FIELD: process engineering.
SUBSTANCE: stretching film is processed by forcing the thin polymer web containing tack-increasing substance through heater. Said heater is heated to temperature sufficient for causing film blooming to increase the tack before reaching the next stage of the process. Besides, pattern may be applied on said thin polymer film. Oriented thin polymer web is passed through at least one heated roller with engraved pattern having face areas and recessed areas that make said pattern. Said web contacts with roller surface areas located over recessed areas to receive smaller amount of heat than web sections located over face areas. This allows different shrinkage caused by said heat to transpose the image onto thin polymer film.
EFFECT: accelerated blooming.
9 cl, 8 dwg
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