Sack Paper
Sack Paper
- Segezha Group is the world’s fourth-largest manufacturer of unbleached sack paper which competes on equal footing with the produce of the world market leaders and is exported to almost 60 countries of the world.
- Sack paper is manufactured by Segezha Pulp and Paper Mill (Segezha city, Republic of Karelia) from unbleached craft pulp. The pulp is manufactured from the wood of Northern coniferous species. Segezha Pulp and Paper Mill offers the whole range of brown sack papers. Such paper is the most common packaging material and is widely used for the production of paper sacks, bags, wrappings, envelopes, etc.
- The paper has unique tensile strength. Its porosity, or air permeability, makes it even more durable. Porosity is essential for tensile energy absorption; its value is determined by laboratory testing as time required for passing of 100 ml air through a circle of 28.7 mm in diameter.
- In order to decrease moisture absorption, paper is subjected to stock sizing. Wet strength is facilitated by addition of moisture-resistant resins. They allow the paper to retain 20 to 30% of its initial strength after complete soaking in water.
PULP AND PAPER MILL MODERNIZATION
Paper machine BDM-11 has been supplied under a contract with Voith Concern which is the world leading paper and pulp industry equipment manufacturer. The cost of the equipment exceeds EUR 80 million. The last launch of such powerful equipment took place back in the Soviet times. The launch of BDM-11 will allow Segezha Group to boost its sack paper manufacturing capacity by one-third.
The launch of the new BDM-11 will increase the share of high-porosity and at the same time strong papers in the Company’s portfolio. These types of paper will make it possible to make lighter paper bags with less paper layers in them. Such paper bags will provide for the product’s transport safety and null dusting, and will possess a number of other outstanding qualities.
Specification of sack paper manufactured by Segezha Group:
- Roll width: 650 to 2000mm
- Roll diameter: 800 to 1200 mm
- Inner tube diameter: 76 or 102 mm.
The paper is used for the production of paper wrappers suitable for carrying small weights, such as retailer bags with handles, charcoal or pet litter bags, etc.
|
Properties |
Testing method |
SKI-70 | SKI-80 | SKI-90 | SKI-100 | |
|---|---|---|---|---|---|---|
|
Grammage, g/m2 |
ISO 536 (GOST 13199) |
70 | 80 | 90 | 100 | |
|
Ultimate tensile strength, kN/m |
MD | ISO 1924-3 | 7,0 | 8,0 | 9,0 | 9,5 |
| CD | 4,9 | 5,6 | 6,3 | 7,0 | ||
|
Tensile index, Nm/g |
MD | 100 | 100 | 100 | 95 | |
| CD | 70 | 70 | 70 | 70 | ||
|
Stretch at break, % |
MD | 2,5 | 2,5 | 2,5 | 2,5 | |
| CD | 7,0 | 7,0 | 6,7 | 6,7 | ||
|
Tensile energy absorption, J/m2 |
MD | 110 | 120 | 135 | 150 | |
| CD | 225 | 240 | 260 | 290 | ||
|
Tensile energy absorption index, J/g |
MD | 1,6 | 1,5 | 1,5 | 1,5 | |
| CD | 3,2 | 3,0 | 2,9 | 2,9 | ||
|
Tear resistance index, mNm2/g |
MD |
ISO 1974 (GOST 13525.3) |
13 | 13 | 13 | 14 |
| CD | 13 | 13 | 13 | 14 | ||
|
Water absorption (Cobb method), g/m2 |
WS |
ISO 535 (GOST 12605) |
32 | 32 | 32 | 32 |
|
Air resistance (Gurley method), s |
ISO 5636-5 | 25 | 25 | 25 | 25 | |
|
Moisture, % |
ISO 287 (GOST 13525.19) |
7,5 |
||||
The paper is used for the production of paper bags suitable for carrying construction materials (primarily, cement) and for dry mortars.
|
Properties |
Testing method |
SKI-70 | SKI-80 | SKI-90 | SKI-100 | |
|---|---|---|---|---|---|---|
|
Grammage, g/m2 |
ISO 536 (GOST 13199) |
70 | 80 | 90 | 100 | |
|
Ultimate tensile strength, kN/m |
MD | ISO 1924-3 | 5,7 | 6,5 | 7,3 | 8,1 |
| CD | 4,3 | 4,9 | 5,5 | 6,1 | ||
|
Tensile index, Nm/g |
MD | 81 | 81 | 81 | 81 | |
| CD | 61 | 61 | 61 | 61 | ||
|
Stretch at break, % |
MD | 6,0 | 6,0 | 6,0 | 6,0 | |
| CD | 7,5 | 7,5 | 7,5 | 7,3 | ||
|
Tensile energy absorption, J/m2 |
MD | 210 | 240 | 270 | 290 | |
| CD | 220 | 250 | 280 | 300 | ||
|
Tensile energy absorption index, J/g |
MD | 3,0 | 3,0 | 3,0 | 2,9 | |
| CD | 3,2 | 3,2 | 3,1 | 3,0 | ||
|
Tear resistance index, mNm2/g |
MD |
ISO 1974 (GOST 13525.3) |
13 | 13 | 13 | 14 |
| CD | 14 | 14 | 14 | 14 | ||
|
Water absorption (Cobb method), g/m2 |
WS |
ISO 535 (GOST 12605) |
32 | 32 | 32 | 32 |
|
Air resistance (Gurley method), s |
ISO 5636-5 | 18 | 18 | 18 | 18 | |
|
Moisture, % |
ISO 535 (GOST 12605) |
7,5 |
||||
Extensible sack paper SKI
Extensible, as well as semi-extensible, paper is used for the manufacture of construction material bags. Their enhanced endurance (ultimate tensile strength and tensile index) makes it possible to reduce the number of paper layers to 2 or 3 from 4 or 5 without any quality loss.
|
Properties |
Testing method |
SKI-70 | SKI-80 | SKI-90 | SKI-100 | |
|---|---|---|---|---|---|---|
|
Grammage, g/m2 |
ISO 536 (GOST 13199) |
70 | 80 | 90 | 100 | |
|
Ultimate tensile strength, kN/m |
MD | ISO 1924-3 | 6,0 | 6,9 | 7,7 | 8,6 |
| CD | 4,8 | 5,5 | 6,2 | 6,9 | ||
|
Tensile index, Nm/g |
MD | 86 | 86 | 86 | 86 | |
| CD | 69 | 69 | 69 | 69 | ||
|
Stretch at break, % |
MD | 7,0 | 7,0 | 7,0 | 7,0 | |
| CD | 8,0 | 8,0 | 8,0 | 7,8 | ||
|
Tensile energy absorption, J/m2 |
MD | 230 | 260 | 295 | 320 | |
| CD | 240 | 270 | 305 | 330 | ||
|
Tensile energy absorption index, J/g |
MD | 3,3 | 3,3 | 3,3 | 3,2 | |
| CD | 3,4 | 3,4 | 3,4 | 3,3 | ||
|
Tear resistance index, mNm2/g |
MD |
ISO 1974 (GOST 13525.3) |
13 | 14 | 14 | 15 |
| CD | 14 | 15 | 15 | 15 | ||
|
Water absorption (Cobb method), g/m2 |
WS |
ISO 535 (GOST 12605) |
32 | 32 | 32 | 32 |
|
Air resistance (Gurley method), s |
ISO 5636-5 | 18 | 18 | 18 | 18 | |
|
Moisture, % |
ISO 287 (GOST 13525.19) |
7,5 |
||||
The use of high-porosity extensible paper makes it possible to:
- Manufacture paper bags with less paper layers;
- Reduce the package weight;
- Obtain a strong bag;
- Enhance the overall bag and working place cleanliness;
- Increase the bag filling velocity;
- Decrease the number of torn bags;
- Provide for precise filling of the bags;
- Increase the efficiency of palletizing and warehouse storage;
- Facilitate loading and transportation.
|
Properties |
Testing method |
SKI-70 | SKI-80 | SKI-90 | SKI-100 | |
|---|---|---|---|---|---|---|
|
Grammage, g/m2 |
ISO 536 (GOST 13199) |
70 | 75 | 80 | 90 | |
|
Ultimate tensile strength, kN/m |
MD | ISO 1924-3 | 5,3 | 5,6 | 6,0 | 6,8 |
| CD | 4,5 | 4,8 | 5,1 | 5,8 | ||
|
Tensile index, Nm/g |
MD | 75 | 75 | 75 | 75 | |
| CD | 64 | 64 | 64 | 64 | ||
|
Stretch at break, % |
MD | 7,0 | 7,0 | 7,0 | 7,0 | |
| CD | 7,5 | 7,5 | 7,5 | 7,4 | ||
|
Tensile energy absorption, J/m2 |
MD | 230 | 245 | 260 | 300 | |
| CD | 230 | 245 | 260 | 300 | ||
|
Tensile energy absorption index, J/g |
MD | 3,3 | 3,3 | 3,3 | 3,3 | |
| CD | 3,3 | 3,3 | 3,3 | 3,3 | ||
|
Tear resistance index, mNm2/g |
MD |
ISO 1974 (GOST 13525.3) |
13 | 14 | 14 | 14 |
| CD | 14 | 15 | 15 | 15 | ||
|
Water absorption (Cobb method), g/m2 |
WS |
ISO 535 (GOST 12605) |
32 | 32 | 32 | 32 |
|
Air resistance (Gurley method), s |
ISO 5636-5 | 6 | 6 | 6 | 6 | |
|
Moisture, % |
ISO 287 (GOST 13525.19) |
7,5 |
||||
Modernization of cement plants tightens the customers’ requirements towards filling equipment. As a rule, these are state-of-the-art carousel type filling tools outfitted with up to ten nozzles feeding the construction materials to paper bags.
Filling a paper bag with 50 kg cement takes up to 4 seconds. Such high-tech industry requires high-porosity paper wrappers. It is the high air permeability that allows the bags made of mere 2 or 3 paper layers to hold as much as fifty kilograms of cement.
|
Properties |
Testing method |
SKI-70 | SKI-80 | SKI-90 | SKI-100 | |
|---|---|---|---|---|---|---|
|
Grammage, g/m2 |
ISO 536 (GOST 13199) |
70 | 80 | 90 | 100 | |
|
Ultimate tensile strength, kN/m |
MD | ISO 1924-3 | 5,6 | 6,4 | 7,2 | 8,0 |
| CD | 4,2 | 4,8 | 5,4 | 6,0 | ||
|
Tensile index, Nm/g |
MD | 80 | 80 | 80 | 80 | |
| CD | 60 | 60 | 60 | 60 | ||
|
Stretch at break, % |
MD | 6,0 | 6,0 | 6,0 | 6,0 | |
| CD | 7,3 | 7,3 | 7,3 | 7,3 | ||
|
Tensile energy absorption, J/m2 |
MD | 200 | 230 | 250 | 270 | |
| CD | 210 | 240 | 260 | 280 | ||
|
Tensile energy absorption index, J/g |
MD | 2,9 | 2,9 | 2,8 | 2,7 | |
| CD | 3,0 | 3,0 | 2,9 | 2,8 | ||
|
Tear resistance index, mNm2/g |
MD |
ISO 1974 (GOST 13525.3) |
13 | 13 | 13 | 14 |
| CD |
|
14 | 14 | 14 | 14 | |
|
Water absorption (Cobb method), g/m2 |
WS |
ISO 535 (GOST 12605) |
32 | 32 | 32 | 32 |
|
Air resistance (Gurley method), s |
ISO 5636-5 | 6,0 | 6,0 | 6,0 | 6,0 | |
|
Moisture, % |
GOST 13525.19 (ISO 287) |
7,5 |
||||
- Sack paper is ideal for manufacturing of industrial bags for cement, dry mortars and other products answering to strict tensile strength standards.
- The use of high-porosity papers provides for good air permeability of the bag and does not require any additional perforation. This means, primarily, that the manufacturing of the bags themselves will require one operation less, and secondarily that the environmental burden pertaining to the loading and unloading of such bags will decrease.
- Paper porosity allows for “breathing” of the product and preserves its quality under fluctuating temperature and humidity conditions.
- The paper’s enhanced durability and air permeability is especially important for valve bags, because such bag has to retain its durability and to be sufficiently hard to hold the contents, at the same time letting air out.
Sales Department:
Telephone numbers: +7 (499) 962 82 00, ext. 10505, 10502, 10504; +7 (81431) 34010; +7 (81431) 34018
Moscow office address: 18/9 Andropov Prospekt, 115432, Moscow (Technopark Metro Station, Dekart Business Centre)
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