Product category:
Liquid Analysis: Viscosity, Density
News Release from: Celsum Technologies | Subject: Precision extrusion dies
Edited by the Processingtalk Editorial
Team on 12 July 2004
Precision extrusion dies for quality
assessment
Celsum Technologies supply a wide range of precision extrusion dies for laboratory rheometers and extrusion lines and pilot extrusion plants, to study the flow behaviour of muds and slurries
Celsum Technologies can supply a wide range of precision extrusion dies for laboratory rheometers and extrusion lines, as well as for pilot extrusion plants Recently, Celsum have provided a set of complex dies with bi-hyperbolic profiles (ie hyperbolic profiles on the entry and exit section of the die), and with a sub-miniature pressure transducers only 3mm in diameter embedded in the die wall
This article was originally published on Processingtalk on 11 Jun 2003 at 8.00am (UK)
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Celsum Technologies offers a range of state-of-the-art, licence-free radio telemetry instruments to allow remote strain-gauge based sensors to be monitored without the need for expensive cabling
Single-channel PID thermo-regulator
Celsum Technologies offers the EC4-173 single-channel PID thermo-regulator, in a 48 x 48 mm package, accepting both Type K and Type J thermocouple inputs
These are being used to study the flow behaviour of muds and slurries in an especially-built rheological test rig.
Celsum have also supplied regular hyperbolic-profile dies for a range of commercially available capillary extrusion rheometers, where they are useful for analysing the elongational or extensional flow properties of materials.
Such materials include polymer melts, rubbers, ceramic pastes, pharmaceuticals, foods, cosmetics, explosives, and others, although the latest batch of dies are being used to optimise processing geometry for polymers filled with wood-flour in a major recycling project aimed at developing the next generation of building materials.
Further reading
Twin-channel data-logger and printer module
The PR100A is a panel-mounting, programmable twin-channel data-logger and printer module: together with the DR100A four-channel expansion module, a total of 6 channels of data can be monitored
Programmable digital timer
The FK700T is a panel-mounted, low-voltage, dual-output, programmable digital timer in a compact 75 x 33.5 mm panel-mounting format, from Celsum Technologies
Celsum also supply regular parallel-profile precision dies for laboratory rheometers including their own BFR 2100 and Eta 2100 instruments, in a range of materials including tungsten carbide, tool steel and stainless steel.
Typically, a set of dies with the same diameter bore but different bore lengths is used to determine the "Bagley End Correction", by plotting the pressures required to maintain extrusion at a series of constant extrusion rates.
When extrapolated to zero length, there is still a finite residual pressure, and this is used to correct the shear stress values (the Bagley Correction).
This zero-length pressure is used also in most analyses, such as Cogswell's and Rides', to estimate the extensional viscosity of the fluid' that is, the viscosity when considered in tension rather than in shear.
Materials with similar shear viscosities can have widely different extensional viscosities, which can cause severe processing difficulties.
Celsum are always happy to look at special or modified dies and instruments to suit customers; specific requirements.
Celsum Technologies are also suppliers of process control and monitoring instruments, sapphire window optical probes, the new T2SR Time and Temperature Scanning Rheometer, CEST Combined Extrudate Swell and Temperature system, and a range of subminiature strain-gauge based load cells. Request a free brochure from Celsum Technologies ...
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