SU1409704A1 - Composition for making insole cardboard - Google Patents

Abstract

This invention relates to celu. paper industry and improves the quality of cardboard by reducing the scaling and increasing its mechanical strength. The stack cardboard composition contains the following components, wt%: 69-74 prehydrolysis sulphate pulp containing macromolecules with a maximum molecular weight (0.8-1.2) .10 -60-70 and with a minimum molecular weight (50 -80) -103-30-40; 16.0-19.5 chloroprene latex; 5.0-5.5 stabilizers 3.5-4.0 coagulant and 1.5-2.0 zinc oxide. The pulp is ground to the degree of grinding 24-26 SHR, glued with chloroprene latex, stabilized with a solution of sulfite-alcohol bards, coagulant and zinc oxide are added to the mass. The mass is fed to the table of a long-haul machine, where it is dehydrated to a moisture content of 65-75%, then pressed to a moisture content of 55-65%. After this, the web is dried, calendered and printed. 5 tab. to CL with

Description

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About WITH

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The invention relates to the pulp and paper industry, in I, in particular, to the production of stack I paperboard for interior parts of footwear.

The purpose of the invention is to improve the fairness of cardboard by reducing i scaling and increasing its mechanical strength. SUMMARY OF THE INVENTION The essence of the invention is that sulfate prehydrolysis cellulose containing macromolecules with a maximum molecular weight of 0.8-1.210 and a minimum molecular weight of 50-80-10 with a ratio of 60-70: 40- 30 ma.ch.

The manufacture of sidewall cardboard is carried out as follows.

The pulp is dissolved in the pulper, after which it is subjected to sequential grinding in two or three conical mills to the degree of grinding between 24 and 26 SR (the degree of grinding of the initial pulp is 12-14). The ground mass at a concentration of 1.3-1.5% is glued with stabilized latex. The latter is stabilized with a solution of sulfite-alcohol bards. The deposition and fixing of the latex on the cellulose fibers is produced by a solution of coagulant, for example, aluminum potash alum. The glued mass is fed to; the table of the long-grid machine (type KS-01), where it is dehydrated to a moisture content of 65-75%. Further removal of moisture is produced by pressing a web to a moisture content of 55-65%. Yes - follows the operation of drying the linen d; moisture 4-8% and finishing the cardboard ka: grounding and printing. The use of bleached prehydrolysis

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produced for the production of staleboard cardboard and the same proposed pulp.

Example 1. Cardboard is made from a composition in the following ratio of components, wt.%:

Belenium prehydrolysis sulphate cellulose containing macromolecules with a maximum molecular weight of 0.8-1.2-10 and a minimum molecular weight of 50-80 -10 in the ratio of 70:30

Synthetic chloropropene latex (LNT-1)

Stabilizer — a solution of sulphite alcohol bards Coagul bt — aluminum-alum alum Oxide of calcium Cellulose is dissolved in a hydraulic separator, and then pumped to conical mills. The grinding of cellulose is carried out in 2 degrees, as a result of which the degree of grinding of cellulose is increased from 15 to 25 ° SH. The ground mass at a concentration of 1.3-1.5% is glued with a latex, previously stabilized with a solution of sulfite-alcohol bards concentrate. To prevent aging of the finished cardboard, a dispersion of zinc oxide is introduced into the latex.

The glued mass is cast on a long-line machine, where it is dehydrated to a moisture content of 70%; After pressing the web in the press hour69, 0 19.5

5.5

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No sulphate cellulose containing cellulose, it is dried by contact on the drying cylinders of the machine to a moisture content of 4-8%, separated, calendered and printed.

in a certain ratio of wet-molecule with the maximum and minimum values of molecular weight, it allows to increase the strength properties of staleboard cardboard, sharply reduce the flaking of its surface, while maintaining other quality indicators of cardboard.

Table 1 shows the results of the determination (the average of 5 samples of molecular weight and ratios of fractions with different molecular weights in bleached prehydrolysis sulphate pulp, usually used mash, it is dried by contact

Soak on the drying cylinders of the machine to a moisture content of 4-8%, separate, calender and print.

Tables 2 and 3 show the quality indicators of the stack cardboard thus obtained, and for comparison, the quality indicators of the famous stack cardboard are presented.

From the data of Table 1 it follows that the proposed composition with the same bulk density provides for obtaining cardboard with higher strength properties than the known

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composition, and much less scale. At the same time, the hygienic indicators compared to the cartons are almost the same.

Example 2. Steleonic cartoons are made of a composition with the following ratio of components, May. Blene prehydrols sulphate cellulose,

containing macromolecules with a maximum molecular weight of 0.8-1.2-10 and a minimum

molecular weight of 50-80-10 in the ratio of 60: 4074.0

Synthetic

latex LNT-116,0

The stabilizer is a solution of the concentrate of I. sulfite-alcohol bards5.0 Coagulide-alumina alum 3.5 Zinc oxide 1.5 The process for the production of staleboard cardboard is similar to that described in example 1..

Table 3 shows the qualitative indicators of the resulting cardboard.

From the data of Table 3 it follows that the proposed paperboard is superior to the one known for its tensile strength, and also has a lower flake quality.

The hygienic properties of the compared cartons (r iggroscopicity, moisture return), as can be seen from Table 3 are almost the same.

Example 3. Strelechno carto made from the composition with the following ratio of components, wt.%:

Belenium prehydrolysis sulfate cellulose containing macromolecules

with maximum

the molecular weight of 0.8-1.2 -10 and the minimum molecular

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masses 50-80 .10 in the ratio 65: 3571.5. LH synthetic synthetic material {T-117.7. Stabilizer - concentrate solution

SULFITSPIRTOBOY

bards5,3

Coagul nt - potassium alum3,7

Zinc Oxide1.8

The manufacturing process of the stacked cardboard is similar to that described in Example 1.

Tables 4 and 5 show the quality indicators of manufactured cardboard.

From the data of Table 4 it follows that the proposed cardboard differs from the well-known one with higher strength properties with practically identical hygienic indices (hygroscopicity, moisture return, vapor permeability), has a significantly lower surface level.

Claims (1)

Invention Formula A composition for the manufacture of staleboard paper containing bleached prehydrolysis sulphate cellulose, chloroprene latex, coagulant, stabilizer and zinc oxide, which, in order to improve quality by reducing scaling and increasing its mechanical strength, as a prehydrol sulphate sulfate, in a pre-hydrolysis sulphate sulfate form. cellulose containing macromolecules with a maximum mol. May. (0.8-1.2) -60-70 wt.% and with a minimum value of mol. m. (50-80) .10 -30-40 wt.% in the following ratio, wt.%; Prehydrolysis sulphate cellulose 69.0-74.0 Chloroprene latex 16,0-19,5 Stabilizer 5.0-5.5 Coagul NT 3.5-4.0 Zinc Oxide 1,5-2,0 Known 50-80-10 0.8-1.2-10 80-85: 20-15 Proposed 50-80-U 0.8-1.2-10 60-70: 40-30 Molecular weight was determined by the method exclk zionic gas-liquid chromatography. The molecular weight distribution was determined by the method of turbidimetric titration from cellulose solutions in the cadmium-ethylenediamine complex. Table 2 Cardboard Cardboard quality indicators  The average of 20 batches. Famous Proposed 1.518.3 7.25 2.75 2.480,770.8583 1.6916.4 7.25 3.0 2.500.770.7914 Table Table 3 Famous Proposed 1.50 18.3.25 2.75 2.480.77 0.85 83 1.55 15.57.23 2.90 2.500.77 0.85. 21 Known 1.50 18.3 7.25 2.75 2.480.77 0.85 83 , Offer. my 1.62 16.0 7.25 2.90 2.700.77 0.84 Table 4 83 Table 5 nineteen