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product information
PAROtester2
Features
Self calibrating probe
Auto-standardization
Digital readout
Download to PC
Very accurate
Highly repeatable
Not operator sensitive
Low impact energy
Defined direction of impact
No routine maintenance
Calibration check standard
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Roll
Hardness is an important runnability parameter both in
the production and converting processes of paper, film
and foil. For good runnability the Roll Hardness must be
kept between critical minimum and maximum values right
across the roll. The PAROtester2 offers a fast and
objective way to examine the Hardness Profile of rolls
before they cause runnability problems.
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Measuring
Principle.
With the hand-held probe an impact body is launched by
spring force against the roll surface. The impact and
rebound velocities of the impact body are measured by a
non-contacting method. The ratio of these two velocities
is indicative of the roll hardness. Available as a
digital value, roll hardness is displayed in graphical
and numerical form on the electronic unit. |
| Testing
Procedure |
Historical
Note.
The PAROtester2 has been developed by the PROCEQ Company
specifically for the web processing industries as an
improvement over the Schmidt-Hammer. The Schmidt-Hammer
was originally introduced by PROCEQ in 1950 for testing
the compressive strength of concrete. For the lack of a
suitable instrument it was adopted by the paper industry
for Roll Hardness Testing. However, over the years the Schmidt-Hammer has
been found to be less reliable in its adopted role than
originally thought. Consequently PROCEQ has upgraded the
Schmidt-Hammer technology for the exclusive use in the
web processing industries, resulting in the PAROtester2.
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