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Machinery News

Pipe reinforced with glass fibres
Austrian extrusion machinery producer Cincinnati Extrusion has developed a three-layer pipe line that is able to extrude pipes with a glass fibre-reinforced middle layer.

The pipe consists of two outer random PP layers and a middle layer of homopolymer PP filled with 10-20% of short glass fibres. The normal distribution of layer thicknesses in the three-layer pipes varies between 25/50/25% and 33/33/33%. The glass fibre reinforcement gives these pipes added stability and e-modulus.

The line uses an extruder combination consisting of two of Cincinnati’s 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 25 L/D long and has a smooth processing unit with anti-wear protection to protect it from the fibres. The IRIS 25-3 coex triple-spiral mandrel die 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.

These types of pipes are used in the heating and sanitary sectors for hot and cold water transportation in buildings.

 

 
 
 
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