MULTI-LAYER PIPE | MACHINERY
Multiple benefits
Die technology, machinery developments and new materials are all contributing to advances in multi-layer pipes
The increasing demands on pipe – for properties such as heat resistance, superior barrier or higher strength – have led to an increase in multi-layer pipe technologies. At K2019, Tecnomatic of Italy showcased
several die technologies for making multi-layer pipe – including its Venus Multi series. Die heads in its Venus series use multi helical spirals to produce two-, three- or four-layer polyolefin pipes – even in large sizes. The Venus Multi range has innovative flow channel geometry, which has been calculated in consideration of the raw material being used. The geometry ensures the same behaviour for pressure and distribution of the melt, in all the pipe heads of the range – and at high output, says Tecnomatic. The new feeding system of the spiral channels helps to reduce working pressure. This helps reduce energy consumption during extrusion – as
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around 5-10% of extruder power is necessary for pumping. Lower pressure also reduces the increase in melt temperature. In combination with lower residence times, this helps to improve pipe characteristics such as oxidation resistance. The company has also developed a system that applies an external layer (made of PE, PE 100 RC, PP, PP foamed or any other special material) to the pipe. The system, called Venus Coex-unit, is a radial distribution ring, a flat spiral, where the material flows from external to the centre of the tooling through feeding channels and is then circumferen- tially distributed. The flat radial distributors are characterised by a uniform volume flow and good layer thickness distribution – as well the absence of weld lines and other weak points. The Coex-unit can be added to any existing
Venus pipehead, but it is particularly useful in multi- layer applications – such as with the new Multi
November/December 2019 | PIPE & PROFILE EXTRUSION 19
Main image: Tecnomatic recently delivered a five-layer line to a European producer of plumbing pipe
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