| 摘要 |
FIELD: machine building.SUBSTANCE: pipeline of braking system with pneumatic drive, which includes the following layers: the first external layer of moulding composition containing at least 40 wt % of polyamide, the monomeric units of which contain on average, at least, 8 atoms of carbon; the second layer of polypropylene moulding composition, as well as the first internal layer of moulding composition on the first one, which contains at least 40 wt % of polyamide, the monomeric units of which contain, on average, at least 8 atoms of carbon; at that, a) outer diameter of pipeline is 6 to 20 mm, b) thickness of walls is 1.0 to 2.0 mm, and c) thickness of the second layer is 25 to 75% of wall thickness.EFFECT: economic manufacture, higher resistance to breakdown and high impact strength at low temperatures.5 cl |
