Pressure Correction
Localized adjustments to the pressure of a die are made by adding thin layers of material behind the tool or the counter. In the finishing process, impression depth patching is the manual technique used to fix uneven areas where the die is not hitting the board hard enough. Operators apply small pieces of specialized paper or adhesive tape to the back of the die to increase the thickness in specific spots.
This forces the die to sink deeper into the substrate in those areas.
Make Ready Process
Skilled technicians perform this task during the setup phase to ensure the finished effect is uniform across the entire sheet. They look for areas where the foil has not transferred or the embossing is shallow. By building up the low spots, they create a level impression despite small variations in the die height or the press bed.
This stage is time consuming but essential for high quality work.
Image Uniformity
Fine details and large solid areas require different amounts of pressure to look correct. Without impression depth patching, the edges of a design might be over compressed while the center remains faint. The thickness of the patching material is measured in microns to allow for very fine control of the result.
It is the final step in calibrating the press for a specific job.
