FIELD: machine building.
SUBSTANCE: coextruded tube consists of thermoplastic polyurethane (TPU), mid layer of the mix of TPU, ABS and MDI adduct takes in the following ratio, weight parts: (98.7-83.0):(1.0-15.0):(0.3-2.0), inner TPU layer. Ratio between depths of outer, mid and inner layers makes (0.1-0.5):(0.7-0.4):(0.1-0.6). Mid layer includes additionally an electrically conducting carbon black in amount of 0.1-20.0 wt %. Extruder plant comprises the main and lateral extruders with outlet channels and forming head. Detachable adjusting washer 5 is arranged in forming head 1 at inlet 2 on the side of the main extruder to overlap 10-90% of its outlet channel area.
EFFECT: higher strength.
3 cl, 3 dwg, 1 tbl, 7 ex
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