Fine Layered Paper Having A Soft Touch

Abstract: The invention relates to fine writing paper in particular for offset wrapping or printing said paper including a fibrous cushion having a body greater than or equal to 1.10 cm/g and at least one layer the dry deposit on one or each surface of the fibrous cushion of which is between 3 and 10 g/m and which includes at least one inorganic pigment at least one latex forming a binder and at least one aqueous polyurethane dispersion of 0.5% to 8% by dry weight in relation to the total dry weight of the pigment(s) of said layer so that the layered paper has a touch similar to that of the fibrous cushion.

Patent Information

Application #

Filing Date

28 December 2012

Publication Number

36/2014

Publication Type

INA

Invention Field

TEXTILE

Status

Email

Parent Application

Applicants

ARJO WIGGINS FINE PAPERS LIMITED

Eversheds House 70 Great Bridgewater Street Manchester M1 5ES

Inventors

1. BAUMLIN Jean Marie

8 rue Jules Leroy F 62223 Anzin Saint Aubin

Specification

Coated fine paper having a soft touch The present invention relates to a coated fine paper for writing, packaging and/or printing, in particular offset printing, and the method for 5 the preparation thereof. In the printing paper industry, papers may be characterised by the use thereof, each use corresponding to clients with a specific type of printer and corresponding to a specific marlcet. A paper industry client thus chooses, from the various papers offered, that most suitable for printing 10 with the type of printer to be used and corresponding best to requirements in terms of quality and cost. There are a number of types of printer or printing including deslar Meyer bar Meyer bar Meyer bv Meyer bar air knife air knife air knife I Bulk(cm'^) 1.37 1.33 1.33 1.33 1.33 1.33 1.17 ri9 1.23 Bendtsen roughness (ml/min) 197 195 281 258 188 182 185 1M 240 Bekk smoothness (s) 18 20 20 19 M 23 26 ^ 21 Fine paper Fine paper gtoss (%) 3.9 3.6 3.4 34 4.1 3.9 4.1 3.7 3.0 charactenstics — after coating ^^ '«!"™ ^ : different to fine paper base ^ d ^ ^ = = x x t (somewhat rough) = : similar to fine paper base (soft) PrintablWy - 4-colour offcet good good Qood Fine paper gloss after printing (%) 5^ 5j 6^ The gloss of a non-coated Conqueror Velin® fine paper (fibrous layer) is between 5 and 7%. The gloss of this paper after printing (with 100% black printing ink, density 1.5, such as the ink: K+E® NOVAVIT® "Supreme Bio" series) is between 6 and 9%. The dynamic friction 5 coefficient of each face of the fine paper was measured according to the NF-Q-03-082 standard with a 200g pad, and is 0.86. Examples 1 to 4 relate to coated fine papers not covered by the invention. The coating deposited on the fine paper in each of these examples 10 comprises calcium carbonates (as a majority) and porous amorphous silica as mineral pigments. Each coating comprises a latex as a binder, polyvinyl alcohol, a cross-linking agent and a thickener. The coatings in examples 1 to 4 are devoid of an aqueous polyurethane dispersion and comprise a wax suitable for enhancing the insertion of the fine papers in finishing machines. 15 The quantity of coating deposited on one face of each fine paper is 5g/m^ It was observed manually that the texture of the coated fine papers obtained was different to that of the original fine papers or fibrous layers. This difference in texture can be seen in the differences in Bendtsen 20 roughness and Bekk smoothness between the fibrous layers and the coated fine papers. The coating of the fine papers in examples 1 to 4 gives rise to an increase in the roughness thereof, significantly in the case of examples 3 and 4 (increase greater than or equal to 70ml/min after coating). 25 The Bekk smoothness of the fine papers decreased relatively significantly after coating (from 24 to 18s in the case of example 1), conveying an increase in the roughness of these fine papers. The relatively significant increase in the roughness of the fine papers after coating in the case of examples 1 to 4 (illustrated by the increase in 30 the Bendtsen roughness thereof or the decrease in the Bekk smoothness thereof) conveys a modification of the texture thereof. 13 Examples 5 to 8 relate to coated fine papers according to the invention. The coatings deposited on the fine papers comprise calcium carbonates and porous amorphous silica as mineral pigments in examples 5 5 and 6, and also talc in examples 7 and 8. The coatings In examples 5 and 6 comprise a latex as a binder, polyvinyl alcohol, a cross-linking agent, a thickener, and an aqueous polyurethane dispersion. The coatings in examples 7 and 8 further comprise calcium stearate. 10 The quantity of coating deposited on one face of each fine paper is 5 or 6g/m* in examples 5 to 8. The presence of the aqueous polyurethane dispersion in the pigmented coatings gives the coated fine papers in examples 5 to 8 a soft texture very similar to that of the original fine papers. Moreover, the quality 15 of the 4-colour offset printing of these coated fine papers is high in the case of examples 7 and 8. The dynamic friction coefficient of the coated fine paper in example 7 is 0.67 (measured according to the NF-Q-03-082 standard with a 200g block). The Bendtsen roughness of the fine papers in examples 5 to 8 is 20 subject to little or no modification after coating (increase of at most 1 ml/min in example 8, or decrease, after coating). Furthermore, the Bekk smoothness of these papers decreased to a small extent after coating in the case of examples 5 and 6 and even increased in the case of examples 7 and 8. This increase in the Bekk smoothness in the case of examples 7 25 and 8 could be explained by the coating technique used, which is the air knife. The small differences between the roughness or the smoothness of the fine papers before and after coating in examples 5 to 8 mean that the textures of the coated papers are similar to those of the original fibrous 30 layers. 14 Example 9 relates to a coated fine paper outside the scope of the invention. The coating deposited on the fine paper does not comprise an aqueous polyurethane dispersion, and the coated fine paper obtained has a 5 different texture to the fine paper base (illustrated by a significant increase in the Bendtsen roughness thereof by 52ml/min). In conclusion, the coated fine papers according to the invention has a similar Bendtsen roughness and Bekk smoothness to those of the noncoated fine papers or fibrous layers and thus retain the original soft texture 10 thereof. 15 CLAIMS 1. Fine paper for writing, packaging and/or printing, in particular offeet printing, comprising a fibrous layer having a bulk greater than or equal to 5 1.10cm^/g and at least one coating, said coating having a dry deposition on one or each face of the fibrous layer that is between 3 and 10g/nn^ and comprising: - at least one mineral pigment, - at least one latex acting as a binder, and 10 - at least one aqueous polyurethane dispersion at a rate of 0.5 to 8% dry weight with respect to the dry weight of pigment(s) of the layer. 2. Fine paper according to claim 1, characterised In that the or each coating comprises calcium carbonate and/or kaolin. 3. Fine paper according to claim 2, characterised in that the or each 15 coating comprises 50 to 95%, preferably 60 to 90%, and more preferentially 60 to 70%, dry weight of calcium carbonate with respect to the total dry weight of pigments of the coating. 4. Fine paper according to claim 2 or 3, characterised in that the or each coating further comprises talc and/or porous amorphous silica. 20 5. Fine paper according to claim 4, characterised in that the or each coating comprises 5 to 50%, preferably 15 to 40%, and more preferentially 20 to 30%, dry weight of talc with respect to the total dry weight of pigments of the coating. 6. Fine paper according to claim 4 or 5, characterised in that the or 25 each coating comprises 1 to 15%, preferably 4 to 12%, and more preferentially 6 to 10%, dry weight of porous amorphous silica with respect to the total dry weight of pigments of the coating. 7. Fine paper according to any one of the above claims, characterised in that the or each coating further comprises at least one dye, and/or at 30 least one optical brightener, and/or at least one wax, and/or starch, and/or 16 at least one polyvinyl alcohol, and/or at least one cross-linking agent, and/or at least one thickener. 8. Fine paper according to any one of the above claims, characterised in that the or each coating comprises calcium stearate, preferably at a rate 5 between 0.3 and 3% dry weight with respect to the total dry weight of pigment(s) of the coating. 9. Fine paper according to any one of the above claims, characterised in that the dry deposition of the or each coating is between 5 and 7g/m^, and is preferably about 6g/m^. 10 10. Fine paper according to any one of the above claims, characterised in that the aqueous polyurethane dispersion is present in the or each coating at a rate of 1 to 6%, and preferably 1 to 5%, dry weight with respect to the total dry weight of pigment(s). 11. Fine paper according to any one of the above claims, characterised 15 in that the aqueous polyurethane dispersion Is an aqueous non-ionic polyurethane dispersion. 12. Fine paper according to any one of the above claims, characterised in that the or each coating comprises: - at least 60% dry weight of calcium carbonate and between 4 and 12% dry 20 weight of porous amorphous silica, with respect to the total dry weight of pigments of the coating, - between 1 and 6% dry weight of aqueous polyurethane dispersion with respect to the total dry weight of pigments of the coating, and - between 1 and 10% dry weight of latex with respect to the total dry weight 25 of pigments of the coating. 13. Fine paper according to claim 12, characterised in that the or each coating comprises between 20 and 30% dry weight of talc with respect to the total dry weight of pigments of the coating. 14. Fine paper according to claim 12, characterised in that the or each 30 coating comprises at least 90% dry weight of calcium carbonate and not more than 10% dry weight of porous amorphous silica, with respect to the total dry weight of pigments of the coating. 15. Fine paper according to any one of the above claims, characterised in that it has on the or each coated face thereof a degree of gloss between 5 2 and 7%, and preferably between 3 and 6%. 16. Fine paper according to any one of the above claims, characterised in that the coated face thereof or each coated face thereof is printed with and has a degree of gloss after printing between 6 and 9%. 17. Method for preparing fine paper according to any one of the above 10 claims, characterised in that it comprises a step consisting of depositing the or each coating on the fibrous layer by means of curtain or air knife coating or using a Meyer bar. 18. Method according to claim 17, characterised in that the fine paper is calendered after coating.

Documents

Application Documents

#	Name	Date
1	11342-DELNP-2012.pdf	2013-01-07
2	11342-delnp-2012-Correspondence-Others-(05-02-2013).pdf	2013-02-05
3	11342-delnp-2012-Form-3-(19-02-2013).pdf	2013-02-19
4	11342-delnp-2012-Correspondence Others-(19-02-2013).pdf	2013-02-19
5	Correspondence Others-(07-03-2013).pdf	2013-03-07
6	11342-delnp-2012-Form-5.pdf	2013-08-20
7	11342-delnp-2012-Form-3.pdf	2013-08-20
8	11342-delnp-2012-Form-2.pdf	2013-08-20
9	11342-delnp-2012-Form-1.pdf	2013-08-20
10	11342-delnp-2012-Drawings.pdf	2013-08-20
11	11342-delnp-2012-Description(Complete).pdf	2013-08-20
12	11342-delnp-2012-Correspondence-others.pdf	2013-08-20
13	11342-delnp-2012-Claims.pdf	2013-08-20
14	11342-delnp-2012-Abstract.pdf	2013-08-20