New, improved Cincinnati pipe co-extrusion dies offering enormous flexibility

The new pipe dies from Cincinnati Extrusion, Vienna make it possible to produce co-extruded polyolefin pipes with any desired distribution of layers and virtually all conceivable material combinations. With its fourth generation of multilayer spiral mandrel distributors, the machine manufacturer offers processors the chance to meet the ever-increasing competitive pressure with special products and maximum flexibility.

While thin, co-extruded layers of easy-flowing materials were frequently used in the past as coupling agents or barriers in pipe production, the trend today is moving to-wards layers that add value to the finished product. Such layers, for example, are flame-retardant, provide scratch-resistance or shielding against electro-magnetic waves. Plastic materials suitable for such purposes often come with high viscosity and difficult flow characteristics. Since these materials are also mostly expensive, it is necessary to ensure their economical use with minimum layer thickness toler-ances as well as optimized processing characteristics and high endproduct quality in pipe production. Cincinnati, a machine manufacturer who has been specializing in the production of customized pipe extrusion dies for many years, is continuously working towards further improvement of its pipe extrusion dies. With its fourth gen-eration of 2- and 3-layer polyolefin pipe extrusion dies the machine manufacturer has taken another decisive step forward.

As the market is also showing a trend towards ever-increasing pipe dimensions, the new pipe dies are laid out for pipes with diameters from 16 to 630 mm, made from PP and PE 100. The outstanding features of this new pipe die generation are small outer dimensions, short, simple melt distributors and the new IRIS spiral mandrel geometry. IRIS spiral mandrel distributors are already wellknown in the industry for their low pressure build-up and consequently gentle material processing, together with high throughput.

Diameters up to 630 mm are covered by the standard range of the new multilayer spiral mandrel distributors. Of course, larger diameters can also be supplied upon request. With these dies pipe extrusion has become feasible with virtually all material combinations and layer thickness distribution concepts. Thanks to their special ge-ometry, these extremely flexible dies also ensure excellent layer thickness distribution in pipe co-extrusion, regardless of the throughput rate.

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