In line melt temperature measurement during real time ultrasound monitoring of single screw extrusion

Brown, Edward A.; Olley, Peter M.; Coates, P. D.

doi:10.1179/146580100101540644

Cited by 34 publications

(17 citation statements)

References 1 publication

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“…The temperature measured by ultrasonic transducers was in good agreement with that obtained by a thermocouple and ultrasonic transducers can be used to measure the temperature of polymer melt in real time in extrusion and injection [13]. Ultrasonic transducers can be used in online processing, but the ultrasonic signal is propagated across the entire cross-section of melt, resulting in a bulk measurement [3]. In addition, the calibration procedure of such transducers is complicated.…”

Section: Ultrasonic Transducerssupporting

confidence: 58%

“…Increasing the temperature at a constant pressure would result in lower melt viscosity and hence the decreased resistance to the flow. However, overheating above the limit would result in changes in material properties and, for some materials, would result in degradation of melt, with associated safety issues [3]. Therefore, the temperature and temperature distribution of melt has direct influence on final product quality and properties, e.g.…”

Section: Introductionmentioning

confidence: 99%

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Temperature distribution measurement and control of extrusion process by tomography

Yang

Zhong

2008

2008 IEEE International Workshop on Imaging Systems and Techniques

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Polymer extrusion molding is an important process in the polymer manufacturing industry. It is crucial to measure and control the temperature of polymer melt. Although different techniques, such as thermocouple, infrared and ultrasonic, have been attempted to measure the temperature, there is no suitable means so far to measure the internal temperature in a cross section of a polymer extrusion process, and hence the process is operated by trail-and-error. Electrical capacitance tomography (ECT) is a non-intrusive and non-invasive technique to obtain permittivity distribution of a cross section. Because the permittivity is a function of temperature for a certain material, if the extrusion chamber is fully occupied by polymer, the temperature distribution can be derived from the permittivity distribution, which can be obtained by ECT. This paper reviews the existing methods to measure the temperature of polymer melt first. The approach and the key issues to measure the temperature distribution based on ECT will be discussed in detail.

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Section: Ultrasonic Transducerssupporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Temperature distribution measurement and control of extrusion process by tomography

Yang

Zhong

2008

2008 IEEE International Workshop on Imaging Systems and Techniques

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“…[2][3][4][5][6][7][8][9] Up to the present, despite various devices, including probe type thermocouples 10,11 and infrared sensors, 12,13 having been proposed to measure the temperature distributions in an injection molding process, these devices have not been able to provide a three-dimensional in-cavity temperature measurement. Temperature is an important parameter that influences process features such as cycle times, crystallization rates, degree of crystallinity, melt flow properties and molded product qualities.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical analysis of the temperature distribution of injection molded products using protruding microprobes

Liu

2011

Review of Scientific Instruments

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Injection molding has been one of the most important polymer processing methods for manufacturing plastic parts. In the process, the temperature is an important parameter that influences process features such as cycle times, crystallization rates, degree of crystallinity, melt flow properties, and molded product qualities. This study aims to, experimentally and numerically, examine the three-dimensional temperature distribution along the melt flow path of injection molded parts. A special experimental set-up, which includes an injection mold equipped with protruding microprobes for guiding embedded thermocouples, was designed and built to measure the temperature field along the flow path, i.e., inside the runner and the cavity, of injection molded products. The experimental results suggested that the disturbance induced by the probes remained negligible and precise temperature profiles could be measured at various positions inside the cavity. A significant increase of melt temperature was found to result from the viscous dissipation of the polymeric materials in the runner. Additionally, a commercially available code was employed to simulate and predict the temperature variation in injection molded parts. It was shown that the numerical simulation predicted better the temperature distributions inside the cavity than those along the runner.

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“…Industrial applications include in-service monitoring of hot plant, for example in nuclear power stations and high temperature manufacturing processes. Recent research applications include ultrasonic investigations of metal and ceramic sintering (1) and polymer extrusion (2) . The sensitivity of many piezoelectric materials to high temperatures means that standard transducers cannot be used, and various other techniques have been tried (3) .…”

Section: Introductionmentioning

confidence: 99%

Condition monitoring with ultrasonic arrays at elevated temperatures

Kirk¹,

Lee²,

Cochran³

et al. 2003

insight

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The ability to generate and detect ultrasound in test objects at elevated temperatures has potential applications in monitoring of industrial plant and processes. However, the design of an ultrasonic transducer capable of long-term operation at high temperatures is not straightforward and adaptions of conventional NDT designs have been complicated and expensive. In addition, a single- or dual-element transducer fixed in position can typically provide only single A-scans, limiting its usefulness for condition monitoring. In contrast, ultrasonic arrays can provide B-scan data which are more useful in themselves and can also be processed to form images of the interior of the test object. In this paper we describe the design of ultrasonic transducers for condition monitoring at elevated temperatures. Results are presented from a composite material made with lithium niobate and high temperature cement, followed by an outline of the areas to be considered in further work

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In line melt temperature measurement during real time ultrasound monitoring of single screw extrusion

Cited by 34 publications

References 1 publication

Temperature distribution measurement and control of extrusion process by tomography

Temperature distribution measurement and control of extrusion process by tomography

Experimental and numerical analysis of the temperature distribution of injection molded products using protruding microprobes

Condition monitoring with ultrasonic arrays at elevated temperatures

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