Features of parameters of a pair of rolls

The structure of finished leather and semi-finished products differ in physical and mechanical parameters. To obtain the properties of elasticity, pliability, and viscosity required in leather production, it is necessary to ensure their values that guarantee the high quality of the resulting product. In this article, a model for finished leather is obtained based on combining the viscoelastic Kelvin model with the deformationinert Khusanov model and the Bingham–Shvedov viscoplastic model. This model makes it possible to improve the elastic-viscous plastic deformation of a fibrous material (leather). The possibility of clarifying the pattern of change in the deformation curve depending on the time the fibrous material is loaded by a certain force was explored. The aim of refining the deformation curve is that in known models, at the initial moment of loading, deformation occurs instantly up to a certain value, which does not fully describe the real physical process of deformation of the material. Consequently, in the proposed refined model, the deformation is fixedat zero value, which provides a real physical pattern of deformation of the fibrous material. The refined model will serve designers of technological machines to develop parameters of deformation during the mechanical processing of elastic-viscous plastic materials.

RETRACTED: Refined model of leather

Bahadirov,

Nabiev,

Tsoy

2024

RETRACTED: Experiments on pressing elastic-viscous products

Bahadirov,

Nabiev,

Tsoy

2024

The effect of various factors on the amount of fluid removed in the technological process of squeezing multilayered raw hides by pressing between plates is experimentally studied in the article. The influence of various factors on the pressing process was determined (for example, the installation of moisture-wicking cloth between the layers of raw hides) and their patterns were established. Results were obtained to determine the effect of moisture-wicking cloth on the efficiency of the process of excess fluid extraction from wet raw hides with the pressure on leather products clamped between the lower and upper plates from 11 to 18 kN/cm2. The installation of fibrous cloth of the BM brand increases the uniformity of fluid removal over the topographic sections of the raw hide, which reduces the storing time after squeezing moisture. The installation of a porous fibrous cloth of BM type between the layers of raw hides eliminates the difficulty of separating the layers of the raw hide. A new method for squeezing out excess fluid from wet raw hides using moisture-wicking cloth by pressing is proposed instead of using metal gratings.

Experımental determination of the breakaway force of working rolls when processing semi-finished products

Nabiev,

Tsoy,

Bahadirov

et al. 2024

The effect of varying the number of layers of a semi-finished product, that is, its thickness, and the pressing force between the working rolls on the breakaway force of a multi-layer package of semi-finished products is experimentally investigated in the article. The dependence of the required breakaway force of the working rolls on the change in the number of layers of semi-finished products supplied for mechanical processing between the working rolls at different pressure forces was experimentally determined. The values of the required breakaway force for the working rolls at the established values of the pressing force of the working rolls for packages consisting of five, ten, and sixteen layers of semi-finished products were obtained.