کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5005197 | 1369013 | 2010 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Improving integrity of on-line grammage measurement with traceable basic calibration Improving integrity of on-line grammage measurement with traceable basic calibration](/preview/png/5005197.png)
The automatic control of grammage (basis weight) in paper and board production is based upon on-line grammage measurement. Furthermore, the automatic control of other quality variables such as moisture, ash content and coat weight, may rely on the grammage measurement. The integrity of Kr-85 based on-line grammage measurement systems was studied, by performing basic calibrations with traceably calibrated plastic reference standards. The calibrations were performed according to the EN ISO/IEC 17025 standard, which is a requirement for calibration laboratories. The observed relative measurement errors were 3.3% in the first time calibrations at the 95% confidence level. With the traceable basic calibration method, however, these errors can be reduced to under 0.5%, thus improving the integrity of on-line grammage measurements. Also a standardised algorithm, based on the experience from the performed calibrations, is proposed to ease the adjustment of the different grammage measurement systems. The calibration technique can basically be applied to all β-radiation based grammage measurements.
Journal: ISA Transactions - Volume 49, Issue 3, July 2010, Pages 257-263