DRIPPING FROM THE UNDERSIDE ALONG THE FULL LENGTH OF THE CHAMBER
While to the inexperienced eye, this dripping may appear to be caused by an incorrectly positioned doctor blade chamber, it is actually a consequence of back doctoring. In this situation, the rotation of the anilox printing roller is as follows: after touching the plate, the anilox roller touches the containment blade at the bottom as it enters the chamber, and touches the doctor blade as it leaves the chamber.

WHAT CAUSES THIS?
This occurs because the containment blade acts as a negative doctor blade, carrying a small quantity of ink out of the chamber. Due to the very small quantities involved, this ink often solidifies before it can drip. This phenomenon is easily identifiable if, after a print job, you find small ‘icicles’ of dried ink under the doctor blade chamber.

DRIPPING FROM UPPER PART OF LATERAL SEALS
While to the inexperienced eye, this dripping may seem to be the usual result of lost chamber pressure, it is actually a consequence of back doctoring. In this situation, the rotation of the anilox printing roller is as follows: after touching the plate, the anilox roller touches the containment blade at the top as it enters the chamber, and touches the doctor blade as it leaves the chamber. What causes this? This occurs because the containment blade acts as a negative doctor blade, carrying a small quantity of ink out of the chamber. This ink runs along the entire length of the blade to then drop by gravity from the lateral seals.