Making Ghost Images Disappear
Making Ghost Images Disappear
Reclaiming screens are usually outlined in three steps. The third step, called de-hazing, is an optional process. It is not necessary to de-haze screens after every printing job. Most de-hazer brands contain acids and caustic substances which can destroy the mesh and quality of the screens. De-hazing is done only when the ghost images - faint outlines of previous stencils - have grown prominent to the point of interfering with the current stencil.
It is imperative that you remove excess ink and emulsion from the screen before attempting to de-haze. Read the instructions on the label of your de-hazer and follow it carefully. Wear protective gears like gloves and goggles before de-hazing. Remember that de-hazing acids are strong enough to sting and burn human skin. De-hazing is divided in several steps: Identify the extent of the ghost image, application, and removal. Avoid pouring de-hazer all over your screen and identify the areas that need de-hazing. Pour the de-hazer in a separate container and apply only to "ghostly" areas using a special applicator, or polyester brush. Apply only small measures of the de-hazer as the acids in it make screens discolored and brittle. Rub the screen lightly with the de-hazer using circular motions to ensure even application.
To rinse the screen, flood it with running water from a hose or pour steady streams of water over it. Rub it with another brush while rinsing to remove the de-hazer residue. The residue can eat into the screen and the mesh so be sure to rinse it all out. Applying a grease remover after drying the screen is an option but not necessary. De-hazing can remove oils from the screen. To avoid having to de-haze frequently, follow each printing job with thorough cleaning especially if dark inks are used. Haze prevention is better for your screens than regular de-hazing.
Making Ghost Images Disappear