Method of producing needle-punched silica thermal barrier materials and technological line for its implementation

FIELD: textiles, paper.

SUBSTANCE: in the method for manufacturing needle-punched silica thermal barrier materials comprising preparing a fibrous mixture, forming fibrous web with aerodynamic method and formation of needle-punched web as feedstock, the silica fibers with the diameter of 5-7 microns and 8-20 microns are used or their mixture in a ratio of (10-90):(90-10)% which are divided in fibers on serrated drum, forming a fibrous web is carried on a conveyor of web-forming machine due to combining aerodynamic and mechanical methods. Then, the resulting fibrous web is subjected to the action of the needle board of the needle-punching machine equipped with percussion needles with serrations in both forward and reverse directions, forming the needle-punched web of thickness 3.0-10.0 mm is carried out per one process cycle, and forming of needle-punched web of thickness 12.0-30.0 mm - in two stages. First the webs-blanks are made with preliminary percussion in two directions per one pass of the web through the needle-punching machine. Then the webs-blanks are folded to the desired thickness followed by final punching in two directions per one pass through the needle-punching machine, the formed nonwoven needle-punched web enters the device of cutting and winding, and the silica fibers have a porous structure with pore size of 3-10 A (angstroms) and the production line for production of needle-punched silica thermal barrier materials, comprising a device of mixing fibrous mass, a feeding conveyor, a web-forming unit, a needle-punching machine which has a table with a needle board and with needles fixed on it. At that the percussion needles fixed to the needle board, are made with serrations in the forward and reverse directions. Moreover, the number of rows of needles with serrations in the forward direction located at the inlet to the needle board, is 2-3 times greater than the number of rows of needles in reverse direction of serrations disposed in the final part of the needle board and the two-sided percussion of web (from up to down and from the bottom up) is carried out per one technological progress of the needle in one needle-punching machine, percussion needle size and serrations is proportional to the diameter of the silica fiber.

EFFECT: use in the production of silica fibers.

4 cl

 

The invention relates to the textile industry, in particular, to the production of non-woven heat-paintings (mats), which can be used for thermal insulation in military and space technology, high-temperature units, for the coating of heat-treatment furnaces for thermal insulation of domestic heating devices for filtration of liquid metals and alloys and for sound insulation.

Thermal insulation materials (mats) are made in the form of nonwoven material bonded together by hypoproteinemia silica fibers with a diameter of 5 to 20 μm. This nonwoven material is a three-dimensional structure with a thickness of 3 to 30 mm

Known mats of glass fibers of different chemical composition. However, it is important to obtain needle-punched mats from silica fibers, which have a fundamental difference in structure from all known glass fiber: silica fibers have a porous structure, low density and low thermal conductivity.

A known method of manufacturing a non-woven needle-punched material (A.S. USSR №1694738, CL D04H 1/48, 1978) is similar, including the formation of the canvas, of synthetic fibers, prior to its bonding, hydration and final hardening by hypoproteinemia.

The disadvantage of this method is that Yes the tion method does not provide deep loosening, that allows you to get a canvas of elementary fibers, and formed the unevenness in thickness along the width of the canvas.

A known method of manufacturing a non-woven cloth (RF patent No. 2073756, CL D04H 1/46, 1997) - analogue containing a preparation of raw materials, mixing, oiling, Rossiyane, the formation of the canvas and stitching canvas by igloprobivnye before the formation of non-woven cloth.

The disadvantage of this method is that when this method is used 2 or 3 needle machine, which condense and bind the canvas needles with notches, which is uneconomical.

The closest to the proposed method according to the technical nature of a mode of production duplicated carpet Ecopol (RF patent No. 2263169, CL D04H 11/00 - 2004 .) prototype containing the preparation of the fibrous mixture replicale-blended aggregate, where the processes of loosening and mixing of the fibers forming the fibrous canvas, obtaining a multilayer fibrous canvas with chaotic arrangement of fibres and the transformation of the canvas in the canvas on the needling machine.

The disadvantage of this method is that the binding of the fibers used in this method cannot provide a uniform canvas width.

A device for obtaining the nonwoven fabric of mineral and silicate ox is con (RF patent No. 2074913, CL D04H 1/46, 1997 - prototype)containing dialnow machine with removable drum, a horizontal shaft site aerodynamic hollofibre with two perforated drums, on which is formed fibrous canvas. With perforated drums formed the canvas is removed removable rollers and is fed to the conveyor needle machines, where multiple hypoproteinemia is his bond and seal. Then the resulting intermediate product is fed to the second needle machine for final hypoproteinemia.

The disadvantage of this device is that the resulting fabric has a maximum thickness up to 6 mm and for receiving the fabric used two needle machine.

To obtain needle-punched panels of porous silica fiber was assumed use of standard equipment, which is used to obtain needle-punched panels of glass and synthetic fibers a solid structure. However, its application to obtain panels of porous silica fibers was impossible.

The technical result of the present invention is to create a thermal insulation material made of silica fibers having a porous structure, the receiving blade thickness of 3-30 mm and in the stewardship process.

Attrasoft is achieved by a method for production of needle punched silica heat-shielding material, comprising preparing a fibrous mixture, the formation of fibrous canvas aerodynamic method and the formation of needle-punched fabrics as feedstock use silica fiber with a diameter of 5-7 microns and 8-20 μm or their mixture in the ratio (10-90):(90-10)%, which razvorotnaya serrate on the drum, the formation of fibrous canvas carry on the conveyor hollaforum machine due to combination of aerodynamic and mechanical methods, and the resulting fibrous canvas is exposed to the needle boards needle machine, equipped with piercing needles with notches in the forward and reverse directions, the formation of needle-punched fabric with a thickness of 3.0-10.0 mm are produced in one process cycle, and the formation of needle-punched fabric thickness of 12.0-30.0 mm in two stages: 1) first, make a cloth - procurement with pre-punched hole in two directions in one pass of the blade punched through the machine; 2) then make the addition of paintings-blanks to the required thickness with subsequent final punching in two directions in one pass through the needling machine, formed of non-woven needle-punched fabric is fed to the cutting device and the winding, and the flint is slightly fibers have a porous structure with a size of pores 3-10Å (angstroms), and the technological line for production of needle-punched silica heat-shielding materials containing a stirring device fibrous mass, the supply conveyor, the node hollofibre, needle machine having a table with the needle Board and fixed thereto needles, with piercing needles mounted on the needle Board, made with notches in the forward and reverse directions, and the number of rows of needles with notches in the forward direction, located at the entrance to the needle Board, 2-3 times more than the number of rows of needles with a reverse direction of the notches located in the final part of the needle Board, and two-way punching blade (from top to bottom and from the bottom up) is one of the technological progress the needle boards in a single needle machine, the size of the piercing needle and chipping proportional to the diameter silica fiber.

Production line contains:

Feeder-the Ripper (I) aerodynamic hollaforum machine, combined with the Converter webs (II); needle machine (III), the device for cutting and coiling (IV). The line provides a process for obtaining the nonwoven thermal insulating materials from shtapelirovannojj silica fiber to roll.

The drawing shows a production line for the production of needle punched silica is s thermal protection materials, which contains the following nodes:

I. Feeder-Ripper-mixer;

1 - feed conveyor feeder-mixer;

2 is an inclined spiked lattice feeder-mixer;

3 - razravnivaya lattice feeder-mixer;

4 - removable drum feeder-mixer;

5 - air tube;

II. Hostformat machine

6 - top condenser hollaforum machine;

7 - removable drum:

8 is a vertical hopper;

9 - feeding a pair of shafts of the machine;

10 - supply cylinder;

11 - feed table;

12 - discretetime drum;

13 - mine;

14 - the lower drum condenser;

15-sealing platen;

16 - Converter webs.

III. Needle machine

17 - perforated cleaning table;

18 - perforated lining the table.

19 punch Board with needles;

IV. The device for cutting-winding:

20 - rolling shafts.

Method for the production of needle-punched silica materials is as follows.

Example 1.

In the production of needle-punched silica heat shield materials as feedstock use silica fiber with a size of pores 3-10A (angstroms).

Preparation of fibrous raw material is weighed certain portions of silica fibers with a diameter of 5 μm. The mixture according to the method of forming the so-called the second "bed" of the fibers, weigh a certain portion of a certain type of fiber and placed on the supply conveyor (I) feeder-Ripper-mixer (1) with a thickness of 200-300 mm

With the supply conveyor (1) the resulting material is passed onto the sloping grate (2), needle which capture pieces of fibrous material and transfer them from the power grid on razravnivaya (3). Needle razravnivaya lattice, moving towards the needles inclined grating (2), take away the large pieces into smaller ones, which are then dumped with removable drum (4) in the receiving part of pneumotropica (5) for transporting them to hollaforum machine (II). Quality loosening the fibers in the hopper-feeder depends on the density and humidity of the processed fiber from the speed control slant needle lattice and the supply conveyor and the change of spreading between razravnivaya and needle bars.

Loosened and peremeshennoi in feeder-Ripper fibre pneumonology (5) is condenser (6) hollaforum machine (II), which is reset removable drum (7) in the hopper (8). Loading hopper (8) carry out periodically and monitor the device supports the specified level of fiber in it. After reaching a certain level of fibers in the hopper perform the following operations: the fibrous layer from the hopper, possessionary feeding shaft (9), serves on the supply cylinder (10), then on the supply table (11)around which the fibrous layer will be transmitted in the impact zone discretizing drum (12). In this zone, and there is a decomposition of the pulp into individual fibers, which, falling into the shaft (13), under the influence of the air flow created by the combined aerodynamic and mechanical methods, are deposited on the mesh drum-condenser (14), is formed fibrous canvas and using a rotating sealing roller (15)from shaft (13) fibrous canvas guided on the conveyor Converter webs (16), which is designed to obtain the required thickness and width of the canvas by repeated addition of the primary canvas removed from drum-condenser hollaforum machine.

Fiber canvas, getting punched in the car, exposed to the needle Board, equipped with piercing needles with notches in the forward and reverse directions. Choose the size of the needle and the type of notches depends on the fiber diameter. There are needles in the Board according to the following scheme: piercing needle with a normal (straight) direction of the notches are located in front of the Board. Moreover, their number exceeds the number of punch needle with reverse direction of the notches, located within the PA output from the Board, 2-3 times. In the area of hypoproteinemia canvas nah who is between the perforated cleansing (17) and lining (18) resins and subjected to the punching Board (19), equipped with piercing needles with notches and notch made in the forward and reverse directions, provide two-way punching blade (top-down and bottom-up) in one technological progress needle cases in a single needle machine. Formed non-woven needle-punched fabric (IPP) with a thickness of 3.0-10.0 mm are produced in one process cycle, and the STI thickness of 12.0-30.0 mm in 2 stages: 1)first, make a cloth-procurement with pre-punched hole in two directions in one pass through the needling machine; 2) then make the addition of paintings-blanks to the required thickness with subsequent final punching in two PA-boards in one pass through the needling machine. The obtained non-woven needle-punched fabric is fed to the cutting device and the winding, where the rolling shafts (20) is formed rolls.

Example 2.

Method for the production of needle-punched silica thermal protection materials and production line for its implementation is produced analogously to example 1, but in the quality of raw materials used silica fiber with a diameter of 20 microns.

Example 3.

Method for the production of needle-punched silica thermal protection materials and production line for its implementation is produced analogously to example 1, but in the quality of raw materials used in the t of the mixture of silica fibers with a diameter of 7 μm and 20 μm in the ratio (90-10) %.

Example 4.

The method according to example 1, characterized in that as starting raw material, a mixture of silica fibers with a diameter of 5 μm and 8 μm in the ratio (10-90)%.

1. Method for the production of needle-punched silica heat-shielding material, comprising preparing a fibrous mixture, the formation of fibrous canvas aerodynamic method and the formation of needle-punched fabric, characterized in that the feedstock used silica fiber with a diameter of 5-7 microns and 8-20 μm or their mixture in the ratio (10-90):(90-10)%, which razvorotnaya serrate on the drum, the formation of fibrous canvas carry on the conveyor hollaforum machine due to combination of aerodynamic and mechanical methods, and the resulting fibrous canvas is exposed to the needle boards needle machine, equipped with piercing needles with notches in the forward and reverse directions, the formation of needle punched cloth thickness of 3.0-10.0 mm are produced in one process cycle, and the formation of needle-punched fabric thickness of 12.0-30.0 mm in two stages: 1) first, make a cloth - procurement with pre-punched hole in two directions in one pass of the blade punched through the machine; 2) then make the addition of paintings-blanks to the required thickness with subsequent eye the final punch in two directions in one pass through the needling machine, formed non-woven needle-punched fabric is fed to the cutting device and the winding.

2. Method for the production of needle-punched silica heat-shielding material according to claim 1, characterized in that the silica fibers have a porous structure with a size of pores 3-10Å (angstroms).

3. Technological line for production of needle-punched silica heat-shielding materials containing a stirring device fibrous mass, the supply conveyor, the node hollofibre, needle machine having a table with the needle Board and fixed thereto needles, characterized in that the piercing needle mounted on the needle Board, made with notches in the forward and reverse directions, and the number of rows of needles with notches in the forward direction, located at the entrance to the needle Board, 2-3 times more than the number of rows of needles with a reverse direction of the notches located in the final part of the needle Board, and two-way punching blade (top down and bottom-up) is one of the technological progress the needle boards in a single needle machine.

4. Production line according to claim 3, characterized in that the size of the piercing needle and chipping proportional to the diameter of the silica fiber.



 

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