METHOD OF MAKING POLYMER TAPE FROM SECONDARY POLYETHYLENE TEREPHTALATE Russian patent published in 2013 - IPC B29D7/00 

FIELD: process engineering.

SUBSTANCE: invention relates to production of polymer tape from secondary polyethylene terephtalate suitable for use as edge tape in making seamless 3D geoweb, etc. In compliance with this invention, amorphous crystalline wastes of polyethylene terephtalate are mixed with 0.1-1.0 wt % of 1,3-phenylene-bis(2-oxazoline). Produced mix is extruded at residual pressure, preferably, 8.0-8.5 kPa and extrusion temperature distributed among the zones: I-III zones - 250-260°C, IV-X zones - 255-265°C, XI main zone - 200-210°C. Produced strand is cooled, pelletised and dried at 150±2°C to residual humidity of not over 0.02% and pellets are extruded at: I zones - 245-255°C, II, III zones 265-275°C, IV zone - 255-265°C, V main zone - 240-250°C with subsequent tape forming by calendaring at three-roll calendar cooled by running water circulated inside the rolls.

EFFECT: better mechanical properties.

3 cl, 1 tbl, 1 ex