SU870550A1 - Fibrous mass for making printing paper - Google Patents

Description

(54) FIBER MASS FOR PRODUCTION OF PRINTING

one

The invention relates to cell paper MO-paper software. . v

The known pulp for the production of printing paper, containing bleached sulfite softwood pulp and bleached sulfite hardwood pulp, the content of the latter can reach 60% 11.

Belen sulfite coniferous cellulose, used in the known fiber mass, has a high cost and has a low sizing ability, which leads to an increase in the consumption of sizing agents and watering of the cost of printing paper.

The purpose of the invention is to send a degree of sizing paper while reducing its cost.

This is achieved by the fact that the proposed mass as sulfite coniferous cellulose contains a modified cellulose with a content of 0.16% sorbed hemicellulose with a polymerization degree of 80-123 with the following ratio of components, wt.%: Modified bleached coniferous sulfite coniferous cellulose 40 -99, bleached sulphate hardwood pulp 1-60. thirty

PAPERS

For the manufacture of printing paper, a sizing, a precipitant, a filler, and a filler retention agent are added to the pulp.

Modified cellulose can be obtained by treating sulfite pulp with monosulfite liquor. At the same time cellulose fibers sor-. hemicelluloses dissolved in liquor are used; KOTOisae have a degree of polymerization of 80-123. The amount of hemicellulose sorbed, depending on the processing conditions, is from 0.1 to 6% absolutely dry cellulose.

The effect of sorbed hemicellulose is manifested in the fact that they, located mainly on the outer surface of the cellulose and having a high degree of polymerization, form stronger bonds between the fibers. Therefore, the use of modified bleached sulphite pulp in a composition with bleached sulphate hardwood pulp improves sizing with high mechanical strength of printing paper.

Improving paper sizing will reduce the consumption of sizing substances and reduce its cost. The cost of printing paper is also omnified by the use of modified cellulose, which is cheaper than conventional, bleached sulphite pulp, by RUB. A further reduction in the cost of paper will occur at the expense of reducing the energy costs of grinding the modified sulphite pulp.

Example. The modified henbane sulfite coniferous cellulose has the following indicators: whiteness 87.5%, total content of pentosans, of which sorbed 1.0%, grinding time up to 12 minutes, breaking length 6617 m, fracture resistance 1519 double kinks.

A typical henbane sulfite coniferous cellulose has the following indicators; whiteness 87.7%, pentosan content 4.5%, grinding time up to 32 ° ShR 14 kshn, breaking length 5600 m, resistance-bending 1110 double kinks.

The bleached sulfate hardwood pulp, ground to, has a breaking length of 4800 m and a fracture resistance of 58 double kinks.

Under Laboratory Conditions, on a sheet casting machine of the TsBTP RapidKeten type, paper is made from pulp containing differently modified sulphite pulp and in different ratios (see Table 1). bleached sulphate hardwood pulp. Consumption of rosin-paraffin glue 3% by weight of paper, alumina - 6%, kaolin -.40%. For comparison, paper of known pulp is made under the same conditions.

The paper samples obtained were tested using standard methods. As can be seen from the data of Table 1, the degree of sizing of printing paper made from the proposed fibrous mass is 0.25 mm at a higher mechanical index.

In tab. Table 2 presents data on the effect of the consumption of rosin-paraffin glue on the degree of sizing of papers made from the proposed and known fibrous masses containing 15% of bleached sulfate hardwood pulp. The degree of sizing 1.25 mm when using the proposed fibrous mass was achieved at 2% consumption of glue, and for a known mass - only at 3% consumption.

Table 1

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8705506 J.1. „„ „.., Degree of paper sizing, mm j - .. рL: -

Claims (1)

Modified | Conventional sulI sulphite cellululophitic celluli for 85%, sulphate for 85%, sulphate 1 foliar cello – on foliar Thus, the proposed fibrous mass makes it possible to produce printed paper with a higher degree of sizing and less: cost price. 20 Invention formula. The fibrous mass for the production of printing paper containing bleached sulphite softwood pulp and sulphate hardwood pulp, characterized in that, in order to increase the sizing of the paper while reducing it Continued. 2, for 15%, cellulose 15% 15, sbestrim, mass tf the quality of sulphite softwood pulp contains a mixed ceria with content. 0.1–6% of sorbing hemicelle, degree of polymerization, and 8012 3 with the following composition of components, wt.%: Modification of the henbane sulphite needles cepulose 40-99, henbane sulphate pulpaceous cellulose 1-60 .. Sources of information taken into account eksp; about X | 13v: 1. Apsit S.O. et al. Papermaking properties of fibrous uvabrykat. M., 1972. p. 44.