| 摘要 |
This invention relates to a process for making a cylindrical element by rotation moulding, or by a technique enabling deposit of successive layers, and a element obtained by the said process. The process according to this invention comprises a cycle of successive deposits of layers of thermoplastic materials by rotation moulding, or by a technique enabling a deposit of successive layers, the said cycle comprising at least one deposit by rotation moulding or by a technique enabling deposit of successive layers at a temperature from 170 to 240° C., composed of an ethylene-vinyl alcohol copolymer with a density at this temperature of between 0.94 and 1.4, and a melt flow index of between 1.3 and 4.2 g/10 minutes.
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