The method of obtaining sledovanie paper

 

(57) Abstract:

Use: in the manufacture of insulating materials, in particular sledovanie paper, mainly used as insulating spacers, for example, between the slats collectors, insulation of the windings of electrical machines, high voltage cables, etc. object of the invention is to increase productivity and simplification of the manufacturing process sledovanie paper. The inventive sledovanosti paper produced by its formation of alternating fibrous and mica layers on a paper machine with simultaneous layer-by-layer feed fibrous mass and mica slurry on a moving mesh, while the fibrous layer is used as the substrate. 1 C. p. F.-ly.

The invention relates to the production of insulation materials, in particular sledovanie paper, mainly used as insulating spacers, for example, between the slats collectors, insulation of the windings of electrical machines, high voltage cables, etc.

Known fibrous material Nomex M", developed by DuPont, on the basis of aramid fiber, made using the made using proven technologies of paper production and use as a material of the additive fine mica, it provides its relative cheapness. Fibrous base provides high flexibility and mechanical strength, particularly tensile strength.

The disadvantage of this material is relatively low resistance to private discharges and corona discharge related to the fact that the mica flakes are arranged in a fibrous mass of chaotic. High barrier properties of mica paper appear only when continuous mica layer, when the flakes of mica lie parallel to the surface and overlap each other.

A method of obtaining sledovanie paper, where the casting machine of mica pulp molded Sudoplatov paper, which is then impregnated with a binder and bonded to a fibrous substrate of woven or nonwoven fibrous material, in particular, cellulose, polyester, phenylon", fiberglass, etc., [2] there Can be several alternating fibrous and mica layers.

In the wet method of forming a mica sheet mica shimmer pulp on the net flakes of mica in the dehydration of the pulp are parallel to the surface, which provides good barrier properties. Application Sudoplatov paper on voloknam varnish, provides high mechanical strength, particularly tensile strength.

The disadvantages of the known method of obtaining sledovanie material with alternating layers of fibrous and micaceous material are the complexity of the process in General and the poor performance of manufacturing mica sheet related to the fact that the mica layer in the wet state has zero mechanical strength, drying produce on the grid electric and hot air, and not feeding on the drying drum, which limits the speed and thus the productivity of manufacturing. Time-consuming, requiring additional equipment and materials, is the impregnation of the mica layer and bonding it to the substrate.

Known selected as a prototype method for producing sledovanie paper having a substrate of fibrous organic or inorganic material and deposited integrated mica sheet, obtained from small mica flakes, mixed with fibers, such as wood and bonded electrically insulating binder, wherein the integrated mica layer in the form of a sheet is applied to the substrate in the wet state during its Poroi is applied only on the periphery of the sheet, and partly due to adhesion.

The known method provides a simpler and cheaper process connection mica sheet with a fibrous substrate.

The disadvantage of this method is the complexity of the process in General and the poor performance of manufacturing mica sheet material as dehydration and drying are performed directly on the grid without the use of the drying drum.

The objective of the invention is to increase productivity and simplification of the manufacturing process sledovanie paper.

The problem is solved due to the fact that when using the known method of obtaining sledovanie paper by forming alternating fibrous and mica layers, forming as fiber and mica layer is produced on the paper machine by simultaneous multilayer feed fibrous mass and mica slurry on a moving mesh, while the fibrous layer is used as a substrate.

When using the mass of the inorganic fibers in it add organic boomgaarden or binder fiber.

Due to the simultaneous overlap of the fibrous mass and the grid paper machine forming two layers, of which the lower fibrous and serves as a carrier substrate, which progresses the grid is dehydrated and acquires a mechanical strength sufficient to pull in the press section and the dryer, and then kalenderhane. This eliminates the need for the second casting machine and some other devices required for separate forming layers. The use of the press section and the drying drum speeds up the process of manufacturing sledovanie paper. Adhesion between the layers is provided by adhesion, resulting from Sylvania fibers. To increase the strength of paper and improve the quality of the adhesion layer in the inorganic fibrous mass it is advisable to add organic boomgaarden fiber. Due to this excludes the bonding process, thereby simplifying the manufacturing process.

In the proposed method are served in layers not fibrous mass, and two very different components: mica pulp, consisting of thin split mica, and fibrous mass. In addition, the filing of two fibrous masses may intermingling and intertwining Wolna the problem of obtaining sledovanie material is continuous barrier mica layer, which leads to prolonged high dielectric strength of the material in products. Probably confused by the obvious technical solutions and the uncertainty that this decision was not made earlier. It's just the fact, which had to deal with the authors. All professionals mica, and fibrous paper argued that fail layered material of mica, and fibrous masses that the masses in the formation of the sheet will dissolve and penetrate one layer to another, and will receive the option of paper type "Nomex M", developed by DuPont. The second objection specialists will not be contact between the fiber and mica layer, especially if it is an inorganic fiber.

Empirically, the authors are convinced that these, in General convincing arguments, not wealthy. Received paper of sufficient quality, and in contrast to pure mica securities mechanically very resistant strain, perfectly impregnated on the vertical impregnating machines. It should be noted that this is not the only case when practice belies theoretical background. So the opinion that the proposed method has been used for a well-known technique (flow on a moving mesh combine the n blend and penetrate into the thickness is not corresponding layer. In the case sledovanie paper this does not happen, flakes of mica create a continuous barrier layer only of mica flakes, without fibers. They absolutely do not penetrate into the fibrous layer. It was just so unexpected effect, which must be different to the invention.

Due to the characteristics of the technical solution according to the invention, completely solved the problem, the components of the invention.

The claimed technical solution to a set of characterizing features at present is unknown; therefore, it meets the criterion of "novelty."

The claimed technical solution can be carried out industrially using known hardware and materials. The paper has a wide application in electrical engineering, radio engineering, cable engineering and other industries. Therefore, the claimed technical solution meets the criterion of "industrial applicability".

The claimed technical solution describing his signs is the original, giving an unexpected effect that solve multiple problems, formulated the pits of the criterion of "inventive step".

The proposed method consists in simultaneously applying to the grid of the paper machine through the inlet device layer-by-layer feed fibrous mass and mica pulp, which form a separate, not miscible with each other the layers of which the lower fibrous layer plays the role of a carrier substrate. On the grid during the movement of the fibrous mass and the mica slurry is partially dewatered and moist served in the press section, where the pressing of the material, and then to the clothes dryer. When this fibrous material in the wet state acquires a mechanical strength sufficient to transfer material on the drying drum. For additional sealing material and planarization carry out his calendering. To provide increased mechanical strength, for example, when using mica paper instead of not impregnated tapes, mica layer can be cast between the two fibrous layers in the form of cake.

As the fibrous material can be used both organic and inorganic fiber. When using the inorganic fibers in the fibrous mass, it is advisable to add organic bumagoobrazuyuschie car company "Bruderhaus" was made of two kinds of paper from the masses on the basis of aramid fibers and mica pulp ofclassification at a speed of 0.75 cm/s Received cloudvalenta paper at a thickness of 40 μm (20 μm fibrous layer and 20 μm mica layer) had a mechanical strength of 20 N/mm2and electric strength of 25 kV/mm

P R I m m e R 2. On listonline the device was molded double-layer paper of weight on the basis of refractory fibers and phlogopite mica pulp with the addition of 2% carboxymethylcellulose. The obtained samples was loose, so they spray deposited a solution alumacraft density of 1.34 g/cm3after which the samples were Kalandarishvili. When the thickness is 0.3 mm, the samples had the mechanical strength of 5.4 N/mm2and electric strength of 8 kV/mm

P R I m e R 3. On listonline the machine was made of three-ply paper with layers of refractory fibre (mica) refractory fibre with the addition of 3.2% carboxymethylcellulose. After calendering at a thickness of 0.26 mm paper had the mechanical strength of 5.5 N/mm2and dielectric strength of 9.5 kV/mm

P R I m e R 4. Two-layer paper was produced by a firm "Bruckhaus with a substrate layer of glass fiber mass with addition of 5% hibrido of phenylon". At a thickness of 80 μm paper had a tensile strength of 500 m length and e is mistigo fiber with the addition of 5% hibrido of phenylon " and mica pulp, at a thickness of 100 μm had a breaking length of 450 m and a dielectric strength of 5.4 kV/mm

In the process of making all the examples of types sledovanie paper on the paper machine with affected device layer-by-layer feed fibrous mass and mica pulp blending fibers and mica occurred.

The fear of erosion of the fibrous layer of the jet mica pulp was not confirmed. Bonding of the layers was sufficient without the adhesive layer. Flakes of mica was placed parallel to the surface overlap each other, forming a continuous barrier layer. In all cases of practical application sledovanie paper as insulation material delamination did not occur. As can be seen from the examples, cloudvalenta paper had a high mechanical and electrical strength.

In comparison with the known methods of manufacture sledovanie paper the proposed method allows to combine the process of forming layers on a single paper machine, to refuse necessary in the known methods of additional equipment for moulding mica sheet and additional bonding process layers, as well as to accelerate the technology is no increase productivity, as well as to simplify and reduce the cost of the manufacturing process sledovanie paper without deterioration of its quality.

1. The METHOD of OBTAINING SLEDOVANIE PAPER from at least one fiber and one mica layer, wherein the forming of the fibrous layer is produced by applying on a moving mesh paper machine fibrous mass and the connection of this layer is coated on top of him mica is carried out in the process of formation of a fibrous layer, characterized in that simultaneously with the filing of a fibrous mass produce supply mica pulp, forming the specified mica layer.

2. The method according to p. 1, characterized in that when using inorganic fibrous mass in it add organic boomgaarden fiber.

 

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