A method of manufacturing a cellulose-containing materials

 

(57) Abstract:

The method relates to the pulp and paper industry and can be used in the manufacture of paper and cardboard. A method of manufacturing a cellulose-containing materials includes composing the fibrous mass with the use of chemical additives, the formation, his pressing and drying. As chemical additives used lignosulfonates. After filing into the fibre mass lignosulfonate optionally enter the precipitator, which is used as the polyoxychloride. The method allows to obtain pulp and paper products of high quality. table 1.

The invention relates to the pulp and paper industry and can be used in the manufacture of paper and cardboard.

Closest to the claimed is a method of manufacturing a cellulose-containing materials, including composing the fibrous mass with the use of chemical additives, the formation, his pressing and drying, as well as chemical additives used lignosulfonates (see RF patent №2019615, class D 21 H 11/106 1994).

A disadvantage of the known solutions is the lack of quality of pokey the following: the emergence of opportunities for efficient use of lignosulfonate in the pulp and paper industry, increasing the strength of the cellulose-containing material and increase its hydrophobicity; increased retention of fine fiber and filler in the canvas cellulosebased material in molding and, therefore, better quality and more efficient operation of the equipment.

The solution of this problem is provided by the fact that in the method of manufacturing a cellulose-containing material, including composing the fibrous mass with the use of chemical additives, the formation, his pressing and drying, as chemical additives used lignosulfonates, and after submission to the fibrous mass lignosulfonate optionally enter the precipitator, which is used as the polyoxychloride.

The technical essence of the invention consists in the following.

The lignosulfonate - crosslinked high-molecular compounds, soluble in water and dissociate with the formation of anionic macromolecules character. After their submission to the fibrous mass and sufficient mixing there is polyoxychloride dissociate in water and having the properties of cationic polyelectrolyte. Lignosulfonates come with polyoximethylene (Polyoxymethylene aluminum), macromolecules which have a pronounced positive charge and can effectively be deposited and secured to the negatively charged cellulosic fiber. The molded pulp material Polyoxymethylene aluminum promotes better sweathearting between pulp fibers, retention of fine fiber and filler in the canvas of a cellulose-containing material, the increase in strength and hydrophobic properties of the material. Education polyoxyphenylene aluminum can be represented by the pattern

The invention is illustrated by the following example.

Made offset paper No. 1 ash content of 22% with the following composition fiber: cellulose sulphate bleached coniferous 50%, the degree of grinding 30 SR; cellulose sulfate bleached hardwood 50%, the degree of grinding SHR 32. Manufacturer of offset paper No. 1 on laboratory listonline apparatus includes the following steps:

1. The dissolution of the fibrous material (cellulose) in water to form a water-fiber suspension.

2. Introduction to water-fiber suspension of mineral filler (chalk).

3. Introduction to water-fiber suspension chemical additives in the following sequence and followed by the g/t (the proposed method); aluminum sulfate 20 kg/t (nearest equivalent).

4. Adjustment of the pH of the aqueous fibrous suspension by the addition of sulfuric acid or sodium hydroxide to the desired values (7,0 - the proposed method; 5,0 - the nearest equivalent).

5. The forming of the paper web, which consists in filtering the water-fiber suspension through a grid ostatniego apparatus with education on the net wet paper web.

6. Pressing the paper web, which consists in mechanical wringing the water out using a special cushion.

7. Drying the paper web at a temperature of about S within 7 minutes.

In this way receive offset paper No. 1, comparison of quality indicators with the same kind of paper received by the nearest analogue in the table. Consumption of lignosulfonate in the proposed method and its nearest analogue is the same and is 10 kg/so

The amount of lignosulfonate and precipitator is determined depending on the kind of paper and cardboard quality water production and other technological factors and can be (in terms of dry matter):

- lignosulfonate - 2...15 kg/t;

- polyoxychloride - 2...40 kg/so

A method of manufacturing a cellulose-containing materials, including composing the fibrous mass with the use of chemical additives, the formation, his pressing and drying, as well as chemical additives used lignosulfonates, characterized in that after submitting to the fiber lignosulfonate optionally enter the precipitator, which is used as the polyoxychloride.

 

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