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IN-LINE MEASUREMENT | PROCESS CONTROL


correlated and accurate MFR result, says Haake. Goettfert also offers the option to run two different dies in parallel, which allows an even greater measuring range to cover a wider range of MFRs.


Fast feedback Haake says it is common for com- pounders to run a variety of products and, especially with larger extruders, quick feedback is needed to minimise off-spec material production. In-line rheometry is particularly useful in optimising product changeovers and this is shown in Figure 1, where the technology is used to determine when the product is in-spec. Goettfert offers three types of in-line rheometer: bypass, sidestream with return, and its Realtime Rheometer with independent control of the flow. It can also provide additional means for quasi-continuous measurements of rheological data, including shear viscosity, melt index, intrinsic viscosity, or elongation. Haake says


the most recent development is a Class 1 Div 2 explosion proof version of its in-line system. Leistritz has offered its elonga- tional rheometer, which can be used as a standalone measure- ment device or as part of an in-line process control system, for around three years. Developed in conjunction with the Johannes Kepler University in Austria, the compounding extrusion machinery maker says the system differs from other in-line rheometers in using a slit die system rather than the traditional capillary. It says this means that the device can be used with materials ranging from high viscosity pipe grades to low viscosity fibre or injection moulding grades. It


can also handle glass reinforced grades, which the company says is not possible with capillary types. In an in-line configuration, a small amount of melt is diverted from the compounding extruder into the rheometer via a bypass channel. The die itself features a patented hyperbolic narrowing that


Left: Leistritz developed its elongational rheometer in conjunction with the Johannes Kepler


University in Austria


www.ky-europe.com


mslee@kyc.co.kr


IMAGE: LEISTRITZ


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