkvaliteten skjedde visuelt. Det ble satt opp en rangordning. The assessment of the print quality took place visually. A ranking was set up.

Trykkglans:Print Gloss:

Glansmålingen skjedde ifølgeTappi i 75° innstråling- og ut-strålingsvinkel på den totale flaten til laboratorietrykkin-gen-dyptrykkingen. According to Tappi, the gloss measurement took place at a 75° angle of incidence and radiation on the total surface of the laboratory printing intaglio printing.

Gjennomslag og gjennomsiktighet:Impact and transparency:

Det ble anvendt laboratorietrykking-dyptrykking.Laboratory printing-gravure printing was used.

Man målte remisjonsgraden til det bestrøkne ikke-trykte papiret (= R) samt remisjonsgraden til baksiden til den trykte totalflaten (= Rfr). The degree of remission to the coated non-printed paper (= R) as well as the degree of remission to the reverse side of the total printed surface (= Rfr) were measured.

Alt papir ble trykt uten statisk trykkhjelp. All paper was printed without static pressure assistance.

Vurderingen av de utførte trykkeriforsøkene skjedde visuelt. Det ble oppstilt en rangliste. The assessment of the printing tests carried out was done visually. A ranking list was drawn up.

Produktet VP 60 med en andel på 62 % mindre enn 1 yam gir med hensyn til glans, trykkglans, opasitet, gjennomslag + gjennomskinnlighet og ved de utførte forsøk de beste resultater. Deretter følger produktene VP 70 og VP 50 med en andel på 70 resp. 53 % mindre enn 1 yjm. Den optimale andelen av partikler mindre enn 1 um ligger ifølge oppfinnelsen mellom 50 og 70 %, fortrinnsvis ved 60 %. The product VP 60 with a proportion of 62% less than 1 yam gives the best results in terms of gloss, print gloss, opacity, penetration + transparency and in the tests carried out. Then follow the products VP 70 and VP 50 with a share of 70 resp. 53% less than 1 yjm. According to the invention, the optimal proportion of particles smaller than 1 µm is between 50 and 70%, preferably at 60%.

Eksempel 2:Example 2:

Ifølge en i eksempel 1 beskrevne metode ble 2 produkter med samme: andel av partikler mindre enn 1'^um , men med høyere og lavere andel av partikler mindre enn 0,2 ^um hhv. høyere og lavere spesifik overflate fremstilt, for å vise forskjellen mellom kalsiumkarbonat ifølge oppfinnelsen og et kasliumkarbonat som man. ifølge oppfinnelsen ikke lykkedes med. According to a method described in example 1, 2 products were obtained with the same: proportion of particles less than 1 µm, but with a higher and lower proportion of particles less than 0.2 µm respectively. higher and lower specific surface area produced, to show the difference between calcium carbonate according to the invention and a calcium carbonate such as man. according to the invention did not succeed.

Undersøkelsen av disse produkter skjedde i en papirbestryknings farge for dyptrykking. The examination of these products took place in a paper coating color for gravure printing.

Bestrykningsfargeresept:Coating color recipe:

Bestrykningsbetingelser: Coating conditions:

Ifølge deu eksempel 1 beskrevne undersøkelsesbetingelser erholdt man følgende According to the examination conditions described in example 1, the following was obtained

Mens produktet VP 5 ifølge oppfinnelsen tilfredsstiller den stilte oppgave erholdt man utilfredsstillende resultater med VP 14, hvilket forøvrig er overraskende fordi VP 5 utgjør et grovere kalsiumkarbonat enn VP 14. While the product VP 5 according to the invention satisfies the task set, unsatisfactory results were obtained with VP 14, which is otherwise surprising because VP 5 constitutes a coarser calcium carbonate than VP 14.

Eksempel 3:Example 3:

Ifølge den i eksempel 1 beskrevne metode ble det fremstilt et produkt som ifølge en foretrukket utførelsesform inneholdt gunstige verdier med hensyn til andelene mindre enn 1^um, mindre enn 0,2 yam og spesifik overflate. According to the method described in example 1, a product was produced which, according to a preferred embodiment, contained favorable values with regard to the proportions less than 1 µm, less than 0.2 µm and specific surface area.

Undersøkelsen av dette produkt skjedde under sammenligning med en i praksis vanlig anvendt kaolin i en papirbestrykningsfarge for dyptrykking, altså et produkt ifølge teknikkens stand. The examination of this product took place in comparison with a kaolin commonly used in practice in a paper coating color for gravure printing, i.e. a product according to the state of the art.

Bestrykningsbetingelser: Ifølge de i eksempel 1 beskrevne undersøkelsesbetingelser erholdt man følgende Coating conditions: According to the examination conditions described in example 1, the following was obtained

Undersøkelsesresultater; Survey results;

Det i dette eksempel anvendte kalsiumkarbonat ifølge oppfinnelsen, nemlig VP 60/6, med 60 % partikler mindre enn 1 yam og 6 % mindre enn 0,2 ^im, samt med en spesifik overflate på 7,8 m^/<?/<?ir samme glans og trykkglans-verdier som sammenligningskaolin. Når det gjelder såvel opasitet som gjennomslag og gjennomskinnlighet og ved laboratorietrykking gir VP 60/6 bedre resultater enn sammenligningskaolin. Ved forsøkene i praksis blir begge produkter vurdert likt. The calcium carbonate used in this example according to the invention, namely VP 60/6, with 60% particles smaller than 1 µm and 6% smaller than 0.2 µm, and with a specific surface of 7.8 m^/<?/< It has the same gloss and print gloss values as comparison kaolin. When it comes to opacity as well as penetration and transparency and in laboratory printing, VP 60/6 gives better results than comparative kaolin. In the trials in practice, both products are evaluated equally.

Disse resultater viser at det uten videre kan fremstilles en papirbestrykningsfarge med et kalsiumkarbonat ifølge produktet VP60/6 for dyptrykking, og hvorved det erholdes et belagt papir som er det vanligvis under anvendelse av kaolin frem-stilte dyptrykkingspapir jevnbyrdig og delvis overlegen. These results show that a paper coating color can be easily produced with a calcium carbonate according to the product VP60/6 for gravure printing, and whereby a coated paper is obtained which is equal to and partially superior to gravure printing paper usually produced using kaolin.

Fra bestrykningsfargeresepten ifølge eksempel 3 fremgår at det når det gjelder kalsiumkarbonat kan?det anvendes omkring 20 % mindre bindemiddel for å oppnå samme eller delvis bedre egenskaper. Reduksjon av andelen bindemiddel betyr en vesentlig innsparing for papirfremstilleren. From the coating color recipe according to example 3, it appears that, in the case of calcium carbonate, around 20% less binder can be used to achieve the same or partially better properties. Reducing the proportion of binder means significant savings for the paper manufacturer.

De gode reologiske egenskaper til kalsiumkarbonat muliggjørThe good rheological properties of calcium carbonate make it possible

å fremstille bestrykningsfarger med høyere faststoffinnhold (High Solids Coating), hvilket når det gjelder kaolin ikke er mulig. Derved fåes ved linjetørking lavere energiomkostninger, hvilket også betyr en vesentlig innsparing av omkostninger for papirfremstilleren. to produce coating colors with a higher solids content (High Solids Coating), which in the case of kaolin is not possible. As a result, line drying results in lower energy costs, which also means a significant saving in costs for the paper manufacturer.

Claims (9)

1. Kalsiumkarbonat, da spesielt naturlig kalsiumkarbonat, karakterisert ved at det tilberedes ved ma-ling og/eller klassifisering ifølge partikkelstørrelse, og at de inneholder a) 50-70 % partikler mindre enn 1 yam, b) mindre enn 10 % partikler mindre enn 0,2 yam og c) en spesifik overflate ifølge BET som er mindre enn 10 m^/g.1. Calcium carbonate, especially natural calcium carbonate, characterized in that it is prepared by grinding and/or classification according to particle size, and that they contain a) 50-70% particles smaller than 1 yam, b) less than 10% particles smaller than 0.2 yam and c) a specific surface according to BET which is less than 10 m^/g. 2. Kalsiumkarbonat ifølge krav 1, karakterisert ved at det inneholder 55-65 % partikler mindre enn 1 yam , b) mindre enn 10 % partikler mindre enn 0,2^ um og c) en spesifik overflate mindre enn 10 m^/g.2. Calcium carbonate according to claim 1, characterized in that it contains 55-65% particles smaller than 1 µm, b) less than 10% particles smaller than 0.2 µm and c) a specific surface less than 10 m^/g. 3. Kalsiumkarbonat ifølge krav 1 eller 2, karakterisert ved at det inneholder a) 60 % partikler mindre enn 1 ^um , b) mindre enn 10 % partikler mindre enn 0,2 yam og c) en spesifik overflate mindre enn 10 m^/g.3. Calcium carbonate according to claim 1 or 2, characterized in that it contains a) 60% particles smaller than 1 µm, b) less than 10% particles smaller than 0.2 µm and c) a specific surface less than 10 m^/ g. 4. Kalsiumkarbonat ifølge et av kravene 1 - 3 , karakterisert ved at det inneholder a) 60 % partikler mindre enn 1 yjm , b) 4-6 vekt-% partikler mindre enn 0,2 yum og c) en spesifik overflate mindre enn 10 m^/g.4. Calcium carbonate according to one of the claims 1 - 3, characterized in that it contains a) 60% particles smaller than 1 µm, b) 4-6% by weight particles smaller than 0.2 µm and c) a specific surface area smaller than 10 m^/g. 5. Kalsiumkarbonat ifølge et av kravene 1-4, karakterisert ved at det inneholder a) 60 % partikler mindre enn 1 yum , b) 4-6 % partikler mindre enn 0,2 yam og c) en spesifik overflate mindre enn 8 m^/g.5. Calcium carbonate according to one of claims 1-4, characterized in that it contains a) 60% particles smaller than 1 um, b) 4-6% particles smaller than 0.2 um and c) a specific surface area less than 8 m^ /g. 6. Fremgangsmåte for fremstilling av kalsiumkarbonat ifølge et av kravene 1-5, karakterisert ved at man først på i og for seg kjent måte maler tørt, og deretter foretar klassifisering etter partikkelstørrelse ved hjelp av vindsikting.6. Process for the production of calcium carbonate according to one of claims 1-5, characterized in that one first grinds dry in a manner known per se, and then classifies according to particle size using wind sifting. 7. Fremgangsmåte for fremstilling av kalsiumkarbonat ifølge et av kravene 1-5, karakterisert ved at det fremstilles på i og for seg kjent måte ved hjelp av våtmaling.7. Method for the production of calcium carbonate according to one of claims 1-5, characterized in that it is produced in a manner known per se by means of wet painting. 8. Anvendelse av kalsiumkarbonat ifølge et av kravene 1-7 som bestrykningsmiddel for LWC-dyptrykkingspapir.8. Use of calcium carbonate according to one of claims 1-7 as coating agent for LWC gravure printing paper. 9. Anvendelse av kalsiumkarbonat ifølge et av kravene 1 - 8 i suspensjon med et faststoffinnhold på 65 - 85 vekt-% for LWC-dyptrykkingspapir (High Solid Coatings).9. Use of calcium carbonate according to one of claims 1 - 8 in suspension with a solids content of 65 - 85% by weight for LWC gravure printing paper (High Solid Coatings).
NO832355A 1983-05-09 1983-06-29 Calcium carbonate, especially natural calcium carbonate NO832355L (en)

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CA1219730A (en) 1987-03-31
AT381687B (en) 1986-11-10
AU2093083A (en) 1984-11-15
NL188281C (en) 1992-05-18
FI84184C (en) 1992-10-28
JPH0259181B2 (en) 1990-12-11
ATA282083A (en) 1986-04-15
IT1172304B (en) 1987-06-18
DE3316949C3 (en) 1995-03-23
ES527196A0 (en) 1985-12-16
SE8303934L (en) 1984-11-10
GB8329759D0 (en) 1983-12-14
FR2545812A1 (en) 1984-11-16
BE897728A (en) 1984-01-02
IT8348719A0 (en) 1983-07-20
FI832279A0 (en) 1983-06-22
JPS59204662A (en) 1984-11-20
FI832279L (en) 1984-11-10
NL188281B (en) 1991-12-16
FR2545812B1 (en) 1986-03-14
GB2139606A (en) 1984-11-14
ES8602544A1 (en) 1985-12-16
NL8302549A (en) 1984-12-03
DE3316949C2 (en) 1987-01-15
FI84184B (en) 1991-07-15
GB2139606B (en) 1986-12-03
DE3316949A1 (en) 1984-11-15
AU558632B2 (en) 1987-02-05
SE8303934D0 (en) 1983-07-11

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