Fujifilm for Nip Impressions
DETAILED NIP LOAD INFORMATION
Fuji Pressure Sensitive Film is most commonly used to detect non-uniform load distribution in the press section, the size press and the calendar. Other applications are for example checking the winding quality of the re-winder and gaskets of the steam and condensate system.
Non-uniform nips usually lead to wrinkles, web breaks and poor sheet profiles. These are all costly problems that can ruin the machine’s runnability and yield.
With Fuji Pressure Sensitive Film it is easy detect uneven loads, incorrect crowning, misalignment and damaged or defective roll covers.
The coated sides of both transfer sheets (with the matte finish) must face each other. When pressure is applied, the microcapsules are broken and the color-forming material transfers to the color-developing material and chemically reacts, generating a red color.
The higher the pressure, the more capsules will burst and the more intense the color will be.
Feltest supplies Fuji Pressure Sensitive Film in all sensitivities (see underneath), but two types are most commonly used for paper machine press nips:
For soft nips with one rubber covered press roll: Fuji Film LLW
For hard nips, like steel-on-steel or steel-on-stone: Fuji Film LW
Both types can be easily ordered in our Online Store. More information in this article “How to determine the right Fuji Film type”.
“Thanks to the easy to interpret changes in color intensity we found some defects in the rubber roll cover.”
