EP0365502A2 - Verfahren zur Erzeugung einer Pigmentmischung für Papierbeschichtung - Google Patents
Verfahren zur Erzeugung einer Pigmentmischung für Papierbeschichtung Download PDFInfo
- Publication number
- EP0365502A2 EP0365502A2 EP89850344A EP89850344A EP0365502A2 EP 0365502 A2 EP0365502 A2 EP 0365502A2 EP 89850344 A EP89850344 A EP 89850344A EP 89850344 A EP89850344 A EP 89850344A EP 0365502 A2 EP0365502 A2 EP 0365502A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- talc
- mix
- coating
- paper
- component
- 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.)
- Withdrawn
Links
- 239000011248 coating agent Substances 0.000 title claims abstract description 48
- 238000000576 coating method Methods 0.000 title claims abstract description 48
- 239000000049 pigment Substances 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 title description 4
- 239000000454 talc Substances 0.000 claims abstract description 39
- 229910052623 talc Inorganic materials 0.000 claims abstract description 39
- 239000004927 clay Substances 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 35
- 239000002002 slurry Substances 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims description 44
- 239000007787 solid Substances 0.000 claims description 32
- 239000000843 powder Substances 0.000 claims description 2
- 239000006185 dispersion Substances 0.000 claims 1
- KNXVOGGZOFOROK-UHFFFAOYSA-N trimagnesium;dioxido(oxo)silane;hydroxy-oxido-oxosilane Chemical compound [Mg+2].[Mg+2].[Mg+2].O[Si]([O-])=O.O[Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O KNXVOGGZOFOROK-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000003490 calendering Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000004816 latex Substances 0.000 description 2
- 229920000126 latex Polymers 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
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
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
Definitions
- the present invention concerns a method for producing a pigment mix to be used in paper web coating, in which method a water slurry containing talc and at least one additional component is prepared.
- Coating of base paper with a coating mix containing only fine-dispersed talc pigment results in very good paper quality parameters in coated papers, particularly for the printability of the paper.
- talc-based coating for the improvement of opacity at low coat weights are based on the use of different kinds of auxiliary pigments.
- the most common auxiliary pigment is calcined clay.
- calcined clay renders good quality characteristics to the paper, improving both opacity and printability by 100% in comparison with a simple talc coating.
- the calcined clay is dispersed into a water slurry with max. 50...52 % solids, after which the calcined clay slurry is mixed with a talc slurry of 65...67 % solids.
- the minimum proportion of calcined clay needed in order to attain a noticeable improvement in the above mentioned paper quality parameters is approx. 10 % of the total pigment solids. Due to the high price of calcined clay the tendency has been to minimize the proportion of clay in the pigment mix formula.
- the present invention aims to achieve a novel method for producing a pigment mix containing talc, whereby the quantity of the component in the mix, such as calcined clay or the like, can be essentially reduced from conventionally applied levels without subsequently lowering the quality parameters of the coated paper obtained by this method.
- the invention is characterized by first dispersing talc into the water and thereafter dispersing the second component of the mix in dry form directly into the talc slurry obtained in the first stage.
- a coating mix made into a mixtured slurry containing talc and calcined clay using the method according to the invention features an appreciably higher efficiency of the calcined clay as an unsealant of the compact talc coating in comparison with its function in a pigment mix of separately produced slurries that is prepared by a separate slurrying of the calcined clay and talc prior to their later mixing.
- the pigment mix prepared by the direct mixing method is found to improve the above mentioned paper quality parameters significantly in comparison with those obtained using a coating mix prepared from separately pre-made slurries. The degree of improvement will be evidenced by the exemplifying cases to be described later.
- the use of other pigments, particularly calcined talc, for the preparation of the mix is conceivable within the scope of the invention.
- the exemplifying cases to be described later indicate that the direct mixing method according to the invention improves the paper properties both in papers coated with coating mixes of conventional formulas containing uncalcined and calcined talc as well as in papers coated with coating mixes containing talc and calcined clay.
- a coating mix containing talc and a second component, such as calcined clay can be prepared using the direct mixing method so that calcined clay powder is mixed into the ready-dispersed talc pigment slurry (with 65...67 % solids), and when required, water is added for the control of final solids content.
- the proportion of calcined clay is 2...20 %, preferably 5...10 %, of the total solids.
- the final solids in the slurry prepared in this method is 50...70 %, preferably 55...65 %.
- the invention is clarified in the following by comparing the results obtained for coating mixes produced by the direct mixing method according to the invention with the results obtained for conventionally prepared coating mixes.
- Coating mixes were made from both a slurry prepared in the method according to the invention to contain talc and calcined clay as well as from a slurry prepared in the conventional method; in the preparation the slurries were complemented with the required adhesive (5 parts of alkali-expandable acrylic latex), while the solids of the slurries was adjusted to 50 % by adding water.
- the coating mix was applied on the base paper in a laboratory coating machine using a web speed of 400 m/min.
- the paper sheet was calendered in a laboratory calender (having five nips) using a linear calendering force of 230 kN/m at 25 °C temperature and 5 % humidity of paper web.
- the paper quality parameters of the paper sheet samples coated with different coat weights were computed by interpolation to correspond to coat weights 5.5 and 6.5 g/m2.
- Table 1 Effect of final solids content of talc- and calcined clay-containing coating mix obtained with the direct mixing method on the opacity and printability of coated paper.
- Test point 1 2 3 4 5 6 DIRECT MIXING METHOD Finntalc C10 95 95 90 90 85 85 Calcined clay 5 5 10 10 15 15 Final solids of coating mix (%) 67 55 67 55 67 55 COAT WEIGHT 5.5 g/m2 Opacity (%) 85.3 85.0 85.8 85.8 85.6 86.1
- Heliotest (mm) 84 87 91 90 82 103 COAT WEIGHT 6.5 g/m2 Opacity (%) 86.0 85.7 86.4 86.4 86.0 86.7 Heliotest (mm) 90 92 95 97 92 109
- Test point 1 2 3 4 5 6 DIRECT MIXING METHOD Finntalc C10 95 90 85 Calcined clay 5 10 15 Final solids of coating mix (%) 67 67 55 SEPARATE SLURRYING METHOD Finntalc C10 95 90 85 - solids: 65.5 % Calcined clay 5 10 15 - solids: 50 % Final solids of coating mix (%) 64.7 63.5 62.6 COAT WEIGHT 5.5 g/m2 Opacity (%) 85.3 85.8 86.1 84.8 85.2 85.8 Heliotest (mm) 84 91 103 77 86 86 COAT WEIGHT 6.5 g/m2 Opacity (%) 86.0 86.4 86.7 85.3 85.7 86.4 Heliotest (mm) 90 94 109 85 91 92
- the above results show that equal paper quality level is achieved by directly mixed coating mixes when using 10 parts of calcined clay, while a mix containing 5 parts of calcined clay results. in an almost equal quality level.
- the direct mixing method makes it possible to use a higher solids content of the coating mix when the proportion of calcined clay is below 15 parts.
- Coating mixes were made from both a slurry prepared in the method according to the invention to contain talc and calcined clay as well as from a slurry prepared in the conventional method; in the preparation the slurries were complemented with the required adhesive (6 parts of alkali-expandable acrylic latex), while the solids of the slurries was adjusted to 50 % by adding water.
- the coating mix was applied on the base paper in laboratory coating machine using a web speed of 400 m/min.
- the paper sheet was calendered in a laboratory calender (having five nips) using a linear calendering force of 230 kN/m at 25 °C temperature and 5 % humidity of paper web.
- Test point 1 2 3 4 5 6 DIRECT MIXING METHOD Finntalc C10 95 95 90 90 85 85 Calcined talc 5 5 10 10 15 15 Final solids of coating mix (%) 65 55 65 55 65 55 COAT WEIGHT 5.5 g/m2 Opacity (%) 85.5 86.6 85.8 86.2 86.4 86.9 Heliotest (mm) 85 88 84 87 78 90 COAT WEIGHT 6.5 g/m2 Opacity (%) 86.2 86.7 86.6 87.1 87.0 87.1 Heliotest (mm) 86 90 87 92 85 98
- Test point 1 2 3 4 5 6 DIRECT MIXING METHOD Finntalc C10 95 90 85 Calcined talc 5 10 15 Final solids of coating mix (%) 55 55 55 SEPARATE SLURRYING Finntalc C10 95 90 85 - solids: 65.5 % Calcined clay 5 10 15 - solids: 50 % Final solid of coating mix (%) 64.7 63.5 62.6 COAT WEIGHT 5.5 g/m2 Opacity (%) 86.6 86.7 86.9 86.0 86.2 86.6 Heliotest (mm) 88 89 90 85 85 87 COAT WEIGHT 6.5 g/m2 Opacity (%) 87.0 87.1 87.2 86.4 86.7 87.2 Heliotest (mm) 90 92 98 88 91 95
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Paper (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI884843A FI83897C (fi) | 1988-10-20 | 1988-10-20 | Foerfarande foer framstaellning av en pigmentblandning foer bruk vid ytbelaeggning av papper. |
| FI884843 | 1988-10-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0365502A2 true EP0365502A2 (de) | 1990-04-25 |
| EP0365502A3 EP0365502A3 (de) | 1992-01-02 |
Family
ID=8527234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19890850344 Withdrawn EP0365502A3 (de) | 1988-10-20 | 1989-10-11 | Verfahren zur Erzeugung einer Pigmentmischung für Papierbeschichtung |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0365502A3 (de) |
| FI (1) | FI83897C (de) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001059215A1 (en) * | 2000-02-11 | 2001-08-16 | Raisio Chemicals Ltd | Coating composition, its use, and a method for making it |
| JP2018512496A (ja) * | 2015-03-27 | 2018-05-17 | イメリーズ ミネラルズ リミテッド | 無機スラリー |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI100860B (fi) * | 1994-12-16 | 1998-03-13 | Megatrex Oy | Menetelmä ja laitteisto hienojakoisten aineiden liettämiseksi nesteese en |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL6617740A (de) * | 1965-12-16 | 1967-06-19 | ||
| FI70805B (fi) * | 1984-03-30 | 1986-07-18 | Myllykoski Oy | Foerfarande foer dispergering av talk |
-
1988
- 1988-10-20 FI FI884843A patent/FI83897C/fi not_active IP Right Cessation
-
1989
- 1989-10-11 EP EP19890850344 patent/EP0365502A3/de not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001059215A1 (en) * | 2000-02-11 | 2001-08-16 | Raisio Chemicals Ltd | Coating composition, its use, and a method for making it |
| JP2018512496A (ja) * | 2015-03-27 | 2018-05-17 | イメリーズ ミネラルズ リミテッド | 無機スラリー |
Also Published As
| Publication number | Publication date |
|---|---|
| FI884843A0 (fi) | 1988-10-20 |
| FI83897C (fi) | 1991-09-10 |
| EP0365502A3 (de) | 1992-01-02 |
| FI884843L (fi) | 1990-04-21 |
| FI83897B (fi) | 1991-05-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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| AK | Designated contracting states |
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| 17P | Request for examination filed |
Effective date: 19920530 |
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| 17Q | First examination report despatched |
Effective date: 19930426 |
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| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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| 18D | Application deemed to be withdrawn |
Effective date: 19931006 |