WO2001068980A1 - Suspensión acuosa que proporciona una elevada opacidad al papel - Google Patents
Suspensión acuosa que proporciona una elevada opacidad al papel Download PDFInfo
- Publication number
- WO2001068980A1 WO2001068980A1 PCT/ES2001/000098 ES0100098W WO0168980A1 WO 2001068980 A1 WO2001068980 A1 WO 2001068980A1 ES 0100098 W ES0100098 W ES 0100098W WO 0168980 A1 WO0168980 A1 WO 0168980A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- calcium sulfate
- additive
- paper
- aqueous suspension
- water
- Prior art date
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
- 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
-
- 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
-
- 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
- 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
- D21H21/285—Colorants ; Pigments or opacifying agents insoluble
Definitions
- the present invention falls within the field of papermaking and refers to an aqueous suspension for the addition to the pulp of cellulosic fibers, comprising hydrated calcium sulfate and an additive.
- Calcium sulfate includes any compound that responds to the formula CaS0 4 n H 2 0 where n is the number of moles and that comprises a value that goes from 0 to 2 or even higher.
- calcium sulfate has a low opacifying power of the paper and, therefore, the addition of calcium sulfate to the cellulosic fiber suspension in the paper preparation, even in amounts greater than 30% by weight, does not opacify the paper thus. obtained to a sufficient extent to make it particularly suitable for printing. That is, the maximum amount of calcium sulfate that can be added with respect to the amount of cellulose is not sufficient to give the paper a sufficiently high degree of opacity.
- Suitable additives for the present invention include: kaolin, calcium carbonate, talc, titanium dioxide, aluminum silicate, calcium silicate, other silicates and / or mixtures thereof, as described below.
- the present invention relates to an aqueous suspension for the addition to the pulp of cellulosic fibers in the paper preparation comprising n-hydrated calcium sulfate (CaS0 4 nH 2 0), the value of n being comprised between 0 and 2 (0 ⁇ n ⁇ 2) and an additive.
- n-hydrated calcium sulfate CaS0 4 nH 2 0
- Said additive is selected from kaolin, calcium carbonate, talc, titanium dioxide, silicate aluminum, calcium silicate, other silicates and / or mixtures thereof
- the present invention also relates to a process for preparing said aqueous suspension comprising hydrated calcium sulfate and an additive.
- the present invention also refers to a process for obtaining paper comprising the preparation of said aqueous suspension comprising n hydrated calcium sulfate, between 0 and 2, and at least one additive, and the addition of said suspension to the aqueous suspension of cellulosic fibers for papermaking.
- calcium sulfates with different degrees of hydration can be used, except natural anhydrous calcium sulfate.
- There are two types of calcium sulfates with n 0: the natural anhydrous and the artificial anhydrous.
- artificial anhydrous calcium sulfate which comes from calcium sulfate dihydrate, to which 2 moles of water have been removed by heat, can be used in the present invention, simply requiring more time and more agitation speed to obtain a suspension. aqueous according to the invention.
- the n-hydrated calcium sulfate (CaS0 4 nH 2 0), and the additive or additives are in a weight ratio between 100: 1 and 1: 1, preferably between 50: 1 and 2 :one.
- the ratio between the mixture of hydrated calcium sulfate and the additive or additives with respect to water is comprised between 0.1% and 80% by weight, preferably between 1% and 25%. % in weigh.
- the optimum pH value of said suspension is between 3 and 9, preferably between 4 and 8.
- the present invention also refers to a process for preparing an aqueous suspension comprising n hydrated calcium sulfate, with n between 0 and 2 (0 ⁇ n ⁇ 2) and at least one additive according to the invention.
- Said process comprises 1) Mixing said calcium sulfate and at least one of said additives with water; and 2) Homogenize the mixture under strong stirring.
- said calcium sulfate and said additive are mixed together dry before mixing with water.
- said calcium sulfate and said additive are added to the water separately.
- the present invention also relates to a process for the preparation of paper characterized by the fact that an aqueous suspension of at least one additive and previously prepared hydrated calcium sulfate is added to the cellulosic fiber solution.
- Said process comprises the following steps: 1) Preparation of a suspension according to the invention as described above; 2) Preparation of a suspension of cellulosic fibers in water; 3) Addition of the suspension according to the invention to the suspension of cellulosic fibers in the paper circuit.
- said calcium sulfate and at least one of said additives are kept in suspension with stirring until they are added to the cellulose pulp.
- the stirring time depends on the type of calcium hydrate n hydrate used and the type of additive or additives and is generally equal to or greater than 30 minutes.
- the paper preparation process according to the present invention allows obtaining high opacity paper at a low cost.
- said calcium sulfate is added together with at least one water additive to make an aqueous suspension according to the present invention, said compound is hydrated, to a greater or lesser extent depending on the value of n.
- GRANULOMETRY 25% ⁇ 2 ⁇ m and without filtered residue at 50 ⁇ m
- Additive talc, calcium carbonate, kaolin or titanium dioxide
- the CaS0 4 and / or the additive are added to the water while stirring at 3000 rpm and stirring is continued for at least 30 minutes before adding it to the fibrous suspension.
- the preparation of said dispersion is carried out in a "Pulper” or laboratory disintegrator for 2 hours.
- 2-Samples of the prepared solution are collected by means of a standardized container, in order to always collect the same amount of paste dispersed at 1 + 0.01%. This amount is 37,478 grams.
- 3-A second dilution of the cellulose pulp is made. To do this, 37.478g of 1% paste are homogenized with 400g of water: a) Saturated Calcium Sulfate in the tests where the load comprises calcium sulfate. b) Deionized otherwise.
- the dilution is carried out in a laboratory magnetic stirrer at 1100 rpm for 40 seconds.
- 0.37478 x 15/100 0.0562 g load (dry), ie 0.562 g load at 10%; which represents an 11.55% charge on the total solid.
- the filter used is a cellulose triacetate membrane of pore size of 0.2 microns, small enough to avoid losses.
- the filter + paper sheet with Buchner clamps is removed, and placed in an oven at 80 ° C with forced air recirculation to constant weight.
- Both the prepared sheet of paper and the filter have a diameter of 9.20 cm and the opacity of the set is measured in 5 different points of the circumference: in the center and in 4 equidistant points halfway between the center of the sheet and the circumference perimeter.
- the difference between the total opacity (from the paper to the filter +) and the opacity corresponding to the filter must be calculated.
- Op (P + F) opacity of the paper + filter
- Op F opacity of the filter
- Op P opacity of the paper sheet.
- the following table shows the increase in the opacifying power of calcium sulfate (CaS0 4 x 0.3 H 2 0) by preparing and adding said calcium sulfate together with an additive (in the case of 30% of calculated load on dry cellulose ).
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Paper (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2001240698A AU2001240698A1 (en) | 2000-03-16 | 2001-03-14 | Aqueous suspension providing high opacity to paper |
CA002402971A CA2402971A1 (en) | 2000-03-16 | 2001-03-14 | Aqueous suspension providing a high degree of opacity paper |
EP01911767A EP1264931A1 (en) | 2000-03-16 | 2001-03-14 | Aqueous suspension providing high opacity to paper |
US11/431,959 US20060201646A1 (en) | 2001-03-14 | 2006-05-11 | Aqueous suspension providing high opacity to paper |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES200000636A ES2169987B1 (es) | 2000-03-16 | 2000-03-16 | Suspension acuosa que proporciona una elevada opacidad al papel. |
ESP200000636 | 2000-03-16 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/431,959 Continuation-In-Part US20060201646A1 (en) | 2001-03-14 | 2006-05-11 | Aqueous suspension providing high opacity to paper |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001068980A1 true WO2001068980A1 (es) | 2001-09-20 |
Family
ID=8492730
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/ES2001/000098 WO2001068980A1 (es) | 2000-03-16 | 2001-03-14 | Suspensión acuosa que proporciona una elevada opacidad al papel |
Country Status (6)
Country | Link |
---|---|
US (1) | US20030047296A1 (es) |
EP (1) | EP1264931A1 (es) |
AU (1) | AU2001240698A1 (es) |
CA (1) | CA2402971A1 (es) |
ES (1) | ES2169987B1 (es) |
WO (1) | WO2001068980A1 (es) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060201646A1 (en) * | 2001-03-14 | 2006-09-14 | Savicell Spa | Aqueous suspension providing high opacity to paper |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3306478A1 (de) * | 1982-12-30 | 1984-07-12 | Bern 8700 Würzburg Lüchtrath | Fuellstoff fuer einen papier-, karton oder pappenartigen werkstoff und verfahren zur herstellung solcher werkstoffe |
WO1993002963A1 (fr) * | 1991-08-02 | 1993-02-18 | Prayon-Rupel Technologies | Procede de preparation d'une suspension aqueuse a base de sulfate de calcium |
EP0757971A1 (en) * | 1995-01-31 | 1997-02-12 | Compania General Yesera, S.A. | Process for obtaining a charge of dihydrate calcium sulfate in the form of acicular crystals and utilization in the paper making industry |
US5736008A (en) * | 1993-04-08 | 1998-04-07 | Congoleum Corporation | Fibrous-reinforced sheet |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3642511A (en) * | 1968-10-10 | 1972-02-15 | Morris I Cohn | Method of treating wollastonite with acid and the pigment product formed thereby |
DE3106631A1 (de) * | 1981-02-23 | 1982-09-16 | G.G.V. S.A., Rubi, Barcelona | Streichfarbenmasse fuer die herstellung von papier |
SE461860B (sv) * | 1989-02-13 | 1990-04-02 | Mo Och Domsjoe Ab | Foerfarande foer framstaellning av papper och bestruket papper varvid baspappret innehaaller precipiterat kalciumkarbonat |
ES2095184B1 (es) * | 1994-07-15 | 1997-09-01 | Compania General Yesera S A | Procedimiento para la obtencion de una carga radial especialmente para uso en la industria papelera, producto de carga formado por cocristalizacion de sulfatos de calcio anhidro y hemihidrato y composicion util para la preparacion de dicha carga. |
US6406594B1 (en) * | 1997-07-18 | 2002-06-18 | Boise Cascade Corporation | Method for manufacturing paper products comprising polymerized mineral networks |
-
2000
- 2000-03-16 ES ES200000636A patent/ES2169987B1/es not_active Expired - Fee Related
-
2001
- 2001-03-14 US US10/221,713 patent/US20030047296A1/en not_active Abandoned
- 2001-03-14 AU AU2001240698A patent/AU2001240698A1/en not_active Abandoned
- 2001-03-14 WO PCT/ES2001/000098 patent/WO2001068980A1/es active Application Filing
- 2001-03-14 EP EP01911767A patent/EP1264931A1/en not_active Withdrawn
- 2001-03-14 CA CA002402971A patent/CA2402971A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3306478A1 (de) * | 1982-12-30 | 1984-07-12 | Bern 8700 Würzburg Lüchtrath | Fuellstoff fuer einen papier-, karton oder pappenartigen werkstoff und verfahren zur herstellung solcher werkstoffe |
WO1993002963A1 (fr) * | 1991-08-02 | 1993-02-18 | Prayon-Rupel Technologies | Procede de preparation d'une suspension aqueuse a base de sulfate de calcium |
US5736008A (en) * | 1993-04-08 | 1998-04-07 | Congoleum Corporation | Fibrous-reinforced sheet |
EP0757971A1 (en) * | 1995-01-31 | 1997-02-12 | Compania General Yesera, S.A. | Process for obtaining a charge of dihydrate calcium sulfate in the form of acicular crystals and utilization in the paper making industry |
Also Published As
Publication number | Publication date |
---|---|
CA2402971A1 (en) | 2001-09-20 |
US20030047296A1 (en) | 2003-03-13 |
AU2001240698A1 (en) | 2001-09-24 |
ES2169987B1 (es) | 2003-11-16 |
EP1264931A1 (en) | 2002-12-11 |
ES2169987A1 (es) | 2002-07-16 |
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