MACHINERY | CONTROL & INSTRUMENTATION
measure RTD on a lab-scale film line using copper phthalocyanine tracer pulses. A small amount of tracer – which can be a number of substances – is introduced to the feed in a short ‘pulse’ and its concentration over time is then measured. Overall, the results showed that – as expected
– rate was the strongest factor for RTD. Blow-up ratio was found to have no effect, while the tracer type and tracer concentration had some minor effects, the researchers said. They found that UV-Vis spectroscopy was more
Above: Among the products on show at NPE will be NDC’s Mini-Trak O-Frame Scanner
conditions so that the average and maximum streaming velocity increases,” said Neubert. The researchers said that more intense cooling could be delivered with an additional air-guiding element – and the simulation results were used to test one in a virtual environment. This was then validated experimentally and showed good correlation: for instance, the normalised from height line of the simulated contour was just 2% higher than that seen in the experiment. “Further work will investigate the potentials in
increasing the mass flow rate of high capacity blown film lines,” said the researchers. “Additional air guiding elements will be tested on a virtual and experimental basis. The basic idea of pre-cooling the aspirates air is also of interest.” At the same event, researchers from Dow Chemical used UV-Visible spectroscopy and optical imaging of the film bubble to study residence time distribution (RTD) on blown film lines. RTD is an important characteristic in extrusion – but few experiments have focused on production processes like blown film production, said the researchers. UV-Vis and optical imaging were used to
accurate at lower tracer concentration but was more expensive and difficult to scale up, while optical imaging was more economical and easy to install on large scale lines – but had lower sensitiv- ity and was limited to coloured tracers.
Measured response NDC Technologies will introduce several new measurement systems at the forthcoming NPE exhibition in the USA, including its latest FilmPro infrared gauge for the film, sheet and coating industries. The gauge uses advanced optical techniques to
measure a wide range of film and sheet properties with high precision. The modular FilmPro gauge can measure the thickness of clear, voided, pigmented, cavitated, porous, translucent coloured and even black-tinted films, says the company. The measurement capability of FilmPro extends to single- or multi-layer products including thin, biaxially-orientated films, cast films and CPE stretch films. It can simultaneously measure the individual thicknesses of up to six different layers in co-ex- truded films. At NPE it will run on NDC’s Mini-Trak O-Frame Scanner and
Pro.Net TDi Web Gauging System platform. At the same time, its Low Energy X-Ray Sensor is for thickness and basis weight measurements of lightweight extruded film and sheet.
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US Pat. #9,182,067 Chrome Roll Skew Mechanism
US Pat. #9,139,393 Roll Lock-Out Safety System
US Pat. #8,342,118 Sheet coating system
MULTI-PATENTED TECHNOLOGY World Class Sheet Extrusion Systems Model GCH841830 Horizontal Five Chrome Roll Stand Processing Technologies International, LLC | 2655 White Oak Circle Aurora, IL 60502 | Tel: 630.585.5800 | Fax: 630.585.5855
US Pat. #8,021,140 Linear bearing assembly
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