Cincinnati Extrusion GmbH has developed a production line to make PP-R pipe, using two outer layers of random copolymer polypropylene and a middle layer of glass-filled PP homopolymer.
The pipes are an alternative to conventional heating and sanitary pipes for hot and cold water in buildings, according to the company in
In contrast to conventional pipes, the PP-R pipes' glass-fiber content reduces their lengthwise expansion, especially when hot water is being transported, and lessens their deflection.
To make the PP-R pipes, Cincinnati Extrusion recommends a combination of two Talos single-screw extruders. 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 has a length of only 25-D and a smooth processing unit sporting anti-wear protection for running PP with glass-fiber content.
The two extruders are synchronized by a microprocessor control system. The system uses an Iris 25-3 coex triple-spiral mandrel die, which can be easily adapted to different layer thickness distributions.
One special feature is the downstream equipment for pipes up to 60 millimeters in diameter. Pipes up to 32mm are normally cooled in a full bath; spray cooling is recommended for larger diameters. To cover both categories with a single downstream unit, Cincinnati Extrusion has designed a variable water-cooling bath, which switches back and forth between both cooling techniques.
The system also includes a caterpillar haul-off, cutting saw and tilting table.
In other news, Cincinnati Extrusion has sold more than 700 Alpha single-screw extruders since introducing the machine at K2001. Now the company has added to the range. The Alpha 75-25B is designed for technical profiles as well as small-diameter and corrugated pipes, with a screw diameter of 75mm, a smooth feed bushing and a processing length of 25-D. Standard equipment includes a relay control cabinet and a mobile, digital operator terminal.
Customers can choose a screw geometry for high density polyethylene, polypropylene, ABS, polystyrene and PET, and one for modified hard PVC granulate and hard PVC with filler content, and one for soft PVC granulate and thermoplastic elastomer blends.
Tel. 859-746-1530, fax 859-371-4534, e-mail [email protected].