FI68692C - AVFIBERMATERIAL FRAMSTAELLD SKIVA - Google Patents

Description

! 68692

This invention relates to the field of the manufacture of paperboard, and more particularly to the manufacture of paperboard from fibrous material of plant origin. The invention is most preferably used in the manufacture of multilayer cartons, such as container carton used to form corrugated corrugated layers, box carton used in the manufacture of boxes for packaging consumer goods and food products, flag and insole cartons used in this order for making leather shoes and alternatively for shoe shoes.

As is known, according to the manufacturing technique, cartons are classified into single ply and multilayer cartons.

15 The fibrous material for the manufacture of board is cellulose, hemicellulose, wood pulp and waste materials. Single ply board is made by applying a pulp layer to the endless wire of a board machine.

Cardboard-20 consisting of two or more layers is made by successively applying the first and subsequent layers to a wire or by joining and compressing separate, carded machine-made layers of cardboard, the outer layers being called surface layers and the inner layers being called base layers. If the board is 25 double-layered, the top layer is called the top layer and the bottom layer is called the base layer.

According to its composition, the single ply board is made of a single material of plant origin or a mixture of a few different materials. The two-ply or multi-ply boards may be made of a similar material or may have a multi-component composition in which the ratios between the components are different in different layers. High-quality, fine traditional materials are used for the outer layers. The use of low-quality ma-35 materials in the inner layers makes it possible to reduce the consumption of high-quality fibrous materials and lower the cost of the board, while its main properties remain 2,68692. However, the manufacture of paperboard usually requires a considerable amount of materials of plant origin.

Multilayer board is known in the art (cf. Soviet Copyright Certificate No. 566 897, Int. Cl D 21 H 5 1/100, 5/100 published July 30, 1977), which contains 98.69% by weight of fibrous material of vegetable origin in its surface and base layers. amount.

To improve the physico-mechanical properties of the board, sodium aluminate 10 and talc are added to the base layers. However, the production of such board requires only material of plant origin.

Cardboards are widely known in which, in order to save expensive cellulosic fiber, a considerable amount of it has been replaced by waste material.

15 However, the waste material represents a spent fibrous material which is also a material of plant origin and therefore does not solve the problem of saving this material. To this end, studies were conducted to reduce the consumption of plant materials by replacing them with cheaper components.

Soviet Copyright Certificate No. 440 468, Int. Cl. According to D 21 H 3/100, published August 25, 1974, some activated sludge obtained as a waste product of biological waste-water treatment is fed to the pulp before the formation of the bed. Making paperboard from pulp containing fibrous material and sludge made it possible to obtain cheaper paperboard. However, there are numerous serious disadvantages in the board manufacturing process in which the activated sludge is fed directly into the pulp. When such a carton of 30 cartons is produced on a board machine, a considerable amount of the slurry falls through the wire, i.e., the production of the carton with maximum slurry retention is quite difficult. To reduce the amount of sludge falling through the wire and to enhance dewatering, the use of chemicals is required. II-35 man use such substances, fine sludge particles fall through the paper machine wire. However, adsorbed sludge particles interfere with water removal. At the same time, the 3,686,900 suspended particles contaminate the trough water and thus the load on the local treatment plants increases, which also increases the consumption of chemicals for wastewater treatment.

The main object of the present invention is to reduce the consumption of plant-derived materials in the production of high-quality paperboard by replacing one of its vegetable-derived layers with activated sludge, which is a waste product of biological treatment of wastewater treatment plants of both paperboard and other mills.

To achieve this main object, there is provided a paperboard made of a fibrous material of plant origin, consisting of surface and base layers, wherein according to the invention one of the base layers 15 is made entirely of activated sludge in a weight ratio of 85-99.5% activated sludge .5 - 15.0 20 Activated sludge represents an accumulation of microorganisms involved in the biological waste treatment process. During the biological oxidation of organic matter in the wastewater, the activated sludge continuously increases its biomass, part of which must be removed from the system. This is the so-called excess sludge, 25 which is a waste product from board production. As a result of the activity of microorganisms, the activated slurry is characterized by a high protein content of 30-50% by weight. Due to its proteinaceous nature, the slurry can be used in the manufacture of paperboard, in particular one of the base layers can be made entirely of active slurry. The sludge layer is applied on top of a layer of fibrous material of plant origin. The use of sludge in the manufacture of paperboard provides better cohesiveness between the fibers of the fibrous material. This makes it possible to produce paperboard with good physical-mechanical properties with the simultaneous utilization of activated sludge, which is a waste product.

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The most suitable sludge content in the finished product is 0.5-15% by weight. A sludge content of less than 0.5% results in insufficient cohesiveness between the fibers and a sludge content of more than 15% results in a deterioration of the dewatering properties of the paper web.

The fibrous material of plant origin consists of wood fiber with varying degrees of lignin removal. In the cooking or chemical-mechanical treatment process of wood chips, lignin is removed from it and cellulose, hemicellulose or chemical wood pulp is obtained according to the amount of lignin remaining in the final product. The pulp is obtained by mechanical treatment of materials of plant origin. Said fibrous materials are used in the manufacture of paper, board and fibreboard.

Thus, in the manufacture of multilayer board, which is generally made of a single fibrous material or a combination of the above materials, one of the base layers may be replaced by an activated slurry.

It is suitable to incorporate binders and precipitants into the board made of fibrous material of plant origin, the ratio of the components in the total mass of the board being as follows by weight: fibrous material 55 to 96.5 activated sludge 0.5 to 15.0 25 binder 0.5 to 20.0 precipitant 2.5-10.0

Depending on the function of the board, it may contain a binder and a precipitant in combination. These components provide a reduction in water absorption, improve moisture-30 durability, and generally improve the strength properties of the board. The cartons, which are intended for the production of products for short-term use (boxes, flags), are made without the use of binders. It is appropriate to use rosin and pitch adhesives and latices as a binder, with cheaper pitch-35 adhesives and latexes being the more preferred alternative to natural rosin adhesive.

11 5 68692

The rosin adhesive consists of a mixture of rosin acids neutralized with alkali and suspended in water. Depending on the amount of alkali added, the adhesive may contain varying amounts of free acids.

5 Adding rosin glue to the pulp reduces the absorption of water and aqueous solutions.

The pitch glue is formed by the distillation residue of the vacuum distillation of tar oil, consisting of polymerized fatty and resin acids and their esters, oxyacid ester substances, soap, and inorganic salts. During the glue cooking, the acid components are neutralized with soda ash. The consumption of pitch glue for bonding board is higher than that of rosin glue, but its price is substantially lower.

Synthetic latexes are commonly used in the papermaking industry. They consist of an aqueous dispersion of polymers stabilized with surfactants. Chlorobutadiene styrene latexes are the most commonly used. Latexes are useful for improving both the wet and dry strength properties of paperboard.

20 Cardboard made of fibrous material of plant origin uses alumina, sodium aluminate or a mixture thereof as a precipitant. A binder and then a precipitator are successively added to the pulp from which the surface and base layers are made, with the exception of the slurry layer, to attach the binder to the fibers, changing the charge of the fibers as the binder particles precipitate on the fibers.

The use of sludge, which is a biological waste product from the treatment of wastewater, for the production of a single layer of multilayer board makes it possible to save materials of plant origin and at the same time improve the physico-mechanical properties of the board due to the protein nature of the activated sludge. When incorporated into the board, the protein contained in the activated sludge, which also has binding properties, also makes it possible to save expensive binding materials, reduce sludge treatment costs in sewage treatment plants, eliminate the addition of chemical additives from the pulp web to improve sludge and prevent slurry. thereby reducing the load on in-house wastewater treatment plants.

5 In order to achieve the good physico-mechanical properties of the board, the above-mentioned ratio between the components is used.

The paperboard according to the invention is produced in the following manner. The 10 fibrous raw materials fed as a liquid stream from the preparation section are ground in a refiner (refiner, refiner) to a value of 21-30 ° SR (Schopper-Riegler grades) according to the product. The fibrous raw material is then diluted with water to a concentration of 5-15 g / l, the binder and the precipitant are added and the resulting pulp is passed through a feeder called a pressure box to the board machine wire for sheet-forming. Activated sludge is fed directly from the plant's biological waste treatment plant at a concentration of 10-30 g / l after gravity compression or at a concentration of 30-50 g / l after flotation compression 20 into aerated collecting tanks installed in the board mill. The slurry of activated slurry is fed between the layers of fibrous material by means of a special flow device placed either on the wire of the board machine between the pressure boxes 25 of the surface and base layers or between the forming cylinders of the cylinder board. The amount of sludge fed in absolute dry matter can vary between 5 and 150 kg per tonne of product obtained.

The spread layers of the pulp web are carried by a moving wire and gradually dewatered. Thereafter, a sheet of 30 with a moisture content of 85-80% passes through the presses of the machine where it is pressed to a moisture content of 65-55%.

The paperboard is then dried to a moisture content of 5-8% in the drying section of the machine, which passes over the heated cylinders.

It should be noted that the sludge can be used in board made on different types of board machines.

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The quality control of the obtained board is performed with respect to the following factors: puncture resistance, ring crushing strength, refractory strength (determined by the number of double folds), tensile strength tested by a traction machine and thickness as indicated by the thickness gauge.

Typical examples are provided below which illustrate the features of the present invention and most clearly reveal its features and advantages.

Example 1 10 A board with a weight of 200 g / m 2 was prepared for smooth layers of corrugated board using the following composition in weight percent: unbleached sulphate cellulose 93.3 activated sludge 3.0 15 rosin glue 1.0 alumina 2.5

The unbleached softwood sulphate pulp, concentrated to 3% and fed as a liquid stream from the pretreatment section, was ground to 25 ° SR. Then, in a special tank with 20 mixing devices, 10.2 kg of rosin glue was fed to a pulp containing 1,018 kg of fiber as dry matter at a concentration of 20 g / l, which was then precipitated on the fibers with 25.5 kg of alumina. . The concentration of the alumina solution was 25,100 g / l. The prepared raw material was fed to form surface layers. 32.6 kg of activated sludge from a wastewater treatment plant, mixed in an aerated collection tank and having a concentration of 20 g / l dry matter containing 40% protein, was fed between the surface layers. The pulp web consisting of three to 30 layers was dewatered with a cardboard machine wire, pressed between rolls to a moisture content of 60% and dried on heated cylinders to a moisture content of 8%.

The puncture strength was 1,568 kPa (kiloPascals), the ring-35 had a crushing strength of 268 N (Newtons) and the refractive index was 1,810 (see Table 1).

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Example 2

Cardboard was prepared using the following composition in weight percent: unbleached sulphate cellulose 90.5 5 activated sludge 6.0 rosin glue 1.0 alumina 2.5

The consumption of the components in kg was 98.5, 65.3, 9.8 and 24.5, respectively.

10 The procedure was the same as in Example 1.

The puncture strength was 1,601 kPa, the ring crush strength was 256 N, and the flexural strength was 1,906 (see Table 1). Example 3

Cardboard was prepared using the following composition in weight percent: unbleached sulfate cellulose 87.5 activated sludge 9.0 rosin glue 1.0 alumina 2.5 The consumption of the components in kg was 95.2, 98, 9.5 and 23.8, respectively.

The procedure was the same as in Example 1.

The puncture strength was 1,568 kPa, the ring crush strength was 256 N, and the flexural strength was 2,118 (see Table 1).

25 Example 4

Cardboard was prepared using the following composition by weight: unbleached sulphate cellulose 81.5 activated sludge 15.0 30 rosin glue 1.0 alumina 2.5

The consumption of the components in kg was 887, 163, 8.9 and 22.3, respectively.

The procedure was the same as in Example 1.

35 The puncture strength was 1,499 kPa, the ring crush strength was 253 N and the flexural strength was 1,800 (see Table 1).

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Example 5 (for comparison)

Cardboard was prepared according to the prior art from an assembly having the following ratios of components by weight: 5 unbleached sulfate cellulose 96.5 rosin glue 1.0> alumina 2.5

The consumption of the components in kg of absolutely dry material was 1,050, 10.9 and 27.3, respectively.

10 The procedure was the same as in Example 1, except for the formation of a single layer of slurry.

The puncture strength in the reference type was 1,323 kPa, the ring crushing strength was 252 N and the breaking strength was 1,700 (see Table 1).

Thus, the board for the smooth layers of corrugated board made using the activated slurry according to Examples 1-4 has better strength properties: the puncture strength increases by 13-21% and the ring crushing strength increases by 0.3-6.3%: with.

20 Table 1

Cardboard for smooth layers of corrugated cardboard

Strength om-. . Example 1 Example 2 Example 3 Example 4 Example 5 femininity (ver. Var_ 25 ten)

Puncture strength 1,568 1,607 1,568 1,499 1,329 (kPa) (18.0) (21.0) (18.0) (5.6)

Tire crushing- 268 256 256 253 252 strength (N) (6,3) (1,1) (1,1) (0,4) 30 Folding resistance 1 810 1 906 2 118 1 800 1 700 strength (double (6 , 64) (12.0) (24.5) (6.0) number of folds)

Note. A 35% improvement in strength property is given in parentheses compared to the reference type 4 10 68692

Example 6

Box board weighing 2,400 g / m was prepared using the following composition by weight: waste material (waste paper) 97.0 5 activated sludge 3.0 Waste paper fed as a liquid stream from the pre-preparation section in an amount of 1,018 kg of dry matter was ground to 22- 25 ° SR, was diluted to a concentration of 0.3% and fed to the cylinder tubs of a paperboard machine to form a fiber layer of paperboard. 32 kg of activated sludge from the wastewater treatment plant, which was mixed in an aerated collection tank at a concentration of 20 g / l and containing 40% protein, was fed between the two inner layers of the formed paperboard web by means of a special device.

The paperboard was then pressed between pressure cylinders and dried on the drying cylinders of a paperboard machine. The tensile strength was 18.2 N and the flexural strength was 55 (see Table 2).

Example 7

Cardboard was prepared using the following composition in 20% by weight: waste paper 94.0 activated sludge 6.0

The consumption of the components in kg was 987 and 63, respectively.

25 The procedure was the same as in Example 6.

The tensile strength was 17.6 N and the flexural strength was 55 (see Table 2).

Example 8

Cardboard was prepared using the following composition in 30% by weight: waste paper 91.0 active glue 9.0

The consumption of the components in kg was 955 and 95, respectively. The procedure was the same as in Example 6.

35 The tensile strength was 17.2 N and the flexural strength was 58 (see

Table 2).

Il φ 11 68692

Example 9

Cardboard was prepared using the following composition by weight: waste paper 85.0 5 activated sludge 15.0

The consumption of the components in kg was 892 and 158, respectively.

The procedure was a sauna as in Example 6.

The reference strength was 16.3 N and the flexural strength was 48 10 (see Table 2).

Example 10 (for comparison)

Cardboard was made from waste paper according to the prior art. The consumption of absolute dry fibrous material to obtain 1 ton of product was 1,050 kg. The preparation procedure was the same as in Example 6 except for the formation of a single layer of slurry. The reference type had a tensile strength of 15.7 N and a refractive index of 47 (see Table 2).

Thus, the box board made using activated sludge according to Examples 6-9 and whose main strength property is tensile strength exceeds the same value of the reference type by 4-16%.

Example 11 2

Cardboard was prepared for smooth layers of 25 corrugated board weighing 200 g / cm using the following composition as a percentage by weight: unbleached sulphate cellulose 90.5 activated sludge 6.0 rosin glue 1.0 30 alumina 2.5

The procedure was the same as in Example 1 except that the activated slurry contained 31% protein.

The puncture strength was 1,519 kPa, the ring crush strength was 254 N, and the flexural strength was 1,780 (see Table 3).

35 12 68692

Table 2

Strength- Cartonboard property Example 6 Example 7 Example 8 Example 9 Example 10 (for 5)

Thickness (mm) 0.6 0.6 0.6 0.6 0.6

Density (g / cm 2) 0.6 0.6 0.6 0.6 0.6

Tensile strength (N) 18.2 17.6 17.2 16.3 15.7 (16.0) (12.0) (10.0) 10 Folding strength 55 56 58 48 47 (double folding (17.0) ( 19.0) (23.4) (2.1) number of people)

Note. The percentage improvement in strength property compared to the control type is given in parentheses.

15 Example 12

Cardboard for smooth layers of corrugated board was prepared using the following composition as a percentage by weight.

unbleached sulphate cellulose 90.5 20 activated sludge 6.0 rosin glue 1.0 alumina 2.5

The procedure was the same as in Example 1 except that the activated slurry contained 48% protein.

25 The puncture strength was 1,627 kPa, the ring crush strength was 263 N and the flexural strength was 2,070 (see Table 3). Example 13 (for comparison)

Cardboard for smooth layers of corrugated board was prepared using the following composition in 30% by weight: unbleached sulphate cellulose 96.5 rosin glue 1.0 alumina 2.5

The procedure was the same as in Example 1 except for the preparation of the activated sludge layer. The puncture strength was 1,323 kPa, the ring crush strength was 252 N and the flexural strength was 1,700.

13,68692 Thus, paperboard intended for smooth layers of corrugated board made using activated sludge having different protein contents according to Examples 11 and 12 has better strength properties. The puncture strength increases by 15-23% and the ring crushing strength increases by 1-4% (see Table 3).

Example 14

A carton weighing 2,400 g / m was prepared using the following composition as a percentage by weight: 10 waste papers 94 activated sludge 6

The procedure was the same as in Example 6 except that the activated slurry contained 31% protein.

The tensile strength was 16.8 N and the flexural strength was 52 15 (see Table 4).

Table 3

Corrugated cardboard for smooth ply-Strength feature cardboard for this purpose

Example 11 Example 12 Example 13 20 (vert. Var ten)

Puncture resistance (kPa) 1,519 1,627 1,323 (15.0) (23.0)

Tire crushing strength (N) 254 263 252 25 (1.0) (4.0)

Folding strength (number of double 1,780 2,070 1,700 folds) (4.7) (22.0)

Note. The percentage improvement in strength property compared to the control type is given in parentheses.

30 Example 15

A carton weighing 400 g / m 2 was prepared using the following composition as a weight percent: waste paper 94 activated sludge 6 35 The procedure was the same as in Example 6 except that the activated sludge contained 48% protein. The tensile strength was 17.8 N and the flexural strength was 61 (for the reference type, see Example 10 in Table 4).

Thus, a carton made by adding activated sludge having a different protein content according to Examples 7, 14 and 15 has better strength properties compared to a carton made according to the prior art. Tensile strength increases by 7-13%. Table 4

Cardboard box

Strength property Example 14 Example 15 Example 10 (for 10)

Thickness (mm) 0.6 0.6 0.6

Density (g / cm3) 0.6 t 0.6 0.6

Reference strength (N) 16.8 17.8 15.7 (7.0) (13.3) 15 Folding strength (number of double 52 61 47 folds (10.6) (29.8)

Note. The percentage improvement in strength property compared to the control type is given in parentheses.

Example 16 A paperboard for bonding layers of corrugated board weighing 200 g / m 2 was prepared using the following composition by weight: unbleached sulphate cellulose 89.5 activated sludge 6.0 25 rosin glue 1.0 alumina 3.5

The consumption of the components in kg was 984, 66.3, 9.8 and 34.3, respectively.

The procedure was the same as in Example 1. The puncture-seal cheese was 1,372 kPa, the ring crush strength was 245 N, and the refractive index was 1,750 (see Table 5).

Example 17

According to the prior art, paperboard was prepared having the following composition in 35% by weight: unbleached sulphate cellulose 95.5 rosin glue 1.0 alumina 3.5 68692

The consumption of the components in kg was 1,050, 10.5 and 36.8, respectively.

The puncture strength was 1,137 kPa, the ring crushing strength was 196 N and the flexural strength was 1,700 (see Table 5).

Thus, board for smooth layers of corrugated board made using activated sludge according to Example 16 has better strength properties: puncture strength increased by 20% and ring crushing strength increased by 25%.

10 Example 18

Cardboard was prepared using the following composition in weight percent: unbleached sulphate cellulose 91.0 activated sludge 6.0 15 rosin glue 1.0 alumina 1.8 sodium aluminate 0.2

The consumption of the components in kg was 985, 65, 99, 17.8 and 0.22, respectively. The procedure was the same as in Example 1. 20 The puncture strength was 1,421 kPa, the ring crushing strength was 255 N and the breaking strength was 1,900 (see Table 5).

Ta.u.luKH.0Board for smooth layers of corrugated board 25 Strength property Eg 16 Example 17 Example 18 Example 19 (vert, var- (for vert.) Ten)

Puncture resistance (kPa) 1,372 1,137 1,421,147 (21.0) (24.0)

Tire crushing strength 245 196 255 216 30 (N) (25) (18)

Folding strength 1,750 1,700 1,900 1,730 (number of double folds (3.0) (10.0))

Note. An improvement in strength property of 35% compared to the control type is given in parentheses.

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Example 19 (for comparison)

Cardboard was prepared according to the prior art using the following composition in weight percent: unbleached sulphate cellulose 97 5 rosin glue 1 alumina 1/8 sodium aluminate 0.2

The consumption of the components in kg was 1,050, 10.5, 18.9 and 2.1, respectively. The procedure was the same as in Example 1.

10 The puncture strength was 1,147 kPa, the ring crush strength was 216 N and the flexural strength was 1,730.

Thus, paperboard for smooth layers of corrugated board made using activated sludge according to Example 18 has better strength properties: puncture strength increased by 24% and ring crushing strength increased by 18% (see Table 5).

Example 20 2

A board for smooth layers of 200 g / m corrugated board was prepared using the following 20% by weight compositions: unbleached sulphate cellulose 90 activated sludge 6 latex 0.5 alumina 3.5 The consumption of the components in kg was 984.4, 65.6, 4.9 and 34.3. The procedure was the same as in Example 1. The puncture strength was 1,530 kPa, the ring crush strength was 254 N, and the flexural strength was 1,870 (see Table 6).

Example 21 (for comparison) 30 Cardboard was prepared according to the prior art using the following composition in weight percent, unbleached sulphate cellulose 96 latex 0.5 alumina 3.5 35 The consumption of the components in kg was 1,050, 5.3 and 37.1, respectively. The procedure was the same as in Example 1. The puncture strength was 1,303 kPa, the ring crushing strength was 242 N and the breaking strength was 1,600.

π 68692 Thus, paperboard intended for smooth layers of corrugated board made using activated sludge according to Example 20 has better strength properties: puncture strength increased by 18% and ring-5 crushing strength increased by 5% (see Table 6).

Example 22 2

Cardboard for smooth layers of corrugated board weighing 200 g / m 2 was prepared using the following composition in weight percent: 10 unbleached sulphate cellulose 77 activated sludge 6 latex 10 alumina 7

The consumption of the components in kg was 974, 15 76, 97.4 and 68, respectively. The procedure was the same as in Example 1. The peel strength was 1,519 kPa, the ring crush strength was 250 N and the refractive index was 1,810 (see Table 6).

Example 23 (for comparison)

Cardboard was prepared using the following composition in 20% by weight: unbleached sulphate cellulose 83 latex 10 alumina 7

The consumption of the components in kg was 1,050, 25,105 and 73.5, respectively. The procedure was the same as in Example 1. The puncture resistance in the reference type was 1,254 kPa, the ring crushing strength was 245 N and the refractive index was 1,720 (see Table 6).

Thus, paperboard for smooth layers of corrugated board made using activated sludge according to Example 22 has better strength properties: puncture strength increased by 21% and ring crushing strength increased by 2%.

Example 24 2

Cardboard for smooth packs of corrugated board weighing 200 g / m 3 was prepared using the following composition in weight percent: 18,686,692 unbleached sulphate cellulose 77 activated sludge 6 latex 10 alumina 7 5 Consumption of components in kg was 974, 76, 97.4 and 85.7 . The procedure was the same as in Example 1. The puncture strength was 1,529 kPa, the ring crush strength was 245 N, and the flexural strength was 1,790 (see Table 6). Example 25 (for comparison) 10 Cardboard was prepared using the following composition by weight: unbleached sulphate cellulose 83 latex 10 alumina 7 15 The consumption of the components in kg was 1,050, 105 and 73, respectively. The procedure was the same as in Example 1. The puncture resistance was 1,313 kPa. the ring crushing strength was 232 N and the flexural strength was 1,750 (see Table 6).

Thus, paperboard for bonded layers of corrugated board made using activated sludge according to Example 24 has better strength properties: puncture strength increased by 15% and ring crushing strength increased by 6%.

Example 26 2 25 Cardboard for smooth layers of corrugated board weighing 200 g / m was prepared using the following composition by weight: unbleached sulphate cellulose 64 activated sludge 6 30 latex 20 alumina 10

The consumption of the components in kg was 960, 90, 192 and 96, respectively. The procedure was the same as in Example 1. The puncture strength was 1,225 kPa, the ring crushing strength was 226 N 35 and the breaking strength was 1,780 (see Table 6).

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Example 27 (for comparison)

Cardboard was prepared using the following composition in weight percent: unbleached sulfate cellulose 70 5 latex 20 alumina 10

The consumption of the components in kg tin was 1,050, 210 and 105, respectively. The procedure was the same as in Example 1. The puncture resistance was 1,196 kPa, the ring crushing strength was 220 N and the refractive index was 1,600 (see Table 6).

Thus, paperboard for smooth layers of corrugated board made by adding activated sludge to its composition according to Example 26 has better strength properties: puncture strength increased by 24% and ring crushing strength increased by 3%.

Table 6

Cardboard for smooth layers of corrugated board

Strength properties Example 20 Example 21 Example 22 Example 23 (vert, var- (for vert.) Ten) 20 Puncture strength 1 539 1 309 1 519 1 254 (kPa) (17.9) (21)

Ring crushing- 254 242 250 245 cheese (N) (5,0) (2,0)

Folding strength 1,870 1,600 1,810 1,720 25 (17.0) (5.2)

Table 6 (continued)

Cardboard for smooth layers of corrugated board

Example 24 Example 25 Example 26 Example 27 (ver. Var- (for ver.) Ten) 30 1 529 1 313 1 225 1 196 (15,8) (24) 245 232 226 220 (5,6) (3.0) 1,790 1,750 1,780 1,600 35 (2.2) (11.3) 2o 68692

Note. The percentage improvement in strength property compared to the control type is given in parentheses.

Example 28 2

Cardboard for smooth packs of corrugated board weighing 200 g / m 2 was prepared using the following composition in weight percent: unbleached sulphate cellulose 90.7 activated sludge 6 pitch glue 0.8 10 alumina 2.5

The consumption of the components in kgrin was 985, 65, 7.90 and 19.8, respectively. The procedure was the same as in Example 1. The puncture strength was 1,578 kPa, the ring crush strength was 265 N, and the flexural strength was 1,790 (see Table 7).

15 Example 29 (for comparison)

Cardboard was prepared using the following composition by weight: unbleached sulphate cellulose 96.7 pitch glue 0.8 20 alumina 2.5

The consumption of the components in kg was 1,050, 8.4 and 26.3, respectively. The procedure was the same as in Example 1. The puncture strength was 1,343 kPa, the ring crush strength was 250 N, and the flexural strength was 1,750 (see Table 7).

Thus, paperboard intended for smooth layers of corrugated board made using activated sludge according to Example 28 has better strength properties: puncture strength increased by 17% and ring crushing strength increased! 6%.

30 Example 30 2

Cardboard for smooth layers of corrugated board weighing 200 g / m was prepared using the following composition in weight percent: unbleached sulphate cellulose 90 35 activated sludge 6 pitch glue 1.5 alumina 2.5 2i 68692

The consumption of the components in kg was 984, 66, 14.8 and 24.0, respectively. The procedure was the same as in Example 1. The puncture strength was 1,597 kPa, the ring crush strength was 257 N, and the flexural strength was 1,805 (see Table 7).

5 Example 31 (for comparison)

Cardboard was prepared using the following composition by weight: unbleached sulphate cellulose 96 pitch glue 1.5 10 alumina 2.5

The consumption of the components in kg was 1,050, 15.8 and 26.3, respectively. The procedure was the same as in Example 1. The paperboard prepared according to this method had a puncture resistance of 1,333 kPa, a ring crushing strength of 253 N and a breaking strength of 1,770 (see Table 7).

Thus, paperboard for smooth layers of corrugated board made using activated sludge according to Example 30 has better strength properties: puncture strength increased by 20% and ring-20 gas crushing strength increased by 1.6%.

Example 32 2

Cardboard for smooth layers of corrugated board weighing 200 g / m was prepared using the following composition in weight percent: 25 unbleached sulphate cellulose 89 activated sludge 6 pitch glue 1.5 alumina 3.5

The consumption of the components in kg was 994, 30, 56, 14.9 and 34.8, respectively. The procedure was the same as in Example 1.

The puncture strength was 1,558 kPa, the ring crush strength was 257 N, and the flexural strength was 1,820 (see Table 7). Example 33 (for comparison)

Cardboard for smooth layers of corrugated board was prepared using the following composition in weight percent: 22 6 8 6 9 2 unbleached sulphate cellulose 95 pitch glue 1.5 alumina 3.5

The consumption of the components in kg was 1,050, 15, 15.8 and 36.8, respectively. The procedure was the same as in Example 1. The puncture strength in the control type was 1,362 kPa, the ring crushing strength was 252 N and the flexural strength was 1,770 (see Table 7).

Thus, paperboard made using ak-10 sealing slurry according to Example 32 has better strength properties: puncture strength increased by 14% and ring crushing strength increased by 2%.

Example 34 2

Cardboard for smooth packs of corrugated board weighing 200 g / m 2 was prepared using the following composition in weight percent: unbleached sulphate cellulose 91.2 activated sludge 6 pitch glue 0.8 20 alumina 1.8 sodium aluminate 0.2

The consumption of the components in kg was 985, 65, 7.88, 17.73 and 2.0, respectively. The procedure was the same as in Example 1. The puncture strength was 1,593 kPa, the ring crush strength was 25,266 N, and the flexural strength was 1,820 (see Table 7).

Example 35 (for comparison)

Cardboard was prepared using the following composition in which the ratio of the components by weight was as follows: 30 unbleached sulphate cellulose 97.2 pitch glue 0.8 alumina 1.8 sodium aluminate 0.2

The consumption of the components in kg was 1,050, 35 8.4, 18.9 and 0.21, respectively. The procedure was the same as in Example 1

The puncture strength in the reference type was 1,352 kPa, the ring crushing strength was 250 N and the breaking strength was 1,750 (see Table 7).

23 68692 Thus, paperboard intended for smooth layers of corrugated board made using activated sludge according to Example 34 has better strength properties: puncture strength increased by 18% and ring crushing-5 seasonal strength increased by 6%.

Table 7

Cardboard folded into smooth layers of corrugated cardboard

Strength properties Example 28 Example 29 Example 30 Example 31 (vert, var- (for vert.) Ten 10 Puncture strength 1 578 1 343 1 597 1 333 (kPa) (17.5) (20)

265 250 257 253 cheese crushing (N) (6.0) (1/6)

Folding strength 1,790 1,750 1,805 1,770 15 (2.2) (2.0)

Table 7 (continued)

Cardboard for smooth layers of corrugated board

Example 32 Example 33 Example 34 Example 35 (ver. Var- (for ver.) Ten) 20 1 558 1 362 1 593 1 352 (14) (17.8) 257 252 266 250 (2.0) (6.4) 1,820 1,790 1,820 1,750 25 (1.7) (4.0)

Note. The percentage improvement in strength property compared to the control type is given in parentheses.

Thus, the use of sludge according to the present invention makes it possible to save 5-100 kg / t of plant-derived fibrous materials / plant product, eliminate the activated sludge dewatering workshop and consequently reduce the consumption of chemicals and electrical energy and prevent soil contamination by drained sludge. The production of a single paperboard layer from the activated slurry 35 results in a portion of the slurry remaining more completely in the 24,686,92 paperboard sheets, thereby preventing the sludge from falling through the wire and at the same time reducing the load on the in-house wastewater treatment plants.

The use of a slurry in a paperboard assembly provides the high strength properties of the resulting product.

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Claims (4)

68692 Cardboard made of fibrous material of plant origin, consisting of surface and base layers, characterized in that one of the base layers is made entirely of activated sludge, the composition of the board being as follows by weight: fibrous material 85-99.5 active sludge 0.5-15.0 2. Cardboard made of fibrous material of vegetable origin, consisting of surface and base layers, characterized in that one of the base layers is made entirely of activated sludge and additionally contains an adhesive and a precipitant, all components being included in the board in the following percentages by weight degree: fibrous material 55-96.5 activated sludge 0.5-15.0 adhesive 0.5-20.0 20 precipitant 2.5-10.0 Cardboard according to Claim 2, characterized in that colon adhesive, pitch adhesive or latex is used as the adhesive. Cardboard according to Claim 2, characterized in that alumina, sodium aluminate or a mixture thereof is used as precipitant.