Jimek International Ab

Sten Hultberg

Birger Hansson

The invention relates to a method for removing printing ink from guide rollers in a printing press. As a paper web moves along its normal path through the printing press while printing is suspended, a printing ink solvent is sprayed onto the paper web, either upstream or downstream of a printing machine. The printing ink deposits on the rollers are dissolved by the solvent as the sprayed paper web passes over the rollers, and the dissolved printing ink is then wiped from the rollers with a nonsprayed part of the paper web. In accordance with one preferred embodiment, the solvent is sprayed onto the paper web in one or more sinusoidal paths and the guide rollers are subsequently braked, preferably to a complete stop and preferably pulse-wise when the sprayed part of the web and the wiping part of the web passes over the rollers. The duration of the pulses is adapted to the desired cleaning effect.

Method and arrangement for cleaning guide rollers

A pulsed spray dampener system wherein, during low press speeds, nozzles are controlled to release pulses of dampening fluid having a fixed pulse width and fluid output is adjusted by varying the interval between dampener pulses. During high speed operation, the interval between pulses is fixed and pulse width is varied. Furthermore, the outermost nozzles of a spray bar are operated by dedicated control channels to permit better spray patterns.

Control method and apparatus for spray dampener

A sprayer assembly comprises a nozzle section and a valve section. The nozzle section includes a valve housing having a valve element at its front end defining a spray outlet, and a valve seat inserted into its rear end. The valve section includes a plunger reciprocably mounted in a solenoid, and a valve stem mounted coaxially in a front end of the plunger for engaging the valve seat. The valve stem can be replaced by removing the valve section and pulling the stem out of the plunger.

Growing community of inventors

Loddekoping, Sweden

Sten Hultberg