Method of manufacturing jet-printing paper with pigmented coating and jet-printing paper with pigmented coating

FIELD: paper-and-pulp industry.

SUBSTANCE: when ground paper is manufactured, it is coated with ink-accepting coating. The latter contains latex binder, water-soluble binder, pigment mixture of amorphous silica with colloidal cationic silica and colloidal alumina, and ink-fixing agent. Coating operation is performed in two steps, weight ratio of coating applied in the first step to that in the second step ranging from 0.34:1 to 0.66:1. Reverse face of base paper is coated by detwisting coating. Further, coating is ennobled via superglazing at pressure in supercalender roll gap 30-75 bar.

EFFECT: improved workability of process and improved quality of paper due to increased surface strength.

4 cl, 7 ex

 

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

It is known that the most stringent requirements for paper for inkjet printing because the printing is carried out with wet paint, and paper to ensure high print quality and fast drying, that is to possess properties that are difficult to achieve simultaneously.

A significant amount of paper intended for inkjet printing, is covered with a special coating of different composition to achieve certain characteristics of inkjet printers, many of which depend on the type and processing of paper.

Obtaining full-color images by the method of inkjet printing with full shading leaf area requires the following properties: the ability of the solid fraction of the dye ink on the surface of the material and rapid absorption of the liquid phase of the ink in the coating material without deformation. Such requirements due to the fact that inkjet ink is used or based on aqueous solutions of dyes, or on the basis of the dispersions of the dyes in a suitable liquid.

The lack of fixation of the dye ink on the surface of the coating leads to a decrease in optical density of the image is, and insufficient absorption of the liquid phase of the ink material of the coating leads to such defects as mixing colors, ocenie when printing lines and small details that make the image mashed and fuzzy.

Known method of preparing paper for inkjet printing with pigmented coating, comprising applying to the paper-based pigmented coatings containing pigment, synthetic resin of the cationic type and silicon-modified polyvinyl alcohol, the subsequent application of a water solution of a cationic resin, drying the obtained paper and calendering (see JP 3155267 B2, 41 M 5/00, 09.04.2001).

As a pigment, a mixture of silicon oxide with a specific surface area of 365 g/m2and aluminum oxide with the same specific surface area at a ratio of 1:3.

The paper obtained in a known manner, has a high surface hardness and good fiksiruetsya water paints.

A known method of manufacturing paper for inkjet printing with pigmented coating, comprising applying to the paper-based pigmented coatings containing absorbent pigment from silicon dioxide, a binder of polyvinyl alcohol and cationic fixative (EP 1090776 A1, B 41 M 5/00,11.04.2001).

When this pigment preferably consists of a mixture of 75% or more of silica gel with pore volume (0.5 to 1.5)m3 /kg and 10% or more of aluminum oxide or hydrate of aluminum oxide.

The paper obtained in a known manner, also has good fiksiruetsya water paints.

The closest analogue on the technological nature of the claimed technical solution is a method of manufacturing paper for inkjet printing with pigmented coating, including the production of base paper, the application of a coating, ink receptive, containing a latex binder, a water-soluble binder, a pigment based on amorphous silicon dioxide and the agent for fixing the ink, the subsequent application of protivoukachiwauschee coating on the opposite side of the base paper and the finishing coating, ink receptive (US 6410123 B1, B 41 M 5/00, 25.06.2002).

While finishing coatings, ink receptive, performed by sequential application of 2 layers of colloidal silicon dioxide. At least one of the layers of colloidal silicon dioxide in contact with the receiving paint coating, does not contain a binder and has a covering power of 0,001-0,003 kg/m2while the other layer has a covering power of 0,001-0,006 kg/m2.

The inkjet paper obtained in a known manner, has a high ink absorbency and citaprolamin properties.

However, three-stage application of p the closure, perceiving ink, with intermediate finish - very time consuming, malotekhnologichnykh process.

New technical result from the use of technical solutions is to increase the technological process by reducing the number of stages in the coating, ink receptive, while maintaining high ink absorbency and citaprolamin properties and improved durability of the surface.

This new technical result is achieved in that in the method of manufacturing paper for inkjet printing with pigmented coating, including the production of base paper, the application of a coating, ink receptive, containing a latex binder, a water-soluble binder, a pigment based on amorphous silicon dioxide and the agent for fixing the ink, the subsequent application of protivoukachiwauschee coating on the opposite side of the base paper and the finishing coating, ink receptive, as a pigment based on amorphous silicon dioxide, a mixture of the latter with colloidal cationic silica and colloidal alumina at massin the ratio of these components of the pigment, respectively (80-85):(10-15):(5-10), coating, ink receptive, to be implemented in two stages when the ratio of the mass of coating applied to the WTO the second stage from 0.43:1 to 0.66:1, and the finishing coating, ink receptive, carried by supercalendering when the pressure in the gripper shafts supercalender 30-75 bar.

The latex binder used water dispersion of an amphoteric or cationic styrene-acrylic copolymers, as well as colloidal aluminum oxide use the named product with the specific external surface of the particles 150-300 m2/year

Composite coating composition, perceiving the paint may include the necessary additives, such as semi-permanent dye, optical Brightener, a hardener, etc.

In the proposed method, amorphous and colloidal silicon dioxide are used as components of individual parts of the cover, taking in the paint, and together. Such mixtures of pigments allows to obtain coverage, combining the property of high absorbency with good affinity to the dye ink.

The introduction of aluminum oxide with the desired characteristics can further increase the fixation of the dye ink without compromising the absorption properties of the coating. The optimum content of aluminum oxide in the range from 5 to 10% of the total mass of the pigment.

The introduction of aluminum oxide also allows you to increase resistance, susceptible to mechanical stress (figure about the particular surface to picking 0.2-0.35 m/s). Thus the resultant mixture of pigments has the following composition: amorphous silica: colloidal silicon dioxide: colloidal alumina 80-85:10-15:5-10.

Floor, taking in the paint is applied in two steps sequentially. The total mass of the coating 9-15 g/m2. The proportion of the first layer is 30-40% by weight of the finished coating, and the share of the second - 60-70%. This ratio between the first and second layers is optimal from the viewpoint of obtaining uniform absorption properties of the coating, solid surface and subsequent quality finish.

The finishing coating, ink receptive, carried out by the final finishing of paper at supercalender when the pressure in the gap of the calender rolls 30-75 bar. The specified pressure range is optimal, increasing the pressure in the calendering leads to deterioration of the printing paper properties due to the reduced porosity of the coating.

Another object of the present invention relates to inkjet paper with pigmented coating produced by the proposed method and characterized by high surface hardness from 2.1 to 2.5 m/s

The proposed method of manufacturing the inkjet papers presents the following examples 1-8.

Example 1. A method of manufacturing paper for inkjet printers perform SL is blowing.

1. Base paper with a weight of 100 g/m2get wet on the paper machine, using the following composition in wt.%:

Bleached sulphate hardwood pulp45-63
Bleached coniferous sulphate pulp37-45
Calcium carbonate10 (portage, comp.)
Glue AAA0.3 to 0.5 (from fiber. comp.)
Cationic starch0,6-1,0 (from fiber. comp.)
Politicalintelligence
resin1.0 to 1.5 (from drawing dies, comp.)
Optical bleachof 0.1 to 0.13 (from drawing dies, comp.)
Dye10-12 g/t from cellulose

2. Preparing a composition with a concentration of 16% to cover, taking in the paint of the following composition (wt.% on the dry substance by weight of pigment):

Pigment100
Polyvinyl alcohol : 30
Dispersion of amphoteric styrene-acrylic
copolymer (Raiprint)25
Polydiallyldimethyl chloride (Catiofast) 7
Purple direct dye0,01
Optical bleach5
The product on the basis of polyhydroxyether resins3

The mixture is applied by an air knife for two doses.

As a pigment, a mixture of the following composition (wt.%): synthetic amorphous silicon dioxide - 85% (trade name GASIL); colloidal silicon dioxide cationic nature - 10 (trade name SYLOJET); colloidal alumina - 5% (trade name MARTOXIN).

The weight of the finished coating, ink receptive, 915 g/m2. The proportion of the first layer is 30-40% by weight of the finished coating, and the share of the second 60-70%. The drying is carried out using infrared emitters and by blowing hot air (temperature of 90-130°).

3. After coating, ink receptive, on the reverse side of the paper put protivoukachiwauschee coating having the following composition (wt.% dry by weight of pigment):

Pigment100
Latex strollerderby11
Polyvinyl alcohol : 2,5
Caustic soda0,14
Tributyl phosphate 0,4
Sodium pyrophosphate0,45

Protivoukachiwauschee coating applied on the coating machine equipped causing nodes with an air scraper. The weight of the finished coating 12-17 g/m2. The drying is carried out by blowing hot air (temperature 130°).

After the application of all coatings spend the finishing coating, ink receptive, in order to give him the necessary smoothness and appearance. The elevation is to finish the paper on supercalender when the pressure in the nip calender rolls 30 bar.

The obtained sample paper for inkjet printing sealed printers HP DJ 6122 and Epson Stylus Photo 950. The sample showed a good image quality and high resistance to mechanical damage.

Example 2.

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

as the cationic binder in the composition for coating, ink receptive, use the cationic dispersion of styrene-acrylic copolymer (trade name Baysize) in the amount of 20%;

- the elevation is carried out at a pressure of 40 bar.

The obtained sample paper for inkjet printing sealed on the HP devices 2I 6122 and Epson Stylus Photo 950. The sample obtained good quality image is agenia and high resistance to mechanical damage.

Example 3.

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

as the pigment in the composition for coating, perceiving the paint, use a mixture of the following composition: synthetic amorphous silicon dioxide - 80% (trade name GASIL); colloidal silicon dioxide cationic nature - 15% (trade name SYLOJET); colloidal alumina - 5% (trade name MARTOXIN);

- the elevation is carried out at a pressure of 55 bar.

The obtained sample paper for inkjet printing sealed printers HPDI 6122 and Epson Stylus Photo 950.

The sample obtained a good image quality and high resistance to mechanical damage.

Example 4.

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

as the pigment in the composition for coating, perceiving the paint, use a mixture of the following composition: synthetic amorphous silicon dioxide - 80% (trade name GASIL); colloidal silicon dioxide cationic nature - 15% (trade name SYLOJET); colloidal alumina - 5% (trade name MARTOXIN);

- as a binder in the composition for coating, perceiving the paint, use a dispersion of cationic Tiroler the gross copolymer (trade name Baysize) in the amount of 20%;

- the elevation is carried out at a pressure of 65 bar.

The obtained sample paper for inkjet printing sealed printers HP DJ 6122 and Epson Stylus Photo 950.

The sample obtained a good image quality and high resistance to mechanical damage.

Example 5.

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

as the pigment in the composition for coating, perceiving the paint, use a mixture of the following composition: synthetic amorphous silicon dioxide - 80% (trade name GASIL); colloidal silicon dioxide cationic nature - 10% (trade name SYLOJET); colloidal aluminum oxide - 10% (trade name MARTOXIN);

- as a binder in the composition for coating, perceiving the paint, use a cationic dispersion of styrene-acrylic copolymer (trade name Baysize) in the amount of 20%;

- the elevation is carried out at a pressure of 75 bar.

The obtained sample paper for inkjet printing sealed for HP printers DI 6122 and Epson Stylus Photo 950.

The sample obtained a good image quality and high resistance to mechanical damage.

Example 6.

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

- as the e pigment composition for coating, perceiving the ink, use a mixture of the following composition: synthetic amorphous silicon dioxide - 80% (trade name GASIL); colloidal silicon dioxide cationic nature - 10% (trade name SYLOJET); colloidal aluminum oxide - 10% (trade name MARTOXIN). The obtained sample paper for ink-jet recording sealed printers HPDJ 6122 and Epson Stylus Photo 950.

The sample obtained a good image quality and high resistance to mechanical damage.

Example 7.

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

- as a binder in the composition for coating, ink receptive, use the cationic dispersion of styrene-acrylic copolymer (trade name Baysize);

- as an agent to improve flexile ink composition for coating, ink receptive, use cationic polyallylamine (trade name Cartafix) in the amount of 8%;

- the elevation is carried out at a pressure of 65 bar.

The obtained sample paper for ink-jet recording sealed printers HPDJ 6122 and Epson Stylus Photo 950.

The sample obtained a good image quality and high resistance to mechanical damage.

The inkjet paper obtained in examples 1-7 and described in the high durability of the surface from 2.1 to 2.5 m/s, that is significantly higher than that of the paper obtained by the method prototype.

The proposed method of making paper for inkjet printing is characterized by increased manufacturability of the process by eliminating chemical finishing coatings, ink receptive, as in the method prototype, while maintaining high ink absorbency and citaprolamin properties and improved durability of the surface.

1. A method of manufacturing paper for inkjet printing with pigmented coating, including the production of base paper, the application of a coating, ink receptive, containing a latex binder, a water-soluble binder, a pigment based on amorphous silicon dioxide and the agent for fixing the ink, the subsequent application of protivoukachiwauschee coating on the opposite side of the base paper and the finishing coating, ink receptive, characterized in that the quality of a pigment based on amorphous silicon dioxide, a mixture of the latter with colloidal cationic silica and colloidal alumina at massin the ratio of these components of the pigment, respectively 80-85:10-15:5-10, and the application of coating, ink receptive, is carried out in two stages when the ratio of the mass of coating applied to the first stage, the mass of the coatings applied in the second stage, from 0.43:1 to 0.66:1 and the finishing coating, ink receptive, carried by supercalendering when the pressure in the gripper shafts supercalender 30-75 bar.

2. The method according to claim 1, characterized in that the latex binder used water dispersion of an amphoteric or cationic styrene-acrylic copolymers.

3. The method according to claim 1, characterized in that the colloidal aluminum oxide use the named product with the specific external surface of the particles 150-300 m2/year

4. Paper for inkjet printing with pigmented coating, characterized in that it is manufactured by the method according to claim 1.



 

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