The way this model making cardboard and writing or printing paper

 

(57) Abstract:

Usage: for making paper mass consumption, for example, upon receipt paper writing or printing paper for offset printing and gravure printing, and cardboard. The essence of the invention: method of aerodynamic manufacture of cardboard and writing or printing paper, including the preparation of water saturated aerospace, forming a layer on a grid table, pressing and drying, the molded layer is treated with water. When this processing is formed of a layer of water to carry more moisture in 2-18%. Preparation of water saturated aerospace is carried out at a temperature 15-75oC, and the molding layer is carried out at a speed 200-2800 m/min and humidity of aerospace 20-35 wt.%. 4 C.p. f-crystals, 4 PL.

The invention relates to the pulp and paper industry and can be used for making paper mass consumption, for example, upon receipt of the printing paper for offset and gravure printing, typographical, Wallpaper, packaging cardboard or fiberboard.

A known method of manufacture of cardboard, including the grinding of cellulose-containing raw material with the formation of aerospace, aerodynami produce cardboard box with a high degree of uniformity of consumer properties in the machine and transverse directions.

The target additives such as dyes, fillers, thermoplastic binder is introduced into the defibrator.

A known method of manufacturing paper containing mechanical grinding of dry cellulose-containing raw material, such as cellulose in the form of folders, separating the received petals folders on the fibers by means of an air stream with the formation of aerospace, aerodynamische forming layer on a grid table, moistening, pressing and drying. The result is a paper intended for household and sanitary purposes [2]

This method has some significant drawbacks: when receiving aerospace on the basis of dry fibers is their electrification; difficult to obtain paper homogeneous structure due to the sticking of the particles to each other. To reduce the process of electrification fibers reduce the feed rate of flow of aerospace on a grid table, which reduces the performance of the method. Another significant disadvantage of this method is the impossibility of making paper, suitable for printing, letters, newspaper or cardboard. This is due to the fact that for more aerospace use dry pulp, which, as you know, when drying loses its sposobnostey invention to the technical essence and the achieved result is the aerodynamic method of manufacturing cardboard and writing or printing paper, including the preparation of water saturated aerospace, forming a layer on a grid table, pressing and drying [3]

When this molding layer is carried out at a humidity of aerospace 30-40% and the pressing is carried out at a linear pressure in the zone of capture of 25-45 kg/cm (optimum 35 kg/cm) and temperature 65-180oC (optimum temperature 110oC).

This method allows the manufacture of cardboard and writing-paper or printing (offset or newspaper) paper with the required physical and mechanical properties. However, the resulting fibrous materials have poor quality surface.

New technical result from the use of the present invention is the ability to manufacture the desired product with a high speed while improving the surface quality cardboard and writing or printing paper.

Achieved a new technical result of the fact that the aerodynamic method of manufacturing cardboard and writing or printing paper, including the preparation of water saturated aerospace, forming a layer on a grid table, pressing and drying, the formed layer is treated with water.

With water saturated aerospace implement p the th arouses when the temperature 15-75oC, the molding layer is carried out at a humidity of aerospace 20-35 wt. and speed 200-2800 m/min, and the subsequent processing is formed of a layer of water to carry more moisture in 2-18%

As the cellulose-containing raw material using a dry pulp or dry cellulose-containing vegetable fibers.

For more aerospace use the air close to Lagomasino at a given temperature (15-75oC), and the pressing is carried out at a temperature of 110-200oC and a pressure of 50-400 kg/cm2.

The essence of the invention is that the necessity of moistening the original dry cellulose or cellulose-containing material, such as wood pulp, up to 45-50 wt. and maintain humidity during the whole process. This allows you to effectively recover previously lost during the drying of cellulose ability to form paper with high strength properties.

It is established that the recovered cellulose has the ability to form the paper should be kept during the whole process, including formation of aerospace cellulose-containing layer on a grid table and pressing poluchennaya 0,04-0,06 kg of water/kg of air at a temperature of 15-75oC. This is because at the specified vlagonasyschennyh air is not capable of significantly change the specified humidity cellulose fibers. It is very important to solve the problem, because by reducing the moisture content to 20 wt. and lower fibers of cellulose or its analogs lose again its only just restored the ability to form paper with sufficient strength properties.

Example 1. A method of manufacturing paper for letterpress is as follows: preparation of water saturated aerospace original fibrous semi-finished product (sheet bleached SFA pulp with a beating degree of the 36oSHR) is carried out by uniform wetting with water by means of nozzles to a moisture content of 45% Then oblojenny prefabricated crushed in the device for pre-grinding sheet of cellulose on the petals, an average size of 5 mm. Petals stream of air heated to 60oC, transferred into inertial dryer in which they air flow additionally grinded to 2-3 mm When the moisture content is reduced to 35 wt. The flow of air with a temperature of 60oC and the absolute moisture content of 0.04 kg water/kg air) cellulose is transferred into diseny in the air flow.

The resulting aerowaves moisture-saturated cellulosic fibers fed into the device, where there is a mixture of aerospace with dispersed fiber, processed in a separate mill 2% aqueous solution of starch and aluminum sulfate to a pH of 5.9. The aggregate aerowaves on Mesopotamia channel is fed to a forming mesh, moving at a speed of 500 m/min. Air passes through the mesh and formed on its surface a layer of 35% humidity. The moisture content of the air increases to 0.06 kg water/kg air. The formed layer before pressing on the hot cylinder (the temperature of the cylinder 150oC) process water, when this water is fed through the nozzle in the amount of 100 kg/hour. This treatment allows to increase the humidity of 5% of the Layer is pressed to a density of 900 kg/m3. The pressure on the first pressing shaft 100 kg/cm2. After drying, the resulting material is subjected to a finish on the calender under pressure h,07 kPa.

The result is a paper weight 60 g/m2designed for printing text and illustrative-text articles. The test results obtained in the paper are given in table. 1.

Example 2. A method of manufacturing a printed paper exercise and the Oia 280 kg/cm2;

the temperature of the pressing 170oC;

the temperature in aerospace 75oC.

humidity aerospace 27 wt. humidity layer after water treatment has increased by 13% of the test Results obtained in the paper are given in table. 1.

Example 3. A method of manufacturing newsprint is as follows: dry unbleached coniferous sulphate pulp with a degree of delignification 50 Kappa mixed with dry unbleached hardwood pulp same degree of delignification in the ratio 2:1 respectively. The degree of grinding this mixture is 19oSHR. In the above composition add chemical-thermo-mechanical wood pulp (CTMP) and the mixture is moistened. After moistening get the water saturated aerowaves containing, in wt. 10 unbleached coniferous bisulfate pulp, unbleached 5 deciduous bisulfite pulp and 85 wood pulp. From water saturated aerospace formed on a grid table with a speed of 2200 m/min fibrous layer, the humidity of which is 22 wt. Before pressing the formed layer is treated with water through the nozzle. This treatment increases the humidity of 18% compressing the hydrated layer is carried out at 50 kg/cm2

Example 4. A method of manufacturing paper for gravure printing, with a weight of 100 g/m2, is as follows: original sheet cellulose hydrate with water to 50 wt. containing polyacrylamide in an amount of 0.1 wt. from the mass of absolutely dry fiber. Then hydrated cellulose is shredded and then get aerospace at a temperature of 40oC. Fibrous aerowaves mixed with aerowaves kaolin-treated rosin glue quantity wt. 0.5 and coagulant (alumina) 3. Then formed into a layer with a moisture content of fibers 30 wt. Molded layer before pressing process water through the nozzle and the humidity is increased by 10% pressed at 170oC. the feed Rate of the layer on the pressing is 2500 m/min the test Results obtained paper intended for informational-text publications are listed in the table. 2.

Example 5. A method of manufacturing paper for gravure printing carried out analogously to example 3 with the only difference that

the speed of the molding layer 2800 m/min

the pressure of 400 kg/cm2< / BR>
the temperature of the pressing 200oC

humidity aerospace 23 wt.

hydration before pressing increases the humidity in 17 service writing paper is as follows: sheet sulfite pulp with a beating degree of the 35oSHR moisturize with water to 40 wt. and grind with the formation of water saturated aerospace. In the prepared aeratus cellulose enter aerowaves alumina, taken in an amount of 7 wt. the weight of the absolutely dry fiber reinforced adhesive in the amount of 1.6 wt. and of silica gel in the amount of 8.1 wt. the weight of the absolutely dry fiber. Total aerowaves with moisture content of 25 wt. and the temperature of the 35oC serves on the grid table, the speed of which 700 m/min. Molded layer before pressing process water through the nozzle. The temperature of the pressing of the fibrous layer is 110oC, pressure of 50-75 kg/cm2. After drying at 200oC get the paper.

The test results obtained in the paper are given in table. 3.

Example 7. A method of manufacturing paper writing carried out analogously to example 5, with the only difference that the speed of the wind forming a layer of 200 m/min.

The test results of the paper are given in table 3.

Example 8. A method of manufacturing containerboard is as follows: sulphate pulp, crushed up 30oSHR, moistened to 50% moisture and ground in a disk mill, which serves folder thermomechanical the Yong cellulose and 8 wood pulp. The petals of the mixture the size of 5-7 mm air flow with a temperature of 75oC of the disc mill is served in the inertial dryer where their moisture content is reduced to 40 wt. The mixture of fibers comes in a dispersant in which a stream of air at the 75oC is the final separation of the fibers and the formation of aerospace. The moisture content of the fibers in aerospace is 38 wt. the moisture content of the air in aerospace 0.065 kg water per 1 kg of gas. On Mesopotamia channel aerospace comes to forming a grid, the velocity of which is 2500 m/min Formed layer after moisture (humidity increases by 2%) is fed to the hot cylinder, whose temperature is 170oC.

After pressing at a temperature of 200oC and a pressure of 50 kg/cm2get the cardboard sheets, the weight of which after drying is 127 g/m2.

The test results of cardboard, received this model as described in table. 4.

Example 9. A method of manufacturing insulating cardboard as follows: sulphate pulp with an average degree of grinding 45oSHR is moistened to 40 wt. and grind with the formation of water saturated aerospace, soderello and forth through the disperser and Mesopotamia channel molding. Speed aerodynamic forming layer 1200 m/min, the Temperature of the air in aerospace 25oC. the moisture content of the fibers in the molded layer 34% Molded layer before pressing process water through the nozzle to increase the moisture content of 6% After pressing moist layer at a temperature of 160oC and a pressure of 50 kg/cm2followed by drying receive the cardboard with the mass of an elementary layer 39 g/m2.

The test results of cardboard are given in table 5.

From the above examples 1-9 can be seen that the developed method allows to obtain the aerodynamic method the paper mass consumption, for example, paper for writing, printing, newspaper, and cardboard at high speed machines.

The obtained product by its physical-mechanical properties are not inferior to products made by traditional method from aqueous suspensions, but have improved the quality of the surface (such as surface resistance to plucking, the optical density of the print, smoothness and gloss) in comparison with similar products obtained by the method prototype.

The proposed method provides a significant economic effect due to the absence of ZAT the machines.

1. The way this model making cardboard and writing or printing paper, including the preparation of water saturated aerospace of the cellulose-containing raw material, a molding layer on a grid table, pressing and drying, characterized in that before pressing the molded layer is treated with water.

2. The method according to p. 1, characterized in that the processing of the molded layer water exercise to increase its humidity 2 18%

3. The method according to p. 1, characterized in that the molding layer is carried out at a humidity of aerospace 20 35%

4. The method according to p. 1, characterized in that the preparation of water saturated aerospace carried out at 15 75oC.

5. The method according to p. 1, characterized in that the molding layer is carried out at a speed of 200 2800 m/min

 

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