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This monitor uses simultaneous surface reflectance and electrical resistance measurements to determine the paste solvent content in screened ceramic sheets used in a multilayer ceramic substrate.
English (United States)
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Screened Ceramic Sheet Dryness Monitor
This monitor uses simultaneous surface reflectance and electrical resistance
measurements to determine the paste solvent content in screened ceramic
sheets used in a multilayer ceramic substrate.
It has been experimentally determined that for screened sheets with a similar
paste weight loss, different electrical resistance values will be obtained,
depending on the temperature at which the sheets were dried. It has also been
experimentally determined that for screened sheets with similar paste weight
losses, different surface reflectance values will be obtained, also depending on
the temperature at which the sheets were dried. Therefore, the combined usage
of both resistance and surface reflectivity is necessary to obtain an accurate
indication of solvent content in a screened sheet.
In this apparatus, and related technique, a screened ceramic sheet 10 is
supported on tray 12 on a mechanism 14 which raises and lowers the sheet to
present the sheet for examination by reflectance sensor 16 and DC conductivity
probe 18. Sensor 16 provides an indication of surface reflectivity at 400 to 700
nm wavelength. The outputs from sensor 16 and probe 18 are processed by
instrumentation 17 and 19 and are monitored by electronic comparators 20 and
22, respectively. If the signals are less than the threshhold values, determined
experimentally, the comparators trip a relay 24, indicating that the sheet meets
an acceptable standard for solvent...