Fibrous composition for the manufacture of newsprint

 

(57) Abstract:

The use - manufacture of newsprint. The invention is a fibrous composition for the manufacture of newsprint contains, by weight. %: thermocapillary wood pulp with a beating degree of 75 - 80oSR 30 - 45 and chemi-thermomechanical mass with the degree of grinding 65 - 75oSR 55 - 70. table 1.

The invention relates to the pulp and paper industry and can be used for the production of newsprint.

Known fibrous composition for the production of newsprint containing composition 70-80% groundwood pulp with a beating degree of 70-74aboutSHR and 20-30% unbleached sulfite or sulfate softwood bleached or porublennoy pulp, ground up to 24-27aboutSR [1] the composition of the fiber of this composition is determined by the properties of the above fibers (groundwood pulp short fibers with good design surface, high opacity; cellulose long flexible fibers with high intrinsic strength) and the required properties of newsprint. Cellulose fibers play the role of the framework in the paper sheet, the space between the pulp fibers in the sheet zapolnjaete and opacity newsprint, while cellulose fibers provide the required mechanical strength of paper.

The disadvantage of this fibrous composition is poor development of more long fibers and the increased number of pieces of groundwood fibers in wood mass, which leads to an increase in the content of the cellulose fibers to 20-30% of these shortcomings are due to the fact that the production of ground wood split wood into fibers is mainly due to the cutting of the fibers, and not splitting at the median plate. The increase of the degree of grinding of ground wood leads to deterioration of quality due to the increased content pieces fibers in the mass.

To overcome these disadvantages of the different methods of obtaining wood pulp, based on the splitting of the fiber wood chips and pre-treatment of wood chips with steam and chemicals to soften the middle of the plate before splitting the wood pulp fibers. Fibrous semi-finished products, obtainable by these methods, called thermomechanical and chemi-thermomechanical pulp. Using data fibrous semi-finished products comprising fibrous composition for manufacturing the Oia for the manufacture of newsprint, containing 100% chemical-thermomechanical pulp [3] Fiber chemi-thermomechanical pulp in the above compositions are partially or completely replace the fiber pulp and groundwood pulp. The disadvantages of these compositions are less compared with the fibers groundwood pulp opacity and stiffness of the fibers, as well as smaller compared to cellulose fibers strength fibers chemi-thermomechanical pulp. To overcome these shortcomings fibrous composition for the production of newsprint must contain fibers with the hardness and opacity of the fibers, ground wood, but better designed compared to the last, and the long fiber for the formation of the skeleton of a sheet of paper.

Also known fibrous composition for the manufacture of newsprint, not containing cellulose and containing 50-85% ground wood and 15-50% of the product of sulfonation, obtained by impregnation of wood chips with sodium hydroxide, separating the chips into fiber by crushing wood chips between smooth surfaces, impregnating the resulting mass sodium sulfite and subsequent grinding to the degree of grinding of the 70aboutSR [4] NEWU mechanical strength, in particular in terms of "breaking length", and the process to obtain the product of sulfonation requires greater energy consumption and chemicals compared to conventional chemical-thermomechanical pulp.

The closest analogue of the present invention is a fibrous composition for the production of newsprint, containing 28% of chemi-thermomechanical pulp with a beating degree of 50-60aboutSR obtained by the method OPCO, 50% groundwood pulp with a beating degree of 70-74aboutSHR and 22% tmp [5] the Disadvantage of this composition is that it uses chemical thermo mechanical pulp OPCO and tmp can not completely replace the cellulose, resulting in the mechanical strength of the paper is not high enough.

New technical result from the use of the invention are more qualitative indicators of newsprint in the absence in the composition of the fibrous composition of the pulp.

Specified new technical result is achieved in that the fibrous composition for the manufacture of newsprint containing groundwood mechanical pulp and chemi-thermomechanical mass, according to the invention in quality is, and as thermomechanical pulp specified weight with the degree of grinding 65-75aboutSR in the following ratio of these components, wt. Thermocapillary wood pulp 30-45 Chemical-Turbomeca technical weight 55-70.

Offer fibrous composition for the production of newsprint contains fibrous semi-finished product obtained by pulping balances at a pressure above atmospheric and elevated temperature in the pulping area, mainly within 100-119aboutC. This intermediate product was named thermocapillary wood pulp. When the temperature of the lignin of the median plate is softened, and encourage the sharing of wood on Volova by splitting and not cutting. Get thermocapillary wood pulp free from the disadvantages of conventional groundwood pulp, while retaining its advantages. The frame is a sheet of paper in the production of newsprint from the proposed fibrous composition is created by fibers of chemi-thermomechanical pulp. Due to the different fractional composition of cellulose fibers and chemical-thermomechanical pulp fiber content chemicomechanical mass in the proposed fiber is the above-mentioned semi-finished products with the obligatory combination of higher degrees of grinding: for thermocapillary wood pulp 75-80aboutSHR, and for hikima-thermomechanical pulp 65-75aboutSHR. Due to the fact that the production thermocapillary wood pulp splitting wood into fibers is carried out on the median plate, increasing the degree of grinding in this case does not lead to deterioration of quality mass. Insufficient own strength fibers chemi-thermomechanical pulp compensated by additional hydrogen bonds established as a result of higher degree of grinding both used fibrous semi-finished products.

The invention is illustrated by the following examples of its implementation.

P R I m e R 1. Industrial paper machine for technological enterprise mode receive newsprint from a fibrous composition containing 35% thermocapillary wood pulp with a beating degree of 77aboutSHR obtained by pulping of spruce pulpwood at a pressure and temperature in the zone of the pulping 0,5 MPa and 108aboutWith, and 65% of chemi-thermomechanical pulp obtained by grinding the pre-impregnated with a solution of sodium sulfite with a flow rate of 20 kg of reagent/ton of wood chips and steamed at a temperature of 115-135aboutWith spruce chips, to the extent pimero 1 get newsprint from a fibrous composition, containing 45% thermocapillary wood pulp from spruce wood with a degree of grinding of the 75aboutSHR and 55% of chemi-thermomechanical pulp from spruce wood with the degree of grinding 65aboutSHR. Qualitative indicators of newsprint in the table.

P R I m e R 3. In example 1 get newsprint from a fibrous composition containing 30% thermocapillary wood pulp from spruce wood with the degree of grinding 80aboutSR and 70% of chemi-thermomechanical pulp from spruce wood with a degree of grinding of the 70aboutSHR. Qualitative indicators of newsprint in the table.

P R I m e R 4 (the prototype). In example 1 get newsprint from a fibrous composition containing 50% groundwood pulp from spruce wood with a degree of grinding of the 70aboutSHR, 22% thermomechanical pulp from spruce wood with a degree of grinding of the 60aboutSHR and 28% of the mass OPCO, milled to 55aboutSHR. Qualitative indicators of newsprint in the table.

P R I m e R 5 (control). In example 1 get newsprint from a fibrous composition containing 45% groundwood pulp from spruce wood with the degree of grinding 74aboutSR, 40% of chemi-thermomechanical pulp from spruce wood with the power of the 25aboutSHR. Qualitative indicators of newsprint in the table.

As can be seen from the table, the proposed fiber composition allows to obtain newsprint with higher mechanical strength compared to the fibrous composition of the prototype. In comparison with the control variant (example 5) of the proposed fiber composition does not contain cellulose, which allows to reduce the consumption of wood raw material for the production of newsprint in 6-10% and reduce emissions into the atmosphere of sulfur dioxide.

Fibrous composition for the manufacture of newsprint containing groundwood mechanical pulp and chemi-thermomechanical mass, characterized in that as ground wood it contains thermocapillary wood pulp with a beating degree of 75 to 80oSR in the following ratio of these components, wt.

Thermocapillary wood pulp 30 45

Chemical thermo mechanical pulp 55 70

 

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