SU757506A1 - Method of producing fibrous articles - Google Patents

Description

The invention relates to the production of building materials, mainly, to the methods of manufacturing fibrous heat insulating products.

There is a method of forming wood-fiber materials on mesh casting machines ⁵ by feeding pulp pulp through the headbox to a moving metal mesh, spilling the mass with a layer of the required thickness across the entire width of this mesh, dewatering it first with gravitational forces, and then using a vacuum molding machine to acquire strength sufficient to remove the molded material from the grid and feed it to the drying unit (ii.

The disadvantage of this method is the limited service life of metal grids (15-30 days).

The closest to the invention technically "^) solution is a method of manufacturing heat-insulating fibrous products by preparing hydromass, molding, transportation with partial dehydration by

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evacuation of molded products and subsequent drying [2].

When using this method, it is necessary to carry out the evacuation of the grid on its relatively large area for the dehydration of the material on it.

In this case, under the action of a large pressure difference, the material is compacted, clogs the mesh holes, which reduces the filtering capacity of the layer and, consequently, the amount of filtrate. To prevent this phenomenon, the active zone of the vacuum cleaner is increased, which complicates the mesh casting machine and vacuum equipment. Continuous maintenance of the required vacuum is accompanied by large energy consumption.

In addition, the use of this method for molding a carpet, for example, from mineral fiber materials, is ineffective, as a result of adhesion of the carpet to the mesh and increased rigidity of mineral fibers, mechanical damage to the carpet occurs when it is removed from the mesh, which reduces the quality of the molded products.

757506

The purpose of the invention is to increase the strength of products and increase productivity.

This is achieved by the fact that in method ^{1 of} manufacturing fibrous products, including hydromass making, molding, transporting with partial dehydration of molded products and drying, molding and> transporting with partial dehydration is performed on a perforated ₍ surface with simultaneous vibration of 10–40 Hz and amplitude 1.5-5.0 mm oscillations. The technology of the method consists in the following: A pulp containing, for example, a mine, ral fiber, starch, kaolin and water, is fed to a pressure box with an adjustable my chink through which the pulp (mass) flows into the vibratory channel, where it is subjected to vibrations with frequency, amplitude and direction of oscillation, depending on the given material properties and the required thickness of the molded product.

The drawing shows the device used to implement this method. The device consists of a feed hopper 1, a vibration chute in the form of a gutter 2 of rectangular cross-section with a grid 3 rigidly fixed in it, and a vibration drive 4. For pe10

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15

25

gulirovaniya height of the layer of material on the lattice in the vibrating channel provides a sliding gate

5. In the side walls of the gutter there are windows 6 for monitoring the condition and height of the material. . The flow tray in the head part has a solid bottom, which eliminates the preliminary dehydration of the pulp.

Effect; vibration is used for the purpose of uniform distribution of fibers and their desired orientation, which increases the mechanical strength of the molded products.

In the middle and end parts of the tray has a perforated bottom with longitudinal holes, the living section of which increases from the middle to the end of the tray 4 The perforated part of the tray serves to remove water from the mass, flattening the carpet and giving it the necessary structural and mechanical properties. 'Removing water from the mass in the process of vibrating is very intensive, which allows you to use a' tray of a small length and get enough: a high molding speed.

The table shows the values of the moisture content of the material depending on the parameters of the vibration treatment (for 60 s).

Humidity Vibration parameters materiala ΑΙ ~ 5 mm 3ι = 10 Hz A2 = 3 mm 3 ₂ = 20 Hz AZ = 1.5 5h = 40 Hz

Initial (relative)

75% 75%

75%

The ultimate

(relative)

64% 69%

66%

With a longer vibro-processing of the material, its humidity can be reduced to very low values.

The use of vibration for the partial dehydration of the pulp eliminates the use of a moving mesh, which simplifies the design, reduces the consumption of materials, increases the reliability of the installation in operation. The uniform distribution of fibers, resulting in this, increases the mechanical strength of the finished products.

In the process of vibroforming, the material is transported to the tray in a loosened state, which ensures a high filtration capacity of the layer (even of increased thickness).

The absence of a vacuum cleaner simplifies the process equipment, reduces energy costs and reduces the cost of the molding method.

h. Due to intensive dehydration, the speed of the molding process is increased, and, consequently, the installation productivity, so with a carpet width of 640 mm, the installation capacity is 720 m / h.

Claims (1)

Claim A method of manufacturing fibrous products, including the preparation of hydromass, molding, transportation with partial dewatering of molded products and drying, characterized in that, in order to increase the strength of products and increase productivity, molding and transportation. With partial dehydration is produced on a perforated surface while vibration impact hour757506 five Utah 10-40 Hz and "the amplitude of fluctuations of 1.55.0 mm