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battenfeld-cincinnati and Bänninger in collaboration to develop seven-layer PP-R pipe extrusion line

According to its press release on August 12, global extrusion technology supplier battenfeld-cincinnati is co-developing a seven-layer PP-R

pipe extrusion line with Bänninger Kunststoff-Produkte GmbH, a PP-R pipe manufacturer based in Germany.

“Bänninger is just now developing together with us a highly innovative PP-R pipe on a 7-layer pipe extrusion line which we have supplied and recently installed at the Stassfurt production facility. This is an exciting project with a number of highly innovative aspects, involving an enormous increase in expert knowledge for Bänninger as well as for ourselves,” Heinrich Dohmann, Head of Mechanical Engineering Pipe Heads at battenfeld-cincinnati, commented.

With a long-standing cooperation, battenfeld-cincinnati is the sole supplier of extrusion equipment for Bänninger.

PP-R pipes, manufactured from a special polypropylene random copolymer, are mainly used for transporting hot and cold drinking water and for heating systems. Additional applications are found in apparatus and plant engineering, in greenhouses and rainwater harvesting.

According to battenfeld-cincinnati, PP-R pipes are durable, resistant to corrosion and easy laying. Thanks to their high molecular weight and thermal stability, they are also sturdy and resistant to heat, chemicals and pressure. Those made of a special compound can even be produced with thinner walls than conventional pipes. Furthermore, the mechanical strength of PP-R pipes can be improved by incorporating a glass fiber reinforced middle layer in multi-layer pipes. The crucial advantage in laying glass fiber reinforced PP-R pipes is that they have a low expansion coefficient. Because of their high stability, the distance between clamps can be increased compared to conventional plastic pipes, which saves both fastening clamps and labor.

For the actual pipe production, Bänninger operates four extrusion lines of different sizes, with capacities ranging from 1,000 tons to 6,000 tons per annum, on which pipes with diameters from 16mm to 400mm are produced. Single-screw extruders of various sizes are used, which are durable even when processing glass fiber reinforced materials thanks to high wear resistance of the barrels with grooved feed zones and the barrier screws with special, customized screw geometries.

battenfeld-cincinnati said another vital component of extrusion line is the special helix WPO pipe die with a multi-layer spiral mandrel distributor. All surfaces that come into contact with the product are provided with a special coating to minimize wear and prevent damage to the flow areas.

Like all dies from battenfeld-cincinnati, the helix WPO spiral mandrel distributor ensures high throughput, exact wall thickness distribution and a long service life thanks to low dwell times of the melt in the die. Dimensioning of the flow channels has already been designed for a number of years with the help of a flow simulation software available in-house. This enables optimal melt flow conditions with minimal loss of pressure, said the company.


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