Carbon Paper
AFFORDABLE NIP WIDTH IMPRESSIONS
Quickly find errors in individual rolls or the entire press system with Feltest Carbon Paper for nip impressions. The Carbon Paper changes color if the threshold for the desired condition is exceeded.
Easily measure the nip ‘footprint’
Non-uniform nips usually lead to wrinkles, web breaks and poor sheet profiles. Feltest Carbon Paper easily determines the static nip width between two mating rolls, helping you to identify nip deviations like:
Uneven load
Incorrect crowning
Misalignment
How it works
Feltest’s carbon paper is a thin color changing pressure activated paper. The paper immediately changes color upon the application of pressure, enabling the user to easily analyze/measure the nip ‘footprint’ (nip width) both visually or, for more intense scrutiny, with a ruler or micrometer.
Quickly check the nip width
Identify misalignment, non-symmetrical load and crowning issues
Use it in the press section, the size press, calendar rolls...
How to Carbon Paper for Nip Impressions
Cut to size. For the best analysis it is advised to use a strip over the full length of the nip.
Prepare for use. If the surroundings are very wet, pack the Carbon Paper in plastic foil. Then place it on one of the rolls with some tape.
Close and open the nip. When the minimum pressure is reached, the Carbon Paper turns dark.
Take it out and analyze the nip width.