Press Load Distribution

Non-uniform nip loads often lead to many problems, like sheet profile deviations and poor machine runnabillity. Nip load irregularities can cause costly replacements of felts and roll covers.

The picture underneath shows a paper sheet with a irregular moisture (and caliper) profile, caused by a press with crowning issues.

Paper sheet with a poor moisture profile

Feltest Products to check the press load of Paper Machines

Feltest Carbon Paper

Carbon Paper determines the static nip width between two rolls. The Carbon Paper changes color after closing the nip shortly, leaving behind a “footprint” of the nip (width). It is an economical solution for determining proper crowns, roll parallelism and alignment, and symmetrical loading.

Fuji Pressure Sensitive Film

The pressure sensitive film from Fuji gives more information than just the "footprint"; it also quantifies the local press load. The higher the load, the more intense the film will color. This is very nice shown in this picture of a suction roll.

Advanced Analysis of Fuji Film

The exact interpretation of the Fuji Film can also be automated by a scanner and dedicated optical software. This analysis instrument reads and interprets nip width and nip pressure data automatically. The result is an easy to use chart, containing both the nip width and the load.

Working close to running paper machines is potentially dangerous and requires alertness, concentration and common sense. The products of Feltest Equipment BV are designed and constructed to be as safe as possible for their intended use. Nevertheless it is the user's responsibility to actually use the products in a safe way. Feltest Equipment bv cannot be held responsible or liable in any way for suffered injuries or damages that occurred while using their products.