| 摘要 |
<p>Method for producing a hollow body by the extrusion and blowing of a plastics material, comprising feeding plastics material to an extruder and an extruding die 3 at the outlet of which there is obtained a parison 28 roughly producing the shape of the hollow body, and blowing air into the parison, thereafter introducing this parison into a mould 6 having a cavity 7 whose shape corresponds to the shape of the body to be moulded, wherein, with the mould open 6, air is blown into the parison 28 until its length is equal to the length of the desired hollow body, then the blowing air is cut off so as to obtain a deflated parison 31, the mould 6 is closed and air at high pressure is blown into the parison 31 so as to obtain the moulded body 9a. This method results in a uniform thickness of the plastics material in the various cross-sections of the container. <IMAGE></p> |
