Products: Line processes 3-layer GRF-PP pipes

 
The normal distribution of layer thicknesses in the 3-layer pipes varies between 25/50/25% and 33/33/33%. The glass-fiber reinforcement gives these pipes added stability and e-modulus.

For extruding these pipes, the machine manufacturer recommends an extruder combination consisting of two of its Talos single-screw extruders. While the extruder for the inner and outer layers is equipped with a 30 D processing unit and a grooved feed section, the extruder for the middle layer is just 25 L/D long and has a smooth processing unit with anti-wear protection to protect it from the fibers. The die, one of the company’s IRIS 25-3 coex triple-spiral mandrel dies, is suitable for pipe sized from 16-250 mm and can be adapted to different layer thickness distributions.
 
While pipes up to 32 mm are normally cooled in a full bath, spray cooling is recommended for larger pipe diameters. The company combined both in a variable water cooling bath which, depending on the application, can be switched from spray bath cooling to full bath cooling. —[email protected]