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DPM 33 Features
Research and development
Process and product optimization
Quality control
Material savings
Fully automated test procedure
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ULTRASOUND
TRANSMISSION—THE
INNOVATIVE emco METHOD TO EXAMINE THE PROPERTIES
OF PAPER AND OTHER MATERIALS AND THE DYNAMICS OF THEIR
INTERACTION WITH LIQUIDS.
Many
important paper converting operations, such as coating,
printing, laminating etc. involve the absorption of
liquids, mostly water by the paper. This absorption
process is effected by a number of factors, such as the
properties of the paper and of the liquid and the
operation conditions (temperature, pressure, machine
speed etc.). With the emco DPM 33 it is for the
first time possible to study these interactions with
millisecond resolution. Thus the emco DPM 33 is
an important tool for product development, research and
quality control.
The
emco DPM Method
uses ultrasound to measure liquid penetration into
papers and paperboard. As the liquid penetrates into the
test sample its ultrasound conductivity changes. These
changes are monitored by the emco DPM 33 and
displayed as “transmission versus time” graphs. Each
paper / liquid combination has its very characteristic
“fingerprint”. As an optional feature, the test
liquid temperature can be raised and controlled up to
195 °F.
Traditional Penetration Tests, such as the Water
Absorptiveness Test T 441 (Cobb Test) produce only one
“snapshot” result at a predetermined time, with no
information on the conditions before and after. The
innovative emco method by contrast provides a
continuous record of the paper / liquid interaction from
the moment of contact until the test is completed.
Coupled with the high resolution of the measurement (one
data point every millisecond) this allows for the first
time the examination of the penetration processes on a
time scale commensurable with the speed of the
converting processes. |
