Substrate for materials for recording information

FIELD: chemistry.

SUBSTANCE: substrate has a paper base containing cellulose fibre from deciduous wood with particle size smaller than 200 mcm after grinding in amount of not more than 45 wt % and average fibre length between 0.4 and 0.8 mm and filler in amount of 5-40 wt %, particularly 10-25 wt % in terms of the weight of cellulose.The substrate at least contains one polymer layer lying at least on one side of the paper base. There is a layer with a binding agent between the polymer layer and the paper base. The binding agent is a hydrophilic film-forming polymer made from hydroxypropylated starch and/or thermally modified starch. This layer may contain a pigment in form of calcium carbonate, kaolin, talc, titanium dioxide and/or barium sulphate.

EFFECT: reduced limpness and obtaining pure-bred production wastes.

27 cl, 3 tbl

 

The invention relates to a substrate for materials for information recording, as well as its use as a substrate for photographic materials as substrates for digital recording media, such as in the method of inkjet printing (ink-jet), the method of sublimation printing with thermal transfer and method of color laser printing.

For photographic materials for recording information used matte paper with a polymer coating (substrate), which had to meet strict requirements regarding the surface properties and photochemical stability characteristics.

These matte paper-based polymer coating usually consists of glued paper base, which is mostly covered on both sides with polyolefin applied using extrusion. When extrusion coating on the paper depending on the speed of the coating on the polymer surface point defects occur in the form of pock marks, so-called microcrater (pitting). At high rotation speeds of the cooling cylinder, air bubbles trapped in small cavities on the surface of the cooling cylinder, not volatilize before contact with hot polymer, so that the remaining air escapes only after coating, leaving that is Ichnya indentations on the surface of the polymer. These surface defects adversely affect the surface properties required for the substrate material and are critical to image quality, such as gloss and smoothness. Although the improvement of the surface characteristics can be achieved by increasing the number of deposited polymer, this measure is not sufficient at high speed extrusion and also associated with a higher cost of the material. For printing on the surface yet are decisive not only point defects (pitting), but the properties of the paper substrate, such as surface roughness/smoothness and structure of the paper (fiber).

Patent EP 0952483 B1 describes a photographic substrate and proposes to apply to the paper substrate coating layer containing kaolin, and the amount of the kaolin should not exceed 3,3 g/m2. In addition, it is required that the upper side of the pigmented epithelial layer had an average roughness Ra at the level of 1.0 μm or less. Probably in excess of these values have problems with adhesion in relation to the polyolefin coating on the pigment coating layer.

Uniform surface of the substrate is important not only for photographic materials for recording information. To obtain an image similar to the pictures, prisposoblenii photographically materials for recording information, for example paper for inkjet printers, used paper coated with a polyolefin. Heterogeneous or having defects in the surface of the substrate reduces the quality of printed images.

The surface of the paper can also be improved by adding inorganic filler in the pulp suspension, as emptiness inside of nonwoven material are filled with the filler particles, which leads to an improvement in the smoothness of paper and increases the opacity. But at the same time the introduction of fillers in paper weight leads to a reduction in strength and stiffness of the paper. These derating limit the use of fillers. There are restrictions on the choice of filler, because the variety of fillers may affect the photographic material or to have undesirable consequences for the development process. So, for example, calcium carbonate is prone to leaching and precipitation in the form of calcium salts in the developer solution.

In the patent EP 1146390 A1 improves the retention of the filler by sealing paper to density values from 1.05 to 1.20 g/cm3.

In the patent JP 2004-149952 as the substrate material used in the paper with filler, equipped with a pigmented coating based on latex. Used in top layer of latex is an acrylic latex, prigoda the output for dispersion in water.

The objective of the invention is to provide substrates for materials for information recording, the surface of which has a sufficiently high smoothness, so that after printing the image, the image quality is not deteriorated due to the negative surface properties of the substrate. In particular, when a material saving can be achieved not only a good surface, but sufficient rigidity and strength. Finally, it is desirable to obtain a paper basis so that waste could be reused without difficulty when the overlap of the paper pulp on the grid paper machine, without the need for still expensive pre-treatment of waste products.

This problem is solved by using the substrate for a data recording layers on a paper basis, which contains pulp from hardwood with the content of the fibrous material finer than 200 μm, after grinding, not more than 45 weight percent, and an average fiber length of 0.4 to 0.8 mm, and has a filler content of 5 to 40 weight percent, in particular from 10 to 25 weight percent, based on the weight of cellulose.

A further aim of the invention is the substrate for the layers to capture paper-based and at least one polymer layer located at least on one article which side of the paper base, moreover, the paper base contains pulp from hardwood with a share of fibrous material finer than 200 μm, after grinding, not more than 45 weight percent and an average fiber length of 0.4 to 0.8 mm, and has a filler content of 5 to 40 weight percent, in particular from 10 to 25 weight percent.

In a further embodiment of the invention the task is solved with the substrate for the layers to capture paper-based and at least one containing the binder layer located at least on one side of the paper base, and the paper base contains pulp from hardwood with a share of fibrous material finer than 200 μm, after grinding, not more than 45 weight percent and an average fiber length of 0.4 to 0.8 mm, and has a filler content of 5 to 40 weight percent, in particular from 10 to 25 weight percent.

Finally, the problem is solved by using the substrate for a data recording layers with a paper base, at least one containing the binder layer, and the layer is located on the front side of the paper base, and formed on the layer of the polymer layer and the paper base contains pulp from hardwood with a share of fibrous material finer than 200 μm, after grinding, not more than 45 weight percent, and the average dline the fibers from 0.4 to 0.8 mm, and has a filler content of 5 to 40 weight percent, in particular from 10 to 25 weight percent, based on the weight of cellulose, and the layer contains a hydrophilic film-forming binder.

For the purposes of the invention, the term "paper-based" understanding of the paper without coating or glued to the surface. In addition to the cellulosic fibers of the paper base may include adhesive means, such as the dimers of alkylbetaine, aliphatic acids and/or salts of aliphatic acids, epoxydecane amides of aliphatic acid, anhydride of succinic acid with alkenylamine or alkyl groups, means for increasing the strength in the wet state, such as polyamine-polyamide-epichlorohydrin, means for increasing the strength in the dry state, such as anionic, cationic or amphoteric polyamides, optical brighteners, pigments, dyes, defoaming means and other known in the paper industry AIDS. The paper base may be glued to the surface. Suitable for this purpose sizing tools are, for example, polyvinyl alcohol or oxidized starch. The paper base may be made on clinocerinae or kruglosutochno paper machine ("Yankees", cylinder paper machine). Unit weight surface the displacement of the paper base may vary from 50 to 250 g/m 2in particular from 80 to 180 g/m2. The paper base may be used in loose or compacted form (polished). Particularly well suited are the paper base, having a density of from 0.8 to 1.05 g/cm3especially from 0.95 to 1.02 g/cm3.

After grinding, the pulp has a content of fines (less than 200 microns) from 0 to 35% by weight, preferably from 10 to 35% by weight.

Cellulose according to the invention has a content of fine material (<100 μm) before chopping not more than 15 weight percent, in particular from 2 to 10 weight percent relative to the weight of cellulose. The average length of the fibers of untreated cellulose ranges from 0.6 to 0.85 mm (measured according to the method of the firm Kajaani). Next, the pulp has a lignin content of less than 0.05 weight%, particularly from 0.01 to 0.03 weight percent relative to the weight of cellulose.

Cellulose according to the invention preferably is a eucalyptus pulp, with the content of the fibrous material finer than 200 μm after grinding from 10 to 35 weight percent, and the average length of the fibers is from 0.5 to 0.75 mm

It was shown that the use of cellulose, having a limited content of the fibers is smaller than 200 μm, reduces the loss of rigidity caused by the introduction of the filler. Usually applied cellulose d is avecina hardwood varieties NBHK (Northern Bleached Hardwood Kraft Pulp, Northern bleached hardwood Kraft pulp) differs by at least 10-20% by weight of a high content of fine fractions. For example, the content of fibrous material finer than 200 μm after grinding in maple cellulose comprises about 60 weight percent, based on the weight of cellulose. The lignin content in the pulp is of 0.18 weight percent, based on the weight of cellulose.

As a filler in paper can be applied, for example, kaolin, calcium carbonate in its natural form such as limestone, marble or dolomite stone, precipitated calcium carbonate, calcium sulfate, barium sulfate, titanium dioxide, talc, silicon oxide, aluminum oxide and mixtures thereof. Particularly suitable calcium carbonate with a particle size distribution comprising at least 60% of particles smaller than 2 μm and not more than 40% of the particles smaller than 1 μm. In a particularly preferred embodiment of the invention is used calcareous spar with granulometric composition comprising about 25% of particles with particle sizes less than 1 μm, and about 85% of the particles, the particle size of which is less than 2 μm. According to a further variant embodiment of the invention can be applied calcium carbonate with a particle size distribution comprising at least 70%, the advantage is but at least 80% of the particles, smaller than 2 μm and not more than 70% of particles smaller than 1 micron.

Polymer layer located at least on one side of the paper base may predominantly contain thermoplastic polymer. Particularly suitable for this are the polyolefins such as low density polyethylene (LDPE), high density polyethylene (HDPE), ethylene-α-olefin copolymer (LLDPE), polypropylene, and mixtures thereof.

The polymer layer may contain a white pigment such as titanium dioxide, and other excipients, such as an optical Brightener, a dye and a dispersant. The weight per unit area of the polymer layer can be from 5 to 50 g/m2in particular from 10 to 30 g/m2or, according to a further preferred variant implementation, from 10 to 20 g/m2. The polymer layer can be extruded as a single coating or coextrusion as multi-layer coating. Extrusion coating can be performed when the plant capacity to 600 m/min

In one preferred variant of the invention, the reverse side of the paper base may be covered with a transparent, i.e. not containing pigment of the polyolefin, in particular polyethylene. The weight per unit area of the polymer layer can be from 5 to 50 g/m2in particular from 10 to 40 g/m2 or, according to a further preferred embodiment, from 10 to 20 g/m2.

The reverse side of the substrate may also contain other functional layers such as antistatic or protivoukachiwauschee layers.

In one further embodiment of the invention the polymeric layer can be a polymer film or a biaxially oriented polymer film. Particularly well suitable are polyethylene or polypropylene film with a porous core layer and at least one non-porous or non-pigmented containing white pigment surface layer located at least on one side of the core layer. The polymeric film may be applied to the paper base by lamination using an extrusion process, and can be applied to the clutch, for example polyethylene.

In one further embodiment of the invention between paper-based and polymer layer may be there is another layer which contains a hydrophilic binder. Particularly well suited for this are film-forming starches, such as thermally modified starches, in particular corn starch or hydroxypropylamino starches. In a preferred embodiment, ispolzuyteskryty apply starch solutions with low viscosity, moreover, the values of viscosity on Brookfield range from 50 to 600 MPa·s (25%solution at a temperature of 50°C and a rotation speed of the spindle at 100 rpm, in particular from 100 to 400 MPa·s, mostly from 200 to 300 MPa·s Viscosity Brookfield measured according to ISO 2555. Mainly the binder does not contain synthetic latex. Due to the absence of synthetic binders becomes possible re-use of waste materials without pre-processing.

The layer containing a hydrophilic binder, mainly may contain other polymers, such as polyamide copolymers and/or polyvinylidene copolymers. The polymer can be applied in an amount of from 0.4 to 5 weight percent, based on the weight of the pigment. According to a preferred variant of implementation, the amount of this polymer is from 0.5 to 1.5 weight percent.

The layer containing a hydrophilic binder may be directly deposited on the front side of the paper base or on the reverse side of the paper base. It can be applied to the paper base as a single layer or multilayer coating. The coating weight can be applied by all conventional in paper production device for coating during the manufacturing process or in the Department who enoy operations and the number is chosen so that after drying a layer weight per unit area was not more than 20 g/m2in particular from 8 to 17 g/m2or, according to a particularly preferred embodiment, from 2 to 6 g/m2.

The layer can mainly contain pigment. The pigment may be selected from the group consisting of oxides, silicates, carbonates, sulfides and sulfates of metals. Particularly well suited are those pigments such as kaolin, talc, calcium carbonate and/or barium sulfate. Particularly preferred is a pigment with a narrow particle size distribution in which at least 70% of the pigment particles have a size less than 1 μm. In order to achieve the effect according to the invention, the proportion of pigment with a narrow particle size distribution in the total amount of pigment should be at least 5 percent by weight, in particular from 10 to 90 weight percent. Especially good results can be achieved by a content of from 30 to 80 weight percent of the total number of pigment.

The term "pigment with a narrow particle size distribution" according to the invention are also pigments with a particle size distribution wherein at least 70 weight percent of the pigment particles have a size less than 1 μm, and at a content of 40 to 80% by weight of these is the pigment particles, the difference between the pigment with the largest particle size (diameter) and the pigment with the smallest particle size of less than about 0.4 microns. As a particularly preferred turned out to be calcium carbonate with a value of d50%about 0.7 microns.

In one particular embodiment of the invention was used, a mixture of pigments, which consisted of the aforementioned calcium carbonate and kaolin. The quantitative ratio of the calcium carbonate/kaolin is preferably from 30:70 to 70:30. Unexpectedly, it was found that, despite the high share prone to yellowing kaolin, was observed only slight negative impact on the whiteness of coated material.

The quantitative ratio of the binder/pigment in the layer may be from 0.1 to 2.5, mainly from 0.2 to 1.5, particularly still from 0.9 to 1.3.

The content of solids in the coating mass according to the invention can be from 15 to 35 weight percent, based on the weight of the top mass.

It is implied that these starches on the surface of the paper base to form a continuous film. This film prevents the accumulation of pigment particles of the coating mass in the recesses on the surface of the paper. The binder and the pigment thus remain on the surface of the paper base. Because of this, fewer pigment to achieve the desired level of smoothness of paper. This binder contributes to making pigmented paper could be utiliz is by again using commonly used method of dissolving pulp without stains as pure varieties of waste products could be used in the production cycle of the paper machine.

Depending on the desired application corresponding to the invention the substrate can be applied to other functional layers such as emulsion layers with salts of silver for photographic materials information recording layers for recording data for a method of inkjet printing or layers for printing other visual means, such as a printing method thermal fixation of the dye (dye-sublimation printing technology with thermal) or method of color laser printing.

The following examples should explain the invention in more detail.

Examples

Getting a paper base

To obtain a paper base used eucalyptus pulp fiber substances smaller than 200 μm (after grinding, the degree of grinding 35-38° SR (Schoper regular, SHR)) 30 weight percent, based on the total amount of cellulose. For grinding grinded pulp as about 5%aqueous suspension (slurry) using a disk mill for the degree of grinding of the mass from 35 to 38° SR. The concentration of the cellulose fibers in the thin suspension was 1 weight percent, based on the suspension of cellulose. In a thin slurry made additives such as a dimer of alkylbetaine as a neutral sizing tools (AKD), polyamine-polyamide-epichlorhydrin resin as a means for improving the strength in the wet state (Kymene ®and natural caso3(Hydrocarb®60-BG).

Further applicable paper base according to the invention are obtained using as filler Hydrocarb®90 IU and Hydrocarb®BUT IU above described method.

A thin slurry, the pH of which was adjusted to values of from about 7 to 7.8, caused by flooding on the grid paper machine, and was then molded sheet while removing water from the cloth on the mesh part of the conveyor of the paper machine. The pressing part was made further dehydration paper cloth to moisture content from 58 to 72 percent by weight, based on the weight of the cloth. Further drying was carried out in the dryer section of paper machine heated drying cylinders. Further details are presented in Table 1.

Getting top mass

On base paper having a weight per unit area of about 160 g/m2and the humidity is around 7%, caused the following top mass, more details are listed in Table 2. The coating was performed using a size press.

In coating weight used the following binders:

Starch I: C-Film 05731 (company Cerestar): Hydroxypropyltrimonium corn starch with a viscosity of 600 MPa·s, measured at a temperature of 50°C at a rotation speed of a spindle No. 2 100 the b/min in a solution with a solids content of 25 weight percent.

Starch II: C-Film 07302 (company Cerestar): thermally modified starch with a viscosity of 234 MPa·s, measured at a temperature of 50°C at a rotation speed of a spindle No. 2 at 100 rpm in a solution with a solids content of 25 weight percent.

The pigments used in coating weight, were:

Caso3with 85% of the pigment particle size <1 μm (Covercarb®85-ME, the firm OMYA)

Kaolin with a 65% pigment <1 μm (Lithoprint®EM, the firm OMYA)

Comparative example

To obtain a paper base instead of eucalyptus pulp used short sulphate pulp, which was a mixture of different grades of pulp from hardwood, such as maple, birch, poplar and ash (NBHK). The content of fibrous material finer than 200 μm after grinding was 60 weight percent, based on the weight of cellulose. The paper base was obtained with filler and without, and was also covered with pigmented epithelial layer.

Other details are given in Table 1.

The paper obtained according to Examples B1 to B5 and Comparative examples V1 to V3 were covered on the front side with a mixture of polymers of 71 weight percent low density polyethylene (LDPE, 0,923 g/cm3), 16 weight percent masterbatches of TiO2(50 weight percent LDPE and 50 scales the x percent of TiO 2) and 13% by weight of other additives, such as optical bleach, calcium stearate, and blue pigment, at different scales of the layer per unit area of 40 g/m230 g/m2, 20 g/m2). The reverse side of the paper covered not containing a pigment, a polymer blend of 40 weight percent low density polyethylene (LDPE, d=0,923 g/m2) and 60 weight percent of high density polyethylene (HDPE, d=0,964 g/cm3). The coating was performed at speeds of extrusion from 250 to 350 m/min

The test substrates obtained according to Examples and Comparative examples

Stiffness

Values of hardness were determined using the analyzer stiffness in bending SCAN-P 29.69 according to DIN 53121 tape sample with a width of 38 mm, clamping length of the test sample 10 mm and the bending angle of 15°. Values are given in units of mn/10 mm

Opacity

Measurements were carried out using the measuring device Zeiss-Elrepho according to DIN 53146 on samples of size 80×80 mm, the Evaluation was performed according to the relation Rs/R8100 (%). Rsmeans of diffuse reflection on a black background, and R8means of diffuse reflection in the foot.

Resistance to delamination

The measurements were performed with the analyzer resistance to delamination Internal Bond Impact Tester according to the instructions TAPPI RC 308. the values given in j/m 2.

Surface

The test is used for objective evaluation of the surfaces of the paper using the imaging system and is a means of internal control. The tests were carried out on tapes of a width of about 20 cm, taken across the width of the roll, which was air-conditioned for at least 30 minutes at a temperature of 23°C and 50%relative humidity. The evaluation was performed according to a scale of values from 100 (excellent) to 1500 (bad).

Wt.%
Table 1
Property/ ExampleA single-unitB1B2B3B4B5V1V2V3V4
The paper base
C is llulose Avca-liptAvca-liptAvca-liptAvca-liptAvca-liptNorthern bleached hardwood Kraft (NBHK)Northern bleached hardwood Kraft (NBHK)Northern bleached hardwood Kraft (NBHK)Northern bleached hardwood Kraft (NBHK)
Pulp
StarchWt.%0,570,570,570,570,570,560,570,570,57
Thin suspension
A sizing agent (AKD)Wt.%0,480,240,400,240,240,240,480,480,48
Means for increasing strength in a wet SOS-being (Kymene)Wt.%0,360,360,360,360,360,360,360,360,36
BleachWt.%0,060,060,060,060,060,060,060,060,06
Filler10,0010,0013,5015,7019,0015,00-15,00-
The pH of the thin suspension7,57,67,67,87,77,77,07,77,0
The degree of grinding/ Pulp° SR363738373533333333
Fiber lengthmm0,640,640,640,640,640,540,540,540,54
The weight per unit areag/m2160160160160160160160160160
Densityg/cm31,021,021,021,021,021,041,040,950,95

Table 2
Property/ ExampleB1B2B3B4B5V1V2V3V4
The binder
Starch I%-90,5--
Starch II%90,547,047,0--47,047,0
Pigment:
CaCO3% 26,426,4--26,426,4
Kaolin%26,426,4--26,426,4
Polymer additive%
Acroflex®VX 610%-0,50,50,20,2-0,20,2
Top weight
The solids content%22,021,021,021,0--21,0a 21.5
PH-8,08,08,08,1--8,18,0
ViscosityMPa·s-505050,050--5050
The layer weight per unit areag/m2- 6,06,06,56,0--106,0

Table 3
Property/ ExampleB1B2B3B4B5V1V2V3V4
The stiffness along the232,7253,17242,20235,9190,78215,20262,14222,30282,64
Rigidity across106,7123,40108,99106,1299.91 per103,30115,29106,7011,29
Resistance to delamination170182175165155160243168261
Opacity90,090,0to 91.192,893,790,489,393,594
Surface551535510480470520510460470

1. The substrate for data recording layers, comprising base paper containing pulp from hardwood, with the content of the fibrous material finer than 200 μm after grinding is less than 45% and an average fiber length of 0.4 to 0.8 mm and the content of the filler is from 5 to 40%, in particular from 10 to 25% relative to the weight of cellulose.

2. The substrate according to claim 1, in which the Oh of at least one layer of synthetic resin is at least on one side of the paper base.

3. The substrate according to claim 1, in which at least one layer containing the binder is at least on one side of the paper base.

4. The substrate according to claim 1, in which the content of fibrous material finer than 200 μm after grinding, is from 10 to 35 wt.%.

5. The substrate according to claim 1, in which cellulose is a eucalyptus pulp.

6. The substrate according to claim 5, in which eucalyptus pulp contains a proportion of fibrous material finer than 200 μm after grinding from 10 to 35% relative to the weight of cellulose, and has a fiber length of 0.5 to 0.75 mm

7. The substrate according to claim 1, in which the paper base has a filler content of 10 to 25% based on the weight of cellulose.

8. The substrate according to claim 7, in which the filler is a calcium carbonate, titanium dioxide, talc and/or clay.

9. The substrate according to claim 2, in which the layer of synthetic resin contains a thermoplastic polymer.

10. The substrate according to claim 9, in which thermoplastic polymer is a low density polyethylene (LDPE), high density polyethylene (HDPE), ethylene-α-olefin copolymer (LLDPE) and/or polypropylene.

11. The substrate according to claim 2, in which the layer of synthetic resin is a biaxially oriented polyolefin film.

12. The substrate according to claim 2, in which the weight per unit area of the layer of synthetic resin on the front side of the e is from 5 to 50 g/m 2in particular from 10 to 30 g/m2.

13. The substrate according to claim 2, in which the weight per unit area of the layer of synthetic polymer on the reverse side is from 5 to 50 g/m2in particular from 10 to 40 g/m2.

14. The substrate according to claim 2, in which the layer containing the binder is located between the paper base and a layer of synthetic resin.

15. The substrate on 14, in which the binder is a hydrophilic film-forming polymer.

16. The substrate on 14, in which the binder is hydroxypropyltrimonium starch and/or thermally modified starch.

17. The substrate on 14, in which the hydrophilic binder include starch having a viscosity Brookfield from 50 to 600 MPa·s, in particular from 100 to 400 MPa·s, preferably from 200 to 300 MPa·s, measured at 25%solution at a temperature of 50°C and a rotation speed of the spindle 100 rpm

18. The substrate on 14 in which the layer contains a pigment with a narrow particle size distribution in which at least 70% of the pigment particles have a diameter less than 1 micron.

19. The substrate on p, in which the pigment is a calcium carbonate, kaolin, talc, titanium dioxide and/or barium sulfate.

20. The substrate on p, in which the quantitative ratio of the binder/pigment is from 0.1 to 1.5, preferably from 0.9 1,3.

21. The substrate on 14, in which the weight per unit area of the layer containing the binder is not more than 20 g/m2preferably from 2 to 6 g/m2.

22. The substrate on 14 in which the layer containing the binder is located on the front and/or back side of the paper base.

23. The substrate according to claim 3, in which the binder is a hydrophilic film-forming polymer.

24. The substrate according to claim 3, in which the binder is hydroxypropyltrimonium starch and/or thermally modified starch.

25. The substrate according to claim 3, in which the hydrophilic binder include starch having a viscosity Brookfield from 50 to 600 MPa·s, in particular from 100 to 400 MPa·s, preferably from 200 to 300 MPa·s, measured at 25%solution at a temperature of 50°C and a rotation speed of the spindle 100 rpm

26. The substrate according to claim 3, in which the layer contains a pigment with a narrow particle size distribution in which at least 70% of the pigment particles have a diameter less than 1 micron.

27. The substrate on p, in which the quantitative ratio of the binder/pigment is from 0.1 to 1.5, preferably from 0.9 to 1.3.



 

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SUBSTANCE: invention relates to production of flooring boards with decorative surface and high wear resistance coats. Proposed method comprises the following jobs: a) making board (1) with decorative surface consisting of wood material; b) applying thermoset base layer (2); c) applying wear-resistant particles (3) of aluminium oxide and/or emery on damp base layer; d) applying cover layer (8) on wear-resistant particles (3) and still damp base layer; e) curing of both said layers (2, 8). Aforesaid layers are acrylate coats based on polyurethane or aliphatic polyester.

EFFECT: higher wear resistance.

17 cl, 1 dwg

FIELD: paper industry.

SUBSTANCE: cardboard contains at least two layers: the first layer made of raw materials having high density and high module of elasticity; and the second layer to provide voluminousness for cardboard, in which the second layer contains chemical-thermomechanical pulp (CTMP) of broadleaf wood, cellulose and/or CTMP of coniferous wood at the specified ratio of components. At the same time coherence by Scott is achieved, making at least 80 J/m2; index of bending resistance making at least 5 Nm6/kg3 and strength in direction z, making at least 200 kPa. Invention also relates to products made of cardboard.

EFFECT: expansion of multilayer cardboard range and improvement of its quality.

15 cl, 8 tbl

FIELD: paper industry.

SUBSTANCE: cardboard contains at least two layers: the first layer made of raw materials having high density and high module of elasticity; and the second layer to provide voluminousness for cardboard, in which the second layer contains chemical-thermomechanical pulp (CTMP) of broadleaf wood, cellulose and/or CTMP of coniferous wood at the specified ratio of components. At the same time coherence by Scott is achieved, making at least 80 J/m2; index of bending resistance making at least 5 Nm6/kg3 and strength in direction z, making at least 200 kPa. Invention also relates to products made of cardboard.

EFFECT: expansion of multilayer cardboard range and improvement of its quality.

15 cl, 8 tbl

FIELD: machine building.

SUBSTANCE: invention refers to test medium for express-analysis of motor oils in internal combustion engines. Medium has density from 50.0 to 200.0 g/m2 and in terms per total weight of test medium contains from 70.0 to 98.0% of weight of cotton pulp, from 0.0 to 25.0% of weight of cellulose and from 0.5 to 30.0% of weight of silicon acid and/or at least silicate salt. Another invention refers to method for express-analysis of motor oils in internal combustion engines whereat researched drop of motor oil is applied on and penetrates into test medium disclosed in this invention. Further, for evaluation of engine condition results of the test are compared mainly with at least one reference pattern. Also here is disclosed the method for express-analysis of actual state of internal combustion engine utilising the above described test medium.

EFFECT: simplicity, quickness and reliability of analysis.

20 cl

FIELD: process engineering.

SUBSTANCE: this invention relates to method of processing initial sheet material containing natural organic fibers or reclaimed fibers. In compliance with proposed method, one side of said material is first processed by liquid containing said antimicrobial agent and binder and initial stock is dried. Second step comprises applying wax-containing layer on processed side of initial material for it to be impregnated at 100-145°C.

EFFECT: higher resistance to ozone and UV radiation.

18 cl, 2 dwg

FIELD: medicine.

SUBSTANCE: absorbing personal care item represents diaper, tissue or towel. Said personal care item contains at least one upper sheet layer, permeable for liquid, at least one lower sheet layer, impermeable for liquid, and at least one absorbing intermediate layer between at least one upper sheet layer and at least one lower sheet layer. At least one absorbing layer contains bleached modified chemical or semi-chemical cellulose and quantity of hemi cellulose, contained in modified cellulose, constitutes approximately 4-16% of dry mass of modified cellulose.

EFFECT: increase of volume of product, its reduced sensitivity to moisture and improved characteristics of hydro expansibility.

11 cl, 2 dwg, 4 tbl, 4 ex

FIELD: paper industry.

SUBSTANCE: paper with improved rigidity and bulk and method of its manufacturing may be used in pulp and paper industry and are intended for photocopier equipment. Paper comprises three-layer double-tee structure that forms a single web. It has central core layer manufactured mainly from cellulose, bulk of which is increased with the help of filler, such as hydrazine salt. Starch-based coating is applied on both sides of core layer, at the same time starch has high content of solid products. Coating forms three-layer paper having composite structure with outer layers of high strength that surround core of low density.

EFFECT: improved strength, rigidity and resistance to twisting of produced material.

32 cl, 2 dwg, 3 tbl, 3 ex

FIELD: printing industry.

SUBSTANCE: material represents a paper web, which contains a plunge-type thread for counterfeit protection. In areas of its emerging there are bulges arranged as a result of thread location over sheet surface, availability of which visually and by the feel helps user to identify quality of bank notes. Protective threads of textile production have been used. Bulges are arranged as a result of thread thickening in areas of its emerging from paper web. Thickened parts of thread are provided with taps in the form of branches or thinner areas for their more reliable adhesion to paper web. Threads are shaped into grid. Thread is embedded into web by fragments, for instance following nominal value of bank notes. Threads are visible symmetrically on both sides of bank note sheet.

EFFECT: improved extent of bank notes protection and easier detection of their authenticity both visually and by the feel, especially for visually impaired people.

6 cl, 4 dwg

FIELD: woodworking industry.

SUBSTANCE: material comprises fibrous base from craft paper with applied impression of desirable printing dye with impregnation by resin or mixture of resins coloured into a desired colour. Impregnation with resin or mixture of resins is carried out prior to application of impression or after application of impression. Fibre base is soaked with application of one or more layer of resin. Resin or mixture of resins is selected from group, which contains phenol, amine, acryl and/or other similar resins. Coating material is produced by method, where resin or mixture of resins is used, and craft paper is used as fibre base. Resin or mixture of resins are coloured using desired dye. Impression is applied onto craft paper, using desirable printing dye, and impregnated, using specified resin or mixture of resins.

EFFECT: improved strength of coating material and high colour resistance to light and temperature.

18 cl, 4 tbl, 2 ex

FIELD: chemistry.

SUBSTANCE: adhesive contains a basic component in form of brewer's or distiller's yeast which is a waste from the brewing or distillation industry. The residue of brewer's or distiller's yeast is treated with 2% sodium hydroxide solution in ratio of 1:1. The adhesive composition contains the treated residue of brewer's yeast, glycerin and boric acid. Components of the composition are in the following ratio, pts. wt: residue of brewer's or distiller's yeast treated with 2% sodium hydroxide solution in ratio of 1:1 96.0-98.0; glycerin 1.9-3.7; boric acid 0.1-0.3.

EFFECT: adhesive composition has high adhesive capacity and low cost.

2 tbl

Paper making method // 2384661

FIELD: textile, paper.

SUBSTANCE: method relates to paper production and can be used in pulp-and-paper industry. Method involves the use of cellulose suspension from cellulose fibres and fillers (optional), dehydration of cellulose suspension on grid or sieve so that a sheet can be formed. Then the sheet is dried. In this method there used is polymeric addition which includes ethylenically unsaturated monomer soluble in water or potentially soluble in water, and ethylenically unsaturated monomer containing a reactive group. The latter represents an epoxy group. The polymeric addition used has molar weight which is less than one million. Polymer is obtained from mixture of monomers, which includes acrylamide and glycidyl methacrylate. Thus, the obtained polymer is used as an addition for increase of paper durability in dry condition, in wet condition, as reagent for internal paper sizing and for surface sizing.

EFFECT: increasing paper durability.

17 cl, 2 tbl, 3 ex

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