RU2306375C1 - Method for manufacture of ink-jet printing paper with pigment coat and ink-jet printing paper with pigment coat - Google Patents

Abstract

FIELD: production of ink-jet printing paper with special pigment coat applied thereto.

SUBSTANCE: method involves manufacturing paper-base; applying onto one side of paper-base ink-perceptive coat consisting of pigment, binder and cationic fixative; applying onto opposite side of paper-base curling-preventive coat; refining both surfaces of paper; using mixture of amorphous silicon dioxide and calcium or kaolin carbonate as ink perceptive pigment for coat, said mixture having specific outer surface less than 20 m²/g in the ratio of (75-45):(25-55); using polyvinyl alcohol as binder in an amount of 20-25% by weight of pigment; using polydiallyl dimethylammonium chloride as cationic fixative.

EFFECT: improved printing characteristics and increased paper surface strength.

3 cl, 1 tbl, 7 ex

Description

The invention relates to the pulp and paper industry, in particular to the production of inkjet paper coated with a special pigment coating.

It is known that strict requirements are imposed on inkjet paper, since printing is carried out with water-based inks, and the paper must provide high print quality and quick drying of the ink, that is, have properties that are simultaneously difficult to achieve.

A significant amount of paper intended for inkjet printing is coated with special coatings of various composition to achieve certain characteristics in inkjet printing, many of which depend on the type and processing of paper.

Obtaining full-color images by inkjet printing with full filling of the sheet area requires the following properties - the ability to firmly fix the ink dye on the surface of the material and quickly absorb the liquid phase of the ink into the coating material without deformation. Such requirements are due to the fact that ink is used on ink based either on aqueous solutions of dyes or on the basis of dispersions of dyes in a suitable liquid for this.

Lack of fixation of the ink dye on the coating surface leads to a decrease in the optical density of the image, and insufficiently fast absorption of the liquid phase of the ink by the coating material leads to defects such as color mixing, spreading when printing lines and small details, which makes the image blurry and fuzzy.

Coatings that satisfy these requirements are obtained by applying formulations, the main component of which is artificial amorphous silica gel (silicon dioxide). The use of silica gels, by virtue of their nature, creates difficulties in obtaining a high coating strength, therefore, attempts are constantly being made to eliminate this drawback by modifying the coating composition.

A common method for increasing the strength of the coating layer is the introduction of an additional pigment, kaolin or calcium carbonate, into the coating formulation.

A known method of manufacturing paper for inkjet printing with a pigment coating, comprising applying to the base paper a coating containing a pigment, colloidal or amorphous silicon dioxide, calcium carbonate, aluminosilicate and latex binder, not completely coalescing during the drying process. A similar composition and drying mode allows you to get paper that gives good print quality, quick drying of the ink and having a solid surface (PCT / US94 / 04140).

A known method of manufacturing paper for inkjet printing with a pigmented coating, comprising preparing and applying to the substrate a coating composition consisting of polyvinylpyrrolidone, a copolymer of pyrrolidone and vinyl acetate, and pigment kaolin, calcium carbonate, zinc oxide, barium sulfate, aluminosilicates. The resulting paper has good printability (US Patent # 4.371.582.)

The closest analogue to the technological essence of the claimed technical solution is a method of manufacturing paper for inkjet printing with a pigment coating, comprising obtaining a base paper, coating it with a perceiving ink containing a latex binder, a water-soluble binder (polyvinyl alcohol), an amorphous silica pigment , an agent for fixing ink, the subsequent application of anti-curling coating on the opposite side of the base paper and the refinement of the coating, perception ink (RU 2264493 C1 of 11/23/2005).

In this case, a mixture of amorphous silicon dioxide with colloidal amorphous silicon dioxide and aluminum oxide is used as a pigment at a ratio of 80-85 / 10-15 / 5-10. The coating is carried out in two stages, and the refining of the coating, perceiving ink, is carried out by its supercalanding.

The paper obtained in a known manner, has a high surface strength and good fixability of water-based paints.

However, operating only with the type of latex as a binder and the pigment / latex ratio, it is impossible to obtain the necessary spectrum of printing and strength properties of the coating.

A new technical result from the use of the proposed technical solution is to obtain high surface strength and printed characteristics of the paper.

A new technical result is achieved by the fact that in the method of manufacturing paper for inkjet printing with a pigment coating, comprising obtaining a base paper, applying successively on one side of the coating, receiving ink, consisting of a pigment and a binder, and then a cationic fixative, and on the other side base paper — an anti-rolling coating, after which the coating is refined by supercalendering, and a mixture of amorphous dioxi silicon with kaolin or calcium carbonate having a specific surface area of particles <20 m ² / g in the ratio (75-45) :( 25-55), and polyvinyl alcohol in the amount of 20-25% by weight of the pigment is used as a binder.

A mixture of amorphous silicon dioxide with kaolin or calcium carbonate having a specific surface area of particles <20 m ² / g in the ratio (75-45) :( 25-55) is used as a pigment for a coating that accepts ink.

A water-soluble binder, polyvinyl alcohol, is used as a binder to fix the pigment on the surface of the paper.

In order to fix the dye during printing after coating the ink with a coating on the paper, it is treated with a cationic fixative - polydiallyldimethylammonium chloride.

The ink sensing coating is applied to the base paper in one or two stages. The total coating weight of 7-18 g / m ² .

Then a cationic fixative solution is applied to the same side of the paper.

The refining of the ink receiving coating is carried out by finishing finishing the finished paper in supercalender at a pressure in the gap of the calender rolls of 20-75 bar.

Another object of the present invention relates to inkjet paper with a pigment coating, manufactured by the proposed method and characterized by high surface strength.

The proposed method for manufacturing inkjet paper is presented by the following examples (1-7).

Example No. 1

A method of manufacturing paper for inkjet printing is as follows.

1. The base paper weighing 65-200 g / m ² receive a wet method on a paper machine using the following composition in wt.%:

bleached sulfate hardwood pulp - 45-70%;

bleached sulfate softwood pulp - 30-50%;

calcium carbonate - 10% (by weight of cellulose);

AKD glue - 0.3-0.5% (by weight of cellulose);

cationic starch - 0.6-1.0% (by weight of cellulose);

optical brightener - 0.2-0.6% (by weight of cellulose);

dye - 10-25 g / t of cellulose.

2. Preparation of the composition for the coating, perceiving ink, with a concentration of 17-25%, the following composition (wt.% On dry matter by weight of the pigment):

pigment - 100%;

polyvinyl alcohol - 25%;

dye - 0.014%;

optical brightener - 4-7%.

A crosslinking agent based on polyhydroxyl resins - 2-5% (wt.% On dry matter by weight of the pigment).

The finished mixture is applied with an air scraper in one or two stages, the coating weight is 12-17 g / m ² .

In this case, a mixture of amorphous silicon dioxide with kaolin having a specific particle surface size of less than 20 m ² / g in a ratio of 75-: 25 is used as a pigment.

Drying of the coating is carried out using infrared emitters and by blowing with hot air (air temperature 90-130 ° C).

3. Application of cationic fixative.

A 2-3% solution of polydiallyldimethylammonium chloride is applied to the surface of the ink-receiving coating using an air scraper.

Drying of the coating is carried out using infrared emitters and by blowing with hot air (air temperature 90-130 ° C).

4. Application of anti-twisting composition having the following composition (wt.% On dry matter by weight of the pigment):

pigment - 100%;

styrene-butadiene latex - 12%;

polyvinyl alcohol - 2.5%;

caustic soda - 0.14%;

sodium pyrophosphate - 0.45%.

The anti-twisting coating is applied in one step on a coating machine equipped with application units with an air scraper. The weight of the finished coating is 12-17 g / m ² . Drying of the coating is carried out by blowing with hot air (air temperature 90-130 ° C).

After applying all the coatings, an ink-receiving coating is refined. The refinement consists in finishing the paper on a supercalender at a pressure in the gripping rolls of 20-75 bar.

The resulting inkjet paper samples were printed on HP PHOTOSMART 8153 and Epson StylusPhoto 935 printers. All samples showed good image quality and high resistance to mechanical damage.

Example No. 2

A method of manufacturing paper for inkjet printing is carried out analogously to example 1 with the only difference that:

- as a pigment using a mixture of amorphous silicon dioxide with kaolin having a specific surface area of particles of less than 20 m ² / g in a ratio of 65:35.

The resulting inkjet paper samples were printed on HP PHOTOSMART 8153 and Epson StylusPhoto 935 printers.

Example No. 3

A method of manufacturing paper for inkjet printing is carried out analogously to example 1 with the only difference that:

- as a pigment using a mixture of amorphous silicon dioxide with kaolin having a specific surface area of particles less than 20 m ² / g in a ratio of 55:45;

- the amount of polyvinyl alcohol in the composition of the coating composition of 23%.

The resulting inkjet paper samples were printed on HP PHOTOSMART 8153 and Epson StylusPhoto 935 printers.

Example No. 4

A method of manufacturing paper for inkjet printing is carried out analogously to example 1 with the only difference that:

- as a pigment using a mixture of amorphous silicon dioxide with kaolin having a specific surface area of particles less than 20 m ² / g in a ratio of 45:55;

- the amount of polyvinyl alcohol in the composition of the coating composition of 23%.

The resulting inkjet paper samples were printed on HP PHOTOSMART 8153 and Epson StylusPhoto 935 printers.

Example No. 5

A method of manufacturing paper for inkjet printing is carried out analogously to example 1 with the only difference that:

- as a pigment, a mixture of amorphous silicon dioxide with calcium carbonate having a specific particle surface size of less than 20 m ² / g in a ratio of 65:35 is used.

The resulting inkjet paper samples were printed on HP PHOTOSMART 8153 and Epson StylusPhoto 935 printers.

Example No. 6

A method of manufacturing paper for inkjet printing is carried out analogously to example 1 with the only difference that:

- as a pigment using a mixture of amorphous silicon dioxide with calcium carbonate having a specific surface area of particles of less than 20 m ² / g in a ratio of 55:45;

- the amount of polyvinyl alcohol in the composition of the coating composition is 28%.

The resulting inkjet paper samples were printed on HP PHOTOSMART 8153 and Epson StylusPhoto 935 printers.

Example No. 7

A method of manufacturing paper for inkjet printing is carried out analogously to example 1 with the only difference that:

- as a pigment using a mixture of amorphous silicon dioxide with calcium carbonate having a specific surface area of particles of less than 20 m ² / g in a ratio of 45:55;

- the amount of polyvinyl alcohol in the composition of the coating composition of 23%.

The resulting inkjet paper samples were printed on HP PHOTOSMART 8153 and Epson StylusPhoto 935 printers.

Inkjet paper obtained in accordance with Examples 1-7 was evaluated for surface strength, optical density for printing, and a tendency to print when printed.

Optical density over black Yellow optical density Magenta optical density Blue optical density Surface strength, m / s Spreading tendency when printing, paragraph. Example No. 1 2.40 1.10 0.98 0.70 2,5 0.2 Example No. 2 2.43 1,11 0.96 0.71 2,4 0.2 Example No. 3 2.47 1.10 0.98 0.71 2,5 0.2 Example No. 4 2.42 1.09 0.99 0.72 2.2 0.2 Example No. 5 2.45 1.12 0.97 0.71 2,3 0.2 Example No. 6 2.46 1,11 0.98 0.70 2.1 0.2 Example No. 6

The tendency to increase was estimated by the thickness (in points) of the smallest visible line when printing with yellow ink on a black background. From the data of the table it can be seen that the paper samples obtained by the described method have high surface strength and printing characteristics.

Claims (2)

1. A method of manufacturing paper for inkjet printing with a pigment coating, comprising obtaining a base paper, applying sequentially on one side of the coating, receiving ink, consisting of a pigment and a binder, and then a cationic fixative, and on the other side of the base paper - anti-rolling coating after which the coating is refined by supercalendering, characterized in that a mixture of amorphous silicon dioxide with kaolin or car is used as a pigment for a coating that accepts ink calcium bonate having a specific surface area of particles <20 m ² / g in the ratio (75 ÷ 45): (25 ÷ 55), and polyvinyl alcohol in the amount of 20-25% by weight of the pigment is used as a binder. 2. Paper for inkjet printing with a pigment coating, characterized in that it is made according to claim 1.