THE INFLUENCE OF COLOUR ON LOSS OF DURABILITY OF KAPRON MATERIAL

Purpose. To substantiate theoretically the optimum safety factors of fishing materials used for the construction of fishing gears that allow reducing the material consumption of these gears and keep them for a long time operation. To select the optimum color of polyamide materials with the lowest loss of strength. Methods. The choice of the materials for the tests was based on the selection of the materials, which are most often used for active and passive fishing gears. Acid dyes were used to dye the materials. Dying was carried out in accordance with the technological instructions. The experiments were conducted at the Department of "Industrial Fishery" of the Kerch Sea Institute. The obtained results of all tests were processed using statistical method of random variables according to Sturges method. Findings. The dying reduces the initial strength of the material by 10% and increases its service life. A relationship was established between the loss of nylon material strength and color as well as insolation time. The lowest loss of strength was observed in materials dyed in brown color. We developed the equations of relationships allowing adjusting the norms of the rate of the wearing of fishing gears. The safety factor of 4.62 was obtained experimentally and this value ensures the uninterrupted usability of a fishing gear during the exploitation period. Originality. Based on the system integrated experimental and theoretical studies of the loss of strength of thread and netting materials, for the first time we developed the mathematical relationship for the loss of strength of kapron fishing materials depending on the time of insolation that allows predicting the degree of their wearing during the exploitation of various types of fishing gears. Practical value. The obtained equations of the relationship between the loss of strength of fish netting materials and the time of exposure to sunlight are used in the calculation of wearing rates for beach seines, hoop nets, and fish net cages. The use of the recommended materials with the estimated safety factor will allow increasing the service life of fishing gears.