Method of producing nanofibres from polymer solution and device for its realisation

FIELD: chemistry.

SUBSTANCE: inventions relate to method of producing nanofibres from polymer solution by method of electrostatic fibre formation in electric field, created due to difference of potentials between charged electrode and opposite electrode and device for its realisation. According to method polymer solution is supplied into electric field for electrostatic fibre formation by surface of rotating charged electrode, part of whose surface is submerged into polymer solution. Simultaneously formed nanofibres under impact of electric field are displaced from rotating charged electrode to opposite electrode and then are laid on means for their laying. Nanofibres are formed on cylindrical or quadrangular, or polygonal prismatic surface of charged electrode, and opposite electrode is placed opposite free part of charged electrode, air being sucked from space between charged electrode and opposite electrode. Device for method realisation contains rotating charged electrode and opposite electrode. Charged electrode represents cylinder or quadrangular or polygonal prism, and opposite electrode is placed opposite free part of charged electrode. Polymer solution for electrostatic fibre formation by surface of rotating charged electrode is supplied into created by electrodes electric field, simultaneously formed nanofibres under impact of electric field are displaced from rotating charged electrode to opposite electrode and then are directed to means of their laying, which represents air-permeable transporter. Means for laying nanofibres can be formed by flat carrying material of nanofibres.

EFFECT: increase of productivity of nanofibres production.

14 cl, 9 dwg

 

The technical field

The invention concerns a method of manufacturing nanofibers from a polymer solution by electrostatic molding fiber in an electric field created by the potential difference between the charged electrode and the opposite electrode.

Further, the invention relates to a device for carrying out the method containing the charged electrode and the opposite electrode with different potential, between which an electric field.

The existing state of technology

Polymer fibers with diameters ranging from 10 to 1000 nanometers represent a new type of materials with extreme values of some properties. Typical applications of layers of polymer fibers are filtering gases and liquids, used as barrier materials for capture of submicron particles, bacteria and chemical products, where achieved exceptionally high filtration capacity. Nanofibres are used as battery separators, reinforcement of composite materials, as well as carriers of drugs and tissue implants in medicine. Large specific surface layer of nanofibers available for gaseous and liquid media, creates the preconditions for the provision of specific sorption properties of these fibers and theiruse as carriers of various active substances, for example catalysts. The unusually small size of pores in the layers of nanofibers are a prerequisite extremely high insulating properties.

Nanofibres produced from different types of polymers, polymer blends and mixtures of polymers with low molecular weight additives in the processes of formation of polymer solutions. In contrast to the essentially similar processes of formation of the polymer melt during processing solutions are achieved smaller diameters of the fibers due to the lower viscosity of the solutions. For forming fibers from solutions used mechanical force of the moving gaseous medium or Coulomb forces in an electrostatic field. In the case of electrostatic molding obtained fibers with smaller diameters, so as to separate the formed fibers under the action of equal distribution of charges in their volume split into several fibrils.

Hitherto known methods and devices for obtaining nanofibers method of their formation from polymer solutions flow of air is described, for example, in US 6382526 and US 6520425. Polymer solutions are in the die plate for forming fibers having a cross section in the form of a circular ring. Forming fibers from solutions is due to the mechanical action of the air flow supplied into a circular ring, in some cases, through another number is zeway profile outside of the nozzle, in the resulting fiber diameter 200-3000 nm.

Description of methods of forming fibers from polymer solutions under the action of the electrostatic field with an average tension 50000-500000/m described in patent applications WO 0127365, WO 0250346, US 2002/0175449 A1 and US 2002/084178 A1. According to these solutions, the polymer solution is fed into the cylindrical die inner diameter of 0.5 to 1.5 mm NIB is connected to the source of constant voltage. The resulting solution under the action of electrostatic forces of attraction to the opposite electrode, usually grounded, and at the same time under the action of this force is forming thin elementary fibers, which are then split, forming a strand of fibrils corresponding smaller diameter. The molding process is carried out from one dies, or group of stationary or moving nozzles to improve the device performance, a uniform coating of the opposite electrode or flat lining material moving along the surface of the opposite electrode or near its surface.

The disadvantage of all the above methods and apparatuses for the production of nanofibers is a very small amount of the treated polymeric material in time. In the case of forming nanofibers mechanical selmeier of the obtained fibers, among other things, depends on the mass ratio of air and polymer solution flowing through the die plate. When forming under the action of Coulomb forces in an electrostatic field, at the outlet of the nozzle should be formed so-called Taylor cone, which is the condition for the formation of fibers and due to the relatively narrow range of the ratio of the speed of the expiry of the polymer solution from a Spinneret and electric field strength. Maximal controlled electric fields are limited to the dielectric constant of air, i.e. in excess of this limit in the interelectrode space arise electrical discharges. In view of the above circumstances and achievable concentrations of polymer solution for forming fibers on one filiere you can handle approximately 0.1-1 gram of polymer per hour, therefore, from the viewpoint of industrial use manufacture of nanofibers becomes very problematic.

The aim of the invention is to provide a method and device that would have industrial applicability and ensure high performance of the receiving fiber.

The invention

The purpose of the invention is achieved by a method for the production of nanofibers according to the invention, the essence of which is that the polymer is Astor is supplied in the electric field for forming the fiber surface of a rotating charged electrode, on part of the circumference of the charged electrode is rotated to the opposite electrode formed surface for forming fibers. Under favorable conditions, a polymer solution capable of forming the electric field cones Taylor not only at the end of the die, but on the surface its level, and that is particularly advantageous in a thin layer on the surface of a rotating body, partially submersible in a vessel with this solution. Mentioned favorable conditions in this case are the corresponding viscosity of the solution, due to the molecular weight of the polymer, its concentration and temperature corresponding to the surface tension, depending on the type of polymer and the presence of surfactants, and the corresponding value of the electric conductivity of the solution is achieved by the presence of low molecular weight electrolyte. Thus, the dimensions of the surface for forming fibers correspond to the size and shape of the charged electrode and the opposite electrode. Therefore, the resultant nanofibers in proportion to the size and shape of the surface for forming fibers.

According to paragraph 2 of the claims, it is advantageous if the fibres, spun from a polymer solution on the surface of the forming fibers charged electrode, under the action of electric the field definition addicted to this field to the opposite electrode, before him laid a means for laying nanofibers and form a layer on the tool. This method allows you to create layers of nanofibers with the provision of high quality and uniformity of the layer essentially any width corresponding to the width of the device.

The following improvement is achieved according to the paragraph 3 of the claims. The action of the air flow together with the electric field contributes to uvlecheniu fibers from a charged electrode.

This is advantageous if nanofibres addicted in the direction toward the opposite electrode and placed on a breathable styling tool for nanofibers, located in front of the opposite electrode, and form a layer on the tool.

The air flow going to the opposite electrode, is formed by sucking air by the method according to paragraph 5 of the claims. This simple approach helps uvlecheniu fibers to the opposite electrode and thus increase performance.

According to paragraph 6 of the claims, in the space between the charged electrode and the opposite electrode nanofibres deviate from the direction to the opposite electrode by the air flow and this flow of air fed to the air-permeable means for laying nanofibers outside e tricesimo field, under the action of which is forming fibers from a polymer solution.

The air flow to reject nanofibers from a referral from a charged electrode to the opposite electrode, according to paragraph 7 of the claims that is generated by sucking air from the space between the electrodes in the space which is in relation to the charged electrode for breathable tool for laying nanofibers.

To increase the performance of the device is advantageous if, 20 under paragraph 8 claims, in space, in which are fond of nanofibres, is fed to the auxiliary drying air, contributing to accelerate the evaporation of the solvent of polymer nanofibers obtained by electrostatic spinning and moving in the space between the electrodes.

In order to increase the efficiency of drying, i.e. accelerate evaporation of the solvent of the polymer, it is advantageous if at least part of the auxiliary drying air is removed from the space, located in relation to the charged electrode before carrying breathable tool, but does not penetrate through this support tool.

The method according to paragraph 10 of the claims is used to increase the performance of the device, as by heating auxiliary input sushi is inogo air makes it possible to extract a greater amount of solvent vapours, formed during the drying of the nanofibers.

For all cases, the method is advantageous in the use of aqueous polymer solution, as in this case simplifies the design of the device as a whole and there is no need to put harmful or hazardous gases from the solvent of the polymer.

The essence of an apparatus for implementing the above methods is that the charged electrode is rotatable and a part of its circumference being immersed in the polymer solution, while the opposite free part of the circumference of the charged electrode placed opposite electrode. Thanks to this arrangement, the device is capable of feeding into the electric field of a sufficient quantity of polymer solution.

In the performance of the device under item 13 of the claims of the opposite electrode covers a part of the free part of the circumference of the charged electrode along its length, through which all this space between the electrodes, an electric field having the same intensity.

Between the two electrodes is a tool for laying nanofibers on the surface of the nanofibers are placed in the layer.

Suitable linking devices by paragraphs 15 and 16 of the claims, when the means for laying nanofibers made breathable, and t is the train formed by the air flow, through this tool.

In an alternative implementation, paragraph 17 claims, outside the space between the electrodes placed breathable styling tool for nanofibers, and it creates negative pressure, which produces a stream of air entrained nanofibres from the space between the electrodes to means for laying nanofibers, through which passes at least part of the air. It is expedient to provide means for laying nanofibers.

To accelerate evaporation of the solvent from the nanofibers in the device is supplied auxiliary drying air.

Appropriate administration charged electrode described in paragraphs 26-28 of the claims, the purpose of which is to achieve the best effect of forming fibers in the device in which the electrodes will be used.

Brief description of drawings

Examples of execution of the device according to the invention is shown diagrammatically in the attached drawings, where: figure 1 - section of the device with the opposite electrode covering a part of the circumference of the charged electrode; figure 2 - section of the device in connection with means for laying nanofibers outside the space between the electrodes; figure 3 is a section of the device in which the means for laying nanofibers formed flat bearing material, RA is put between the electrodes in the guide, educated tensioning elements; figure 4 - performance similar to the performance of figure 1, with a fixed electrode formed of longitudinal rods and the guide of a flat carrier material nanofibers, located between terminals; figa-s - front and side views - different surface of the cylinder, forming a charged electrode.

Examples of carrying out the invention

Device for production of nanofibres from polymer solution by electrostatic molding fiber in an electric field created by the potential difference between the charged electrode and the opposite electrode, contains the feeder 1 at least partially filled with the polymer solution 2, in which the immersed portion of the circumference of the rotary position of the cylinder 3, which is known, not shown here, by the way, is connected to a DC voltage source and forms a charged electrode 30. Opposite the free part of the circumference of the charged electrode 30 is located opposite the electrode 40 with different potential. This electrode is usually grounded, as shown in figure 1, or known, not shown here, by the way, is connected to the DC voltage of the other polarity.

In the illustrated implementations, the cylinder 3 is immersed in the polymer solution 2 the lower part of the circle. However, this to is Panovko can be changed according not shown here, the example of execution, in which the polymer solution is fed into a closed vessel from which the solution is supplied onto the surface of a charged electrode, or the cylinder, forming a charged electrode, stacked in such a closed vessel, and the polymer solution is moistened, for example, the upper part of the surface of the circumference of the cylinder, which on its circumference makes from the vessel the required amount of polymer solution.

In the example of execution shown in figure 1, the opposite electrode 40 is made of a perforated electrically conductive material, such as sheet metal, which is given by convolution of a cylindrical shape, and the cylindrical surface of this electrode forms the input part of the vacuum chamber 5 connected to the vacuum source 6. The portion of the surface of the opposite electrode 40 is rotated to a charged electrode 30 serves as a guide 41 breathable flat carrier material 72 nanofibers, which is made, for example, in the form of a lining of textile material, and laid on a marking device 81, located on one side of the vacuum chamber 5, and the winding device 82, located on the other side of the vacuum chamber 5. In this shown here the performance of a flat carrier material 72 nanofibers forms samovosproizvedenie means 7 for laying again the Windows.

Feeder 1 polymer solution 2 was open and provided with at least one inlet 11 polymer solution 2 and at least one release 12 polymer solution 2. The inlet 11 and release 12 polymer solution 2 serve for circulation of polymer solution 2 and maintain a constant height level in the feeder 1.

The space between the charged electrode 30 and the opposite electrode 40 is attached supply 90 auxiliary drying air 9, which, as appropriate, may in a known manner be heated, for example, in the heater included in the feed line 90 auxiliary drying air 9. Auxiliary drying air 9 partially or fully is drawn from the space between the charged electrode 30 and the opposite electrode 40 into the chamber vacuum 5 or leaves space on the other side, opposite the entrance.

When rotating charged electrode 30, a portion of a circle which gets into the polymer solution 2, the polymer solution 2 is made around the circumference of the charged electrode 30 of the feeder 1 into the space between the charged electrode 30 and the opposite electrode 40, which created an electric field. In this space on the surface of the charged electrode 30 of the polymer solution 2 are formed cones Taylor have is their high resistance and which places primary formation of nanofibers 20. Under the influence of an electric field formed nanofibers 20 are addicted to the opposite electrode 40 and the result is placed on the surface lining of textile material, which serves as a flat carrier material 72 nanofibers, forming a layer, the thickness of which is adjusted by setting the speed of marking devices 81 and winding propolene 82.

Uvlecheniu nanofibers 20 from the charged electrode 30 to the opposite electrode 40 facilitates the movement of air is sucked from the external space into the camera rarefaction 5 passing around the feeder 1 polymer solution 2 and the charged electrode 30 and penetrates the lining of textile material, serving as a flat carrier material 72 nanofibers, and the opposite electrode 40.

In the implementation shown in figure 4, the opposite electrode 40 is made of other suitable way, for example, of the rods 400, parallel to the rotating cylinder 3 forming the charged electrode 30. Between terminals 400, forming the opposite electrode 40, installed auxiliary rods 410, forming the guide 41 to the flat carrier material 72 nanofibers forming means 7 for laying nanofibers. However, some or all of the support rods 410 can be performed is rotatable in order to reduce resistance when the direction of the carrier material 72 nanofibers. In this implementation guide for flat carrier material 72 nanofibers can be formed also by the rods 400, forming the opposite electrode 40. The described device provides a large amount formed nanofibers 20, so that the limiting performance factors apparatus for forming fibers are the evaporation rate of the solvent of the polymer formed from nanofibers 20 and the speed of discharge of the evaporated solvent, because of the volatile solvent in the space between the charged electrode 30 and the opposite electrode 40 within a short period of time passed would be in a state of saturated vapor, preventing further evaporation of the solvent. Therefore, the device is equipped with inlet 90 of the auxiliary drying air 9, which provides the abstraction of solvent vapours mainly from the space between the charged electrode 30 and the opposite electrode 40. To increase the effect can be heated auxiliary drying air 9.

The following is an example of execution of the device according to the invention shown in figure 2, in which, similarly to the execution of figure 1, the charged electrode 30 is made as a rotating part of its circumference immersed in the polymer solution 2 in the feeder 1, the circulation of the solution of evista level in the feeder 1 are supported by the flow of polymer solution 2 through the inlet 11 and release 12. Opposite the free part of the circumference of a rotating charged electrode 30 is located opposite electrode 40, formed by a system of wires or rods, attached to the earth (grounded) or known, not shown here way connected to the constant voltage source of opposite polarity with respect to the charged electrode 30. Outside the space between the electrodes 30, 40, which created the electric field and the electrostatic spinning of nanofibers 20 of the polymer solution 2, posted by air-permeable conveyor 71 nanofibers forming means 7 for laying nanofibers, for which the camera is located rarefaction 5, attached to the vacuum source 6.

Nanofibres 20, coming under the influence of an electric field from the charged electrode 30 to the opposite electrode 40, under the action of a stream of air is sucked into the chamber vacuum 5, rejected and transferred to the air-permeable conveyor 71, where they are placed in the layer due to the movement of the conveyor 71 is taken out from the device, then the corresponding, not shown here, the method is subjected to finishing and finishing or fit. To increase the amount of air in the space between the electrodes 30, 40 device has an inlet 90 / the CSOs drying air 9, which enters the chamber of the device in the direction of the air-permeable conveyor 71, thus contributing further to the deviation of the nanofibers 20 from a direction toward the opposite electrode 40 in the direction of the air-permeable conveyor 71.

And this performance can be provided by different modifications of execution and form the opposite electrode. In addition, before the air-permeable conveyor belt 71 can be inserted lining of textile material or other flat bearing material 72 and put a layer of nanofibers 20 on this flat bearing material 72.

Figure 3 shows the performance of the device with a rotating charged electrode 30, the lower part of the circumference of which is immersed in the polymer solution 2. Opposite the free part of the circumference of the charged electrode 30 is located opposite electrode 40, formed by a system of rods parallel to the axis of rotation of the charged electrode 30 and the space between the electrodes 30, 40 are sent flat bearing material 72 nanofibers by means of the guide 41, formed by the tensioning elements 42.

The charged electrode 30 is formed by a body made with the possibility of rotation, for example, in the form of a cylinder, four-sided or many-sided prisms, etc. When it is advantageous if the axis of rotation is the axis of symmetry of the applied bodies is. Around the circumference of the cylinder 3 made the tabs 31 and/or grooves 32. Examples of suitable forms the surface of the cylinder, suitable for use as a charged electrode, as shown in Fig. 5A-e, however, these forms do not limit the possibility of using other versions, and serve only as an example. In the above described versions of the device in the space between the electrodes provides for the establishment of a permanent electric field. However, this device may be equipped with means for creating an intermittent electric field, if necessary for forming or placing a layer of nanofibers 20.

Specific examples of the method below.

Example 1

Feeder 1 polymer solution 2 of the device of figure 1 is filled dwenadzatiperstnuu aqueous solution of polyvinyl alcohol with a degree of hydrolysis 88%, molecular weight Mw=85000 containing 5 molar percent of citric acid as a structuring agent per unit lattice of the polymer. The viscosity of the solution - 230 mPa.s at 20C conductivity - 31 MS/cm, the surface tension of 38 mn/m Polymer solution 2 flows into the feeder 1 through the inlet 11 and flows through issue 12, while the height of the layer of polymer solution 2 in the feeder 1 is supported by provisions in the trigger 12. The charged electrode 30 is formed by a cylinder 3 with a diameter of 30 mm, in the performance of pigs and rotates clockwise at a speed of 2.5 rpm. The cylinder 3 is connected to a DC voltage source +40 kV. The device is made according to Fig. 1, it is sent to the lining of textile material forming a flat bearing material 72 nanofibers. Under the action of vacuum in the chamber underpressure 6 for breathable opposite electrode 40 is a flat material adjacent to the opposite electrode 40, which thus forms a guide of this material. On the surface of the rotating cylinder 3 polymer solution 2 is taken out of the feeder 1, under the action of an electric field between the electrodes 30, 40 are formed cones Taylor and the formation of nanofibers 2 with a diameter of 50-200 nanometers. Nanofibres 20 are addicted to the opposite electrode 40 and placed on running through the lining of textile material, which form a layer, the thickness of which is regulated by the speed of movement of the lining of textile material. In the space between the electrodes is fed to the auxiliary drying air 9 at a temperature of 50C. If the length of the rotating cylinder 3 in one meter mass obtained from the nanofiber layer is formed with a speed of 1.5 g/min

Example 2

Feeder 1 polymer solution 2 the mouth of the STS of figure 2 is filled with ten percent aqueous solution of polyvinyl alcohol with a degree of hydrolysis of 98 percent, molecular weight Mw=120000 containing 5 molar percent of citric acid as a structuring agent per unit lattice of the polymer. The viscosity of the solution - 260 mPa.s at 20C, conductivity, obtained by adding a small amount of an aqueous solution of NaCl, 25 MS/cm, the surface tension is lowered by adding 0.25% nonionic surfactant to 36 mn/m Polymer solution 2 flows into the feeder 1 through the inlet 11 and flows through release 12, the position of which determines the height of the layer of polymer solution 2 in the feeder 1. The cylinder 3, forming a charged electrode has a diameter of 50 mm and a smooth surface, as shown in figa. The cylinder 3 is connected to a DC voltage source +40 kV, wire opposite electrode 40 is a DC voltage of -5 kV. In the space between the charged electrode 30 and the opposite electrode 40 is formed nanofibers 20 with a diameter of 50-200 nanometers, which under the action of air which is sucked off from the space between the electrodes 30, 40 into the chamber of the depression 5, and the auxiliary drying air 9 addicted to the surface of the air permeable conveyor 71, where they are placed in the layer in an amount of 1.8 g/min - if the length of the rotating cylinder at one meter.

Prom the industrial applicability

The method and the device according to the invention is applicable to obtain layers of nanofibers with a diameter of 50-200 nanometers. These layers can be used for filtering as battery separators to create a special composite materials, design of sensors with very small time constant, in the manufacture of protective clothing, medicine and other fields.

1. Method for the production of nanofibers from a polymer solution (2) electrostatic forming fibers in an electric field created by the potential difference between the charged electrode (30) and opposite electrode (40), wherein the polymer solution (2) is connected in an electric field for electrostatically forming a fiber surface of a rotating charged electrode (30), a portion of the surface which is immersed in the polymer solution (2), at the same time educated nanofibres (20) under the action of the electric field are shifted from rotating charged electrode (30) to the opposite electrode (40) and then placed on the tool (7 for laying of nanofibers, wherein the nanofibers (20) are formed on a cylindrical or rectangular or polygonal prismatic surface of the charged electrode (30)and opposite electrode (40) is located against the free part zarazenog the electrode (30), and the air from the space between the charged electrode (30) and opposite electrode (40) is extracted.

2. The method according to claim 1, characterized in that nanofibers (8)carried by a stream of air towards the counter electrode (40), are placed before him on the air permeable means (7) for laying nanofibers.

3. The method according to claim 1 or 2, characterized in that the space between the electrodes is fed to the auxiliary drying air (9).

4. The method according to claim 3, characterized in that at least part of the auxiliary drying air (9) is discharged from the space in front of the air permeable means (7) for laying nanofibers without penetration through the tool (7).

5. The method according to claim 3 or 4, characterized in that the auxiliary drying air (9) before entering into the space between the electrodes is heated.

6. The method according to claim 1, characterized in that the polymer solution is an aqueous solution.

7. Device for the production of nanofibers from a polymer solution (2) electrostatic forming fibers in an electric field created by the potential difference between the charged electrode (30) and opposite electrode (40), wherein the polymer solution (2) is connected in an electric field for electrostatically forming a fiber surface of a rotating charged the second electrode (30), the portion of the surface which is immersed in the polymer solution (2), at the same time educated nanofibres (20) under the action of the electric field are shifted from rotating charged electrode (30) to the opposite electrode (40) and then placed on the tool (7) for laying nanofibers, characterized in that the charged electrode (30) is a cylinder or rectangular or polygonal prism, and the opposite electrode (40) is located against the free part of the charged electrode (30).

8. The device according to claim 7, characterized in that the part of the free surface of the charged electrode (30) along its entire length is covered with the opposite electrode.

9. The device according to claim 7 or 8, characterized in that between the electrodes (30, 40) has means (7) for laying nanofibers.

10. The device according to claim 9, characterized in that the means (7) for laying nanofibers made breathable, and the space behind it in the direction of the charged electrode (30) is connected to the vacuum source.

11. The device according to claim 7, characterized in that the outside space between the electrodes (30, 40) is placed breathable means (7) for laying nanofibers, while the space behind the tool (7) in the direction of the charged electrode (30) is connected to the source (6) the dilution used for the formation of the air flow is directed is on to this tool (7).

12. The device according to claim 7, characterized in that the means (7) for laying of nanofibers formed of air-permeable conveyor (71).

13. The device according to claim 7, characterized in that the means (7) for laying of nanofibers formed flat bearing material (72) nanofibers.

14. The device according to claim 7, characterized in that the space between the electrodes (30, 40) is gated inlet (90) auxiliary drying air (9).



 

Same patents:

FIELD: textile; paper.

SUBSTANCE: filament fibers are produced. At the very least, part of them have a natural crimp, furthermore, filament fibers are laid out in warehouse storage for the transporting device creating a reserve. Furthermore, the filament fibers by means of the transporting device are relocated at the direction of the strengthening device. Furthermore, a gas current runs along the filament fibers in the direction of the transport for the reserve of filament fibers, along the surface of the reserve filament fibers.

EFFECT: even or homogenous structure.

13 cl, 4 dwg

FIELD: textile, paper.

SUBSTANCE: invention relates to technology of nonwoven material manufacturing and can serve as basis for production of construction, decoration and other similar materials. Nonwoven needled material which contains nonwoven linen from synthetic fibres, strengthening threads and binding material, strengthening threads being made from glass fibre and evenly located along nonwoven linen. Nonwoven linen is made from not less than five-seven webs, laid along and across nonwoven linen, strengthening glass fibre threads are laid on material lining surface and are fixed with linen fibres as a result of nonwoven linen needling.

EFFECT: increase of strength and extension of functional possibilities of nonwoven needled material.

3 cl, 2 tbl, 2 dwg

FIELD: technological processes.

SUBSTANCE: fibrous mat contains at least two substantially longitudinal and parallel arrays of fiber. At that arrays are connected with the help of retaining facilities, which embrace every array at an angle so that retaining facilities affect every array, which is substantially symmetrical relative to axis located in longitudinal direction between arrays.

EFFECT: improved strength properties of finished laminated material.

28 cl, 13 dwg

FIELD: chemistry.

SUBSTANCE: filter is made of nonwoven fabric and/or injected filter structures or sheets, i.e. produced after processing the synthetic artificial fibres. At first fibres are processed with antibacterial compounds and sliced to monothreads. Natural, artificial, synthetic, metal fibres or their mixtures are used. Web and felt are formed from these threads. Required number of nonwoven fabric layers is connected, thereafter processed, sliced and rolled.

EFFECT: extended application of aforesaid filters, improved wetting and filtering ability ensured.

31 cl, 16 dwg, 11 ex

FIELD: textile.

SUBSTANCE: invention concerns fabric applied together with melting interconnection machine for obtaining, transporting and interconnection of panels to form non-woven fabric. Non-woven fabric device includes: nozzle for thread curtain generation, diffuser, which forms, extends and sprays fiber onto forming fabric, reduction device for thrown-down fiber forming a panel, article or structure. In addition, the said forming fabric can be applied together with melting machine and comprises woven fabric with flat threads lined across the stream of fabric machine or flat threads lined along the stream of fabric machine. These threads decrease the air volume in forming fabric and smooth the surface of forming fabric.

EFFECT: decreased air leak during interconnection; eliminated instable vibration of panel.

12 cl, 5 dwg

FIELD: technology of polymers.

SUBSTANCE: invention relates to technology for preparing fibers, in particular, polypropylene fibers from nonwoven materials from a melt. Fiber is made from propylene polymeric composition (A) showing the melt flow rate value MFR (1) 6-150 g/10 min. The composition is chosen from group comprising the following components: (i) crystalline propylene polymeric composition comprising at least 0.8 wt.-% of ethylene, melting point 155°C or above, xylene-soluble fraction at room temperature, less 10 wt.-%, and the ratio index of polymeric fraction collected at temperature 25-95°C, and xylene-soluble fraction at temperature above 4; and (ii) crystalline propylene polymeric fraction with a boiling point 153°C and above, the content of xylene-soluble fraction at room temperature less 10 wt.-%. Indicated composition comprises at least 0.64 wt.-% of ethylene and/or (C4-C10)-α-olefin structural unit and comprises the following components: (I) 20-80% of crystalline propylene polymer comprising up to 1.5 wt.-% of ethylene and/or (C4-C10)-α-olefin, and (II) 20-80% of crystalline propylene statistic copolymer chosen from group comprising the following components: (IIa) propylene copolymer with 0.8-10 wt.-% of ethylene and/or (IIb) propylene copolymer with 1.5-18 wt.-% of (C4-C10)-α-olefin. Indicated polymeric composition (A) is prepared by chemical degradation of the previous polymer composition (A) showing the melt flow rate values MFR (2) from 0.5 to 50 g/10 min under condition that the melt flow rate ratio MFR (2) = 1.5-60. Prepared fibers are designated for preparing nonwoven materials used as interweaving material and ornamented fabric.

EFFECT: improved preparing method, valuable properties of fibers.

10 cl, 11 tbl, 15 ex

Multilayer material // 2318935

FIELD: textile industry, in particular, manufacture of wide range of articles ranging between lacework and carpet articles.

SUBSTANCE: multilayer material has at least two interconnected layers, each made from threads of preferably pile yarn, with predetermined laying pattern of threads in layer. Layers are offset relative to one another so as to define angle of 1-90 deg between adjacent threads through thickness of material and connected with one another through fibers extending from one layer into another layer or fibers of layers extending through each other (by needle stitching). Said layers have various thread laying density and various handle of laid yarn. Needle is stitched at one and/or two sides. For manufacture of coat, material having 100%-wool is used as pile yarn, said wool having linear density of 0.75 tex. Material may contain at least one layer of fabric or leather.

EFFECT: wider range of materials and articles produced from said materials and featuring increased comfort and prolonged service life combined with high artistic and ornamental properties.

3 cl, 5 dwg

FIELD: production of non-woven textile materials based on chemical filaments, and organosilicone preparation used as adhesion promoting agent.

SUBSTANCE: method involves applying organisilicone preparation onto filament; drying and forming fibrous cloth, followed by thermal pressing. Organosilicone preparation used in process is alcoholic solution or aqueous emulsion of vinyltriethoxysilane or oligovinylethoxysilane, said components being used in the following ratio: vinyltriethoxysilane or oligovinylethoxysiloxane 1.00-10.00; surfactant 0.05-0.5; ethyl alcohol and/or water the balance. Drying process is performed at room temperature. Hydrogen peroxide is applied at cloth formation stage. Thermal pressing of fibrous cloth is carried out at temperature approximating fiber polymer flow temperature and under pressure of 20·105 Pa during 0.02 s.

EFFECT: provision for producing of non-woven textile material with higher strength characteristics, air-permeability, elasticity, improved crease-resistance and higher resistance to wet processing and washing.

FIELD: production of non-woven textile materials based on chemical filaments, and organosilicone preparation used as adhesion promoting agent.

SUBSTANCE: method involves applying organisilicone preparation onto filament; drying and forming fibrous cloth, followed by thermal pressing. Organosilicone preparation used in process is alcoholic solution or aqueous emulsion of vinyltriethoxysilane or oligovinylethoxysilane, said components being used in the following ratio: vinyltriethoxysilane or oligovinylethoxysiloxane 1.00-10.00; surfactant 0.05-0.5; ethyl alcohol and/or water the balance. Drying process is performed at room temperature. Hydrogen peroxide is applied at cloth formation stage. Thermal pressing of fibrous cloth is carried out at temperature approximating fiber polymer flow temperature and under pressure of 20·105 Pa during 0.02 s.

EFFECT: provision for producing of non-woven textile material with higher strength characteristics, air-permeability, elasticity, improved crease-resistance and higher resistance to wet processing and washing.

FIELD: equipment for manufacture of web of non-woven material from single thermoplastic filaments.

SUBSTANCE: apparatus has spinneret, cooling chamber, pulling unit, and unit for laying of filaments for producing of web. Two or more polymer melts may be fed to spinneret. Apparatus is further provided with device for feeding of various polymer melts so that bicomponent or multiple-component filaments are delivered through spinneret opening. Cooling chamber is divided into at least two sections where bicomponent or multiple-component filaments are brought into contact with process air at different convective heat discharge capacity.

EFFECT: increased efficiency in directed adjustment of filaments properties and, accordingly, characteristics of non-woven materials produced.

11 cl, 6 dwg

FIELD: physics.

SUBSTANCE: invention suggests single fibre with longitudinal orientation of grooves and fabric made of it. Two-component fabrics made of these single fibres with grooves with use of blanket grout or cable coating have improved adhesion of coating; they also can include conductive coating. Besides, two-component single fibres can include mechanism indicating wear and tear. Invention also describes grooves made in surface of single fibres. In comparison with round single fibres improved adhesion with coatings is advantage of single fibres with grooves. Besides, fabrics containing these single fibres with grooves have better air management properties. Single fibres with grooves can be contained in fabric as threads laid in machine direction, in cross direction and both in machine and cross directions.

EFFECT: less air penetration, this is attained without additional coating or filling by thread.

33 cl, 18 dwg

FIELD: machine building.

SUBSTANCE: invention is related to the field of synthetic materials production from thermoplastic substances and their mixtures, including high quality stocks of raw materials and different types of household and industrial wastes of thermoplastic materials, and may be used for production of sorbents that entrap oil and oil products from water. Device for production of fibre material comprises extruder, nozzle of melt supply with heating elements, fibre generator. Fibre generator is arranged in the form of nozzle, compressed air supply duct is tangentially fixed to its body. Fibre generator is equipped with mouthpiece, outlet opening of which is located in the same plane with outlet opening of fibre generator. Nozzle for melt supply is equipped with heating elements installed coaxially around nozzle and at the same distance from each other. Flat ribs or cylindrical rods installed in staggered order along nozzle perimeter at the same distance from each other are located inside the nozzle. In order to improve heat emission and mixing, helical rib may be installed inside the nozzle.

EFFECT: simplification of design and increase of device efficiency and reliability.

2 cl, 5 dwg

FIELD: textiles, paper.

SUBSTANCE: invention relates to technology of synthesised fibres production, in particular, to manufacturing of the product similar to monofibre. The method involves exposure of the predecessor containing an assemblage of endless elementary polyolefine fibres to temperatures within the range of polyolefine melting temperature for a period of time sufficient for, at least, a partial melting of adjacent fibres. Simultaneously drawing of the predecessor is carried out up to extent of drawing equal to at least 2.8.

EFFECT: manufacturing of the product similar to monofibre which demonstrates improved drawability that makes it suitable for such a sphere of application,as, for example, fishing line.

6 cl,1 tbl, 3 ex

FIELD: mechanics.

SUBSTANCE: spinner reel mechanism incorporates a casing, a reel, a shaft, a driver gear wheel and nuts. The casing, reel and drive gear wheel are made in chemically resistant composite self-lubricating material with a polymer matrix. Note that the casing functions as a plain bearing and a packing in the shaft-casing friction pair. The reel is made from one blanket of the aforesaid material.

EFFECT: longer life, ruling out formation of corrosion products and negative effect on chemical fibers.

5 dwg

FIELD: textiles, paper.

SUBSTANCE: invention relates to the technology used in production of pack thread from polyethylene terephthalate. Liquid polyethylene terephthalate, possibly from used beverage bottles, is etxruded at between 250 and 300°C through a slit draw plate. The obtained layer is cut into strips and subjected to phased thermal treatment with stretching. The stretched layer is fibrillated and intertwined into a pack tread using well known methods. The obtained thread with density of 2200 tex, has a rapture strength of up to 100 kgf at 2.2 mm thickness, and long service life even in harsh winter conditions.

EFFECT: increased strength and service life of the polyethylene terephthalate pack thread.

3 cl, 2 tbl, 2 ex

Spinning method // 2318930

FIELD: process for spinning of complex thread and products manufactured by said process.

SUBSTANCE: method for spinning of complex thread from thermoplastic material involves providing extrusion of melted material through spinneret having multiplicity of spinning openings for forming bundle from multiplicity of fibers; winding fibers for producing of thread after hardening; performing two-staged cooling of fiber bundle under spinneret, with first stage including directing gaseous cooling medium flow in first cooling zone through fiber bundle in transverse direction so that essentially full exit of cooling medium from fiber bundle is provided at side opposite to side where cooling medium is introduced, and second stage including additional cooling of fiber bundle in second cooling zone positioned under first cooling zone essentially through self-suction of gaseous cooling medium surrounding said fiber bundle.

EFFECT: increased cooling extent of formed fibers and, accordingly, improved quality of produced fibers.

14 cl, 3 tbl

FIELD: processes for producing of synthetic, in particular, high-strength, polypropylene fibers.

SUBSTANCE: method for producing of fibers having minimal thickness, strength exceeding 6 sN/decitex and elongation less than 40% involves forming cords from melt having low temperature, in particular less than 250 C; discharging said cords at relatively low feeding speed which is less than 100 m/min, and simultaneously cooling said cord using gaseous cooling medium; subjecting cords to stretching in at least three stretching stages at total stretching ratio of 4:1. At first stretching stage, cord partial stretching degree is at least 70% by total stretching degree. After termination of stretching procedure, cords are cut into polypropylene fibers. Also, apparatus for manufacture of high-strength polypropylene fibers is described. Method allows thin fibers with single filament titer less than 2 decitex to be produced.

EFFECT: increased efficiency in producing of polypropylene fibers having minimal thickness and elongation degree and maximal strength.

15 cl, 2 dwg

FIELD: textile and chemical industry, in particular, noise-absorbing guard for textile machines.

SUBSTANCE: unit for producing of high-strength viscose cord has mechanism for blocked lifting of encapsulation shield and forced drawing ventilation valve, air duct for forced drawing ventilation equipped with valve, air duct for removal of air-vapor mixture from first plasticizing bath pipes, encapsulation shield positioned at side where thread is formed, transverse and longitudinal partitions, thread forming set of equipment, air duct of permanently functioning drawing ventilation system and encapsulating shield positioned at side where drawing, collecting and transportation of thread are performed. Each of encapsulation shields has carcass formed as parallelepiped defined by front and rear walls of panel, each made U-shaped. There is slit-type perforation on front wall, with perforation coefficient being accepted equal to or exceeding 0.25. Panel walls are fixed with respect to one another by means of vibration damping covers. Noise-absorbing material of noise-damping members is made in the form of plate made from basalt-base mineral wool, or mineral wool, or basal wool, or glass wool with glass wool facing, or foamed polymer such as polyethylene or polypropylene. Noise-absorbing member is faced over its entire surface with acoustically transmitting material.

EFFECT: increased efficiency in reducing of noise level and increased efficiency of unit.

8 cl, 3 dwg

FIELD: textile and chemical industry, in particular, noise absorbing guards for spinning machines.

SUBSTANCE: spinning machine for staple viscose textile fiber comprises two single-sided spinning machines with sections at each side, and has set of fiber forming equipment, encapsulating shield, mechanism for blocked lifting of shield and enhanced suction valve, enhanced suction air tube, valve with hydraulic gate, and permanent suction air duct. Internal vibration isolation system for spinning machine has flexible members made from solid elastomer or wood. Vibration isolation system for frame of machine has flexible members extending along edge of machine to join said frame with foundation block. Rigidity of internal isolation flexible members of machine exceeds by 3-5 times the rigidity of flexible members joining machine frame to foundation block.

EFFECT: increased efficiency in reducing of noise volume and increased capacity of spinning machine.

4 cl, 3 dwg

FIELD: textile and chemical industry, in particular, noise absorbing guards for spinning machines.

SUBSTANCE: spinning machine for viscose textile threads comprises set of spinning equipment, space formed under capsule, encapsulating shields, permanent and enhanced suction air pipes. Each of encapsulation shields has carcass formed as parallelepiped defined by front and rear panel walls, each of which being made U-shaped. Slit-type perforation is provided on front wall, with perforation coefficient being accepted as equal to or exceeding 0.25. Panel walls are secured to one another by means of vibration damping covers. Sound absorbing material of sound absorbing member is made in the form of plate from basalt-base mineral wool, or mineral wool, or basalt wool, or glass wool faced with glass felt, or foamed polymer such as polyethylene or polypropylene. Sound absorbing member is faced over the entire surface thereof with acoustically transmitting material.

EFFECT: increased sound volume reducing efficiency and enhanced capacity of spinning machine.

4 cl, 3 dwg

FIELD: equipment for cooling of polymer molded threads.

SUBSTANCE: apparatus is adapted for cooling of threads delivered from spinnerets of spinneret set positioned in spinning shaft. After molding of threads from polymer melt, threads are drawn downward and wound. Cooling pipe connected to spinneret set is made perforated to form sieve for passage of cooling air from the outside into inside. Threads may be drawn through said cooling pipe. Cooling pipe 4 includes at least one pipe 7 perforated to form sieve and adapted for admission of cooling air. At least one adjustable closing ring 9 is arranged on inner or outer side of perforated sieve-like pipe 7 for preventing cooling air from discharge.

EFFECT: fast and effective coordination of cooling pipe with thread cooling conditions.

3 cl, 3 dwg

Up!