Caliper Profiler
The Feltest Caliper Profiler measures the caliper, or thickness of forming fabrics and press felts on the fly.
Caliper values help to estimate the remaining life of forming fabrics. For poorly dewatering press felts, the caliper helps to differentiate compaction, contamination and wear.
With every nip pass, a felt’s ability to recover from the nip impact decreases. Depending on felt design and press load, the felt becomes increasingly compacted. Establish a typical compaction curve for every felt position; this is your reference. Compare the compaction curve of any (trial) felt with this reference and you know precisely what is going on.
A thin felt doesn’t necessarily means it is compacted; it can be worn too. To properly assess the condition of press felts it is best to combine the caliper test results with information on the felt’s openness as measured with the Feltest Airspeed Sensor and Feltest RealVac.
Due to the profile function you will always detect the minimum caliper within 30 cm/1 ft from the edges. This measured caliper can then be related directly to the minimum caliper as stated by the fabric supplier.
The ergonomic and rigid design is equally suitable for left and right handed people. The red trigger has two functions: pulling the trigger opens the mouth of the instrument; pushing the trigger starts recording the measured values into memory. After the measurement you can read the results safely outside the fabric’s run.
The Feltest Caliper Profiler has been designed for use in the corrosive environment of paper mills. It withstands spray-water, dust and mechanical shocks and is practically maintenance-free. The Caliper Profiler is shipped in a custom carrying case; the delivery includes a manual with calculation examples, a USB cable and software to download the data to your PC.
The Caliper Profiler measures the true fabric caliper, not influenced by a water film or small contaminations on the fabric’s surface. The unique shape of the feelers is designed for the best performance on running forming fabrics and press felts. The high spring load gives an excellent reproducibility and makes the results highly independent from the person performing the measurement.
Tip! Also read this related whitepaper:
| Correct felt permeability: how open do press felts need to be? |
Or watch this related Webinar:
“Accuracy, reproducibility and reliability in a paper mill environment, these were the design objectives. A highly dedicated instrument for any professional dealing with paper machine clothing”
| Specifications | Caliper Profiler |
|---|---|
| Accuracy and units | ± 0.01 mm | ± 0.40 mil |
| Dimensions (l x h x d) | 431 x 127 x 25 mm | 17.0 x 5.0 x 1.0 in |
| Weight / including carrying case | 1.8 / 4.8 kg | 4.0 / 10.6 lb |
| Battery | Standard disposable 9V battery |
| Typical battery life | > 1 year |
| Protection | IP 64 |
| PC connection | USB - cable included |
| Software requirement | Windows XP or higher |
| Languages software | English & German |
MEASURE PRESS FELT PERMEABILITY ON THE FLY
Permeability is key to understanding your felt’s condition. The Feltest AirSpeed Sensor helps you better plan your machine downtime, use the right amount of felt cleaning agents, and troubleshoot any performance problems.
CHECKING THE VACUUM AT THE UHLE BOXES
Easily compare the vacuum on both tender and drive side of the paper machine. Find a discrepancy? Take away the cause (contamination inside the Uhle box, piping lay-out or valve dislocation) and use the RealVac to confirm your fix was successful.
MEASURE WHAT MATTERS: SURFACE SPEED
The TrueSpeed Sensor is the fastest way to check the actual surface speed of your rolls and machine clothing – helping you easily identify speed differences caused by input errors and slipping drive rolls.
