mono series, a model is already being tested, says the company. The company has also developed a new

generation of Spider pipe dies for twin-strand lines. The three-layer model, the Spider NG 250-3, is

covered in our multi-layer pipe feature elsewhere in the issue. Battenfeld-Cincinnati has also produced a pipe

extrusion die which it says has the largest adjust- able melt gap – allowing pipes of 1,200-1,600mm in diameter to be made without nozzle change. With additional extension kits, it is possible to

Above: BASF’s new Ultradur grade can be used for extruded products such as pipes and profiles

BASF has developed several extrudable grades of its Ultradur PBT. Until now, the melt strength of PBT was not high enough to allow it to be extruded. By connecting and branching the polymer chains – using tailor- made additives – BASF has raised the high melt strength of the grade, called Ultradur B6551 LNI. The company says it can be used to make pipes, profiles and mandrels. The material has high melting point, good crystallinity and dimensional stability – as well as a good vapour barrier, said Tatiana Ulanova, of BASF’s extrusion, medical and industrial manufac- turing division. “The main advantages of PBT are its higher mechanical properties and temperature resistance,” she said.

BASF modified one of its existing additives, to

join short polymer chains together in order to boost the melt strength, she said. �

Right: Battenfeld- Cincinnati says its new extrusion die can make pipes of 1,200- 1,600mm in diameter

without nozzle change

Battenfeld-Cincinnati exhibited a number of pipe die technologies at K2019, including two Spider pipe heads for PVC processing (for mono- and multi-layer pipe). It also showed a fast-dimension- change (FDC) pipe head – which allows dimension- al changes during production. The new generation of Spider heads offer the advantages of low material consumption and narrow tolerances resulting from optimised layout, says the company. The Spider NG 160 mono-layer head is suitable for pipes with dimensions ranging from 32 to 168mm and output rates from 250 to 800 kg/h. At K2019, the mono-layer Spider was flanged onto a conical ConEx NG-65 twin screw extruder. The mono-layer pipe heads have also been completely revised. All pipe heads in the Spider NG series will now be available in six sizes for pipe diameters ranging from 6 to 630mm. Using flow simulation in the redesign of the mono dies has helped to improve their performance. From this

38 PIPE & PROFILE EXTRUSION | November/December 2019

produce pipes ranging from 400 to 1600mm in diameter. The pipe head, which was exhibited at K2019, has since been delivered to a Mexican customer. Previously, Battenfeld-Cincinnati supplied pipe dies with adjustable melt gaps in sizes ranging from 20 to 1200 mm for many applications. “An adjustable melt gap always makes sense, especially if the pipe manufacturer wants to produce different pipe dimensions on its line and to respond fast and flexibly to market trends, or to make frequent dimensional changes,” said the company. For the extrusion of pipes in small dimensions, the adjustable melt gap is not used for dimensional change, but offers more flexibility to cope with the typical swelling behavior of every material when- ever a material change is made. This helps to achieve narrow tolerances and high pipe quality. Another advantage of the adjustable melt gap is safe handling. Especially with large pipes, such as those within the 1,200 to 1,600mm diameter range (such as those produced by the Mexican customer), a nozzle change – which is necessary in conven- tional dies – always involves a special effort and involves a safety risk. The automatic adjustment helps overcome these drawbacks. �

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