MACHINERY | PIPE DIES


Features of the new rotating extrusion dies include counter- rotating tip and die, co-rotat- ing tip and die, rotating die with conventional tip, rotating tip with conventional die, crosshead or inline, multi-layer, striping, certain profiles and optional quick- change cartridges that minimise


cleaning downtime. “Using rotary dies,


Above: Conextru of Austria has supplied its largest cross head for polyolefin pipe coating


extruders can realise cost savings due to the elimination of secondary processes, cosmetic enhancement of


the end product with the elimination of weld or parting lines, plus reduction or


complete elimination of ovality,” said the company. The new rotary models are available as turnkey


packages, complete with die cart, tools and all accessories for installation and maintenance, said Guill.


Altered profile


Guill has also developed a new reciprocating head that automatically alters a tube’s profile. Here, the traditional tip and die assembly is


replaced with a linear reciprocating assembly that changes the tube’s profile within a given length. This process is repeated throughout a single extrusion run without interruptions. Cutting capability, in association with the extrusion speed, cuts the finished product to length. Both cost and value stream activities are


reduced, while quality is improved, says Guill. Only one extrusion run is needed to produce a finished product, rather than multiple extrusion runs with tooling changes along with a manual assembly operation to connect different tubing shapes. The reciprocating head eliminates an assembly


operation, as well as in-process inventory. This means there is no need for storing various tubing shapes and connectors needed for assembly, fulfilment of orders and replenishment of finished goods.


PO pipe coating Conextru of Austria says it has supplied its largest cross head for polyolefin pipe coating. Coating polyethylene (PE) pressure pipes is a significant trend, says the company. It involves covering the PE100 pipe with an additional


34 PIPE & PROFILE EXTRUSION | May 2020


polypropylene (PP) layer, via a coating process. This 1-3mm PP layer protects the pipe when it is installed in a trench without sand, which reduces the cost of installation. The PO 1000 CR pipe heads that make the pipes


are 400-1000mm in diameter, and have a maxi- mum throughput of 250 kg/h. The distribution system is a helical spiral of 36 channels, which is specially designed for low output and low volume. PP and PE do not weld together, so the grip or adhesive force is by shrinking the PP to the PE pipe. Different process parameters can influence this grip – with PE pipe temperature being the most important. The whole coating equipment has a range of 400-1000mm, and has an electrical box as an interface for all power cables and thermocouples. A C 45 30 extruder, with maximum output of 250 kg/h PE and 200 kg/h of PP, includes a barrier screw and ABB PLC control. A second extruder (C 30 25), with maximum output of 5 kg/h provides colour stripe material.


Tooling takeover US-based Paradigm Industrial, a custom engi- neering and manufacturing company, recently bought Vulcan Tool Company – whose products include the Shimmy range of die and tube cutting machines. According to Paradigm, the Shimmy die pro- vides superior speed and accuracy for trimming stamped parts. At the same time, Vulcan’s Brehm, Ultimate and Ringmaster tube cutters are known for high-speed cuts that are burr-free and are used in many industries. Vulcan also markets the Vulcanaire spindle attachment to provide high- speed options for existing mills and lathes. “Re-establishing our commitment to Vulcan Tool customers across the USA and around the world is a top priority,” said Ashley Webb, owner of Para- digm Industrial. “Vulcan has helped many manufac- turers increase productivity and profit in the past. With the support of Paradigm, Vulcan is leaner and more capable.” He said that Paradigm is already enhancing


infrastructure, investing in new equipment and expanding staff numbers.


CLICK ON THE LINKS FOR MORE INFORMATION: � www.davis-standard.com � www.maillefer.net � www.guill.com � www.conextru.eu � www.paradigmindustrial.com � www.vulcancut.com


www.pipeandprofile.com


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