SU941435A1 - Process for drying fibrous material - Google Patents

Description

(St) METHOD FOR DRYING FIBER MATERIAL

one

The invention relates to the cotton-cleaning industry, in particular to methods of cleaning and drying raw cotton during its processing and can be used in cotton-cleaning plants.

There is a method of drying a fibrous material by forming a layer of material and placing it on a perforated inclined surface, followed by blowing the layer with a stream of drying agent.

 The disadvantage of this method is low processing efficiency of raw cotton and physico-mechanical damage to cotton fiber, i.e. the occurrence of knots and other defects in the drying process.

The aim of the invention is to reduce the malformation in the fiber and improve the efficiency of drying raw cotton.

This goal is achieved in that according to the method of drying the fiber.

including forming a layer of material and placing it on a perforated inclined plane, followed by blowing the layer with a stream of drying agent, periodically withdrawing this surface from the layer of material to form an air cushion between them and then returning it to its original position at a speed less than the rate of removal from the layer.

The fibrous layer is formed with a density of 80-100 kg / m, and the height of the layer is maintained within 250-300 mm.

FIG. 1 to 3 show the steps of the drying process; FIG. k is the motion path of the bearing surface.

The proposed method is carried out as follows.

Claims (2)

The mass of raw cotton, at the moment it is fed into the dryer, compresses and forms into a layer with a density of 80-100 kg / m on a propeller in the form of an inclined perforated surface, each of which moves along the path shown in FIG. 4, i.e. along the curve, which is a closed loop with a horizontal rectilinear part, and the speed and acceleration of the propeller in different parts of the trajectory have different values. Thus, in the straight-line section O, a uniform movement is observed, where the speed is equal to 20-30 cm / s, in section G, uniformly accelerated, downward movement, and in the section, equidistant up. In the first stage (Fig. 1), the layer of material moves in a straight line, and then, when the propeller abruptly changes direction and moves evenly downward, the layer of material hangs above the propeller, forming a certain gap with the surface of the propeller (airbag 7, which enters through the perforations drying agent supplied with a certain initial pressure under the lower part of the propeller, i.e. the drying agent is sucked into the space between the raw cotton layer and the perforated propeller. At the moment the propeller moves immediately back to the starting position (back up), the gap between the raw cotton layer and the propeller decreases to complete disappearance and the dry agent penetrates the layer of the material at even higher speeds due to the pressure of two surfaces and the excess pressure of the drying agent itself propulsion. The necessity of imparting different speeds and accelerations in each separate part of the propulsion path is explained by the following: in the first part Q the uniform speed is necessary to exclude The displacement of the bottom layer of cotton and the mover in the second section of the vehicle requires a uniformly accelerated motion so that the mover can quickly tear off the underside of the cotton layer and both bake the suction into the resulting gap of the drying agent through the holes in the mover perforation, in the third section equal motion is necessary to eliminate the possibility of disintegrating the layer of raw cotton, which can occur if the layer and the projectile approach each other abruptly. 4 At the same time as the drying process, the free fines are separated from the raw cotton and fall onto the surface of the mover, and then are removed down through its openings. In general, there is a process of layered movement of raw cotton, in which there is no relative movement between the surface of the propeller and the layer of raw cotton, but transfer of raw cotton by a perforated propeller for a certain distance and detachment from it with simultaneous pulsating processing of the material with a drying agent. At the same time, the same point of the driver touches and transfers in each cycle new parts of the layer of raw cotton, without causing the fiber to hurt, to form knots, i.e. excluding mechanical damage and preserving the natural qualities of the fiber. Example. The raw cotton passing through the feeder and sealing rollers, the density of which is in the range of 80-100 kg / m, is fed to a perforated propulsor with a layer height of 250-300 mm. The propeller moves along a closed path, in which the section ti corresponds to 60-120 mm, with a frequency of 50-80 cycles per minute. The layer of raw cotton carried by the propeller is filtered by the drying agent supplied under the propulsion unit, the drying agent streams passing through the perforation holes of the propulsion unit from the openings not perpendicular to the propulsion plane, but at an angle of 60-So C to it in the direction of the layer movement. raw cotton, which additionally contributes to the advancement of a layer of raw cotton in the desired direction. In the process of moisture extraction by the drying agent, according to the measure of movement of a layer of raw cotton, fine litter is released. Thus, the proposed method uses the most efficient drying method - layered, which has a significant advantage over other types of drying of raw cotton, in which the movement of the material is carried out by a special method that eliminates any friction between the metallic parts and cotton fiber, which eliminates such highly undesirable phenomena (pinching, nodulation and increase of defects in the fiber), while preserving the natural qualities of cotton fiber. Claim 1. A method of drying a fibrous material by forming a layer of material and placing it on a perforated inclined surface followed by blowing through a stream of drying agent, characterized in that, in order to increase the efficiency of the process by reducing the formation of blemishes in the fiber, 56 perforated surface from the layer of material to form an air cushion between them and then return it to its original position at a speed lower than the rate of removal from the layer . 2. The way pop. 1, I differ by the fact that the fibrous layer is formed with a density of 80100 kg / m, and the height of the layer is maintained within 250-300 mm. Sources of information taken into account during the examination 1. USSR author's certificate N ° 436897, cl. D 01 B 1L8, 1972. /) j о «/ V /.V/-V 1 - FIG.