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Liner Wall Movement and Vacuum
Measured by Data Acquisition |
| A method of measuring and characterizing liner
wall movement is presented. The opening and closing of the liner
is much faster than the opening and closing vacuum phases of the
teat cup chamber. The opening of the liner was 3.8 times longer
than closure time. The ‘D’ phase of the liner was
43% longer than the ‘d’ phase of the chamber vacuum
during milking. Thus, the liner is closed for a longer period
than may have been previously assumed from interpreting the typical
waveform of pulsators. Liner ratio during milking was 58.2:41.8
with a chamber vacuum ratio of 64.5:35.5.The liner position is
related to the vacuum conditions of the pulse chamber; however,
the waveform of the pulsator does not correspond to the liner
position. The use of data acquisition and laser technology more
precisely measures liner wall movement and position than do previous
methods. This technology can be used to improve liner, shell,
and vacuum parameters to enhance machine milking performance.
Pulsators might be designed to control the rate of liner wall
movement for optimum milking performance. Liner design may also
be improved when liner movement characteristics can be quantified.
Determination of the TPPD and CCPD of the liner can be measured
dynamically. Duration of the compressive load on the teat is a
possible parameter needing further research. In addition, liner
tension in the shell may be optimized by correlations to milking
time. Liner wall movement may be an indicator for the useful life
of liners. |
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