Product category:
Liquid Analysis: Viscosity, Density
News Release from: Zwick Roell | Subject: Backward extrusion apparatus
Edited by the Processingtalk Editorial
Team on 04 June 2007
Controlled measurement of dynamic
viscosity
Zwick Roell is introducing an enhanced backward extrusion apparatus with optimised testing software for measuring the dynamic viscosity of substances, such as fruit preparations and yoghourt
Zwick Roell is introducing an enhanced backward extrusion apparatus with optimised testing software for measuring the dynamic viscosity of substances This test apparatus is an economical alternative to using rotational viscosimeters
This article was originally published on Processingtalk on 7 Aug 2006 at 8.00am (UK)
Related stories
Getting a grip on foodstuff viscosity measurement
Zwick Roell introduces an enhanced backward extrusion apparatus with optimised testing software for measuring dynamic viscosity, for example with chunky fruit preparations or yogurt with fruit pieces
Latest Zwick testing device tests rivets
The effect of different production parameters on blind rivet strength can now be easily tested with the new device from Zwick, which determines the mechanical properties in accordance with EN ISO14589
The process does especially well in tests directly in the container.
Being able to test chunky fruit preparations or yogurt with fruit pieces is also a significant advantage.
A multitude of measurement, evaluation and display possibilities are available thanks to the testXpert testing software.
Further reading
15th Trade Fair for testing technologies
Measuring and testing technologies will be exhibited at a Trade Fair to be held from 16-19 October in Ulm, Germany, organised by Zwick and 25 partner companies in the industry
Brand new line of plastics testers for HDT and VST
A new product line now enables Zwick to offer a total testing solution for Vicat softening temperature and the heat deflection temperature, standardised test measurements for plastic characterisation
The principle of the backward extrusion fixture apparatus is based on the displacement of the test material through an annular gap between piston and test cell.
The cell is filled with the test substance and the piston is lowered into the container, pressing the material up through the annular gap.
When the piston is raised, the material flows back through the annular gap into the cell.
The Zwick Roell system can repeat this cycle as often as desired with freely adjustable shear rates.
The test can be optimally adapted to the test material, and the viscosity can be measured across the entire shear range with a single test.
The dimensions of the piston are selected depending on the test substance.
The method allows testing directly in the container during production, for example, in a bucket or cup.
The material is not pre-stressed by decanting prior to the test.
If continuous pre-stressing of the material is desired, the software can be programmed to automatically apply pre-stress under constant conditions.
In addition, the flow effects which take place in production systems can be reproduced by varying the annular gap and piston speed.
The integration of the intelligent and reliable software testXpert II allows convenient data acquisition and evaluation and provides professional graphical displays and documentation.
It should be mentioned in particular that each cycle can be run with a different shear rate; it is very easy to modify the testing parameters, and the test equipment settings can be stored for each type of test configuration.
This allows a simple exchange of the test setup in the texture testing machine without having to re-measure the test cell.
The training and operating costs are reduced because the user can quickly and intuitively understand the testing software on account of the meaningful symbols and concise structure.
The software remains clear despite the versatile functions and possibilities. Request a free brochure from Zwick Roell ...
• Zwick Roell: contact details and other news
• Email this article to a colleague
• Register for the free Processingtalk email newsletter
• Processingtalk Home Page
Search the Pro-Talk network of sites
