Patent ID: 8313322
Filing Date: 2012-11-20
Classification: B29B,B29C,B29K,B29L

Abstract:
1. Apparatus for the production of molecularly bi-oriented plastic pipes, comprising: a mould whereby an oriented pipe is produced from a blank pipe by expansion, said mould is formed by a central body, a first head and a second head connected on opposite sides of the central body; a rigid and perforated guide, which is axially centred inside the mould, said guide being extended between the heads and the central body, which has an outer diameter slightly less than the inner diameter of the blank pipe for the longitudinal coupling thereof on the guide, and which is provided with orifices adapted for the passage therethrough of an expansion fluid which causes the expansion of the blank pipe against the inner walls of the mould; a tempering chamber confined between a sleeve and the outer surface of the central body; bores, connecting said central body with the exterior through a collector adapted to apply the vacuum; orifices in said heads, which communicate the interior of the mould with the exterior and which are adapted to apply vacuum, to introduce lubricant fluid or cooling fluid; a pumping system connected to the interior of the expanded plastic pipe through the orifices of the guide and adapted to apply cooling fluid through the orifices of the guide; wherein the bores are adapted to introduce lubricant fluid or cooling fluid, and wherein the apparatus further comprises a support bushing coupled to the second head whereto is fixed one of the ends of the guide, which is provided with an opening adapted for the intake of expansion fluid and/or cooling fluid towards the interior of the guide.