| Features
- Quantitative Absorption and Desorption Data vs. Time for a Multitude of Materials
- Generates instant graphs and .xls data
- ISO-9073-12 OR ASTM Standard D-5802 Compliant
- Replaceable Test Plates adapt to almost any material interface
- Up to 400 grams total absorption with standard balance
- Maintains constant liquid head to material under test
- Automatic test start and termination
- Easy WindowsTM interface
- Virtually no limit on data file size
- No downloading of files to PC
Applications
- Tissue, Toweling, Super-absorbers, Non-wovens, Diapers, Sanitary products, etc.
Options
- Up to 950 grams total absorption with optional balance
- Sample Thickness vs. Time
- Wetted Area vs. Time
- Taller slides for desorption testing with more negative hydrostatic head
- Your customized application needs
Description
The Absorbency Test System maintains a constant level of liquid to the specimen under test at all times. The liquid is supplied from a reservoir through a siphon to the test specimen. The weight of the reservoir with fluid is measured by a precision electronic balance and monitored by a program running in the WindowsTM environment. The program uses the weight information to calculate the level of liquid within the reservoir and in turn controls the height of the test specimen to match level of the liquid. The height adjustment is maintained with a motorized precision lead screw assembly. The weight of the liquid being absorbed is recorded in real time to hard disc. A graph of the absorption rate is plotted as the test proceeds on the user interface window.
Setup
For the initial setup, the user partly fills the siphon reservoir and fills the upper refill reservoir. The siphon to the sample interface is then primed with liquid. The Fill Cell command then automatically tops off the siphon reservoir to a predetermined weight (and height). Subsequent tests simply require the Refill Cell command after the previous sample is complete.
Operation
The meniscus of liquid at the sample interface may be finely adjusted with the lead screw to accommodate the type of desired test initiation. The absorption process may be started either manually or automatically. Manual initiation is done by momentarily raising the meniscus of liquid to touch the sample or by placing the sample on the raised meniscus. The automatic start mode may begin with the sample already in place over the meniscus. The Auto-Start command will momentarily raise the meniscus for the initiation of absorption. As soon as fluid is drawn from the siphon reservoir, the weight data of the absorbing liquid is stored. The data storage continues until either the test is manually terminated or the absorption rate declines to 1% of the total absorbed mas over the last 5 seconds (ISO09073-12) or 5mg / 20 seconds or a user defined value. If the user has specified an elevation variable (height to raise the specimen above the meniscus), the desorption process will automatically engage by first stopping the flow from the siphon, raising the sample to the programmed height, and restarting the flow from the siphon. Data is collected until the pre-defined desorption rate is reached. A graph is constructed on the user interface window for a quick look evaluation of the test. This graph may be printed or reconstructed later by re-importing the data file. The data is stored in tab delimited columns, (sample number, time in seconds, and absorbed weight) for direct importation, graphing and analysis in Excel TM.
Thickness Measurement Option
The thickness measurement is available in an array of ranges depending on the range of specimen thickness and the desired resolution. Please call for you specific application. The thickness of the specimen is reported along with the weight of the absorbed liquid continuously ten times per second for the duration of the test. The thickness option adds a fourth column to the data file.
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Wetted Area Option
A video camera is positioned above the sample in view of the area of the sample to be wetted. As absorption occurs, the sample becomes slightly darkened from the liquid. Images are captured and analyzed in real time, the wetted (darkened) area is calculated, and the area is added as a fourth or fifth column to the data file. In the event that there is insufficient contrast between the wetted and dry areas, the contrast may be enhanced with the use of dyes. The applicability of this option depends upon the type of sample in the way the wetting may be viewed from the top.
Other Options
Your application needs.
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