Filter medium and method of obtaining filter medium, bag for fractional tea brewing

FIELD: textiles; paper.

SUBSTANCE: filter medium contains one or more layers of fibrous covering and is meant particularly for, making filtering bags or pouches for preparing drinks that are brewed; in this case at least one fibrous covering contains fibres or microcapsules with a material capable of changing its state, in this case their change from the solid state to liquid state takes place in the range of 0-120°C, and the unit weight of the surface of the filtering material is from 8 to 90 g/m2. For example, paraffin hydrocarbons can be used as the material capable of changing its state.

EFFECT: improving quality of the brew.

23 cl, 8 dwg

 

The invention relates to a filter material or filter paper consisting of one or more layers of fibrous coating and intended, in particular, for the manufacture of filter bags or sachets nastennych beverages with improved zlatousove qualities so that the bag, it made of and filled with the extracted substance could in a much shorter time than currently known to bag, to ensure the infusion with intense color and flavor, as well as to a method for producing a filtering material and the bag for batch brewing the tea.

The filter material is made, usually from natural fibres or from a combination of natural and synthetic fibers with the use of special paper machine.

At the initial stage aqueous suspension of fibers is applied to a mostly obliquely installed grid paper machine, and fibrous suspension is directed through the first drying chamber. While on a movable grid is formed first fibrous coating of natural fibers. In the case of manufacturing the filter, heat sealable material of natural and synthetic fibers, the second stage heat sealable sinteticheskoy second water suspension fit with the continuing movement of the grid paper machine on the first floor of the natural fibers and is then put together through an additional drying chamber. With continued movement of the grid paper machine with stacked on top of each other fibrous coating is drying, while synthetic fibers napravljajutsja on the first floor of the natural fibers, resulting in a partial penetration of both coatings each other. The result of the filtering material becomes thermovalve.

Drying can be conducted in a paper machine in the form of contact-drying cylinders or blowing hot air.

After drying, heat sealable or neurosurgery filter material leaves the roll, then cut into dimensional width and in conclusion from it are formed on the filling and packaging machines bags filled chemical substance, such as tea.

When using the filter material as the bag portions for making tea or other packaged extractables you want a fast extraction (maceration).

In addition to packaged tea with a high content of fine particles of tea. However, if the filter material for tea has required large porosity, i.e. contains a certain number of holes, through these pores penetrate fine particles of tea, when using the bags and transporting them is extremely undesirable.

Enabled the industry to overcome this limitation is to the pores to be much smaller and place them with large displacement and frequency, resulting in reduced penetration of tea dust. However, deteriorates tea infusion.

In EP 0656224 A1 describes a filter material for tea, consisting of a main coating and polymer coating obtained by the so-called flapper melt (meltblown). In this known filter material necessary for tea pores are displaced with respect to each other without substantial deterioration of the infusion, thus there is less loss tea dust from a bag.

According to US-A-4289580 filter material is perforated in the paper machine is equipped with water jets for the optimization of tea.

In EP 1229166 A1 disclosed a method in which by using the perforating and/or embossing is a higher filtration capacity of the filter material.

However, for the currently used types of filter paper for tea is characterized by very rapid formation of high concentrations of extractable tea at the interface water - filter paper when a bag for batch brewing tea is a liquid without movement. Such a high concentration (barrier concentration) prevents further extraction of the contents of the bag, because the concentration gradient between the inner the outer sides of the bag without its movement is not restored.

In EP 1215134 A1 describes a filter material, which introduced nabukenya absorbent fibers. Made out bags for batch brewing of tea is no longer required to move in extracting fluid for optimum infusion, the contents of the bag.

The result is the swelling of the fibers is microcavity, regenerating the necessary concentration gradient on the boundary surface of the paper.

But such mikrozavihreniya is that absorbent fibers should have a larger diameter than the diameter of conventional natural and polymeric fibers used in the manufacture of filter material. Therefore, the introduction of absorbent fibers in the filter material and the weave of the fibers between them requires the use of additional chemical and technical support tools.

The present invention is the creation of a filter material that eliminates the above disadvantages of the prior art and provides, in particular, the rapid infusion without penetration of fine particles of tea through the filter material.

This means that the filter material according to the invention are introduced microfiber or microcapsules with a very small size, which because of its composition cause endothermic and ekzotermicheskie microcavity in extracting fluid and thereby provide a very fast diffusion or seasoning.

According to the invention this problem is solved due to the fact that at least one fibrous coating contains fibers or microcapsules with materials capable of phase transition.

A method of obtaining a filter material according to the invention disclosed in article 16 of the claims.

In paragraph 24 of the claims stated sachet for batch brewing tea filter tea bag for batch brewing coffee or the coffee filter according to the invention.

The filter material according to the invention has proved in practice to be able to provide much more rapid infusion or extraction of the contents of the bag without penetration of particles through the filter material. The result is significantly improved zlatousove quality, and, for example, made of this material and filled extractable substance the bag allows you to receive infusion with intense color and flavor within significantly shorter time than when using the known bags.

Fibers, or the fibers or microcapsules according to the invention contained in the filter material, are very small in size, resulting in though and obstructed the passage of filtered particles, but is not limited to the diffusion of the liquid. When this takes place rather education is Noah.

Fibers or microcapsules with a material capable of phase transition, described for example in EP 0611330 B1 and US 2003/0035951 A1. When fibers or microcapsules are intended for use in fabrics and knitted fabrics with improved thermal properties for the manufacture of garments. Garments with such fibers or microcapsules absorb the heat of the body and return it when required. This method is useful is a physical effect, which at the time of the phase transition from solid to liquid, from liquid to gas and Vice versa is allocated and used thermal energy.

It has been unexpectedly found that such fibers or microcapsules with a material capable of phase transition, is introduced into the filtering material, causing more intense sucking or microcavity at the extraction of the content filter. It was found that when this occurs the effect of the Gulf stream or multiple microhollow with very fast extracting effect.

In the case when you want to apply the filter material according to the invention for the preparation of nastennych beverages, it is advisable to use materials capable of transition from a solid phase to a liquid in the range from 0 to 120°C, preferably from 50 to 100°C.

Needless to say, h is about this temperature range should be considered, as the example. In that case, when the filter material according to the invention is used for other purposes, applied materials capable of phase transition, which are characterized by a phase transition in the temperature range corresponding to the filtered material.

As materials capable of phase transition, can be used a variety of materials, such as hydrocarbons, in particular paraffin.

However, in principle, can be applied to many materials. For this you can refer to is described in US 2003/0035951 A1 materials, examples and methods of producing. So US 2003/70035951 A1 and EP 0611330 B1 also contain information disclosing the invention.

As examples of materials capable of phase transition can also be specified: hydrolyzed salts, waxes, oils, fatty acid series, esters of fatty acids series, dibasic acids, dibasic esters, primary alcohols, alcohols with a few atoms of hydrogen clathrates, popularity, stearic anhydrides, efilecabinet, polymers, and mixtures thereof.

Fibers or microcapsules with a material capable of phase transition can be present in an amount of from 1 to 70 wt.%, mainly from 2 to 30 wt.%, preferably from 3 to 10 wt.%, the weight per surface unit of the filter material.

Weight units is less than the surface of the filter material according to the invention can be from 8 to 90 g/cm 2preferably from 10 to 25 g/cm2. The filter material may consist of one or more layers. If there is only one last layer consists mainly of cellulose from softwood and/or fibers "Abaca" and the corresponding number of fibers or microcapsules with a material capable of phase transition. When the multilayer structure, in which the material is thermovalve, the second layer may consist of thermovalve polymer fibers.

In the method according to the invention the fibers or microcapsules with a material capable of phase transition can be made in the first layer is obtained on the paper machine. They can be used in blends with natural fibers. It is also possible to enter the fibers or microcapsules in the paper on the paper machine with a device for applying coatings, such as size press.

Preferred embodiments of the invention shown in the remaining dependent claims and in the exemplary embodiment shown in the drawing.

When this is shown:

figure 1 - device for paper making machines used in the manufacture of filter material according to the invention;

figure 2 is a schematic depiction of the formation of the filter material according to the invention at the initial stage grease the first coating made of natural fibers and a second coating of synthetic, thermovalve fibers;

figure 3 - the second stage, which is a partial weave both fibrous coatings as a result of this dehydration;

figure 4 is another stage at which under the action of the drying synthetic, heat sealable fibers are melted and partially cover the natural fibers;

5 is a cross-section of the microcapsules;

6 is a partial longitudinal section of the microfibre;

7 is a chart of test results in comparison with the prior art;

Fig is another chart with the test results in comparison with the prior art.

For clarity, the method according to the invention more is explained using figures on the example of two-layer filter material.

According to figure 1 two fibrous suspensions a and b of the tanks 3 and 4 are applied in the paper machine at the inlet device 3 for the mass and through the grid 4 paper machine serves for the preparation of paper pulp.

Positions 5, 6 and 7 marked the drying chamber in which water is extracted. Necessary pipe and pumping equipment not shown in detail. Position 8 marked material made from natural and synthetic fibers. Natural fibers and water comes from the tank 1, synthetic fibers and water is added from tank 2.

The material removed from the CE is key paper machine and sent for drying. The position 9 in the three cases is shown schematically drying cylinder, ensuring the drying of the material by the contact method. However, it is also possible to guide the material through the cylinder and dry it in a stream of hot air. After drying the filter material wound into a roll on the roll 10. Then there is the positioning.

In the manufacturing process on a paper machine fibers or microcapsules with a material capable of phase transition can be entered either directly into the tank 1 with natural fibers, or later in a device for coating, for example sizing press.

It is preferable to add a binder, for example polyacrylate (Acronal®), so that the micro-capsules or micro-fibres were glued to the respective fibrous coating.

In figures 2-4 is shown schematically various stages of formation of the filter material according to the invention.

Figure 2 shows the formation of the first coating 11 made of natural fibers and a second coating of synthetic, thermovalve fibers. Additionally injected microcapsules 13A or microfiber 13b with a material capable of phase transition. Microcapsules 13A or microfiber 13b are bonded to the coating 11 made of natural fibers with the use of the binder.

Figure 3 shows fibrous pok is itia 11, 12 with a partial weave.

Figure 4 shows the connection of the cover 11 from natural fibers with a coating 12 of a synthetic, thermovalve fiber drying produced in the next stage. As can be seen from the figures, synthetic, heat sealable fibers 12 partially cover natural fibers 11 and, therefore, microcapsules 13A or microfiber 13b with the material 14, is capable of phase transition.

Figure 5, a greatly enlarged view schematically showing a microcapsule 13A. As is evident from this figure, such a microcapsule contains the protective sheath 15, within which is located the material 14, is capable of phase transition, for example, paraffin hydrocarbons. As a rule, use a mixture of hydrocarbons with different phase transitions that overlap broad temperature range. As a protective shell can be used, for example, the shell of the polyacrylate.

Microcapsules suspended in an aqueous solution of acrylate and using a size press applied in paper machine for non-woven material (see also example 2). I.e. microcapsules do not form their own coverage, and are evenly distributed in a damp paper cloth on coating thickness.

When using staple fibers, i.e. fibers obtained by cutting the infinite plate is n, in the hollow fiber may be atlantarealestate with a certain interval in the form of transverse partitions, so that when cut is not leaking too much material capable of phase transition.

As hollow fibers can be applied to synthetic fibers. Hollow fiber with a material capable of phase transition can be associated with natural fibers 11 are the same or similar manner shown in figures 2-4.

Figure 6, in greatly enlarged view, shows the section of the fiber 13A as a hollow fiber with a longitudinal slit, which is also located inside the material 14, is capable of phase transition. The hollow fiber membrane may consist of a complex of the polyester, polyamide or similar material. Dashed lines show two partitions 16 of atlantarealestate designed to prevent too much leakage 14 capable of phase transition during the formation of staple fibers. For other details you can send to US 2003/0035951 A1.

Examples.

Improvement of tea infusion was confirmed by measurement of the extinction. For this purpose, measurements were made bags for batch brewing tea from material 13 g/m2according to the invention with different number of fibers or microcapsules with a material capable of phase the th transition. These bags were filled with black tea in an amount of about 2 g and placed in a certain amount of boiling water. With the help of a pump formed colored tea was made a circular motion through the photometer. A light beam with a wavelength of 445 nm passed through the pumped liquid. The measured extinction was represented in digital form. Extinction is the extinction of the beam as a result of absorption inside the liquid. The larger the extinction, the darker the tea infusion.

1. In the mixture of fibers for regular, non-heat-sealing paper bags for batch brewing of tea was added 10, 20 and 30% acrylic fibers with microcapsules, inside of which was a material capable of phase transition. The dimensions of the fibers was 2 decitex, 2-5 mm. of these mixtures were made waterproof paper leaves 13 g/m3. From leaflets were produced bags for batch brewing of tea and filled with black tea in the amount of 2.0, By the above-described measurement was determined by the extinction as a function of time brewing. For single experience used raw packet for batch brewing tea. Figure 7 shows the measurement result, which clearly implies that with the increase of the percentage of acrylic fibers with the microcapsules, the color intensity tea notably vozraste is compared with 100% natural fibers.

2. In the initial mixture with the content of 17.4% Acronal®entered 1, 5 and 10 wt.% microcapsules with a material capable of phase transition. Using a squeegee original mix inflicted on terminatively paper 13 g/m2for bags for batch brewing the tea.

Then the material was utverjdali at 120°C for 10 minutes. From the impregnated paper were made bags with two compartments, which are filled in black tea in the amount of 2.0,

As already described in the first experiment, the extinction of the tea bag was measured as a function of the duration of the infusion. For single experience used raw packet for batch brewing the tea.

On Fig shows the results of measurement. Explanations:

Sample 1: single experience;

Sample 2: 1% of microcapsules with a material capable of phase transition;

Sample 3: 5% of microcapsules with a material capable of phase transition;

Sample 4: 10% of the microcapsules with a material capable of phase transition.

From this experience, it results that with the increase in the number of microcapsules with a material capable of phase transition, the intensity of the color of tea growing. Compared with no experience without the use of microcapsules, the color intensity is obtained at a single experience after 4 minutes of infusion is achieved here in two mi is by Uta, i.e. twice as fast.

1. The filter material of one or more layers of a fibrous covering, in particular, for the manufacture of filter bags or pouches for preparing infused beverages, characterized in that at least one fibrous coating (11) contains fibers or microcapsules (13A, 13b) with a material capable of phase transition, and the transition from solid phase to liquid is in the range of 0-120°With a weight per surface unit of filter material is from 8 to 90 g/m2.

2. The filter material according to claim 1, characterized in that it contains materials (14), capable of phase transition, with the transition from solid phase to liquid is in the range of 50-100°C.

3. The filter material according to claim 1 or 2, characterized in that the material (14), capable of phase transition, contains hydrocarbons.

4. The filter material according to claim 3, characterized in that it contains paraffin hydrocarbons.

5. The filter material according to claim 1, characterized in that the material (14), capable of phase transition, provided hydrolyzed salts, waxes, oils, fatty acid series, esters of fatty acids series, dibasic acids and esters, primary alcohols, alcohols with a few atoms of hydrogen clathrates, popularity, stearic ang is tidy, efilecabinet, polymers, and mixtures thereof.

6. The filter material according to claim 1, characterized in that it contains fibers or microcapsules (13A, 13b) in an amount of from 1 to 70% by weight per unit of surface of the filter material.

7. The filter material according to claim 6, characterized in that it contains fibers or microcapsules (13A, 13b) in an amount of from 2 to 30% by weight per unit of surface of the filter material.

8. The filter material of claim 8, characterized in that it contains fibers or microcapsules (13A, 13b) in an amount of from 3 to 10% by weight per unit of surface of the filter material.

9. The filter material according to claim 1, characterized in that the unit weight of its surface is from 10 to 25 g/m2.

10. The filter material according to claim 1, characterized in that it contains two layers of fibrous coating (11, 12)and first floor (11) contains natural fibers and fibers or microcapsules (13A, 13b), and that the first fibrous coating (11) marked the second fibrous surface (12) of thermovalve fibers and polymer fibers.

11. The filter material of claim 10, wherein the first fibrous covering (11) is made from natural fibers, pulp from coniferous wood pulp from deciduous wood, Abaca fibers, or mixtures thereof.

12. The filter material according to claim 1, characterized in that the fibers or microcapsules (1A, 13b) with the material (14), capable of phase transition, linked in the fibrous coating of the binder.

13. The filter material according to item 12, characterized in that the binder is used polyacrylate (Acronal®).

14. The method of obtaining the filter material from one or more layers of fibrous coating on the paper machine according to any one of claims 1 to 13, characterized in that the at least one printed on the paper machine fibrous covering (11) is entered fibers or microcapsules (13A, 13b) with materials (14), capable of phase transition.

15. The method according to 14, wherein the applied one or more materials (14), capable of phase transition, with the transition from solid phase to liquid occurs at a temperature of from 0 to 120°C.

16. The method according to 14, wherein the applied one or more materials (14), capable of phase transition, with the transition from solid phase to liquid occurs at a temperature of from 50 to 100°C.

17. The method of obtaining the filtering material 14, characterized in that the fibers or microcapsules (13A, 13b) with the material (14), capable of phase transition, are applied to the filter material in a device for coating a paper machine in an amount of from 2 to 30% by weight per surface unit f is Trouser material.

18. The method of obtaining the filtering material 17, characterized in that the fibers or microcapsules (13A, 13b) with the material (14), capable of phase transition, are applied to the filter material in a device for coating a paper machine in an amount of from 3 to 10% by weight per unit of surface of the filter material.

19. The method according to 14, characterized in that the fibers or microcapsules (13A, 13b) with the material (14), capable of phase transition, is entered in one of the applied fibrous coatings, in particular in the first of two layers applied fibrous coverings (11, 12), while the first floor contains natural fibers.

20. The method according to 14, characterized in that the fibers or microcapsules (13A, 13b) are connected in damage to the fibrous coating, in particular the first fibrous covering (11), the filter material binder.

21. The method according to claim 20, characterized in that the binder is applied polyacrylate (Acronal®).

22. Bag for batch brewing of tea or coffee, containing the filtering material consisting of one or more layers of fibrous coating, characterized in that it contains a filter material, characterized in claim 1.

23. Bag for batch brewing of tea or coffee according to item 22, wherein there are two layers of fibrous coating is (11, 12), while the first floor (11) contains natural fibers and fibers or microcapsules (13A, 13b), and the first fibrous coating (11) marked the second fibrous surface (12) of thermovalve fibers and polymer fibers.



 

Same patents:

FIELD: textile fabrics, paper.

SUBSTANCE: method is intended for preliminary treatment of fibrous material in production of paper, cardboard and similar produce. Fibrous material is preliminarily treated in mixer of transmission type, which works according to principle of impact mill. Then fibrous material is supplied in the form of crushed liquid fractions or solid substance into precipitating reactor. Gas is also supplied there to create gas space. Gas comprises substance, which assists in precipitation of mineral substance, for instance, carbon dioxide (CO2). Device comprises precipitating reactor and additional activating device that provides for more intense capability of fibers to connect to each other and to precipitated mineral substance. Device may be easily inbuilt into production process of paper manufacture.

EFFECT: highly efficient precipitation of mineral particles on fiber with provision of specified paper properties.

26 cl, 7 dwg

Paper filler // 2345189

FIELD: textile, paper.

SUBSTANCE: filler is designed for paper making and can be used in pulp-and-paper industry. Filler contains calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where filler is essentially free from either cellulose fibre or fibrils or lignocellulose. Filler contains calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where cellulose derivative can contain cationic groups. Besides the invention refers to production process of filler involving mixing the agent substance containing calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, essentially without cellulose fibre or fibrils or lignocellulose. Other production process of filler consists in mixing the agent substance containing calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where cellulose derivative contains cationic groups. The invention refers to method for making paper including preparation of aqueous suspension containing cellulose fibre, suspension addition with filler containing calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where filler is essentially free from either cellulose fibre or fibrils or lignocellulose; dehydration of suspension thus making web or paper sheet. The invention also refers to method for making paper including preparation of aqueous suspension containing cellulose fibre; suspension addition with filler containing calcium salt and cellulose derivative with lattice ionic fractional substitutionality up to approximately 0.65, where cellulose derivative contains cationic groups; dehydration of suspension thus making web or paper sheet.

EFFECT: higher sizing efficiency with good drainage, retention and serviceability of papermaking machine.

24 cl, 3 tbl, 4 ex

FIELD: textiles, paper.

SUBSTANCE: method refers to pulp-and-paper industry, specifically to method for making bag paper, as well as to bag paper with improved service properties. Method for making bag paper involves pulp beating stage at fibre concentration 28-40% and thereafter at fibre concentration 3-6%. It is followed by two-staged addition of reinforcing and at once flocculating agent to pulp. Then paper web is casted and dried. Further beating stage at fibre concentration 3-6% requires power consumption within 20-60 kWt/h per paper ton. The second stage of addition is followed with the third stage of addition implying flocculating agent preceding headbox. Herewith at the first stage, reinforcing and at once flocculating agent is cationic starch of fractional substitutionality 0.040-0.150 in amount 0.1-1.2% of absolutely dry fibre weight, or polyacrylamide in amount 0.1-0.5% of absolutely dry fibre weight. Specified agent is added to pulp, 5-120 minutes prior to paper web casting. At the second stage reinforcing and at once flocculating agent is added in amount 0.005-0.400% of absolutely dry fibre weight. Specified agent is added to pulp, 20-120 seconds prior to paper web casting. At the third stage flocculating agent is anionic montmorillonite microparticle dispersion. Specified agent is added to pulp in amount 0.05-0.50 % of absolutely dry fibre weight. Bag paper is made under the offered method.

EFFECT: lower consumption of reinforcing and flocculating polymers, improved pulp water yield on papermaking machine grid and enhanced consumer paper properties including paper air permeability.

4 cl, 1 tbl, 3 ex

FIELD: textiles, paper.

SUBSTANCE: method refers to pulp-and-paper industry, specifically to method for making bag paper, as well as to bag paper with improved service properties. Method for making bag paper involves pulp beating stage at fibre concentration 28-40% and thereafter at fibre concentration 3-6%. It is followed by two-staged addition of reinforcing and at once flocculating agent to pulp. Then paper web is casted and dried. Further beating stage at fibre concentration 3-6% requires power consumption within 20-60 kWt/h per paper ton. The second stage of addition is followed with the third stage of addition implying flocculating agent preceding headbox. Herewith at the first stage, reinforcing and at once flocculating agent is cationic starch of fractional substitutionality 0.040-0.150 in amount 0.1-1.2% of absolutely dry fibre weight, or polyacrylamide in amount 0.1-0.5% of absolutely dry fibre weight. Specified agent is added to pulp, 5-120 minutes prior to paper web casting. At the second stage reinforcing and at once flocculating agent is added in amount 0.005-0.400% of absolutely dry fibre weight. Specified agent is added to pulp, 20-120 seconds prior to paper web casting. At the third stage flocculating agent is anionic montmorillonite microparticle dispersion. Specified agent is added to pulp in amount 0.05-0.50 % of absolutely dry fibre weight. Bag paper is made under the offered method.

EFFECT: lower consumption of reinforcing and flocculating polymers, improved pulp water yield on papermaking machine grid and enhanced consumer paper properties including paper air permeability.

4 cl, 1 tbl, 3 ex

FIELD: textiles, paper.

SUBSTANCE: method refers to pulp-and-paper industry, specifically to method for making bag paper, as well as to bag paper with improved service properties. Method for making bag paper involves pulp beating stage at fibre concentration 28-40% and thereafter at fibre concentration 3-6%. It is followed by two-staged addition of reinforcing and at once flocculating agent to pulp. Then paper web is casted and dried. Further beating stage at fibre concentration 3-6% requires power consumption within 20-60 kWt/h per paper ton. The second stage of addition is followed with the third stage of addition implying flocculating agent preceding headbox. Herewith at the first stage, reinforcing and at once flocculating agent is cationic starch of fractional substitutionality 0.040-0.150 in amount 0.1-1.2% of absolutely dry fibre weight, or polyacrylamide in amount 0.1-0.5% of absolutely dry fibre weight. Specified agent is added to pulp, 5-120 minutes prior to paper web casting. At the second stage reinforcing and at once flocculating agent is added in amount 0.005-0.400% of absolutely dry fibre weight. Specified agent is added to pulp, 20-120 seconds prior to paper web casting. At the third stage flocculating agent is anionic montmorillonite microparticle dispersion. Specified agent is added to pulp in amount 0.05-0.50 % of absolutely dry fibre weight. Bag paper is made under the offered method.

EFFECT: lower consumption of reinforcing and flocculating polymers, improved pulp water yield on papermaking machine grid and enhanced consumer paper properties including paper air permeability.

4 cl, 1 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention can be used for production of deposited calcium carbonate used as paper filler. Secondary particle diameter of deposited calcium carbonate is 1-10 mcm. Deposited calcium carbonate consists of aggregated primary particles of spindle calcium carbonate with greater particle diameter within 0.5 to 3.0 mcm, smaller diameter within 0.1 to 1.0 mcm with ration of specified diameters equal to 3 or more. Specific surface area BET of primary particles of calcium carbonate is 8-20 m2/g, cell volume is 1.5-3.5 cm3/g. Method of production of deposited calcium carbonate includes as follows. Carbon dioxide or carbon dioxide gas is injected in calcium hydroxide suspension concentrated 100-400 g/l, prepared by wet calcined liming activity of which 4 "н." HCl at third minute value is reduced to 150-400 ml. Reaction is resulted in carbonisation degree within 50 to 85%. Then 1 to 20 vol % of calcium hydroxide suspension is added. Reaction is complete with injection of carbon dioxide or carbon dioxide gas. The paper containing the specified calcium carbonate as filler is offered as well.

EFFECT: enhanced paper bulkiness.

7 cl, 2 tbl, 10 ex

FIELD: textile fabrics, paper.

SUBSTANCE: composition concern pulp and paper industry and is intended for cellulose-bearing materials surface treatment. The first composition includes modified carbamide - formaldehyde oligomer and in the capacity of modifier is sodium salt of carboxymethyl cellulose. The second composition contains mentioned above components and melamine. The third composition contains components of the first composition and cationic starch.

EFFECT: improving of composition and strength properties of cellulose-bearing materials.

3 cl, 3 tbl, 12 ex

FIELD: textile fabrics, paper.

SUBSTANCE: composition concern pulp and paper industry and is intended for cellulose-bearing materials surface treatment. The first composition includes modified carbamide - formaldehyde oligomer and in the capacity of modifier is sodium salt of carboxymethyl cellulose. The second composition contains mentioned above components and melamine. The third composition contains components of the first composition and cationic starch.

EFFECT: improving of composition and strength properties of cellulose-bearing materials.

3 cl, 3 tbl, 12 ex

FIELD: textile fabrics, paper.

SUBSTANCE: composition concern pulp and paper industry and is intended for cellulose-bearing materials surface treatment. The first composition includes modified carbamide - formaldehyde oligomer and in the capacity of modifier is sodium salt of carboxymethyl cellulose. The second composition contains mentioned above components and melamine. The third composition contains components of the first composition and cationic starch.

EFFECT: improving of composition and strength properties of cellulose-bearing materials.

3 cl, 3 tbl, 12 ex

FIELD: paper; chemistry.

SUBSTANCE: method of cellulose fiber modification is realised in the following manner. Suspension mass of cellulose fibers is prepared. In process of its bleaching cellulose derivative is added in at least one stage of acid bleaching. pH of suspension mass is in the interval from approximately 1 to approximately 4, and temperature - in interval from approximately 30 to approximately 95°C. As cellulose derivative carboxy-alkyl-cellulose is used, for instance, carboxy-methyl-cellulose. From this suspension of bleached fiber mass paper is produced by means of dehydration of this suspension on the mesh with formation of paper.

EFFECT: higher strength in wet condition and softness of paper.

42 cl, 2 dwg, 1 ex

FIELD: technological processes; chemistry.

SUBSTANCE: method for preparation of filter-sorption material includes application of silica-alumina mineral on substrate. Substrate used is basalt fibers, and silica-alumina mineral is bentonitic clay with montmorillonite content of at least 80%. Basalt fibers are processed by 5-7% water solution of alkali, bentonitic clay that has been previously exposed to soda activation is added, then mixed with addition of binding agent selected from aluminium salts, at ratio of bentonitic clay and binding agent equal to 1:3, heated at temperature of 50-100°C for 2 hours, material is cooled, flushed by water and exposed to thermal activation at the temperature of 110-120°C.

EFFECT: higher sorption capacity of filter-sorption material capable of regeneration, and expansion of material application sphere.

3 tbl

FIELD: technological processes.

SUBSTANCE: water or gas sol that contains nanopowder on the basis of aluminium is pumped through holes of perforated membrane used as basis of filtering material, at that, nanofibers of aluminium oxide hydrate AlOOH are created in holes of filtering material perforation in preset amount. Nanopowder on the basis of aluminium is produced with electric explosion of aluminium wires at density of energy introduced in wires of 10-20 kJ/g in medium of inertial gas with air content of 2-5% from their total volume. Invention provides conditions for formation of amorphous or island oxide and oxynitride film with certain structure on surface of particles on the basis of aluminium, and this film promotes formation of maximum amount of AlOOH aluminium oxide hydrate nanofibers in hydrolysis of aluminium particles.

EFFECT: method improvement.

2 dwg, 2 tbl

Filtering cloth // 2340387

FIELD: textile.

SUBSTANCE: invention is related to production of filtering materials, that can be used when cleaning hot process gases and industrial air at excess temperature (up to 300°). Filtering cloth is weaved at loom by herringbone weaving pattern of the main and filling threads. Surface density of filtering cloth is from 250 to 350 g/m2, threads density in 10 cm section is from 310 to 330 in base and from 180 to 200 in weft . Additionally, air permeability of cloth is from 40 to 200 dm3/m2 s.

EFFECT: increased temperature of operation while preserving or improving cleaning quality and rate, no shrinkage at thermal treatment.

2 cl, 2 ex

FIELD: chemistry.

SUBSTANCE: invention concerns application of polymerisates containing thermoplastic polymers, as filtering auxiliary and/or stabilising substances, and method of water fluid filtration and/or stabilisation. Water fluid filtration and/or stabilisation uses polymerisate in the form of polymer powder containing the following components, wt %: (a) 20 to 95 of at least one thermoplastic polyolefin and polyamide polymer, and (b) 80 to 5 of at least one substance selected out of group including silicates, carbonates, oxides, silica gel, kieselguhr, diatomite earth and linked polyvinyllactams and their mixes. Polymer powder is obtained by compounding of thermoplastic polymer (a) and substance (b) in extruder with physical and/or chemical interaction.

EFFECT: adjustable absorption by the use of insoluble, recoverable, chemically inert, slightly inflating polymerisates with large surface area.

26 cl, 2 tbl

FIELD: chemistry.

SUBSTANCE: invention concerns application of polymerisates containing thermoplastic polymers, as filtering auxiliary and/or stabilising substances, and method of water fluid filtration and/or stabilisation. Water fluid filtration and/or stabilisation uses polymerisate in the form of polymer powder containing the following components, wt %: (a) 20 to 95 of at least one thermoplastic polyolefin and polyamide polymer, and (b) 80 to 5 of at least one substance selected out of group including silicates, carbonates, oxides, silica gel, kieselguhr, diatomite earth and linked polyvinyllactams and their mixes. Polymer powder is obtained by compounding of thermoplastic polymer (a) and substance (b) in extruder with physical and/or chemical interaction.

EFFECT: adjustable absorption by the use of insoluble, recoverable, chemically inert, slightly inflating polymerisates with large surface area.

26 cl, 2 tbl

FIELD: process flows, filters.

SUBSTANCE: invention is related to sorbtion filtering materials used in safety equipment intended for filtering of air from gases, vapors and aerosols. The material consists of air-permeable base surfaces, layer of electrically charged ultrathin polymer fiber for air filtering from aerosols and sorbing layer that contains fixed particles of absorbent carbon consisting of mixture of coal - calalytic agent of the KT type and gas coal of SKT type of fineness 60-80 micron, distributed and fixed in the volume of pulp fibers at rate coal - calalytic agent of the KT type / gas coal of SKT type as 1.15-3.5:1; at that the layer of electrically charged ultrathin polymer fiber is applied in the high voltage field to sorbing layer.

EFFECT: provided possibility of all-purpose respiratory protection from hazardous gases, vapors and aerosols when the material is used in individual and shared air filtering equipment.

1 tbl, 2 dwg

FIELD: textile; paper.

SUBSTANCE: presented bed for implementation of hydrocrowding process is manufactured by means of including in it depressed fibres during its manufacturing or forming of depressed fibres by means of calendering or grinding of initial fabric. Including of depressed fibres into bed at manufacturing of nonwoven fabrics provides higher crowding of fibres forming nonwoven fabrics.

EFFECT: creation of more rugged finished nonwoven material.

20 cl, 10 dwg

FIELD: chemistry.

SUBSTANCE: as initial raw material for filtering material production preliminary accumulated and dehydrated sediment from water purification, which mainly contains contaminant colloid particles, having chemical affinity with iron, is used. Sediment is pressed in briquettes with density 2.6 g/cm3 and fired by thermal sintering into conglomerate at temperature 1200-1400°C. Water purification is carried out on produced filtering material.

EFFECT: cheap and available raw material for production of filtering material and increase of its absorptive ability.

3 cl, 1 ex, 1 tbl

Absorbing filter // 2335330

FIELD: technological processes.

SUBSTANCE: absorbing filter is intended for air treatment plants removing harmful and toxic admixtures and aerosols from air and relates to group protection equipment. Absorbing filter includes cylindrical case with anti-aerosol and sorption treatment stages placed in sequence along air course, and inlet and outlet holes. First stage along air course is anti-aerosol one; it is made of cellulose and mineral fiber based materials, while the second, sorption stage is made of double-layer material where the first layer along air course consists of active carbon modified by copper and/or nickel salts and active carbon modified by copper, chrome and silver salts, at the weight ratio of 1:(0.75-1.5). The second layer is made of cellulose fiber material containing 30-50 wt % of active carbon and/or active carbon modified by copper and chrome salts.

EFFECT: improved air treatment quality, increased life time of absorbing filter and reliability of acid gas (such as chlorine or hydrogen sulfide) and ammonium absorption.

3 dwg, 1 ex

Absorbing filter // 2335330

FIELD: technological processes.

SUBSTANCE: absorbing filter is intended for air treatment plants removing harmful and toxic admixtures and aerosols from air and relates to group protection equipment. Absorbing filter includes cylindrical case with anti-aerosol and sorption treatment stages placed in sequence along air course, and inlet and outlet holes. First stage along air course is anti-aerosol one; it is made of cellulose and mineral fiber based materials, while the second, sorption stage is made of double-layer material where the first layer along air course consists of active carbon modified by copper and/or nickel salts and active carbon modified by copper, chrome and silver salts, at the weight ratio of 1:(0.75-1.5). The second layer is made of cellulose fiber material containing 30-50 wt % of active carbon and/or active carbon modified by copper and chrome salts.

EFFECT: improved air treatment quality, increased life time of absorbing filter and reliability of acid gas (such as chlorine or hydrogen sulfide) and ammonium absorption.

3 dwg, 1 ex

FIELD: methods of production of electret items, electret filters and respirators.

SUBSTANCE: the invention presents a method of production of electret items, electret filters and respirators with heightened resistivity to the oil mist. The invention falls into production processes of electret items, electret packed beds and respirators, and may be used for removal of corpuscles from gases, especially for removal of aerosols from air. The method provides for: formation of a melted material consisting of a mixture of a polymer composed of a mixture of a polymer representing a non-current-conducting thermoplastic resin with a specific resistivity exceeding 1014 Ohms·cm with a fluorine compound as an additive compound; shaping it to the required form and quenching it up to the temperature lower than the melting point of the polymer. The material is calcined and treated with an electric charge to give it electret properties. The invention improves the capability of filtering oily aerosols.

EFFECT: the invention improves the capability of filtering oily aerosols.

19 cl, 16 tbl, 19 dwg, 23 ex

Up!