| 摘要 |
<p>The invention relates to a method for the injection of polyethenol parts, in which a polyethenol pellets (4) are released into a hopper or similar device (5) which delivers same to a single-screw extruder (1) provided with means (8) for the forced discharge of gases. The polyethenol is heated to a temperature of between 170 and 250 °C and subsequently conveyed to an injector (2) provided with a heating element (12) and a set of essentially conical, flared-section pipes (6) having a diameter over-dimensioned by between 20% and 40%. The injector (2) introduces the molten polyethenol pellets into an injection or blow mould (3), also heated (13), in which slow cooling is initiated. Finally, demoulding is carried out at a temperature of between 25 and 35 °C.</p> |
