Pulp for manufacturing packaging material

FIELD: paper-and-pulp industry.

SUBSTANCE: pulp for manufacturing mainly box-destination cardboard contains sulfite cellulose, wood-pulp, and secondary fiber. Sulfite cellulose is, more particularly, bisulfite cellulose bleached to 84-86% and having rigidity 30-35 Kappa units, tear resistance 430-460 mN, and punching resistance 430-460 mN. Such bisulfite cellulose is obtained by pulping mixture of softwood and foliferous wood at pH of cooking liquor 1.6-2.3, SO2 concentration 6.0-6.5%, and temperature 145-152°C. Wood-pulp is the one subjected to chemical, thermal, and mechanical treatment and characterized by whiteness 72-75%. Secondary fiber is ground paper waste with specified degree of grinding, optionally in the form of blend of differently ground marks.

EFFECT: improved strength characteristics and reduced manufacturing expenses.

4 cl, 1 tbl, 4 ex

 

The invention relates to the pulp and paper industry, in particular the production of packaging material, mainly to the production of box cardboard.

Known fibrous material for the manufacture of cardboard, used as a smooth layer of corrugated paperboard, containing sulphite pulp from a mixture of larch wood and hardwood sulfate and spruce pulp (see SU 874824, D 21 H 5/00, 23.01.1981).

However, the known fibrous mass does not provide sufficient strength cardboard box.

Known composition for the manufacture of cardboard, including sulphate pulp, paper and shredded synthetic knitted waste (see SU 1687690 A1, D 21 H 27/10, 30.10.1991).

Known composition are expected to be used in the manufacture of corrugated containerboard and box cardboard with high efficiency by using waste jerseys.

However, the known composition allows you to get a cardboard box with the required level of strength.

The closest analogue of the claimed invention to the technical essence is a fibrous material for the manufacture of the packaging material containing sulfite cellulose speed cooking, wood pulp and scop in the following ratio of components:

sulfite cellulose

speed cooking 25,0-55,0

p> wood pulp 20,0-30,0

waste from 15.0-20.0

scop 0,5-3,0

(see SU 1564241 A1, D 21 H 11/06, 15.05.1990).

At the same time as sulfite pulp using cellulose speed cooking with increased output (60-76%).

The use of high-strength cellulose speed of cooking gives you the opportunity to use in the composition cheaper fibrous components.

However, the cardboard box of known fibrous mass has a high enough strength and whiteness.

New technical result of the proposed use of the fibrous mass is to increase the strength properties while reducing the cost of packaging cardboard through the use of as sulfite pulp strength bleached bisulfite pulp, and as a wood pulp - chemical-thermomechanical pulp having high strength and whiteness.

This new technical result is achieved in that the fibrous material for the manufacture of the packaging material containing sulfite pulp, wood pulp and recycled fiber, as sulfite pulp contains bisulfite pulp hardness 30-35 ekapa, resistance to tearing, 430-460 mn and resistance to bursting 510-570 kPa, bleached to 84-86%, as wood pulp contains chemi-thermomechanical pulp with beleznai-75%, and as a secondary fiber paper contains brand MS-5B with the degree of grinding of 30 to 43°SHR in the following ratio of components mass (wt.%):

bisulfite pulp 52-60

chemical thermo mechanical pulp 20-38

the paper marks the MC-5B 10-20

Used in the inventive fibrous mass bisulfite pulp, characterized by rigidity 30-35 ekapa, resistance to tearing, 430-460 kPa and resistance to bursting 510-570 mn, has an output of 56-58% and obtained by cooking wood of coniferous and deciduous species at pH boiling solution of 1.6 to 2.3, the concentration of SO26,0-6,5% and the temperature 145-152°C.

The resulting pulp is subjected to bleaching under the traditional scheme to white 84-86%.

And as a secondary fibers offer fibrous material for the manufacture of the packaging material may further comprise a paper brand MS-6B with a beating degree of the pulp 33-38°SHR in the following ratio of components recycled fiber (wt.%):

the paper marks the MC-5B 80-90

paper brand MS-6B 10-20

Used paper brand MS-5B and MS-6B manufactured and complies with GOST 10700-97.

The paper marks the MC-5B belongs to the group B and characterized by the following composition: waste production and consumption of corrugated cardboard, paper and cardboard used in its production.

This poppy is Latour brand MS-5B may have a mass percentage of impurities is not more than 1%.

Paper brand MS-6B belongs to the group B and characterized by the following composition: waste production and consumption of cardboard of all types (except electrical insulation, roofing and footwear) with black-and-white and color printing.

This paper marks MS-6B may have a mass percentage of impurities is not more than 1.0%.

The combination of high strength fibrous semi-finished products proposed for use in compositions for packaging cardboard, allows you to get a cardboard box with high strength properties at sufficiently high whiteness.

The present invention is illustrated by the following examples.

Example 1. The fiber for the manufacture of packaging cardboard is prepared as follows: bisulfite pulp with Kappa number 30, which is characterized by resistance to tearing 430 mn and resistance to bursting 510 kPa, grind until 28°SHR and mixed with chemical-thermomechanical pulp with whiteness 72% and the degree of grinding 45°SHR and waste, crushed up 30°SHR, in the following ratio of components mass (wt.%):

bisulfite pulp 52

chemical thermo mechanical pulp 38

recycled stock 10

This paper uses a mixture of waste paper grades MS-5B and MS-6B at a ratio (%) MC-5B: MS-6B=85:15.

From the resulting fibrous mass is cast boxed paperboard weighing 175 g/m 2.

Used in the preparation of the fibrous mass bisulfite pulp get cooking wood mixture of coniferous and deciduous species at pH boiling solution of 1.6, the concentration of SO26.0 and temperature of cooking 145°s, followed by bleaching according to the standard scheme to white 84%.

Indicators of quality cardboard box in the table.

Example 2. The fiber for the manufacture of packaging cardboard is prepared as follows: bisulfite pulp with Kappa number, 35, characterized by resistance to tearing 460 mn and resistance to bursting 570 kPa, grind up to 35°SHR and mixed with chemical-thermomechanical pulp with whiteness of 75% and with the degree of grinding 50°SHR and paper, milled to 43°SHR, in the following ratio of components mass (wt.%):

bisulfite pulp 60

chemical thermo mechanical pulp 20

paper weight 20

This paper uses a mixture of waste paper grades MS-5B and MS-6B at a ratio (%) MC-5B: MS-6B=90:10.

From the resulting fibrous mass cast boxed paperboard weighing 175 g/m

Used in the preparation of the fibrous mass bisulfite pulp get cooking wood mixture of coniferous and deciduous species at pH boiling solution of 2.3, the concentration of SO26.5% and temperature of cooking 152°With, in the following the bleaching according to the standard scheme to white 86%.

Indicators of quality cardboard box in the table.

Example 3. Fibrous mass to prepare a box cardboard is prepared analogously to example 1, with the only difference that

as waste paper use waste paper brand MS-5B;

- waste paper grind up to 38°SHR.

Indicators of quality cardboard box presented in the table.

Example 4 (the prototype).

The fiber for the manufacture of packaging cardboard is prepared as follows: sulfite pulp from step cooking with the degree of grinding 30°SR mixed with recycled mass with the degree of grinding 45°SHR, white wood mass and EN masse in the following ratio of components (wt.%):

cellulose speed cooking 52,0

wood pulp 30,0

paper 17,5

scop 0,5

and bleached paperboard weighing 175 g/m2.

Indicators of quality cardboard box in the table.

As can be seen from the table, boxed cardboard obtained from the proposed fibrous mass has a higher whiteness, which ensures high quality of the coating process and increased mechanical strength.

1. Fibrous material for the manufacture of the packaging material containing sulfite pulp, wood pulp and recycled fiber, characterized in that h is about as sulphite cellulose it contains bisulfite pulp hardness 30-35% Kappa, resistance to tearing, 430-460 mn and resistance to bursting 510-570 kPa, bleached to 84-86%, as wood pulp contains chemi-thermomechanical pulp with whiteness 72-75%, and as a secondary fiber paper contains brand MS-5B with the degree of grinding of 30 to 43°SHR in the following ratio of components, weight, wt.%:

Bisulfite pulp 52-60

Chemical thermo mechanical pulp 20-38

The paper marks the MC-5B 10-20

2. Fibrous mass according to claim 1, characterized in that it contains bisulfite pulp obtained by cooking a mixture of softwood and hardwood at pH boiling solution of 1.6 to 2.3, the concentration of SO26,0-6,5% and the temperature 145-152°C.

3. Fibrous mass according to claim 1, characterized in that as a secondary fiber it contains waste paper brand MS-5B with a beating degree of the pulp 33-38°SHR.

4. Fibrous mass according to claim 1, characterized in that it further comprises a paper brand MS-6B with the degree of grinding of wastepaper pulp 33-38°SHR in the following ratio of components recycled fiber, wt.%:

The paper marks the MC-5B 80-90

Paper brand MS-6B 10-20



 

Same patents:

The invention relates to the pulp and paper industry and can be used in the manufacture of paper for corrugated cardboard

The invention relates to the pulp and paper industry and can be used in the manufacture of cardboard for flat layers of corrugated paperboard used in the manufacture of small packagings

The invention relates to a method for producing cardboard with a coating for packaging liquids belonging to the type that uses a sizing dispersion containing the water dispersion of rosins, synthetic sizing agent and aluminum connection

The invention relates to an open cage for reheating furnaces, comprising a cardboard base of thin or thick cardboard, provided with at least one layer of heat-resistant polymer coating

The invention relates to cardboard with high rigidity and packaging made from it

The invention relates to the pulp and paper industry, in particular to a method of manufacturing bases waxed paper intended for outdoor swivels confectionery machines

The invention relates to the pulp and paper industry and can be used for making paper mass consumption, for example, upon receipt of the printing paper for offset and gravure printing, typographical, Wallpaper, packaging cardboard or fiberboard

FIELD: paper-and-pulp industry.

SUBSTANCE: corn stems are reduced to fragment, boiled, ground, dispersed, flattened, and dried to produce paper sheets. Boiling is carried out for 1.5-4 h at ratio of aqueous solution of reagent to corn stem material between 3:1 and 6:1 and temperature 120-200°C.

EFFECT: achieved high quality of pulp, improved environmental condition, and reduced expenses.

5 cl, 2 tbl, 7 ex

FIELD: chemical and pulp-and-paper industry.

SUBSTANCE: aqueous suspension of at least one filler or mineral contains natural carbonate, polymeric dispersing agent as stabilizer of suspension viscosity, product of natural carbonate treatment with gaseous CO2, and product of natural carbonate reaction with at least one medium or strong H3O+-donors, has pH more than 7.5 at 200C. As natural carbonate suspension contains calcium carbonate (e.g., marble, calcite, carbonate-containing dolomite, chalk, ore mixtures thereof with talcum, and/or TiO2, MgO, or other minerals inert to H3O+-donors). As H3O+-donors suspension contains H2SO3, HSO

-4
, H3PO4, oxalic acid or mixtures thereof in molar ratio to carbonate of 0.1-2. Used carbon dioxide under pressure of 0.05-5 bar may be added from outside, recycled or obtained by continuous H3O+-donors addition. Treatment with H3O+-donors and gaseous CO2 may be carriedout simultaneously or separately, wherein in the last case temperature and time of respective stages are 5-900C and 1-5 h. Claimed suspension is dried to obtain colorant. Colorant has BET specific surface of 5-200 m2/g according to ISO 9277 and mean grain size measured by sedimentation method of 0.1-50 mum. Colorants are used in compositions, as agent for paper lamination, for paper pulp filling, coloration, and board production. Obtained paper is useful in numeric and ink-jet printing.

EFFECT: paper with decreased mass at constant surface.

33 cl, 1 dwg, 2 tbl, 8 ex

The invention relates to the pulp and paper industry and can be used in the manufacture of paper for corrugated cardboard

The invention relates to the pulp and paper industry and can be used in the manufacture of paper for corrugated cardboard

The invention relates to the pulp and paper industry and can be used in the manufacture of paper for corrugated cardboard

The invention relates to the pulp and paper industry and can be used in the manufacture of cardboard for flat layers of corrugated paperboard used in the manufacture of small packagings

The invention relates to the pulp and paper industry and can be used in the manufacture of cardboard for flat layers of corrugated paperboard used in the manufacture of small packagings

The invention relates to the pulp and paper industry and can be used in the manufacture of cardboard for flat layers of corrugated paperboard used in the manufacture of small packagings

The invention relates to the field of Kraft paper, and more specifically to a new method of its manufacture, designed to give a Kraft paper, a unique set of physical properties

FIELD: chemical and pulp-and-paper industry.

SUBSTANCE: aqueous suspension of at least one filler or mineral contains natural carbonate, polymeric dispersing agent as stabilizer of suspension viscosity, product of natural carbonate treatment with gaseous CO2, and product of natural carbonate reaction with at least one medium or strong H3O+-donors, has pH more than 7.5 at 200C. As natural carbonate suspension contains calcium carbonate (e.g., marble, calcite, carbonate-containing dolomite, chalk, ore mixtures thereof with talcum, and/or TiO2, MgO, or other minerals inert to H3O+-donors). As H3O+-donors suspension contains H2SO3, HSO

-4
, H3PO4, oxalic acid or mixtures thereof in molar ratio to carbonate of 0.1-2. Used carbon dioxide under pressure of 0.05-5 bar may be added from outside, recycled or obtained by continuous H3O+-donors addition. Treatment with H3O+-donors and gaseous CO2 may be carriedout simultaneously or separately, wherein in the last case temperature and time of respective stages are 5-900C and 1-5 h. Claimed suspension is dried to obtain colorant. Colorant has BET specific surface of 5-200 m2/g according to ISO 9277 and mean grain size measured by sedimentation method of 0.1-50 mum. Colorants are used in compositions, as agent for paper lamination, for paper pulp filling, coloration, and board production. Obtained paper is useful in numeric and ink-jet printing.

EFFECT: paper with decreased mass at constant surface.

33 cl, 1 dwg, 2 tbl, 8 ex

FIELD: paper-and-pulp industry.

SUBSTANCE: corn stems are reduced to fragment, boiled, ground, dispersed, flattened, and dried to produce paper sheets. Boiling is carried out for 1.5-4 h at ratio of aqueous solution of reagent to corn stem material between 3:1 and 6:1 and temperature 120-200°C.

EFFECT: achieved high quality of pulp, improved environmental condition, and reduced expenses.

5 cl, 2 tbl, 7 ex

FIELD: paper-and-pulp industry.

SUBSTANCE: pulp for manufacturing mainly box-destination cardboard contains sulfite cellulose, wood-pulp, and secondary fiber. Sulfite cellulose is, more particularly, bisulfite cellulose bleached to 84-86% and having rigidity 30-35 Kappa units, tear resistance 430-460 mN, and punching resistance 430-460 mN. Such bisulfite cellulose is obtained by pulping mixture of softwood and foliferous wood at pH of cooking liquor 1.6-2.3, SO2 concentration 6.0-6.5%, and temperature 145-152°C. Wood-pulp is the one subjected to chemical, thermal, and mechanical treatment and characterized by whiteness 72-75%. Secondary fiber is ground paper waste with specified degree of grinding, optionally in the form of blend of differently ground marks.

EFFECT: improved strength characteristics and reduced manufacturing expenses.

4 cl, 1 tbl, 4 ex

Up!