SU1359387A1 - Pulp for making corrugated paper - Google Patents

Abstract

The invention relates to the field of pulp and paper industry and improves the quality of paper by increasing the resistance to plane compression. Pulp for making corrugated paper is prepared as follows. Magnesium bisulfite coniferous cellulose with you. 60-62% in the amount of 30-50 wt.% is ground to a grinding degree of 19 SR and mixed with magnesium-ammonium bisulphite-alkaline leafy hemicellulose, ground to the grinding degree of 19 SR, in the amount of 50-70 wt.%. From the resulting pulp cast paper weighing 125 g / m. 1 tab. with $ (L 00 ate with co 00

Description

This invention relates to the pulp and paper industry and can be used in the manufacture of corrugated paper.

The purpose of the invention is to improve paper quality by increasing the flat crush resistance.

The essence of the invention is that the pulp for making corrugated paper, containing a bisulfite fibrous semi-finished product from coniferous wood on a magnesium base and a bisulphite-alkaline semi-cellulose from hardwood on a magnesium-ammonium basis, contains as a bisulphite fibrous semi-finished product from a hedge on a magnesium base bisulfite cellulose with a yield of 60-62% in the following ratio, wt.%:

Magnesium bisulfite

. softwood pulp

timber30-50

Magnesium ammonium bi-sulfite-alkaline hemicellulose. 50-70

Example 1 (according to the invention). Pulp for making corrugated paper is prepared as follows: magnesium-bisulfite: softwood pulp with a yield of 60%, ground to 19 SR is mixed with bi-sulfite-alkaline hardwood half-cellulose, ground to 19 ° SR, the following ratio of components,% by weight;

Magnesium bisulfite cellulose from coniferous wood with a yield of 60% 30 Magnesium ammonium bisulphite-alkaline hemicellulose with a yield of 74% 70 Paper 125 g / m is cast from the resulting pulp

Paper quality indicators are given in the table.

Example 2 (according to the invention). Pulp for making corrugated paper is prepared analogously to example 1 with the only difference that semi-finished products are crushed to 20.5 SR in the following ratio, wt.%: Magnesium bisulphite pulp from coniferous wood with a yield of 62% 50

Magnesium ammonium bisulfite-alkaline

semi-cellulose with a yield of 76% 50

From the resulting pulp cast paper weighing 125 g / m.

Paper quality indicators are given in the table.

Example 3 (according to the invention). Pulp for making corrugated paper is prepared analogously to example 1 in the following ratio of components, wt.% :. 5 Magnesium ammonium

bisulphite-alkaline hemicellulose with a yield of 74% 60 Magnesium bisulphite 0 cellulose. from coniferous

wood with a yield of 60% 40 From the resulting pulp, paper weighing 125 g / m is cast. Quality indicators are given in the table.

Example 4 (prototype). Pulp for making corrugated paper is prepared under production conditions as follows. Magnesium bisulfite coniferous hemicellulose with a yield of 69% is ground to. 20.5 SR and mixed with bisulphite-alkaline hardwood Semi-Cellulose, ground to 20.5 SR in 5 ratios, used on the Krasnoyarsk pulp and paper mill, wt.%:

Magnesium bisulfite conifer semi-cellulose 70 Magnesium ammonium bi-40 sulfite-alkaline

half-larchous leaf. vine 30

From the resulting pulp, paper is poured with a mass of 125 g / m. 45. Paper quality indicators are given in the table.

Example 5 (control). Pulp for the manufacture of corrugated paper is prepared similar to 50 MO of example 4 with the following ratio of components, wt.%: Magnesium bisulfite coniferous hemicellulose with a yield of 69% 50

55 Magnesium ammonium bisulfite-alkaline sheet- - venous hemicellulose 50

From the obtained fibrous mass, paper weighing 125 g / m is cast.

Paper quality indicators are given in the table.

Example 6 (control). Pulp for making corrugated paper is prepared analogously to example 1 with the only difference that magnesium bisulfite softwood pulp is used in a yield of 59%.

From the resulting pulp cast paper weighing 125 g / m. .

Paper quality indicators are given in the table.

Example 7 (control). Pulp for making corrugated paper is prepared analogously to example 2 with the only difference that softwood sulphite pulp is used with a yield of 63%.

From the resulting pulp cast paper weighing 125 g / m.

Quality indicators are given in the table.

Example 8 (control). Pulp for making corrugated paper is prepared analogously to example 1 with the only difference that the components are mixed in the following ratio, wt.%:

Magnesium bisulfite

softwood pulp

wood with a yield of 60% 28

Magnesium ammonium bisulfite-alkaline

hemicellulose with vydom 74% 72.

From the resulting pulp cast paper weighing 125 g / m.

The composition of the fiber,% Coniferous cellulose

Deciduous, semi-cellulose

MaVca 1 m2, g

Paper quality indicators are given in the table.

As shown by the results of tests of corrugated paper made from the proposed pulp (examples 1-3), the resistance to flat compression of such paper is much higher than that of prototype paper (example 4), which makes it possible to increase the share of hardwood semi-cellulose in the composition of the fibrous mass up to 50-70%.

one

Shape L and Shadow

Fibrous pulp for making corrugated paper, containing bisulfite fibrous semi-finished product from coniferous wood on a magnesium base and bisulfite-alkaline semi-cellulose from hardwood on a magnesium-ammonium basis, in order to improve the quality of paper by increasing the resistance to plane compression, it contains as a bisulfite fibrous semi-finished product from coniferous wood - on a magnesium base bisulfite cellulose with a yield of 60-62% with a very small ratio of onentov, wt.%:

Magnesium bisulfite cellulose from coniferous wood30- .50 Magnesium ammonium bisulphite-alkali semi-cellulose 50-70

40 70

50

30 50

28

60 30 - 50 125 125 125

70 50 72 125 125 125

The degree of grinding, SR

19 20.5 20.5 20.5 20.5 19 20.5 19

Burst resistance, kPa

Resistance to planar compression, N

370 350 340 280 290 290 325 330

290 270 280 210 230. 250 260 250

Claims (1)

Claim A pulp for making corrugated paper containing 2Q bisulphite fibrous semi-finished product from softwood on a magnesium base and bisulphite-alkali semi-cellulose from hardwood on a magnesium-ammonium base, 25 characterized in that, in order to improve the quality of the paper by increasing the resistance to plane compression, it contains bisulfite fibrous 3θ semi-finished product from coniferous wood on a magnesium base, bisulfite cellulose with a yield of 60-62% at a ratio of com onentov, wt.%: Magnesium bisulfite cellulose 35 „about coniferous wood lulose 30-50 Magnesium-ammonium bisulfite-alkaline. _n polutsellyuloza50-70 Examples of the invention Prototype Example 4 Test cases 1 2 3 . 5 6 7 8 The composition of the fiber,% Softwood pulp thirty fifty 40 70 fifty thirty fifty 28 Hardwood pulp 70 fifty 60 thirty' - fifty 70 fifty 72 Ma ^s ssa 1 m ² , g 125 125 125 125 125 125 125 125 Table continuation Examples of the invention —------- Prototype Example 4 Test cases 1 2 3 5 6 7 8 The degree of grinding, * ShR 19 20.5 20.5 20.5 20.5 ¹⁹ 20.5 19 Bursting Resistance, kPa 370 350 340 280 290 290 325 330 Resistance to plane compression, N a ’ 290 270 280 210 230 250 260 250