machinery feature | Pipe dies


deflector and tip. No fastening hardware required It allows fast tool changes,


thanks to a threaded retaining ring


for the die and threaded tip retainer. Dies are removed from the front, and tips from the rear


Making an air/vacuum


connection is simple – as is cleaning. Overall, the ease of use helps to reduces


downtime and lower costs, says Guill.


Rollepaal’s multilayer die heads are designed on the principle of symmetrical branching of the melt feed


Solid and multiwall Rollepaal designs die heads for both solid- and multi-wall pipe.


Its solid wall pipe extrusion die heads have been designed using 3D visco-elastic models, which calculate optimum flow lines for compression cones that would otherwise not be feasible, said the company. The spider dies are designed to be robust, though


Guill’s Series 725 co-extru- sion crosshead is aimed at tray cable


applications


easy to assemble and dismantle. Flow lines have been optimised for reliable, reproducible produc- tion, allowing high outputs and easy-to-run formulations, says the company. As the compression is high, the pipes are smooth without weak spider lines. Features include: modular set-up; quick tool change; and, thermal centring – which allows faster wall thickness adjustment. They can


be used to make PVC pipes from 20-1,000mm, and poly- olefin pipe from 20-2,000mm. Meanwhile, its multilayer die heads are designed on the principle of symmetrical branching of the melt feed for the layers. Symmetry in-melt feed guarantees the best layer distribution, as all the flow lines have equal length, it says. This makes the die independent of melt viscosity, as there is no need for a restrictor gap with different length in circumferential direction for correction. The LXGM-G Series PE pipe extrusion die-head from


Ningbo Fangli has an optimised spiral structure, to ensure adaptability and stability of different raw material extrusion, says the company. The whole series is modular and universally designed, and can be used in the production of pipes from 250 to 2000mm. Each model has single-layer, double-layer and triple-layer structure, and the die-heads are equipped with an inner cooling system. Features include: suitability for use with a wide


range of materials, including all types of PE; spiral structure across the series; precise temperature control, and low melt temperature; low internal pipe stress; and, the same universal design of bush and mandrel is used on different base dies.


Click on the links for more information:


❙ www.conextru.eu ❙ www.guill.com


❙ www.rollepaal.com ❙ www.fangli.com ❙ www.tum.de


Does your pipe head have these features?


● Internal pipe cooling (IPC) ● Low heating power consumption ● Low back pressure ● Quick horizontal die change ● Low volume – short residence time ● Low pipe overweight ● Quick dismantling


Ask us for state of the art extrusion tools for mono- or multilayer pipe production, and cross heads for coating.


CONEXTRU GmbH


ENGINEERING & CONSULTING FOR EXTRUSION


CONEXTRU GmbH | Klosterstraße 19, A-3011 Tullnerbach | info@conextru.eu | www.conextru.eu


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