SU1664938A1 - Pulp composition for making bagging paper - Google Patents

Abstract

The invention relates to the pulp and paper industry and allows the physical and mechanical properties of paper to be improved while reducing its cost. This is achieved due to the fact that paper pulp, containing a mixture of sulphate unbleached softwood and hardwood pulp, working scrap, rosin glue and coagulant, additionally contains household packaging pulp with a delignification degree of 50 - 100 units. Kapp, and as a mixture of cellulose - sulphate unbleached softwood and sulphate unbleached hardwood pulp of separate cooking with a delignification degree of a mixture of 30 - 80 units. Kappa. The mass contains a mixture of all types of cellulose, ground to the degree of grinding 25 - 40 ° SR. Paper pulp contains these components in the following ratio, wt%: cellulose sulphate unbleached coniferous 41.0 - 82.8, cellulose sulphate unbleached hardwood 5.0 - 20.0, cellulose for household and packaging purposes 10.0 - 30, 0, working scrap 1.0 - 5.0, rosin glue 0.2 - 0.5 and coagulant 1.0 - 3.5. 1 tab.

Description

The invention relates to the pulp and paper industry, in particular to the production of sack paper used in the manufacture of bags.

The aim of the invention is to increase the physico-mechanical properties of paper while reducing its cost.

The essence of the invention is that the paper pulp additionally contains cellulose for household and packaging purposes with a delignification degree of 50-100 Kappa units, and sulphate unbleached softwood and sulphate unbleached hardwood pulp as a mixture of pulp with a delignification degree of a mixture of 30-80 units . Kappa. The mass contains a mixture

all types of cellulose, ground to the degree of grinding 25-40 ° SHR. The composition of cellulose for household and packaging purposes includes the selection and waste sorting in the production of sulphate or sulphite bleached or unbleached pulp.

The used fibrous semi-finished products (cellulose for household and packaging purposes with a delignification degree of 50-100 Kappa units) have slightly lower mechanical strength indices compared to unbleached sulphate coniferous pulp, but being ground in combination with reusable marriage and a mixture of sulphate coniferous unbleached and Sulfate hardwood unbleached pulp with a degree of delignification of a mixture of 30-80 units. Kappa to the degree of grinding 25O

about

s

45 CO 00

40 ° SR, provides improved quality (physico-mechanical) indicators of paper while reducing the cost of paper.

The paper pulp is prepared in the following manner,

I get sulphate pulp) by separate boiling of coniferous and hardwood wood chips in drug boilers, followed by hot grinding and sorting to delignification after mixing 30-80 units. Kappa. Domestic packaging pulp with a delignification degree of 50-100 units. Kappa is obtained by sorting sulphate unbleached pulp with its subsequent grinding in a disk mill and then it is fed to the receiving basin of a boom machine. Reverse scrap from the mixer under the gauch-shaft is fed by a centrifugal pump to the receiving or engine pool. Rejects from the drying part of the overlap of the slitting machine enters the hydraulic scraper, common to several machines. Ground spoilage enters the machine or inlet basin of the paper machine. Further, all fibrous semi-finished products are subjected to joint grinding in disk mills at a concentration of 3-5% to the degree of grinding 25-40 ° SHR.

Rosin glue is given in the mass pipeline after the engine pool in the amount of 0.2-0.5%. Coagulite n-alumina, alum or sulfuric acid is fed into the pipeline in front of the mixing pump in an amount of 1.0–3.5%, the pH of the subgrid water is not lower than 4.0. Then the paper pulp is fed to a mixing pump for dilution with circulating water to a concentration of 0.13-0.50%, and then to the first stage of centrifuge cleaning. The sorted mass after the first stage of centricliners goes to the collector in the pressure box of the paper machine.

From the pressure box, the paper pulp enters the grid dewatering table. Then passes the press, drying part, refrigerator and peripheral roll. The finished paper is cut into rolls of the required sizes on a longitudinal-cutting machine. Paper bags are used to make paper bags of various sizes and types for products mainly for light and bulk loads.

PRI me R 1. Bag paper is made from paper pulp in the following ratio of components May%:

Sulfate is not white

conifer pulp82,8

Sulfinlch is not white

larch pulp5.0

Cellulose for household and packaging purposes (OST 13-140-82) 10.0

Revolving marriage1.0

White Rosin Glue 0.2 Coagul nt (Alumina) 1.0

A mixture of unbleached sulphate coniferous and hardwood pulp with a delignification degree of 80 units. Kappa and cellulose for household and packaging purposes with a delignification degree of 100 units. Kappa, as well as the dissolved reject marriage, are fed to disc mills, where these semi-finished products grind to 40 ° SR. White rosin glue is given in the mass line after the engine pool in the amount of 0.2%. Coagulum in the form of alumina is fed into the pipeline in front of the mixing pump in the amount of 1.0%. Next, the pulp is fed to a mixing pump to dilute the back water to a concentration of 0.50%, and then it goes for cleaning. The cleaned pulp is fed to the paper machine. From the pressure box, the paper pulp enters the grid dewatering table. Then passes the press, drying part, refrigerator and peripheral reel. The finished paper is cut into rolls of the required sizes on a longitudinal-cutting machine. Paper bags are made from paper on a pipe machine.

PRI mme R 2. Similarly to example 1, from paper pulp receive bag paper in the following ratio, wt.%:

Sulfate unbleached coniferous cellulose 65.0

Sulfate unbleached cellulose10.0

Household packaging pulp 20.0 Reverse scrap 2.5 Rosin glue 0.3 Coagul nt (alum) 2.2 A mixture of unbleached softwood softwood and hardwood pulp with a delignification degree of 60 units. Kappa and pulp of household packaging designation with a delignification degree of 75 units. Kappa comes from the brewing department, as well as a loose working marriage to disc mills for grinding to 30 ° SR. Further, as in example 1,

PRI me R 3. Analogously to example 1, from paper pulp receive bag paper in the following ratio of components, wt.%:

Sulfate unbleached coniferous cellulose 41.0

Sulfate unbleached cellulose 20,0

Household packaging pulp 30.0 Recyclable 5.0 White rosin glue 0.5 Coagulant (sulfuric acid) 3.5 A mixture of unbleached soft kraft and hardwood pulp with a delignification degree of 30 units Kappa and pulp of household packaging designation with a delignification degree of 50 units. Kappas come from the brewing department, as well as loose rejects, into disc mills for grinding to 25 ° SR. Further, as in example 1.

Qualitative indicators of the resulting paper are presented in the table.

These examples indicate that the use of household packaging in the paper composition of the pulp with a delignification degree of 50-100 Kappa units, as well as a mixture of sulphate unbleached softwood and hardwood pulp with a delignification degree of the mixture of 30-80 u. Kappa, when grinding all types of cellulose to 25-40 ° SR, allows to increase the physical and mechanical properties of the paper and at the same time to reduce its cost.

Made paper bags of the proposed composition have been tested by consumers when packaging various goods, such as postal correspondents, senna flour and soda. Positive results have been obtained from consumers.

Claims (1)

Claims for making sack paper containing a mixture of coniferous and hardwood sulphate pulp, recycling, rosin glue and coagulant, which, in order to improve the physical and mechanical properties of paper while reducing its cost, the mass additionally contains cellulose household packing assignment with a delignification level of 50-100 units. Kappa, and as a mixture of cellulose - sulphate unbleached softwood and sulphate unbleached hardwood pulp of separate cooking with a delignification degree of a mixture of 30-80 units. Kappa, while the mass contains a mixture of all types of cellulose, ground to a grinding degree of 25-40 ° SR, in the following ratio of components, wt.%: Sulfate non-white coniferous cellulose41,0-82.8 Sulfate unbleached cellulose 5,0-20,0 Cellulose for household and packaging purposes 10.0-30.0 Revolving marriage1.0-5.0 Rosin glue 0,2-0,5 Coagul nt1,0-3,5 Coniferous larch 97.8 (including 20 larch) 82.8 65.0 ten 41.0 20 0.2 2.0 50 1 2.5 0.2 0.2 1.0 2.2 80 TOT 60 75 thirty 5.0 0.5 3.5 Known thirty 78 / Offered Not less Not less than Not less than 44.0 4.0 850