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Table of Contents
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Summary of Contents for Feltest Caliper Profiler
- Page 1 Feltest Caliper Profiler Instruction Manual...
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Page 2: Table Of Contents
4.3 Working principle 5. Measuring 5.1 Finding a good position 5.2 Measuring procedure 5.3 Feltest Caliper Profiler memory navigation 5.4 Feltest Caliper Profiler PC communication 6. Interpretation of the results on forming fabrics 7. Interpretation of the results on press felts 7.1 Judging the condition of a felt... -
Page 3: Declaration Of Conformity
2. Declaration of conformity The product “Feltest Caliper Profiler” is conform to the following directive: 89/336/EEC of 03.05.1989, EMC directive The following Generic Standards have been used to show compliance with this EMC Directive: a) Emission : NEN-EN 50081-1 January 1994... -
Page 4: Safety Instructions
3. Safety instructions 3.1 Intended use The Feltest Caliper Profiler is intended only to measure the caliper of forming fabrics and press felts on running paper machines and is not intended, nor suitable to be used on any other object nor for any other application. -
Page 5: About The Instrument
Nevertheless, it is the user's responsibility to actually use the instruments in a safe way. Feltest Equipment B.V. cannot be held responsible or liable in any way for suffered injuries or damages that occurred while using their instruments. -
Page 6: Names Of Parts
4.1 Names of parts 1. Anvil 6. Pushbutton (min, max, avg) 2. Probe push for the statistical functions. 3. Pushbutton (del pos, p+) 7. Pushbutton (ⱷ, set zero) push short -> higher memory position push short to turn the instrument on/off push long to delete the current push long to set zero memory position... -
Page 7: Working Principle
4.3 Working principle The working principle is as follows: a variable resistor is mechanically connected with the upper probe. Opening the mouth gives a change in the electric resistance, which is transformed into mils (1/1000 of an inch) or millimeters and shown on the display. The sampling rate can be set between 5-25 times per second. -
Page 8: Measuring Procedure
Press felts only: The caliper must be measured within the sheet's run, preferably close after the press nip, before any showers or felt conditioning (see chapter: Interpretation of the results). 5.2 Measuring procedure Note: For press felts the measurement is only of value when the felt has been running for at least 1 hour under a steady press load! 1. -
Page 9: Feltest Caliper Profiler Memory Navigation
(min, max, avg) several times. Pressing the button once more will show the current value again. 9. Pressing the (ⱷ, set zero) button shortly will turn off the instrument. 5.3 Feltest Caliper Profiler memory navigation Every time a recording is started, automatically a new memory position is created. -
Page 10: Feltest Caliper Profiler Pc Communication
5.4 Feltest Caliper Profiler PC communication To capture the measured data from a Caliper Profiler to a computer, or to chance its settings, you first have to install the application Feltest Service (FS) from included CD-ROM. -
Page 11: Interpretation Of The Results On Forming Fabrics
6. Interpretation of the results on forming fabrics The high accuracy of Feltest Caliper Profilers has the advantage that even small dynamic changes in the forming fabric can be measured. For example, due to high fabric tension the caliper can decrease up to 0.04 mm in SSB fabrics. -
Page 12: Interpretation Of The Results On Press Felts
7. Interpretation of the results on press felts When the felt goes through the nip, it’s compressed and afterwards it will expand back. During the lifetime of the felt this expansion will decrease and the felt becomes compacted. Compacted felts absorb less water than non-compacted felts. Therefore the caliper of the felt should be judged in conjunction with the felt weight. -
Page 13: Judging The Condition Of A Felt
7.1 Judging the condition of a felt The caliper (h) is measured with the Feltest Caliper Profiler and is therefore known. When the water content is also measured with a felt moisture meter, it can be converted into felt void (v). - Page 14 The actual water content is best measured at the same position as where the caliper was measured. Water from the felt conditioning system can have an influence. Therefore try to measure right after the nip and certainly before the felt conditioning.
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Page 15: Sources Of Error
Note: To establish representative values for the re-wetting factor compare the actual weight from lab reports which are made later to the calculated F current 7.2 Sources of error • wrong felt weight is being used, due to wrong data or because the felt has lost weight. -
Page 16: Accuracy And Calibration
Feltest Equipment BV for service and re-calibration. Please add a problem description in English or German language and send it properly packed and insured to Feltest Equipment BV. The actual address can be found on www.feltest.com. -
Page 17: Appendix A Felt Compaction Table For Felt "New Weights
Appendix-A Felt compaction table felt “new weights” 900 – 1350 g/m (1/2) 1000 1050 1100 1150 1200 1250 1300 1350 caliper comp. st.cap. comp. st.cap. comp. st.cap. comp. st.cap. comp. st.cap. comp. st.cap. comp. st.cap. comp. st.cap. comp. st.cap. comp. st.cap. - Page 18 Appendix-A Felt compaction table felt “new weights” 1150-1600 g/m (2/2) cali- 1150 1200 1250 1300 1350 1400 1450 1500 1550 1600 comp. comp. comp. comp. comp. comp. comp. comp. comp. comp. cap. cap. cap. cap. cap. cap. cap. cap. cap. cap.
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Page 19: Appendix B Felt Compaction Curves High-Speed Machines
Appendix-B Compaction% vs Life days Yankee 1st VN press, bottom Suction pick up 2nd VN press 3rd / 4th VN press day’s life Appendix-C Compaction% vs Life days Yankee pick up felts (tissue) day’s life...
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