CN114575176A - Method for manufacturing low-cost pure meta-aramid insulating composite paper - Google Patents

Abstract

The invention discloses a manufacturing method of low-cost pure meta-aramid fiber insulating composite paper, which belongs to the technical field of aramid paper preparation. 60-95 parts by weight of aramid fibrids; two-layer oblique wire lamination; deionized water is used for anilox roll water coating; hot rolling is carried out by means of flat rolling and back rolling in turn. In the present invention, fibrous fibrids are selected as fibrids, and their specific surface area is smaller than that of sheet-membrane fibrids, the water filtration is fast during papermaking, and the speed of papermaking is also faster, which can greatly improve the speed of papermaking; and the present invention adopts Ultra-low concentration slurry, which requires a large amount of dewatering in the forming wire, using a double-stacked wire, and at a sizing concentration of 0.01%-0.02%, a 2-layer inclined wire machine can also ensure sufficient dewatering capacity to make composite paper. The quality of the composite paper; the method of wet rolling is used for hot rolling, the rough paper is humidified with deionized water, and then the wet green paper is hot rolled to make the paper surface high in strength and smooth.

Description

A kind of manufacturing method of low-cost pure meta-aramid fiber insulating composite paper

technical field

The invention relates to the technical field of aramid paper preparation, in particular to a manufacturing method of low-cost pure meta-aramid insulating composite paper.

Background technique

Meta-aramid paper is a paper-like high-temperature resistant material made of meta-aramid chopped fibers and meta-aramid fibrids as raw materials, which are produced by wet lamination and hot rolling. The analyte fibers provide bonding while providing dielectric properties in insulation applications.

Because of its light weight and high strength, high temperature resistance, flame retardant, corrosion resistance and excellent dielectric properties, meta-aramid paper can be widely used as insulating material and honeycomb core material in aerospace, rail transit, electrical and electronic insulation and other fields. Among them, the meta-aramid paper used in the insulation field is divided into two categories: composite paper (A) and pure paper. Composite paper is generally used after compounding it with polyester film (referred to as M), polyimide film (referred to as H or K) or polyphenylene sulfide (referred to as P) to form a structure AM two-layer structure or AMA three-layer structure composite material. It is used in slot insulation, inter-turn insulation, gasket insulation and transformer coil wrapping insulation of motors. At present, there is a complete standard specification for flexible composite materials JB/4061.1-1995. The typical product model of DuPont in this field is T464.

In the application of soft composite materials, aramid composite paper mainly bears the functions of high temperature resistance, tear resistance, wear resistance and increased stiffness, while the requirements for its insulation are relatively low, T464/0.05mm dielectric strength 10Kv/mm- 12Kv/mm has basically met the requirements for use. Compared with the dielectric strength of pure paper T410/0.05mm, which is 17.3Kv/mm, the gap is also relatively large. At the same time, the application of soft composite materials is very wide and the demand is relatively large. In order to gain a foothold in the fierce market competition, such products are positioned as medium-performance and low-cost, so on the basis of maintaining certain performance, cost reduction and efficiency increase become the focus of research and development.

In the manufacturing process of aramid paper, the base paper is generally formed by mixing chopped fibers and precipitating fibers in a certain proportion in an aqueous medium, and then depositing them on the web to form base paper; High temperature hot rolling to form finished paper. Therefore, the speed of papermaking and hot rolling is the key to reducing the cost of composite paper.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a low-cost manufacturing method of pure meta-aramid fiber insulating composite paper, so as to solve the technical problem of high cost of aramid fiber composite paper in the prior art.

The invention provides a manufacturing method of low-cost pure meta-aramid fiber insulating composite paper, comprising the following steps:

Sp1: preparation of raw materials, including 5-40 parts by weight of aramid chopped fibers, and 60-95 parts by weight of aramid fibrids;

Sp1-1: the aramid chopped fiber is a meta-aramid fiber with a length of 6-10mm and a fineness of 1-3 deniers;

Sp1-2: the preparation of the aramid fibrids comprises the following steps:

Sp1-2-1: Prepare low temperature meta-aramid polymer;

Sp1-2-2: prepare coagulation liquid;

Sp1-2-3: The meta-aramid fiber polymer is mixed with the coagulation liquid by entering the precipitator through a nozzle, and subjected to high-speed shearing and stirring, and the mixture is uniform to obtain a precipitating fiber product;

Sp1-2-4: curing the product, and then washing the pulp to obtain the aramid fibrid;

Sp2: Two-layer slanted net copying;

Sp2-1: Disperse and decompose the above-mentioned aramid chopped fiber raw material in water to prepare a aramid chopped fiber slurry with a mass concentration of 0.3-0.8%;

Sp2-2: Disperse the above-mentioned aramid precipitation fiber raw materials in water, grind until the beating degree is 50-650SR, and prepare the aramid precipitation fiber slurry with a mass concentration of 1-2%;

Sp2-3: After mixing the aramid chopped fiber slurry and the aramid fibrid fibrous slurry uniformly in the batching tank, the concentration is 0.01-0.02%, and the slurry is adjusted horizontally through the central sizing device. , Homogenizing flow. The slurry with the same speed and fiber dispersion is fed into the inclined wire headbox, and the slurry is evenly distributed on the two-layer forming wire. The excess slurry overflows to the white pool. When the slurry runs along the forming wire, the Under the action of the dewatering pressure difference, the water is filtered out from the pulp to form a wet paper sheet, and then the wool paper is obtained through the drying cylinder of the paper machine;

Sp3: Anilox roller coating water;

Sp3-1: Prepare deionized water;

Sp3-2: Select an appropriate anilox roller, one side of the anilox roller is fully in contact with deionized water to ensure that the roller surface can absorb deionized water;

Sp3-3: Stick the wool paper on the other side of the anilox roller and apply water while moving;

Sp4: hot rolling;

Sp4-1: Hot rolling the water-coated wool paper by flat rolling:

Sp4-2: Back rolling through the flat rolled wool paper.

Further, in the preparation of the aramid fibrids, the nozzles are set in a square shape, and the nozzles have two types of holes. When preparing the filamentous aramid fibrids, fine circular holes are opened on the surface of the nozzles. ; When the sheet-like aramid fibrid is prepared, slit holes are provided on the surface of the nozzle. Under the existing technology, various domestic and foreign manufacturers have their own methods for producing fibrid The precipitation fibers are a mixture of filamentous fibers and flake-like precipitation, and the thickness is uneven, and the flake-like precipitation fibers affect the papermaking speed. In the present invention, by improving the hole type of the nozzle, the circular resin nozzle is Change it to a square shape, and refine it again on the square nozzle. When making filamentous precipitating fibers, use fine round holes. The number is large to ensure the speed of copying. If the fine round holes are changed to slit holes, the production can be fixed. Film-like precipitating fibers are produced, even if there is turbulent flow in the precipitating machine, the film-like properties of most precipitating fibers can still be guaranteed.

Further, in the preparation of the aramid fibrids, the low temperature meta-aramid polymer concentration is 4-8%, the relative viscosity is 0.8-1.3, and the temperature is controlled at 0-20°C.

Further, in the preparation of the aramid fiber, the prepared coagulation liquid is a mixture of an amide solvent and water, wherein the amide solvent is dimethylacetamide, and the content of the amide solvent in the coagulation liquid is is 20-35%, the temperature of the coagulation liquid is 0-20° C., and the mass ratio of the low-temperature meta-aramid polymer to the coagulation liquid is 1:10-30.

Further, in the preparation of the aramid fibrids, the rotating speed of the high-speed stirring is 4000-7000 rpm.

Further, in the preparation of the aramid fibrids, the curing treatment is to subject the product to a disc mill treatment. The fibrids processed by the disc mill can further stretch and solidify the product.

Further, in the anilox roller coating water, the anilox roller coating water speed is 80-100 m/min, and the humidity range is 10-30%.

Further, in the hot rolling, in the flat rolling step, the pressure of the hot rolling line is 1-5 MPa, the surface temperature of the roll is 180-230° C., and the rolling speed is 15-20 m/min.

Further, in the hot rolling, in the back rolling step, the pressure between the rolls is 0-4MPa, the roll surface temperature is 170-220°C, and the rolling speed is 20-30m/min. The hot rolling process of the present invention adopts the double temperature and double nip process of flat rolling and back rolling. During the flat rolling process, the precipitating fibers are melted and softened by heating at a high temperature, and the water in the nip promotes the soft precipitating fibers to effectively When stretched and wrapped on the surface of chopped fibers, thermal stress forces the distance between fiber molecules to shorten, and the amorphous area is regularly arranged along a certain orientation and enters the crystalline area, resulting in an increase in the crystallinity of the aramid paper; the purpose of back rolling It is to further repair the flat-rolled aramid paper at a slightly lower temperature, so that its internal structure is tighter and the paper surface is smoother and flatter.

Compared with the prior art, the beneficial effects of the present invention are:

First, under the existing technology, under the condition that the basic performance of aramid composite paper is guaranteed to meet the standard, due to its market positioning as medium performance and low cost, cost reduction and efficiency increase have become the focus of research and development, while the speed of papermaking and heat Rolling speed is an effective method to reduce the cost of composite paper. In view of such problems, the present invention designs a manufacturing method of low-cost pure meta-aramid fiber insulating composite paper. Roll coating with water and hot rolling to obtain the finished aramid composite paper. When preparing the raw materials, the fineness of the chopped fibers is generally 2D, 1.5D and 1D, and the length is generally 6mm. , and fibrids use filamentous fibrids, although the structure of aramid paper produced with filamentous fibrids is relatively loose, and the dielectric strength is relatively low, generally 9-12Kv/mm, but this grade The dielectric strength can basically meet the application requirements of composite aramid paper, and its specific surface area is smaller than that of the film-like precipitating fiber, the water filtration is fast during papermaking, and the papermaking speed is also faster, which can greatly improve the papermaking speed; In order to ensure the evenness of the paper sheet, the present invention adopts ultra-low concentration slurry, which requires a large amount of dewatering in the forming wire. Multi-circle, multi-inclined and multi-long nets are used for copying, but when the number of nets increases, it will bring difficulty to operation control and increase the cost. In the present invention, double-stacked nets are selected, and the sizing is 0.01%-0.02%. Concentration, 2-layer slanted wire paper machine to make composite paper can also ensure sufficient dewatering capacity and ensure the quality of composite paper. Through the design of 2-layer forming wire, the slant wire forming machine has the ability of low-concentration and large-flow dewatering and forming. It greatly improves the speed of oblique wire making, and also creates a good process condition guarantee for the good evenness of the paper sheet and the quantification of the width of the paper. The coefficient is low, and the temperature setting of the hot roll is high, generally 275℃-295℃. Although the precipitating fiber melts better in the high temperature range, the edge of the wide paper surface shrinks greatly, which will cause edge wrinkling. At the same time, the whiteness decreases, which affects the appearance of the product. If the wrinkled paper edge is cut off, the loss will increase and the cost will increase. In the relatively low temperature range, although the whiteness of the product increases, the precipitating fiber is not fully melted, and the paper surface is not fully melted. It is easy to fluff, and the present invention adopts the method of wet rolling for hot rolling, moistens the rough paper with deionized water, and then hot-rolls the wet green paper. The glass transition temperature Tg is high. During hot rolling, the precipitation fibers are fully melted, and the paper surface has high strength and is relatively smooth.

Second, under the existing technology, various domestic and foreign manufacturers have their own production methods for fibrid The precipitating fibers that come out are all mixtures of filamentous fibers and sheet-like precipitating fibers, and the thickness is uneven, and the sheet-like precipitating fibers relatively affect the speed of papermaking. In the present invention, by improving the hole type of the nozzle, the circular The resin nozzle is changed to a square type, and it is refined again on the square nozzle. When making filamentous fibrids, fine round holes are used, and the number is large to ensure the speed of copying. If the fine round holes are changed to slit holes, the The film-like precipitating fibers can be produced in a fixed manner. Even if there is turbulent flow in the precipitating machine, the film-like properties of most of the precipitating fibers can still be guaranteed.

Thirdly, in the present invention, the hot rolling process adopts the double temperature and double nip process of flat rolling and back rolling. During the flat rolling process, the precipitant fibers are melted and softened by heating at high temperature, and the water in the nip promotes the soft sinking. The analyte fibers are effectively stretched and wrapped on the surface of the chopped fibers, the thermal stress forces the distance between the fiber molecules to shorten, and the amorphous region is regularly arranged along a certain orientation and enters the crystalline region, resulting in an increase in the crystallinity of the aramid paper; The purpose of rolling is to further repair the flat-rolled aramid paper at a slightly lower temperature, so that its internal structure is tighter and the paper surface is smoother and flatter.

Description of drawings

In order to illustrate the specific embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the specific embodiments or the prior art. Obviously, the accompanying drawings in the following description The drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

Fig. 1 is the schematic flow chart of the present invention;

Fig. 2 is the structure schematic diagram of filamentous precipitating fiber nozzle in the present invention;

FIG. 3 is a schematic diagram of the hot rolling process in the present invention.

Reference number:

1. Thin round hole; 2. Slit hole; 3. Shearing knife.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments.

The components of the embodiments of the invention generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention.

Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

1 to 3, an embodiment of the present invention provides a method for manufacturing a low-cost pure meta-aramid fiber insulating composite paper, including the following steps:

Sp1: preparation of raw materials, including 5-40 parts by weight of aramid chopped fibers, and 60-95 parts by weight of aramid fibrids;

Sp1-1: Aramid chopped fiber is a meta-aramid fiber with a length of 6-10mm and a fineness of 1-3 denier;

Sp1-2: The preparation of aramid fibrids includes the following steps:

Sp1-2-1: Prepare low temperature meta-aramid polymer;

Sp1-2-2: prepare coagulation liquid;

Sp1-2-3: The meta-aramid fiber polymer enters the precipitator through the nozzle and mixes with the coagulation liquid, performs high-speed shearing and stirring, and mixes evenly to obtain the fibrous product;

Sp1-2-4: solidify the product, and then wash the pulp to obtain aramid fibrids;

Sp2: Two-layer slanted net copying;

Sp2-1: Disperse and decompose the above-mentioned aramid chopped fiber raw material in water to prepare a aramid chopped fiber slurry with a mass concentration of 0.3-0.8%;

Sp2-2: Disperse the above-mentioned aramid precipitation fiber raw materials in water, grind until the beating degree is 50-650SR, and prepare the aramid precipitation fiber slurry with a mass concentration of 1-2%;

Sp2-3: After mixing the aramid chopped fiber slurry and the aramid fibrid fibrous slurry uniformly in the batching tank, the concentration is 0.01-0.02%, and the slurry is adjusted horizontally through the central sizing device. , Homogenizing flow. The slurry with the same speed and fiber dispersion is fed into the inclined wire headbox, and the slurry is evenly distributed on the two-layer forming wire. The excess slurry overflows to the white pool. When the slurry runs along the forming wire, the Under the action of the dewatering pressure difference, the water is filtered out from the pulp to form a wet paper sheet, and then the wool paper is obtained through the drying cylinder of the paper machine;

Sp3: Anilox roller coating water;

Sp3-1: Prepare deionized water;

Sp3-2: Select an appropriate anilox roller, one side of the anilox roller is fully in contact with deionized water to ensure that the roller surface can absorb deionized water;

Sp3-3: Stick the wool paper on the other side of the anilox roller and apply water while moving;

Sp4: hot rolling;

Sp4-1: Hot rolling the water-coated wool paper by flat rolling:

Sp4-2: Back rolling through the flat rolled wool paper.

Under the existing technology, under the condition that the basic performance of aramid composite paper is guaranteed to meet the standard, due to its market positioning as medium performance and low cost, cost reduction and efficiency increase have become the focus of research and development, while the speed of papermaking and hot rolling are the highest. An effective method for reducing the cost of composite paper, in view of such problems, the present invention designs a low-cost manufacturing method of pure meta-aramid fiber insulating composite paper, which comprises the following steps: preparation of raw materials, two-layer oblique wire making, and anilox roller coating with water. and hot rolling to obtain the finished aramid composite paper. When preparing the raw materials, the fineness of the chopped fibers is generally 2D, 1.5D and 1D, and the length is generally 6mm. Filamentous fibrids are used for fibrillar fibers. Although the aramid paper produced with filamentous fibrids has a looser structure and a relatively low dielectric strength, generally 9-12Kv/mm, the dielectric strength of this grade is relatively low. It can basically meet the application requirements of composite aramid paper, and its specific surface area is smaller than that of sheet-like precipitating fibers, and it can filter water quickly during papermaking, and the speed of papermaking is also faster, which can greatly improve the papermaking speed. The evenness of the page, the ultra-low concentration slurry is used in the present invention, which requires a large amount of dehydration in the forming wire part. In the traditional process, it is generally achieved by adding a vacuum dewatering box or increasing the total length of the forming section. Generally, a multi-circle wire mesh is selected. , multi-slanted nets and multi-long nets are copied, but when the number of nets increases, it will bring difficulty to the operation control, and the cost will also increase, and the present invention selects double-stacked nets, under the sizing concentration of 0.01%-0.02%, The use of a 2-layer slanted wire machine to make composite paper can also ensure sufficient dewatering and ensure the quality of composite paper. Through the design of the 2-layer forming wire, the slant wire former has the ability to form low-concentration and high-flow dewatering, which greatly improves the It also improves the speed of oblique wire making, and also creates a good process condition guarantee for the good evenness of the paper and the quantification of the profile. On the other hand, in the traditional hot rolling process, the dry rolling method is mostly used, because the thermal conductivity of the aramid paper is low. , The temperature setting of the hot roll is relatively high, generally 275℃-295℃. Although the precipitation fiber melts better in the high temperature range, the edge of the wide paper surface shrinks greatly, which will cause edge wrinkling and whitening. The quality of the product decreases, which affects the appearance of the product. If the wrinkled paper edge is cut off, the loss will increase and the cost will increase. In the relatively low temperature range, although the whiteness of the product increases, the precipitating fiber is not fully melted, and the paper surface is prone to fluff. In the present invention, the wet rolling method is used for hot rolling, the blank paper is humidified with deionized water, and then the wet green paper is hot rolled, and the water content is used as a plasticizer, which can reduce the vitrification of the aramid paper. Transition temperature Tg, during hot rolling, the precipitating fibers are fully melted, the paper surface strength is high, and it is relatively smooth.

Specifically, in the preparation of aramid fibrids, the nozzles are set to be square, and the hole types of the nozzles are set to two. When preparing filamentous aramid fibrids, fine circular holes 1 are opened on the surface of the nozzles; When the fiber is fibrous, a slit hole 2 is opened on the surface of the nozzle. Under the existing technology, various domestic and foreign manufacturers have their own methods for producing fibrid The precipitation fibers are a mixture of filamentous fibers and flake-like precipitation, and the thickness is uneven, and the flake-like precipitation fibers affect the papermaking speed. In the present invention, by improving the hole type of the nozzle, the circular resin nozzle is Change it to a square type, and refine it again on the square nozzle. When making filamentous precipitating fibers, use thin round holes 1, and the number is large to ensure the speed of copying. If the thin round holes 1 are changed to slit holes 2, then The film-like precipitating fibers can be produced in a fixed manner. Even if there is turbulent flow in the precipitating machine, the film-like properties of most of the precipitating fibers can still be guaranteed.

Specifically, in the preparation of aramid fibrids, the low temperature meta-aramid polymer concentration is 4-8%, the relative viscosity is 0.8-1.3, and the temperature is controlled at 0-20°C.

Specifically, in the preparation of aramid fibrids, the prepared coagulation liquid is a mixture of an amide solvent and water, wherein the amide solvent is dimethylacetamide, and the content of the amide solvent in the coagulation liquid is 20-35% , the temperature of the coagulation liquid is 0-20℃, and the mass ratio of the low temperature meta-aramid fiber polymer to the coagulation liquid is 1:10-30.

Specifically, in the preparation of aramid fibrids, the rotating speed of high-speed stirring is 4000-7000 rpm.

Specifically, in the preparation of the aramid fibrids, the curing treatment is to subject the product to a disc mill treatment. The precipitation fiber treated by the disc mill can further stretch and solidify the product.

Specifically, the anilox roller is coated with water, the speed of the anilox roller is 80-100 m/min, and the humidity range is 10-30%.

Specifically, in the hot rolling, in the flat rolling step, the hot rolling line pressure is 1-5MPa, the surface temperature of the roll is 180-230°C, and the rolling speed is 15-20m/min.

Specifically, in the hot rolling, under the back rolling step, the pressure between the rolls is 0-4MPa, the roll surface temperature is 170-220°C, and the rolling speed is 20-30m/min. The hot rolling process of the present invention adopts the double temperature and double nip process of flat rolling and back rolling. During the flat rolling process, the precipitating fibers are melted and softened by heating at a high temperature, and the water in the nip promotes the soft precipitating fibers to effectively When stretched and wrapped on the surface of chopped fibers, thermal stress forces the distance between fiber molecules to shorten, and the amorphous area is regularly arranged along a certain orientation and enters the crystalline area, resulting in an increase in the crystallinity of the aramid paper; the purpose of back rolling It is to further repair the flat-rolled aramid paper at a slightly lower temperature, so that its internal structure is tighter and the paper surface is smoother and flatter.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. scope.

Claims (9)

1. a manufacture method of low-cost pure meta-aramid fiber insulating composite paper, is characterized in that: comprise the steps: Sp1: preparation of raw materials, including 5-40 parts by weight of aramid chopped fibers, and 60-95 parts by weight of aramid fibrids; Sp1-1: the aramid chopped fiber is a meta-aramid fiber with a length of 6-10mm and a fineness of 1-3 deniers; Sp1-2: the preparation of the aramid fibrids comprises the following steps: Sp1-2-1: Prepare low temperature meta-aramid polymer; Sp1-2-2: prepare coagulation liquid; Sp1-2-3: The meta-aramid fiber polymer is mixed with the coagulation liquid by entering the precipitator through a nozzle, and subjected to high-speed shearing and stirring, and the mixture is uniform to obtain a precipitating fiber product; Sp1-2-4: curing the product, and then washing the pulp to obtain the aramid fibrid; Sp2: Two-layer slanted net copying; Sp2-1: Disperse and decompose the above-mentioned aramid chopped fiber raw material in water to prepare a aramid chopped fiber slurry with a mass concentration of 0.3-0.8%; Sp2-2: Disperse the above-mentioned aramid precipitation fiber raw materials in water, grind until the beating degree is 50-650SR, and prepare the aramid precipitation fiber slurry with a mass concentration of 1-2%; Sp2-3: After mixing the aramid chopped fiber slurry and the aramid fibrid fibrous slurry uniformly in the batching tank, the concentration is 0.01-0.02%, and the slurry is adjusted horizontally through the central sizing device. , Homogenizing flow. The slurry with the same speed and fiber dispersion is fed into the inclined wire headbox, and the slurry is evenly distributed on the two-layer forming wire. The excess slurry overflows to the white pool. When the slurry runs along the forming wire, the Under the action of the dewatering pressure difference, the water is filtered out from the pulp to form a wet paper sheet, and then the wool paper is obtained through the drying cylinder of the paper machine; Sp3: Anilox roller coating water; Sp3-1: Prepare deionized water; Sp3-2: Select an appropriate anilox roller, one side of the anilox roller is fully in contact with deionized water to ensure that the roller surface can absorb deionized water; Sp3-3: Stick the wool paper on the other side of the anilox roller and apply water while moving; Sp4: hot rolling; Sp4-1: Hot rolling the water-coated wool paper by flat rolling: Sp4-2: Back rolling through the flat rolled wool paper. 2. The method for manufacturing a low-cost pure meta-aramid fiber insulating composite paper according to claim 1, characterized in that: in the preparation of the aramid fibrids, the nozzle is set to be square, and the nozzle is There are two kinds of hole types, when preparing filamentous aramid fibrids, open fine circular holes (1) on the surface of the nozzle; when preparing sheet-like aramid fibrids, open slits on the surface of the nozzle hole (2). 3. The manufacturing method of a kind of low-cost pure meta-aramid fiber insulating composite paper according to claim 1, characterized in that: in the preparation of the aramid fibrids, the low-temperature meta-aramid polymer concentration It is 4-8%, the relative viscosity is 0.8-1.3, and the temperature is controlled at 0-20 °C. 4. The manufacturing method of a kind of low-cost pure meta-aramid fiber insulating composite paper according to claim 1, characterized in that: in the preparation of the aramid fibrids, the prepared coagulation liquid is an amide solvent and water mixture, wherein the amide solvent is dimethylacetamide, the content of the amide solvent in the coagulation liquid is 20-35%, the temperature of the coagulation liquid is 0-20 ℃, the low temperature meta The mass ratio of the aramid polymer to the coagulation liquid is 1:10-30. 5 . The method for manufacturing a low-cost pure meta-aramid fiber insulating composite paper according to claim 1 , wherein: in the preparation of the aramid fibrids, the rotating speed of high-speed stirring is 4000-7000 rpm. 6 . 6 . The method for manufacturing a low-cost pure meta-aramid fiber insulating composite paper according to claim 1 , wherein: in the preparation of the aramid fibrids, the curing treatment is to perform the curing process on the product. 7 . Disc grinder processing. 7. The manufacturing method of a low-cost pure meta-aramid fiber insulating composite paper according to claim 1, wherein the anilox roller is coated in water, and the anilox roller is coated with water at a speed of 80-100 m/min, And the humidity range is 10-30%. 8. The manufacturing method of a low-cost pure meta-aramid fiber insulating composite paper according to claim 1, characterized in that: in the hot rolling, under the flat rolling step, the hot rolling line pressure is 1-5MPa, The surface temperature of the roll is 180-230℃, and the rolling speed is 15-20m/min. 9 . The method for manufacturing a low-cost pure meta-aramid insulating composite paper according to claim 1 , wherein in the hot rolling, under the back rolling step, the pressure between the rolls is 0-4MPa, 10 . The roll surface temperature is 170-220℃, and the rolling speed is 20-30m/min.

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