Development of a method for determining the consumption of a polymer composition on the surface of abrow tissue to reduce the expansion of threads

The article deals with the results of theoretical research of the use of polymer composition based on collagen to reinforce the structure of textile materials in order to prevent sliding in the seams. The calculation of the weight of polymer composition applied to the surface of textile material of garments has been presented. The dependence of the weight of polymer composition on the radius of warp and weft yarns and the width of a unit fabric structure has been determined. A formula for the volume of polymeric material has been obtained to calculate the necessary mass of the polymeric composition applied to the surface of the connection seams.

Microplastics in the Center of Mediterranean: Comparison of the Two Calabrian Coasts and Distribution from Coastal Areas to the Open Sea

Plastic is everywhere—increasing evidence suggests that plastic pollution is ubiquitous and persistent in ecosystems worldwide. Microplastic pollution in marine environments is particularly insidious, as small fragmentation can increase interaction with biota and food chain access. Of particular concern is the Mediterranean Sea, which has become a large area of accumulation of plastic debris, including microplastics, whose polymeric composition is still largely unknown. In this study, we analyzed the polymeric composition, particle size distribution, shape, and color of small plastic particles (ranging from 50 to 5000 µm) collected from the sea surface in six stations at the center of the Mediterranean Sea. We also described, for the first time, the different distribution of microplastics from coastal areas up to 12 nautical miles offshore. The microplastic density was 0.13 ± 0.19 particles/m2, with a marked prevalence of smaller particles (73% < 3 mm) and a peak between 1 and 2 mm (34.74%). Microplastics composition analysis showed that the most abundant material was polyethylene (69%), followed by polypropylene (24%). Moreover, we reported a comparison of the two Calabrian coasts providing the first characterization of a great difference in microplastic concentration between the Tyrrhenian and Ionian sides (87% vs. 13%, respectively), probably due to the complex marine and atmospheric circulation, which make the Tyrrhenian side an area of accumulation of materials originating even from faraway places. We demonstrate, for the first time, a great difference in microplastic concentration between Tyrrhenian and Ionian Calabrian coasts, providing a full characterization and highlighting that microplastic pollution is affected by both local release and hydrography of the areas.

Development of a Bitumen-Polymer Composition, Resistant to Atmospheric Influences, Based on Petroleum Bitumen and their Properties Study

In the work the bituminous-polymeric composition stable against action of external factors is designed taking into account literature-patent researches and industrial needs. The basic physical-mechanical and thermophysical properties of the designed bituminous-polymeric composition are investigated, and also change of water absorption, shrinkage with time and flammability is studying. The technology of manufacturing bitumen-polymer composition in production is described. The designed bituminous-polymeric composition on some indicators, in particular on heat resistance and flexibility is better than existing analogs that allows its introduction.

Teoretiko-Experimental Method of Definition of Parameters of the Roller with the Rubber Plug of the Device for Drawing of the Polymeric Composition on Lines of Sewed Materials

In article the device for drawing of a polymeric composition on lines of ground off materials is resulted. Dynamics of the machine unit is considered, laws of movement of rollers of the device are defined, to a basis of the analysis of graphic dependences recommended parameters of system are proved. On a basis full factorial experiments parameters of the device for various sewed materials are recommended.