FIELD: technological processes.
SUBSTANCE: invention is related to new, oriented morphologies and to special type of orientation in polymer alloy, and is used for film used for lamination with cross laying of layers, and for film used for manufacture of cord materials, materials from twisted or woven tape. Mixture of two partially incompatible polymers are extruded with provision of film provided that alloy in mixture contains fibrils that are mostly stretched in the same direction. At that width and thickness of every fibril is characterised by average value less than 5 mcm, at that fibrils are molded from polymer component that differs by higher melting temperature, and fibrils are surrounded by matrix of the second polymer, elasticity module of which is less. Special morphology is obtained by installation of grids in chamber with grids upstream outlet opening of extrusion nozzle, and afterwards hot stretching is realised at the temperature, when polymer with higher melt temperature is in at least partially crystalline condition, and by cold stretching, when both polymers are mostly in hard condition. The second stage of cold stretching is realised in conditions that result in relative extension at rupture at 20°C, which amounts to at least 25%.
EFFECT: possibility to produce film for laminates with cross laying of layers that are characterised by high resistance to impact loads.
97 cl, 24 dwg, 1 tbl, 1 ex
