Powder Cell Powder Flow Measurement with MCR Rheometers
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Powder Cell
Powder Flow Measurement
with MCR Rheometers
::: Intelligence in Rheometry
Powder is everywhere … … and it creates challenges Working with powder can be difficult, particularly when it comes to processing and storage. Most of these challenges are related to powder flow. Powders not only create difficulties in processes, the intake and predelivery control of powder is highliy important as well. To ensure efficient quality control and smooth powder processing, you can simulate and determine powder flow under various conditions using an MCR rheometer combined with a Powder Cell. A wide range of factors influence powder flow – such as particle size and shape, chemical structure, humidity, temperature, packaging behavior, static charge, surface morphology, gas adsorption, air humidity and distribution of particle sizes. As a result, powders – as mixtures of solids, liquids and gases – are complex. This complexity can be simplified with one value: Cohesion Strength. Cohesion Strength is the internal resistance of the powder to flow. Based on Cohesion Strength, you can predict whether the powder will flow through your process smoothly and whether the quality of your powder has changed. The measurement curve converges to one Cohesion Strength value. No matter which factor influences your powder, the established Cohesion Strength value will change.
Analysis with the Powder Cell
Easy Reproducible and reliable
Special powder template available
True Powder Rheology
for rheometer software
Fluidization ensures reproducibility
Automatically performed calibration
by clearing the “powder memory”
Live visualization of measurements
Operator-independent measurements
(with the software)
Over 90 years of experience
Intuitive handling
in smart engineering
Simple cleaning (cell dismantled
Usage of high-quality components
within one minute)
Optional pressure drop measurements
Support from worldwide Anton
Paar service network
High throughput
Economic Results within two minutes
Interchangeable measuring cell
Mutliple options with one device Automatic measurement program
Low operating costs Capable of measuring all kinds of
Fully automated one-click calibration powders (all Geldart groups)
dry sharp edges
moist
Torque M [mN.m]
Torque M [mN.m]
round edges
Interval Time tint [s] Interval Time tint [s]
Figure 1: Even a small amount of moisture can influence the flow behavior to a Figure 2: The shape of your particles can and will influence the flow behavior
large degree (same particle size)
ruined batch smaller grains
Torque M [mN.m]
Torque M [mN.m]
batch within specifications larger grains
Interval Time tint [s] Interval Time tint [s]
Figure 3: Variation between batches can be represented accurately Figure 4: Grain size influences the powder flow (chemically identical powders
with a slight difference in grain size)
Unique dust protection
The Powder Cell’s unique Dust Protection Hood safeguards the operator
and the instrument from fine and potentially hazardous powder even when
it is fully fluidized. By combining the air seal technology and a two-fold
geometric barrier, the Powder Cell is one hundred percent dustproof without
any friction on the measurement axis, and thus retains the MCR rheometer’s
extraordinary accuracy and resolution down to 10 nNm and below.
You are able to safely and reliably quantify the most minuscule
changes in your powder.
Specifications
Torque range: max. 300 mNm
Min. torque rotation: 10 nNm (air seal influence included)
Normal force range: 0.005 N to 50 N
Normal force resolution: 0.5 mN
Measurement systems: two-blade stirrer, Warren-Springs geometry, cylinder,
profiled cylinder, further systems on request
Sample volume: min. 100 mL
Dust Protection Hood: d ≥ 5 µm particles, 100 % dustproof; 5 µm > d ≥ 1 µm particles,
90 % to 95 % dustproof
Supplemental equipment kit for scientific purposes (R&D) available containing:
Mass Flow Controller for software-controlled air velocity
Pressure Sensor to characterize the pressure drop across the powder bed, enabling
high-end rheological characterization of fluidized beds
The Powder Cell is compatible with the following MCR rheometers:
MCR WESP, MCR xx1 series (all devices), MCR xx2 series (all devices)
Specifications may vary depending on the instrument
Simplify complexity: Many applications,
one Cohesion Strength value
Concrete
Measuring curves of powders
Sugar
Powder paint
Metal powder
Glass beads
Frequently asked questions How can I use a Powder Cell combined with an MCR rheometer? The Powder Cell ensures the quality control of incoming and outgoing powders and bulk products. Additionally, it is highly useful for process monitoring and for promptly detecting changes in your powder and thus avoiding extra costs. You can gather even more data when using the Powder Cell in the scientific version (fluidization parameters, True Powder Rheology). How reproducible are the measurements? The reproducibility depends on the powder but the deviation is usually less than 1 %. However, small changes in the powder properties, such as water content or impurities, have a much greater influence on the measurement. Can I also measure hazardous powders? The Powder Cell can be sealed, is conductive, has no ignition sources and is therefore also a good tool for hazardous powders. Nevertheless, the measurement of hazardous powders is done at your own risk; we advise you to contact our product specialists before such operations. Can I also measure wet powders? Of course it is also possible to measure wet powders; due to its smart design the Powder Cell measures a wide range of powders and bulk solids. Depending on the powder and the application, you also get a lot of valuable additional information if required, such as the drying curves for wet powder during the drying process in the cell. How long does a measurement take? A single measurement itself takes about one minute. Including the preparation of the cell, the entire operation takes about two to four minutes. You can accelerate this by using multiple cells. How can a Powder Cell combined with an MCR rheometer improve my process? This setup helps you to perform quick but thorough and reliable quality checks of the powder as it is received. The Powder Cell also helps you detect the quality of the final product and semi-finished goods swiftly and reliably to avoid further problems. If you are interested in a powder’s special flowing behavior, this can also be engineered with the help of the Powder Cell. Can I perform advanced rheological measurements? Of course. All advanced measurement modes used in liquid rheology can be applied to powders using the Powder Cell. However, to correlate rheology with precision pressure drop measurements you would need the supplemental equipment kit for scientific purposes.
© 2015 Anton Paar GmbH | All rights reserved.
Specifications subject to change without notice.
D43IP001EN-A
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