Conditioning and remoistening in web offset

The task

Securing quality and efficiency in printing and processing

Paper loses its moisture when subjected to high temperatures. It shrinks, becomes brittle, curls and tends to become electrostatically charged. The possible consequence: Web breaks or paper jams, interference with the shingle stream, in the stacker and with further processing, the fold breaks open, staples drop out, waviness and warping in the spine. The task requires compensating the moisture loss after the drying process.

Moisture supply

Moisture withdrawn from the paper during drying should be restored to it. The objective: Optimal shingle stream, flawless stack formation in the stacker, troublefree stacking, clean break, flatness and stable dimensions of the paper.

The solution

Remoistening through precisely metered liquid application

WEKO-Fluid-Application-System (WFA) such as WEKO-RFS  condition the paper. Micro-droplets are applied to pressing-in rollers supplying moisture to the paper from both sides. The precise moisture supply restores the original running and stacking properties as well as exact flatness to the paper. The result can be seen in troublefree production runs, less paper waste and markedly improved product quality.

The realisation

Web offset needs WEKO-RFS

The modular design of the WEKO-RFS allows integrating the application units without problems in the chill roller frame of heatset rotary printing presses even subsequently. Additional space is not required. The system is especially suitable for high machine speeds.

Your benefits

  • Precisely defined reproducible application quantity
  • Economic consumption of application medium
  • Low energy consumption
  • User-friendly
  • Exact damping water supply at top machine speeds
  • High availability and long-term consistency
  • Quick and easy cleaning