Study of the Efficiency of Squeezing Moisture-Saturated Products

Abstract

The leather industry includes many technological machines; a squeezing roller machine is used in many operations, for example, in squeezing, degreasing, and after drum dyeing of a semi-finished leather product.
 The paper presents the results of experimental studies obtained by determining the influence of multilayer wet leather semi-finished products with monshons under squeezing on the amount of the moisture extracted. Mathematical dependences of the amount of the moisture extracted, for each layer of a five-layer wet leather semi-finished product on the feed rate between the squeeze rollers and the roller pressure were obtained.
 Experimental research is of scientific and practical importance for the development of a technological process for extracting moisture from wet leather semi-finished products used in the tannery, since the quality of the extraction affects the quality of subsequent technological operations, such as leather shaping and splitting.
 An experimental study was performed using the method of mathematical statistics, namely, the method of mathematical planning of the experiment.
 Mathematical models were obtained for the amount of extracted moisture from five wet leather semi-finished products depending on the rate of their simultaneous feed and the pressure of the squeezing rollers.
 The results of the experiment showed that in squeezing a five-layer product, the productivity of the technological process of extracting moisture from wet leather semi-finished products increases by five times in comparison with existing squeezing roller machines.
 The use of the results of the experimental study will contribute to a significant reduction in the energy consumption of the squeezing roller machine by simultaneous multi-layer processing of wet leather semi-finished products

Experimental dehydration of wet fibrous materials

“…Let us determine the regression coefficients b 0 , b i , bij, b ii from the table given in [22][23][24]. The regression equation in a coded form is: for the first layer of the semi-finished leather product…”

“…The hypothesis about the adequacy of the equations obtained was tested using the Fisher criterion at a confidence level of α = 0.95 [22][23][24] is the variance reproducibility.…”

“…where х is the number of the semi-finished leather products for the experiment, 2500 pieces, n=10 pieces. The strips 0.05×0.25 m from these 10 semi-finished leather products were cut out with a cutter across the spine line and numbered; the strips were assembled into groups of 5 pcs according to the scheme given in [22]- [24]. After that, the stand was turned on, the compression of the springs was calibrated to the desired pressure, an autotransformer controlled the speed, and the clock-type tachometer TCh10Р regulated the rotational speed of the rollers.…”

“…When processing the experimental results, the method of D-optimal planning of the second order was used applying the K. Kano design matrix, which provides the highest accuracy in the estimates of the regression coefficients [22][23][24]. It was taken into account that Kano's design matrix provides for a variety of factors at three levels: lower (-), zero (0), and upper (+) levels, which is appropriate for this study.…”

Selecting Control Parameters of Mechanical Systems with Servoconstraints

“…In [12][13][14], the results of studies on the control of the technological parameters in the process of extracting excess liquid from multilayer moisture-saturated fibrous materials (on the example of leather)are presented. Mathematical dependencies of the amount of extracted moisture for each layer of wet skin on their feeding rate, when supplied between the working shafts rotating at constant angular velocities and their squeezing pressure, were obtained.…”